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2 years ago

WILL GIVE BRAINLIEST

1 answer:

3 0

For the first one, you have to find one that has both a metal and a nonmetal in it, plus potassium. Bonds between nonmetals are called covalent because they share electrons and a bond between a metal and a nonmetal is an ionic bond because they exchange electrons.

Potassium chloride is KCl. Only an ionic bond.

Potassium hydride is KH. Only an ionic bond.

Potassium nitrate is KNO3. There we go, that has a covalent bond between the nitrogen and oxygen, and an ionic bond between potassium and the nitrogen and oxygen.

For the second one, potassium chloride is the answer because the other three also have covalent bonds. Chloride is the only one that isn't a compound.

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Convert 19 kcal into joules

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$19~ \text{kcal} = 19 \times 1000 ~\text{cal } = 19000~ \text{cal} = 19000 \times 4.184~ \text{J} = 79496~ \text{J}$

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2 years ago

In 1901, Thomas Edison invented the nickel-iron battery. The following reaction takes place in the battery.

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Answer:

Explanation:

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2 years ago

Which of the following are saturated hydrocarbons?

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2 years ago

How many variables should be tested at one time in a scientific investigation?

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One should be tested at once. You never want to test more because you will mix up your data

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3 years ago

Hãy tìm công thức hóa học của những oxit có thành phần khối lượng như sau S:50%; C:42,8%; Mn:49,6%; Pb:86,6%

Novosadov [1.4K]

Answer:

Find the chemical formulas of oxides that contain the following composition:

S:50%; C:42,8%; Mn:49,6%; Pb:86,6%

Explanation:

In the given oxide of sulphur,

50%S is present that means remaining 50% is O.

Divide the % with atomic mass:

S O

50/32= 1.5625 50/16=3.125

divide with smallest ratio:

1.5625/1.5625=1 3.125/1.5625=2

Hence, the formula of oxide is $SO_2$ .

Similarly:

Carbon is 42.8% means the reamining % will be O that is 57.2%.

C O

42.8/12=3.575 57.2/16=3.575

Divide with smallest ratio:

3.575/3.575=1 3.575/3.575=1

Hence, the formula of oxide is CO.

Mn is 49.6% means the remining is % is O that is 50.4%.

First divide with atmic mass of respective element, then get the smallest ratio.

That gives the mole ratio of each constituent atom.

Mn O

49.6/55.0=0.90 50.4/16=3.15

0.90/0.90=1 3.15/0.90=3.5

Multiply with two

2 7

Hence, the formula becomes:

$Mn_2O_7$

Pb is 86.6% means ---remaining 13.4% is O.

Pb O

86.6/207 = 0.418 mol 13.4/16=0.85

0.418/0.418=1 0.85/0.418=2.0

Hence, the formula is: $PbO_2$

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2 years ago