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3 years ago

Which of the following statements are true?

Chemistry

1 answer:

GarryVolchara [31]3 years ago

7 0

Answer:

b, c,d

Explanation:

b. There are gas molecules that move faster than the average.

c. All the gas molecules in a sample cannot have the same kinetic energy.

d. The average kinetic energy of gas molecules increase with increasing temperature.

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Which of the following is NOT a property of bases? Which of the following is NOT a property of bases? Bases dissolve many metals

Hitman42 [59]

Bases dissolve many metals.

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3 years ago

Which is a fossil fuel?<br> A.nuclear<br> B.Biomass<br> C.geothermal<br> D.coal

Nat2105 [25]

Answer:

Coal

Explanation:

Coal is composed of the remains of dead animals and plants, being pressed down over the course of thousands of years.

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3 years ago

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How is the molarity affected if some solution splashes out of the flask during titration?

Jobisdone [24]

Answer:

not affected?

Explanation:

pretty sure M / concentration isn't affected, only volume.

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3 years ago

4. Magnesium and oxygen undergo a chemical reaction to

erastovalidia [21]

Answer:

About 16.1 grams of oxygen gas.

Explanation:

The reaction between magnesium and oxygen can be described by the equation:
$\displaystyle 2\text{Mg} + \text{O$_2$} \longrightarrow 2\text{MgO}$

24.4 grams of Mg reacted with O₂ to produce 40.5 grams of MgO. We want to determine the mass of O₂ in the chemical change.

Compute using stoichiometry. From the equation, we know that two moles of MgO is produced from every one mole of O₂. Therefore, we can:

Convert grams of MgO to moles of MgO.
Moles of MgO to moles of O₂
And moles of O₂ to grams of O₂.

The molecular weights of MgO and O₂ are 40.31 g/mol and 32.00 g/mol, respectively.

Dimensional analysis:

$\displaystyle 40.5\text{ g MgO} \cdot \frac{1\text{ mol MgO}}{40.31\text{ g MgO}} \cdot \frac{1\text{ mol O$_2$}}{2\text{ mol MgO}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}$

In conclusion, about 16.1 grams of oxygen gas was reacted.

You will obtain the same result if you compute with the 24.4 grams of Mg instead:

$\displaystyle 24.4\text{ g Mg}\cdot \frac{1\text{ mol Mg}}{24.31\text{ g Mg}} \cdot \frac{1\text{ mol O$_2$}}{1\text{ mol Mg}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}$

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2 years ago

Which subatomic particles are found in the nucleus of an atom of beryllium?

larisa86 [58]

Protons and Neutrons

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3 years ago