7th HMH Unit 1 L 1 & 2

Which of these answers best describes a scientific theory?

• an explanation based on the opinion of a scientist

• a well-supported and widely accepted explanation of nature

• a description of a specific relationship under given conditions

• a statement describing what always happens under certain conditions

Tags

NGSS.MS-LS2-4

a statement describing what always happens under certain conditions

• New evidence leads to modification of ideas.

• Scientific ideas rarely change, because they are based on extensive evidence.

• As a scientific idea changes, it eventually becomes a scientific theory and then a law.

• Scientists form opinions based on evidence and decide how the idea should change.

Tags

NGSS.MS-PS1-2

A chemist wants to examine specific chemical reactions and isolate certain products using a controlled experiment. How would the chemist perform this experiment?

• in a laboratory

• out in the field

• by performing a survey

• by using scientific laws

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which of these scientists would most likely engage in fieldwork to observe organisms?

• chemist

• biologist

• physicist

• mathematician

Tags

NGSS.3-LS1-1

NGSS.3-LS2-1

NGSS.3-LS3-1

During a scientific investigation, which step will a scientist likely perform first?

• Collect and organize data.

• Plan the experimental procedure.

• Define the problem for investigation.

• Defend conclusions drawn from data.

Tags

NGSS.MS-PS2-2

Which scientific investigation does not include dependent and independent variables?

• observing and counting bird populations

• studying the effect of temperature on bacterial reproduction rates

• investigating the effect of mass on the speed at which an object falls

• testing a model car’s air flow resistance at different wind speeds in a wind tunnel

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

___ study everything from the tiniest organisms to human beings.

• chemist

• biologist

• physicist

• mathematician

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Both a scientific theory and a scientific law are both based on

• controlled environment

• scientific evidence

• claims

All the measurements and data scientists gather in support of a scientific explanation.

• empirical evidence

• claim

• theory

Tags

NGSS.MS-LS2-4

NGSS.MS-LS1-5

As scientists learn more about a subject (for example atoms) they need models that are

• a more complex picture

• a simplified / easier picture

Tags

NGSS.MS-PS1-1