What is the oxidation number of iodine in KIO4?(1) +1 (3) +7(2) -1 (4) - 7

Answers

Answer 1

Answer: K ( potassium ) = + 1

I ( iodine ) = + 7

O ( oxygen ) = - 2

hope this helps!

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Gas occupies 30 Liters at 2.0 atm pressure and 27° Celsius. How many moles of gas are present

Answers

Your answer to this question is 2.44 mol.

What is the chemical equation for nicotine?

Answers

The chemical formula for nicotine is C10H14N2, with a molecular mass of 162.23 . In proper nomenclature, nicotine is 3-(1-Methyl-2-pyrrolidinyl)pyridine.

Which is a basic funcional group that can accept H+ and become positively charged? A) CH ₃ B) OH C) NH₂ D) COOH

Answers

C) NH2

EXPLANATION:
the amino group (NH2) is a basic, or alkaline, group which can accept a proton (H+) and become positively charged.

According to Hess’s law, if a series of intermediate reactions are combined, the enthalpy change of the overall reaction isthe difference between the enthalpies of the intermediate reactions.
the sum of the enthalpy changes of the intermediate reactions.
the product of the enthalpy changes of the intermediate reactions.
the fraction of the individual enthalpies of the intermediate reactions.

Answers

Answer : The correct option is, the sum of the enthalpy changes of the intermediate reactions.

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

For example :

The formation reaction of CO will be,

$C(graphite)+(1)/(2)O_2(g)\rightarrow CO(g)$ $\Delta H_(formation)$

The intermediate balanced chemical reaction will be,

(1) $C(graphite)+(1)/(2)O_2(g)\rightarrow CO_2(g)$ $\Delta H_1$

(2) $CO+(1)/(2)O_2(g)\rightarrow CO_2(g)$ $\Delta H_2$

The expression for enthalpy of formation of CO is,

$\Delta H_(formation)=[n* \Delta H_1]+[n* \Delta H_2]$

where,

n = number of moles

By adding reaction 1 and reverse reaction of reaction 2, we get the enthalpy of formation of CO.

Hence, the correct option is, the sum of the enthalpy changes of the intermediate reactions.

I think the answer is B. the sum of the enthalpy changes of the intermidiate reactions

Each glucose molecule consists only of carbon, hydrogen, and oxygen atoms. If each molecule contains 53.3% oxygen and 6.7% hydrogen by mass, what percentage of each glucose molecule is made up of carbon?

Answers

53.3% + 6.7% = 60%, 100% - 60% = 40%. 40% of glucose is made of carbon. Since there are only three types of atoms in glucose, and the amount of hydrogen and oxygen is already given, this means that whatever percentage is left (40%) has to be carbon.

What are some uses of metals?

Answers

They are used to make plane bodies.
Some are used for electrical wires eg copper because they are good conductors of electricity.
Used in building materials.
used to make jewelry eg gold and silver

Copper and aluminium wire are used to carry electric current.Copper, aluminium and iron are used to make domestic utensils and factory equipment.Thin foils of aluminium are used for wrapping cigarettes, medicines, confectionery, etc.Aluminium is used for making angles, doors, pipes, etc. which are used in the construction of houses.Metals such as sodium, titanium, zirconium, etc. are used in generation of nuclear energy and in space science projects.Mercury is used in thermometers.Magnesium metal is used as a strong reducing agent to prepare other metals.Gold and silver metals are used to make jewellery.Thin foils of silver and gold are used to decorate sweets.Uranium metal is used to generate nuclear energy.Titanium metal is very hard, resistant to corrosion, light, has high melting point and is good conductor of heat and electricity. Because of its unique and useful properties titanium is sometimes called ‘the wonder metal’.

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