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3 years ago

Please help I will mark Brainly!!!

Chemistry

1 answer:

ICE Princess25 [194]3 years ago

3 0

Group 6A elements have 2 valence electrons in an s orbital and 4 valence electrons in p orbitals. so in total 6 valence electrons.

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Calcium reacts with hydrochloric acid,HCI, to make calcium chloride and hydrogen gas (H2).

aleksandr82 [10.1K]

Answer:

1.)calcium+hydrochloric acid -->calcium chloride +hydrogen

2.)Ca + 2HCl -->CaCl2 + H2

3.)3.55g

Explanation:

1.) pretty self explanatory

2.)Ca + HCl -->CaCl2 + H2

then balance

Ca + 2HCl -->CaCl2 + H2 (+2 infront of Hcl)

3.) take calcium and calcium chloride

Ca + CaCl2

then you need the relative atomic mass of both

Ca=40

CaCl2=71 (40+(35.5x2))

Ca=40 40/40=1 1x2=2g

Then repeat that exact equation for calcium chloride

CaCl2=71 71/40=1.775 1.775x3=3.55g

3 0

3 years ago

3. If 175 grams of nitrogen reacted with hydrogen to make hydrogen, how much ammonia would be needed?

zmey [24]

Answer:

37.5 g of H₂

Explanation:

N₂ (28g) + 3H₂ (6g) => 2NH₃ (34g)

Every 28g of N₂ needs 6g of H₂

=> Every 7g of N₂ needs 1.5g of H₂

=> 175g of N₂ needs 1.5 x 25 g of H₂

=> 37.5 g of H₂

7 0

2 years ago

A person loses 2.70 lb in two weeks. how many grams did they lose?

leonid [27]

Answer:

1224.7

Explanation:

Each lb is 453.59

6 0

3 years ago

A fossil which has been preserved by it's replacement by minerals is called _______

german

It's possible the answer is petrified fossil

7 0

3 years ago

Read 2 more answers

What type of chemical bond would form between an atom of lithium (Li) and an atom of chlorine (Cl). Explain specifically why thi

Aleksandr-060686 [28]

Explanation:

When a bond is formed by transfer of electrons from one atom to another then it results in the formation of an ionic bond.

An ionic bond is generally formed by a metal and a non-metal.

For example, lithium is an alkali metal with atomic number 3 and its electronic distribution is 2, 1.

And, chlorine is a non-metal with atomic number 17 and its electronic distribution is 2, 8, 7.

So, in order to complete their octet lithium needs to lose an electron and chlorine needs to gain an electron.

Hence, both of then on chemically combining together results in the formation of an ionic compound that is, lithium chloride (LiCl).

An ionic compound is formed by LiCl because lithium has donated its valence electron to the chlorine atom.

On the other hand, if a bond is formed by sharing of electrons between the two chemically combining atoms then it is known as a covalent bond.

For example, $O_{2}$ is a covalent compound as electrons are being shared by each oxygen atom.

7 0

3 years ago