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MakcuM [25]
3 years ago
14

Helium is the second most abundant element in the universe, but it is rare in Earth’s atmosphere. Most of the helium used to fil

l balloons and blimps must be extracted from Earth’s crust. How do you think this helium formed?
Chemistry
1 answer:
topjm [15]3 years ago
8 0

Explanation:

Helium is produced in radioactive process that occurs in deep and underground formations. They differ from other atmospheric gases. These radioactive decay of heavier nuclides that are unstable started about the time when the earth was formed.

  • As they decay they give off lighter particles that can easily be broken down into more stable ones.
  • One of the main product of the decay is alpha particles.
  • They have the same atomic structure as helium
  • These materials are trapped in underground formations.
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Match the following reactions with the reaction type. You may use each type more than once.
vaieri [72.5K]

Answer:

1) Decomposition

2)Double-replacement reaction

3)synthesis

4)Double-replacement reaction

5)single-replacement reaction

6)Double-replacement reaction

Explanation:

Step 1: Data given

Synthesis: This is a reaction where two or more reactants will combine to form a new, single product. This is  occurs when two or more reactants combine to form a single product.  This can be shown with the following equation.

A + B → C

A and B are the reactants to form a new product C

Decomposition: This is a reaction where 1 (more complex) compound will be broken down into 2 or more (more simple)  products.

This can be shown by the following equation:

AB → A + B

A single replacement: This is a reaction where one element wil be replaced by another element in the same compound. This can be shown by the following equation:

A + BC → B + AC

Here is the elemnt B in the compound BC, replaced by the element A, to form a new compound AC

A double-replacement: This is a reaction where the positive and negative ions of two ionic compounds will be exchanged and 2 new compounds willbe formed. This can be shown by the following equation:

AB+CD→AD+BC

A combustion reaction requires oxygen gas (O2) to produce the  products CO2 and H2O

Step 2:

1) 2HgO(s) → 2Hg(l) + O2(g)

⇒ Decomposition

2) KCl(aq) + AgNO3(aq) → AgCl(s) + KNO3(aq)

⇒  Double-replacement reaction

3) 2Na(s) + H2(g) → 2NaH(s)

⇒ synthesis

4) Mg(OH)2(aq) + 2HNO2(aq) → Mg(NO2)2(aq) + 2 H2O(l)

⇒  Double-replacement reaction

5) Ca(s) + 2AgNO3(aq) → Ca(NO3)2(aq) + Ag(s)

⇒  Single-replacement reaction

6) Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)

⇒  Double-replacement reaction

8 0
3 years ago
Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star
NeTakaya

I believe the correct answer would be "neutron star"

5 0
3 years ago
Read 2 more answers
Pls help me this is my last question
asambeis [7]

Answer: how much mass is in a certain amount of space

Explanation: density is g/mL; therefore it’s the mass (g) in a certain amount of space (mL)

7 0
3 years ago
Read 2 more answers
How many atoms are in 1.0 formula units of magnesium acetate?
Ray Of Light [21]

Answer:

15

Explanation:

Magnesium Acetate Mg(C2H3O2)2

Number of atoms:

Carbon = 4

Hydrogen = 6

Magnesium = 1

Oxygen = 4

Total = 15

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3 years ago
How many moles of oxygen are in 1 mole of Pb(SO4)2
irakobra [83]
The answer to the question is Eight
4 0
3 years ago
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