CHEMISTRY HIGH SCHOOL

From which of the following do spiral galaxies form? A.rapidly cooling protogalactic clouds
high-density protogalactic clouds
rapidly spinning protogalactic clouds
colliding/merging protogalactic clouds

Answers

Answer 1
Answer: The correct answer to the question that is stated above is the third option which is: rapidly spinning protogalactic clouds 

One example of a spiral galaxy is the Milky Way. Spiral galaxies came from a rapidly spinning protogalactic clouds. Spiral galaxies form from the collapse of a protogalactic cloud. 

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Which elements can form acidic compounds? Check all that apply. sulfur rubidium arsenic selenium silicon xenon antimony

Answers

The elements that can form acidic compounds are; sulfur, arsenic, selenium, antimony, silicon.

Acidic compounds are formed by nonmetals. Metallic elements form basic compounds. This means that rubidium does not form acidic compounds since it is a metal.

Also, xenon does not form compounds because it is a noble gas. Noble gases do not react with other elements to form compounds.

However; sulfur, arsenic, selenium, antimony, silicon are nonmetals and they form acidic compounds.

Learn more: brainly.com/question/14072179

The correct answer is Sulfur, Arsenic, selenium, silicon, and antimony.

Solids, liquids, and gases can be distinguished by their

Answers

The three states of matter are solid, liquid and gas phase. The solid has a more definite shape and volume. The particles are locked into place. It cannot be further compressed due to the bond that exists between the molecules. The kinetic energy of the molecules is close to none because the molecules are so close and so compact with each other. For liquids, it has a medium shape and volume. The particles can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. The kinetic energy is medium. For gases, it has no shape and volume because the particles can move freely from one other. Their collisions are rare due to the distance between them. The kinetic energy of the molecules is high because there is room for movement. It can be compressed easily.

Which element is the most reactive?
sodium, nickel, carbon, or oxygen

Answers

Answer : Option A) Sodium

Explanation : Sodium is the element which is most reactive tin the given options.

Sodium has the atomic number as 11, which is distributed in the atomic shells as 2-8-1.

So, it is clear that the outermost valence shell contains only one electron in sodium. To give away one electron and attain the octet state is easy for sodium. If it donates the electron it becomes a cation which is very reactive, as it gets a positive charge on itself.

Compared to the valency of the other atoms given here, Nickel has 2 valence electrons so it will be less reactive than Sodium.

Carbon has 4 valence electrons which is less than sodium and oxygen needs 2 electrons to be an octet which is also less.
Sodium will be the most reactive as it is a metal lying in the first period and has a valence electron that is readily lost.

Which is the correct expression for Keq when the chemical reaction is as follows:N2 + 3H2 2NH3.

Answers

Answer : The expression for equilibrium constant will be,

K_(eq)=\fac{[NH_3]^2}{[N_2][H_2]^3}

Explanation :

Equilibrium constant : It is defined as the number of ratio of the concentration between the products and the reactants at equilibrium.

The equilibrium reaction is,

aX+bY\rightleftharpoons cW+dZ

The general expression for equilibrium constant will be,

K_(eq)=([X]^a[Y]^b)/([W]^c[Z]^d)

The given balanced chemical reaction will be,

N_2+3H_2\rightleftharpoons 2NH_3

The expression for equilibrium constant will be,

K_(eq)=([NH_3]^2)/([N_2][H_2]^3)
The expression of the Keq is [NH3]2/([N2][H2]3). The common formula of reaction: ax+by=cz is Keq - [z]c/([x]a*[y]b). Remember to use a balanced chemical reaction.

When magnesium ribbon is ignited, it gives off a white fume of magnesium oxide. What is this type of reaction? synthesis reaction double displacement reaction decomposition reaction single displacement reaction

Answers

It is an oxidation reaction 

The molecular formula of glucose is C6H12O6. What is the empirical formula of glucose?(1) CHO (3) C6H12O6
(2) CH2O (4) C12H24O12

Answers

The answer is (2) CH2O. The empirical formula means the simplest positive integer ratio of the atoms in the compounds. You can get this form form the molecular formula, divided by 6 for each atom.
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