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guapka [62]
3 years ago
14

You cannot round a number if it has a decimal point true or false

Chemistry
1 answer:
Katyanochek1 [597]3 years ago
5 0
The answer is false. u can still round if # is a decimal
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if a girl holds a ball at waist level and then lifts the ball above her head and holds it there which of the following is she do
Zigmanuir [339]

Answer:

She is making kinetic energy when she lifts the ball and when the ball is above her head the ball gains potential energy.

4 0
3 years ago
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When water H2O freezes into ice some of the properties have changed but the blank of the H2O is the same.
quester [9]
I would see chemical constitution and physical components are not changed. 

Because physical reaction won't change the component itself
6 0
3 years ago
Find the enthalpy change per mole of sodium when sodium reacts with water. 13 grams of sodium reacts with 247 cm3 of water, prod
Ierofanga [76]

The answer is

-79 kJ/mol

The explanation:

The reaction equation is:

2Na + 2H2O  2NaOH + H2

when ΔHrxn= -q

and q=cmΔT

where:

-q is amount of heat absorbed/released

-and c is specific heat of solution (in such calculation an assumption is made that c solution =   c water)        

- and m is mass of solution

- and ΔT is temperature change

1- now we need to Find mass of solution:

m solution = m(H2O)+ m(Na)-m(H2)m(H2O)

m H2O= V(H2O)*ρ(H2O)

             = 247 cm3*1g/cm3 = 247 gm

and m(Na)= 13 g

2- now we need to Find m(H2):

n(Na)(moles Na)= mass/Molar mass = 13g/23 g/mol = 0.57 mol.

According to equation mole ratio n(Na):n(H2)= 2:1,

then n(H2)=n(Na)/2

                =0.57/2=0.29 mol.

∴m(H2)= moles * molar mass

          =0.29 mol *2g/mol

          = 0.58 g

∴m solution= 247 g + 13 g – 0.58 g = 259.42 g

and when q=4.18 J/K g* 259.42 g *(339.7 K – 298 K)= 45218 J

The temperature of solution increased because heat was absorbed by the solution (q>0).

Then ΔHrxn= -q = -45218 J per 0.57 mol of Na

3- now we need to Find ΔHrxn per 1 mole of Na

ΔHrxn = -45218J/0.57 mol = -79331 J/mol ≈ -79 kJ/mol

4 0
3 years ago
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Which of the following is not a possible effect of increasing carbon dioxide levels in the atmosphere? a. increase in water cont
nikitadnepr [17]

Answer:

D. reducation of cold-related deaths

Explanation:

CO2 had nothing to do with coldness.

- CO2 would increase water pollution, ocean acidification, and logging therefore D. is the only answer that would fit.

5 0
3 years ago
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Can anyone do these? or even just help .. It is urgent and I've put up all of my points. I've been able to complete everything e
Lorico [155]
A3B2
bond is ionic 
A is in group 2 (you can pick any like Ca)
B is in group 5 (like B)
the other question:
the reason is they are neutral gas and they already have 8 electrons except for He which is 2 and are completely stable so don't want to loose any electron vs Li and Na which have only 1 electron in the outer layer and are willing to loose that one to become stable. 


7 0
3 years ago
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