STAAR Review Day 6 Topics Questions

Which of the following chemical formulas contain the same amount of oxygen atoms?

• I, II, and III

• II, IV, and V

• I and IV

• I and V

A model of (CH₂O)₄ was created using colored beads. Carbon atoms were represented by black beads, hydrogen atoms by red beads, and oxygen atoms by blue beads. Which of the following combinations of beads shows an accurate model of (CH₂O)₄?

• 4 black, 8 red, and 4 blue

• 1 black, 2 red, and 1 blue

• 4 black, 6 red, and 4 blue

• 1 black, 8 red, and 1 blue

Tags

NGSS.MS-PS1-1

What mass of methane gas (CH₄) is required in order to follow the Law of Conservation of Mass?

• 11.3g

• 6.8g

• 3.5g

• 2.3g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A group of students combined different substances together during several experiments. Their observations are recorded on the chart below. Experiment 1: A blue liquid and a yellow liquid were mixed and it turned green. Experiment 2: A solid substance dissolved in a clear liquid. Experiment 3: Two room temperature liquids were mixed and the temperature increased. Experiment 4: Two different liquids were mixed and began to separate and layer in a beaker. In which experiment did a chemical reaction likely occur?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2

A food web is shown below. Which organisms could be both predators and prey depending on the relationship represented on the food web?

• Hawk and fox

• Grasshopper and beetle

• Snake, frog, and mouse

• Fungus and grass

Tags

NGSS.MS-LS2-2

The chart below shows how several body parts aid in the digestion of food. Which of the following is a physical change that occurs through the process of digestion?

• Break down food by tearing, crushing, and grinding into smaller pieces

• Enzymes and acid break down food into smaller pieces for absorption

• Food molecules are absorbed into the bloodstream

• Water molecules are absorbed from waste