chemistry quiz

What is Chemistry?

What contribution did Democritus make?

Baking soda is the common name for sodium bicarbonate, or NaHCo3. It can be produced through chemical reactions involving carbon dioxide and sodium hydroxide.

• pure substance

• element

Chicken noodle soup

• Homogeneous mixture

• Heterogeneous mixture

Mass is measured in__________

Gas is the ________ state of matter.

• first

• second

• third

Coffee grounds can be separated from the solution by......

• sublimation

• evaporation

• sieving

• filtration

Explain how winnowing works.

sublimation

• Ammonium chloride can be separated from a mixture of salt as it will change into a gaseous state.

• Used to separate a dry mixture which has different sizes with the help of one device.

• Only can be used when the solid is insoluble in the liquid and forms a heterogenous mixture.

• Not suitable for a large scale of mixtures and only applicable when the substances are visibly different in size, shape or colour.

How many times is Sulphur heavier than 1/12 of one Carbon-12 atom?

• 23 times

• 32 times

• 12 times

• 31 times