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3 years ago

Need help read the comment below.

Chemistry

1 answer:

BartSMP [9]3 years ago

8 0

Answer:

Protective fruit

Explanation:

Angiosperm seeds grow in the middle of flower's ovaries and are covered by a defensive fruit.

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When 1.5 grams of magnesium burns, how many grams of magnesium oxide will be formed?

SashulF [63]

The balanced chemical reaction for this would be written as:

2Mg + O2 = 2MgO

We use this reaction and the amount of the reactant given to calculate for the amount of magnesium oxide that is produced. We do as follows:

1.5 g Mg (1 mol / 24.31 g) ( 2 mol MgO / 2 mol Mg ) (40.30 g /1 mol ) = 2.49 g MgO produced

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3 years ago

How does solar radiation affect the thermosphere? explain

Mashutka [201]

"The sun radiates radiation in the UV, visible and infra-red regions of the spectrum. When this reaches earth, some is reflected off the atmosphere/ clouds back into space. However, some passes through. UV radiation ionises molecules in the thermosphere, and this is the cause of the aurora." Credits to Google

Happy studying!

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3 years ago

I need HELP!!! Do the benefits of nuclear power outweigh the risks?

Georgia [21]

While there is no such thing as 100 percent safe, having nuclear energy is much safer than you think. It's thousands of times safer than conventional coal and other fossil-fuel-derived energy, not to mention the specter of environmental disaster from continued use of carbon-based energy sources.

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3 years ago

Which pair of elements have the same number of atomic orbitals?

levacccp [35]

Answer:

Sodium and strontium

Explanation:

3 0

3 years ago

Potential Energy can be calculated using PE = mgh, and Kinetic Energy can be calculated using KE = ½mv².

yKpoI14uk [10]

Answer:

hemists divide energy into two classes. Kinetic energy is energy possessed by an object in motion. The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy.

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Kinetic energy is usually measured in units of Joules (J); one Joule is equal to 1 kg m2 / s2.

Calculate the kinetic energy in Joules possessed by each of the following objects. Remember to use the correct number of significant figures in your answer.

A. A 500 g wooden block moving at 2 m/s.

J

B. A 71 kg man walking at 1.0 m/s.

J

C. A 71 kg man running at 5.0 m/s.

J

D. A 1816 kg car (2 tons) travelling at 26.8 m/s (60 mph).

J

Potential energy is energy an object has because of its position relative to some other object. When you stand at the top of a stairwell you have more potential energy than when you are at the bottom, because the earth can pull you down through the force of gravity, doing work in the process. When you are holding two magnets apart they have more potential energy than when they are close together. If you let them go, they will move toward each other, doing work in the process.

The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters. Notice that gravitational potential energy has the same units as kinetic energy, kg m2 / s2. In fact, all energy has the same units, kg m2 / s2, and is measured using the unit Joule (J).

Explanation:

5 0

3 years ago