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svp [43]
3 years ago
14

What are some signs that a chemical change takes place when a firework explodes? Matter is destroyed Light is produced Heat is p

roduced The chemical composition is not changed
Chemistry
1 answer:
Radda [10]3 years ago
4 0
Well, the answer relies on all four factors, I mean on all options. So, the answer is A, B, C, and D.
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Which property is the same for a 50 mL sample of liquid water and a 100 mL sample of liquid water?
Brums [2.3K]

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4 0
2 years ago
1. A substance, A₂B, has the composition by mass of 60% A and 40% B. What is the composition of AB₂ by mass?
Lubov Fominskaja [6]
This may help you
Use an arbitrary mass, 100 g is an easy number to work with. 60% of 100 g is 60 g, there are two A's. Each A is 30 g 40 g is B, and there is only one, so B is 40 g. <span>A<span>B2</span></span>, would have a mass of 30 g + 2*40 g = 110 g The new percent by mass composition of A is: <span><span><span>30g</span><span>110g</span></span>∗100%=27.3%</span> The new percent by mass composition of B is: <span><span><span><span>80g</span><span>110g</span></span>∗100%=72.7%</span></span>
8 0
3 years ago
Explain Newton's second law​
zhenek [66]

Answer:

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Explanation:

5 0
3 years ago
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A sample of ideal gas is in a sealed container. The pressure of the gas is 505torr, and the temperature is 43 degree celsius. If
Contact [7]
Use PV=nRT to find V assuming n is one and R= 8.31 then use the answer to find P2
8 0
3 years ago
Help I’m stuck on this question :
Dimas [21]

Answer:

The first ionization energy is the energy it takes to remove an electron from a neutral atom.

hope it is helpful :)

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3 years ago
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