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SOVA2 [1]
3 years ago
6

Which of these statements is not true?question 20 options:atoms of isotopes of an element have different numbers of protons.atom

s of the same elements can have different masses.atoms are mostly empty space.the nucleus of an atom has a positive charge.save?
Chemistry
2 answers:
aniked [119]3 years ago
6 0

Atoms of isotopes of an element have different numbers of protons. i took the test

Greeley [361]3 years ago
4 0
The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom
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What types of intermolecular forces are found in CH<br> 4
Sphinxa [80]
London dispersion forces
8 0
3 years ago
Which structural feature will differ among an ester, an alcohol, and an aldehyde, regardless of which examples are being compare
AlekseyPX

Answer:

The functional group

Explanation:

A functional group defines a hydrocarbon. an ester the functional group is an O- alkyl group while that one of an alcohol is -OH group. An aldehyde is a functional group on its own.

7 0
3 years ago
Read 2 more answers
A scientist measures the standard enthalpy change for the following reaction to be 67.9 kJ:
bekas [8.4K]

Answer: The standard enthalpy of formation  of H_2O(g) is  -252.1 kJ/mol.

Explanation:

The balanced chemical reaction is,

Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)

The expression for enthalpy change is,

\Delta H=[n\times H_f_{products}]-[n\times H_f_{reactantss}]

Putting the values we get :

\Delta H=[2\times H_f{Fe}+3\times H_f{H_2O}]-[1\times H_f{Fe_2O_3}+3\times H_f{H_2}]

67.9kJ=[(2\times 0)+(3\times H_f{H_2O})]-[(1\times -824.2kJ/mol)+3\times 0kJ/mol)]

H_f{H_2O}=-252.1kJ/mol

Thus standard enthalpy of formation  of H_2O(g) is  -252.1 kJ/mol.

3 0
3 years ago
3. If the percent by volume is 2.0% and the volume of solution is 250 mL, what is the volume of solute in solution? (1 point) 0.
igor_vitrenko [27]
Volume percent = Volume of solute
                              ----------------------------------
                                Volume of the solution
  
                  2                    Volume of the solute
               -------   =           ------------------------------
                100                               250
                     
         Volume of the solute = 2 x 250
                                                ------------
                                                  100         

                                             =   5 mL.

Hope this helps!




                            




4 0
3 years ago
What is the total temperature change between 3km and 7km above earth's surface
leva [86]
4km I believe is the answer
4 0
3 years ago
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