1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aleksandr82 [10.1K]
3 years ago
10

Which one is a true statement about exothermic reactions?

Chemistry
1 answer:
Ugo [173]3 years ago
6 0

the answer is c, more heat is being released.

You might be interested in
Suppose you need to prepare 141.9 mL of a 0.223 M aqueous solution of NaCl. What mass of NaCl do you need to use to make the sol
Afina-wow [57]

Answer:

1.811 g

Explanation:

The computation of the mass need to use to make the solution is shown below:

We know that molarity is

Molarity = \frac{Number\ of\ moles}{Volume\ in\ L}

So,

Number\ of\ moles = Molarity\ \times Volume\ in\ L

= 0.223\times 0.141

= 0.031 moles

Now

Mass = moles \times Molecualr\ weight

where,

The Molecular weight of NaCl is 58.44 g/mole

And, the moles are  0.031 moles

So, the mass of NaCL is

= 0.031 \times 58.44

= 1.811 g

We simply applied the above formulas

3 0
3 years ago
Conner is testing the pH of a swimming pool and he finds it to be 6.5. The optimal pH for swimming is between 7.7 and 7.6. Conne
miv72 [106K]

Answer:

B.) He added a base to raise the PH

Explanation:

Took test

6 0
2 years ago
What does the energy hill represent on an energy diagram?
Butoxors [25]

Answer:

The correct answer is option D.

Explanation:

When a chemical reaction proceeds the reactants are converted into products. The energy hill represents the potential energy of the reaction.

There are two conditions: If the reaction is endothermic than the energy of the products is greater than the energy of the reactants and  ΔH  is positive. This energy gain is shown in the form of a peak.  In an exothermic reaction, the energy of the products is lower than the reactants and  ΔH  is negative.

So the suitable option is D which states that the reaction is endothermic and the potential energy gained by the products is higher when a reaction proceeds.

6 0
3 years ago
18-19. If a sample for spectrophotometric analysis is placed in a 10-cm cell, the absorbance will be 10 times greater than the a
miss Akunina [59]

Answer:

As long as it is a blank solution of the reagent, the Absorbance will be 0 regardless of the path length.

Explanation:

Absorbance of light by a reagent of concentration c, is given as

A = εcl

A = Absorbance

ε = molar absorptivity

c = concentration of reagent.

l = length of light path or length of the solution the light passes through.

So, if all.other factors are held constant, If a sample for spectrophotometric analysis is placed in a 10-cm cell, the absorbance will be 10 times greater than the absorbance in a 1-cm cell.

But the reagent blank solution is called a blank solution because it lacks the given reagent. A blank solution does not contain detectable amounts of the reagent under consideration. That is, the concentration of reagent in the blank solution is 0.

Hence, the Absorbance is subsequently 0. And increasing or decreasing the path length of light will not change anything. As long as it is a blank solution of the reagent, the Absorbance will be 0 regardless of the path length.

Hope this Helps!!!

5 0
3 years ago
A person is just as likely to become dehydrated in the cold as in the heat
kicyunya [14]
Yes this is true as in cold conditions our body doesn't feel the urge of water therefore we may become dehydrated not even knowing about it and of course in hot coditions we sweat therefore we loose water.
Hope this helps :).
8 0
3 years ago
Read 2 more answers
Other questions:
  • What is the relationship between the improved microscopes and the discoveries made about cells?
    14·1 answer
  • Which choice lists the correct order of the coefficients of each substance in the following neutralization reaction when the equ
    12·1 answer
  • Two methanol-water mixtures are contained in separate tanks. The first mixture contains 40.0 wt% methanol and the second contain
    14·1 answer
  • Calcium fluoride (CaF2) has a solubility constant of 3.45 x 10-11
    9·1 answer
  • Sodium sulfate is slowly added to a solution containing 0.0500 M Ca 2 + ( aq ) and 0.0300 M Ag + ( aq ) . What will be the conce
    7·1 answer
  • H2SO4 is a strong acid, but HSO4- is a weak acid
    8·2 answers
  • When an object such a a stone is dropped into water, it disturbs the surface of the water. Waves form at the surface of the wate
    12·1 answer
  • Maria walked on a beach made mostly of sand. She walked barefoot
    7·1 answer
  • Choose the word that correctly completes the analogy.
    5·1 answer
  • 2. Circle all of the following that change with the temperature of a reaction.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!