Answer:
5: 0.16
6: 50
Explanation:
Question 5:
We can use the equation density = mass/ volume.
We already have the mass (12g), but now we need to find the volume of the cylinder.
The equation for this is πr²h
So we know the radius is 2 and the height is 6.
π x (2)² x 6 = 24π = 75.398cm³
Now we can use the density equation above:
12/75.398 = 0.1592g/cm³ = 0.16g/cm³.
Question 6:
This time, we have to rearrange the equation density = mass/ volume to find the mass.
We know mass = density x volume.
From the question, the density is 2.5g/mL and the volume is 20mL.
Following the equation above, we do 2.5 x 20 to get 50g.
There are 118 naturally occurring elements
The pencil attached to the negative terminal of the battery collects hydrogen gas while the one connected to the positive terminal collects oxygen.
Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M 
solution.
Explanation:
Given: 
= 18.0 M, 
= ?
= 1.00 M, 
= 250 mL
Formula used to calculate the volume of concentrated acid is as follows.
Substitute the values into above formula as follows.
Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M solution.
Answer: 2HCO + 4O → H2 + 2CO3
Explanation: Oxomethyl + Oxygen = Dihydrogen + Carbon Trioxide
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