CHEMISTRY HIGH SCHOOL

If there is 8 g of a substance before a physical change, how much will there be afterwards?

Answers

Answer 1
Answer: 8 grams because physical changes dont involve a change in the substance's components, so the matter can not be destroyed, onlt changed.
Answer 2
Answer:

Answer:

8 g

I took the quiz and because the amount doesn’t change

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Which sample of HCl(aq) contains the greatest number of moles of solute particles?(1) 1.0 L of 2.0 M HCl(aq)(2) 2.0 L of 2.0 M HCl(aq)(3) 3.0 L of 0.50 M HCl(aq)(4) 4.0 L of 0.50 M HCl(aq)
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The liquid-vapor equilibrium of a substance can be disturbed by cooling the substance.TRUE

FALSE

Answers

The statement "The liquid-vapor equilibrium of a substance can be disturbed by cooling the substance" is false. The substance must be heated in order to get the vapor phase of that substance.

Find the number of moles of argon in 452 g of argon

Answers

no. of moles = given mass/atomic mass

= 452/40

= 11.3.

Thus, there are 11.3 moles
nó of moles =given mass/molar mass
no of moles=452/39.9
therefore no of moles=11.3moles

15 The electronegativity difference between the atoms in a molecule of HCl can be used to determine(1) the entropy of the atoms(2) the atomic number of the atoms
(3) the first ionization energy of the atoms
(4) the polarity of the bond between the two atoms

Answers

Answer : The correct option is, (4)

Explanation :

  • Electronegativity : It is a chemical property which measures the ability of an atom to attract an electrons towards itself.
  • Electronegativity difference : The difference in the electronegativity of the two atoms determines their polarity.

If the electronegativity difference between the two atoms is zero then the molecule is non-polar.

If the electronegativity difference between the two atoms is non-zero then the molecule is polar.

Therefore, the electronegativity difference between the atoms in a molecule of HCl can be used to determine the polarity of the bond between the two atoms


(4) the polarity of the bond between the two atoms

The more important the difference in electronegativity is, the more polarized the bond is.

A car with constant speed travelso 150 km in 7200 seconds what is the speed of the car

Answers

7200sec÷60sec in a minute÷60minutes in an hour=2hours. 150km÷ 2 hours= 75 km/hour

Which of the following cannot pass across the placenta?(a) oxygen
(b) waste materials
(c) blood
(d) nutrients

Answers

The placenta is the structure that allows for transfer of wastes, oxygen, and
nutrients between the mother and the fetus.  The fetal blood comes extremely
close to the maternal blood in the placenta, but there is no intermingling of fetal
and maternal blood.  The fetus and mother can even have, and often do have,
different blood types.
Oxygen cannot pass through the placenta

Drawing a conclusion derived from knowledge of an established principle is called deductive reasoning.True or false?

Answers

Answer: TRUE

Explanation:

Deductive reasoning is a process in which a conclusion is drawn on the basis of similarities and concordance with pre- proposed principles and multiple premises which are expected and assumed to be true.

In simple words the deductive reasoning is based upon conclusion which is derived from one or more statements or principles which are expected to be true.

On the basis of the above explanation, the statement Drawing a conclusion derived from knowledge of an established principle is called deductive reasoning. is true.

That would be correct.
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