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
Lady_Fox [76]
3 years ago
12

What are 2 indications that a chemical change has occurred?

Chemistry
1 answer:
irakobra [83]3 years ago
8 0

Answer:  The color has changed or the formation of light and heat. Also, the temprature will change as well.

Explanation:

You might be interested in
What is the electron configuration for the Magnesium ion?​
soldi70 [24.7K]
1s^2 2s^2 2p^6 for the Mg2+ ion.
4 0
2 years ago
Idenatify the pair in which the formula does not match the name
MissTica
What're the options?

3 0
3 years ago
When was the idea of a atom first devloped
bija089 [108]

Answer:

Around 450 B.C.

Explanation:

The idea was forgotten until the 1800 when John Dalton re-introduced the atom.

6 0
2 years ago
Which of the following is not an example of a polymer?
Nady [450]
I believe the correct answer from the choices listed above is the third option. It is amino acid that is not an example of a polymer. It <span> is a large molecule, or macromolecule, composed of many repeated subunits. Hope this answers the question.</span>
7 0
3 years ago
If a sample has 25% parent and 75% daughter, how many halflifes have gone by?
Anit [1.1K]

Answer:

Two half lives.

Explanation:

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.

So, for a sample has 25% parent and 75% daughter it will have two half-lives.

6 0
3 years ago
Other questions:
  • Naturally occurring neon exists as three isotopes. 90.51% is ne-20 with a mass of 19.99 amu, 0.27% is ne-21 with a mass of 20.99
    8·1 answer
  • Glucose helps maintain life on our planet by storing
    15·1 answer
  • The number of __________ in an atom’s nucleus is equal to its ___________ number?
    11·1 answer
  • In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?
    14·1 answer
  • You place 36.5 ml of 0.266 M Ba(OH)2 in a coffee-cup calorimeter at 25.00°C and add 56.6 ml of 0.648 M HCl, also at 25.00°C. Aft
    12·1 answer
  • I'll give 50 pts and brainliest
    5·1 answer
  • A neutral atom in the ground state has four electrons in its fifth and outermost principal energy level. What element is it?
    11·1 answer
  • Why do we see different phases of the moon.
    14·2 answers
  • Assume the average apple has a mass of 167 grams. How many apples are in a bag of apples that weighs 2000 grams? Enter your numb
    13·1 answer
  • Help a kid in need, easy points.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!