Which of the following would violate laboratory safety rules? (1 point)
wearing open-toed shoes when chemicals are being used
o wearing gloves when handling chemicals
o tying long hair back when near an open flame
o wearing goggles when lab materials are being used
Answers
Answer:
wearing open toed shoes
Explanation:
this is because you could drop said chemicals and hurt yourself unless you are where some cover on your feet.
The one that would violate laboratory safety rule, wearing open-toed shoes when chemicals are being used. The correct option is A.
What are laboratory safety rules?These basic rules provide information on laboratory behavior, hygiene, and safety to help prevent accidents.
Specific processes, equipment, and materials may necessitate laboratory-specific safety rules, which should be addressed by laboratory-specific SOPs.
Exposure to corrosive and toxic materials, flammable solvents, high pressure gases, explosive chemicals, and dangerous microbes all pose potential hazards in the laboratory.
Laboratory mishaps can be avoided with a little caution and adherence to prescribed safety guidelines.
When it comes down to it, lab safety is the employer's and his or her designees' responsibility. To protect employees, rules and policies may be established.
Wearing open-toed shoes in a laboratory would be a violation of laboratory safety rules.
Thus, the correct option is A.
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Related Questions
If the temperature of a gas inside a flexible container with a volume of 50 liters (L) decreases from 500°C to 100°C what will be the new volume of the container?
40.00L
10.00L
24.13L
103.6L
Answers
If the temperature of a gas inside a flexible container with a volume of 50 liters (L) decreases from 500°C to 100°C, then new volume will be 10L.
What is the relation between volume and temperature?Volume and temperature of the gas is directly proportional to each other and for this question, equation becomes,
V₁/T₁ = V₂/T₂, where
V₁ = initial volume = 50L
T₁ = initial temperature = 500°C
V₂ = final volume = ?
T₂ = final temperature = 100°C
On putting values, we get
V₂ = (50)(100) / (500) = 10L
Hence required volume of gas is 10L.
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44.) An object possesses a density of 2.780 g/mL. If the mass of the object is 0.896 grams, what is the
volume, in of the object in mL?
(A) 0.3223 mL
(B) 3.22 x 10-4 mL
(C) 3.223 x 10-4 mL
(D) 0.322 mL
Answers
An object possesses a density of 2.780 g/mL. and the mass of the object is 0.896 grams, the volume, in of the object in mL is (A) 0.3223 mL
To calculate the volume of an object, we can use the formula:
Volume = Mass / Density
Given that the mass of the object is 0.896 grams and the density is 2.780 g/mL, we can substitute these values into the formula:
Volume = 0.896 g / 2.780 g/mL
By performing the division, we find:
Volume = 0.3223 mL
So, the volume of the object is 0.3223 mL.
Therefore, the correct answer is (A) 0.3223 mL.
It's important to note that the volume is expressed in milliliters (mL) since the density is given in grams per milliliter (g/mL). The calculation involves dividing the mass (in grams) by the density (in g/mL), resulting in the volume in milliliters.
Understanding and applying the formula for calculating volume using mass and density helps us determine the physical space occupied by an object based on its characteristics. Therefore, Option A is correct.
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Indentify the products in the equation below. HCI + NaOH⇾ H₂O + NaCI
Answers
Answer:
The products of the reaction are water (H2O) and sodium chloride (NaCl).
Explanation:
The equation represents a neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) to form water (H2O) and sodium chloride (NaCl).
The products of the reaction are water (H2O) and sodium chloride (NaCl).
Answer:
The products are:
- Water
- Salt
Explanation:
The equation represents the neutralization reaction between a acid and a base to form salt and water
How much of the protein in milligrams you should take to prepare 5.0 milliliters of 0.75 mg/mL solution
Answers
To prepare 5.0 milliliters of 0.75 mg/mL solution, 3.75 milligrams of protein should be taken.
To find out how much protein is needed to prepare a 0.75 mg/mL solution in 5.0 milliliters, we must first understand the concepts of mass and volume as well as the units that measure them. A milligram is a unit of mass in the metric system that is one-thousandth of a gram (10⁻³ g). A milliliter is a unit of volume in the metric system that is one-thousandth of a liter (10⁻³ L). A milligram per milliliter (mg/mL) is a unit of concentration in the metric system that represents the mass of solute per unit volume of solution. In this problem, we are given the volume of the solution that we want to prepare (5.0 mL) and the concentration of the solution that we want to prepare (0.75 mg/mL). We can use the formula for concentration to find the mass of protein that is needed to prepare the solution. The formula for concentration is:
concentration = mass of solute ÷ volume of solution
We can rearrange this formula to solve for the mass of solute:
mass of solute = concentration × volume of solution
Substituting the given values into this formula, we get:
mass of protein = 0.75 mg/mL × 5.0 mL = 3.75 mg
Therefore, 3.75 milligrams of protein should be taken to prepare 5.0 milliliters of 0.75 mg/mL solution.
