Answers
Answer:
1.5 eq. of charge are present.
Explanation:
In therms of charge, 1 equivalent of charge is defined as the moles of a monovalent ion (That is of charge +1 or -1) necessaries to neutralize the charge of the ion that we are studying.
In PO₄³⁻ ion there are 3 equivalents of charge per mole of PO₄³⁻. In 0.5 moles of this ion there are:
0.5 moles PO₄³⁻ * (3Eq. / 1 mol PO₄³⁻) =
1.5 eq. of charge are present.Related Questions
How are lysosomes and vacuoles the same? How are
they different?
Answers
Answer:
This is the answer they're looking for:
Lysosomes and vacuoles both deal with waste materials. Lysosomes break down waste materials, and vacuoles store waste materials in the cell temporarily before the cell get rids of them.
Explanation:
i hope you'll pick me for brainiest
Calculate the concentration of CO32− , H3O+ , and OH− in a 0.155 M M solution of H2CO3 . ( Ka1=4.3×10−7 and Ka2=5.6×10−11 .)
Answers
H
2
C
O
3
⇌
H
+
+
H
C
O
3
−
K
a
1
=
4.2
×
10
−
7
H
C
O
3
−
⇌
H
+
+
C
O
3
2
−
K
a
2
=
4.8
×
10
−
11
First, we will use the first dissociation constant to find the concentration of
H
C
O
3
−
.
K
a
1
=
[
H
+
]
[
H
C
O
3
−
]
[
H
2
C
O
3
]
[
H
+
]
=
[
H
C
O
3
−
]
4.2
×
10
−
7
=
[
H
+
]
[
H
+
]
0.035
[
H
+
]
2
=
1.47
×
10
−
8
[
H
+
]
=
1.21
×
10
−
4
M
Now, we will use the second dissociation constant to find the concentration of
C
O
3
2
−
:
A science teacher is planning a science lab in which students will identify conditions that do and do not speed up the time required for
sugar to dissolve in water. Which of the following conditions will NOT have an effect on the dissolving time?
B. stirring the water
D. magnetizing the sugar
E grinding the sugar
of heating the water
Answers
Answer: E
Explanation:
what ore is turned to finished aluminum
Answers
C6H12O6 + 602 → 6CO2 + 6H₂O
The most efficient ratio is
1 C6H12O6 6 02.
Which set of reactants will be the most
efficient (least wasteful of materials) for
the reaction?
A. 1.0 mol C6H12O6 and 3.0 mol O₂
B. 1.5 mol C6H₁2O6 and 3.0 mol O₂
C. 3.0 mol C6H₁2O6 and 6.0 mol O₂
D. 0.5 mol C6H₁2O6 and 3.0 mol O₂
Answers
Answer:
D
Explanation:
The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.
Use the periodic table or graphic in lesson. Choose the correct electron configuration of carbon. 1s 22s 22p 4 1s 22s 22p 2 1s 22s 22p 1 1s 22s 12p 2
Answers
The Correct electron configuration of carbon as 1s² 2s² 2p². Option B.
To understand why this is the correct electron configuration, let's break it down step by step:
The atomic number of carbon is 6, which means it has six electrons. Electrons are distributed in energy levels or shells around the nucleus.
The first shell, known as the 1s orbital, can hold a maximum of 2 electrons. Therefore, the first part of the electron configuration is 1s², indicating that two electrons occupy the 1s orbital.
The second shell has two subshells: the 2s orbital and the 2p orbital. The 2s orbital can hold a maximum of 2 electrons, while the 2p orbital can hold a maximum of 6 electrons. In the case of carbon, after the 1s orbital, two more electrons occupy the 2s orbital. So far, we have 1s² 2s².
The remaining two electrons in carbon are placed in the 2p orbital. The 2p orbital consists of three separate p orbitals: 2px, 2py, and 2pz. Each p orbital can hold a maximum of 2 electrons. Therefore, the last part of the electron configuration for carbon is 2p², indicating that two electrons occupy the 2px and 2py orbitals. Option B is correct.
