CHEMISTRY HIGH SCHOOL

Which combination best represent the mass and charge of a neutron? 0 amu; positive
1 amu; neutral
1 amu; positive
0 amu; neutral

Answers

Answer 1
Answer: The correct answer is 1 amu; neutral

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HIGH SCHOOL

4.What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment? A.The stream of cathode ray particles was moving very slowly.
B.The glass opposite of the negative electrode started to glow.
C.The electric voltage had little effect on the stream of particles.
D.The tube contained two pieces of metal that served as electrodes.

11.The table below gives the data that is needed to calculate the average atomic mass of element B.

B-10(Isotope), 10.01(Atomic mass), 19.91(Relative abundance %)
B-11(Isotope), 11.01(Atomic mass), 80.09(Relative abundance %)

Answers

Answer 4:

Correct option is B

B.The glass opposite of the negative electrode started to glow.

Explanation:

In his experiment, tubes were two electric plates, producing a positive anode and a negative cathode, which he expected that it would deflect the rays. As he supposed, the rays were deflected by the electric charge, proving beyond doubt that the rays were made up of charged particles bearing a negative charge.

Answer 11:

Boron is a chemical element in the periodic table with symbol B and has atomic number 5.

Boron has two naturally occurring isotopes Boron-10 and Boron-11. The average atomic mass of these are calculated as

(10.01×0.198) + (11.01×0.802) =  10.81 amu

So, the average atomic mass of the Boron isotopes is 10.81 amu.

Answer:

The answer is b

Explanation:

I just recently did the test

HIGH SCHOOL

Suppose that 0.52 g of water at 25 ∘C condenses on the surface of a 51-g block of aluminum that is initially at 25 ∘C. If the heat released during condensation goes only toward heating the metal, what is the final temperature (in ∘C) of the metal block

Answers

According to the Law of Conservation of Energy, energy can neither be created nor destroyed. It is just transferred from one system to each other in different forms. In this case, the heat released by the water through condensation, is used to heat the metal block. 

Heat of water = Heat of aluminum

To determine the heat released during a phase change, we focus on the latent heat. The latent heat of condensation is equal to -2,260 J/g. Hence,

Heat of water = (0.52 g)(-2,260 J/g) = -1,175.2 J

The heat of aluminum is sensible heat. It is equal to the mass times specific heat of the aluminum times the temperature change: H = mCpΔT. The specific heat of aluminum is 0.921 J/g-°C.

Heat of aluminum = (51 g)(0.921 J/g-°C)(T - 25°C) = -1,175.2 J

Solving for T,
T = 50°C

Therefore, the final temperature is 50°C.
MIDDLE SCHOOL

Which of the following statements is true? Kinetic energy depends on mass, gravity, and speed.
All machines lose some energy because of friction.
Heat lost during work is easily recovered and used for useful actions.
Temperature and heat are the same.

Answers

Answer:

123wewewedeweweewewewe

Explanation:

HIGH SCHOOL

In which of the following is the solution concentration expressed in percent by volume 10 mL of solute
_________ x 100%
100 ml of solvent


10 g of solute
_________ x 100%
100 ml of solvent



10 mL of solute
_________ x 100%
100 ml of solution



10 g of solute
_________ x 100%
100 ml of solution

Answers

Answer : The correct option is,

Explanation :

The solution concentration expressed in percent by volume means that the amount of solute present in 100 parts volume of solution.

It is represented in formula as :

Or,

Hence, the correct option is,

10ml of solute/100ml of solution *100% third one
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