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3 years ago

What is a way of transforming energy by exerting a force over distance?

Chemistry

2 answers:

xz_007 [3.2K]3 years ago

8 0

Answer:

a. Work

Explanation:

If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion.

Rufina [12.5K]3 years ago

3 0

Work

if you apply a force over a given distance - you have done work

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Determine the empirical formulas for compounds with the following percent compositions:

White raven [17]

Answer: a) $CS_2$

b) $CH_2O$

Explanation:

a) If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 15.8g

Mass of S= 84.2 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{15.8g}{12g/mole}=1.32moles$

Moles of S= $\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{84.2g}{32g/mole}=2.63moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{1.32}{1.32}=1$

For S = $\frac{2.63}{1.32}=2$

The ratio of C : S = 1:2

Hence the empirical formula is $CS_2$

b) Mass of C= 40 g

Mass of H= 6.7 g

Mass of O = 53.3 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{40g}{12g/mole}=3.33moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{6.7g}{1g/mole}=6.7moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{53.3g}{16g/mole}=3.33moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{3.33}{3.33}=1$

For H = $\frac{6.7}{3.33}=2$

For O = $\frac{3.33}{3.33}=1$

The ratio of C : H: O= 1 :2: 1

Hence the empirical formula is $CH_2O$

5 0

3 years ago

1. If a person's mass is 56 kg, what is this weight in pounds?<br> 56kg

Natali [406]

Answer:

123lb

Explanation:

lb= 2.2046 kg

56×2.2046= 123lb

3 0

3 years ago

A scientist collected a sample of sedimentary rock from a high elevation in the Himalaya Mountains. Using what he knows about th

alina1380 [7]

Answer: Pressure from when the mountain formed creates the sedimentary rock.

Explanation: it’s prob wrong but i’m taking the test rn and this is my best guess

4 0

3 years ago

tester [92]

Some of the similarities between weather and climate include how both refer to temperature and how they are not always the same everywhere. In addition, the weather and climate intersect in various ways, for example the climate dictates the weather in various locations.

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3 years ago

Zn + Cut2 Zn+2 + Cu<br> please help lol

Anna35 [415]

Answer:

That's easier for you to come over and watch the answer to the question

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3 years ago