CHEMISTRY HIGH SCHOOL

Which of the following has the most electrons?A) Sr^{2+}
B) Rb
C) Cl^{-}
D) Kr

Answers

Answer 1
Answer: Sr^(2+) = 36
Rb = 37
Cl^(-) = 18
Kr = 36

So the one with the most is (B) Rb

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C3H8 + 5O2 -> 3CO2 + 4H2OAccording to this equation, which ratio of oxygen to propane is correct? 1- 5 grams O2 / 1 gram C3H8 2- 5 moles O2 / 1 mole C3H8 3- 10 grams O2 / 11 grams C3H8 4- 10 moles O2 / 11 moles C3H8
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Which best explains why blood is considered to be a suspension?A)It has nutrients that cannot be dissolved
b)It contains particles that can settle out.
C)It has nutrients that are dissolved in its liquid portion.
D)It contains particles that mix on a molecular level.

Answers

I think the best answer is b): it contains particles that can settle out.

The definition of suspension is a heterogeneous (that is same in all parts) mixture that contains particles that could undergo sedimentation (settle down) - this definition is close to b). It should not matter whether those particles are nutrients( so A or C are not good answers).


Answer:

I think the best answer is b

Explanation:

I think the best answer is b

Which element has the greatest density at stp? 1. carbon 2. copper 3. chlorine 4. calcium

Answers

Copper will have the greatest density, followed by calcium, another metal. Carbon will be the third most dense followed by chlorine, which, as a gas, will be MUCH less dense than the other 3

Final answer:

Among carbon, copper, chlorine, and calcium, copper has the highest density at standard temperature and pressure.

Explanation:

The element with the greatest density at standard temperature and pressure (STP) among the options given (carbon, copper, chlorine, calcium) is copper. Density, in elemental terms, is determined by the amount of mass packed in a given volume. Copper (Cu) has a density of approximately 8.96 g/cm^3 at STP, which is greater than that of carbon, chlorine, and calcium.

For comparison:
Carbon(C) has a significantly lower density at about 2.26 g/cm^3, chlorine (Cl) is a gas at STP and has a very low density of 0.003214 g/cm^3, and calcium (Ca) has a density of about 1.55 g/cm^3 at STP.

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The difference between the boiling point of a pure solvent and the boiling point of a solution of a nonelectrolyte in the same solvent is called the ___________________, a colligative property.A. boiling-point elevation
B. freezing-point depression
C. molar freezing-point constant
D. molal melting-point constant
E. molal boiling-point constant

Answers

Answer: A) Boiling-Point Elevation

Which of the following is an oxidation-reduction reaction?Fe2O3 + 3CO mc009-1.jpg 2Fe + 3CO2
CuSO4 + 2NaOH mc009-2.jpg Cu(OH)2 + Na2SO4
2NaOH + H2CO3 mc009-3.jpg Na2CO3 + 2NaOH
Pb(NO3)2 + Na2SO4 mc009-4.jpg 2NaNO3 + PbSO4

Answers

I think the correct answer is the first chemical reaction given. The reaction, Fe2O3 + 3CO = 2Fe + 3CO2, represents an oxidation-reduction reaction. This type of reaction involves the gaining and losing of electrons of the elements involved in a reaction where it is essential that as one is losing some electrons, the other is gaining the electrons lost.

Answer:

The correct option is: Fe₂O₃ + 3CO → 2Fe + 3CO₂

Explanation:

An oxidation-reduction reaction, also known as the redox reaction, is a chemical reaction in which there is simultaneous transfer of electrons from one species to another.

The species that gains electrons gets reduced. Whereas, species that loses electrons gets oxidized.

Among the given options, only reaction 1 is a redox reaction:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Reason- In this reaction, iron (Fe) gains electrons and gets reduced from +3 oxidation state in Fe₂O₃ to 0 oxidation state in Fe. Whereas, carbon (C) loses electrons and gets oxidized from +2 oxidation state in CO to +4 oxidation state in CO₂.

Since both the oxidation and reduction reactions are occurring simultaneously.

Therefore, it is an redox reaction.

What is the electron configuration for helium (He)?A. 1s1
B. 1s2
C. 1s22s1
D. 1s22s2

Answers

The electronic configuration is the system of the electron distribution in the shells of the atom. The electronic configuration for He is 1s² as it is a noble gas. Thus, option B is correct.

What is electronic configuration?

The electronic configuration is the depiction of the electrons in the orbital level of the atoms around the nucleus. The electrons are distributed in the four orbitals namely, s, p, d, and f.

The orbitals have different sub-levels and can accommodate a different number of electrons. The electronic configuration of helium atom with atomic number 2 can be written as, 1s².

The s orbital can accommodate only two electrons in them and helium having only two electrons gets completely filled. Helium being the inert gas has the most stable configuration.

Therefore, 1s² is the electronic configuration of He.

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Answer:

B. 1s2

this is your answer....

1. Science is different than many other ways of thinking because it is based on-opinions
-facts
-personal viewpoints
-none of the above

Answers

Answer:

Facts

Explanation:

You can literally read the lesson it tells you science is

all about facts
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