What is the first thing a student should do if an accident happens during a science experiment?

• report to the teacher

• clean the laboratory station

• locate the nearest exit

• put on safety goggles

Which device is used to determine the volume of a liquid?

• anemometer

• graduated cylinder

• test tube

• thermometer

Which is a compound?

• sodium

• sugar

• nitrogen

• air

Tags

NGSS.MS-PS1-1

This table provides information about some group 1 elements. Which is the best estimate of the melting point of Rubidium (Rb)?

• 25°C

• 40°C

• 75°C

• 184°C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

• Some of the atoms during the reaction escaped into the air.

• Some of the atoms during the reaction were destroyed.

• Some of the atoms during the reaction became heavier.

• Some of the atoms during the reaction changed to a different kind of atom.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.

H₂CO₃ → H₂O + CO₂

How does the reaction support the Law of Conservation of Mass?

• Several molecules of water are produced.

• The mass of carbon atoms is reduced during the reaction.

• The mass of the atoms in the reactant equals the mass of the atoms in the products.

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

Tags

NGSS.MS-PS1-5

Which best describes a method of obtaining energy that may cause changes in water temperature and harm to fish populations?

• burning coal

• using ethanol in cars

• installing solar panels on a home

• generating electricity in a hydroelectric power plant

Tags

NGSS.MS-LS2-4

Which is a nonrenewable resource?

• oil

• sunlight

• water

• wood

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?

• All organisms would die.

• All organisms would continue to live as they now do.

• The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.

• The number of salt-intolerant organisms would increase, and the number of salt-tolerant organisms would decrease.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which would indicate the water in a lake is not safe for drinking?

• many varieties of fish in the lake

• high dissolved-oxygen levels in the lake

• cold water temperature of the lake

• high turbidity levels in the lake