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An investigation is when you gather facts through observation, questioning, or studying.
Related Questions
Which statement about exothermic reactions is true?
The reaction container always feels cold.
The reactants have more heat energy than the products.
O Energy from an outside source is continuously being added.
More heat is given off than is put into the reaction.
Answers
Answer:
The reactants have more heat energy than the products.
Explanation:
The reactants in an exothermic reaction have higher potential heat energy than the products, this is because they release the energy as heat.
Answer:
just took test is the reactants have more heat
Explanation:
What is the volume of the liquid in the graduated cylinder shown below?
Answers
Answer:
27
Explanation:
base on what u have see in the pictorial.
The volume of the liquid in the graduated cylinder shown below is 28 milliliters.
What is a graduated cylinder?The graduated cylinder is also known as the measuring cylinder which is used to measure the volume of the liquids to perform the experiments in the laboratory as the quantity varies of everything for experiments.
The marks written on it show us the amount of liquid filled in the milliliters they can be from 10 milliliters to 50 milliliters made up of glass but sometimes made up of fiber too and the marks give the amount of liquid.
Therefore, the volume of the liquid in the graduated cylinder shown below is 28 milliliters.
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In the electrolysis of fused (molten) silver chloride, the Ag+ ions are: (1) reduced at the negative electrode, (2) reduced at the positive electrode, (3) oxidized at the negative electrode, (4) oxidized at the positive electrode.
Answers
In the electrolysis of fused (molten) silver chloride, the Ag+ ions are: (3) oxidized at the negative electrode.
During electrolysis, the flow of electric current through a molten electrolyte causes chemical reactions to occur. In the case of fused silver chloride (AgCl), the Ag+ ions are present in the molten state. The negative electrode, also known as the cathode, is where reduction occurs, while the positive electrode, or anode, is where oxidation takes place. In this scenario, Ag+ ions from the molten silver chloride are attracted to the negative electrode (cathode) and undergo reduction, forming solid silver (Ag). At the same time, chloride ions (Cl-) migrate towards the positive electrode (anode) and are oxidized, forming chlorine gas (Cl2).
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hclo is a weak acid ( a=4.0×10−8 ) and so the salt naclo acts as a weak base. what is the ph of a solution that is 0.066 m in naclo at 25 °c?
Answers
To find the pH of a 0.066 M NaClO solution, we will use the given information and the formula for the ionization constant (Kb) of its conjugate base (ClO-).
First, we need to find the Kb value for ClO-. Since HClO is a weak acid with an ionization constant (Ka) of 4.0×10⁻⁸, we can use the relationship between Ka, Kb, and Kw (the ion product of water) to find Kb:
Kw = Ka × Kb
Kw = 1.0×10⁻¹⁴ (at 25°C)
Solving for Kb, we get:
Kb = Kw / Ka = (1.0×10⁻¹⁴) / (4.0×10⁻⁸) = 2.5×10⁻⁷
Now, we can use the Kb value to set up an equilibrium expression for the ionization of ClO-:
ClO- + H2O ⇌ HClO + OH-
Let x represent the concentration of OH- ions.
Since the initial concentration of NaClO is 0.066 M, the equilibrium concentrations will be:
ClO- = 0.066 - x
OH- = x
We can now write the equilibrium expression for Kb:
Kb = ([HClO][OH-]) / [ClO-] = (x * x) / (0.066 - x)
Plugging in the Kb value, we have:
2.5×10⁻⁷ = (x²) / (0.066 - x)
Solve for x to find the concentration of OH- ions:
x ≈ 1.63×10⁻⁴ M
Now, we can find the pOH using the formula pOH = -log[OH-]:
pOH ≈ -log(1.63×10⁻⁴) ≈ 3.79
Finally, we can calculate the pH using the relationship between pH and pOH:
pH = 14 - pOH = 14 - 3.79 ≈ 10.21
Thus, the pH of the 0.066 M NaClO solution at 25°C is approximately 10.21.
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please help me quickly
Answers
Answer: 2
Explanation:
Answer:
It is two
Explanation:
If a sound wave refracts, what happens to it? Select all that apply.
It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.
Answers
If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.
What is refraction of sound wave ?An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.
Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.
If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.
Thus, option A, C and D are correct.
