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3 years ago

Scientists digging in a cave found an unknown substance. The scientists

Chemistry

1 answer:

Vaselesa [24]3 years ago

6 0

Answer:

By adding heat energy

It changed to gas

Explanation:

A substance whose molecules are moving around each other is a liquid. They are held in shape by very weak intermolecular forces.

For solids, there is no movement because the molecules are held up in a fixed lattice.

Gases molecules moves randomly and independently of one another.

When a liquid is heated and it gains heat energy, it changes phase.
A phase change to gas can be predicted.
This is because there is an increase in the speed of the substances.

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A compound has 50% sulfur and 50% oxygen. what is its empirical formula?

Arte-miy333 [17]

A compound is a combination of a different elements to form a new substance. The new substance may well have different properties to that of the composing elements. When a compound is made of 50% sulphur and 50% oxygen, it's empirical formula is SO (sulphur oxide). In other words, there is one sulphur atom and one oxygen atom - each consists of 50% of the overall molecule.

4 0

4 years ago

Which is the largest in size? OA. A. a star O B. a planet O c. an asteroid D. a galaxy E. a supernova E.

Genrish500 [490]

Answer:

galaxy

Explanation:

galaxy is the largest in size

8 0

4 years ago

Which of the following is a molecular formula for a compound with an empirical formula of CH2O and a molar mass of 150. g/mol.

trapecia [35]

Answer:

C₅H₁₀O₅

Explanation:

Let's consider a compound with the empirical formula CH₂O. In order to determine the molecular formula, we have to calculate "n", so that

n = molar mass of the molecular formula / molar mass of the empirical formula

The molar mass of the molecular formula is 150 g/mol.

The molar mass of the empirical formula is 12 + 2 × 1 + 16 = 30 g/mol

n = (150 g/mol) / (30 g/mol) = 5

Then, we multiply the empirical formula by 5.

CH₂O × 5 = C₅H₁₀O₅

7 0

3 years ago

Which component is necessary in an electrolytic cell but not in a voltaic cell

Brums [2.3K]

A power source, such as a battery.

3 0

4 years ago

Read 2 more answers

Gaseous methane (CH₄) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O) If 0.3

AveGali [126]

Answer : The percent yield of $CO_2$ is, 68.4 %

Solution : Given,

Mass of $CH_4$ = 0.16 g

Mass of $O_2$ = 0.84 g

Molar mass of $CH_4$ = 16 g/mole

Molar mass of $O_2$ = 32 g/mole

Molar mass of $CO_2$ = 44 g/mole

First we have to calculate the moles of $CH_4$ and $O_2$ .

$\text{ Moles of }CH_4=\frac{\text{ Mass of }CH_4}{\text{ Molar mass of }CH_4}=\frac{0.16g}{16g/mole}=0.01moles$

$\text{ Moles of }O_2=\frac{\text{ Mass of }O_2}{\text{ Molar mass of }O_2}=\frac{0.84g}{32g/mole}=0.026moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

From the balanced reaction we conclude that

As, 2 mole of $O_2$ react with 1 mole of $CH_4$

So, 0.026 moles of $O_2$ react with $\frac{0.026}{2}=0.013$ moles of $CH_4$

From this we conclude that, $CH_4$ is an excess reagent because the given moles are greater than the required moles and $O_2$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $CO_2$

From the reaction, we conclude that

As, 2 mole of $O_2$ react to give 1 mole of $CO_2$

So, 0.026 moles of $O_2$ react to give $\frac{0.026}{2}=0.013$ moles of $CO_2$

Now we have to calculate the mass of $CO_2$

$\text{ Mass of }CO_2=\text{ Moles of }CO_2\times \text{ Molar mass of }CO_2$