The range in size of most atomic radii is approximately _____.5 × 10−11 m to 2 × 10−10 m
2 to 5 nm
5 × 10−21 m to 2 × 10−20 m
2 to 5 cm

Answers

Answer 1

Answer:

The atomic radii is approximately between 5 × 10−11 m to 2 × 10−10 m

Answer 2

Answer: The range in size of most atomic radii is approximately 5 × 10−21 m to 2 × 10−20 m. The rest of the choices do not answer the question above.

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Which of the following would most likely result in an increase in reaction rate? placing the reactants on a hotplate placing the reactants in an ice bath
placing the products in an ice bath

Answers

Answer:

placing the reactants on a hot plate

Explanation:

If the temperature goes up, the reaction rate will increase. Because the particle will move faster and makes the kinetic energy larger.

If the solvent front is 68 mm and the ring front of an unknown is 48mm from the original spot, what is the rf value?

Answers

Given:

Distance of solvent front = 68 mm

Distance of unknown = 48 mm

To determine:

The rf value

Explanation:

The retention factor or the rf value is given by the ratio of distance traveled by the unknown to the distance traveled by the solvent front

RF = distance by unknown/distance by solvent

RF = 48/68 = 0.706

Ans: the RF value is 0.706

Final answer:

The Rf (Retention factor) value can be calculated using the given distances traveled by the solvent and the substance. The Rf value in this case is approximately 0.71.

Explanation:

The Rf value or Retention factor value in chromatography can be calculated with the given parameters of solvent front and the distance the substance travelled from the original spot. The formula to calculate the Rf value is: Rf = distance traveled by the substance / distance traveled by the solvent. So, in this case, it would be: Rf = 48mm / 68mm which is approximately 0.71.

Learn more about Rf Value here:

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Which statement about one atom of an element identifies the element?(1) The atom has 1 proton. (2) The atom has 2 neutrons.(3) The sum of the number of protons and neutrons in the atom is 3.(4) The difference between the number of neutrons and protons in the atom is 1.

Answers

the atom has one proton

What do you think will happen to the ecosystem if all the coral reefs are destroyed?

Answers

Animals that rely on coral for protection and cover, such as grouper, snapper, oysters and clams, would also be negatively impacted. And because this marine life is a vital staple in many peoples' diets, the death of the coral reefs would exacerbate the problem of feeding these groups [source: Skoloff].

Oversteepened slopes often lead to mass movements becauseA. the angle of their slope is between 50 and 60 degrees.
B. plants cannot grow on them.
C. the angle of their slope is less than 50 degrees.
D. the angle of their slope is greater than 40 degrees.

Answers

The right answer is D.

The slopes are differentiated by the following criteria:

*The inclination;

*The orientation;

*The shape of the slope.

The slope can be measured by degrees or percentages. In the mountains, it is necessary to measure the inclination of a slope by degrees and not by percentages of inclination.

to make the conversion it is necessary to consider that a slope of 45 ° equals a slope of 100%.

D. the angle of their slope is greater than 40 degrees.

Oversteepened slopes often lead to mass movements because the angle of their slope is greater than 40 degrees.

NOT:
A. the angle of their slope is between 50 and 60 degrees.
B. plants cannot grow on them.
C. the angle of their slope is less than 50 degrees.

Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH–] is 1 x 10–11 mol/L. Is this solution acidic, basic, or neutral? Show all work.

Answers

If we have $[H+][OH-]= Kw = 1.0 x 10^-14$
Then $[H+]= Kw/ [OH-]= 1.0x 10^-14$ $/ 1 x 10^-11 =1 x 10^-3 mol/L$
And here is the solution - as you can see it is an acidic one :
$pH = - log [H+]= - log 1 x 10^-3 = 3 \ \textless \ 7$

I am pretty sure this answer will help you! Regards.

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