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pleaseee help ASAP
will mark brainliest!!! <3
Answers
explanation:
Answer:
it is C
Explanation:
I saw from Google. Hope it helps.
I cant get the full picture
sorry
4) The principle of ________ states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past.
A) catastrophism
B) plate tectonics
C) plutonism
D) Uniformitarianism
Answers
The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the
Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.
James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.
This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.
Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.
Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.
In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.
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she decides to repeat the experiment using lower concentrations of lead than those she used initially. what conclusion can the scientist in this scenario make from her results?
Answers
If the scientist repeats the experiment using lower concentrations of lead than those she used initially, she can draw several conclusions based on the results of the experiment.
If she finds that the results are similar or the same as her initial experiment, she can conclude that the effect observed in her initial experiment is likely due to the lead and not a result of chance. This would provide support for her hypothesis that lead is responsible for the observed effect. Additionally, this could also indicate that the effect is likely to be present at a wide range of lead concentrations, and not just at the higher concentrations used in the initial experiment. If the results are different, however, she may conclude that the effect is dependent on the concentration of lead and that lower concentrations have a weaker effect. For example, she may have used different methods for preparing the lead solutions in the repeat experiment which could have led to variations in the final concentrations.
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Describe two carbon sequestering methods that could reduce the impact of deforestation
Answers
The two carbon-sequestering methods that could reduce the impact of deforestation are afforestation and agriculture.
Carbon sequestering
It is a process of capturing and storing the carbon dioxide gas of an atmosphere on a large scale.This is done to prevent adverse global climatic conditionsThe methods which can reduce the impact of deforestation are afforestation, wetlands, fertilizing ocean surfaces, agriculture, etc.Afforestation
Planting trees in the nonforest region or planting trees in the deforested region.By this more and more carbon dioxide gas will be absorbed by the tress from the atmosphere via photosynthesis and that will get involve in the carbon cycle.Help in re-establishing an ecosystem in the region and prevent soil erosion.Agriculture
Growing and planting crops which maintain carbon level of the soil, And along with absorbs carbon dioxide gas from the atmosphere. Will increase the concentration of oxygen gas in the atmosphere leading to prevent air pollution.Learn more about carbon sequestering here:
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why is it called the Solar system?
Answers
Answer:
Because it's a system in the solar areas.
Explanation:
Im just tryna sound smart, I actually have no clue
Answer:
The Latin word for the Sun is Sol, so we call this system the Solar System. He showed that it was very likely that all the planets moved around the Sun. This time even more people thought Galileo may be right and that the Earth really did move around the Sun.
Explanation:
There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call solar.
Hope That Helps :0
Give two differences between the physical properties of the elements in Group 1 and those of the transition elements. [2 marks
Answers
Due to their stronger metallic bonding and more compact atomic structure, the transition elements have higher melting and boiling temperatures and are often denser than the alkali metals.
What are group one metals' two physical characteristics?Elements from Group 1 have similar properties. All of them are supple silver metals. These metals are extremely reactive and have low melting temperatures due to their low ionisation energy. As you descend the chart, this family becomes more reactive.
What are the transitional elements?The d orbitals of transitional elements are only partially filled. A transition element is defined by IUPAC as an element that may form stable cations and has an electron d subshell that is only partly filled.
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Part 1: name two elements that have the same properties as sodium (na). (4 points) part 2: determine the number of protons, electrons, and neutrons present in an atom of calcium (ca). explain how you determined your answer using complete sentences. (6 points)
Answers
Part 1: Two elements with the same properties as Sodium(Na) are Lithium(Li) and Potassium(K).Part 2: Calcium(Ca) has 20 protons, 20 electrons and 20 neutrons.Elements that have the same properties ( physical and chemical ) are usually found on the same group. A group ( also called family ) in chemistry, means a column or a vertical line of elements in the periodic table of elements. Elements in the same group are similar because they have the same number of electrons in their outermost shell. The two most common elements found in the same group as Sodium(Na) are Lithium(Li) and Potassium(K). All three elements are in Group 1, have 1 electron in their outermost shell and are highly electropositive.The number of protons in any atom is always equal to the atomic number of that element, usually denoted by the letter Z. From the periodic table of elements, The atomic number of Calcium(Ca) is 20, so the number of protons will be 20. The number of electrons in any given atom is also equal to the number of protons in that atom, therefore the number of electrons in Calcium(Ca) is also 20. To find the number of neutrons, subtract the number of protons from the atomic mass as; Atomic mass = Number of protons + Number of neutrons Calcium(Ca) has an atomic mass of 40, so it's number of neutrons will be; 40 - 20 = 20 neutrons Hence, Calcium(Ca) has 20 protons, 20 electrons, and 20 neutrons.
