Which of the following are physical rather than chemical properties of hydrogen gas (h2)? choose one or more:
a. liquefied h2 boils at a very low temperature (–253.7°c).
b. h2 gas does not conduct electricity.
c. at room temperature, its density is less than that of any other gas.
d. it reacts vigorously with oxygen (o2) to form water.

A. Liquefied boils at a very low temperature (–253.7°C).

B. gas does not conduct electricity.

C. At room temperature, its density is less than that of any other gas.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Example: reacts vigorously with oxygen to form water.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Example: Liquefied boils at a very low temperature (–253.7°C).It only changes state.

gas does not conduct electricity.It is only about movement of electrons.

At room temperature, density is less than that of any other gas. It is only about mass present per unit volume.

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.