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3 years ago

If a solid is placed in a liquid and lots of bubbles are formed, is this a physical change

Chemistry

2 answers:

ELEN [110]3 years ago

8 0

Answer:

The formation of gas bubbles is often the result of a chemical change.

stellarik [79]3 years ago

3 0

Answer:

its a chemical change

Explanation:

hope it helps

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Problem: Janna, a student of a chemistry class, told her friend that she learnt in class that bottled water is not pure. Kim, he

Ghella [55]

Answer:

The bottle is labeled pure so it probably is pure.

Explanation:

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3 years ago

Identify a chemical reagent that can be used to distinguish solid CaCl2 from CaCO3

jenyasd209 [6]

<span>The words you seek are soluble and insoluble.The chemical you want is an acid. Add an acid (acetic acid or hydrochloric acid) and the CaCO3 will fizz but CaCl2 will not</span>

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3 years ago

How many moles are in 2.5L of 1.75 M Na2CO3

mixas84 [53]

Answer: There are 4.375 moles in 2.5 L of 1.75 M $Na_2CO_3$

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of solution = 1.75 M

Volume of solution = 2.5 L

Putting values in equation , we get:

$1.75M=\frac{\text{Moles of} Na_2CO_3}{2.5L}\\\\\text{Moles of }Na_2CO_3=1.75mol/L\times 2.5L=4.375mol$

6 0

3 years ago

What is 2.75 mol of O2

ANTONII [103]

Answer:

2,75 mol of O2 it's 88 g of O2.

Explanation:

The weight of the diatomic molecule O2 is 32 g/mol. So considering that, you should multiply 2,75 mol · 32 = 88g :)

3 0

3 years ago

What actions show conserving by reusing? Choose the two correct answers

hram777 [196]

A and D

Hope this helps

3 0

3 years ago