Chemistry Middle School

Molecules _____.
A) are named according to the alphabet
B) are the smallest units of matter
C) must be made of two different elements
D) are made of two or more atoms

Answers

Answer 1

Answer:

D

Explanation:

A is incorrect because they are named by elements and the number of atoms.

B is incorrect because the smallest units of matter are usually considered to be atoms.

C is incorrect because O2 is considered a molecule, and is made of only one element.

So, D is correct, because molecules are groups of two or more atoms that are held together by chemical bonds.

Answer 2

Answer:

D

Explanation:

Related Questions

What do you call the gravitational attraction between you and the earth?

Answers

Answer: weight

Explanation:

Elizabeth is pushing against a wall as she stretches before exercising as shown below. The wall pushes back against Elizabeth's hands with the same force in the opposite direction. Which of Newton's laws does this best demonstrate? A. Newton's universal law of gravitation B. Newton's third law of motion C. Newton's second law of motion D. Newton's first law of motion

Answers

Answer:

Newton's third law of motion

Explanation:

According to Newton's third law of motion, for every action force there is an equal and opposite reaction force. In this case, the action force is Elizabeth pushing against the wall with her hands. As this happens, there is an equal and opposite reaction force in which the wall pushes back on Elizabeth's hands.

Final answer:

The scenario where Elizabeth pushes against a wall and the wall pushes back with equal force demonstrates Newton's third law of motion.

Explanation:

When Elizabeth is pushing against the wall and the wall pushes back with an equal and opposite force, this illustrates Newton's third law of motion. According to this law, for every action, there is an equal and opposite reaction. This means that the forces are equal in magnitude but act in opposite directions on different systems, which is why they don't cancel out. An example to further explain this is a swimmer who pushes against the wall of a pool with her feet, and consequently, the wall pushes back on the swimmer, propelling her in the opposite direction of the push.

By applying Newton's third law, we can understand that when Elizabeth pushes against the wall, the wall pushes back on her hands with an equal force in the opposite direction. This law helps us understand the relationship between forces in a given interaction.

Remember, Newton's first law of motion (D) states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an external force.

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