What of the following is an advantage of the thermal properties of plastic?
plastics are easy to mold into any shape
the thermal conductivity if plastic is very high, makin it a good material to transmit heat
plastics are safe to use in microwave ovens
heating plastics eliminates the risk of BPA exposure
The correct answer is: plastics are easy to mold into any shape.
as the pressure of a gas decreases to half it's original value, what happens to the volume of the gas if temperature is held constant?
The volume increases to four times it's original value
the volume increases to twice it's original value
the volume decreases to one-fourth of it's original value
the volume decreases to half of it's original value
Based on Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature, if the pressure of a gas decreases to half its original value, the volume of the gas will increase to twice its original value.
The correct answer is: the volume increases to twice its original value.
the relationships among which variable quantities are expressed by the ideal gas law equation?
pressure, volume, temperature, number of moles
volume, temperature, number of moles, gas constant
pressure, volume, number of moles, mass
pressure, volume, temperature, molar mass
The relationships among the variable quantities are expressed by the ideal gas law equation:
PV = nRT
where P represents pressure, V represents volume, n represents the number of moles, R is the gas constant, and T represents temperature.
The correct answer is: pressure, volume, temperature, number of moles.
which statement best describes what happens when oil and water are stirred together?
water molecules will attract each other electrically, but they will not attract oil molecules, causing separation
oil and water molecules have like charges, causing them to repel each other and separate
oil molecules will repel each other electrically, leading to complete mixing of the two substances
water and oil molecules have opposite electrical charges, causing them to repel each other and separate
The statement that best describes what happens when oil and water are stirred together is:
Water molecules will attract each other electrically, but they will not attract oil molecules, causing separation.
Due to their different polarities, water molecules form strong hydrogen bonds with each other, creating a cohesive force that causes them to stick together. Oil, on the other hand, is nonpolar and does not form strong interactions with water molecules. As a result, the water and oil will separate from each other, with the water forming distinct droplets or layers within the oil.
which substance is most likely to dissolve in greater quantities in cold water?
sodium chloride
sugar
oxygen
potassium chloride
The substance most likely to dissolve in greater quantities in cold water is sodium chloride.
The solubility of most solid substances, including sodium chloride, generally decreases as the temperature of the solvent (water) decreases. Therefore, more sodium chloride can dissolve in cold water compared to other substances.
Sugar, oxygen, and potassium chloride do not follow the same trend. Solubility of sugar generally increases with temperature, oxygen is not significantly soluble in water, and the solubility of potassium chloride may decrease or remain relatively constant with temperature depending on the specific conditions.