Use your periodic table and the given atomic numbers to locate the elements. Then, use their group number to determine how many valence electrons each has. Krypton (Kr) atomic # 36 8

Fluorine (F) atomic # 9 7

Francium (F) atomic # 87 1 Tin (Sn) atomic # 50 4

Match each element with the correct piece of information. Use your periodic table cation; extremely reactive with water; 1 valence electron Rubidium (Rb) atomic #37 semiconductor; brittle; 5 valence electrons Antimony (Sb) atomic #51

Period 5, does not form ions, low melting point Xenon (Xe) atomic #54

forms -1 anions, nonmetal, gains 1 electron Chlorine (Cl) atomic #17

6 valence electrons, brittle, does not conduct electricity Sulfur (S) atomic #16

Sometimes in the winter, ice crystals grow directly from the moisture in the air. As the water changes from a gas to a solid, the molecules

slow down as they lose energy. ✅

Match the models with their states.

A plasma B liquid C solid D gas ✅

An aerosol can of spray paint is accidentally left out in the sun. As the temperature inside the can increases, the pressure increases too. This occurs because

as heat is added to the system, the temperature increases and so does the motion of the particles. When the particles are moving faster, they collide more often with the sides of the container, increasing the pressure.✅

It is a cool autumn afternoon with temperatures hovering just above 50 degrees. When the sun sets, the temperature drops, and dew forms on the grass. What happens to the water molecules as this occurs?

The water molecules will __ (slow down) as they ___(lose) energy.

The water molecules will move___(closer together) and change from a __ (gas) to a liquid forming the dew.

Elliott drives a Toyota Sonata. He wants to explain why he should keep a safe following distance behind a motorcycle when driving his car on the highway. Here's what he came up with:

1. The motorcycle has much less mass and inertia than his car.

2. Because the motorcycle has less inertia, it is much more difficult to change its motion.

3. The motorcycle can slow down much more easily and quickly than a car can.

4. So if you are too close and the motorcycle slams on its brakes, you won't be able to stop before hitting the motorcycle.

Where did Elliott go wrong in his explanation?

In step 2, it will be easier to change the motion of the motorcycle. ✅

Stick Man exerts 125 Newtons of force to push the refrigerator up the ramp into the truck.

The refrigerator has a weight of 1000 Newtons.

What is the mechanical advantage of the ramp?

Answer is 8✅

Once the refrigerator was loaded, Stick Man left to deliver it. It took 45 seconds to accelerate from rest to its top speed of 11 m/s (25 mph) in the residential neighborhood.

At what rate did the truck accelerate?

Answer is 0.244 m/s2✅

Stick Man is thinking of a wave . . . . .it doesn't require a mediumit has frequencies that are inversely related to its wavelength . . . it slows down when it travels from air into water.

What wave is Stick thinking of? electromagnetic ✅

Althea is thinking of another wave.

Her wave cannot travel through a vacuum, has an amplitude based on the energy it is carrying and travels faster as the medium becomes more dense.

What wave is Hannah thinking of? sound✅

A Porche 911 automobile draws 2.5 amps of current when starting. The resistance of the circuit is 4.8 Ohms.

What is the potential difference of the car's battery? 12V✅

When one bulb burns out, the rest stay on. What type of circuit is present? parallel✅

How will each affect the strength of the magnetic field produced by an electromagnet?

The potential difference (voltage) is tripled.

Half the current is supplied. half as strong✅

5 times more coils 5 times as strong✅

An iron core that is 1/4 the mass of iron 1/4th as strong✅

The direction of the current is switched. same strength✅