CHEMISTRY HIGH SCHOOL

Who is regarded as father of modern chemistry ?

Answers

Answer 1
Answer: Antoine Lavoisier is considered the father of modern chemistry. He was a French nobleman who recognized and named oxygen and isolated the major components of air.

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El hielo es una mezcla, elemento o compuesto?
a gas has a volume of 590 mL at a temperature of 590 mL at a temperature of -55.0 degrees Celsius. What volume will the gas occupy at 30.0 degrees Celsius?
10 Which statement correctly describes the location and charge of the electrons in an atom?F The electrons are inside the nucleus and have no charge.G The electrons are outside the nucleus and have no charge.H The electrons are inside the nucleus and have a negative charge.The electrons are outside the nucleus and have a negative charge.which is correct
Two fractions that are equivalent to 90/100
Which of the following is equal to 4 kilograms? A. 4,000 mgB. 4,000 gC. 40 gD. 4,000 cg

Which substance cannot be broken down by a chemical change?1) ammonia
2) ethanol
3) propanol
4) zirconium

Answers

Zirconium cannot be broken down by a chemical change, because it is an element. The others are all molecules. Hope ive helped :)

Answer:

Zirconium

Explanation:

This is because if you look it up in the periodic table you cannot break it apart by a chemical.

Which of these laboratory techniques is best to separate from a liquid to recover the liquid

Answers

It depends on what you are separating from the liquid. If it is a solid you can just filter it or put it in a centrifuge. If it is a dissolved solvent you might need to use something like chromatography. I am not very sure though. I hope this helps. Let me know if anything is unclear.

Find the normality of a solution containing 20g of H2SO4(sulfuric acid) per 500ml of solution. The molar mass of H2SO4 is 98 g/eq. H2SO4 has two replaceable H+.

Answers

H2SO4 ------------- > 2 H⁺  +  SO₄²⁻

g/eq =  molar mass / number of H⁺

g/eq = 98 / 2

= 49 g/eq

Volume in liters = 500 mL / 1000 => 0.5 L

N = 20 / 0.5 x 49

N = 20 / 24.5

= 0.816 N

hope this helps!

 

What is a problem commonly associated with nuclear power facilities?(1) A small quantity of energy is produced.
(2) Reaction products contribute to acid rain.
(3) It is impossible to control nuclear fission.
(4) It is difficult to dispose of wastes

Answers

The problem that is commonly associated with nuclear power facilities is "It is difficult to dispose of wastes" Option D. This is further explained below.

What are nuclear power facilities?

Generally, Nuclear power plants are simply defined as using the heat generated by nuclear fission to heat water. Atoms are torn apart in nuclear fission to generate smaller atoms.

In conclusion, nuclear power facilities have waste compounds that are hard to decompose.

Read more about Compound

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(1) False, lots of energy is actually produced from nuclear fuel, if we didn't get much then we probably wouldn't use it
(2) False, its burning coal that contributes to acid rain, since it contains sulfur
(3) False again, we can control the reaction with aptly named control rods, which are typically made of boron, to absorb some of the neutrons flying around in the chain reaction
(4) True, radioactive waste is very difficult to dispose of, and is also very dangerous. Sources of radiation can remain so for millions of years

Which of the following alcohols is dehydrated most easily with conc. H²SO⁴? a. p-O²NC⁶H⁴CH(OH)CH³ b. p-C1C⁶H⁴CH(OH)CH³ c. p-CH³OC⁶H⁴CH(OH)CH³ d. C³H⁵CH(OH)CH³

Answers

Answer:

a. p-o²nc⁶h⁴ch(oh)ch

Explanation:

Final answer:

The alcohol that is dehydrated most easily with conc. H₂SO₄ is p-C1C₆H₄CH(OH)CH₃.

Explanation:

The alcohol that is dehydrated most easily with conc. H²SO⁴ is p-C1C⁶H⁴CH(OH)CH³. This alcohol is tertiary, meaning it has three alkyl groups attached to the carbon atom containing the hydroxyl group. Tertiary alcohols are more easily dehydrated compared to primary and secondary alcohols because the carbon atom attached to the hydroxyl group is more stable due to the presence of the alkyl groups.

Learn more about dehydration of alcohols here:

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21 Which mathematical expression represents the heat of reaction for a chemical reaction?(1) (the heat of fusion) – (the heat of vaporization)(2) (the heat of vaporization) – (the heat of fusion)
(3) (the potential energy of the products) – (the potential energy of the reactants)
(4) (the potential energy of the reactants) – (the potential energy of the products)

Answers

Correct Answer: Option 3 i.e. (the potential energy of the products) – (the potential energy of the reactants)

Reason:
Heat of reaction for a chemical reaction is the  change in the enthalpy of a chemical reaction that occurs at a constant pressure. This can be measured on the basis of potential energy of reactants and products. Mathematically, it is expressed as:

            Heat of reaction = ΔH = ΣH products - ΣHr reactants.
The answer is (3) the potential energy of the products - the potential energy of the reactants. The reaction energy production can be represented by the change of energy of products and reactants.
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What is the empirical formula of a compound containing 24.56% potassium, 34.81% manganese, and 40.50% oxygen?
Which type of stoichiometric calculation does not require the use of the molar mass?