L2 Matter, Energy and Change

L2 Matter, Energy and Change

Mixtures

is a type of matter that

1 ....... is composed of 2 or more substances that are physically combined

2...... has composition that can change (vary) from one sample to another

3....... can be physically separated into its components

4....... retains the properties of the individual components

Examples of mixture

NaCl (aq) ........ salt water

C6H12O6 (aq) ....... sugar solution

HCl (aq) ......... Hydrochloric acid solution

soil, concrete and air are also mixture

Homogeneous mixture

• the components of the mixture are uniformly and evenly mixed throughout

• sample taken with the same mixture have the same composition

Heterogeneous mixtures

• the components of the mixture are not uniformy mixed throughout

• sample taken with the sample mixture have different composition

Multiple Choice

Which is a mixture of substances?

• Cl_2(g)

• H₂O_(l)

• MgCl_2(s)

• KNO_3(aq)

Multiple Choice

Which is true of a KCl solution?

• It is composed of substances that are chemically combined.

• It is composed of substances that are physically combined.

• It is composed of substances with the same atomic number.

• It is a pure substance.

Multiple Choice

Which are elements?

• A

• B

• C & D

• C

Multiple Choice

When NaNO_3(s) is dissolved in water, the resulting solution is classified as a

• heterogenous compound

• homogeneous compound

• heterogeneous mixture

• homogeneous mixture

Multiple Choice

One similarity between all mixtures and compounds is that both

• are heterogeneous

• are homogeneous

• combine in definite ratio

• consist of two or more substances