HS Science

atomic mass

• total weight of an atom

• total number of atoms present in the system

• total number of protons and neutrons found in the nucleus of an element

• mass of a molecule

Which is NOT a characteristic of a metal?

• shiny, good conductor of heat and electricity

• boils at high temperature

• located on the left side of the periodic table

• easily melted and tunable

Which is a characteristic of metalloid?

• substance that can be easily shaped

• substance that is has properties of both metals and non-metals

• substance made from both liquid and solids

• substance from the bottom rows of the periodic table

True or False

The pH scale goes from 0 to 14 and measures how acidic or basic a substance is

• true

• false

What pH range does an acid have?

• 0-7

• 7-14

• 0-14

• 5-9

A/an _ has a pH higher than 7

• neutral

• catalyst

• base

• acid

What does a catalyst do in a chemical reaction?

• ends the reaction

• slows the reaction down

• speeds the reaction up

• nothing, just observes the reaction

What is the melting point of a substance?

• the temperature where the solid phase of a substance turns to a gas

• the temperature where the liquid phase of a substance turns to a gas

• the temperature where the gas phase of a substance turns to a liquid

• the temperature where the solid phase of a substance turns to a liquid

What is the boiling point of a substance?

• the temperature where a liquid becomes a gas

• the temperature where a solid becomes a gas

• the temperature where a gas becomes a liquid

• the temperature where a liquid becomes a solid

What is the freezing point of a substance?

• The temperature where a liquid becomes a gas

• The temperature where a solid becomes a liquid

• The temperature where a gas becomes a solid

• The temperature where a liquid becomes a solid