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Zinaida [17]
2 years ago
9

Please help me answer the questions I need help

Chemistry
1 answer:
andriy [413]2 years ago
4 0

Answer:

atomic radius decreased from left to right

electrons in an atom increases

causing the atom to shrink

atom radius increased down a group

additional energy level is added

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What do chromosomes do
iVinArrow [24]

Answer:

Chromosomes help ensure that DNA is replicated and distributed appropriately during cell division.

Explanation:

4 0
3 years ago
How many moles of carbon dioxide gas should be produced when 10.0 g of C2H6 are combusted at STP?
Finger [1]

Answer:

                    0.665 moles of CO₂

Explanation:

                     The balance chemical equation for the combustion of Ethane is as follow:

                            2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Step 1: <u>Calculate moles of C₂H₆ as;</u>

                              Moles  =  Mass  /  M.Mass

Putting values,

                              Moles  =  10.0 g / 30.07 g/mol

                              Moles  =  0.3325 moles

Step 2: <u>Calculate Moles of CO₂ as;</u>

According to balance chemical equation,

                    2 moles of C₂H₆ produced  =  4 moles of CO₂

So,

             0.3325 moles of C₂H₆ will produce  =  X moles of CO₂

Solving for X,

                      X  =  0.3325 mol × 4 mol ÷ 2 mol

                      X = 0.665 moles of CO₂

3 0
3 years ago
What three tests must all theories pass to be considered a "proven" theory?
VladimirAG [237]

 In order to become a scientific theory the three categories that it must pass are the following: 


1) Can the phenomena be recreated in a laboratory setting? 


2) Can variables be changed, yet still result in like observations? 


3) Is the phenomena truly natural or was it the result of a man-made force enacting upon it?

7 0
4 years ago
How many moles are in 20 grams of Ca (Calcium)? *
liraira [26]

Answer: The correct is 0.5 moles.

Explanation:

3 0
3 years ago
A 69.1-g sample of h2o contains how many molecules of water?
8_murik_8 [283]
  The  number  of  molecules   of   water   is calculated  as  follows

find the  moles of   water=  moles=mass/molar  mass

moles  =   69.1g/18 g/mol   =  3.84  moles
by  use of  Avogadro  law constant 
that  is  1  mole =   6.02  x10^23   molecules  what   about  3.84   moles  of  water

  the  molecules  of  water  =  (3.84   x   6.02  x10^23) = 2.312  x10^24  molecules
5 0
4 years ago
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