6.5A 6.5C

Which of the following is the best label for the second column?

• Metalloids

• Pure Substances

• Compounds

• Science Stuff

Look at the circle graph of the different elements in Earth's crust.

Based on the graph, which conclusion can be drawn about the elements in Earth's Crust? (6.5B)

• Iron is more abundant than sodium.

• Silicon is more abundant than oxygen.

• Aluminum is more abundant than silicon.

• Calcium is more abundant than magnesium.

Which word describes two or more elements that are mixed together in a fixed proportion? (6.5C)

• mixture

• Compound

• Element

• Atom

A scientist isolates an element during an experiment. How can he know that it is an element? (6.5C)

• It is made up of only one type of atom.

• It is made up of exactly two types or atoms.

• It is in the periodic table.

• It has characteristics.

Tags

NGSS.MS-PS1-1

This contains a variety elements and compounds that ARE NOT chemically combined.

• Water
• Mixture
• Elements
• Compounds

John was observing the physical properties of elements in order to classify them as either a metal, nonmetal, or metalloid. The first element was dull, brittle, and do not conduct heat, what is the element most likely classified as (6.6A)

• metal

• metalloid

• nonmetal

Which of the following correctly list the three main groups of elements from greatest conductivity to least conductivity? (6.6A)

• Nonmetals-metalloids- metals

• metals-nonmetals-metalloids

• metalloids-metal-nonmetals

• Metals-metalloids-nonmetals

A student is given a sample of an unknown substance. He is asked to determine if it is classified as a metal, a metalloid, or a nonmetal. He discovered that the unknown element conducted some heat and electricity, had a shine luster, and broke easily. this element is most likely a (6.6A) -

• metal

• nonmetal

• metalloid

• cannot be determined

What is the chemical symbol for hydrogen?

• He

• h

• H

• hy

All of the following are elements except...

• Nitrogen

• Sodium

• Neon

• Water

Tags

NGSS.MS-PS1-1