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Natalka [10]
4 years ago
8

Express the results of this calculation to the correct number of significant figures: 1.02 - 0.0421

Chemistry
1 answer:
tatuchka [14]4 years ago
5 0

3s.f as that's what the numbers in the question are given to

So the answer is 0.978

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Dr. Murrays science class recently read about an experiment that had surprising results. The decided to perform the experiment i
kow [346]

The question is incomplete, the complete question is;

Dr. Murray's science class recently read about an experiment that had surprising results. They decided to perform the experiment in their class, but they used more advanced methods. Their results

must be completely different, but they are more reliable.

could be the same as before, or they could be completely different.

must be the same as the recorded results, but they are more reliable.

could be the same as the recorded results, or they must be inconclusive.

Answer:

could be the same as before, or they could be completely different.

Explanation:

Now we know that in carrying out a scientific research, there is such a thing as replication.

Replication means that other scientists in other places carry out the same experiments previously done and expect to obtain the same results as the first time the experiment was done.

However, this is not a case of replication because a different and more advanced method was used in the experiment. Once the methodology of the experiment has been changed, then the results could be the same or different. Hence the answer above.

4 0
3 years ago
How many grams of CO2 are in 8 mol of the compound?
Wittaler [7]
If you look at the periodic table, underneath each element it give you the atomic mass, which has the units g/mol.  So CO2 have a molecular mass (MM) of those combined atomic masses.  

The MM for CO2 would be...
12.01 g/mol + 2(16.00 g/mol) = 44.01 g/mol

This can be used as a conversion to change from moles to grams.

8 mol * (44.01 g / 1 mol) = 352.08 g or 6 x 10 to the 2 g for the significant figures (sig figs) at are shown in your problem.  

You may have just typed 8 instead of 8.0 or 8.00 which would change your sig figs.  It is all important to right now all your zeros, since almost all chemistry calculations involve significant figures.

I solved the above equation using dimensional analysis and had to cancel out the units, in case this is your first chemistry class.

I hope I helped!
5 0
3 years ago
If you add two protons to a nitrogen atom what would happen to it ?
likoan [24]

Answer:

This happens when there are too many protons in the nucleus, because the positive protons repel each other. When two protons fuse together, one of them decays into a neutron. Our new nucleus now has one proton and one neutron. PLEASE MARK AS BREINLEST.

8 0
3 years ago
02.01]In the 1800s, John Dalton's atomic theory was that atoms are indivisible. Later, subatomic particles such as neutrons, ele
Luda [366]
The last one is the correct answer. The atomic structure can be broken down which is what the findings concerning protons, electrons and neutrons showed. The theory was thus modified. What remained was no chemical reaction could affect the basic structure of an atom.

Still the last choice is still true. The first choice is your second best answer because of what I wrote in the last sentence of the above paragraph. 

Last Choice <<<<< answer
8 0
3 years ago
Read 2 more answers
How is density different from weight and mass?
defon

Hello there!

How is density different from weight and mass you say? It's simple!

1. Unlike weight, density is composed of mass and volume.

2. By dividing the mass over the volume, you can determine an object's density, while weight is the product of mass and gravity.

Hope this helps :) if so, can I get Brainliest?

5 0
1 year ago
Read 2 more answers
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