1.4

The compound ammonia is composed of nitrogen and hydrogen atoms. If two atoms of nitrogen completely react with six atoms of hydrogen to form two molecules of ammonia, which best describes the number of hydrogen atoms present in the two molecules of ammonia?

• two hydrogen atoms

• four hydrogen atoms

• six hydrogen atoms

Tags

NGSS.MS-PS1-1

In the equation below, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas. Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?

• 1 gram

• 7 grams

• 19 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

• A physical change occurred.

• Atoms involved in the reaction lost mass.

• Precipitates were created in the new solution.

• Gases were released to the atmosphere.

Tags

NGSS.MS-PS1-5

Two neurons connect at a place called a _______.

• synapse

• stimulus

• cerebrum

• cell body

After seeing a moth, a frog uses its tongue to catch it. This is an example of:

• gathering information

• responding to a stimulus

• maintaining homeostasis

• collecting waste

Which is NOT a function of the nervous system?

• gathering information

• responding to a stimulus

• maintaining homeostasis

• collecting waste

Tags

NGSS.MS-LS1-3

A reflex signal must travel to the brain before a response to the stimulus can occur.

• True

• False

What is a reflex?

• an automatic movement in response to a stimulus

• the gap between neurons where chemical reactions occur

• the part of the brain responsible for involuntary movements

• a muscle memory

Jubjib loves to dance during Quizlet live. Which part of her brain stores the memories for her dance techniques?

• cerebellum

• cerebrum

• brain stem

• medulla

Cover dancing requires a lot of coordination, but which part of your brain coordinates your muscle movements?

• cerebellum

• cerebrum

• brain stem

• hypocampus