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maks197457 [2]
3 years ago
13

Which statement about the mass of an electron is correct? A The mass of an electron is equal to the mass of the proton. B The ma

ss of an electron is less than the mass of the proton. с The mass of an electron is equal to the mass of a neutron. D The mass of an electron is greater than the mass of a neutron.​
Chemistry
1 answer:
geniusboy [140]3 years ago
8 0

Answer:

B

Explanation:

because mass of an electron is 1/2000.

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What is the total number of elements in group 17 that are gases at room temperature and standard pressure?
White raven [17]

Answer:

Only to elements are gases at room temperature and standard pressure.

Fluorine and chlorine.

Explanation:

The group 17 is called halogen.

There are five elements in halogen group.

All halogens required one electrons to complete the octet and to get the noble gas electronic configuration.

All halogen elements have seven valance electrons.

Halogen elements:

Fluorine, chlorine, Bromine, iodine and astatine

Fluorine is gas at room temperature which s 25°C and standard pressure which is 1 atm.

It is present in the from of F₂.

Chlorine is also gas at room temperature and standard pressure.

It is present in the from of Cl₂.

The bromine is liquid under these condition.

Iodine and astatine are solids.

As we move down the group their melting and boiling points increases.

4 0
3 years ago
Express 250,000 mL in liters.<br> A) 0.25 L <br> B) 2,500 L <br> C) 25 L <br> D) 250 L
elena-s [515]
D) 250l
Explanation :
250,000/1000
5 0
3 years ago
Read 2 more answers
What is an ionic compound that contains only non metallic elements?
notka56 [123]
<span>it must be a compound of a polyatomic cation (i think ammonium might be the only</span>
4 0
4 years ago
Which letter? Thanks in advance!
Mashcka [7]

Answer: b

Explanation:

7 0
3 years ago
g 10.00 mL of phosphoric acid (H3PO4) are titrated with 0.1000 M sodium hydroxide. 15.00 mL of the sodium hydroxide solution are
aliya0001 [1]

<u>Answer:</u> The molarity of phosphoric acid is 0.05 M

<u>Explanation:</u>

A neutralization reaction is defined as the reaction in which an acid reacts with a base to form a salt and water molecule.

At equivalence, moles of acid becomes equal to the moles of base. The equation for the neutralization follows:

n_1M_1V_1=n_2M_2V_2              ........(1)

where,

n_1, M_1\text{ and }V_1 are the n-factor, molarity and volume of acid that is H_3PO_4

n_2, M_2\text{ and }V_2 are the n-factor, molarity and volume of the base that is NaOH

Given values:

n_1=3\\M_1=?M\\V_1=10.00mL\\n_2=1\\M_2=0.1000M\\V_2=15.00mL

Plugging values in equation 1:

3\times M_1\times 10.00=1\times 0.1000\times 15.00\\\\M_1=\frac{1\times 0.1000\times 15.00}{3\times 10.00}\\\\M_1=0.05M

Hence, the molarity of phosphoric acid is 0.05 M

6 0
3 years ago
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