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Likurg_2 [28]
3 years ago
9

What is the percent composition of calcium fluoride

Chemistry
1 answer:
vladimir1956 [14]3 years ago
8 0

Answer:

78.07

Explanation:

them seperatly is

Calcium Ca 51.333%

Fluorine F 48.667%

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Which of these is an indication that a chemical reaction has occurred? (boiling of a substance ,freezing of a substance, formati
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Answer:

Boiling of a substance

Explanation:

When something is boiled, heat is released to the surrounding, making it an exothermic reaction (a type of chemical reaction)

8 0
3 years ago
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A piece of unknown metal weighs 348g. When the metal piece absorbs 6.64kj of heat , its temperature increases from 24.4C to 43.6
Morgarella [4.7K]

Answer:

This metal could be the aluminium with a specific heat of H = 993 \frac{J}{kgC}

Explanation:

A pie of unknown metal presents a mass (M) of 348 g. This metal is heated using energy (E) of 6.64 kJ and the temperature increases from T1 =24.4 to T2 =43.6°C. We can calculate the specific heat (H) of this metal as follows

H = \frac{E}{M*(T2-T1)}

We can replace previously presented data in this equation. After simplifying and converting to adequated units, we found that

H = \frac{6640 J}{0.348 Kg*(43.6-24.4) C} =\frac{6640 J}{6.686 KgC}

Finally, the specific heat of this metal is

H = 993 \frac{J}{kgC}

The aluminium could be the metal, its specific heat is similar to that found in this problem.

Finally,  we can conclude that this metal could be the aluminium with a specific heat of H = 993 \frac{J}{kgC}

7 0
3 years ago
Using the two models, compare the processes of nuclear fusion and nuclear fission. What do the two processes have in common?
EleoNora [17]

Answer:it’s A and B

Explanation:

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3 years ago
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Which of the following is a type of cell organelle?
icang [17]

Answer:

C . Dna

Explanation:

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Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th
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Answer:

it is 50%

Explanation:

62.9x50=3145

64.9x50=3245

3245+3145=6390

6390/100=63.9

4 0
3 years ago
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