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rosijanka [135]
3 years ago
12

Which of the following is a physical change. A piece of magnesium metal formed bubbles when dropped in acid

Chemistry
1 answer:
uysha [10]3 years ago
3 0

H2O became a vapor when heated because thats the only one that can go back to its normal state, which is what a physical change is.


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typical seawarer contains 2.7g of salt (sodium chloride,Nacl)per 100ml (100*10-3L).what is the molarity of Nacl in the ocean?​
faust18 [17]

Answer:

Molarity = 0.5 M

Explanation:

Given data:

Mass of NaCl = 2.7 g

Volume = 100 mL(100×10⁻³L)

Molarity of solution = ?

Solution:

Formula:

Molarity = number of moles / volume in litter

Number of moles:

Number of moles = mass/ molar mass

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Number of moles = 0.05 mol

Molarity = number of moles / volume in litte

Molarity = 0.05 mol / 100×10⁻³L

Molarity = 0.5 M

4 0
3 years ago
How does the photoelectric effect show that light has some properties of a stream of particles.
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8 0
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Vitek1552 [10]
This is the equation balanced:

<span>BaCl2(aq) + Na2CO3(aq) = BaCO3(s) + 2 NaCl(aq)

Then the coefficient in front of Na Cl is 2.

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Which animal is a secondary consumer in the temperate coniferous forest?
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Another way of writing 0.00000731 g
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