Balance chemical equations

Front

Is the equation Al + O2 ---> 2Al2O3 balanced?

Back

No

Front

During a chemical reaction, atoms ________. Options: can appear, can disappear, get rearranged, stop moving and vibrating.

Back

get rearranged

Front

Why is the following chemical equation not balanced?
H_{2 +} O₂ --> H₂O

Back

Each side of the equation has a different number of oxygen atoms.

Front

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

Back

Reactants

Front

What is the left part of a chemical equation called? 2H2 + O2 ---> 2H2O

Back

reactants

Front

Atoms of aluminum on each side of the equation: 4Al + 3O₂ --> 2Al₂O₃

Back

4

Front

What is the right part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

Back

Products

Front

How many oxygen atoms are present in 4Ca(OH)₂?

Back

8

Front

The small numbers in a chemical formula: (the BLUE numbers)

Back

Subscripts

Front

Balance this equation: H2 + Cl2 ---> HCl

Back

H2 + Cl2 ---> 2HCl