2 years ago

When is work considered to be work? (this is about force,work and energy)

1 answer:

n200080 [17]2 years ago

8 0

Answer:

In summary, work is done when a force acts upon an object to cause a displacement. Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.

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For which compound does 0.256 mole weigh 12.8 g?

mylen [45]

Number of moles = $\frac{mass (g)}{Molar mass}$
so to calculate molar mass (Molecular weight of compound):
Molecular weight = $\frac{mass (g)}{number of moles}$
= $\frac{12.8 g}{0.256 mole}$ = 50 g / mole
Now we calculate molecular weight of each compound in choices:
a) C₂H₄O = 44
b) CO₂ = 44
c) CH₃Cl = 50.4 ALMOST 50 so this is the correct answer
d) C₂H₆ = 30

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3 years ago

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Nimfa-mama [501]

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3 years ago

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When two clear, colourless liquids are mixed together, a yellow precipitate is formed. This is an example of a

Flura [38]

Answer:

Combining the two clear colorless liquids is a chemical change.

Explanation:

Because a different solid substance is formed. Tell students that a precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Insoluble means that the solid will not dissolve.

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3 years ago

Find the density of metal with a volume 4.0 cm and a mass of 8.0 grams.

olga_2 [115]

D=m/v

so,

d=8.0g/4.0cm

d=2

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2 years ago

On which energy level are the valence electrons for calcium (Ca) ?

zhannawk [14.2K]

The fourth (last) one in 2-8-8-2.

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3 years ago