CHEMISTRY HIGH SCHOOL

Physical activity and exercise typically lead to __________.a. increased stress
b. depression
c. higher energy levels
d. reduced quality of life

Answers

Answer 1
Answer: The answer is c - physical activity and exercise typically lead to higher energy levels. The endorphins and hormones released during periods of high activity actually help to combat stress and depression linked to a depletion in serotonin, and therefore can only increase the quality of life. The other possible answers to this question are therefore all incorrect.
Answer 2
Answer:

the answer is c i just took the test

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in kilometers how much larger is the distance around the earth from east to west than the distance from north to south

Answers

The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers. It is 67.3 kilometers apart.

What is distance ?

Distance is a measurement of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.

The size or extent of the displacement between two points is referred to as distance. Keep in mind that the distance between two points and the distance traveled between them are not the same. The length of the entire journey taken to get from one point to another is the distance traveled.

Both of these numbers are quite close to the recognized modern estimates for the Earth's diameter and radius, which have since been determined by orbiting spacecraft and are 40,070 km and 6378 km, respectively.

Thus, The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers.

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24,859.73 miles  from east to west. the difference is 67.3 kilometers

Explain the valence differences etc between the two polyatomic ions: nitrate and nitrite.

Answers

Both Nitrates and Nitrites are inorganic chemical compounds, and as the names imply, the characteristic element in them is ‘N’ or Nitrogen, which has an atomic number of 7. Nitrogen is an odourless diatomic gas in nature and is reactive. The element Nitrogen is also highly electro-negative. And both Nitrates and Nitrites are two important classes of Nitrogen-containing compounds. The main difference between Nitrate and Nitrite is that Nitrate group contains one Nitrogen atom and three Oxygen atoms whereas Nitrite group contains one Nitrogen atom and two Oxyg
Both Nitrates and Nitrites are inorganic chemical compounds, and as the names imply, the characteristic element in them is ‘N’ or Nitrogen, which has an atomic number of 7.

Hope this helps.

Definition of periodic trends

Answers

Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Major periodic trends include electronegativity, ionization energy, electron affinity, atomic radii, ionic radius, metallic character, and chemical reactivity.

Final answer:

Periodic trends are patterns in the periodic table that help predict certain properties of elements. They include atomic radius, ionization energy, and metallic character, which change based on the element's position in the table.

Explanation:

Periodic trends refer to specific patterns presented in the periodic table that reflect different aspects of a certain element, including its size and electronic properties. They are instrumental to chemists as they provide a tool for quickly predicting an element's properties. These trends occur because of the similar atomic structure of the elements within their respective group families or periods, and due to the periodic nature of the elements.

Majorperiodic trendsconsist of atomic radius, ionization energy, and metallic character. As an example, ionization energy and electronegativity typically intensify from left to right in a row and from the base to the top in a column. In contrast, the atomic size and the metallic character increase from right to left in a row and from the top to the bottom in a column. The periodic table's structure allows us to qualitatively evaluate how these properties of the elements change based on their position on the table.

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A rock weighing 75.0g is placed in a graduated cylinder displacing the volume from 31.4 ml to 36.5ml. What is the density of the rock in grams /cubic centimeter.

Answers

Answer:

14.71 g/cm³

Explanation:

The density of a substance can be found by using the formula

density = (mass)/(volume) \n

volume = final volume of water - initial volume of water

volume = 36.5 - 31.4 = 5.1 mL

But

1 mL = 1 cm³

5.1 mL = 5.1 cm³

From the question we have

density = (75)/(5.1) \n = 14.705882..

We have the final answer as

14.71 g/cm³

Hope this helps you

How to balance the redox reation : H2S+O2--> H2O+SO2

Answers

2(H2S) + 3(O2) --> 2(H2O) + 2(SO2)

According to the kinetic molecular theory, whichstatement describes the particles in a sample of an
ideal gas?
A. The particles are constantly moving in circular
paths.
B. The particles collide, decreasing the total energy
of the system.
C. The particles have attractive forces between them
D. The particles are considered to have negligible
volume.

Answers

Answer:

D. The particles are considered to have negligible volume.

Explanation:

According to the Kinetic Molecular Theory for ideal gases

- Gases are composed of larges molecules which are in constant random motion in a straight line

- The volume of the gas particles is negligible compared to the total volume in which the gas is contained.

- The attractive and repulsive forces between gas molecules is insignificant ie There are no interactive forces.

- The collisions of the particles  are perfectly elastic and energy is being transferred between the particles but the total energy remaining constant
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