CHEMISTRY HIGH SCHOOL

An atom of lithium 7 has an equal number of

Answers

Answer 1
Answer: Electrons and protons
Answer 2
Answer: Lithium 7 has an equal number of protons and neutrons. 

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What would happen if a decomposers were absent from the forest ecosystem?

Answers

there would be no way that the nutrients could go back into the ecosystem and there would be tons of dead animals lying around.

Match each element with the number of atoms found in one molecule of this compound: C5H7N (nicotine)

Answers

Carbon (5)
Hydrogen(7)
Nitrogen(1)

________, such as HCl(aq), produce hydrogen ions when dissolved in water. A) Arrhenius acids
B) Arrhenius bases
C) Brønsted-Lowry bases
D) Brønsted-Lowry acids

Answers

The correct answer is A. Arrhenius acids, such as HCl(aq), produce hydrogen ions when dissolved in water. According to Arrhenius, acids are compounds or ions that releases hydrogen (H+) ions in its aqueous form.

Plz help based on graph 1. what is happening to the population of the mice between days 0 and 7? suggest some possible reasons why this trend is occurring? 2. what is the approximate carrying capacity of this mouse population from observing the graph? how do you know this ? 3. the farmer who owns the barn has been given two barn cats how will this affect the size of the mouse population explain your answer 4. What are some other factors that will change the size of the mouse population in the future?

Answers

1.  The population of the mice seemed to grow until day 7.  This likely occurred do to the fact that the mice kept reproducing and they had enough resources to sustain the population growth.
2.  the carrying capacity is around 24 since that is when they reach population equilibrium.
3.  This will lower the mice population since it will introduce a predator that will lower the carrying capacity.
4.  The mice population can change in the future if more predators are introduced, if predators die out/go away, if an invasive species is introduced that competes with the mice for resources, if the climate changes, and if the amount of resources available to the mice increases or decreases.
I hope this helps. let me know in the comments if anything was unclear.

What does the atomic mass describe?a. The mass of the protons in the atom
b. The mass of the nucleus of the atom
c. The mass of the neutrons in the atom
d. The mass of the electrons in the atom

Answers

B., the mass of the nucleus of the atom.
Both the protons and the neutrons are inside the nucleus. The atomic number of an atom is the number of protons, and if you subtract the atomic number from the atomic mass you can find the number of neutrons an atom has. 
So, the mass of the protons plus the mass of the neutrons, which are both inside the nucleus, equals the atomic mass. 

A bottle of rubbing alcohol contains both 2-propanol and water. These liquids can be separated by the process of distillation because the2-propanol and water
(1) have combined chemically and retain their different boiling points
(2) have combined chemically and have the same boiling point
(3) have combined physically and retain their different boiling points
(4) have combined physically and have the same boiling point

Answers

Both 2-propanol and water can be separated by the process of distillation because the 2-propanol and water have combined physically and retain their different boiling points. Thus, the correct option for this question is C.

What is Distillation?

Distillation may be defined as a methodology through which components are separated from a mixture. It involves the process by which the components are evaporated and the vapors condensed.

2-propanol is also known as Isopropyl alcohol. The boiling point of this is 82.5°C which is lower than that of water. When both 2-propanol and water are mixed they usually get separated through the physical process known as boiling. Water typically starts boiling at 100°C.

Therefore, the correct option for this question is C.

To learn more about Boiling points, refer to the link:

brainly.com/question/40140

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The answer is (3). 2-propanol (also called isopropyl alcohol) and water are combined as a mixture, and it is therefore possible to separate them via the physical process of boiling since 2-propanol boils at a lower temperature than water does.
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