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3 years ago

A group of students obtained the following data while trying to determine the effect of exercise on pulse rate.

Chemistry

1 answer:

ser-zykov [4K]3 years ago

7 0

Answer:

The answer is A

Explanation: They can pick and chose what kind of exercise there is as well as change it.

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Explain why copper is used for the<br> roofs of some buildings and magnesium is not.

Scrat [10]

Answer:

Because of the less reactivity of copper.

Explanation:

As well as being resistant to the elements and thereby less likely to be affected by rainfall, hail, and mildew than other types of roofing, copper is also one of the most fireproof materials available. Copper is also highly resistant to thermal changes and thereby doesn't deteriorate quickly.

Magnesium would also corrode PDQ. Magnesium sheeting would also pose an unacceptably high fire hazard.

3 0

2 years ago

How fast is an airplane traveling that accelerates at a rate of 20 mph per second for 30 seconds?

Nostrana [21]

Should be 600! hope this helps.

6 0

4 years ago

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A mole of cars stacked end to end would stretch back and forth across the United States how many times? Measured length of 1 car

vekshin1

Answer:

i am potato

Explanation:

4444141+5-45458/85*55474

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3 years ago

Which substance absorbs 58.16 kJ of energy when 3.11 mol vaporizes? a)CH4 b)H2S c)CO2 d)NaCl

schepotkina [342]

Answer:

$H_2S$

Explanation:

Given the amount of heat absorbed and the amount of substance in moles, we may calculate the heat of vaporization. Heat of vaporization is defined as the amount of heat per 1 mole of substance required to evaporate that specific substance.

Based on the value of heat of vaporization, we will identify the substance. Firstly, let's calculate the heat of vaporization:

$\Delta H^o = \frac{58.16 kJ}{3.11 mol} = 18.7 kJ/mol$

Secondly, let's use any table for heat of vaporization values for substances. We identify that the heat of vaporization of $H_2S$ is 18.7 kJ/mol

8 0

3 years ago

Calculate the number of moles of Cl atoms in 3.01×1024 formula units of magnesium chloride, MgCl2.

natta225 [31]

Answer: 10 moles
To find how many moles, you need to divide the number of atoms with 6.02 * 10^23. Since every magnesium chloride has two chlorine atoms, you need to multiply it by 2. The calculation would be: 3.01×10^24 * 2 / 6.02 * 10^23= 10 moles

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3 years ago

Read 2 more answers