How does a lithium cation compare to a lithium atom?

Answers

Answer 1

Answer: Hi Destromceler!

A lithium cation ion is smaller than a lithium atom. In lithium cation it has lost electrons, which causes the remaining electrons to be pulled in stronger by the positive charge in the nucleus. As they get closer to the nucleus decreases the overall size of the atom.

The bigger they are (the more electrons it has) the less effective the proton's pull will be. So if we were talking about a lithium anion (where electrons are gained) then it would be bigger than a lithium atom.

Answer 2

Answer:

Lithium cation and Lithium atom can be compared as follow;

1) Charge:

The charge on Lithium atom is zero means, it has same number of protons and electrons. Hence, the nert effect is cancelled out and the atom gets zero charge.

On the other hand, Lithium cation is formed when it looses one electron. Therefore, the number of protons are greater by one number as compared to number of electrons resulting in the formation of +1 charge as shown below,

Li → Li⁺¹ + e⁻

2) Size:

Secondly, Lithium atom has greater size as compared to Lithium cation because due to presence of greater number of protons compared to electrons in Lithium cation the nuclear charge appears to be greater as compared to neutral atom hence, pulling the valence electrons more effectively making the lithium cation smaller in size as compared to neutral atom.

3) Reactivity:

We can also compare the reactivity of both species. The neutral will be more reactive than the charged atom because it is containing one valence electron and can donate it when ever it comes in contact with non-metals.

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Which element has properties most similar to Bromine? A) F
B) Kr
C) S
D) Se

Answers

Fluorine (F) will have properties similar to Bromine (Br) because it belongs to the same group as Bromine.

the correct answer is flourine

A 34.87 g sample of a substance is initially at 27.1 C. after absorbing 1071 J of heat, the temperature of the substance is 145.0 C. what is the specific heat (SH) of the substance?SH=___ J / g * C

Answers

$H= (1071)/(34.87)*145\nH= (155295)/(34.87) \nH= (15529500)/(3487) \nH=4453.542$

Answer: .1044 J/g*C°

Explanation: The equation you need to use for this problem is :

c= q/m* ΔT

We are given

T1= 27.1 C°

T2= 145 C°

M= 34.87g

1071 J absorbed heatt

So let's solve specific heat

c= 1071J/ (87grams)*(145 C°- 27.1 C°)

c= 1071J/10,257.3 g*C°

c= .1044 J/g*C°

c=specific heat

A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?a. The concentration of Na⁺ ion rises.
b. The concentration of Cl⁻ ion will be 0.1M.
c. The concentration of undissociated H₂O molecules remains unchanged.
d. The pH of the beaker's contents will be neutral.
e. The pH of the beaker's contents falls.

Answers

Answer: Option (e) is the correct answer.

Explanation:

Since, the beaker contains NaOH solution whose pH is 13. As pH of NaOH is greater than 7 so, it means that this solution is basic in nature.

Whereas pH of HCl solution is equal to 1. As its pH is less that 7 so, it is acidic in nature.

Hence, when we add 10 ml of HCl into 100 mL of NaOH then there will be a slight decrease in pH of the solution because an acid is being added into the NaOH solution.

Thus, we can conclude that the statement pH of the beaker's contents falls, correctly describes the results of this mixing.

Aqueous solutions of this ion give a reddish precipitate when excess hydroxide ion is added.(A) Cu^{2+}
(B) CO₃^{2−}
(C) Fe^{3+}
(D) Al^{3+}
(E) Pb^{2+}

Answers

Fe ^3+ is the correct answer

Which is an example of a chemical change?mixing of poster colors
formation of clouds
metal corroding in salt water
sugar dissolving in water
separating salt from seawater

Answers

metal corroding in salt water corrosion is a chemical change

Answer: C. metal corroding in salt water

Explanation:

A catalyzed reaction will have a ____ activation energy, and this leads to a _____ in the reaction rate. A) lower, decrease
B) lower, increase
C) higher, decrease
D) higher, increase

Answers

I chose d and got it wrong. The correct answer is b.

The answer is D, a catalyst speeds up the reaction rate so a catalyzed reaction will have higher activation energy thus and increase in rate of reaction.

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