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
vovikov84 [41]
4 years ago
5

Which statement about exothermic reactions is accurate?

Chemistry
2 answers:
frosja888 [35]4 years ago
6 0

Answer:

A) As reactants form products, the potential energy decreases.

Explanation:

this is correct on ed-genuity, hope this helps! :)

ki77a [65]4 years ago
4 0

Answer is: As reactants form products, the potential energy decreases.

There are two types of reaction:

1) Endothermic reaction (chemical reaction that absorbs more energy than it releases).

2) Exothermic reaction (chemical reaction that releases more energy than it absorbs).

For example, balanced chemical reaction:  

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O  ΔrH= -1370 kJ/mol.

This reaction is exothermic reaction (heat is released), so products have less potential energy and energy is transerred to surroundings.


You might be interested in
When 2.50 g of an unknown weak acid (ha) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of
baherus [9]
When dT = Kf * molality * i
                = Kf*m*i
and when molality = (no of moles of solute) / Kg of solvent
                               = 2.5g /250g x 1 mol /85 g x1000g/kg
                               =0.1176 molal
and Kf for water = - 1.86 and dT = -0.255
by substitution 
0.255 = 1.86* 0.1176 * i
∴ i = 1.166
when the degree of dissociation formula is: when n=2 and  i = 1.166
a= i-1/n-1 = (1.166-1)/(2-1) = 0.359 by substitution by a and c(molality) in K formula
∴K = Ca^2/(1-a)
     = (0.1176 * 0.359)^2 / (1-0.359)
     = 2.8x10^-3



5 0
3 years ago
You’re beautiful *heart*
Georgia [21]
I’m not your just blind. I’m sorry
8 0
3 years ago
Each compound listed is soluble in water. For each compound, do you expect the resulting aqueous solution to conduct electrical
Strike441 [17]

Answer:

See below in bold.

Explanation:

a) Yes  because it is an ionic compound. Forms ions in water solution.

b) This is an alcohol with covalent bonds it does not ionise in water - no.

c) Yes this forms ions in water solution.

d) This is a sugar and does not ionise so No.

5 0
3 years ago
We drop a cube of ice into a glass of water. The mass of the cube of ice is 33.1 g and its initial temperature is −10.2∘C. The m
Nastasia [14]

Answer: The final temperature (T) will be;

16.23°c

Explanation: To find the final temperature of any mixture of substance with an initial temperature use the formula;

M1c(T-T1) + M2c(T-T2)=0

c is the specific heat capacity of the two different substance, but because ice and water are the same, we assume c to be 1

T= final temperature of the mixture

T1= initial temperature of the ice= -10.2°c

T2= initial temperature of the water= 19.7°c

M1= mass of ice= 33.1g

M2= mass of water= 251g

Using the formula above

33.1(T-(-10.2)) + 251(T-19.7)=0

Solving out the bracket

33.1T + 337.62 + 251T - 4944.7 = 0

Collecting like terms to both side of the equation and solving

33.1T + 251T = 4944.7 - 33.62

284.1T = 4607.08

T = 4607.08÷284.1 = 16.23°c

6 0
3 years ago
A solution of bleach has about 1.5 g of NaOCl dissolved in 220 mL of solution. What is the molarity?
ale4655 [162]

Answer:

0.091 mol/L

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),  

n = moles of solute ( unit = mol ),  

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the data of the question , it is given that ,

w = 1.5 g

V = 220 mL

Since ,

1 mL = 1/1000L

V = 0.220 L

As we known , the mass of bleach NaOCl is ,

m = 74.44 g/mol

from the above equation , moles can be calculated as -

n = w / m

n = 1.5g / 74.44 g/mol

n = 0.0201 mol

Molarity of the solution is calculated as ,

M = n / V

M = 0.0201 mol / 0.220 L

M = 0.091 mol/L

4 0
4 years ago
Other questions:
  • The number of objects in a mole is so fantastically large as to be incomprehensible from everyday experience. If a mole of ice c
    15·1 answer
  • Which statement describes how the bond between two oxygen atoms is formed?
    12·2 answers
  • Which of the following occurs when a liquid becomes a gas
    7·1 answer
  • A cell created by cloning is genetically A identical to its parent. B identical to its stem cell. C unique because it is a mixtu
    13·1 answer
  • What kind of inhibitors are transition state analogs usually classified as? uncompetitive inhibitors competitive inhibitors nonc
    7·1 answer
  • What is the average composition of the total vapor distilled and the composition of the liquid left? B. If this same vaporizatio
    10·1 answer
  • 6. The variable that a scientist changes on purpose to test a hypothesis is the
    5·1 answer
  • Do you think that there is a high correlation between proficiency in mathematics and proficiency in chemistry? Explain why or wh
    15·1 answer
  • If a light bulb is missing or broken in a series circuit will the other bulb light?
    14·2 answers
  • A 0.98 M solution of calcium chloride with a volume of 0.25 L is diluted to form a 0.74 M solution. What is the new volume of th
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!