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3 years ago

2. Can the "facts” of science change over time? If so, how

Chemistry

2 answers:

crimeas [40]3 years ago

6 0

Answer:

Yes

Explanation:

Some scientific facts are still under investigation of why it is true or not;i.e, science made us to believe that human evolution first started in the Sahara of East Africa which we don't know if it's true or not, but that's what the scientists said. And as of present days the new generations of scientists are still trying to testify if the facts are true, so it might change once their researches proved another facts differ from what we were taught.

Aleks [24]3 years ago

3 0

Definitely, the more you research into something the more information on it you’ll get, they could very well realize that with the new information their old faces were incorrect

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H is a chemical _____ and H2 is a chemical ______

jeyben [28]

I don’t know if I am right but I think it is symbol for the first one and the second one is formula.

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3 years ago

Read 2 more answers

0.785 moles of N2,fill a balloon at 1.5 atm and 301 K.<br> What is the volume of the balloon?

Tcecarenko [31]

Answer:

V = 12.93 L

Explanation:

Given data:

Number of moles = 0.785 mol

Pressure of balloon = 1.5 atm

Temperature = 301 K

Volume of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will put the values.

V = nRT/P

V = 0.785 mol × 0.0821 atm.L/ mol.K × 301 K / 1.5 atm

V = 19.4 L /1.5

V = 12.93 L

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3 years ago

How many molecules of SrCrO4 are in a sample of SrCrO4 0.556 moles?

Amiraneli [1.4K]

Answer:

$3.35*10^{23}\ SrCrO_4\ molecules$

Explanation:

$We\ are\ given\ that,\\No.\ of\ moles\ of\ SrCrO_4=0.556\\Hence,\\As\ we\ know\ that,\\No.\ of\ particles=Avagadro's\ Constant*No.\ of\ moles\\We\ already\ know\ that\ Avagadro's\ Constant=6.022*10^{23}\\Here,\\No.\ of\ SrCrO_4\ molecules= 6.022*10^{23}*0.556\\Hence,\\No.\ of\ SrCrO_4\ molecules=3.348*10^{23} molecules\ \approx 3.35*10^{23}\ SrCrO_4\ molecules$

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3 years ago

What will be the volume of a gas sample at 358 K if its volume at 255 K is 7.4 L?

Jobisdone [24]

Answer:

10.4 L

Explanation:

V1/T1=V2/T2

V2= (V1*T2)/T1

V2= (7.4L * 358K)/255K

V2=10.4 L

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3 years ago

Use the portion of the periodic table shown below to answer the questions

leva [86]

Answer:

Part 1:sodium

rubidium

Part 2: protons neutrons and electrons are all 12

The number of protons is equal to the no. of neutrons from the electronic arrangement of magnesium and the no. of electrons is got from the atomic no. of magnesium

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2 years ago