IQWST Unit 3

What is bioaccumulation or biomagnification?

• buildup of toxins in an organism

• the total mass/amount of organisms in a given area

• the number of different species in an area

Tags

NGSS.MS-LS2-3

Which organism would have the most bioaccumulation?

• grass

• rabbit

• snake

• hawk

Tags

NGSS.MS-LS2-4

Which organisms are most affected by bioaccumuation?

• Top predators

• Producers

• Primary Consumers

• Herbivores

Tags

NGSS.MS-LS2-4

Which statement best describes the trend for the dolphin population?

• The dolphin population is decreasing.

• The dolphin population is increasing.

• The dolphin population goes up and down.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

How do we know when a chemical reaction has definitely taken place?

• By making an educated guess

• By observing signs of a possible chemical reaction

• By observing a new substance with different properties

• It's impossible to tell if a chemical reaction has taken place

Tags

NGSS.MS-PS1-2

Which of the following is a way to represent a chemical reaction?

• By using a word equation

• By using a model

• By using a chemical formula

• All of the above are correct

Tags

NGSS.MS-PS1-2

What can this diagram show us about chemical reactions?

• matter is not created during a chemical reaction

• matter is not destroyed during a chemical reaction

• atoms rearrange during a chemical reaction to form new substances

• all of the above can be demonstrated

Tags

NGSS.MS-PS1-5

Which properties were different between the magnesium ribbon & magnesium oxide after burning?

• color & solubility

• hardness & solubility

• solubility & density

• color & hardness

Tags

NGSS.MS-PS1-2

During the the electrolysis of water ....

• a chemical reaction occurred

• water molecules were destroyed

• a precipitate was formed

• none of the above occurred

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During the the electrolysis of water ....

• hydrogen gas & oxygen gas were produced

• a battery provided an electrical current to cause the reaction

• twice as much hydrogen gas was produced than oxygen gas

• all of the above occurred

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5