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il give brainly and 50 points if u answer my question
Answers
Answer: Whats ur Question?
Explanation:
i am doing a comparison between nano coatings of TiO2 at different temperature, 1st coating is as deposited (room temperature), 2nd is annealed at 300 C and 3rd is annealed at 400 C. The results of UV-visible spectroscopy shows that our bandgap has increased with the change in temperature and that the transmission increases with increase in wavelength. my question is, what does this increase in bandgap show, what are the properties of the annealed TiO2 compared to as deposited TiO2?
What happens when you increase the bandgap? What is the effect due to the increase?
Answers
increase in bandgap of annealed TiO2 compared to as-deposited TiO2 indicates changes in electronic structure,optical properties. Alteration affect material's light absorption, transparency, photocatalytic behavior.
The increase in bandgap observed in the annealed TiO2 compared to the as-deposited TiO2 indicates a change in the electronic structure and optical properties of the material. it is important to note that the bandgap represents the energy difference between the valence band (where electrons are bound) and the conduction band (where electrons are free to move and contribute to electrical conductivity). An increase in the bandgap indicates that more energy is required to excite electrons from the valence band to the conduction band.
When TiO2 is annealed at higher temperatures, the crystal structure and arrangement of atoms undergo changes. This results in modifications to the electronic band structure. Specifically, annealing at higher temperatures promotes the reorganization of atoms and the reduction of defects or impurities in the TiO2 lattice. The increase in bandgap implies that the annealed TiO2 has a higher energy threshold for electron excitation. This suggests that the material has a wider range of light absorption, particularly in the ultraviolet (UV) region. The increased bandgap leads to a shift towards higher energy (shorter wavelength) absorption, which corresponds to a decrease in the material's transparency in the UV range.
Furthermore, the increase in bandgap affects the photocatalytic properties of TiO2. TiO2 is widely used as a photocatalyst for various applications, such as water splitting and pollutant degradation. A larger bandgap means that TiO2 requires higher-energy photons (typically UV light) to initiate photocatalytic reactions. Therefore, the annealed TiO2 with an increased bandgap may exhibit reduced photocatalytic activity compared to the as-deposited TiO2. In summary, the increase in bandgap of the annealed TiO2 compared to the as-deposited TiO2 indicates changes in the electronic structure and optical properties. This alteration can affect the material's light absorption, transparency, and photocatalytic behavior.
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I am a celestial body that does not produce light. I orbit a planet
Answers
an enzyme which catalyzes the oxidation of an alcohol would most likely be accompanied by the coenzyme .
Answers
The presence of a coenzyme like NAD+ or NADP+ is necessary for the efficient catalysis of alcohol oxidation by the enzyme.
An enzyme that catalyzes the oxidation of an alcohol is likely to be accompanied by a coenzyme called NAD+ (nicotinamide adenine dinucleotide) or NADP+ (nicotinamide adenine dinucleotide phosphate).
Coenzymes are non-protein molecules that work alongside enzymes to facilitate enzymatic reactions. In the case of alcohol oxidation, NAD+ or NADP+ serves as a coenzyme that acts as an electron acceptor.
During the oxidation process, the alcohol molecule donates electrons to the coenzyme, which is then reduced to NADH or NADPH. This reduction reaction allows the enzyme to carry out the oxidation reaction efficiently.
The role of NAD+ or NADP+ as a coenzyme is crucial in alcohol oxidation, as it helps in the transfer of electrons and participates in the overall redox reaction.
The reduced form of the coenzyme (NADH or NADPH) can then go on to donate the electrons to other metabolic pathways or serve as a reducing agent in cellular processes. Overall, the presence of a coenzyme like NAD+ or NADP+ is necessary for the efficient catalysis of alcohol oxidation by the enzyme.
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bserve: two families of chemicals are acids and bases. acids and bases can be detected by an indicator, which is a substance that changes color in the presence of an acid or a base. phenol red is an indicator that is yellow in an acid, orange in a neutral solution, and pink in a base. click reset. drag the phenol red next to the flask of water. what does the indicator show? click play, and wait for the reaction to end. what does the indicator show now?
Answers
1. It shows that the acid is like a solid chemical that shows acid and base. So that the solution created is neutral. If acid would have not shown then the solution would have been basic.
