Chemical Reactions Review

Which of the formulas above contain equal numbers of nitrogen atoms?

• Formulas I and III

• Formulas I and V

• Formulas II and III

• Formulas I, II, and V

Tags

NGSS.MS-PS1-1

According to the Chemical Compounds table above, how many atoms of hydrogen are in Ethanol?

• 0

• 2

• 5

• 6

Tags

NGSS.MS-PS1-1

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below.

Based on their observations, can the students correctly conclude that a chemical reaction occurred?

• No, because the metal strip was still visible

• Yes, because a new material of a different color formed on part of the metal strip

• No, because the solution stayed blue

• Yes, because the volume of the blue solution stayed the same

Tags

NGSS.MS-PS1-2

A chemical equation for the reaction between calcium hydroxide, Ca(OH)₂, and sulfuric acid, H₂SO₄ is shown. The masses of some of the reactants and products are given in grams.

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

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown.

How many atoms of each element are in one molecule of 2-heptanone?

• 4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

• 6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

Tags

NGSS.MS-PS1-1

How many different elements are in the chemical equation?

• 2

• 4

• 13

• 50

Tags

NGSS.MS-PS1-1

The chemical equation above demonstrates that —

• matter cannot be created or destroyed by a chemical reaction

• the reactants are the same substances as the products

• the number of molecules is equal

• the elements on the reactants side are changed into different elements on the products side

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the substances produced a chemical change?

• Substances 1 and 2

• Substances 1 and 3

• Substances 1 and 4

• Substances 2 and 3

Tags

NGSS.MS-PS1-2

During an investigation, students dropped a tarnished penny into a solution of acetic acid and sodium chloride. Tiny bubbles formed around the penny, and the penny was less tarnished after two minutes of soaking in the acetic acid and sodium chloride solution. The student inferred that a chemical reaction occurred.

 

What evidence supports the student’s inference?

• The penny experienced a color change, and a gas was produced.

• The penny experienced a color change, and a precipitate was formed.

• The penny experienced a color change and is in a new state of matter.

• The penny experienced a color change and produced light.

Tags

NGSS.MS-PS1-2

The results of which of the above investigations indicates that the substances least likely reacted chemically?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2