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enyata [817]
3 years ago
13

Which statement is true?

Chemistry
1 answer:
LenaWriter [7]3 years ago
3 0
I think the last one but I’m not sure
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if the half-life of substance A is 1.5 years, how long would it take a 8.0 gram sample of substance A to decay such that only 1.
Fudgin [204]

Answer:

4.5

Explanation:

3 0
3 years ago
Which of the following weighs least?
Lunna [17]

Answer:

A

Explanation:

0.2g of atom of nitrogen is the one that weigh least cause of.2g is not up to one mole of nitrogen

7 0
3 years ago
10 pts) A student titrates a 20.00 mL sample of an aqueous borax solution with 1.03 M H2SO4. If 2.07 mL of acid are needed to re
Natasha2012 [34]

Answer: The molarity of the borax solution is 0.107 M

Explanation:

The neutralization reaction is:

Na_2B_4O_7.10H_2O+H_2SO_4(aq)\rightarrow Na_2SO_4+4H_3BO_3+5H_2O

According to neutralization law:

n_1M_1V_1=n_2M_2V_2

where,

n_1 = basicity of H_2SO_4 = 2

n_2 = acidity of borax = 2

M_1 = concentration of H_2SO_4 = 1.03 M

M_2 = concentration of borax =?

V_1 = volume of H_2SO_4  = 2.07ml

V_2 = volume of borax = 20.0 ml

Now put all the given values in the above law, we get the molarity of borax:

(2\times 1.03\times 2.07)=(2\times M_2\times 20.0)

By solving the terms, we get :

M_2=0.107M

Thus the molarity of the borax solution is 0.107 M

7 0
3 years ago
Given the following cations, list them in the expected order from smallest to largest: Y3+, Nb3+, Sb3+
Ugo [173]

<u>Answer:</u> Antimony ion is the smallest and yttrium ion is the largest.

<u>Explanation:</u>

Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

An ion is formed when a neutral atom looses or gains electrons.

  • When an atom looses electrons, it results in the formation of positive ion known as cation.
  • When an atom gains electrons, it results in the formation of negative ion known as anion.

As moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Hence, the size of an atom decreases.

The size of the cation is small then their neutral atom because it has less number of electrons while its nuclear charge remains the same. Thus, the nucleus attracts the electron more towards itself and leads to the decrease in size.

We are given three cations:  Y^{3+},Nb^{3+}\text{ and }Sb^{3+}

Yttrium lies in Period 5, group 3 of the periodic table.

Niobium lie in Period 5, group 5 of the periodic table.

Antimony lies in Period 5, group 15 of the periodic table.

So, the order of atomic radii in increasing order follows:

Sb^{3+}

Hence, antimony ion is the smallest and yttrium ion is the largest.

6 0
3 years ago
If sodium (Na) has 4 neutrons, 3 protons, and 2 electrons, which would be the correction symbol?
Alborosie

Answer:

Na+1

Explanation:

5 0
2 years ago
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