CHEMISTRY HIGH SCHOOL

2
How many molecules are in 2.47 moles of CC14? *

Answers

Answer 1
Answer: Answer:

1.49x10^24 molecules

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Which of the following has the most electrons?A) Sr^{2+}
B) Rb
C) Cl^{-}
D) Kr

Answers

Sr^(2+) = 36
Rb = 37
Cl^(-) = 18
Kr = 36

So the one with the most is (B) Rb

The oxidation number of U in UO2 is Option 1: +2 Option 2: +4 Option 3: +6 Option 4: -2

Answers

Answer: +4

Explanation:

Firstly, we know that Oxygen should have an oxidation number of -2. This is because according to oxidation rules, Oxygen's number will always be -2 unless it is a part of a peroxide and then it will be -1 (ex: H2O2).  UO2 is not a peroxide, so the regular rules will apply.

We also know that oxidation numbers in a molecule with no charge should add up to zero. There are two oxygen molecules which makes their total oxidation numbers equal to -4. Therefore, whatever U's oxidation number is should cancel out that -4 to make the total number 0.

So, U's oxidation number should be +4 since -4+4=0.

Claculate the molar mass of sodium sulphate na2so4

Answers

Na₂SO₄ = 23 * 2 + 32 + 16 * 4 = 142.0 g/mol

hope this helps!

which of the following is not a mixture? a)antibiotic b)evaporated milk c)brewed coffee d)hydrogen chloride

Answers

Answer:

d) Hydrogen chloride

Explanation:

Hydrogen chloride (HCl) is not a mixture. It is a chemical compound composed of two elements, hydrogen (H) and chlorine (Cl), combined in a fixed ratio. In contrast, the other options (antibiotic, evaporated milk, brewed coffee) all involve mixtures:

Antibiotics are typically mixtures of various chemical compounds used for medicinal purposes.

Evaporated milk is a mixture of milk and water with the water removed.

Brewed coffee is a mixture of water and coffee grounds, often with other components like sugar or cream added.

Hydrogen chloride, on the other hand, is a pure compound with a defined chemical formula (HCl) and consistent composition.

How many hydrogen(H) atoms are on the reactants side

A.2
B.6
C.12
D.6

Answers

I’m pretty sure it’s c

The normal boiling point corresponds to the temperature at which both the liquid and gas are under the standard atmospheric pressure of 1 atm.TRUE

FALSE

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TRUE. (Lorenzo Romano Amadeo Carlo Avogadro) Ideal Gas Law that defined as one in which all collisions between atoms or molecules are perfectly elastic in which there are no intermolecular attractive forces.  In such a gas, all the internal energy is the form of kinetic energy and any change in internal energy is accompanied by a change in temperature. That characterized by three state variables: absolute pressure (P) = 1 atm, volume (V) = 22.4 L and absolute temperature (T) = 273 K.
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