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andreyandreev [35.5K]
3 years ago
5

Why is it important to have a control group in an experimental investigation?

Chemistry
2 answers:
Alika [10]3 years ago
8 0

Answer:

Its C pn ed

Explanation:

Karolina [17]3 years ago
3 0
To compare the results when the independent variable is not involved
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Answer:

propagation of disturbances—that is, deviations from a state of rest or equilibrium—from place to place in a regular and organized way. Most familiar are surface waves on water, but both sound and light travel as wavelike disturbances, and the motion of all subatomic particles exhibits wavelike properties.

Explanation:

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Express the rate of the reaction in terms of the change in concentration of each of the reactants and products.
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Answer:

c. rate=−1/2Δ[HBr]/Δt=Δ[H2]/Δt=Δ[Br2]/Δt

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

2HBr(g)\rightarrow H_2(g)+Br_2(g)

Thus, the rate is given as:

rate=-\frac{1}{2} \frac{\Delta [HBr]}{\Delta t}=\frac{\Delta [Br_2]}{\Delta t} =\frac{\Delta [H_2]}{\Delta t}

It is necessary to remember that each concentration to time interval is divided into the stoichiometric coefficient, that is why HBr has a 1/2. Moreover, the concentration HBr is negative since it is a reactant and it has a negative rate due to its consumption.

Therefore, the answer is:

c. rate=−1/2Δ[HBr]/Δt=Δ[H2]/Δt=Δ[Br2]/Δt

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3 years ago
A solution contains 11% by mass of sodium chloride. this means that __________.
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As a solution is contained with 11% by mass of sodium chloride, this will therefore conclude that the 100g of the solution is composed of the 11g of the sodium chloride. In which, the correct answer would be specified as letter c.

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The compound fes is an example of a(n) element ionic compound covalent compound atom
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