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3 years ago

List 2 everyday situations in which it would be useful to identify unknown substances.

1 answer:

7 0

TESTS USED-
Spectroscopic method is used to determine unknown substances found in wildlife waters.

IMPORTANCE-
<span>To control the quality of fish.

</span>TESTS USED -
Blood or urine tests are used for analysis
Gas chromatography is the most common method of chemical analysis

IMPORTANCE -
<span>to avoid cheating in sports</span>

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I don't know how to do any of these.plz help.its a study guide for my chemistry exam tomorrow ✌

Vladimir [108]

6.02 x 1023 atoms weigh out 63.55 grams copper.

No. of Molecules in water = 3.5mole x (6.02 x 10^23) molecules/mole = 2.107 x 10^24 molecules of H2O

8 0

3 years ago

A coefficient is a number listed before a compound or atom, telling how many of the compounds are needed so that the Law of Cons

mezya [45]

Answer:

See explanation

Explanation:

The law of conservation of mass states that mass can neither be created nor destroyed. This implies that in a chemical reaction, we can only have the same number of atoms of each element on both sides of the reaction equation.

If we write 4Fe2S3 it means that we have;

4 * 2 = 8 atoms of Fe

4 * 3 = 12 atoms of S

8 + 12 = 20 atoms in all

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3 years ago

Give the chemical symbol for the element with the ground‑state electron configuration [ Ar ] 4 s 2 3 d 1 . symbol: Determine the

Rus_ich [418]

Answer:

Sc (Scandium) has the given electronic configuration.

Explanation:

The given electronic configuration is [Ar] $4s^{2}3d^{1}$ .

The last electron enters the d-subshell and hence is a d-block element known as Scandium with chemical symbol Sc.

For 4s subshell

n=4,l=0 and m ranges from -l to +l so m=0.

For 3d subshell

n=3,l=2 and m ranges from -l to +l so m can take values -2,-1,0,+1,+2

Note:

l values for subshells:

s : 0

p : 1

d : 2

f : 3 and so on.

5 0

2 years ago

• If 2.5 moles of sugar are added to 2.0 L of a water/lemon juice solution, what is the molarity of the lemonade?

d1i1m1o1n [39]

The answer is 4.5 because you add rhem

6 0

3 years ago

What is the number of electrons that can be held in the first orbit closest to the nucleus

Juliette [100K]

The first shell can hold up to 2 electrons, the second shell can hold up to 8 (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

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3 years ago