CHEMISTRY HIGH SCHOOL

In order to get a reaction started the reactants of this type of reaction require the greatest amount of energy:a. fusion
b. fission
c. physical
d. chemical

Answers

Answer 1
Answer: The answer is A. Fusion is a reaction type that in order to initiate the reaction a greatest amount of energy should be inputted. This reaction involves two or more atomic nuclei coming very close to each other then colliding and eventually joining to form a new nucleus. The energy needed to do this is very large.

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What is the ph of 1.2 time 10 to the negitive 2

Answers

Answer:

Explanation:

H⁺  = 1.2 x 10⁻²

pH = - log[H⁺]

= - log [ 1.2 x 10⁻²]

= - log1.2  + 2

= - .079 + 2

= 1.921 .

warm water near the equator rises towards the surface, creating a current. what would you expect to happen to this current if the temperature at the equator decreased?

Answers

IF there is a decrease in the temperature at the equator then it is possible that there is an increase in the speed of current.

True or False, A Bronsted-Lowry acid is a proton acceptor, while a Bronsted-Lowry base is a proton donor.

Answers

This statement is false. A Bronsted-Lowry acid is a proton DONOR and the Bronsted-Lowry base is a proton ACCEPTOR, Based on the Bronsted-Lowry definition, acids and bases are being classified whether they can donate or accept and proton. Bronsted-Lowry acid is a PROTON DONOR because it donates a proton to H2O and for the Bronsted-Lowry base, it basically accepts a proton from acids such as HCl. 

A solution can be both a. Dilute and concentrated
b. Saturated and dilute
c. Saturated and unsaturated
d. Supersaturated and saturated
e. None of these

Answers

D) Supersaturated and Saturated

What is the molarity of 750 ml of a solution containing 2.10 moles of Na_2SO_4?

Answers

Answer:

\huge{ \boxed{ 2.8 \: \text{M}}}

Explanation:

The molarity or concentration of Na_2SO_4 can be found by using the formula;

c = (n)/(v)

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

n is the number of moles

From the question;

n = 2.1 moles

v = 750 mL which has to be converted to litres

1000 \: ml = 1l \n \therefore \: 750 \: ml = (750)/(1000) * 1l \n = 0.75 \: l \n \n \therefore \: v = 0.75 \: l

\therefore \: c = (2.1)/(0.75) = 2.8

We have the final answer as;

2.8 M

Which statement explains why a C–O bond ismore polar than a F–O bond?
(1) At STP, carbon has a greater density than
fluorine.
(2) A carbon atom has more valence electrons
than a fluorine atom.
(3) The difference in electronegativity between
carbon and oxygen is greater than that
between fluorine and oxygen.
(4) The difference in first ionization energy
between carbon and oxygen is greater than
that between fluorine and oxygen.

Answers

Answer: (3) The difference in electronegativity between  carbon and oxygen is greater than that  between fluorine and oxygen.

Explanation: Polarity of a molecule is due to the difference in electronegativity of the atoms. More is the electronegativity difference, more is the polarity.

Electronegativity of carbon = 2.5

Electronegativity of oxygen = 3.5

Electronegativity of fluorine = 4.0

Thus the difference in electronegativity of carbon and oxygen is=(3.5-2.5)= 1.0

Thus the difference in electronegativity of fluorine and oxygen is=(4.0-3.5)= 0.5.

Thus C-O bond is more polar than F-O bond.
The correct answer is statement 3, the difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen. The most polar bond is the one with the highest difference in electronegativity values between two atoms. In this case, the C-O bond.
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