The 4th one I’m pretty sure.
Answer:
Density = 7.87 grams per mL
Explanation:
Density is given by the formula:
where
Z = effective number of atoms in one unit cell.
M = Molecular mass of the substance
a = edge length of unit cell
Na = Avogadro number = 6.022×10²³
In this case:
Z=2 as it is body-centered type unit cell
M = 56 g per mole for iron
a = 287 pm =
Substituting the above values in the density formula we get:
Density of iron is 7.87 grams per mL.
Arrows are usually used to show forces on objects.
Answer: Because hydrogen is a gas.
Explanation: If children were running around with balloons filled with hydrogen gas, then they would catch fire. So the answer to your question is, its simply dangerous.
Answer:
what are the options because a graduated cylinder is a science mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid
Explanation: