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3 years ago

How and why does heat affect matter (pls explain thoroughly)

Chemistry

1 answer:

slava [35]3 years ago

4 0

Answer:

Solids, liquids and gases all expand when heat is added

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ...

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propane is a hydrocarbon, a compound composed only of carbon and hydrogen. it is 81.82% carbon and 18.18% hydrogen. what is the

scoundrel [369]

Firstly need to determine the empirical formula of the hydrocarbon. Empirical formula is the simplest whole number ratio of components of the compound. Molecular formula is the actual composition of the components in the compound.

percentage of C - 82.66%

percentage of H - (100-82.66) = 17.34 %

in 100 g of compound ;

mass of C - 82.66 g

mass of H - 17.34 g

C H

mass in 100 g 82.66 g 17.34 g

molar mass 12 g/mol 1 g/mol

number of moles 6.88 mol 17.34 mol

(mass/molar mass)

divide the number of moles by least number of moles (6.88 mol)

6.88 mol/6.88 17.34/6.88

1 2.52

multiply these by 2 to get a whole number

C - 1x 2 = 2

H - 2.52 x 2 = 5.04

round off to nearest whole number

C - 2

H - 5

ratio of C to H is 2:5

empirical formula - C₂H₅

empirical formula mass = 12 g/mol x 2 + 5 * 1 g/mol = 29 g

next have to find how many empirical units are there in the molecular unit

molecular unit mass = 58.12 g

empirical unit = 29 g

then number of empirical units = 58.12 / 29 = 2

rounded off , number of empirical units = 2

(C₂H₅) * 2 units

molecular formula = C₄H₁₀

Explanation:

8 0

3 years ago

What is atomic theory?

shusha [124]

Answer: the theory that all matter us made up of tiny invisible particles. Hope that help you out :)

Explanation:

3 0

3 years ago

Read 2 more answers

250 ml of seawater and we inked each molecule with pink color, then we mixed this 250 ml in the ocean. After mixing you took 250

Marysya12 [62]

Answer:

9.77 × 10⁹ molecules

Explanation:

Since the density of water is 1 g/cm³ = 1000 g/L

So, we find the mass of sea water in 250 mL = 0.250 L

We know density = mass/volume

mass = density × volume = 1000 g/L × 0.250 L = 250 g

Now we calculate the number of moles of sea water in 250 g, 250 mL of sea water.

number of moles n = mass of sea water,m/molar mass of water, M

molar mass of water, M = 18 g/moL

n = m/M = 250 g/18 g/mol = 13.89 mol

We now calculate the number of molecules present in the 250 mL of sea water.

n = N/N' where N = number of molecules, N' = avogadro's number = 6.022 × 10²³/mol

So,N =nN' = 13.89 mol × 6.022 × 10²³/mol = 8.36 × 10²⁴ molecules

Now, the volume of the ocean is 1.337 × 10¹⁸ m³ = 1.337 × 10¹⁵ L

Since the 250 mL sea water is mixed with the ocean, the number of molecules per liter is 8.36 × 10²⁴ molecules/1.337 × 10¹⁵ L = 6.25 × 10⁹ molecules/L

If we now take 250 mL out of the ocean, the number of molecules in this 250 mL will be 6.25 × 10⁹ molecules/L × 250 mL = 6.25 × 10⁹ molecules/L × 0.250 L = 9.77 × 10⁹ molecules.

So, we have 9.77 × 10⁹ molecules of pink molecules in the 250 mL after mixing in the ocean.

6 0

3 years ago

How a river rock layer overtime

IRINA_888 [86]

Answer:

Most of the rocks exposed at the surface of Earth are sedimentary--formed from particles of older rocks that have been broken apart by water or wind. The gravel, sand, and mud settle to the bottom in rivers, lakes, and oceans. These sedimentary particles may bury living and dead animals and plants on the lake or sea bottom. With the passage of time and the accumulation of more particles, and often with chemical changes, the sediments at the bottom of the pile become rock. Gravel becomes a rock called conglomerate, sand becomes sandstone, mud becomes mudstone or shale, and the animal skeletons and plant pieces can become fossils.

8 0

4 years ago

The overall reaction taking place is shown in the equation below

algol [13]

A. The maximum possible mass of sodium that can be produced is 47.18 Kg

B. The percentage yield of the reaction is 80.6%

<h3>Determination of the mass of NaCl and Na </h3>

We'll begin by calculating the mass of NaCl that reacted and the mass of Na obtained from the balanced equation.

2NaCl –> 2Na + Cl₂

Molar mass NaCl = 23 + 35.5 = 58.5 g/mol

Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g = 117 / 1000 = 0.117 Kg

Molar mass of Na = 23 g/mol

Mass of Na from the balanced equation = 2 × 23 = 46 g = 46 / 1000 = 0.046 Kg

SUMMARY

From the balanced equation above,

0.117 Kg of NaCl reacted to produce 0.046 Kg of Na.

<h3>A. How to determine mass of Na produced </h3>

From the balanced equation above,

0.117 Kg of NaCl reacted to produce 0.046 Kg of Na.

Therefore,

120 Kg of NaCl will react to produce = (120 × 0.046) / 0.117 = 47.18 Kg of Na

Thus, the maximum mass of Na produced is 47.18 Kg.

<h3>B. How to determine the percentage yield </h3>

Actual yield = 38.05 Kg
Theoretical yield = 47.18 Kg

Percentage yield =?

Percentage yield = (Actual / Theoretical) × 100

Percentage yield = (38.05 / 47.18) × 100

Percentage yield = 80.6%

Learn more about stoichiometry:

brainly.com/question/14735801

7 0

2 years ago