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6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
At a particular temperature the solubility or NE in water is 0.0240 M when the partial pressure is 0.220 atm. What will the solubility (in m) be when the partial pressure of NE is 1.05atm?
Answers
It is expected at 1.05 atm the solubility increases if compared to the solubility at 0.222 atm.
What is the relationship between solubility and pressure?In general, an increase in pressure leads to an increase in solubility. In the same way, a decrease in pressure will decrease solubility.
What will happen at if the pressure is 1.05 atm?Considering the pressure increased, the most likely result is for the solubility to proportinally increase.
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You wish to prepare 250.0250.0 mL of a 400.0400.0 ppm w/v Fe2+Fe2+ ( MW=55.845 g/molMW=55.845 g/mol ) solution. How many grams of ferrous ammonium sulfate hexahydrate (Fe(NH4)2(SO4)2⋅6H2O(Fe(NH4)2(SO4)2⋅6H2O , MW=392.14 g/molMW=392.14 g/mol ) are needed to prepare this solution? Assume the final solution has a density of 1.00 g/mL.
Answers
Answer:
You need 0.702g of ferrous ammonium sulfate hexahydrate to prepare the desired solution.
Explanation:
First, you want to prepare 250.0mL of a 400.0ppm of Fe²⁺ (That is mg/L, w/v):
0.250L * (400mg / L) = 100mg Fe²⁺ = 0.1g Fe²⁺
Molar mass of Fe is 55.845g. moles are:
0.1g Fe²⁺ * (1mol / 55.845g) =
1.79x10⁻³ moles Fe²⁺The Fe²⁺ comes from ferrous ammonium sulfate hexahydrate, as 1 mole of this salt contains 1 mole of Fe²⁺, moles of the salt you need are:
1.79x10⁻³ moles Fe(NH₄)₂(SO₄)₂.6H₂O.
To convert these moles to grams you must use molar weight, MW, thus:
1.79x10⁻³ moles Fe(NH₄)₂(SO₄)₂.6H₂O * (392.14g / 1mol) =
You need 0.702g of ferrous ammonium sulfate hexahydrate to prepare the desired solution.For the following values, rank in order of increasing number of significant digits.
A. 80.0
B. 1020.80
C. 0.000045
D. 6.0030 x \(10^{-8}\)
Answers
B 6 sig figs
C 2 sig figs
D 5 sig figs
C, A, D, B
C, A, D, and B is the increasing order of significant digits among the following values.
What are significant digits?The number of digits in the value of a number that is meaningful are called significant digits or significant figures. These numbers have an accuracy that is matching to our measurements, simply are all the numbers required.
For Example, measure the area of a park to within 1 meter. The calculations can give an area of approximately 58.37215 m^2.
But here, there are more digits than the accuracy of measurement.
Thus, it can be decided to utilize only 2 of the significant digits. The final result is 58 m^2, while 5 and 8 are the two significant digits.
Some more examples can be
While showing a result like 4.500 we couldn't present it as 4.499 or 4.501While presenting a number like 300, it easily suggests that it isn't 200 or 400.A plus sign or a minus sign can be added to the value to show the level of accuracy. For example, 300 ± 10 shows that it lies somewhere between 290 and 310.
Therefore, in the above-mentioned values, C, A, D, and B is the increasing order of significant digits among the following values.
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Đốt cháy hoàn toàn 0,06 mol hỗn hợp X gồm hai amin no, đơn chức, mạch hở và một hiđrocacbon cần
vừa đủ 0,18 mol O2, thu được hỗn hợp Y gồm H2O, 0,11 mol CO2 và 0,01 mol N2. Mặt khác, cho 9,4
gam X tác dụng với dung dịch HCl dư, thu được m gam muối amoni. Giá trị của m là
A. 8,25. B. 7,45. C. 9,65. D. 8,95.
bạn nào việt giúp mình với
Answers
Help please...balance the equations. Extra points!
