All categories

3 years ago

What do covalent bonds usually form at room temperature?.

Chemistry

1 answer:

hichkok12 [17]3 years ago

7 0

Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation.

You might be interested in

Which one of the following is a balanced equation?

sattari [20]

I think the answer is b

5 0

3 years ago

What mass of hydrogen is produced from 5.71 mol of aluminum?

nasty-shy [4]

Answer:

3.03 g

Explanation:

The first thing to do here is figure out the chemical formula for aluminium hydroxide.

Aluminium is located in group

of the periodic table, and forms

cations,

. The hydroxide anion,

−

, carries a

−

charge, which means that a formula unit of aluminium hydroxide will look like this

[

]

[

−

]

→

(

)

Now, you can figure out the mass of hydrogen present in

mole of aluminium hydroxide by first determining how many moles if hydrogen you get in

mole of aluminium hydroxide.

Since

mole of aluminium hydroxide contains

moles of hydroxide anions, which in turn contain

mole of hydrogen each, you can say that you will have

1 mole Al

(

)

→

moles OH

−

→

moles H

The problem tells you that the molar mass of hydrogen is equal to

1.01 g mol

−

. This means that

mole of hydrogen has a mass of

1.01 g

You can thus say that one mole of aluminium hydroxide contains

moles H

⋅

1.01 g

mole H

3.03 g H

∣

I'll leave the answer rounded to three sig figs. Btw my sister calculated this oof

5 0

3 years ago

How are molecules, compounds, and pure substances related?

White raven [17]

Answer:

Explanation:

The reason they are all related is because the ionic bond between them is very strong.

8 0

2 years ago

Read 2 more answers

What are the mole fraction and the mass percent of a solution made by dissolving 0.21 g KBr in 0.355 L water? (d = 1.00 g/mL.) m

IRISSAK [1]

Answer:

Mol fraction H2O = 0.99991

Mol fraction KBr = 0.00009

mass % KBr = 0.059 %

mass % H2O = 99.941 %

Explanation:

Step 1: Data given

Mass of KBr = 0.21 grams

Molar mass KBr = 119 g/mol

Volume of water = 355 mL

Density of water = 1.00 g/mL

Molar mass water = 18.02 g/mol

Step 2: Calculate mass water

Mass water = 355 mL * 1g /mL

Mass water = 355 grams

Step 3: Calculate moles water

Moles water = mass water / molar mass water

Moles water = 355 grams / 18.02 g/mol

Moles water = 19.7 moles

Step 4: Calculate moles KBr

Moles KBr = 0.21 grams / 119 g/mol

Moles KBr = 0.00176 moles

Step 5: Calculate total moles

Total moles = 19.7 moles + 0.00176 moles

Total moles = 19.70176 moles

Step 6: Calculate mol fraction

Mol fraction H2O = 19.7 moles / 19.70176 moles

Mol fraction H2O = 0.99991

Step 7: Calculate mol fraction KBr

Mol fraction KBr = 0.00176 / 19.70176

Mol fraction KBr = 0.00009

Step 6: Calculate mass %

mass % KBR = (0.21 grams / (0.21 + 355) grams) *100%

mass % KBr = 0.059 %

mass % H2O = (355 grams / 355.21 grams) *100%

mass % H2O = 99.941 %

8 0

3 years ago

A nitrogen atom has five valence electrons. The Lewis structure shows how a nitrogen atom bonds with three hydrogen atoms to for

nordsb [41]

It has too be 6 or 4

3 0

3 years ago