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Murljashka [212]
3 years ago
11

Significant figures are an indicator of the certainty in measurements true or false?

Chemistry
1 answer:
IRISSAK [1]3 years ago
3 0
True. 

SF are used for simplifying figures in a measurement to produce a more accurate reading. 
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Less energy was entering Earth's
ololo11 [35]

Answer:

The temperatures on Earth increase

Explanation:

more energy results in more heat.

6 0
3 years ago
A hot air balloon is filled with 15 moles helium gas and 5 moles nitrogen gas. What is the volume of the balloon at 1.01 atm and
kvasek [131]

<u>Given:</u>

Moles of He = 15

Moles of N2 = 5

Pressure (P) = 1.01 atm

Temperature (T) = 300 K

<u>To determine:</u>

The volume (V) of the balloon

<u>Explanation:</u>

From the ideal gas law:

PV = nRT

where P = pressure of the gas

V = volume

n = number of moles of the gas

T = temperature

R = gas constant = 0.0821 L-atm/mol-K

In this case we have:-

n(total) = 15 + 5 = 20 moles

P = 1.01 atm and T = 300K

V = nRT/P = 20 moles * 0.0821 L-atm/mol-K * 300 K/1.01 atm = 487.7 L

Ans: Volume of the balloon is around 488 L


3 0
3 years ago
Which element's atomic radius increases the most in size when it becomes ionized? A. Sodium B. Chlorine C. Fluorine D. Lithium
Drupady [299]
I am thinking Chlorine
5 0
3 years ago
A sample of a substance has a mass of 7.5 g and a volume of 2.5 cubic centimeters. What is the object’s density?
Inga [223]

Answer:

option A is the correct answer .

Explanation:

as density = mass per unit volume

density = 7.5/2.5 = 3 gm / cm³ ..is the answer ...

pls mark my answer as brainlist plzzzz and plz vote

7 0
3 years ago
Read 2 more answers
What is the strongest intermolecular force
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The strongest of the intermolecular forces are hydrogen bonds
7 0
4 years ago
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