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Ber [7]
3 years ago
8

since an element always has a different number of protons, the mass can indicate how many neutrons are in an isotope

Chemistry
1 answer:
elena-s [515]3 years ago
8 0

Answer:

The number of protons is equal to the mass number of the element. Since an element always has a different number of protons, the mass can indicate how many neutrons are in an isotope. Atoms of the same element can have a different number of neutrons. There are three naturally-occurring isotopes of carbon.

Explanation:

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The independent variable has control and affects the
Stella [2.4K]

Answer:

The independent variable is the condition that you change in an experiment. It is the variable you control.

Explanation:

It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Sometimes you may hear this variable called the "controlled variable" because it is the one that is changed.

3 0
3 years ago
Read 2 more answers
a solution containing ethylene glycol and water has a vapor pressure of 7.88 torrtorr at 10 ∘c∘c . pure water has a vapor pressu
Nuetrik [128]

Mole fraction of ethylene is = 0.144  

How to find mole fraction ?

As, Given that vapor pressure = 7.88 torr

pure water vapor pressure = 9.21 torr

∆P solvent = (X Solute)(Pº solvent)

∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

Xsolute = mole fraction of the solute = ?

Pºsolvent = vapor pressure of the pure solvent = 9.21 torr

1.33 torr = (Xsolute)(9.21)

Xsolute = 1.33 torr/9.21 torr)

Xsolute = 0.144

Hence the mole fraction of ethylene is = 0.144  

learn more about mole fraction is here :

brainly.com/question/14783710

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3 0
2 years ago
Chemical Reactions/Neutralization Reactions
aliina [53]

Answer:

Hydrochloric acid + sodium hydroxide -> sodium chloride + water

Sulphuric acid + copper hydroxide -> copper sulphate + water

Nitric acid + sodium hydroxide -> sodium nitrate + water

Hydrochloric acid + calcium hydroxide -> calcium chloride + water

Sulphuric acid + potassium hydroxide -> potassium sulphate + water

Hydrochloric acid + lithium hydroxide -> lithium chloride + water

Nitric acid + magnesium hydroxide -> magnesium nitrate + water

7 0
2 years ago
A man with normal lungs and an arterial PO2 of 40 mmHg takes an overdose of barbiturates that halves his alveolar ventilation wi
Colt1911 [192]

Answer:

\frac{4}{5} = \frac{40}{x}

Where x represent the value of interest on this case. And solving for the value of x we have:

x = 40 * \frac{5}{4}= 50 mm Hg

So then the new arterial pressure needs to be now 50 mm Hg to mantain the original level.

And in order to find the concentration we can use a figure called the "O2

-CO2  diagram showing a ventilation-perfusion ratio line. " and when we use this graph to calculate the pressure of Co2 for PO2= 40 mmHg and for Po2=50 mm Hg we got and increase of 0.07 or 7%  

So then the final answer for this case would be an increase of 7%

Explanation:

For this case we know that a man with normal lungs have an arterial Po2 os 40 mm Hg.

Then we know that this man take an overdose of barbiturates thats halves his aveolar ventilation without changing his metabolism

We also know that the respiratory exchange ratio is 0.8 or 8/10

0.8 = \frac{8}{10}= \frac{4}{5}

And we want to find hor much does his inspired oxyden concentration % have to increased to return his avelolar Po2 to the original level.

On this case we can apply a proportion rule and we have this:

\frac{4}{5} = \frac{40}{x}

Where x represent the value of interest on this case. And solving for the value of x we have:

x = 40 * \frac{5}{4}= 50 mm Hg

So then the new arterial pressure needs to be now 50 mm Hg to mantain the original level.

And in order to find the concentration we can use a figure called the "O2

-CO2  diagram showing a ventilation-perfusion ratio line. " and when we use this graph to calculate the pressure of Co2 for PO2= 40 mmHg and for Po2=50 mm Hg we got and increase of 0.07 or 7%  

So then the final answer for this case would be an increase of 7%

7 0
3 years ago
How can you get the knowledge of minerals chemical makeup or use?
Gre4nikov [31]

A. To determine how to break down minerals


7 0
3 years ago
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