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3 years ago

Which of the following isotopes is needed to complete this nuclear equation?

Chemistry

2 answers:

Snezhnost [94]3 years ago

7 0

Answer:

$^{55} _{26}Fe$

Explanation:

Let's consider the following nuclear equation.

$^{55} _{25}Mn + ^{2} _{1}H \rightarrow \_\_\_ + 2^{1} _{0}n$

According to the law of conservation of matter, all the matter that is on the reactants must be in the products.

Mn has 25 protons and H has 1 proton. Therefore, in the products there must be 26 protons. The neutrons do not have protons, so the 26 protons belong to the unknown element. (The only option with 26 protons is c) Fe).

Mn has 55 -25 = 30 neutrons. H has 2 - 1 = 1 neutron. The total number of neutrons is 31. There are 2 neutrons to the right so Fe must have the remaining 29.

The mass number of Fe is 26 p⁺ + 29 n⁰ = 55. This confirms that the missing element is $^{55} _{26}Fe$ .

UkoKoshka [18]3 years ago

6 0

The correct answer is C.

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Aluminum oxide (Al2O3) occurs in nature as a mineral called corundum, which is noted for its hardness and resis- tance to attack

Neko [114]

Answer:

7.03×10²³ atoms of Al

Explanation:

Corundum density = 3.97g/cm³

Corundum = Al₂O₃. Then, you have 2 moles of Al and 3 moles of O in 1 mol of the compound.

Let's determine the mass of corundum, by density

Corundum density = Corundum mass / Corundum volume

3.97 g/cm³ = Corundum mass / 15cm³

3.97 g/cm³ . 15cm³ = Corundum mass →59.55 g

Now, let's find out how many moles are in that mass of corundum

1 mol of Al₂O₃ weighs 101.96 g/mol

Then, 101.96 grams of oxide have 2 moles of Al

59.55 g of oxide, will have (59.55 .2)/101.96 = 1.17 moles

Now, we can know the quantity of atoms, by this rule of three

1 mol has NA atoms (6.02×10²³)

1.17 moles will have (1.17 . NA) = 7.03×10²³ atoms of Al

5 0

3 years ago

Which of the following is a nonrenewable resource?

dybincka [34]

C. Natural gas

Hope this helps!

8 0

3 years ago

Read 2 more answers

If I use the dropper to add 10 mL of drink mix to 50 mL of water, what is the

Yuliya22 [10]

Answer:

16.7%

Explanation:

From the question given above, the following data were obtained:

Volume of drink mix = 10 mL

Volume of water = 50 mL

Percentage of drink mix =?

Next, we shall determine the total volume of the solution. This can be obtained as follow:

Volume of drink mix = 10 mL

Volume of water = 50 mL

Total volume of solution =?

Total volume of solution = (Volume of drink mix) + (Volume of water)

Total volume of solution = 10 + 50

Total volume of solution = 60 mL

Finally, we shall determine the percentage of the drink mix in the solution. This can be obtained as follow:

Volume of drink mix = 10 mL

Total volume of solution = 60 mL

Percentage of drink mix =?

Percentage of drink mix = Vol. of drink mix / total volume × 100

Percentage of drink mix = 10/60 × 100

Percentage of drink mix = 16.7%

4 0

3 years ago

Science Tectonic Plates Cause and Effect (Converge, Diverge and Transform)

marusya05 [52]

When convergent happens:
•Deep ocean trenches
• volcanoes
• mountains
• earthquakes

When divergent occurs:
• new oceanic crust forms
• submarine mountain range
• volcanoes
• earthquakes

When transform occurs:
• faults
• earthquakes
• linear valleys
• stream beds split in half

3 0

3 years ago

Helium decays to form lithium.

hjlf

Answer:

Natural nuclear disintegration.

Explanation:

This is because it cannot be managed, like it needs no energy particle yo occur, so its natural for helium to decay.

But it is nuclear because helium decays to release an energy particle (Beta particle).

7 0

3 years ago