Answers
A mystery element has 18 protons. Which one of the following statements is true about the element?
o
A. The element belongs in row 2 of the periodic table and is classified as a halogen.
O
B. The element belongs in row 3 of the periodic table and is classified as a noble gas.
O
C. The element belongs in row 4 of the periodic table and is classified as an alkali metal.
D. The element belongs in row 5 of the periodic table and is classified as an alkaline earth metal.
Answers
Answer:
B
Explanation:
Elements in a group are determined by the number of valence electrons
Elements in a period are determined by the number of electrons shell
The electronic configuration of the element is
2,8,8
the number of valence electron is 8 that means it is in Group 8/O
the number of electron shell is 3 that means it is in period (row) 3
Group 8/O elements are called Noble gases
How many F atoms are in 5.54 g of F2?
Answers
The number of the atoms in the sample is 1.8 * 10^23 atoms.
What is the number of the Atoms?The mole is a unit of measurement in chemistry used to express amounts of a chemical substance.
The mole is used to determine the number of atoms, molecules, or other entities in a given sample of a substance.
We have to look at the concept of the mole in this question.
We know that to obtain the number of moles of the substances we have;
5.54 g /38 g/mol
= 0.15 moles
Then we would have that from the Avogadro's law;
0.15 moles * 6.02 * 10^23 * 2
= 1.8 * 10^23 atoms
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NEED HELP ASAP !
Which best describes an element?
A. elements are chemicals that are pure substance held together by chemical bonds
B. elements are mixtures of protons, neutrons, and electrons in different combination
C. elements are chemicals that are pure substances represented by symbols that have at least one capital letter
D. elements that are chemicals that are formed when temperature change happens or a precipitate forms
Answers
Answer:
A. Elements are pure substances.
Explanation:
Out of all four answers A would be best. Hope this helps.
Answer:
B
Explanation:
I think all options can define element in one form or another but an element is characterized by the atomic number it has i.e you will know it's Carbon due to it's number of protons, neutrons and/or electrons.
after 65 minutes, the amount of a particular radioisotope remaining is 3.13% of the initial amount. what is the half life of the radioisotope?
Answers
Answer:
13 mins
Explanation:
We need to find how many half lives are required to reach .0313
.0313 = 1/2^n log both sides and solve for n
log.0313 / log (1/2 ) = n where n= NUMBER of halflives
n = ~ 5 half lives
these 5 half lives took up 65 minutes
so EACH half life is 65/5 = 13 mins
Question 6 of 25
A man filling his car with gas is expecting what kind of energy conversion to
happen?
O A. Chemical potential energy to kinetic energy
B. Heat energy to gravitational potential energy
C. Kinetic energy to chemical potential energy
D. Gravitational potential energy to heat energy
Answers
Answer:
A. Chemical potential to Kinetic energy
Explanation:
The car engine burns gas to produce motion. Burning is a form of chemical reaction and the motion produced is the kinetic energy.
Are these equations balanced? If not how do I balance them?
Answers
Answer:
The answer to your question is given below.
Explanation:
1. CH3COOH(aq) + NaHCO3(s) —> CO2(g) + H2O(l) + Na+(aq) + CH3COO-(aq)
The above equation is balanced since the number of atoms of the different elements present on both sides of the equation are equal.
2. CaCl2 + NaHCO3 —> CO2 + CaCO3 + NaCl + H2O
The above equation can be balance as follow:
There are 2 atoms of Cl on the left side and 1 atom on the right side. It can be balance by putting 2 in front of NaCl as shown below:
CaCl2 + NaHCO3 —> CO2 + CaCO3 + 2NaCl + H2O
Now, there are 2 atoms of Na on the right side and 1 atom on the left side. It can be balance by putting 2 in front of NaHCO3 as shown below:
CaCl2 + 2NaHCO3 —> CO2 + CaCO3 + 2NaCl + H2O
Now the equation is balanced.
Experiment 4: A chemist mixes aqueous solutions of sodium hydroxide and aluminum chloride in a double-displacement reaction, which forms a white solid precipitate and a clear solution. Write the complete, balanced molecular equation for the reaction. Include physical states.
balanced equation:
Answers
The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)
In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.
The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.
The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.
In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.
It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.
Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.
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What is the solution to H30+ = 1.0 x 10-4 M
Answers
Answer:
The pH of the solution is 4 and it is acidic.
