CHEMISTRY HIGH SCHOOL

If 2a=3b and a=6 then b=

Answers

Answer 1
Answer:

then b is 4

2a=3b since a=6

2x6=3b

12=3b

b=12/3

b=4
Answer 2
Answer:

Answer:

b=4

Explanation:

2a=3b

2a=2*6

2*6=12

2a=12

12=3b

12/3=4

b=4

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Activation energy is only required to start an exothermic reaction. True or False?

Answers

Answer:

False

Explanation:

Activation energy is the minimum amount of energy required for a reaction to proceed. Hence, for a reaction (endothermic and exothermic) to occur/proceed, the activation energy must be met. This is because, a reaction is only endothermic or exothermic when the reaction has started/occurred. If the activation energy is not produced, there will be no reaction in the first place.

NOTE: Exothermic reaction is a reaction that involves the release of energy (heat or light) into the surroundings. While endothermic reaction is a reaction that requires the input of energy or it absorbs energy from the environment.

false it is only not required when you have a catalyst

Why did Rutherford conclude that the atom was mostly empty space?

Answers

Rutherford came to this conclusion after his Gold-Foil experiment. He found that most of the alpha particales(when released) went straight through the gold foil, of which consisted of atoms. In the middle of the atom theres a small nucleus that has mass and positive charge. Because the nucleus is so small the alpha particles were able to go straight through leading to the conclusion that atoms are mostly empty space. 

a sample of aluminum is placed in a 25.0 ml graduated cylinder containing 10.0 ml of water the level of the water rises to 18.0 ml aluminum has a density of 2.70 g/mL what is the mass?

Answers

2.70 g/cm^2 * 8 cm^2 = 21.6 g or 0.0216 kg.

A rigid tank contains 1.40 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 24.5 atm to 5.30 atm. Assume the volume of the tank and the temperature of the gas remain constant during this operation.

Answers

Answer : The final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.

Explanation :

As we know that:

PV=nRT

At constant volume and temperature of gas, the pressure will be directly proportional to the number of moles of gas.

The relation between  pressure and number of moles of gas will be:

(P_1)/(P_2)=(n_1)/(n_2)

where,

P_1 = initial pressure of gas = 24.5 atm

P_2 = final pressure of gas = 5.30 atm

n_1 = initial number of moles of gas = 1.40 moles

n_2 = final number of moles of gas = ?

Now put all the given values in the above expression, we get:

(24.5atm)/(5.30atm)=(1.40mol)/(n_2)

n_2=0.301mol

Therefore, the final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.

Which of these features was formed by hotspot volcanism?The Grand Canyon
The Big Island of Hawaii
The Appalachian Mountains
The Himalaya Mountain Range

Answers

These feature that was formed by hotspot volcanism is The Big Island of Hawaii. The Hawaiian Islands are actually found at the tip of several volcanoes that has been formed by a series of volcanic eruptions. Today, the Big Island sits on the hotspot, and contains the only active volcanoes of the group of islands.
The Big Island of Hawaii was formed by hotspot volcanism, whereas The Grand Canyon, The Appalachian Mountains, and The Himalaya Mountain Range were not.

What are the three factors that speed up solvation also called mixing and dissolving?

Answers

1. Temperature
2. Agitation ( Stirring )
3. Increasing the Surface area

however, 1 and 2 act opposite in gases while 3 doesn't affect gases.

The only thing that affect gases is
4. pressure
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