Question

1. when different atoms combine _______ are formed.

compounds
elements
heterogeneous mixtures
homogeneous mixtures

1. a suspension is a homogeneous mixture.

true
false

1. which item is a substance?

aluminum
apple juice
muddy water

1. what is a compound?

a substance with fixed
composition
two or more elements
chemically combined
the simplest form of matter
from which more complex

Explanation:

1. Compounds are defined as substances formed when different atoms chemically combine. Elements are pure single atoms, mixtures involve physical mixing not atom combination.
2. Suspensions have visible particles that settle, making them heterogeneous (not uniform throughout).
3. A substance has a fixed composition; aluminum is an element (pure substance), while apple juice and muddy water are mixtures.
4. A compound is specifically two or more different elements that are chemically bonded together, with a fixed ratio.

Answer:

1. compounds
2. False
3. aluminum
4. Two or more elements chemically combined