The term biodiversity means the variety of organism (true or false)

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Answer 1

Answer:

Answer:

true

Explanation:

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1. Eleanor weights 300 N. She walks up a small hill which is 5 meters high. It takes her 4 seconds. How much work did Eleanor do when she climbed the hill? (3 points)Hint: What is the equation used to calculate work? Does time affect the amount of work completed?

How does calcium and potassium react differently with water and why

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calcium with water:
When a metal reacts with water( cold water or hot water) then the products formed are metal hydroxide and hydrogen gas.

Metal + steam --------> Metal hydroxide + Hydrogen

Calcium reacts with cold water to form calcium hydroxide and hydrogen gas:

potassium with water.

Potassium reacts violently with cold water to form potassium hydroxide and hydrogen gas:

2K(s)+ 2H2O(l) --------> 2KOH(aq) + H2(g) + heat.
In this reaction so much heat is produced get hydrogen gas formed catches fire and burns explosively.

What is the maximum amount of p4 that can be produced from 1.0 kg of phosphorite?

Answers

Answer and explanation;

-Phosphorous can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4)2 + 6SiO2 + 10C -----> 6CaSi03 + P4 + 10CO

Phosphorite is a mineral that contains Ca3(PO4)2 plus other non phosphorous containing compounds.

-If the phosphorite sample is 75% Ca3(PO4)2 by mass, then;

mass of Ca3(PO4)2 is given by; 0.75 * (1000 g) = 750g

MM Ca3(PO4)2 = 310.19 g/mol

thus, Number of moles of Ca3(PO4)2;

= 750g / 310.19 g/mol

= 2.42 moles of Ca3(PO4)2 From the equation;

(2 mol Ca3(PO4)2 = 1 mol P4) Thus; moles of P4 will be;

=2.42 mol Ca3(PO4)2 * (1 mol P4 / 2 mol Ca3(PO4)2)

= 1.21 moles of P4 Mass of P4 will be;

=1.21 mol P4 * ( 4 x 30.974) g/mol

= 1.21 mol P4 * 123.896 g/mol

= 150 g P4. (2 sf)

Hence;

1.5 x10^(2) g P4 are produced from 1.0 kg Phosphorite mineral containing 75% Ca3(PO4)2.

Classify the following change as physical or chemical: A match lights when struck.A. Physical change
B. Chemical change

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I think the answer is:
B. Chemical Change.

A gas is initially at a pressure of 225 kPa and a temperature of 245 K in a container that is 4.5 L. If the gas is compressed to a volume of 2.1 L and the temperature changes to 275 K, what is the new pressure?

Answers

Use the ideal gas equation PV=nRT. You can compare before and after using P1V1/n1T1=P2V2/n2T2. Since the number of moles remains constant you can disregard moles from the equation and use pressure, volume and temp. Make sure your pressure is converted to atmospheres, your volume is in liters, and your temperature is in kelvins.

If the nucleus was the size of a tennis ball the atom would be the size of....?

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If the nucleus was the size of a tennis ball, the atom would be the size of a sphere about 1,450 feet in diameter.

The size of one atom would be comparable to one of the world's largest sports stadiums if the nucleus were the size of a tennis ball, or around 1,450 feet in circumference.

There are protons, neutrons, and electrons, three types of subatomic particles. Protons and electrons, two of the subatomic particles, each carry an electrical charge of one or the other.

Electrically charged protons and electrically neutral neutrons make up atomic nuclei. The strongest basic force known to science, often known as the strong force, holds these things together.

Learn more about atom, here:

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If you could find anything just bigger than a tennis ball, you're all good, because the nucleus is almost half the size of the atom, I think! U should find this helpful, if you do, great, I'm glad that I ciyld help

Asbestos is commonly found in buildings and structures built before what year?

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Asbestos is commonly found in buildings and structures built before the year 2000. This is because it was around this time that it was discovered that inhaling asbestos particles can lead to very serious diseases. It is a material found in many parts of a building or any infrastructure. A total ban of the material was implemented in 2000.

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