Question

15 PTS!!! PLEASE HELP ASAP I REALLY DONT UNDERSTAND IT! BRAINLIEST!

Answer 1

1- The answer is:

Cereal

The explanation:

because cereal contains many sizes and different volumes which make the mixture hardly to be separated or separated evenly.

when the heterogeneous mixture is a not uniform components and have a different properties even if it is at the same state or phase of matter, and the heterogeneous mixture contains two or more phases (gas or liquid or solid ) mixture together.

and here all the above choice are homogeneous mixture have a uniformly distributed in the mixture , except the cereal.

2- The answer is:

 True

The explanation:

because the heterogeneous mixtures can be physically separated into their individual components by many processes:

-when we want to separate a solid which is suspended in a liquid we can use filtration, also also when there is a more dense solid we can use a centrifuge method and the solid become at the bottom.

- and when there is a metal which affected by a magnet so, we can separate by magnet.

- also we can separate a liquid from a solid by evaporate the liquid and the solid remains.

3- The answer is:

a) Colloid is a microscopically insoluble particles that are suspended throughout another substance

.

for example a silt or clay in water , it represents here a colloids.

b) Emulsions is two or more liquids that are normally not mixable.

For example a crema when it use with the espresso.

c) solution is a solute that is distributed evenly within the solvent.

for example when the water mix with salt and for salt water solution.

D)Homogeneous is a mixture that has its different components mixed evenly within the substance.

For example the air , here the components are in a uniform distributed in this mixture.

4- The answer is:

Apply pressure is can be used to separate a homogeneous mixture into its component parts.

The explanation:

because when the mixture is a homogeneous that means its components is in a uniform distributed in this mixture so, we can't use size or even color in the separation methods or magnet , but we can use apply pressure method for example in the gas separation .

5- The answer is:

It was a heterogeneous mixture

The explanation:

because we use the centrifuge method to separate the dense solid which suspended in liquid by settle at the bottom of the centrifuge tube, and the heterogeneous mixture is define as a mixture which its components are always have two phases of state of matter (liquid, solid, gas) ,here we should have solid and liquid to use centrifuge and the other choices not.

6- The answer is:

a pure substance are mixed unevenly instead of evenly within the pure substance as The components of a pure substance are single elements or compounds instead of a mixture of compounds.

The explanation:

because the pure substance is define how the substance is pure and show one component or one atom or one type of substance . it is homogeneous at all , but the heterogeneous mixture has a different components with different state of matter with a not uniform distributed.

Answer 2

1) Answer is: a) Cereal.

Silver (Ag) and nickel (Ni) are pure substances (elements), shampoo is homogeneous mixture.

Heterogeneous mixture is not uniform in composition (in this mixture different grains), but proportions of its components (in this mixture grains of different colors and size) vary throughout the sample.

A heterogeneous mixture have compounds that remain separate in the sample.

2) Answer is: true.

For example, separation of heterogeneous mixture of the salt dissolves in water, charcoal and iron filings. There are three phases of matter (homogeneous solution od salt and water, iron and charcoal).

1) First separate iron filings by using the magnet, because iron is magnetic substance.

2) Then separate charcoal by filtration, passing the remaining mixture (water, salt, charcoal) through the filter paper.

3) Homogeneous solution of salt and water can be separated with heating (evaporating the water).

3) Answer is:

1) Colloid  - A) Microscopically insoluble particles that are suspended throughout another substance. For example whipped cream and gelatin,

2) Emulsions  - C) Two or more liquids that are normally not mixable. For example egg yolk and mayonnaise.

3) Solution - D) A mixture that has its different components mixed evenly within the substance. For example solution of salt and water or sugar and water.

4) Homogeneous - B) A solute that is distributed evenly within the solvent.

4) Answer is: a) Apply pressure .

For example, gas separation is technique used to separate gases with pressure.

Homogeneous mixture has the same proportions of its components throughout any given sample and it is composed of two or more substances.

We can not separate components by color and size, because homogeneous mixture is uniform, it has same color and size throughout the sample.

5) Answer is: c) It was a heterogeneous mixture.

This technique is also used for homogeneous mixtures.

Centrifugation is a technique using centrifugal force to separate particles from a mixture according to their size, shape and density.

The principle is that the denser particles are forced to the bottom and the lighter particles stay at the top.

6) Answer is: d) The components of a pure substance are single elements or compounds instead of a mixture of compounds.

Pure substance is made of only one type of atom (element) or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.