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
OLga [1]
3 years ago
11

Which process is an example of a chemical change?

Chemistry
2 answers:
Alinara [238K]3 years ago
6 0

Answer:

d- activating a glow stick

Explanation:

Glow sticks produce light through a chemical reaction.

Ilia_Sergeevich [38]3 years ago
5 0

Answer:

burning of paper

melting of lead

You might be interested in
Why do two oxygen atoms form a double covalent bond?
elena-s [515]

A lone oxygen atom has 6 electrons in its outer shell which is not very stable, whereas as full octet (8 outer shell electrons) is stable. In order to achieve this two oxygen atoms will share 4 electrons, each contributing 2 electrons. Since these electrons exist within the orbitals of both atoms, to oxygen atoms essentially achieve a full octet.

5 0
3 years ago
PLEASE HELP ASAP!
choli [55]

Answer:

\large \boxed{\text{D. 710 g}}

Explanation:

1. Calculate the molar mass of Na₂SO₄

\begin{array}{ccc}\textbf{Atoms} &\textbf{M}_{\textbf{r}} & \textbf{Mass/u}\\\text{2Na} & 23 & 46\\\text{1S} & 32 & 32\\\text{4O}&16 & 64\\&\text{TOTAL =} & \mathbf{142}\\\end{array}

The molar mass of Na₂SO₄ is 142 g/mol.

2. Calculate the moles of Na₂SO₄

\text{Moles of Na$_{2}$SO}_{4} = \text{2.5 L solution} \times \dfrac{\text{2.0 mol Na$_{2}$SO}_{4}}{\text{1 L solution}} = \text{5.0 mol Na$_{2}$SO}_{4}

3. Calculate the mass of Na₂SO₄

\text{Mass of Na$_{2}$SO}_{4} = \text{5.0 mol Na$_{2}$SO}_{4} \times \dfrac{\text{142 g Na$_{2}$SO}_{4}}{\text{1 mol Na$_{2}$SO}_{4}} = \text{710 g Na$_{2}$SO}_{4}\\\\\text{You need } \large \boxed{\textbf{710 g}} \text{ of Na$_{2}$SO}_{4}

6 0
3 years ago
Describe the difference beetween an extensive and intesive property
olasank [31]

Extensive properties, such as mass and volume, depend on the amount of matter being measured. Intensive properties, such as density and color, do not depend on the amount of the substance present. Physical properties can be measured without changing a substance's chemical identity.

7 0
3 years ago
Please Answer ASAP
adelina 88 [10]

The answer to this question would be S2o6 which is C.


3 0
3 years ago
Read 2 more answers
Hot glass looks the same as cold glass?
Finger [1]

Answer:

This is true. A hot glass does look the same as a cold glass. Glass won't change its look if it's below 648 degrees Celsius.

7 0
3 years ago
Read 2 more answers
Other questions:
  • A chemist determined by measurements that 0.050 moles of aluminum participated in a chemical reaction. Calculate the mass of alu
    8·1 answer
  • A 4.36-g sample of an unknown alkali metal hydroxide is dissolved in 100.0 mL of water. An acid-base indicator is added, and the
    8·1 answer
  • Which character of Life distinguishes a fire and a flowering plant​
    5·1 answer
  • During which phase of the moon do neap tides occur
    7·2 answers
  • What is the symbol of gold ​
    11·2 answers
  • What conditions are needed to prevent iron from rusting?​
    11·1 answer
  • The group that does not receive a treatment during an experiment is called the?
    12·1 answer
  • What is the limiting reactant if 12 moles of p4 react with 15 moles of o2?.
    8·1 answer
  • Help Light reflecting from the aluminum coating on a CD ____________ and then interferes.
    9·1 answer
  • Which object will have the greatest gravitational pull?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!