Last Second Review

***A Periodic Table is shown with 4 elements numbered.

Select the Element that is a Metal.

Select 1 correct answer.

• Fluoride, F

• Tellurium, Te

• Calcium, Ca

• Gadolinium, Gd

***A chemist studies the malleability of different elements in period 4 of the Periodic Table. He tries to pound each metal into a sheet with a mallet. Predict which element has the least malleability.

• Nickel, Ni

• Germanium, Ge

• Titanium, Ti

• Arsenic, As

***Susanne studies a sample of an unknown material in the chemistry lab. She observes that it is not shiny. She can easily bend it and shape it, as it can be cut with a knife. Susanne masses the sample and then submerges it in water in a volumetric flask. When she calculates the density by dividing the mass by the volume displaced in the flask she finds that it is about 1.55 g/cm^3. Susanne wonders how that compares to other materials. She looks up the density of iron and finds that it’s close to 8 g/cm^3. She checks and finds that the density of gold is even greater, above 19 g/cm^3. Susanne concludes that the density of the unknown material is low compared to other substances.

What is the most likely location for the 

sample that Susanne studied on the 

Periodic Table?

• A

• C

• D

• E

• F

An unidentified sample of an element is gray-white and shiny. When it is heated, it conducts heat but when it is cooled it acts as an insulator. In which location on the periodic table could the element be found?

• II Only

• I Only

• I or II

• I, II, or III

Tags

NGSS.MS-PS1-4

An electronic device requires a material that conducts electricity well at high temperatures, but not at low temperatures. The material is made from an element in period 3. In which group is it found?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

In order to light a bulb such as the one in the image, electricity is produced at a power plant, most often by burning fossil fuels.

During this energy transformation, from where does the energy come from?

• 1. Kinetic energy from the mass of the fuel

• 1. Kinetic energy from speed of burning

• 1. Potential energy from elasticity

• 1. Potential energy from chemical bonds

***Mia saw demonstrations at school about energy transformations. She made a list of actions that she sees or does at home and described how the energy is transferred or transformed. Which description of an energy transfer on Mia’s list is correct?

• 1. When my black cat sits in the sunny window, radiant energy transforms to thermal energy.

• The chemical energy from my tuna sandwich transforms to chemical energy when I walk.

• When I turn on the burner on the gas stove, chemical energy in the gas transforms to mechanical energy.

• 1. When I drop a book from my desk, potential energy transforms to chemical energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Bob ate a big breakfast to give himself energy for the day. Then he got on his bicycle and rode to school. Bob observed that his bicycle had mechanical energy as it moved. When he applied the brake, the mechanical energy decreased. Bob noticed that after he used the break, it felt warm to the touch. When he got to school, Bob described how using the break on his bicycle demonstrated an energy transformation.

Which scientific explanation correctly describes an energy transformation Bob observed?

• 1. When Bob applied the brake, some of the mechanical energy of the bicycle transformed to thermal energy.

• 1. Pedaling the bicycle created electrical energy and the electrical energy made the brake warm when Bob used it.

• 1. When Bob applied the brake, some of the chemical energy in his body was transformed into electrical energy.

• 1. Thermal energy was stored in Bob’s body from breakfast, and it transformed to chemical energy as he applied the brake.

Tags

NGSS.MS-PS3-5

Maria and her dad enjoy working on the engine of the family car. Most car engines are internal combustion engines, engines that burn fuel such as gasoline to provide energy. Maria made a list of the kinds of energy she observed in the car engine:

• Chemical energy: gasoline contains stored energy

• Mechanical energy: parts of the engine move as it runs

• Thermal energy: the engine gets hot

• Sound energy: the engine makes a noise as it runs

Which energy transformation is NOT demonstrated by a car engine?

• • Sound energy transforms to thermal energy

• • Mechanical energy transforms to thermal energy

• • Chemical energy transforms to mechanical energy

• • Mechanical energy transforms to sound energy

Green plants and other producers use the process of photosynthesis to transform energy from the sun into energy from food. Which formula best represents the energy transformation that occurs during photosynthesis?

• Thermal Energy —> Kinetic Energy

• Chemical Energy —> Mechanical Energy

• Radiant Energy —> Chemical Energy

• Potential Energy —> Electric Energy

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3