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natima [27]
3 years ago
14

This element is added to table salt to prevent the development of a goiter ( enlargement of the thyroid gland

Chemistry
1 answer:
Leviafan [203]3 years ago
3 0
Iodine is the element that is added to table salt to prevent the development of a goiter.
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the decomposition of calcium carbonate to calcium oxide and carbon dioxide only takes place at very high temperatures, making th
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So calculate the H for the other two reactions a room temperature and combine the reactions to calculate the H of the decomposition of calcium carbonate using the Hess's Law
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How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containi
Vsevolod [243]

Answer:

fijhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Explanation:

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What happens to the number of valence electrons as you move from element 1 to element 18 on the periodic table?
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Answer:

B

Explanation:

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6 0
3 years ago
Read 2 more answers
Please help!
ANEK [815]

Answer:

A- Physical, B- Chemical, C- chemical, D- Physical

Explanation:

A is physical because you can see it changing its form is changing.

B is Chemical because a new substance is formed creating the orange color of rust.

C is a Chemical reaction because it is being broken down so the banana itself is changing not just how we see it.

D is physical because we are just changing the shape/ size of the item, not anything to do with its substances.

8 0
2 years ago
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A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If
VMariaS [17]

Answer:

41.9 g

Explanation:

We can calculate the heat released by the water and the heat absorbed by the steel rod using the following expression.

Q = c × m × ΔT

where,

c: specific heat capacity

m: mass

ΔT: change in temperature

If we consider the density of water is 1.00 g/mol, the mass of water is 125 g.

According to the law of conservation of energy, the sum of the heat released by the water (Qw) and the heat absorbed by the steel (Qs) is zero.

Qw + Qs = 0

Qw = -Qs

cw × mw × ΔTw = -cs × ms × ΔTs

(4.18 J/g.°C) × 125 g × (21.30°C-22.00°C) = -(0.452J/g.°C) × ms × (21.30°C-2.00°C)

ms = 41.9 g

3 0
3 years ago
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