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
Julli [10]
2 years ago
7

Which TWO observations are evidence that a chemical change is happening?

Chemistry
1 answer:
Kryger [21]2 years ago
7 0

Answer: it is B and D light

Explanation: when a spark happens that is changing and bubbles is also changing

You might be interested in
What is the volume of 60 g of ether if the density of ether is 70 g/mL
NNADVOKAT [17]
V = 60.0 g/ 0.70 g/mL = 85.7 mL Hope this helps! ;D
4 0
3 years ago
A jar is filled with water, and the lid is closed tightly. The jar is kept at constant temperature. What happens at the surface
Katarina [22]
<h2>Hello!</h2>

The correct answer is A: Water molecules evaporate and condense at the same rate.

<h2>Why?</h2>

Evaporation is defined as the physical change from liquid to gas, and Condensation is the physical change from gas to liquid.

At any given temperature, these two processes occur at once, in a dynamic equilibrium.

When the lid is closed, evaporation occurs faster than condensation, and pressure increases. Then, when pressure reaches a critical value, condensation starts to occur faster than evaporation, until an equilibrium is reached, and the pressure of the water molecules in the gas phase is maximum for that temperature. The pressure at that point is called Vapor Pressure.

Have a nice day!

5 0
2 years ago
Mixtures can be separated by filtration and distillation. Both methods take advantage of ...
bagirrra123 [75]
<span>differences in the physical properties of the mixture's components</span>
5 0
3 years ago
I need Helpppp with my chemistry while we are out of school. I don't have a good teacher and he's not helping since it's his las
9966 [12]

Answer:

im not sure but I hope this helps

Explanation:

I believe the equivalents is just the moles reactant/moles limiting reactant

water has a denisty of 1 g/mL. 1 L is 1000 ml so there are 1000g/L.

the molar mass of water is 18g/mol if you use the Liters in the equation above you can find the number of grams present. divide this number you found by 18 to find the moles.

now take the amount of the other reactant given and divide it by its own molar mass. this will give you the number of moles of that reactant.

divide the moles of water by the moles of the reactant and that is the equivalent.

to find the normality you take this number and divide it by the number of liters.

5 0
2 years ago
I need help with homework
Aliun [14]
Number 9 is A and 10 is A
5 0
2 years ago
Other questions:
  • What type of coloration do the stonefish and oscellated frog fish have
    15·1 answer
  • A 72.0-gram piece of metal at 96.0 °C is placed in 130.0 g of water in a calorimeter at 25.5 °C. The final temperature in the ca
    9·1 answer
  • Calculate H for the process Hg2Cl2 ? 2Hg + Cl2 from the following information:
    13·1 answer
  • Hugh described two substances which participate in photosynthesis.
    5·2 answers
  • the atom was thought to be indivisible. Explain the significance of Thomson's concept of the electron.
    9·1 answer
  • The cochlea is a liquid-filled cavity in the inner ear.<br> t or f?
    14·1 answer
  • An ideal gas has a volume of 14.5 L in a flexible balloon at 680.0 mmHg at
    5·1 answer
  • Balance the equation !!!
    7·1 answer
  • Please help me with this questions
    10·1 answer
  • Is that flirting? I'm not sure and I really need to know-
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!