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
svp [43]
3 years ago
14

What are some signs that a chemical change takes place when a firework explodes? Matter is destroyed Light is produced Heat is p

roduced The chemical composition is not changed
Chemistry
1 answer:
Radda [10]3 years ago
4 0
Well, the answer relies on all four factors, I mean on all options. So, the answer is A, B, C, and D.
You might be interested in
2.
Dmitry_Shevchenko [17]

Answer:

Atomic number

Explanation:

6 0
3 years ago
If a temperature increase from 21.0 ∘c to 35.0 ∘c triples the rate constant for a reaction, what is the value of the activation
Airida [17]

Answer:

59.077 kJ/mol.

Explanation:

  • From Arrhenius law: <em>K = Ae(-Ea/RT)</em>

where, K is the rate constant of the reaction.

A is the Arrhenius factor.

Ea is the activation energy.

R is the general gas constant.

T is the temperature.

  • At different temperatures:

<em>ln(k₂/k₁) = Ea/R [(T₂-T₁)/(T₁T₂)]</em>

k₂ = 3k₁ , Ea = ??? J/mol, R = 8.314 J/mol.K, T₁ = 294.0 K, T₂ = 308.0 K.

ln(3k₁/k₁) = (Ea / 8.314 J/mol.K) [(308.0 K - 294.0 K) / (294.0 K x 308.0 K)]

∴ ln(3) = 1.859 x 10⁻⁵ Ea

∴ Ea = ln(3) / (1.859 x 10⁻⁵) = 59.077 kJ/mol.

4 0
3 years ago
How many grams are there in 10.0 moles of Al2O3?
irinina [24]

Explanation:

1 mole is equal to 1 moles Al2O3, or 101.961276 grams.

8 0
3 years ago
Calculate the molarity of a 2.43 mol aqueous NaCl solution with a density of 2.00 g/mL.
anygoal [31]

Answer:

You need to add more points people will not answer if its this low

Explanation:

3 0
3 years ago
Which two elements are combined in sodium chloride
Westkost [7]

Answer:

Sodium (Na) and Chlorine (CI)

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • It has been estimated that 8.0 x 10^4 tons of gold (Au) have been mined. Assume gold costs $1350 per troy ounce. What is the tot
    5·1 answer
  • In determining the percent acetic acid in vinegar, the mass of each of vinegar sample is measured rather than the volume. explai
    7·1 answer
  • What mass of potassium hydroxide is formed when 8.2 g of potassium oxide is added to 1.3 g of water? answer key?
    13·1 answer
  • Give the major organic products from the oxidation with KMnO4 for the following compounds. Assume an excess of KMnO4.
    8·1 answer
  • Why do people act like they are your friends, then talk and whisper behind your back to another?
    12·2 answers
  • What is the number of moles of 25.0 grams of molecules of SO and NO? How to compare and contrast?
    8·1 answer
  • Silicon is lustrous and is a conductor of heat and electricity. Which class of elements could this element belong to?
    12·1 answer
  • More heat is required to raise the temperature of water than any other substance. This is a description of the unique property o
    8·1 answer
  • How to find specific heat capacity of a liquid
    11·1 answer
  • Anyone please help I’m in summer school please
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!