3 years ago

Which of these elements has the smallest atomic radius?

Chemistry

1 answer:

Elodia [21]3 years ago

5 0

Krypton. The atomic radius decreases as you go across a period.

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Mg(OH)2 is a compound. How many different elements are found in this compound?

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Answer:

Explanation:

3 different elements are found

Mg - magnesium

O -oxygen

H - hydrogen

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3 years ago

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Which of the following is an example of a covalent bond?

loris [4]

Answer:

C. H2O

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3 years ago

A sample of nitrogen gas has a volume of 450 cm3 and a pressure of 125 kPa. What volume would the gas occupy at 90 kPa if the te

slega [8]

Answer:

V2= 625 cm^3

Explanation:

P1 × V1 = P2 × V2

P1 (initial pressure)=125 kPa

V1 ( initial volume)= 450 cm^3

P2 (final pressure)=90kPa

V2 (final volume)= ?

Rearrange the equation to make V2 the subject, since it is the value we are trying to find

V2=(P1 × V1)/P2

V2= (125 ×450)/90

V2= 625 cm^3

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4 years ago

Write the reaction of ammonia and water. Label the acid, base, conjugate acid and conjugate base.

rewona [7]

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

The equilibrium reaction will be,

$NH_3+H_2O\rightleftharpoons NH_4^++OH^-$

In this reaction, $NH_3$ and $H_2O$ are base and acid and $NH_4^+$ and $OH^-$ are conjugate acid and conjugate base respectively.

Ammonia is a weak base because it accept proton from the water and gives fewer hydroxide ions.

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4 years ago