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erastova [34]
3 years ago
5

What does the most accurate clock tell us

Chemistry
2 answers:
Murrr4er [49]3 years ago
6 0
It tell us the most accurate time u can get out of a clock
Tom [10]3 years ago
5 0
1 second is the time that elapses during 9,192,631,770 cycles of the radiation produced by the transition between two levels of the caesium 133 atom
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In what orbital would to valence electrons of strontium be found? a.) 5s b.) 4s c.) none d.) 5p​
KonstantinChe [14]

Answer:

The correct answer is 5s

Explanation:

Strontium atomic number = 38

Electronic configuration is $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 5s^{2}

As $5s$ orbital is valence orbital in strontium, the outer electrons exists in that orbital only.

4 0
3 years ago
An air mattress is filled with 0.55 moles of air. The air inside the mattress has a temperature of 295 K and a gauge pressure of
Nitella [24]

Answer: 385.4132857

Explanation:

Using the equation, PV=nRT, you can solve this problem.

P= 3.5 kPa      V=?    n= 0.55 moles of air     T= 295K    R= 8.314 (L kPa/mol K)

We use the constant rate of <u>8.314</u> because we are using kilopascals in this problem.

Using simple algebra we get-

V = (0.55 moles)(8.314 L kPa/mol k)(295 K) / 3.5 kPa

Using the calculator, we would get the answer of 385.4132857 L.

And whatever the significant figure is asked for, for example, 3 significant figures: the answer would be 385 liters.

3 0
3 years ago
What do helium (He), neon (Ne), and argon (Ar) have in common?
IrinaK [193]

Answer:

The answer is: D

Explanation:

A. They have the same number of electron energy shells.  Is false, all the elements are in different periods so, they have different number of lectron energy shells.

B. They are all Halogens.  No, is wrong, halogens are F, Cl ,Br

C. They have the same number of electrons.  is wrong, if they had the same number of electrons they must be they same element and they aren't the same.

D. They are all Noble gases. Yes, it's true they are noble gases, they are the first group in the periodic table from the right.

6 0
3 years ago
Read 2 more answers
Which is TRUE of the products in this combustion reaction? 4Fe + 3O2 2Fe2O3
ycow [4]
The only true answer is A. 

products are on the right side of the reaction

products and reactants don't necessarily have same physical or chemical properties

It is the reactants that <span>are the atoms, molecules, or compounds that participate in the reaction.</span>
7 0
3 years ago
Read 2 more answers
How many element are there on the periodic table?
givi [52]

Answer:118

Explanation: it’s right

5 0
2 years ago
Read 2 more answers
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