Scientific Knowledge

A molecule might have:

• 1 atom

• from 2 atoms to thousands of atoms

• Only a few atoms from 2 to 10

• From 1 to thousands of atoms

Tags

NGSS.MS-PS1-1

Judge if it is true or false:

"If you change the atoms of a molecule, you won't change its properties."

• True

• False

Tags

NGSS.MS-PS1-1

Fact: Earth's atmosphere is mostly made of Nitrogen. Hydrogen is also part of it.

Judge if it is true or false:

"Ammonia has an atom of Nitrogen and three atoms of Hydrogen. Ammonia is poisonous and deadly to you if you breathe it. But many Nitrogen atoms and Hydrogen atoms, if separate, wouldn't cause you any harm as they are already in the air."

• True

• False

Judge if true or false.

"If you stack 1,000,000 molecules one on top of the other, you might reach the height of a human."

• True

• False

Judge if it is true or false:

"Atoms and molecules could be seen if you use a magnifying glass."

• True

• False

Judge if true or false.

"If you stack 1,000,000 atoms one on top of the other, you might reach the height of a human."

• True

• False

What's the difference between a hypothesis and a theory?

• "Theory" is another word for "fact;" "hypothesis" is another word for "guess."

• Hypotheses can't be proven; theories can.

• Theories have been confirmed through tests; hypotheses haven't.

• Theories contain many hypotheses; a hypothesis only contains one theory.

Place the following steps in sequence: Recognizing a problem; Testing a hypothesis; Drawing inferences

• A, C, B

• A, B, C

• B, C, A

• C, B, A

What must you do before you make a hypothesis?

• Run an experiment

• Make observations

• Form a theory

• Draw conclusions

If you were running an experiment to determine the temperature at which beans sprout the fastest, what would be the variable?

• The number of beans you plant.

• The height of the sprouts you grow.

• The amount of water you give the beans.

• The temperature at which each bean is kept.

Tags

NGSS.MS-LS1-5