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ale4655 [162]
3 years ago
14

Scientists can engage in many different activities in many different sequences.

Chemistry
1 answer:
S_A_V [24]3 years ago
4 0

Answer:D-when explaining and documenting their work

Explanation:I took the k-12 test and got it right!:) Hope this helps!!!!

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If a sample of copper is 215g, how many moles of copper atoms are in the sample?
shusha [124]

Answer:

3.38 moles.

Explanation:

The following data were obtained from the question:

Mass of copper (Cu) = 215 g

Number of mole of copper (Cu) =...?

The number of mole of copper (Cu) in 215 g can be obtained as follow:

Mass of copper (Cu) = 215 g

Molar mass of copper (Cu) = 63.55 g/mol

Number of mole of copper (Cu) =...?

Mole = mass /Molar mass

Mole of Cu = 215/63.55

Mole of Cu = 3.38 moles

Therefore, 3.38 moles of copper (Cu) is present in the sample.

6 0
4 years ago
In the teapot dome scandal, what did the secretary of the interior albert fall lease
yuradex [85]
Albert Fall secretly leased federal oil reserves for personal gain.
7 0
3 years ago
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(CO2) (O2) (He) (N2) (CH4) (Imagine these are balloons with the specified gas inside)
valentina_108 [34]

Answer:

Highest speed: He

Lowest speed: CO2

Explanation:

The rms speed (average speed) of the molecules/atoms in an ideal gas is given by:

v=\sqrt{\frac{3RT}{M}}

where

R is the gas constant

T is the absolute temperature of the gas

M is the molar mass of the gas, which is the mass of the gas per unit mole

From the equation, we see that at equal temperatures, the speed of the molecules in the gas is inversely proportional to the molar mass: the higher the molar mass, the lower the speed, and vice-versa.

In this problem, we have 5 gases:

(CO2) (O2) (He) (N2) (CH4)

Their molar mass is:

CO2: 44 g/mol

O2: 16 g/mol

He: 4 g/mol

N2: 14 g/mol

CH4: 16 g/mol

The gas with lowest molar mass is Helium (He): therefore, this is the gas with greatest average speed.

The gas with highest molar mass is CO2: therefore, this is the gas with lowest average speed.

8 0
4 years ago
A(n) _____ crystal has 4 even sides.
irina [24]
I’m pretty sure the answer is triclinic
4 0
3 years ago
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Which three elements are combined in magnesium carbonaye
meriva

Answer:

Magnesium, Carbon and Oxygen.

Explanation:

7 0
3 years ago
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