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Rudiy27
2 years ago
14

Describe two observations you might make when a chemical change occurs

Chemistry
1 answer:
Sav [38]2 years ago
7 0
The first one is color change
Second is the precipitate present
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A 30-g car rolls from a hill 12 cm high and is traveling at 154 cm/s as it travels along a 275 cm horizontal track. What is the
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Answer:

Explanation:

By definition, the momentum is given by:

p=m*v

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v: speed of the car

Substituting the values in the given definition we have:

p=3*154

Answer:

the momentum of the car is:

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What is the molarity of a solution that contains 0.400 mol HCI in 9.79 L solutions ​
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Molarity's formula is known as: Molarity(M)=moles of solute/liters solution.

In this case we are already given moles and liters so you just have to plug the numbers into the equation.

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If you were to use scientific notation, the answer will be: 4.1*10^-2, but otherwise, you can just use the decimals above and round appropriately as you see fit.

6 0
3 years ago
What does the skeletal system work with?
pshichka [43]

Answer:Shape

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