Quick check before WA2 Sec 2 G2

Choose all that are correct observations when gas being formed from a chemical reaction in acid solution:

• Bubbles formed

• Gas formed

• White ppt formed

• Lighted splint extinguished with a 'pop' sound

Choose all that are correct observations when Universal Indicator is added to an alkali:

• Turns purple

• Green Universal Indicator turns purple

• Alkali turns from colourless to purple

• Solution turns purple

When solutions of acid and alkali are mixed, ___________ happens.

• Neutralization

• Thermal decomposition

• Oxidation

• Combustion

When acid is added to sodium carbonate, the gas that is produced is

When iron is added to some nitric acid, __________ gas is produced.

Red litmus paper is dipped into an unknown solution, and the paper turns blue. The solution must be

• alkaline

• acidic

• water

• salt solution

Blue litmus paper stays blue when it is dipped into a colourless liquid.

Choose all that may be the liquid's identity.

• sodium hydroxide

• water

• salt solution

• hydrochloric acid

An unknown gas is carbon dioxide if it forms a white precipitate in ______________.

The meniscus of the liquid in a measuring apparatus must be read at ________________.

____________ must be worn at all times when conducting experiments in the Chemistry lab, especially during mixing and heating.