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Svetradugi [14.3K]
3 years ago
8

Why is it important to start at the zero mark of a ruler/meterstick + triple beam balance when making measurements?

Chemistry
1 answer:
sergeinik [125]3 years ago
3 0
Because if you start at one for example you starting at a extra cm/m/mm. So when you get your measurement result it will be wrong by just one cm/m/mm. Hope this wasn't too confusing.
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1. What pressure would be exerted by 46.0grams of hydrogen gas placed into a 3.00 L container at
dlinn [17]

Answer:

187.34 atm

Explanation:

From the question,

PV = nRT.................. Equation 1

Where P = Pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.

make P the subject of the equation

P = nRT/V.............. Equation 2

n = mass(m)/molar mass(m')

n = m/m'............... Equation 3

Substitute equation 3 into equation 2

P = (m/m')RT/V............ Equation 4

Given: m = 46 g, T = 25°C = (25+273) = 298 K, V = 3.00 L

Constant: m' = 2 g/mol, R = 0.082 atmL/K.mol

Substitute these values into equation 4

P = (46/2)(0.082×298)/3

P = (23×0.082×298)/3

P = 187.34 atm

3 0
3 years ago
Which part of the crust is the thickest
Sergio039 [100]

Answer:

I'll take a gander at your question

Explanation:

If you mean the Earth's crust, your answer is The Mantle.

5 0
3 years ago
What is the difference between an exergonic reaction and an endergonic reaction?
Marina CMI [18]

The difference between an exergonic reaction and an endergonic reaction is that an exergonic reaction involves release of energy, while an endergonic reaction involves absorption of energy.

 

<span>In an </span>exergonic reaction, energy is released to the surroundings. The bonds being formed are stronger than the bonds being broken. In an endergonic reaction, energy is absorbed from the surroundings.

 

The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

7 0
3 years ago
Read 2 more answers
What orbital type is being filled throughout the transition metal B Groups?
Nataliya [291]

Answer:

The correct answer is: d-orbital

Explanation:

The transition metals are the chemical elements that belong to the B-group of the periodic table, from group 1B to 8B. The B-group is located between the groups IIA and IIIA in the periodic table.

The general electronic configuration of the chemical elements belonging to this group is (n-1) d¹⁻¹⁰ ns⁰⁻², because of the <u>partially filled d-subshell</u> in the ground state or excited state. <u>Therefore, the transition metals are refereed as the </u><u>d-block elements</u><u>.</u>

8 0
3 years ago
What mass of ethanol (C2H5OH(ℓ)) must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298
vlada-n [284]

Answer:

16.84 g

Explanation:

Assuming that the ethanol is free of water

the number of moles of ethanol to generate 500 KJ = 500 / 1368 = 0.3655 mol

molar mass of ethanol = 46.07 g/mol

mass of ethanol needed = 46.07 × 0.3655 = 16.84 g

5 0
3 years ago
Read 2 more answers
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