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

• compounds

• atoms

• isotopes

• ions

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-2

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

• hydronium ions

• atoms

• crystals

• hydroxide

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS1-1

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

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

• electrons

• protons

• neutrons

• space

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

• cells

• atoms

• space

• electricity

Tags

NGSS.MS-PS1-1

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

• ionic

• metallic

• covalent

• polar