Explanation:
To calculate the pH knowing the concentration of H3O+, it is necessary to use the pH formula:
\(\begin{gathered} pH=-log\lbrack H_3O^+\rbrack \\ pH=-log(1.0*10^{-4}) \\ pH=4 \end{gathered}\)So, the pH of the solution is 4. Since the pH value is less than 7, the solution is acidic.
what causes the different crusts to rise and lower?
Answers
Answer:
tectonic plates
Explanation:
How many moles of H atoms are there in 2 moles of CH3CH2CH2CH3?
Answers
AnSweR: 10
ExplanAtion: My random idiot friend just told me
Identify which subatomic particles match each of these descriptions. One of the descriptions describes two particles. Make sure to include both particles it describes. Description Particle(s) have a relative charge of +1 have a relative charge of -1 have no charge located in the nucleus of an atom have a much lower mass than the other two types of particles Answer Bank protons electrons neutrons
Answers
Explanation:
protons have a relative charge of +1, they are located in the nucleus and the carry a positive charge
the electrons are negatively charged and have a charge of -1 . They are found orbiting on the shells .the electrons have a negligible mass of 1 / 1840
the neutrons have no charge they are located in the nucleus of an atom .
how many moles of nickel are in atoms are there in 9.00 X 10^9 Ni atoms
Answers
Answer:
1.49 x 10⁻¹⁴ moles Ni
Explanation:
To find the amount of moles in the sample, you need to multiply the amount of atoms by Avogadro's Number. This conversion is a ratio that describes how many atoms there are per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (atoms should be in the denominator). The final answer should have 3 sig figs like the given value.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
9.00 x 10⁹ atoms Ni 1 mole
--------------------------------- x -------------------------------- = 1.49 x 10⁻¹⁴ moles Ni
6.022 x 10²³ atoms
Q1. Which one of the following has the element name and symbol incorrectly
matched?
A. Br, bromine
B. Fe, iron
C. Cu, copper
D. P, potassium
Answers
Answer:
D. P, Potassium
Explanation:
Potassium on the periodic table is actually K
What is the formula for tin(IV) sulfide?
A. Sn4S
B. SnS2
C. Sns
D. SnS4
Answers
Answer:
\(SnS_{2}\)
Explanation:
The formula for tin(IV) sulfide is SnS\(_{2}\)
A sample of sodium azide (NaN3), a compound used in automobile air bags, was thermally decomposed, and 15.3 mL nitrogen gas was collected over water at 25°C and 755 torr. Given the vapour pressure of water at 25°C is 23.6 torr, how many grams of nitrogen were collected?
Answers
A sample of sodium azide (NaN3), a compound used in automobile air bags, was thermally decomposed, and 15.3 mL nitrogen gas was collected over water at 25°C and 755 torr. 131.1g is the mass of nitrogen.
In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application for a force.
The change caused by a force being applied is smaller the more mass a body has. The kilogramme, which is defined approximately equal to 6.62607015 1034 joule second in terms of Planck's constant, is the unit of mass within the Internacional System of Units (SI).
P×V = n×R×T
755×15.3 = n×0.0821×300
11551.5=n×24.63
n= 46.9
mass = 46.9×28=131.1g
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According to the following balanced reaction, how many moles of CaO are required to exactly react with 5.44 moles of H₂O? 4 CaO(s) + 2 H₂O(1)→ 4 CaOH(s) + O₂(g)
Answers
Answer: 10.88 moles of CaO
Explanation: The reaction takes place with 4 parts of CaO and 2 of H2O. If you have 5.44 moles of H20 you need double the amount of CaO
Vanadium (V) phosphate
Cobalt(II) sulfide
Beryllium nitrate
Silver sulfate
Manganese(IV) oxide
Manganese(II) fluoride
Carbonic acid
Carbon dioxide
name them
Answers
V2O5
CoS
BeN2O6
Ag2SO4
MnO2
MnF2
H2CO3
Co2
Which action demonstrates a CHEMICAL CHANGE?
A- Long hair is cut and dried.
B- A wooden pencil is sharpened and breaks
C- An ice cube melts and becomes a clear liquid.
D- An iron nail becomes orange and flaky on the surface.