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erma4kov [3.2K]
4 years ago
15

How is a mixture different from a chemical reaction?

Chemistry
1 answer:
GrogVix [38]4 years ago
5 0

Answer:

A mixture is made when two or more substances are combined, but they are not combined chemically. A chemical reaction is a transformation from one set of chemicals into another set.

Explanation:

A mixture can be homogeneous or heterogeneous, when homo, you cannot see each variable but hey are there. Hetero, means you can see each variable in the mixture. It is considered a mixture and not a chemical reaction because it can be reversed. It will always be able to go back to its separate forms and keep its original composition. When there is a chemical reaction, it is hard to separate and go back to the original variables because there is a molecular bond.

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The volume of a gas is 2250 mL at 290 kPa what will the volume be when the pressure is reduced to .9 atm
leva [86]

Answer:

7178.22 mL

Explanation:

Applying,

PV = P'V'................. Equation 1

Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.

make V' the subject of the equation

V' = PV/P'.............. Equation 2

From the question,

Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa

Substitute these values into equation 2

V' = (2250×290)/90.9

V' = 7178.22 mL

4 0
3 years ago
The atomic weight of boron is reported as 10.81, yet no atom of boron has the mass of 10.81 amu. explain
aivan3 [116]
<span>Boron has a lot of different isotopes, most of which having a very short half life (ranging from 770 milliseconds for Boron-8 down to 150 yoctoseconds for boron-7). But the two isotopes Boron-10 and Boron-11 are stable with about 80.1% of the naturally occurring boron being boron-11 and the remaining 19.9% being boron-10. The weighted average weight of those 2 isotopes has the value of 10.81. The reason they use the average mass of an element for it's atomic weight is because elements in nature are rarely single isotopes. The weighted average allows us to easily compare relative number of atoms of one element against relative numbers of atoms of another element assuming that the experimenters are getting isotope ratios close to their natural ratios.</span>
7 0
3 years ago
A 14 year old girl is small in stature and appears younger than her age. She has not started menstruating, and her parents are c
Anestetic [448]

Answer:

A.

B.

Explanation:

8 0
3 years ago
Solution 1 contains 3.5g of sodium chloride in 500 mL of water. Solution 2 contains 7.5g of glucose in 300 mL of water. If the a
meriva

Answer:

Answer is Object 2 (which has a density of 1.9 g/cm³).

Explanation;

   When object is floating, the weight of that object is less than the up thrust on it.

   When an object fully submerged and floating, then the weight of that object is equal to the up thrust on it.

   This is known as the Archemide's principle.

   Both up thrust and weight depends on the density. Hence, if the density of the solution is high, then the up thrust also high. If the density high, the the weight of the object also high.

   Hence, to sink the object in water, that object should be denser than water. Hence, answer is object 3 which has a higher density than water.

Explanation:

8 0
3 years ago
Why does asexual reproduction result in offspring with identicle genetic variation
iris [78.8K]
There is only one parent so the genes don’t change.
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3 years ago
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