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dexar [7]
3 years ago
6

Where do all of the elements heavier than Hydrogen come from?

Chemistry
1 answer:
Mamont248 [21]3 years ago
7 0
B.They were forged inside of stars.
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Practice Problems Exercise 8.6 Classify each of the following reactions in as many ways as possible.4N H3 (g) 5 O2 (g) n 4NO(g)
nikklg [1K]

Explanation :

(a) 4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)

This reaction is combustion reaction in which an oxygen react with a molecule to give its corresponding oxides ans water molecule.

(b) S_8(s)+8O_2(g)\rightarrow 8SO_2(g)

This reaction is a redox reaction or oxidation-reduction reaction in which sulfur get oxidized and oxygen get reduced.

(c) 2Al(s)+3Cl_2(g)\rightarrow 2AlCl_3(s)

This reaction is a combination reaction in which the two reactants molecule combine to form a large molecule or product.

(d) 2AlN\rightarrow 2Al(s)+N_2(g)

This reaction is a decomposition reaction in which a large molecule or reactant decomposes to give two or more molecule or products.

(e) BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaCl(aq)

This reaction is a double displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.

(f) 2Cs(s)+Br_2(l)\rightarrow 2CsBr(s)

This reaction is a combination reaction in which the two reactants combine to form a large molecule or product.

(g) KOH(aq)+HCl(aq)\rightarrow H_2O(l)+KCl(aq)

This reaction is a double displacement reaction in which the cation of two reactants molecule exchange their places to give two different products.

(h) 2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2(g)+2H_2O(l)

This reaction is combustion reaction in which a hydrocarbon react with an oxygen to give carbon dioxide and water as a products.

6 0
3 years ago
4. What causes local winds to form?
Oxana [17]

Answer:

unequal heating and cooling of the landmass.

4 0
2 years ago
Read 2 more answers
Magnesium hydroxide [Mg(OH)2] is an ingredient in some antacids. How many grams of Mg(OH)2 are needed to neutralize the acid in
Allushta [10]

Answer:

1.95g of Mg(OH)2 are needed

Explanation:

Mg(OH)2 reacts with HCl as follows:

Mg(OH)2 + 2 HCl → MgCl2 + 2H2O

<em>Where 1 mole of Mg(OH)2 reacts with 2 moles of HCl</em>

To solve this question we must find the moles of acid. Then, with the chemical equation we can find the moles of Mg(OH)2 and its mass:

<em>Moles HCl:</em>

158mL = 0.158L * (0.106mol / L) = 0.01675 moles HCl

<em>Moles Mg(OH)2:</em>

0.01675 moles HCl * (2mol Mg(OH)2 / 1mol HCl) = 0.3350 moles Mg(OH)2

<em>Mass Mg(OH)2 -Molar mass: 58.3197g/mol-</em>

0.3350 moles Mg(OH)2 * (58.3197g / mol) =

<h3>1.95g of Mg(OH)2 are needed</h3>
3 0
3 years ago
starting with methane ,name all the steps and write the equations involved in tetrachlorination.Remember all arrows sharing move
anygoal [31]

Answer:

See Explanation and image attached

Explanation:

Methane is an alkane. The commonest chemical reaction that alkanes undergo is substitution. During a substitution reaction, one or more atoms of hydrogen is/are replaced in the alkane.

In methane, in the presence of sunlight and molecular chlorine gas, a homolytic fission of Cl2 occurs to yield chlorine radicals in an initiation step.

The propagation steps involve reaction of the methane with chlorine radicals. Certain intermediates continue to be formed along the way until the tetrachlorination product is finally obtained.

4 0
3 years ago
If a sample of sodium chloride with a mass of
alex41 [277]
Original molarity was 1.7 moles of NaCl

Final molarity was 0.36 moles of NaCl

Given Information:

Original (concentrated) solution: 25 g NaCl in a 250 mL solution, solve for molarity

Final (diluted) solution: More water is added to make the new total volume 1.2 liters, solve for the new molarity

1. Solve for the molarity of the original (concentrated) solution.

Molarity (M) = moles of solute (mol) / liters of solution (L)

Convert the given information to the appropriate units before plugging in and solving for molarity.

Molarity (M) = 0.43 mol NaCl solute / 0.250 L solution = 1.7 M NaCl (original solution)

2. Solve for the molarity of the final (diluted) solution.

Remember that the amount of solute remains constant in a dilution problem; it is just the total volume of the solution that changes due to the addition of solvent.

Molarity (M) = 0.43 mol NaCl solute / 1.2 L solution

Molarity (M) of the final solution = 0.36 M NaCl

I hope this helped:))
6 0
3 years ago
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