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Marianna [84]
3 years ago
12

How are mass and weight alike?

Chemistry
1 answer:
joja [24]3 years ago
7 0
Both mass and weight are measured by using scales.
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Can somebody plz tell me which one I should circle for each question thanks!!!
marusya05 [52]

Answer:

1. False

2. True  

3. True

4. True

5. False

Explanation:

7 0
2 years ago
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Josie observed that when water is boiled in an open beaker it completely disappears, leaving the beaker dry. What can Josie conc
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That when water is boiled in a open beaker and it disappears that it evaporates into the air
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3 years ago
One of your chores is to mow the lawn. The lawnmower runs on gasoline. The gasoline
trasher [3.6K]

B

Explanation:

Burning is a chemical change and cutting grass is a physical change

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3 years ago
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Consider the following reaction:C2H4(g) + F2(g) -----------> C2H4F2(g) Delta H = -549 kJEstimate the carbon-fluorine bond ene
frutty [35]

Answer:

Bond energy of carbon-fluorine bond is 485 kJ/mol

Explanation:

Enthalpy change for a reaction,  is given as:

\Delta H_{rxn}=\sum [n_{i}\times (E_{bond})_{i}]-\sum [n_{j}\times (E_{bond})_{j}]

Where (E_{bond})_{i}  and (E_{bond})_{j} represents average bond energy in breaking "i" th bond and forming "j" th bond respectively.n_{i} and n_{j} are number of moles of bond break and form respectively.

In this reaction, one mol of C=C, four moles of C-H and one mol of F-F bonds are broken. One mol of C-C bond, four moles of C-H bonds and two moles of C-F bonds are formed

So, -549kJ=(1mol\times 614kJ/mo)+(4mol\times E_{C-H})+(1mol\times 154kJ/mol)-(1mol\times 347kJ/mol)-(4mol\times E_{C-H})-(2mol\times E_{C-F})

or, -549kJ=(1mol\times 614kJ/mo)+(1mol\times 154kJ/mol)-(1mol\times 347kJ/mol)-(2mol\times E_{C-F})

or, E_{C-F}=485kJ/mol

So bond energy of carbon-fluorine bond is 485 kJ/mol

8 0
3 years ago
Which of the following molecules has a bent shape?
poizon [28]

A, because the shape of it forms and arc much like a H2O molecule.

4 0
2 years ago
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