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larisa86 [58]
3 years ago
12

Which one represents an element

Chemistry
2 answers:
malfutka [58]3 years ago
8 0
The answer is B

Explanation :
I hope this helped u
irakobra [83]3 years ago
6 0

Answer:

<em>B</em>

Explanation:

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Why does the titration of a weak acid with a strong base always have a basic equivalence point? Why does the titration of a weak
CaHeK987 [17]

Answer: Option (c) is the correct answer.

Explanation:

When a weak acid reacts with a strong base then it results into the formation of a basic solution. Hence, the resulting solution will always have a pH greater than 7.

Since, at the equivalence point number of hydrogen ions become equal to the hydroxide ions. Therefore, pH of solution will be about 7.

So at the equivalence point, the weak acid will get neutralized due to the addition of strong base. Therefore, it will lead to the formation of conjugate base.

As a result, the solution will become slightly basic in nature.

Thus, we can conclude that at the equivalence point, the acid has all been converted into its conjugate base, resulting in a weakly acidic solution because at the equivalence point, the acid has all been converted into its conjugate base, resulting in a weakly basic solution.

5 0
3 years ago
which are correct formulas for ionic compounds? for those that are not correct, give the correct formula and justify your answer
galina1969 [7]

Answer:

a. AlCl is incorrect because Al has a +3 charge while Cl only has a -1 charge. The correct formula would be AlCl₃. This balances the charges.

b. Na₃SO₄ is incorrect because Na has a charge of +1 and there are three of them so its +3 and SO₄ has a charge of -2. The correct formula would be Na₂SO₄. This balances the charges.

c. BaOH₂ is incorrect because the polyatomic ion OH would not be written that way. It would be written like this Ba(OH)₂. Writing it like BaOH₂ gives the impression that instead of having 2 OH it has 2 H and 1 O.

d. Fe₂O is incorrect because Fe either has a +2 charge or +3 charge while O has a -2 charge. Possible correct answers could be FeO (iron (II) oxide) or Fe₂O₃ (iron (III) oxide).

4 0
3 years ago
(ii) When shale gas is burned, the hydrogen sulfide reacts with oxygen.
Elenna [48]

Answer:

See explanation

Explanation:

Now , we have the equation of the reaction as;

2H2S(g) + 302(g)------->2SO2(g) + 2H2O(g)

This equation shows that SO2 gas is produced in the process. Let us recall that this same SO2 gas is the anhydride of H2SO4. This means that it can dissolve in water to form H2SO4

So, when SO2 dissolve in rain droplets, then H2SO4 is formed thereby lowering the pH of rain water. This is acid rain.

4 0
3 years ago
What happens to an earthquake’s p-waves when they strike the liquid core?
padilas [110]

Answer:

They bounce off.

Explanation:

They change into S-waves. They change into R-waves.

6 0
4 years ago
a) A water sample (density=1.00g/mL, S=0.28g/kg) contains Ca(2+) at a concentration of 42 mg/kg. Calculate the molarity of the i
natali 33 [55]

Answer : The molarity of the ion is 1.05\times 10^{-3}M

Explanation : Given,

Density of sample = 1.00 g/mL

Concentration of Ca^{2+} = 42 mg/kg

First we have to calculate the volume of sample.

Let us assume that the mass of sample be 1 kg or 1000 g.

Density=\frac{Mass}{Volume}

1.00g/mL=\frac{1000g}{Volume}

Volume=\frac{1000g}{1.00g/mL}

Volume=1000mL=1L        (1 L = 1000 mL)

Now we have to calculate the moles of Ca^{2+}

As we are given that,

Mass of Ca^{2+} in 1 kg of sample = 42 mg = 0.042 g

Molar mass of Ca = 40 g/mole

\text{Moles of }Ca^{2+}=\frac{\text{Mass of }Ca^{2+}}{\text{Molar mass of }Ca^{2+}}=\frac{0.042g}{40g/mol}=1.05\times 10^{-3}mol

Now we have to calculate the molarity of the ion.

\text{Molarity}=\frac{\text{Moles of }Ca^{2+}}{\text{Volume of sample}}

\text{Molarity}=\frac{1.05\times 10^{-3}mol}{1L}=1.05\times 10^{-3}mol/L=1.05\times 10^{-3}M

Therefore, the molarity of the ion is 1.05\times 10^{-3}M

8 0
3 years ago
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