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Oksana_A [137]
3 years ago
8

HELP ASAP!!!

Chemistry
1 answer:
Alborosie3 years ago
6 0

Answer:

The law of conservation of mass states that mass cannot be created or destroyed only transfered. So when a size change takes place the mass is being transfered into something else. During a state change the mass is being transfered into another state of matter. When a substance dissolves into another liquid the mass is still their just into another state.

Explanation:

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What type of change is the following: striking a match chemical, or physical?
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4 years ago
What is the concentration in mol L-l of a 12% solution of tetrahydrate magnesium chloride (MgCl2)?
madreJ [45]

The concentration in mol L-l (M) = 0.717

<h3>Further explanation</h3>

Given

12% solution of tetrahydrate magnesium chloride (MgCl₂)

Required

The concentration

Solution

Tetrahydrate magnesium chloride (MgCl₂)⇒MgCl₂.4H₂O

MW = Ar Mg+2. Ar Cl+8. Ar H + 4. Ar O

MW=24.31 + 2 x 35.45 + 8 x 1.01 + 4 x 16

MW=24.31+70.9+8.08+64

MW=167.29 g/mol

12% solution = 12 % m/v = 12 g in 100 ml solution

For 1 L solution :

\tt \dfrac{1}{0.1}\times 12~g=120~g

The concentration in g/L = 120 g/L

Convert grams to moles :

\tt mol=\dfrac{120}{167.29}=0.717

3 0
3 years ago
Write the chemical formula for each:
Mkey [24]

Answer:

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potassium sulfide is K2S

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