Which quantities must be conserved in all chemical reactions? 1) mass, charge, density
2)mass, charge, energy
3) charge, volume, density
4) charge, volume, energy

Answers

Answer 1

Answer: 2) mass, charge, energy

in a balanced reaction, all of the following are conserved

Answer 2

Answer:

Answer: It's B this will help u

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If there are 4.5 x 1020 atoms of Silver are present, then how many moles of Silver are there? Question 1 Answer a. 0.081 moles b. 12.4 moles c. 0.0007 moles d. 1,338 moles
HELP ASAPFor the reaction A(g) → 2B(g), Keq = 4.5 × 105. Which statement is true for the system at equilibrium? a) [A] >> [B] b)Changing the temperature will have no affect on the equilibrium. c)There is twice as much A as there is B in the reaction vessel. d)There is more than 100 times more B then there is A in the reaction vessel. e)There is twice as much B as there is A in the reaction vessel.

If the isotope 32S has 16 protons and 16 neutrons, how many protons and how many neutrons will the isotope 35S have? 16pr and 19 ne 19pr and 16ne 18pr and 17ne or cannot be determined

Answers

Answer:

16 protons and 19 neutrons

If there is 8 g of a substance before a physical change, how much will there be afterwards?

Answers

8 grams because physical changes dont involve a change in the substance's components, so the matter can not be destroyed, onlt changed.

Answer:

8 g

I took the quiz and because the amount doesn’t change

Why does an ion have an electrical charge?

Answers

An ion has an electrical charge because it either has more electrons than protons or it has more protons than electrons. Electrons, which are found in the shells of an atom, have a negative charge, while protons, found in the atom's nucleus, have a positive charge.

How much space (volume) will 180.0 g of gold occupy?

Answers

Answer:

The space occupy by the 180.0 g of gold will be 9.32 cm³

Explanation:

Given data:

Mass of gold = 180.0 g

Volume occupy by the gold = ?

Solution:

The given problem will be solved through the density formula.

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

The density of gold from literature is 19.320 g/cm³

Now we will put the values in formula.

19.320 g/cm³ = 180.0 g/ V

V = 180.0 g/ 19.320 g/cm³

V = 9.32 cm³

The space occupy by the 180.0 g of gold will be 9.32 cm³.

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Number of moles:

mass of solute / molar mass

78.6 / 60.1 = 1.3078 moles

hope this helps!

Which formula represents lead(II) chromate?(1) PbCrO4 (3) Pb2CrO4
(2) Pb(CrO4)2 (4) Pb2(CrO4)3

Answers

The formula that represents Lead (II) Chromate is PbCrO4. It is a chemical compound with a strong yellow color.

Lead chromate and lead sulfate are found in the crystal Pb(Cr, S)O₄, which is a changeable solid mixed phase. This material is the end product of a co-precipitation reaction between lead and chrome salts (see the chapter on production and usage for further information). The correct option is 1.

Water does not dissolve lead chromate, which is produced by the double decomposition process. It is also used as a pigment and is referred to as chrome yellow. In a media that has been buffered with a solution of acetic acid and lead acetate, the lead precipitates as chrome.

There may be significant amounts of water-soluble lead compounds in lead chromate pigments. The formula that represents Lead (II) Chromate is PbCrO₄.

Thus the correct option is 1.

To know more about lead(II) chromate, visit;

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