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.
in 3-5 sentences, summarize how the change of state from ice to water is affected by the relationship between kinetic energy and the forces of attraction. Write it as if a 8th grader with limited vocab would
When ice changes into water, it's because the little water particles are getting more excited and moving faster. They have more kinetic energy! The forces that hold the particles of ice together, like a bumpy road, start to become weaker. So, the particles of ice get all bouncy and break apart, turning into water. It's like when you play with blocks and they start falling down because you bumped them too hard.
in 3-5 sentences, summarize how the change of state from ice to water is affected by the relationship between kinetic energy and the forces of attraction. Write it as if a 16 year old was writing it
The change of state from ice to water occurs due to the interplay between kinetic energy and the forces of attraction. When heat is added to ice, kinetic energy is transferred to the ice particles. As the particles gain energy, they start to vibrate more vigorously, weakening the forces of attraction between them. Eventually, these forces become weaker than the particle's kinetic energy, causing the rigid structure of ice to break down. This breakage allows the particles to move more freely, resulting in the change of state from solid ice to liquid water.
Liquids take the shape of the bottom of their container, while gases take the shape of their entire container. The shape solids take, however, is independent of their container. In 3-5 sentences, explain these patterns. Write it as if a 15 year old was writing it
Liquids like water or juice take the shape of the bottom of their container because their particles can slide and flow around. They don't have a fixed shape like solids, so they can adjust to fit the shape of the container. Gases, on the other hand, are super free and have lots of space between their particles. They can spread out and take the shape of the whole container, like when air fills up a balloon. Solids have particles that are tightly packed and don't have much wiggle room. They have a fixed shape, like a rock, and don't change to fit their container.
Liquid water can be separated into hydrogen gas and oxygen gas through electrolysis. 1 mole of hydrogen gas and 0.5 moles of oxygen gas is produced from 1 mole of liquid water collected in separate 10 L containers are 1 atm. Will the temperatures of the gases be equal? In one to two sentences, use the ideal gas law to explain your answer. Write it as if a 15 year old was writing it
No, the temperatures of the gases will not be equal. According to the ideal gas law, gases at the same temperature, pressure, and volume should have the same number of moles. Since 1 mole of hydrogen gas is produced compared to 0.5 moles of oxygen gas, the number of moles is different, suggesting that the temperatures of the gases will also be different.
who helped develop salsa music?
Cuban and Puerto Rican immigrants
Mexican musician
Central American performers
European composers