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Zinaida [17]
4 years ago
13

Which statement best describes a physical change?

Chemistry
1 answer:
yulyashka [42]4 years ago
7 0
The answer is the third one .
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Adding a neutron to an atom changes what property of the atom?
GrogVix [38]
C, The atomic mass. This could also cause certain elements (i.e. Uranium, Plutonium) to radioactively decay in process called nuclear fission.
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3 years ago
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How many grams of Na2CO3 must be dissolved into 155g of water to create a solution with a molarity of 8.20 mol/kg
zhannawk [14.2K]

Answer:

135g Na2CO3

Explanation:

I'm going to assume you mean Molality which is mol solute/kg solvent

Molarity would be mol soute/ L solution

we know we have 155g of water which is .155 kg

essentially we have the equation:

mol/kg = 8.20

we substitute .155 in for kg and get:

mol/.155 = 8.20

Solving this  gives mol = 1.271

now we must convert to grams using the molar mass

Molar mass Na2CO3 = 106G/mol

so to cancel moles we multiply:

1.271mol x 106g/mol

= 135g

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3 years ago
jack tries to place magnets on his refrigerator at home, but they wont stick. what could be the reason?​
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3. How has the HST managed to withstand harsh space conditions and operate for
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Explanation:

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Explain the process of filtration and crystallization ​
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