2. The water was displaced out of the test tube because gas bubbles were being produced and without displacement of water the production of bubbles is not possible.
When mixed acids and bases neutralize each other to form salts, substances with a salty taste do not have the characteristics of acids or bases. Phenolphthalein is used as an indicator in acid-base titration. It is colorless in acidic solutions and pink in basic solutions.
Litmus is one of the most commonly used natural indicators for distinguishing between acids and bases in the laboratory. Litmus is a naturally occurring indicator. Litmus solution is a purple dye obtained from lichen a plant of the taro plant family. Litmus turns purple when mixed with a neutral solution.
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How many grams of 40% pure FeO can produce 5. 6g Fe according to given equation (At. Wt. Of Fe = 56)
FeO + CO = Fe + CO2
Answers
So, 72 g of FeO gives 56 g of Fe.
To produce 5.6 g of Fe, you need (5.6/56) * 72 = 7.2 g of pure FeO.
But the FeO you have is only 40% pure. So, you need 7.2 / 0.40 = 18 g of the 40% pure FeO to produce 5.6 g of Fe.
You welcome!
In one to two sentences, describe an experiment that would show that intramolecular forces (attractions between atoms within molecules) are stronger than intermolecular forces (attractions between molecules)
Answers
In order to demonstrate that intramolecular forces are stronger than intermolecular forces, a block of ice will be heated in a sealed container until it turns into steam.
Why do intramolecular forces outweigh intermolecular forces?
Because the forces holding together compounds are stronger than the forces holding together molecules, intramolecular forces are stronger than intermolecular forces.
Intermolecular forces exist between molecules, but intramolecular forces exist between atoms within a molecule. This is the primary distinction between intermolecular and intramolecular forces.
Look for the molecule with the most polarity, the most electronegative atoms, or the most hydrogen bonding groups if the molecules have identical molar weights and similar intermolecular forces. That one will have the overall stronger IMFs.
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ILL GIVE YOU BRAIN LIEST IF YOU KNOW THE ANSWERS
Answers
Answer:B & C
tell me if im wrong
Answer:
Q 3 c it will reduce rate of photosynthesis in plants that live in the bottom of the lake
Q4 d the atom are in same group
This is right answer because these two elements are Lithium and neon Lithium is present in first group and Neon in last or group 18
Explanation:
Electromagnetic radiation emitted from a hot object reaches it's peak at a wavelength of 8.5 x 10-7 m. What is the frequency of this radiation
Answers
Answer:
the frequency is 18
Explanation:
please mark me as the branlest hope it helps please
Determine the empirical and molecular formula for a compound containing 26.1
% carbon, 4.3% hydrogen, and 69.6% oxygen. Molar Mass = 138 g/mol.
Answers
determing that the compoumd formed is in 100%
therefore, 26.1 +4.3+69.6 = 100%
hence no need of adding O molecule
finding the numbr of moles of each element
no. of moles of C= given mass÷molar mass
=26.1÷12
=2.1 mol
no. of moles of H = given mass÷molar mass
=4.3÷1
=4.3 mol
no of moles of O =given mass÷molar mass
=69.6÷16
=4.3
the simplest whole nber of the element in the unknown compoumd is 1:2:2 of C:H:O
HENCE, the empirical formula is CH2O2
empirical formula mass of CH2O2 IS
=(12)+(2×1)+(16×2)
12+2+32
46 G/MOL
N= molar mass of the compoumd ÷ emporical mass of the compoumd
N= 138÷46
N=3
molecular formula =N×empirical formula
=3 ×CH2O2
C3H6O6 is the molecular formula
(tartonic acid)
hope it helped u!
What is the main function of commission?.
Answers
The major duty of India's Election Commission is to supervise impartial elections across the whole country. The Indian Election Commission is the Direct Superintendent.
The elections for the President and Vice President of India, as well as the legislatures and parliaments of each State, are under its supervision. Vote counting is the Election Commission's most important job during an election. Each of the State Election Commissioners is independent of the Indian Election Commission and is in charge of a certain task. To oversee the holding of elections for Panchayati Raj institutions, a State Election Commissioner must be chosen by the State government.
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What is created by the fusion of three helium nuclei?
- nitrogen
- iron
- oxygen
- carbon
- hydrogen
Answers
Answer:
carbon nuclei...........
As the pressure of an enclosed gas decreases to half its original value, what happens to the volume of the gas if the temperature is held constant?
Answers
Answer:
At this point the volume of the gas is halved. If the pressure on the piston is again doubled, the volume of gas decreases to one-fourth its original volume. FIGURE 9.8 Boyle's Law: At constant temperature, the volume of a gas sample is inversely proportional to the pressure.
