Question 1

Question

A)According to the law of conservation of mass, which statement about chemical reactions is always true?(1 point)
Responses

The states of the substances in the reactants is the same as the states of the substances in the products.
The states of the substances in the reactants is the same as the states of the substances in the products.

The number of molecules in the reactants is the same as the number of molecules in the products.
The number of molecules in the reactants is the same as the number of molecules in the products.

The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.

The number of substances in the reactants is the same as the number substances in the products.
The number of substances in the reactants is the same as the number substances in the products.
Question 2
A)When 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2), how many moles of ammonia (NH3) are produced?(1 point)
Responses

1 mole
1 mole

2 moles
2 moles

3 moles
3 moles

4 moles
4 moles
Question 3
A)
Sulfur trioxide gas combines with water to form a single product.

SO3 + H2O → ?

Based on the law of conservation of mass, which option is the product of the reaction?

(1 point)
Responses

H2SO4
H 2 SO 4

H2SO3
H 2 SO 3

HSO4
HSO 4

H2S2O4
H 2 S 2 O 4
Question 4
A)
Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.

2 KNO3 + PbI2

How many moles of each reactant are involved in the reaction?

(1 point)
Responses

1 mole of lead (II) nitrate and 1 mole of potassium iodide
1 mole of lead (II) nitrate and 1 mole of potassium iodide

2 moles of lead (II) nitrate and 2 moles of potassium iodide
2 moles of lead (II) nitrate and 2 moles of potassium iodide

2 moles of lead (II) nitrate and 1 mole of potassium iodide
2 moles of lead (II) nitrate and 1 mole of potassium iodide

1 mole of lead (II) nitrate and 2 moles of potassium iodide
1 mole of lead (II) nitrate and 2 moles of potassium iodide
Question 5
A)
In a reaction, 1 mole of silver nitrate combines with 1 mole of sodium chloride.

AgNO3 + NaCl

Which statement about the product is justified by the law of conservation of mass?

(1 point)
Responses

There will be 1 mole of silver (Ag) in the product.
There will be 1 mole of silver (Ag) in the product.

There will be two molecules in the product.
There will be two molecules in the product.

There will be five atoms in the product.

Answer 1

Here are the answers to your questions:

Question 1: The correct response is:

• The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.

Question 2: The stoichiometry of the reaction (N2 + 3H2 → 2NH3) shows that:

• 2 moles of ammonia (NH3) are produced. Correct response: 2 moles

Question 3: The product of the reaction of sulfur trioxide with water is:

• H2SO4 (sulfuric acid). Correct response: H2SO4

Question 4: From the balanced reaction (2 KNO3 + PbI2), the involved moles are:

• 2 moles of lead (II) nitrate and 1 mole of potassium iodide. Correct response: 2 moles of lead (II) nitrate and 1 mole of potassium iodide

Question 5: From the reaction (AgNO3 + NaCl), based on conservation of mass:

• There will be 1 mole of silver (Ag) in the product. Correct response: There will be 1 mole of silver (Ag) in the product.

If you have any additional questions or need further explanation, feel free to ask!