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What is the frequency of a red laser that has a wavelength of 676 mn
Answers
The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
Frequency of wavesThe frequency and wavelength of a wave are related by the following equation:
λf = c
Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.
in this case, λ = 676 nm = 6.76 x \(10^{-7\) m
c = 299,792,458 m/s
Making f the subject of the formula:
f = c/λ
= 299,792,458/6.76 x \(10^{-7\)
= 4.43 x \(10^{14\) hertz
In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
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A sample of Zn(s) is reacted with HCl(aq) to form hydrogen gas. The H2 gas bubbles out of aqueous solution and is collected in a 660 mL container at 411 Torr and 25. 0 C. How many grams of zinc reacted?
Answers
The mass of zinc that reacted is 0.480 g.
To determine the mass of zinc that reacted, we need to use the ideal gas law to calculate the number of moles of hydrogen gas produced in the reaction. We can then use the stoichiometry of the balanced chemical equation to find the number of moles of zinc that reacted, and convert that to grams using the molar mass of zinc.
The balanced chemical equation for the reaction of zinc with hydrochloric acid is:
Zn(s) + 2HCl(aq) → \(ZnCl_2(aq) + H_2(g)\)
From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas.
First, we need to calculate the number of moles of hydrogen gas that was produced. We can use the ideal gas law to do this:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
We need to convert the pressure and volume to units that are consistent with the gas constant R, which has units of L·atm/mol·K. The given pressure of 411 Torr is equivalent to 0.541 atm, and the volume of the container is 660 mL, or 0.66 L. The temperature is given as 25.0°C, or 298.2 K.
Plugging in the values, we get:
(0.541 atm) (0.66 L) = n (0.0821 L·atm/mol·K) (298.2 K)
Solving for n, we get:
n = 0.0147 mol \(H_2\)
Since the stoichiometry of the balanced chemical equation tells us that one mole of zinc reacts with one-half mole of hydrogen gas, the number of moles of zinc that reacted is half of the number of moles of hydrogen gas:
n(Zn) = 0.5 × n(\(H_2\)) = 0.00735 mol Zn
Finally, we can convert the moles of zinc to grams using the molar mass of zinc, which is 65.38 g/mol:
m(Zn) = n(Zn) × M(Zn) = 0.00735 mol × 65.38 g/mol = 0.480 g Zn
Therefore, the mass of zinc that reacted is 0.480 g.
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for each acid-base reaction, determine whether the equilibrium favors the starting materials or the products. click on the side of the reaction, which is favored.
Answers
Stronger/stronger weaker/weaker is indeed the reaction that is energetically preferred because acids and bases are conjugates, where the stronger acids is on the same side as that of the stronger base.
Equilibrium inside an acid-base reaction favors what?In acid-base processes, equilibrium is always in the favor of the weaker side.The pKa values for the compounds functioning as acids are displayed beneath their structures in the example below.Because the weaker acid and base are on the left, equilibrium is in the favor of the left.
How is the path of an acid-base balance determined?Finding the pKa for the acid on the left and deducting it from it allows us to utilize our pKa values to anticipate the point of equilibrium.
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Identify from the following list which examples are
controlled experiments.
You make two pitchers of lemonade and
only change the amount of lemonade mix you
add.
only change the amount of water you add.
change both the amount of water and the
amount of lemonade.
DONE
Answers
Answer:
only change the amount of lemonade mix you add.
only change the amount of water you add.
Explanation:
just did this question
The examples of controlled experiments are as follows:
only change the amount of lemonade you add.only change the amount of water you add.Thus, the correct options for this question are B and C.
What is a Controlled experiment?A Controlled experiment may be defined as a type of experiment in which all the variable factors in an experimental group and a juxtaposition control group are held identical except for one variable factor in the experimental group that is significantly altered.
According to this question, the options in which one variable factor is altered should keep in the category of a controlled experiment. It is very easily identified that the alteration or addition of lamonade in one experiment or the only addition of water in another experiment.
Therefore, the correct options for this question are B and C.
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What dose nervous system mean
Answers
Answer:
your brain spinal cord and nerves
When 127.68 g of brass at 163 °C are added to 150.00 g H₂O at 22.4 °C, the final
temperature
for brass.
of the brass and water is 32.6 °C. Calculate the value of the specific heat, c,
Answers
For water: q = cmΔT = 4.18 ∙ 150 (32.6 – 22.4) = 6395.4J
For brass: c = q / mΔT = 6395 / 127.68 (163 – 32.6) = 0.384 J / gC
What is water?
