Unit 1 Matter, density , atomic structure, isotopes.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

Define density.

Back

Density is the mass of an object divided by its volume, typically expressed in g/cm³.

Front

How do you calculate density?

Back

Density = Mass / Volume.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

Convert 4390 to scientific notation.

Back

4.39 x 10³.

Front

What is the density of an object with a mass of 4g and a volume of 2cm³?

Back

Density = 4g / 2cm³ = 2 g/cm³.

Front

What is the significance of significant figures in calculations?

Back

Significant figures indicate the precision of a measurement and help in reporting results accurately.

Front

How do you round numbers to the correct significant figures?

Back

Round to the least number of decimal places of any number in the calculation.

Front

What is the formula for calculating the mass of an object given its density and volume?

Back

Mass = Density x Volume.