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Shkiper50 [21]
4 years ago
9

What information can be learned from bloodstains at a crime scene?

Chemistry
1 answer:
tangare [24]4 years ago
3 0

you can learn who's blood it is, you can also see the blood patterns and how the crime maybe happened.

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What is the concentration of the hydroxide ion? Given that the concentration of the hydronium ion is 2.3 X 10^-7 M
professor190 [17]

Answer:

4.35 * 10^-8 M

Explanation:

Since the concentration of the hydronium ion= 2.3 X 10^-7 M

And we know that;

[H3O^+] [OH^-] = 1 * 10^-14

[H3O^+]  = concentration of the hydronium ion

[OH^-] = concentration of the hydroxide ion

So;

[OH^-] =1 * 10^-14/[ H3O^+]

But [H3O^+] = 2.3 X 10^-7 M

[OH^-] = 1 * 10^-14/2.3 X 10^-7

[OH^-] = 4.35 * 10^-8 M

8 0
3 years ago
Which is produced when a base reacts with water?
MrRissso [65]

Answer:

d

Explanation:

3 0
4 years ago
How many dekagrams are in a kilogram​
Norma-Jean [14]

Answer:

1=100 1 Kilogram (kg) is equal to 100 dekagrams (dag). To convert kilograms to dekagrams, multiply the kilogram value by 100.

Explanation:

3 0
1 year ago
The law of reflection states that if the angle of incidence is 43 degrees, the angle of reflection is ___ degrees.
Vesna [10]

43 degrees

angle of reflection is equal to the angle of incidence

4 0
3 years ago
0.1 dm³ of argon contains x atoms .How many atoms are there in 0.2 dm³ of hydrogen gas under the same conditions?
svetoff [14.1K]

Answer:

B.) 2x

Explanation:

Hello,

In this case, we can apply the following rule of three, knowing that 0.1 dm³ equals x and 0.2 dm³ is the unknown:

0.1dm^3\longrightarrow x\\0.2dm^3 \longrightarrow ?

Thus, solving for the unknown we find:

?=\frac{0.2dm^3*x}{0.1dm^3} \\\\?=2*x

Therefore, the answer is B.) 2x.

Best regards.

8 0
3 years ago
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