Chemistry Assessment

Water exists in which states at room temperature

• Solid and gas

• Solid and liquid

• Solid, liquid and gas

• Liquid and gas

What is the chemical formula for water

• H2O2

• HO

• H2O

• O2H

Which gas is the most abundant in Earth's atmosphere

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which element is present in all acids

• Hydrogen

• Oxygen

• Carbon

• Nitrogen

What is the percentage by mass of sodium hydroxide ( Na 23, O 16, H 1)

• 40.0%

• 42.5%

• 57.5%

• 73.0%

Element are arranged in the periodic table in order of ?

• Decreasing oxidation number

• Decreasing electronegativity

• Increasing atomic number

• Increasing atomic mass

Element in the same group in the periodic table have ........

• The same number of valency eletrons

• The same number of electron shell

• Different chemical behavior

• The same atomic size

Electrovalent bonding is also known as .........

• Metallic bonding

• Coordinate bonding

• Ionic bonding

• Hydrogen bonding

The element with atomic number 3, have similar chemical properties as the element with atomic number .......

• 5

• 6

• 8

• 11

A substance with two or more elements chemically joined together is ........

• Mixture

• Compound

• Atom

• Element