7th Grade Science Final Review

A student observes that when a solution of nitric acid is mixed with a solution of sodium carbonate in a beaker, bubbles form and the beaker feels warm. Which of the following statements best describes this reaction?

• The reaction between an acid and a base forms a precipitate.

• Gas formation is evidence of a chemical reaction.

• The molecular arrangement of the reactants does not change after the reaction.

• The reaction between nitric acid and sodium carbonate is endothermic by nature.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

What happens to the motion of the molecules in gases if heat energy is removed?

• The molecules will stay at rest.

• The molecules will move faster.

• The molecules will move slower.

• The molecules will move at the same speed.

Tags

NGSS.MS-PS1-4

When a beaker of water is heated, the volume increases slightly. What happens to the molecules as a liquid is heated?

• They are getting smaller.

• They are increasing in speed.

• They are increasing in size.

• They are moving upwards.

Tags

NGSS.MS-PS1-4

A student created a chemical reaction as part of his science experiment in which 4.0 grams of one reactant combined completely with 12.5 grams of a second reactant to form a product. What is the mass of the product formed by this chemical reaction in a closed system? The mass is _____ grams. (Please answer to the nearest tenth position.)

• 8.5g

• 16.5g

• 21g

• 49g

Tags

NGSS.MS-PS1-5

Ron investigated heat transfer using a bottle of water. He placed the bottle in a room where the temperature was 20.5oC. Ron measured the temperature of the water in the bottle at 7am to be 12.5oC. At 3pm, he measured the water to be 20.5oC. In which direction did the thermal energy move between the surroundings and the water in the bottle from 7am to 3pm?

• Thermal energy moved out of the water in the bottle.

• Thermal energy did not move during this experiment

• Thermal energy moved into the air in the room.

• Thermal energy moved into the water in the bottle.

Tags

NGSS.MS-PS1-4

During the condensation phase of the water cycle, which statement best describes what happens:

• Water vapor losing energy and turning into liquid water.

• Water from streams, lakes, and oceans gaining energy and turning into water vapor.

• Water in liquid form moving through the ground.

• Water in liquid or solid form falling toward earth’s surface.

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-1

Which statement correctly describes a water cycle process?

• Evaporation can occur when water gains energy from the sun and changes into water vapor

• Condensation can occur when liquid water molecules in clouds lose energy and fall to Earth.

• Transpiration can occur when atmospheric water vapor gains energy and moves higher in the atmosphere.

• Precipitation occurs when atmospheric water vapor loses energy and forms liquid water droplets.

Tags

NGSS.MS-ESS2-4

Cool air masses tend to:

• be less dense and flow over warm air masses.

• be lifted up by more dense warm air masses.

• be more dense and flow under warm air masses.

• mix easily with warm air masses.

Tags

NGSS.MS-ESS2-5

Warm air masses tend to:

• Be more dense and flow under cool air masses.

• Be lifted up by less dense cool air masses

• Mix easily with cool air masses.

• Be less dense and flow over cool air masses.

Tags

NGSS.MS-ESS2-5

Which of these could increase average global temperatures?

• increased number of animal species

• decreased carbon dioxide emissions

• increased use of fossil fuels

• increased ocean algae blooms

Tags

NGSS.MS-ESS3-5