CHEMISTRY HIGH SCHOOL

He decayed organic material that gives soil its dark brown or black color is calledA) clay.
B) humus.
C) loam.
Eliminate
D) silt.

Answers

Answer 1
Answer: B) Humus is the decayed organic material that gives soil its dark brown or black color. 
Answer 2
Answer:

Answer:

Answer is Humus

Explanation:

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Why is calcium harder than potassium?

Answers

Because calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. Each calcium atom will be closer to the delocalized electrons. Thus, the bonds in calcium will be stronger than that in potassium.

Which of these is a chemical property of iron? A.
It is dense.
B.
It has a melting point.
C.
It is hard to bend.
D.
It becomes rusted.

Answers

Iron becomes rusted especially in damp air but never in a dry air,  this is one of the many unique characteristics of iron. Iron is also ductile and malleable. It is found in the seventh group of the periodic table. It has four different and unique crystalline forms and completely dissolves in dilute acids. The two chemical compounds that can be found or made from iron are the bivalent iron also known as ferrous and the trivalent iron or known as ferric compounds.

the answer is d.it becomes rusted

if you are finding the value of a 10 g piece of metal that has a value of 5 dollars/ 1 gram what would be my final unit

Answers

5/1 = 10/x

5x = 10
--- -----
5. 5

X = 2 dollars

A balloon, whose volume at 23°C is 535 mL, is heated to 46°C. Assuming the pressure and amount of gas remain constant, what is the volume of the balloon at 46°C?

Answers

1.    To solve this we assumethat the gas inside the balloon is an ideal gas. Then, we can use the ideal gasequation which is expressed as PV = nRT. At a constant pressure and number ofmoles of the gas the ratio T/V is equal to some constant. At another set ofcondition of temperature, the constant is still the same. Calculations are asfollows:

T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 = 296.15 x 535 / 319.15

V2 = 496.44 mL

David kept 100 grams of radioactive sodium in a container. He observed the amount of sodium left in the container after regular intervals of time and recorded them in the table shown below.Time (hours) Amount of sodium in container (in grams)
0 100
15 50
30 25
45 12.5

Based on the observations, which of these is most likely David's inference?
A.The half life period of radioactive sodium is 15 hours.
B.The half life period of radioactive sodium is 50 hours.
C.The amount of sodium left in the container after 60 hours will be 10.5 grams.
D.The amount of sodium left in the container after 60 hours will be 1.5 grams.

Answers

First we have to understand what a half life is. A half life is a measure of time when the amount of a certain object is 50% of the original amount. Hence the answer for this is letter A. The initial amount is 100. fifty percent of 100 is 50 and that happens after 15 hours. Hence, 15 hours is the half life period. 

Answer: A. The half life period of radioactive sodium is 15 hours.

Explanation:

Half life is the time taken by a reactant to reduce to its original concentration. It is designated by the symbol t_(1)/(2).

Given:

At 0 hours the amount of sodium in container is 100 grams

After 15 hours , the amount of sodium in container is 50 grams which is half of the original amount of 100 grams.

It will take 15 hours for half of a 100 g sample to decay to half of the amount i.e. 50 grams.

How long does it take vegetable oil to heat up to 350 degrees Fahrenheit

Answers

it takes about to 5 - 17 to heat up to 350 degrees Farenheit. depends on how much vegetable oil and heat.
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