Question 1

Which is NOT TRUE about the Laws of Conservation of Mass and Matter.

I. The mass of raw materials is not equal to the mass of the product.

II. There is a change in the type of elements before and after the reaction.

III. The mass and type of atoms of the reactant/s are not the same as the mass and type of atoms present in the product/s.

Accepted Answer

I, II, III

Answer

II and II

Answer

I only

Answer

I and II

Question 2

In the equation 2FeSO₄(s) + Heat → Fe2O₃(s) + SO₂ (g)+ SO₃(g)

Accepted Answer

the equation is balanced.

Answer

there are more elements on the product side.

Answer

the mass of the product is greater.

Answer

there are more elements on the reactant sides.

Question 3

Based on this unbalanced equation CaCO₃ -> ____+ CO₂, what would be the other product?

Accepted Answer

CaO

Answer

CO

Answer

O2

Answer

C

Question 4

What are the possible products when two aqueous ionic solution combine chemically?

I. Water

II. Gas

III. An insoluble solid

Accepted Answer

I, II, III

Answer

III only

Answer

I only

Answer

II only

Question 5

The products derived from a combustion reaction are _____.?

Accepted Answer

CO₂ + H₂O

Answer

CO₂ + O₂

Answer

C + H2O

Answer

CO₂ + H₂

Question 6

Magnesium has an oxidation state of +2 and oxygen has -2. What would be the product, if these ions are combined?

Accepted Answer

MgO(s).

Answer

MG₃O₂(s).

Answer

Mg3O(s).

Answer

Mg₂O₂(s).

Question 7

What would NOT indicate that the chemical equation is balanced?

Accepted Answer

The atoms in the reactants are lesser in number compared to the products.

Answer

The type and numbers of atoms are the same on both reactants and products sides.

Answer

The type of atoms in the reactants is always the same as the type of atoms in the products.

Answer

The sum of their masses is equal for both the reactants and products.

Question 8

If the products of a double displacement reaction are AgCl(s) + NaNO₃(aq), the reactants must be ____.

Accepted Answer

AgNO₃(aq) + NaCl(s)

Answer

AgNO₂ (aq)+ NaCl(s)

Answer

Ag₄NO₃(aq) + NaCl(s)

Answer

Ag₂NO3(aq) + NaCl(s).

Question 9

The other product for this equation 2 HCl(aq) + Zn(s) → ZnCl₂(aq) + ____is

Accepted Answer

H2(g).

Answer

H2O (g)

Answer

Cl2(g).

Answer

H2O (l).

Question 10

Predict the products of this equation MgCl2 + I2 →?

Accepted Answer

No Reaction

Answer

Both A and B

Answer

MgCl2(s) + I2 → MgI2 (s) + Cl2 (s)

Answer

MgCl2(s) + I2 → MgCl2(s) + I(s)

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