4.10.B

Which type of elements are semiconductors?

• Metals

• Metalloids

• Nonmetals

• Gases

These elements are in a:

• group

• period

What determines the reactivity of an element?

• Size of its nucleus

• Number of total electrons

• Number of valence electrons

• Number of shells

Which processes of land formation were the student's models designed to show?

• Erosion by fast- moving water and erosion by wind

• Valley formation by moving water and valley formation by a glacier

• The formation of deltas by slowing water and the formation of oxbow lakes by erosion

• Weathering caused by chemical reactions and weathering caused by temperature changes

A ___ lens makes objects appear bigger.

• concave

• convex

• prism

• flat

What did the researchers consider in two different warming scenarios?

• Average global temperatures remain the same

• Average global temperatures decrease by 1 degree Fahrenheit

• Average global temperatures rise by 4.3 degrees Fahrenheit

• Average global temperatures rise by 2.5 degrees Fahrenheit

How much of the world's sandy beaches could disappear by the end of the century if climate change is not decreased?

• 25%

• 50%

• 75%

• 100%

Eyeglasses bend light to help the image form properly on the retina. The bending of light as it passes from one medium to another is called

• diffraction

• interference

• reflection

• refraction

What is the atomic number of the element with the symbol 'B'?

Which of the following elements is a metalloid?

• Boron

• Carbon

• Oxygen

• Nitrogen