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olga2289 [7]
2 years ago
13

I need a Help plz! It’s my final exam!

Chemistry
1 answer:
LekaFEV [45]2 years ago
7 0
Um i think gold... i think?
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The steps in every scientific investigation must_______________________.
Marizza181 [45]

Answer:

B. begin with a hypothesis

Explanation:

6 0
3 years ago
An element's atomic number is 60. How many protons would an atom of this element have? __protons
Lady_Fox [76]
If an an element has an atomic number of 60, then there would me 60 protons.
Something that helps me is APE.
The atomic number is the same as the number of protons and electrons.
3 0
3 years ago
0.023 M solution of perchloric acid
kogti [31]
The original question is to find the pH and the pOH of 0.023 M of perchloric acid.

Answer:
pH = 1.638
pOH = 12.362

Explanation:
1- getting the pH:
pH can be calculated using the following rule:
pH = -log[H+]
Since the given solution is an acid, this means that [H+] is the same as the concentration of the solution.
This means that:
[H+] = 0.023
Substitute in the above equation to get the pH as follows:
pH = -log[0.023]
pH = 1.638

2- getting the pOH:
We know that:
pH + pOH = 14
We have calculated that pH = 1.638.
Substitute in the above equation to get the pOH as follows:
pOH + 1.638 = 14
pOH = 14 - 1.638
pOH = 12.362

Hope this helps :)
5 0
3 years ago
What is the name of this compound
lys-0071 [83]

Answer:

horizontal

Explanation:

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2 years ago
Helium is the___
s344n2d4d5 [400]

Answer:

the answer is B-2nd; stars

Explanation:

7 0
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