The global economy depends heavily on water. Agriculture uses over 70% of the freshwater that people use. 6.5% of the world's protein comes from fishing in salt and fresh water bodies, which has been and still is an important source of food for many regions of the world. Commodities (including oil, natural gas, and manufactured goods) are frequently transported across vast distances by boats over the oceans, rivers, lakes, and canals. In both industry and residences, huge amounts of water, ice, and steam are utilised for cooling and heating. Water is utilised extensively in industrial processes, as well as in cooking and washing, as it is a great solvent for a wide range of compounds, both mineral and organic.To know more about water, click the link given below:
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H2O trong hóa học là gì? Ngoài đời là gì?
Answers
Answer:
Ký hiệu hóa học (xem thêm ký hiệu) cho nước. Mỗi phân tử nước chứa hai nguyên tử hydro (H) liên kết với một nguyên tử oxy (O).
The chemical symbol (see also symbol) for water. Each molecule of water contains two atoms of hydrogen (H) joined to a single atom of oxygen (O).
Which substance is most likely to dissolve in greater quantities in cold water?
a.Sugar
b.Potassium Chloride
c.Sodium Chloride
d.Oxygen
Answers
The substance that dissolves in large quantities in cold water is sodium Chloride.
Ionic substances are formed when two ions come together to form a crystal lattice. The lattice energy of the substance is dependent on the size of the ions. The smaller the size of the ions the larger the lattice energy.
NaCl has a lower lattice energy compared to its hydration energy hence NaCl dissolves in cold water.
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What is the pH of a solution whose H + concentration is 4.0 10 –9?
Answers
Answer:
he pH of a solution is defined as the negative log10 [H+] ... 1 x 10-11. 11. Acidic Solution. 1 x 10-4. 4. 1 x 10-10. 10. 1 x 10-5. 5. 1 x 10-9.
Explanation:
m
How can you tell by looking at the graph if a substance is solid, liquid, or gas at room temperature?
Answers
What is the cost of coal in dollars per ton if it costs $0.04 per kilogram?
Answers
Answer:
36.2874 $
Explanation:
1 ton = 907.185 kilograms.
907.185 x 0.04 =
36.2874
-kiniwih426
According to unit conversion,cost of coal in dollars per ton if it costs $0.04 per kilogram is 80 dollars per ton.
Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
First, we need to convert the cost per kilogram to dollars per ton. There are 2000 kilograms in a ton. So, the cost per ton is $0.04/kilogram × 2000 kilograms/ton = $80/ton.
So the answer is 80 dollars per ton.
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Dominique goes to the doctor for bone aches. The doctor tells him
that Vitamin D helps his body take in the Calcium for his bones.
Explain why the doctor tells Dominique to do more outdoor activities.
Answers
Answer:
sun gives you vitamin D
Explanation:
Our body creates vitamin D from direct sunlight on our skin when we're outdoors.
how many ML is this ?
Answers
Answer:
It's right below 620. So id say 618 ML
Explanation:
the dead sea, in the middle east, is about 6.20 m of nacl. how many grams of nacl are in 650. ml of sea water?
Answers
The Dead Sea, with a salinity of 6.20 molar NaCl, contains approximately 235.26 grams of NaCl in 650 mL of sea water.
To determine the amount of NaCl (sodium chloride) in 650 mL of Dead Sea water, we first need to calculate the concentration of NaCl in the Dead Sea.
The Dead Sea has a salinity of approximately 6.20 m (molar), which means it contains 6.20 moles of NaCl in 1 liter (1000 mL) of water. We can convert this to moles per milliliter by dividing the molarity by 1000:
6.20 m NaCl / 1000 mL = 0.00620 moles/mL NaCl
Next, we can use the molar mass of NaCl to convert moles to grams. The molar mass of NaCl is approximately 58.44 g/mol (sodium: 22.99 g/mol + chlorine: 35.45 g/mol).
Finally, we can multiply the concentration of NaCl by the volume of sea water to find the mass of NaCl:
0.00620 moles/mL NaCl * 650 mL = 4.03 moles NaCl
4.03 moles NaCl * 58.44 g/mol = 235.26 grams of NaCl
Therefore, there are approximately 235.26 grams of NaCl in 650 mL of Dead Sea water.
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Which type of chemical bond is formed by the attraction between positive ions and surrounding mobile electrons?
