CHEMISTRY HIGH SCHOOL

What is the boiling point (in °C) of a 0.195 maqueous solution of K2S?
Enter your rounded answer with
3 decimal places.
Kb for water = 0.512 °C/m


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What is the boiling point (in °C) of a 0.195 - 1

Answers

Answer 1
Answer:

Answer:100.3

Explanation:

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The closeness of a measurement to the actual value of what is being measured

Answers

Hey!

This is known accuracy. Think of accuracy as like shooting at the bulls eye on a target.

However think of precision like if all your darts fell on the lower left side of the target. Precision is just how close together the measurements are with each other.

Q4. Oil rigs are used to drill for crude oil.a. Drill heads are made from steel. Steel is an alloy.
Explain why Alloys are harder than pure metals.

b. Drill heads also contain diamonds.
Describe as fully as you can the structure and bonding in diamond.

c. Polymers are produced from crude oil.
Describe the structure and bonding in thermosoftening polymer and explain why thermosoftening polymers melt when heated.

Answers

a. Alloys are made up of 2 or more melted down metals to make 1 stronger metal
b. Drills use non pure diamonds that had carbon spots and because of this diamond (hardest mineral) is used on some drill heads to last longer
c. Everything in the world has a melting point of some degree some elements take 300° to melt while some can melt just from being in your hand 

What happens in a chain reaction

Answers

Answer: Neutrons released act as reactants in next reaction.

Explanation:

Nuclear chain reactions occur in fission reactions only. Nuclear fission reactions are defined as the reactions in which larger nuclide splits into two or more smaller daughter nuclides.

In nuclear chain reaction, the neutrons that are released in the previous fission reaction act as the starting material in the next reaction. Thus, this process continues to many reactions and hence, is known as nuclear chain reaction.

For Example: Uranium-235 on bombardment of 1 neutron undergoes fission reaction producing 3 neutrons and a huge amount of energy. The reaction follows:

_(92)^(235)\textrm{U}+_0^1n\rightarrow 3_0^1n+_(36)^(92)\textrm{Kr}+_(56)^(141)\textrm{Ba}+\text{energy}

Hence, neutrons released act as reactants in next reaction.
Hi there! A nuclear fission is a chain reaction. What happens in a food chain is that a uranium-235, which is a atom absorbs a neutron, and then it fissions into two new atoms. Which then releases three new neutrons and a lot of binding energy.

When [OH-] changes from 10-9 to 10-11 in a solution: Kw = [H+][OH-]

What is the [H+] after the change?

Answers

According to the fact that  [H+]*[OH-] is always equal Kw= 1x10^(-14), you can easily find concentration of [H+] by changing from 1*10^(-9)to 1*10^(-11)
H increases, Kw is constant, therefore 10^-14 / 10^-11 = 10^-3.
And you will have Hence [H+] = 10^-3 where pH is 3

Answer:

2

Explanation:

Explain the connection between Earth's magnetic field and iron.

Answers

The Earth's magnetic field is somewhat caused by the composition of the earth's core which is rich in iron minerals. There is a solid inner core that is made of iron which makes up to 2/3 of the moon's size. The charged metal of the iron produces electric currents, consequently resulting to Earth's magnetic field.

Answer:

The Earth's magnetic field is caused by how the earth's core is made. The earth's core is full of iron, especially in the inner core. That inner core is charged metal that produces electric currents that causes Earth's magnetic field. So because the core has iron, we have a magnetic field.

Which compound has the highest percent com­position by mass of strontium?(1) SrC12 (2) SrI2 (3) SrO (4) SrS

Answers

The answer is (3). The number of Sr is the same so if the compound has the smallest gram formula mass, it has the highest percent composition by mass of strontium. So the answer is (3).

Answer: option (3) SrO, with 84.56%

Explanation:

You have to calculate the mass of strontium and the mass of the compound, for each of the four compounds, and compute the percent:

percent of strontium = (mass of strontium / mass of the chemical formula) × 100 %.

These are the atomic masses of the elements that you have to use:

Atomic mass of Sr: 87.62 g/mol

Atomic mass of Cl: 35.453 g/mol

Atomic mass of I: 126.904 g/mol

Atomic mass of O: 15.999 g/mol

Atomic mass of S: 32.065 g/mol

(1) SrCl₂:

i) mass of Sr: 87.62 g/mol

ii) mass of Cl₂: 2×35.453 g/mol = 70.906 g/mol

iii) mass of SrCl₂: 87.62 g/mol + 70.906 g/mol = 158.526 g/mol

iv) Sr % = [87.62 / 158.526 ] × 100 = 55.27%

(2) SrI₂

Following the same procedure:

i) Sr % = [87.62 / (87.62 + 2× 126.904) ] × 100 = 25.66%

(3) SrO

i) Sr % = [87.62 / (87.62 + 15.999) ] × 100 = 84.56%

(4) SrS

i) Sr % = [87.62 / (87.62 + 32.065) ] × 100 = 73.21%
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