Chemistry Properties of Matter

When the penny turns into "gold" on the hotplate

• physical reaction because the color changed

• chemical reaction because the zinc and copper chemically combined to form brass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sugar

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Why do ionic compounds have high melting and boiling points?

• Lots of energy is needed to break strong electrostatic bonds

• Lots of energy is needed to break strong intermolecular forces

• Lots of energy is needed to break weak electrostatic bonds

• Lots of energy is needed to break weak intermolecular forces

Tags

NGSS.MS-PS1-4

Most metals have high melting and boiling points because…

• they have strong ionic bonds

• they have strong intermolecular forces

• they have strong covalent bonds

• they have strong metallic bonds

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NGSS.MS-PS3-4

What is a limitation of the particle model?

• The particle model assumes that particles have no forces between them

• The particle model assumes that particles should be square

• The particle model assumes that there are more particles than in real life

• The particle model assumes that there are fewer particles than in real life

In graphite, how many covalent bonds does each carbon atom form?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which one of these is NOT a property of a fullerene?

• A hollow shape

• Hexagonal carbon rings

• A molecule of carbon atoms

• Short length and large diameter

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NGSS.MS-PS1-1

Metals consist of giant structures of           arranged in a regular pattern.

• atoms

• neutrons

• molecules

• protons

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NGSS.MS-PS1-1

Non-metal atoms become negatively charged ions by…

• gaining electrons

• sharing electrons

• losing electrons

• gaining protons

Which of these is NOT an example of a giant covalent substance?

• Graphite

• Sodium chloride

• Diamond

• Silicon dioxide

Tags

NGSS.HS-PS1-1