CHEMISTRY HIGH SCHOOL

What is true of valence electrons?a) They exist in the outer orbital.

b) they easily move from one orbital to another

c) they have difficulty moving from one orbital to another

d) they are always the lowest energy electrons of the atom

Answers

Answer 1

Answer:

Answer:

They exist in the outter orbital

Explanation:

Answer 2

Answer: i think c may be your anwser but im not too sure :/ srry if u get it wrong!

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The relatively high boiling point of water is due to water havingA) hydrogen bondingB) metallic bondingC) nonpolar covalent bondingD) strong ionic bonding
Does acid precipitation in forests affect the reproduction rate in birds?
How many moles of CO2 are produced from the combustion of 6.40 mol c2h8?
Ventifacts are created by a process of erosion called A. deflation. B. flow. C. abrasion. D. creep.
Nitrogen oxides and sulfur oxides make _____.

When fossil fuels are burned, _____ is released into the atmosphere.A. oxygen
B. nitrogen
C. ammonia
D. carbon dioxide

Answers

Carbon dioxide. This is because when fossil fuels are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). These reactions release heat that we use for energy. For example, for the same amount of energy produced, burning natural gas produces about half of the amount of CO2 produced by burning coal.

Final answer:

The burning of fossil fuels primarily releases carbon dioxide into the atmosphere, contributing to greenhouse gas emissions and global warming.

Explanation:

When fossil fuels are burned, carbon dioxide (CO₂) is predominantly released into the atmosphere. Fossil fuels, such as coal, oil, and natural gas, are composed mainly of carbon. During combustion, this carbon combines with oxygen in the air to form carbon dioxide. This process is a significant source of greenhouse gases, contributing heavily to global warming. It's important to note that other substances like water vapor and minor amounts of sulfur oxides can also be produced in this reaction, but the main product is carbon dioxide.

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Mr. Smith wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered 2 groups of the same species of plants, gave them the same amount of water, and did the test for the same amount of time. On one group of plants he used white light. For the second group he changed the light color to red.

Answers

Final answer:

The color of light affects plants' growth and leaf production due to the role of different light colors in photosynthesis and the phytochrome system in plants. Chlorophyll mainly absorbs red and blue light from the light spectrum for photosynthesis, and far-red light can slow plant growth. Therefore, exposure to different light colors could result in different numbers of leaves.

Explanation:

The subject of the question is how the color of light affects the growth of plants, specifically the number of leaves plants produce. This experiment is primarily about the effect of light on plant's photosynthesis, a process that uses light to convert carbon dioxide and water into glucose. The glucose is utilized to fulfill various energy requirements of the plant's growth, including the growth of leaves.

Light has diverse wavelengths, with each color representing a different wavelength. While white light contains all the possible color wavelengths, the red light specifically contains a higher wavelength region. According to Sir Isaac Newton's experiment, sunlight, which looks white to us, contains all the colors of the spectrum.

In this context, the phytochrome system in plants plays a crucial role. Chlorophyll, the green pigment in leaves, absorbs mainly red and blue light from the light spectrum and uses that energy for photosynthesis. However, far-red light, which is one element of white light, is not absorbed. If a plant is exposed more to far-red light, it could slow its growth.

Consequently, the difference in the number of leaves that Mr.Smith observed in the plants under white light and those under red light might be due to the role of light color in photosynthesis and the phytochrome system in plants.

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In the gaseous state, chlorine exists as a diatomic molecule Cl2 (Molar mass = 70.9 g/mol). Calculate the number of moles of chlorine present in 140 g of chlorine gas. Express the quantity in moles to three significant figures.

Answers

Considering the definition of molar mass, the number of moles of chlorine present in 140 grams of chlorine gas is 1.975 moles.

Definition of molar mass

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

Number of moles present in 140 g of Cl₂

Next, you can apply the following rule of three: If by definition of molar mass 70.9 grams are contained in 1 mole of Cl₂, 140 grams of the gas are contained in how many moles?

$amount of moles=(140 grams x 1 mole)/(70.9 grams)$