2 years ago

If you place rice on top or a speaker, what will happen to the rice when you turn the speaker on?

Chemistry

1 answer:

Dovator [93]2 years ago

3 0

Answer:

The rice will move

Explanation:

the sound vibration and waves will cause the rice to move

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Mercury thermometers work because mercury ____ when it is warmed

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Mercury expands when it is heated. This process is called thermal expansion.

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3 years ago

Concrete is made of an uneven mixture of gravel, sand, and water. It is _____. homogenous heterogeneous a solution a solute

Kobotan [32]

heterogeneous, because it does not have a uniform texture

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2 years ago

For every 4 hours that Alexa babysit her younger sister, her mom pays her $50

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A hypothetical metal crystallizes with the face-centered cubic unit cell. The radius of the metal atom is 234 picometers and its

AleksAgata [21]

Answer:

$\delta=101.13 g/cm^3$

Explanation:

As can be seen in the Figure in a face-centered cubic unit cell you have:

Six halves of atoms
Eight 1/8 of atom (1 in each corner)

In total:

$n_{atom}=6*0.5+8*\frac{1}{8}=4 atoms$

Now, each side of the cell is 234 picometers (2.34e-8 cm) long

$V_{cell}=L^3=(2.34e^{-8} cm)^3$

$V_{cell}=1.28*10^{-23}cm^3$

Atoms per cm3:

$n=\frac{4 atoms}{1.28*10^{-23}cm^3}$

$n=3.12*10^{23} atoms/cm^3$

Expressing in mass:

$\delta=3.12*10^{23} atoms/cm^3* \frac{1 mol}{6.022*10^{23}}*195.08 g/mol$

$\delta=101.13 g/cm^3$

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3 years ago

Is 2H2 + O2=2H2O a balanced equation

Mnenie [13.5K]

Explanation:

Yes, the equation is balanced. There are the same number of Hydrogen (H) and Oxygen (O) atoms on both sides of the equation.

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2 years ago