What is the answer for B?

Which element is most likely to replace hydrogen in a displacement reaction?

LUCKY_DIMON [66]

Answer: The correct option is (D) lithium (Li).

Explanation: Hydrogen is the element which belong to period 1. The atomic number of hydrogen is, 1

The electronic configuration of hydrogen is,

The number of valence electrons present in hydrogen is, 1.

(A) Helium is the element which belong to period 1. The atomic number of helium is, 2

The electronic configuration of helium is,

The number of valence electrons present in helium is, 2.

(B) Oxygen is the element which belong to period 2. The atomic number of oxygen is, 8

The electronic configuration of oxygen is,

The number of valence electrons present in oxygen is, 6.

(C) Nitrogen is the element which belong to period 2. The atomic number of nitrogen is, 7

The electronic configuration of nitrogen is,

The number of valence electrons present in nitrogen is, 5.

(D) Lithium is the element which belong to period 2. The atomic number of lithium is, 3

The electronic configuration of lithium is,

The number of valence electrons present in lithium is, 1.

From this we conclude that the lithium element has the same number of valence electrons as hydrogen.

Hence, the correct option is (D) lithium (Li).

3 0

3 years ago

Most proteins destined to enter the endoplasmic reticulum _________. Group of answer choices are transported across the membrane

Svetlanka [38]

Answer:

Begin to cross the membrane while still being synthesized-C

Explanation:

The Endoplasmic Reticulum is a part of the endomembrane system of the cell which is mostly reponsible for the synthesis and modification of proteins, although synthesis of lipids in plant and animal are carried out here

For more synthesis of proteins, it

needs to be further transported into the Rough endoplasmic reticulum- the designated site for secretion after synthesis of proteins.

Also it has been found out that when this proteins enter the Endoplasmic Reticulum, they start to cross the membrane while still being synthesized.

7 0

4 years ago

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The amount of energy needed for a reaction to take place is the activation energy enzymes can lower the activation energy of a c

White raven [17]

<span>8. Chitinase is an enzyme that breaks down the chitin molecules in an insect's exoskeleton. The sequence of amino acids in the chitinase is an example of which level of protein structure?
==> primary

9. The amount of energy needed for a reaction to take place is the activation energy. Enzymes can lower the activation energy of a chemical reaction. Which of the following describes a way that this could happen?
==> Molecules can be brought together so they will bond more easily.

10. What is one way that RNA differs from DNA?
==> It is single-stranded.

11. Which molecule do mammals use to store extra glucose in their muscles?
==> glycogen

12. Which molecule do plants use to store extra glucose?
==> starch

13. Which element is present in all amino acids, but not necessarily in fats or carbohydrates?
==> nitrogen

14. Which statement best describes the role of DNA in the body?
==> It contains genetic information.

15. Which statement best explains how enzymes speed up chemical reactions?
==> Enzymes lower the activation energy of a reaction.</span><span>
</span>

6 0

4 years ago

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Definition of metaphase one

alisha [4.7K]

The stage in mitosis or meiosis in which duplicated chromosomes line up along the equatorial plate of the spindle.

7 0

4 years ago

According to the National Institute of Health, shock happens when blood pressure drops and blood and oxygen flow decreases to yo

Zepler [3.9K]

It increases blood volume reducing the flowrate of blood

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