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3 years ago

5

Which statement is true? Energy cannot be created or destroyed. Energy can be destroyed but not created. Energy can be created b

ut not destroyed.

2 answers:

vaieri [72.5K]3 years ago

6 0

Energy can not be created and cannot be destroyed
<span />

Kryger [21]3 years ago

5 0

Energy is neither created or destroyed, so your answer would be A. Energy is not created or destroyed. Hope this helps

You might be interested in

Hydrogen is 99% 1H, 0.8% 2H, and 0.2% 3H. Calculate its average atomic mass.

AlekseyPX

The average atomic mass of hydrogen (99% H-1, 0.8% H-2, and 0.2% H-3) is 1.012 amu.

The average atomic mass of hydrogen can be calculated with the following equation:

$A = m_{H-1}\%_{H-1} + m_{H-2}\%_{H-2} + m_{H-3}\%_{H-3}$

Where:

$m_{H-1}$ : is the mass of protium (H-1) = 1

$m_{H-2}$ : is the <em>mass</em> of deuterium (H-2) = 2

$m_{H-3}$ : is the <em>mass </em>of tritium (H-3) = 3

$\%_{H-1}$ : is the abundance percent of H-1 = 99%

$\%_{H-2}$ : is the <em>abundance percent</em> of H-2 = 0.8%

$\%_{H-3}$ : is the <em>abundance percent</em> of H-3 = 0.2%

The average atomic mass is:

$A = 1*99\% + 2*0.8\% + 3*0.2\%$

Changing all the <u>percent values</u> into <u>decimal ones</u>, we have:

$A = 0.99 + 2*0.008 + 3*0.002 = 1.012$

Therefore, the average atomic mass of hydrogen is 1.012 amu.

Learn more about average atomic mass here brainly.com/question/8575403?referrer=searchResults

I hope it helps you!

6 0

2 years ago

Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atom

Travka [436]

Answer:

Sr

Explanation:

7 0

3 years ago

Read 2 more answers

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Alina [70]

Answer:C

Explanation:

3 0

3 years ago

A 8.96-L sample of gas has a pressure of 1.86 atm and a temperature of 94 °C. The sample is allowed to expand to a volume of 11.

Varvara68 [4.7K]

Answer:

Explanation:

Explanation:

All you have to do here is use the ideal gas law equation, which looks like this

P

V

=

n

R

T

−−−−−−−−−−

Here

P

is the pressure of the gas

V

is the volume it occupies

n

is the number of moles of gas present in the sample

R

is the universal gas constant, equal to

0.0821

atm L

mol K

T

is the absolute temperature of the gas

Rearrange the equation to solve for

T

P

V

=

n

R

T

⇒

T

=

P

V

n

R

Before plugging in your values, make sure that the units given to you match those used in the expression of the universal gas constant.

In this case, the volume is given in liters and the pressure in atmospheres, so you're good to go.

Plug in your values to find

T

=

3.10

atm

⋅

64.51

L

9.69

moles

⋅

0.0821

atm

⋅

L

mol

⋅

K

T

=

251 K

−−−−−−−−−

The answer is rounded to three

8 0

3 years ago

A student compares the boiling point of substances having different intermolecular forces. Which dependent variable did the stud

maks197457 [2]

Boiling point

Explanation:

The likely dependent variable the student used in this experiment is boiling point temperature

The amount of heat supplied will determine when a substance will boil or not based on the intermolecular force in them.

In an experiment, the dependent variable is treated as the effect produced.
It is the variable that relies on the outcome of the experiment.
The independent variable is responsible for the changes in the experiment.
The cause is the independent variable. It does not rely on the outcome of the experiment.
The dependent variable is the boiling point.
The independent variable is the amount of heat supplied or temperature changes.

learn more:

Experiments brainly.com/question/5096428

#learnwithBrainly

3 0

4 years ago