8th QBA3 Review SC.8.P.8.5;SC.8.P.8.9;SC.8.P.8.6;SC.8.P.8.7

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the chemical formula for glucose?

Back

C6H12O6

Front

What happens to the number of valence electrons as you move from left to right across a period in the periodic table?

Back

The number of valence electrons increases.

Front

What is the atomic radius?

Back

The atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

What is the result of sodium metal reacting with water?

Back

Sodium metal reacts with water to produce sodium hydroxide (NaOH) and hydrogen gas (H2).

Front

Which metal reacts violently with water similar to sodium?

Back

Potassium (K) reacts violently with water.

Front

How do the properties of water and hydrogen peroxide differ despite both being made of hydrogen and oxygen?

Back

The number of atoms of each element is different in water (H2O) and hydrogen peroxide (H2O2).

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Front

What is the significance of the number of protons in an atom?

Back

The number of protons determines the element's identity and its position on the periodic table.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numbers to indicate the ratio of atoms.