Which is a diatomic molecule?
A. Ar
B. CO
C. CO2
D. NaCl

Answers

Answer 1

Answer: NaCI is the answer, in what my teacher taught me. Hope I helped :)

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Select the correct scientific notation form of this numeral using only 2 significant figures. 5,489.6654

What would happen to the entropy in the reaction 203(9) ► 302(g)?

Answers

What would happen to the entropy in the reaction 2O3(g) --> 3O2(g)?

It increases.

Answer:

Enthalpy and entropy. ... What would happen to the entropy in the reaction 2O3(g) 3O2(g)? It increases

What volume of oxygen at STP is required for the complete combustion of 100.50 mL of C2H2?

Answers

The given substance combusts following the reaction:

C2H2 + (5/2)O2 -> 2CO2 + H2O

Assume C2H2 is an ideal gas. At STP, 1 mol of an ideal gas occupies 22.4 L. Given 100.50 mL of C2H2, this means that there is 4.4866 x 10^(-3) mol. Combusting 1 mol of C2H2 consumes (5/2) mol of O2, then combusting the given amount of C2H2 consumes 0.01121 mol of O2. At STP, this amount of O2 occupies 251.25 mL.

Answer: 251.25 ml

Explanation: $2C_2H_2(g)+5O_2(g)\rightarrow 4CO_2+2H_2O$

According to Avogadro's law, 1 mole of every gas occupies 22.4 L at Standard temperature and pressure (STP).

2 moles of $C_2H_2(g)$ occupy = $2* 22.4L=44.8L=44,800ml$

5 moles of $O_2(g)$ occupy = $5* 22.4L=112L=112000ml$

Thus 44800 ml of $C_2H_2(g)$ reacts with 112000 ml of $O_2(g)$ at STP

100.50 ml of $C_2H_2(g)$ reacts with = $(112000)/(44800)* 100.50=251.25 ml$ of $O_2(g)$ at STP.

To prevent accidental poisoning, you should NOT __________.a. mix chemicals in well ventilated areas
b. follow the instructions on the label
c. keep materials in unlabeled containers
d. use chemicals in well ventilated areas

Answers

Answer: option C. keep materials in unlabeled containers.

Justification:

Indeed, keeping materials in unlabeled containers is a risky, dangerous, bad practice.

Labels should be according to international standards. That is, further to the name of the product, labels must signal the danger associated with the product: whether it is poison, toxic, flammable, acid, caustic, explosive, or harmful to the body or the enviroment.

On the other hand, the other options, a. mix chemicals in well ventilated areas, b. follow the instructions on the label, and d. use chemicals in well ventilated areas, are good safety practices, among many others.

Answer: C

Explanation:

Keep materials in unlabeled containers

What are energy sublevels? (A)multiple energy levels of any magnitude within an energy level
(B)multiple orbitals of specific magnitude within an energy level
(C)only those energy levels that overlap others
(D)electrons whose energy has dropped to a lower state

Answers

Answer:

Option B

Explanation:

First, we need to know what is an energy level.

An energy level corresponds to the row of the periodic table of element. So, if you see the attached picture, you can see that we have 7 rows where the elements are distributed, so, we have 7 energy levels for all those elements.

Knowing that, the sub levels are the caps where the electrons of the atoms are carried. These sublevels or caps, are called orbitals, these can be of several types

s orbytal: can hold 2 electrons

p orbytal: can hold up to 6 electrons.

d orbytal: can hold up to 10 electrons

f orbytal: can hold up to 14 electrons

g orbytal: can hold up to 18 electrons.

Depending on the row (or energy level) and the atom, we can know how many electrons can carry an element, in which period or row is, and the sub levels. For example, the Chlorine, with an atomic number of 17, can carry up to 7 electrons in it's outer level and it's on the third row (two energy levels). This can be known with it's electronic configuration:

[Cl] = 1s^2 2s^2 2p^6 3s^2 3p^5

The last energy level is 3, so it's the third period, and the electrons of those sub level are 2 and 5, 7 electrons.

Hope this can help better

The answer is B: multiple orbitals of specific magnitude within an energy level

The compound NacI is an example of a/an

Answers

The compound NaCI is an example of a salt. Salt is formed from a neutralization action of an acid and a base. From the type of reaction itself, we can say that the pH should be neutral or at pH 7.0. No matter what type of acid or base is used.

The compound NaCI is an example of a salt. Salt is formed from a neutralization action of an acid and a base.

Iron(III) sulfite has the formulaa) Fe₃SO₃
b) Fe₂(SO₄)₃
c) Fe₂(SO₃)₃
d) Fe₂SO₄
e) Fe₂SO₃