Chemistry Patrice final 2023 semester 1 Mr. Newnam

Front

What is the number of sodium (Na) atoms in Na₂CO₃?

Back

2

Front

Write the number 0.00035 in scientific notation.

Back

3.5 X 10^-4

Front

If there is one mole of gas in a container at STP and the volume is increased to 99.2 L, how many moles are in the container?

Back

4.43 moles

Front

What do we call two or more substances mingled together but not chemically combined?

Back

Mixture

Front

How does energy transfer occur when a piece of ice is on hot pavement?

Back

Energy moves from the ground to the ice warming the ice up.

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as exactly 6.022 x 10^23 particles.

Front

What is the formula for calculating the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.

Front

What is STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, which is 0 degrees Celsius and 1 atmosphere pressure.

Front

What is the significance of the coefficient in a balanced chemical equation?

Back

The coefficient indicates the number of moles of each substance involved in the reaction.