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Nataliya [291]
3 years ago
14

What is the difference between elements, mixtures, and compounds?

Chemistry
1 answer:
MAXImum [283]3 years ago
6 0

Answer:

If it is pure, the substance is either an element or a compound. If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture.

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What is the significance of the fact that chromosomes condense before they are moved.
natka813 [3]

Answer:

It allows for easier division of the sister chromatids into two identical chromosomes, one for each cell, and helps to prevent mistakes. You just studied 2 terms!

Explanation:

7 0
3 years ago
Coal like graphite is composed of carbon. Unlike graphite, coal is formed by decayed, once living matter. Is it a mineral?
Simora [160]
Coal is not a mineral. It's not a mineral because minerals are inorganic. Coal is organic because it comes from decayed living matter. 
3 0
3 years ago
How many years of chemistry do i need to get a deggre in marine biology
tatiyna

2 to 4. Im pretty sure you might have to check me on it but as far as i know 2 to 4 years.

Best regards,

<u><em>Morgan T. Malice</em></u>

7 0
3 years ago
Concerning the rate law, Rate = K[A]²[B], what are appropriate units for the rate<br> constant k?
vovikov84 [41]

The correct answer is M^-1s^-1.

The proportionality constant in the rate law expression, known as the rate constant or the particular rate constant, represents the relationship between the rate of the reaction and the concentration of the reacting species. Because it equals the rate of the reaction when the concentration of the reactants is assumed to be unity, it is known as the specific rate constant. The speed and direction of a chemical reaction are measured by a reaction rate constant. We are aware that the values of the Rate constant vary with temperature.

The given rate law is:

Rate = k[A][B]

The units of rate are always Ms^-1 and the units of [a] are mol so: mol*s^-1

Putting the units in the given rate law:

Rate = k[A][B]

Ms^-1=k×(M)×(M)

k=Ms^-1/M^2

k=M^-1s^-1

To learn more about  rate law refer the link:

brainly.com/question/14779101

#SPJ9

3 0
2 years ago
If a sample of DNA contained 20% cytosine, what percentage of guaninewould be in this sample and what percentage of adenine woul
timofeeve [1]
Guanine and Cytosine are complementary pairs in the DNA molecule (which means that Cytosine is bonded via hydrogen bonds to Guanine).  This is the same for Adenine and Thymine.  As such if a sample of DNA contains 20% Cytosine then it also contains approximately 20% Guanine.

The percentage of Thymine + Adenine would be 100% - 40% = 60%... Since this 60% should be equally shared between Thymine and Adenine then it implies that the percentage Adenine would be approximately 30%.
7 0
3 years ago
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