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Katyanochek1 [597]
3 years ago
9

The symbol Ca-40 denotes that

Chemistry
1 answer:
Roman55 [17]3 years ago
8 0
D. A calcium atom has mass of 40
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How many atoms are there in 0.655 moles of C6H14?​
3241004551 [841]

Answer: 3.94 x 10^23 molecules

Explanation: hope this helps!

6 0
2 years ago
The reaction A + 2B + C -- >D + 2E is first order in reactant A, first order in B, and second order in C. What is the rate la
kvasek [131]
The answer should be D.  A rate law needs to be rate equaling the rate constant which is represented as k (make sure you use a lower case k since an upper case K is for equilibrium) times the concentrations of each reactant raised to the power of what ever order it has. (if A was a zero order it would be [A]⁰ and if A was third order it would be [A]³).
Do not get the order the reactants are confused with the coefficients in the chemical equation. (just because the reaction has 2B does not mean the rate law will have [B]².  As shown in this example since it is first order therefore being [B] in the rate law)

I hope this helps. Let me know if anything is unclear in the comments.
7 0
3 years ago
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What is the pH of a .000243 M solution of potassium hydroxide solution?
Evgesh-ka [11]
1.03!! Very easy you welcome:)
3 0
3 years ago
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Which of the following is created when solids, liquids, or gases mix together with one another?
gavmur [86]

the correct answer is option ( A ) Mixture

Explanation:

It is defined as the substance that is made by the combination of two or more different components. Or, we can say that it is created when solids liquids or gases mixed with one another. Hence, the correct option is, mixture.

Hope it helps you

Mark my answer as brainlist

have a nice day

8 0
2 years ago
Please help!!!!
Tomtit [17]

Answer 1) Option D : Discrete


Explanation : As in the example the scientist studies about the effects of growing human populations on the biodiversity which is found in a region, and where each region was selected had a different population density of humans from 1 to 10 million per 10 square miles. Then in each region the number of different species that can be found was recorded. So here the numerical data was collected for different regions. So, we can conclude it as discrete because when the variable takes on a countable number of values it is called as discrete.


Answer 2) Option D : The entertainment industry


Explanation : When people had enough time and money with them there was no need of creating the communications industry as it was a need not a luxurious thing. With the creation of Internet industry it is somewhat irrelevant. They had enough of time and money so building a labor industry seems to be a lame choice. So, the option of entertainment industry suits the best.

6 0
3 years ago
Read 2 more answers
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