CHEMISTRY HIGH SCHOOL

A solution is considered neutral if its pH is _________ 7.a. equal to
b. less than
c. greater than

Answers

Answer 1

Answer: When the solution has a ph equal to 7

Answer 2

Answer:

Answer:

a, equal to

Explanation:

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Calculate the mass of 139 cm^3 Argon at STP

Answers

Volume in liters:

139 cm³ / 1000 = 0.139 L

molar mass Argon = 39.95 g/mol

1 mole -------- 22.4 L ( at STP )
? mole ------- 0.139 L

moles of argon :

0.139 * 1 / 22.4 = 0.00620 moles

Mass of argon :

0.00620 * 39.95 = 0.24769 g

hope this helps!

The availability of phosphorus is different that that of carbon and nitrogen because it is found mostly in the ____. atmosphere hydrosphere lithosphere biosphere

Answers

Answer : Option C) Lithosphere.

Explanation : Lithosphere is a layer which includes the crust and the uppermost mantle, which constitutes the hard and rigid outer layer of the Earth. The lithosphere is subdivided into tectonic plates. In these tectonic plates large amount of phosphorus is found. Whereas carbon and nitrogen in found in atmosphere not in the layers of the earth.

The availability of phosphorus is different that that of carbon and nitrogen because it is found mostly in the Lithosphere, whereas, carbon and nitrogen are found in atmosphere.

The availability of phosphorus is different than that of carbon and nitrogen because it is found mostly in the lithosphere. Lithosphere is the rigid, outermost crust on the Earth.

Tobacco's main ingredient is nicotine,alcohol,tar,cigarettes?

Answers

The correct answer is nicotine. It is the main ingredient in a tobacco. Nicotine is an addictive substance thus overuse of the substance will lead to addiction. It acts as a stimulant and a depressant. Tobacco can be dried for smoking and can also be consumed directly.

they are correct, because i had gotten it correct on my test but they are also correct because what they have shown for proof is correct. I had to do research about this in the past, everything they say is 100% correct, and trustworthy.

Hence, the correct answer is nicotine.

what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

Answer:
M = No.of moles of solute / Volume of solution in litres
HBr: H = 1 x 1 = 1 Br = 1 x 80
Molar mass : 81 g / mol
a. n = 27.7% / 100 =0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml ; D= m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L


c. M= n / V
= 0.0034 mol / 0.065 L
M= 0.052 mol / L

The molarity of the concentrated HBr solution is 0.052 mol/L

Why check dams can increase the groundwaater level in a region

Answers

Check dams shouldn't be more than 2-3 feet high. The center of it should be at least six inches lower than the edges. They might kill grass linings in channels if water stays high or sediment load is great. That criteria induces a weir effect, which makes water surface levels go upstream for some, if not all flow conditions.
Hope this helps! :)

HELP ME PLEASE ILL GIVE EC AND BRAINLESTPhotosynthesisMatter and Energy
Claim-Evidence-Reasoning
Name:
Date:
Scenario
Below is the equation of photosynthesis. Photosynthesis is a process that takes place in plants.
Notice that CO, and water are converted into sugar and oxygen.
External Data
600,
6 H,0
Water
light Cº,
+
602
+
Oxygen
ton Dede
Sugar
Prompt:
When you go home Dnight, your mother asks you to explain to her what happens during the
process of photosynthesis. Your mother is a science teacher, so make sure you use scientific terms
to give her a scienífic explanation of how energy is stored as sugar in plants through
photosynthesis.
I
Claim:
Evidence:
Reasoning:
Rebuttal: