Exam 2: Particles of Matter

A little girl sits in a car at a traffic light holding a helium-filled balloon as shown in the illustration below. The windows are closed and the car is relatively airtight. When the light turns green and the car accelerates forward, her head pitches backward but the balloon pitches forward. Why?

Which of the following best describes a gas?

Which is more evident: potential or kinetic energy?

Why do aerosol cans explode if heated?

Which has more total energy: a cup of boiling water at 100°C or a swimming pool of slightly cooler water at 90°C?

Which of the following is not a volume measurement?

How many milliliters of air are there in a hole measuring 5 L?

Imagine that you can see individual molecules. You watch a small collection of molecules that are moving around slowly while vibrating and bumping against each other. The slower moving molecules then start to line up, but as they do so their vibrations increase. Soon all the molecules are aligned and vibrating about fixed positions. What is happening?

If the density of a block of ice is 0.92 g/mL, what is the volume of 100. g of ice?

Gas particles travel at speeds of up to 500 meters per second. Why, then, does it take so long for gas molecules to travel the length of a room?

When you suck through a soda straw into a drink as shown in the illustration below, what causes the drink to rise into your mouth: the muscles of your lungs and cheeks or the weight of the atmosphere?

You take 50 mL of small BB's and combine them with of large BB's and you get a total of 90 mL of BB's of mixed size. Which of the following statements best explains this?

At a depth of about 10 meters the water pressure on you is equal to the pressure of 1 atmosphere. The total pressure on you is therefore 2 atmospheres-1 atm from the water and a second atm from the air above the water. When the glass shown below is pushed down to a depth of around 10 meters in depth, what will be the level of the water on the inside of the glass?

The value 300 joules could be a measure of ________.

Alchemist of the Middle Ages believed that ________.

With increasing temperature the density of air ________.

Which of the following is an example of something best described as having kinetic energy?

Aristotle described the composition and behavior of matter ________.

Gravity on the moon is only 1/6 as strong as gravity on the earth. What is the mass of a 10 kg object on the moon and on the earth?

When a concentrated acid and fresh water, both at room temperature, are mixed together the result is a solution that is very hot. How does Aristotle's model of matter explain this?