Chemistry Practice #2

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

• a) 12 atoms of carbon

• b) 6 atoms of carbon

• c) 3 atoms of carbon

• d) 2 atoms of carbon

Tags

NGSS.MS-PS1-5

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• a) During a chemical reaction, the total amount of matter stays the same.

• b) During a chemical reaction, matter is destroyed.

• c) During a chemical reaction, one or more new substances is formed.

• d) During a chemical reaction, the total number of atoms increases.

Tags

NGSS.MS-PS1-5

When wood is burned, it is changed into ash and carbon is released into the atmosphere as smoke. If 2 kg of wood is burned, how much ash would result?

• a) Exactly 2 kg because mass is conserved in this system.

• b) Less than 2 kg because some of the mass is lost as gas.

• c) Greater than 2 kg because carbon is added to the system.

• d) About 2 kg because some carbon escapes the system and some ash is added.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A compound containing potassium (K), chlorine (Cl) and oxygen (O) has the chemical formula KClO3. Which best represents a balanced chemical reaction showing the breakdown of KClO3 into simpler substances?

• a) 2KClO3 -> 2KCl

• b) 2KClO3 -> Cl2 + 3O2

• c) 2KClO3 -> 2K + 3O2

• d) 2KClO3 -> 2KCL + 3O2

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which best compares a homogeneous mixture and a heterogeneous mixture?

• a) Homogeneous mixtures are formed through physical changes, while heterogeneous mixtures are formed through chemical changes.

• b) Homogeneous mixtures are composed of two different liquids, while heterogeneous mixtures are composed of a liquid and a solid.

• c) The particles in a homogeneous mixture will separate if left undisturbed, while the particles in a heterogeneous mixture cannot be filtered out of the mixture.

• d) A homogeneous mixture is the same throughout, while a heterogeneous mixture is not uniform throughout.

Identify Sulfuric Acid as an element, compound, or solution.

• Element

• Compound

• Mixture

Tags

NGSS.MS-PS1-1

Identify an Iron Nail as an element, compound, or solution.

• Element

• Compound

• Solution

Identify a Brass Trumpet as an element, compound, or solution.

• Element

• Compound

• Solution

Identify Air as an element, compound, or solution.

• Element

• Compound

• Solution

Identify Baking Soda as an element, compound, or solution.

• Element

• Compound

• Solution

Tags

NGSS.MS-PS1-1