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liq [111]
3 years ago
5

CH 4 History and Structure of the Atom

Chemistry
1 answer:
Butoxors [25]3 years ago
5 0

Answer:

a) Cl, 17 protons and 17 electrons

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. The atomic number of chlorine is 17. Its means it has 17 protons and 17 electrons.

The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom. Thus the atomic mass of chlorine will be 17+18 = 35 amu

Number protons = 17

Number of electrons = 17

Number of neutrons = 18

Properties of Chlorine:

1. it is greenish-yellow irritating gas.

2. its melting point is 172.2 K

3. its boiling point is 238.6 K

4. it is disinfectant and can kill the bacteria.

5. it is also used in manufacturing of paper, paints and textile industries.

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In everyday speech the words precision and accuracy are often used interchangeably. When these terms are used in science are the
padilas [110]

Answer:

            No, in science their meanings are not the same as their everyday meanings.

Explanation:

                   In Science, Precision and Accuracy are defined as,

Accuracy:

               Accuracy is the value which is closest to the known or standard value.

Precision:

                While, Precision is the value of closeness of two measured values to each other.

Example:

             Let suppose in Chemistry Lab you weight an object as 50 g. While the actual weight of that object is 30 g. It means your reading is not accurate.

             On second measurement you find that the object weight is 31 g. This time your reading is not precise.

3 0
3 years ago
Upon balancing the equation below, how many moles of sulfuric acid are needed to react completely with 8.4 moles of lithium hydr
maks197457 [2]
The answer is b. 4.2 mole. The balanced reaction formula is 2LiOH + H2SO4 -->Li2SO4 + 2H2O. And the ratio of mole number of the reactants is the same as the ratio of coefficients.
7 0
3 years ago
Is the sky a solid liquid or gas
s2008m [1.1K]
Gas.
The sky is not solid, not liquid but of gas. It is also called the atmosphere, one of the important spheres on earth that influences the climate –temperature, humidity, precipitation, atmospheric pressure, and the biotic community as a whole. The atmosphere or the sky is composed of many layers and is responsible to protecting the living organisms of the earth against the deadly ultraviolet rays and other strong radiation coming from the sun.



6 0
3 years ago
Read 2 more answers
I Need help ASAP!
8090 [49]

Answer:

The correct answers are:

• Softer, porous, or more permeable rocks weather faster than harder rocks.

• Rocks in warmer climates weather faster than rocks in colder climates.

• The more water present, the faster the rate of weathering.

Explanation:

Weathering is the process through which the surface minerals of rock are broken down and loosened. This occurs through the action of extreme temperatures, rainwater and biological activity.

Hope this helps- Good luck ^w

4 0
3 years ago
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An air conditioning unit turns off once it reaches its goal temperature. The house warms up and the air conditioning unit turns
-Dominant- [34]

Answer:

D ) feedback

Explanation:

When we use an air conditioner, it get turn off when reaches its required temperature and when the house warm up the air conditioning unit turns on again, that is an example of feedback.

The given condition is an example of negative feedback because in negative feedback, any change in the input is opposed by generating an output. Here also,  warming up of house (change in one direction) allows the air conditioning unit turns  on and it gives cool air (opposing that change).

Hence, the correct option is "D".

4 0
3 years ago
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