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2 years ago

Why does liquid move like it does when heated on the right side?

1 answer:

7 0

Answer:Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.

Explanation:Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

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4. Describe the movement of the water molecules at cold temperatures.

kenny6666 [7]

Answer:

Point out to students that molecules of hot water are moving faster and are slightly further apart. The molecules of cold water are moving slower and are a little closer together. If students do not notice a difference, move the slider all the way to the left again and then quickly to the right.

2. How do molecules move in cold water?

Compare the speed of molecules in hot water compared to molecules in cold water? Water molecules move faster in hot water and slower in cold water. water molecules in cold, room temperature, and hot water. most of the liquid.

3 0

2 years ago

A 1.0 g sample of hydrogen reacts completely with 19.0 g of fluorine to form a compound of hydrogen and fluorine. a. What is the

Rashid [163]

Explanation:tr

a) Molar mass of HF = 20 g/mol

Atomic mass of hydrogen = 1 g/mol

Atomic mass of fluorine = 19 g/mol

Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{Molar mass of compound }}\times 100$

Percentage of fluorine:

$\frac{1\times 19 g/mol}{20g/mol}\times 100=95\%$

Percentage of hydrogen:

$\frac{1\times 1g/mol}{20 g/mol}\times 100=5\%$

b) Mass of hydrogen in 50 grams of HF sample.

Moles of HF = $\frac{50 g}{20 g/mol}=2.5 mol$

1 mole of HF has 1 mole of hydrogen atom.

Then 2.5 moles of HF will have:

$1\times 2.5 mol=2.5 mol$ of hydrogen atom.

Mass of 2.5 moles of hydrogen atom:

1 g/mol × 2.5 mol = 2.5 g

2.5 grams of hydrogen would be present in a 50 g sample of this compound.

c) As we solved in part (a) that HF molecules has 5% of hydrogen by mass.

Then mass of hydrogen in 50 grams of HF compound we will have :

5% of 50 grams of HF = $\frac{5}{100}\times 50 g=2.5 g$

8 0

3 years ago

The population of worms in a garden ecosystem is decreasing. The population of birds will most likely _____.

Semenov [28]

Answer:

The population of birds would Decrease

Explanation:

A birds main source of food include: Insects, worms, and grubs. Seeds, grasses, and plant material. Nectar and pollen

It also depends on what bird it is but with any species if there main source of food decrease then they decrease or move out of the area.

Hope this helps

3 0

2 years ago

This is a easy question.what does inertia mean?

neonofarm [45]

Answer:

a tendency to do nothing or to remain unchanged.

Explanation:

7 0

2 years ago

Given the reaction: 2H₂ + O₂ → 2H₂O The total number of grams of O₂ needed to produce 54 grams of water is _________.

Vedmedyk [2.9K]

Answer : The mass of $O_2$ needed are, 48 grams.

Explanation :

First we have to calculate the moles of $H_2O$

$\text{Moles of }H_2O=\frac{\text{Given mass }H_2O}{\text{Molar mass }H_2O}=\frac{54g}{18g/mol}=3mol$

Now we have to calculate the moles of $O_2$

The given balanced chemical reaction is:

$2H_2+O_2\rightarrow 2H_2O$

From the reaction, we conclude that

As, 2 mole of $H_2O$ produces from 1 mole of $O_2$

So, 3 mole of $H_2O$ produces from $\frac{3}{2}=1.5$ mole of $O_2$

Now we have to calculate the mass of $O_2$

$\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2$

Molar mass of $O_2$ = 32 g/mole

$\text{ Mass of }O_2=(1.5moles)\times (32g/mole)=48g$

Therefore, the mass of $O_2$ needed are, 48 grams.

4 0

3 years ago