A) ionic
B) nonpolar covalent
C) metallic
D) polar covalent
Answers
Answer:
C metallic bond is the answer
how many moles are there in 1.3 x 10^24 atoms of calcium
Answers
Answer:
Number of moles in 6.23 x 10^23 = 1 .So , In 1.3 x 10^24 = 1.3 * 10^24 / 6.23 * 10^23 => 2.2 Moles .Explanation:
Hope this helps you !!answer
n=2.2 mole
explanation
n=N/A
N=1.3×10^24
A=6.022×10^23
\( \frac{1.3 \times {10}^{24} }{6.022 \times {10}^{23} } = 2.2\)
n=2.2 mole
burning coal causes a more severe co2 problem than burning other fossil fuels because
Answers
Burning coal causes a more severe carbon dioxide problem than burning other fossil fuels because coal contains aromatic hydrocarbons.
Coal contains aromatic hydrocarbons which has high molar mass and has a high ratio of carbon to hydrogen. Burning of coal produces more soot than burning other fossil fuels because of the presence of aromatic hydrocarbons.
Fossil fuel are the mixtures of hydrocarbons that are formed from the dead remains of plants or animals. Burning of fossil fuels increases the amount of carbon dioxide in the atmosphere. This increase usually affects temperatures, amounts of rain and sea levels worldwide.
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Liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. If of water is produced from the reaction of of hexane and of oxygen gas, calculate the percent yield of water. Round your answer to significant figures
Answers
If water is produced from the reaction of hexane and of oxygen gas, then the percent yield of water is 8.6%.
The balanced equation for the reaction between hexane and oxygen to form carbon dioxide and water is:
C₆H₁₄ + 19/2 O₂ → 6CO₂ + 7H₂O
The stoichiometric ratio between hexane and water is 1:7, which means that for every 1 mole of hexane, 7 moles of water are produced.
If 0.30 moles of water are produced from the reaction of 0.50 moles of hexane and excess oxygen gas, then the theoretical yield of water is:
0.50 moles hexane × (7 moles H₂O / 1 mole hexane) = 3.5 moles H₂O
The percent yield of water is calculated by dividing the actual yield of water by the theoretical yield of water and multiplying by 100%:
percent yield =(actual yield/theoretical yield) × 100%
percent yield = (0.30 moles H₂O / 3.5 moles H₂O) × 100%
percent yield = 8.6%
Therefore, the percent yield of water is 8.6%.
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1. The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of the molecule.
Show work please
Answers
Answer:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Explanation:
What is the Law of Conservation of mass?
Answers
Answer: Mass is neither created nor destroyed
Explanation: Mass or matter cannot be created or destroyed even by chemical or physical changes/transformations
is this reaction oxidation or reduction
CH2=CH2 + OsO4 yields to HOCH2CH2OH
Answers
Answer:
it's definitely a oxidation reaction because here the oxygen contained OH group present in yeild
A biologist examines a tree in an orchard. Name three structures the biologist can examine to indicate that it is a tree. Name two characteristics the biologist can examine to indicate it is an apple tree
Tree- made of bark, have annual rings, have trunk, produce oxygen
Answers
Two characteristics that will indicate that it is a tree would be the presence of a trunk and roots.
Two characteristics that will indicate it is an apple tree would be the presence of flowers and apple fruits.
Characteristics of treesStructures to indicate that it is a tree:
Leaves: Trees typically have a branched network of leaves, which are often broad and flat and grow directly from the branches.Roots: Trees have a well-developed root system, which anchors the tree in the ground and absorbs water and nutrients from the soil.Height: Trees are generally tall and have a single main trunk that supports the branches and leaves.Characteristics to indicate it is an apple tree:
Fruit: Apple trees produce apples, which are round, red or green, and typically have a sweet or sour taste.Flowers: In the spring, apple trees produce white or pink flowers, which bloom in clusters and have a distinctive fragrance.More on trees can be found here: https://brainly.com/question/13895881
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Which type of fault is under compression? A. Normal. B. Thrust. C. Transform. D. Strike-slip
Answers
Answer:
The answer is Thrust
HELP PLEASE ASAP a microphone will likely detect the least amount of sound when placed in which container? A. A cardboard box B. A metal canister C. A paper bag D. A plastic foam cooler
Answers
Answer:
its b
Explanation:
i took it and got an a