STAAR Review Warm-Up 8.6E Chemical Reactions

• Two new substances are formed in the products.

• Water is one of the products, but not one of the reactants.

• Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.

• One chlorine atom pairs with one sodium atom in the products, and one chlorine atom pairs with one hydrogen atom in the reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams of sulfuric acid were used in the reaction?

• 98 g

• 62 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement describes an action that most likely resulted in a chemical reaction?

• A pan of water was heated on a stove, and steam formed.

• A liquid was mixed with another liquid, and a precipitate formed.

• A liquid was sprayed into the air, and a sweet odor was smelled.

• A child blew through a wand filled with soap, and bubbles were produced.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these observations is an indication that a chemical reaction has occured?

• Steam forms above boiling water.

• A solid forms when a clear solution is frozen.

• A solid forms when two clear solutions are mixed.

• Sugar crystals form on the sides of a boiling pot of sugar water.

Tags

NGSS.MS-PS1-2

Which observation would indicate that a chemical reaction occurred?

• The vinegar took the shape of the container in step 1.

• The steel wool sank into the vinegar in step 3.

• The temperature of the vinegar increased during step 4.

• The steel wool changed shape during step 6.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• There is a change in shape.

• There is a change in volume

• The two liquids mix into a solution.

• The two liquids form a new substance.

Tags

NGSS.MS-PS1-2

What happens to the total mass as the reaction takes place?

• The mass increases.

• The mass remains constant.

• The mass decreases.

• The mass first decreases and then increases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5