What are two examples of an endothermic reaction and what are two examples of an ectothermic reaction?

Answers

Answer 1

Answer: Exothermic processes: Making ice cubes,formation of snow in clouds

Endothermic processe: Melting ice cubes, evaporation of water

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Which gaseous element has the greatest density at stp n2 o2 cl2 f2?

Answers

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, Cl $_2$ is the only gaseous element has the greatest density at STP.

What is density?

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the element ÷volume marked on the graduated cylinder

From formula we can see that density is directly proportional to molar mass of the given element. the increasing order of molar mass is N $_2$ < O $_2$ <F $_2$ <Cl $_2$ . The increasing order of density would be N $_2$ < O $_2$ <F $_2$ <Cl $_2$ .

Therefore, Cl $_2$ is the only gaseous element has the greatest density at STP.

To know more about density, here:

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1 mole Cl2 will have a density of 71/22.4 gram per liter

In general 1 mole of any gas will have a density of (mol.mass)/22.4 gram per liter at STP

What was concluded about the structure of the atom as the result of the gold foil experiment?(1) A positively charged nucleus is surrounded by positively charged particles.
(2) A positively charged nucleus is surrounded by mostly empty space.
(3) A negatively charged nucleus is surrounded by positively charged particles.
(4) A negatively charged nucleus is surrounded by mostly empty space.

Answers

Answer is: 2) A positively charged nucleus is surrounded by mostly empty space.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

The conclusion about the structure of the atom as the result of the gold foil experiment is that a positively charged nucleus is surrounded by mostly empty space. The answer is number 2. Also, he concluded that an atom was not an empty space but rather, the electrons are scattered.

How do you calculate the number of moles when given the number of particles?

Answers

Answer:

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the mass of empty cylinder is 20 gram its mass when its filled completely with water is 30 gram and its mass when its filled completely with unknown liquid is 27 gram find the density of, the unknown liquid

Answers

Answer:

≈ 0.70 g/cm³ (answer rounded up to 2 decimal places)

Explanation:

The mass of empty cylinder is 20g

The mass of water filling the cylinder = 30g - 20g = 10g

The mass of unknown liquid filling the cylinder = 27g - 20g = 7g

Density of water = 997 kg/m³

Converting this density to g/cm³ we get;

1kg = 1000g , 1m³ = 1000000cm³

So density = $(997000)/(1000000)$ g/cm³ = 0.997 g/cm³

So the volume of water occupied by 10g is;

10 × 0.997 = 9.97 cm³

This volume is also occupied by 7g of the unknown liquid.

Density = mass/volume

Density of the unknown liquid = 7g ÷ 9.97cm³ = 0.702106319 g/cm³ ≈ 0.70 g/cm³ (answer rounded up to 2 decimal places)

Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.
An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.

State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.
Identify the functional group in a molecule of ethanol in the alternative fuel E-85.

Answers

Because of the 92% isooctane, the gasoline sample's octane rating is 92.The functional group in ethanol is the hydroxyl group.

Consider three gases: Ar, SF6, and Cl2. If 50.0 grams of these gases are placed in each of three identical containers, which container will have the highest pressure? The volume and temperature of all three containers are the same.

Answers

The ideal gas law:
$pV=nRT \Rightarrow p=(nRT)/(V)$
p - pressure, n - number of moles, R - the gas constant, T - temperature, V - volume

The volume and temperature of all three containers are the same, so the pressure depends on the number of moles. The greater the number of moles, the higher the pressure.
The mass of gases is 50 g.

$Ar \nM \approx 39.948 \ (g)/(mol) \nn=(50 \ g)/(39.948 \ (g)/(mol)) \approx 1.25 \ mol \n \nSF_6 \nM \approx 146.06 \ (g)/(mol) \nn=(50 \ g)/(146.06 \ (g)/(mol)) \approx 0.34 \ mol \n \nCl_2 \nM=70.9 \ (g)/(mol) \nn=(50 \ g)/(70.9 \ (g)/(mol)) \approx 0.71 \ mol$

The greatest number of moles is in the container with Ar, so there is the highest pressure.

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