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Reil [10]
3 years ago
9

Which statement best describes a physical change?

Chemistry
1 answer:
worty [1.4K]3 years ago
3 0

C because it is only the chemical reaction which remain the same

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2 h2o ( g) 2 h2 (g) + o2 (g) kp = 7.8 × 10-16 at 930 k. give the value of kp for this reaction, if it is written as: 1/2o2 (g) +
trapecia [35]
When multiplying by a constant, raise Kp to the power of that constant.

When the reaction is reversed, it gives the inverse of Kp.

Kp^(-1/2) = (7.8 x 10^-16)^(-1/2) = 3.6 x 10^7
7 0
3 years ago
PLS PLS HELP ME!!!! thank you!!
sashaice [31]
Combustion releases energy from a fuel.

Carbon monoxide: (CO) is other type of carbon oxide produced from the combustion of fuel. It is produced when there is insufficient O2 (or oxygen),

4 0
3 years ago
If 20.0 grams of Na reacts with 30.0 gtams of Cl2 what mass of NaCl is produfed by the reaction
IgorLugansk [536]

Answer:

mNaCl = mNa + mCl

mNa = 20g

mCl = mCl2/2 = 30/2 = 15g

mNaCl= 20+15 = 35g

6 0
2 years ago
Why do people have swollen lymph nodes when they are sick?
Ray Of Light [21]
A. Bacteria are stored in the lymph nodes
5 0
3 years ago
Read 2 more answers
What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?
Harrizon [31]
First you need to find the balanced chemical formula.
CuCl₂+2NaNO₃→2NaCl+Cu(NO₃)₂

Then you can find out how much NaCl 31.0g of CuCl₂ should produce using stoichiometry.  Divide 31.0g by the molar mass of CuCl₂ (134.446g/mol) to get 0.2306mol CuCl₂.  Than multiply 0.2306mol CuCl₂ by 2 to get 0.4612mol NaCl.  Than multiply 0.4612mol by the molar mass of NaCl (58.45g/mol) to get 26.95g of NaCl.
that means that 100% yield would give you 26.95g of NaCl so to find percent yield divide 21.2 by 26.95 to get 0.7867 which is 78.7% yield

Therefore the answer is 78.7% yield.
I hope this helps.  Let me know if anything is unclear
3 0
3 years ago
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