Chemical Reactions and Equations

Which information is not conveyed by a balanced chemical equation?

• Physical states of reactants and products

• Symbols and formulae of all the substances involved in a particular reaction

• Number of atoms/molecules of the reactants and products formed

• Whether a particular reaction is actually feasible or not

Chemically rust is

• hydrated ferrous oxide

• only ferric oxide

• hydrated ferric oxide

• none of these

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Both CO2 and H2 gases are

• heavier than air

• colourless

• acidic in nature

• soluble in water

What is the molecular formula for barium chloride?

• BaCl2

• BaCl

• Ba2Cl

• BaCl3

Balance the following chemical equation:

___NaBr + ___Cl2 ----> ____NaCl + ___Br2

Enter the values serially

Reactions in which energy is absorbed are known as _________ reactions.

Tags

NGSS.HS-PS1-4

Oxidation is the loss of electrons from a substance.

• True

• False

The digestion of food in the body is an example of ____________ reaction.

Those reactions, in which two compounds react by an exchange of ions to form two new compounds, are called ________ reactions

A white solid when dropped in water produces a hissing sound. What the solid may be?

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4