15 !asap i really dont understand it! brainliest!
question 1(multiple choice worth 3 points)

(03.06 mc)

which substance is a heterogeneous mixture?

a) cereal
b) silver
c) nickel
d) shampoo

question 2 (true/false worth 2 points)

(03.06 lc)

heterogeneous mixtures can be physically separated into their individual components.

true
false

question 3 (matching worth 4 points)

(03.06 lc)

match the mixture with its description.

1)colloid
2)emulsions
3)solution
4)homogeneous

a) microscopically insoluble particles that are suspended throughout another substance

b) a solute that is distributed evenly within the solvent

c) two or more liquids that are normally not mixable

d) a mixture that has its different components mixed evenly within the substance

question 4(multiple choice worth 3 points)

(03.06 lc)

which of the following techniques can be used to separate a homogeneous mixture into its component parts?

a) apply pressure
b) sort by color
c) sort by size
d) use magnetism

question 5(multiple choice worth 4 points)

(03.06 mc)

a centrifuge was used to separate a sample into its components. what conclusion about the sample can be formed based on the technique used?

a) it was a pure substance.
b) it was a compound.
c) it was a heterogeneous mixture.
d) it was a homogeneous mixture

question 6(multiple choice worth 4 points)

(03.06 mc)

what makes a pure substance different from a heterogeneous mixture?

a) the components of a pure substance are mixed unevenly instead of evenly within the pure substance.

b) insoluble instead of soluble particles are suspended within the pure substance.

c) two liquids that normally are not mixable are mixed in a heterogeneous mixture.

d) the components of a pure substance are single elements or compounds instead of a mixture of compounds.

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.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml