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QveST [7]
3 years ago
11

Which of these is a common to all chemical changes

Chemistry
2 answers:
Kamila [148]3 years ago
5 0
C. A new substance is produced. All others are physical changes.
KiRa [710]3 years ago
3 0

Answer:

c

a new substance is produced

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How many moles of butane (C4H10) must be burned in an excess of O2 to produce
Sedbober [7]

Answer: 6,25 moles

Explanation: mark amount of butane x.

From equation you can calculate x in a following way:

2/x = 8/25. 8x = 50. And x = 6,25

4 0
3 years ago
Help Please!!!!!!!!!!
Shkiper50 [21]

Answer:

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Explanation:

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4 0
3 years ago
57. A recipe for s'mores calls for 2 graham crackers, 2 chocolate pieces and 1 marshmallow. If I
geniusboy [140]

Answer:Noble gases:

 are highly reactive.

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 do not appear in the periodic table.

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Explanation:Noble gases:

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 do not appear in the periodic table.

 are not very reactive with other elements.

5 0
2 years ago
Cal is titrating 50.8 mL of 0.319 M HBr with 0.337 M Ba(OH)2. How many mL of Ba(OH)2 does Cal need to add to reach the equivalen
alexgriva [62]

Answer:

V_{base}=24.04mL

Explanation:

Hello!

In this case, according to the chemical reaction by which HBr reacts with Ba(OH)2:

2HBr+Ba(OH)_2\rightarrow BaBr_2+2H_2O

We can see there is a 2:1 mole ratio between the acid and the base; thus, at the equivalent point we can write:

2M_{base}V_{base}=M_{acid}V_{acid}

Therefore, for is to compute the volume of the used base, we proceed as shown below:

V_{base}=\frac{M_{acid}V_{acid}}{2M_{base}}

And we plug in to obtain:

V_{base}=\frac{0.319M*50.8mL}{2*0.337M}\\\\V_{base}=24.04mL

Best regards!

8 0
3 years ago
Solids or liquids are not included in an equilibrium expression because:
Harlamova29_29 [7]
I believe the answer is D
7 0
3 years ago
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