Chemistry Unit Test 1.

Why is iron rusting not a physical change?

• A new substance with new properties forms when iron rusts.

•  Iron is magnetic.

•  It cannot be observed.

• The identity of iron remains unchanged when it rusts.

• Iron rusting is a physical change

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What is an example of a chemical property?

• ability to react with oxygen

• boiling point

• magnetism

• abilty to dissolve in water

• melting point

Which statement explains the law of conservation of mass?

• Every reaction creates an equal amount of mass related to the amount of energy required for the reaction.

• Substances cannot be created or destroyed in a reaction.

• The total amount of mass is equal to the volume of both chemicals in the reaction.

• The total mass before a chemical reaction is the same as the total mass after the reaction.

• Mass can be destroyed in a reaction, but cannot be created.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

In a chemical equation, it is true that:

• the reactant side and product side can have different numbers of atoms for each element
• there can be different elements on the reactant side and the product side
• an element or compound must be accompanied by a phase change
• the products are on the left and the reactants are on the right.

• the reactants and the products have to have the same amount of each element.

Tags

NGSS.MS-PS1-5

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many total atoms in all are in a molecule of serotonin?

C₁₀H₁₂N₂O

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

Coal contains mostly carbon. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

• The shape of the coal changes
• Oxygen is present
• A new substance is produced
• Coal is made up of more than one element
• The mass of the coal didn't change.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which example is a chemical change?

• baking powder fizzing
• water boiling
• ice melting
• sugar cube dissolving
• shredding paper

Tags

NGSS.MS-PS1-2

Which is an example of a chemical reaction?

• paper cut into small pieces
• chocolate melting in a pan
• flour and sugar mixed in a bowl
• cookies baking in an oven
• mixing red and white paint to get pink paint.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders
• Mixers

Tags

NGSS.MS-PS1-1