Concept 1.3-The Composition of Matter-7th Grade

1.

Multiple Choice

30 sec

1 pt

The properties of _______________ are different from the properties of the elements in it.

compounds

atoms

isotopes

ions

2.

Multiple Choice

30 sec

1 pt

Pure sodium can cause burns. Pure chlorine can cause burns. When they combine into a molecule (NaCl) the new substance is _______________.

a solid crystal that is safe to touch

an explosive solid that must be handled carefully

a combination of gases that can be deadly

a neutral gas that is safe to breathe

3.

Multiple Choice

30 sec

1 pt

The shapes of _____________ are determined by the regularly repeating arrangement of its atoms.

hydronium ions

atoms

crystals

hydroxide

4.

Multiple Choice

30 sec

1 pt

If you look at a crystal of table salt with a magnifying glass it looks like a tiny cube. This is because _______________.

the molecular structure of sodium chloride is destroyed when it is formed

salt is formed by forcing it through a screen with square holes

salt blocks are cut by machine into tiny square blocks

the molecular structure of sodium chloride forms natural cubes

5.

Multiple Choice

30 sec

1 pt

When water becomes ice, the molecules spread out to form a specific shape. What determines this shape?

the number of water molecules in the ice

the temperature of the ice

the structure of the water molecules

the mass of the ice cube produced

6.

Multiple Choice

30 sec

1 pt

Salt and sugar appear similar, but their crystals look different at the atomic level. What does this say about the molecular structures of salt and sugar?

Salt and sugar molecules are made of the same atoms arranged in the same patterns.

Salt and sugar molecules are made of different atoms arranged in the same pattern.

Salt and sugar molecules contain the same atoms arranged in different patterns.

Salt and sugar molecules contain different atoms arranged in different patterns.

7.

Multiple Choice

30 sec

1 pt

Atoms of an element are determined by which of the following?

same number of electrons

same number of neutrons

same number of protons

same number of protons and electrons

8.

Multiple Choice

30 sec

1 pt

Which part of an atom determines its position as an element on the periodic table?

electrons

protons

neutrons

space

9.

Multiple Choice

30 sec

1 pt

What do the small particles protons, neutrons, and electrons compose?

cells

atoms

space

electricity

10.

Multiple Choice

30 sec

1 pt

A(n) ____________ bond is when atoms share electrons.

ionic

metallic

covalent

polar

11.

Multiple Choice

30 sec

1 pt

An atom has 5 protons in its nucleus that gives it positive charge. What can be inferred about the number and position of other particles that make the atom electrically neutral?

5 neutrons are located inside the nucleus.

5 electrons are located inside the nucleus.

5 neutrons are located outside the nucleus.

5 electrons are located outside the nucleus.

12.

Multiple Choice

30 sec

1 pt

The chemical name for the compound Carbon Dioxide is _________________.

C^2

$CO^2$

$Ca^2$

$Cd$

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