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-PS1-2

NGSS.HS-PS1-1

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

(a)  

Reactions in which energy is absorbed are known as (a)   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 (a)   reaction.

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

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

(a)  

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4