3 years ago

What is the independent and dependent variable

1 answer:

8 0

Independent- controlled in a scientific experiment to test the effects a dependent is being tested and measured in a scientific experimrent

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Tungsten fits best into which category?

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B. Element

Explanation:

Tungsten is an chemical element

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What do a mole of magnesium (Mg) and a mole of iron (Fe) have in common?

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What they have in common is that they both have the same number of atoms.

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Granite is a ________ that contains the mineral quartz. a. mineral c. rock b. glass d. mica

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I think it would be C

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What is the valency of hydroxide

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3 years ago

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