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mario62 [17]
3 years ago
5

What is allotropy ?​

Chemistry
2 answers:
notsponge [240]3 years ago
5 0
An example of an allotrope is carbon:
Carbon can exist in graphite, diamond and amorphous
stiks02 [169]3 years ago
3 0

Answer:

the existence of two or more different physical forms of a chemical element.

Explanation:

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PH is 7.45. Calculate value of [H3O+] and [OH-]
lana66690 [7]

Answer:

The answer is (H30+) =3,55e-8M and (OH-)=2,82e-7M

Explanation:

We use the formulas:

pH= - log(H30+)  and Kwater=(H30+)x(OH-)

pH= - log(H30+)  ----< (H30+)= antilog- pH=antilog- 7,45=3,55E-8M

Kwater=(H30+)x(OH-)

(OH-)=Kwater/(H30+)= 1,00e-14/3,55e-8 = 2,82e-7

8 0
3 years ago
Which of the following is an irreversible physical change?
Yuliya22 [10]

Answer:

b) sharpening a pencil

Explanation:

If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.

3 0
4 years ago
What reaction is zinc(s) + water(l) →
Marat540 [252]

Answer:

Zn+H2O ------ ZnO + H2 is the correct answer

8 0
3 years ago
Read 2 more answers
I need help please and thank you
Alenkasestr [34]

Answer:

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Explanation:

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3 years ago
Give me lil reasoning so I know your not lying for points
Natali5045456 [20]

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C. Tip had the lower pressure, it was 652.71mmHg

Explanation:

To answer this question you need to convert both values into a common unit so you can compare directly.

87kPa = 652.71 mmHg

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3 years ago
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