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3 years ago

Which of these is common to all chemical changes?

Chemistry

1 answer:

allsm [11]3 years ago

3 0

Answer: Option (C) is the correct answer.

Explanation:

A chemical change is a change which brings change in chemical composition of a substance or reactant(s).

Thus, we can say the due to change in composition we get a new product.

For example, $Na + Cl \rightarrow NaCl$

That is, NaCl is the new product formed.

Hence, we can conclude that common to all chemical changes is that a new substance is produced.

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I know there are 4.5*10^-9 seconds in 4.5 nanoseconds, but when I enter it into my TI-30xIIs, I get 4.5*10^-10. I enter it as 4.

o-na [289]

Answer:

You are not using properly the function exponential in your calculator

Explanation:

When a number is too big or too small we use scientific notation. This is a number between 1 a 10 multiplied by a power of 10.

When you are writing 4.5*10^-9 you are actually writing 0.0000000045 in scientific notation.

When you enter this in the calculator you have to use the function EXP after the first two numbers.

Steps: 1) Enter 4.5

2) Enter EXP

3) Enter minus (-)

4) Enter 9

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4 years ago

In the gas egquation PV=RT, V stands for volume of

Wittaler [7]

Ans: B . 1 mole of gas

Explanation:

...

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3 years ago

What is the pH of a solution with (H+) =2.3x10 -6

castortr0y [4]

P
H
=
−
log
10
[
H
3
O
+
]
=
−
log
10
{
2.3
×
10
−
6
}
=
−
{
−
5.64
}
=
5.64

5 0

2 years ago

What important points do you need to remember about combustion?

goldenfox [79]

Explanation:

A substance burning in the presence of oxygen and leads to the formation of heat and light is called combustion.

Some important points about combustion are as follows:

Fuel should be present for burning.
Air should be present for the supply of oxygen.
There should be heat (or ignition temperature) to initiate the chemical reaction.

7 0

3 years ago

Which ranks the solutions from the strongest to weakest acid?

Norma-Jean [14]

Answer:

the answer is the last option yzxw

Explanation:

ph is stronger the lower

4 0

3 years ago

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