CHEMISTRY MIDDLE SCHOOL

what is the ratio of the rate of effusion of helium (atomic mass 4.00 amu) to that of oxygen gas (molecular mass 32.0 amu)?

Answers

Answer 1

Answer:

3 : 1

Explanation:

Let the rate of He be R1

Molar Mass of He (M1) = 4g/mol

Let the rate of O2 be R2

Molar Mass of O2 (M2) = 32g/mol

Recall:

R1/R2 = √(M2/M1)

R1/R2 = √(32/4)

R1/R2 = √8

R1/R2 = 3

The ratio of rate of effusion of Helium to oxygen is 3 : 1

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how do you balance the equation?

Answers

Answer:

You make each side equal to the other by muktiplying it by a number and yiu keep that number on each side. Hope this helps. :]

Explanation:

Plants don't move around, so why do they need energy?

Answers

Every organism needs the energy to carry out a number of different processes, such as growth and reproduction. The energy is necessary for different metabolic processes and reactions inside the cells. Plants do not move around, so they don't need energy for movement, but they need the energy to develop, to grow, to produce food, to reproduce, and many other processes.

Plants need energy for Reproduction, Photosynthesis, Growth, and Development amongst others.

Required Energy in Plants

To produce their own food energy, which is referred to as "photosynthesis," plants need water and sunlight. They need energy because they are living things.

Photosynthesis is the process by which plants turn solar energy into sugar. Light energy is utilized by photosynthesis to transform carbon dioxide and water.

Numerous biological functions, such as growth and reproduction, require energy. Therefore, energy is absolutely essential.

Learn more about Energy in Plants here:

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Liver cells require a great deal of energy which cell organelles would you except to appear in large number as a result

Answers

Mitochondria are the powerhouses of the cell, so mitochondria is the answer

Final answer:

Liver cells, which require a high amount of energy, contain large numbers of mitochondria, the organelles responsible for energy production in the form of ATP.

Explanation:

The cell organelles that you would expect to appear in large numbers in liver cells, which require a great deal of energy, are mitochondria. Mitochondria, often referred to as the 'powerhouses of the cell, are responsible for producing a molecule called adenosine triphosphate (ATP), which is the main source of cellular energy. Therefore, cells that require a lot of energy, like liver cells, tend to have many mitochondria in order to meet their energy demands.

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Can someone please help me in number 1 and 2 thankss

Answers

1. New moon, waxing gibbous, Full moon, and waning crescent are the main ones but there are more.

2. The revolution of the Earth is 365.25 days while the revolution of the moon is 28 days. Also, the Earth orbits the sun while the moon orbits the Earth and vaguely orbits the sun due to the orbit of the Earth.

3. Tidal waves, seasons, and the lunar cycle.

4. Moonlight is light that is reflected off the moon's surface that comes from the sun. This "lights" the moon up. Sunlight is light that comes from the sun which is made by a bunch of chemical reactions.

Good luck!

How can you tell just by looking whether a mixture in water is a solution or a suspension?

Answers

A solution is usually colourless and we do not see its constituent particles.

We can easily see constituent particles in a suspension.

Answer:

you can easily see constituent particles in a suspension

Explanation:

How can understanding change of state help you to seprate a salt water solution

Answers

Answer: You can apply the fact that water changes from liquid to gas when heated to its boiling point.

Explanation:

Salt solution contains salt dissolved in water. The water can be separated from the salt by evaporation of the solution to dryness. This exploits the fact that water changes from liquid to gas at it's boiling point. This is an example of change of state. When heated strongly, all the water present will be converted to vapour and the solid salt reappears.

Because if you wanted to separate the salt from the solution, you will have to know the boiling point of the water. Since one way is to evaporate water from salt, which means you boil the water and leave all the salt behind, you have a solid left, which is the salt. You had to know that water can be evaporated because it is a liquid.

The three states of matter are:
-Solid
-Liquid
-Gas
There is one more that doesn't appear often, Plasma

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