The volume of the gas doubles.
Boyles law state that the pressure of a gas is indirectly proportional to the volume at constant temperature. It is given by:
PV = constant
Let us assume that initially the pressure is P and the volume is V, hence:
\(P_1=P,V_1=V\)
The volume decreases to half its original value, hence:
\(P_2=\frac{P}{2}\)
Therefore:
\(P_1V_1=P_2V_2\\\\\\PV=\frac{P}{2}V_2\\\\V_2=2V\)
Therefore the volume of the gas doubles.
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Place the steps involved in reduction of an alkyne to a trans alkene in the correct order, starting with the first step at the top of the list.
Answers
The reduction of an alkyne to a trans alkene involves several steps. The correct order of these steps, starting from the top, is as follows:
Addition of hydrogen gas (H2) in the presence of a metal catalyst.
Formation of a cis-alkene intermediate.
Isomerization of the cis-alkene to a trans-alkene.
Removal of the metal catalyst and purification of the trans-alkene product.
The reduction of an alkyne to a trans alkene proceeds through a series of chemical reactions. The first step involves the addition of hydrogen gas (H2) in the presence of a metal catalyst, such as palladium (Pd) or platinum (Pt). The metal catalyst facilitates the breaking of the triple bond in the alkyne, resulting in the formation of a cis-alkene intermediate.
In the next step, the cis-alkene undergoes isomerization, converting it into a trans-alkene. This isomerization occurs through a rearrangement of the carbon-carbon double bond. The exact mechanism of this isomerization may vary depending on the reaction conditions and the specific alkynes involved.
After the desired trans-alkene is formed, the next step involves the removal of the metal catalyst. This can be achieved through various methods, such as filtration or extraction. The purified trans-alkene product is then obtained and can be further used in various chemical reactions or applications.
In summary, the reduction of an alkyne to a trans alkene involves four key steps: addition of hydrogen gas in the presence of a metal catalyst, formation of a cis-alkene intermediate, isomerization of the cis-alkene to a trans-alkene, and removal of the metal catalyst followed by purification of the trans-alkene product.
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Chemically speaking, how does applying hot dog mustard to a coin detect the presence of silver metal
Answers
Answer:
A black spot will remain on the silver coin, but not on the nonsilver coin. Mustard naturally contains sulfur compounds, and sul- fur reacts with silver to form a black precipi- tate of silver sulfide (Ag2S)
Explanation:
what is the general principle of solubility?
Answers
Answer:
The short general principle of solubility states that "like dissolves like." Solvents that have similar polarity or charge to the solute tend to dissolve it more readily.
Solubility is the ability of a substance to dissolve based on chemical nature, intermolecular forces, and "like dissolves like" principle. Factors like particle size, temperature, and pressure affect solubility. It is expressed as the maximum amount of solute that can dissolve in a solvent.
Which commercial technology commonly uses plasmas?
a radio
a race car
a television
a microwave oven
Answers
The correct answer is C. A television
Explanation:
Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.
Answer:
c
Explanation:
edge
A sample of gas at 240K and 670 mmHg occupies a 1.28L volume. What volume (in Liters) will the gas occupy at 198K if the pressure is changed to 680 mmHg?
Answers
Answer:
1.04 L.
Explanation:
What is given?
Temperature 1 (T1) = 240 K.
Pressure 1 (P1) = 670 mmHg.
Volume 1 (V1) = 1.28 L.
Temperature 2 (T2) = 198 K.
Pressure 2 (P2) = 680 mmHg.
What do we need? Volume 2 (V2).
Step-by-step solution:
To solve this problem, we have to use the combined gas law. The combined gas law expresses the relationship between the pressure, volume, and absolute temperature of a fixed amount of gas. For a combined gas law problem, only the amount of gas is held constant. The formula of combined gas law is:
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}.\)We need to find the volume 2 (V2), so let's solve for this unknown value and let's replace the given data that we have:
\(\begin{gathered} V_2=\frac{P_1V_1T_2}{T_1P_2}, \\ V_2=\frac{670\text{ mmHg}\cdot1.28\text{ L}\cdot198K}{240K\cdot680\text{ }mmHg}, \\ V_2=1.04\text{ L.} \end{gathered}\)The final volume for this case would be 1.04 L, the volume is being reduced.
A sodium atom has 11 protons, 10 electrons, and 12 neutrons. What is its charge
Answers
Answer:
An ion with 11 protons, 11 neutrons, and 10 electrons would have a charge of 1+, also expressed as a charge of positive one or +1.