CHEMISTRY HIGH SCHOOL

Which is the noble-gas notation for lead (Pb)?[Rn]6s24f145d106p2

[Rn]6s25d106p2

[Xe]6s24f145d106p2

[Xe]6s25d106p2

Answers

Answer 1
Answer: I believe the correct answer from the choices listed above is the third option. The noble-gas notation for lead (Pb) would be [Xe]6s^2 4f^14 5d^10 6p^2. The standard electron configuration of lead is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^2 simplifying will lead to the part having the same configuration as xenon to be written as [Xe].
Answer 2
Answer:

Answer:

[Xe]6s24f145d106p2

Explanation:

jus took the quiz:)

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What is the percentage of nitrogen in N2O

Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N)
B. phosphorous (P)
C. sulfur (S)
D. oxygen (O)

Answers

Answer: Phosphorous

Explanation: Nitrogen(N): 7: 1s^22s^22p^3

Phosphorus(P): 15:1s^22s^22p^63s^23p^3

Oxygen(O): 8:1s^22s^22p^4

Sulphur(S): 16:1s^22s^22p^63s^23p^4

As nitrogen contains half filled configuration, it is stable and does not react. Phosphorous lies below nitrogen and reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Oxygen has 4 valence electrons, thus it need to gain two electrons to attain stable configuration. Thus is reactive.

Sulphur lies below oxygen and also need to gain two electrons. Reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.
Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.

Given the balanced equation representing a reaction:Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
This reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron
(1) acts as a better catalyst than the single piece of iron
(2) absorbs less energy than the single piece of iron
(3) has a greater surface area than the single piece of iron
(4) is more metallic than the single piece of iron

Answers

Answer: Option (3) is the correct answer.

Explanation:

One of the important factor on which rate of reaction depends is surface area. That is, when a compound is crushed into powdered form then there will be increase in surface area of the compound.

Hence, now more number of particles can interact, therefore, there will be increase in rate of reaction.

Thus, we can conclude that reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron has a greater surface area than the single piece of iron.

The Steller sea lion population has been decreasing in parts of Alaska. New evidence suggests that Steller sea lions need herring as a part of their diet in order to survive. Pollock, another type of fish, also feed on herring. Which would most likely help the Steller sea lion population to increase?

Answers

Answer:

Improving the habitats of herring thereby increasing their population.

Explanation:

First, two consumers (Steller sea lion and  Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.

The Steller sea lion population would increase if:

1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.

2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.

A sample of an element is malleable and can conduct electricity. This element could be(1) H (3) S
(2) He (4) Sn

Answers

Answer is: 4) Sn.

Tin (Sn) is only metal in this question and metals are malleable and can conduct electricity.

Metals have metallic bond.

1. Metallic bond is a type of chemical bond.  

2. Metallic bond is formed between electrons and positively charged metal ions.  

3. Metallic radius is defined as one-half of the distance between the two adjacent metal ions.  

4. Metallic bond increace electrical and thermal conductivity.  

5. Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.
The answer is (4) Sn. Malleability and conductivity are properties of metals, and Sn is the only metal of the four.

A molecule consisting of 100 amino acids has a molar mass of _____amu.a. 10,000
c. 1,000,000
b. 100,000
d. 10
What is the role of an enzyme?
a. speeds up biochemical reactions
b. causes biochemical reactions
c. is a product in biochemical reactions
d. provides extra heat for biochemical reactions

Answers

A molecule consisting of 100 amino acids has a molar mass of 10,000 amu. The answer is letter A.

The role of the enzyme is to speed up biochemical reactions. The answer is letter A. it does not take part in the reaction.

50 POINTS Match each item with the correct statement below:

1.) The fact that matter can be neither created nor destroyed in a chemical change.
2.) Substance that changes to a gas easily at room temperature.
3.) Any chemical reaction that absorbs energy.
4.) Can be observed only when there is a change in composition of a substance.
5.) Any chemical reaction that gives off energy.
6.) The amount of matter contained in a unit of volume.
7.) The type of change in which the identity of substances does not change.
8.) The change of one or more substances into other substances.
9.) Can be observed without any change in the identity of the substance.
10.) Another term for chemical change.

chemical property
physical change
physical property
chemical change
density
law of conservation of mass
chemical reaction
volatile
endothermic
exothermic
energy

Answers

Answer:

1) law of conservation of mass

2) volatile

3) endothermic

4) chemical property

5) exothermic

6) density

7) physical change

8) chemical change

9) physical property

10) chemical reaction
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