Answer:
New volume is 25.0 mL
Explanation:
Let's assume the gas sample behaves ideally.
According to combined gas law for an ideal gas-
where, 
and 
represent initial and final pressure respectively
and 
represent initial and final volume respectively
and 
represent initial and final temperature (in kelvin) respectively
Here, 
, 
, 
and 
So, 
So, the new volume is 25.0 mL
Answer:
Radium (Ra)
Explanation:
The nuclear fuel at Chernobyl was uranium-235. However, one of the decay products of uranium-235 is radium.
Radium is chemically similar to calcium since it has two valence electrons and is the heaviest and last member of group 2.
Owing to its chemical similarity to calcium, it was able to replace calcium in people's teeth and bones. Radium is radioactive, the half life of Ra-226 is about 1602 years.
Other elements of group 2 are; beryllium, magnesium, strontium and barium.
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Answer:
d ≈ 0.098 g/mL
Explanation:
The density of a substance can be found by dividing the mass by the volume.
d=m/v
The mass of the substance is 0.221 grams and the volume is 2.25 milliliters.
m= 0.221 g
v= 2.25 mL
Substitute the values into the formula.
d= 0.221 g / 2.25 mL
Divide
d= 0.098222222 g/mL
Let’s round to the nearest thousandth. The 2 in the ten thousandths tells us to keep the 8 in the thousandth place.
d ≈ 0.098 g/mL
The density of the substance is about 0.098 grams per milliliter.
