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ZanzabumX [31]
2 years ago
11

What is a control group?

Chemistry
2 answers:
kkurt [141]2 years ago
7 0

Answer:

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

Explanation:

The purpose of a control group is to ensure that the independent variable you are testing is really causing the outcomes in the experimental group.

zalisa [80]2 years ago
3 0

Answer: D

Explanation:

A control group is the variable that remains constant throughout the whole experiment

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12. Draw an energy curve for a chemical reaction that begins at 30 kj and has an activation energy of
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  • <em>Since the activation energy is 50kJ , we need to supply it  50kJ from 30kJ to make it 80kJ .</em>
  • Diagram attached in the file .

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What is the exact mass of one mole of carbon-12 atoms
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One atom of carbon weighs exactly 12/6.022x10^23 = 1.9927x10^-23 grams<span>.</span>
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3 years ago
I have to do this for homework please help :)
kramer

Answer:

1..... nucleus

2......electron cloud

3.......protons

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3 years ago
Calculate the standard cell potential given the following standard reduction potentials: Al3++3e−→Al;E∘=−1.66 V Cu2++2e−→Cu;E∘=0
Maru [420]

Answer:

Explanation:

To calculate the cell potential we use the relation:

Eº cell = Eº oxidation + Eº reduction

Now in order to determine which of the species is going to be oxidized, we have to remember that the more the value of the reduction potential is negative,  the greater its tendency to be oxidized is. In electrochemistry we use the values of the reductions potential in the tables for simplicity  because the only thing we need to do is change the sign of the reduction potential for the oxized species .

So the species that is going to be oxidized is the Aluminium, and therefore:

Eº cell = -( -1.66 V ) + 0.340 V =  5.06 V

Equally valid is to write the equation as:

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These two expressions are equivalent, choose the one you fell more comfortable but be careful with the signs.

3 0
2 years ago
20.00 g of aluminum (al) reacts with 78.78 grams of molecular chlorine (cl2) all of each reactant is completely consumed and a s
marysya [2.9K]

The mass of the product is <em>98.78 g.</em>

The word equation is

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If each reactant is completely consumed, the <em>Law of conservation of Mass </em>tells us the mass of the product must be 98.78 g.

8 0
3 years ago
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