Answers Madison 2017 Phy Sci A-35 SSUnit Test

Unit Test — Unit test Answers

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Isra is analyzing the properties of several samples of elements to find out which sample is a metalloid. Which set of properties most likely belongs only to a metalloid?

forms basic compounds and is a solid

has a high luster and is very brittle

is a gas and has low electrical conductivity

is brittle and forms acidic compounds

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While looking at bromine (Br) on the periodic table, a student needs to find another element with very similar chemical properties but with a different atomic mass. Which best describes the student’s options?

There are two possible elements, and they are directly to the left and right of bromine.

There are two possible elements, and they are directly above and below bromine.

There are many possible elements, and they are all in the same vertical column as bromine.

There are many possible elements, and they are all in the same horizontal row as bromine.

Which metal is most likely to form more than one kind of positively charged ion?

sodium (Na)

barium (Ba)

nickel (Ni)

magnesium (Mg)

Where are alkaline earth metals found on the periodic table?

Group 1

Group 2

Groups 3–12

Group 17

Sonya is studying a nonmetal element. She learns that the element is like other elements in its group because it can bond to form a salt or an acid. She also learns that the element is the most reactive element in its group. Which element is Sonya most likely studying?

sulfur (S)

neon (Ne)

fluorine (F)

iodine (I)

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors?

Electronic devices have become smaller.

Electronic devices are now more brittle.

Electronic devices now use more energy.

Electronic devices have become more expensive.

What is an atomic nucleus?

the outer part of an atom in which electrons move

the outer part of an atom in which neutrons move

the central part of an atom, composed of protons and neutrons

the central part of an atom, composed of protons and electrons

How does Rutherford’s model of the atom compare with Thomson’s model?

They both describe atoms as small, indivisible spheres.

They both describe electrons as moving around the nucleus.

They both describe electrons as being surrounded by the positive matter.

They both describe atoms as being made up of positive and negative matter.

Which element is most likely to carry electric current easily?

tin (Sn)

sulfur (S)

antimony (Sb)

selenium (Se)

What best describes the states of nonmetals when they are at room temperature?

Most nonmetals are gaseous, but some are liquid or solid.

All nonmetals are gaseous unless they bond with a metal.

Most nonmetals are solids, but some are gaseous or liquid.

All nonmetals are solid unless they bond with a metal.

Students are completing a table about a particular subatomic particle that helps make up an atom.What best explains how they should complete the table?

with “Inside the nucleus,” because the particle is a proton

with “Inside the nucleus,” because the particle is a neutron

with “Outside the nucleus,” because the particle is a proton

with “Outside the nucleus,” because the particle is an electron

Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?

calcium, magnesium, strontium

magnesium, calcium, strontium

strontium, calcium, magnesium

strontium, magnesium, calcium

Which statement describes the location of most metalloids on the periodic table?

The metalloids are located below metals and above nonmetals within a group.

The metalloids are located below nonmetals and above metals within a group.

The metalloids are located to the right of nonmetals and to the right of metals within a period.

The metalloids are located to the left of nonmetals and to the left of metals within a period.

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

The atom has 7 neutrons and 8 protons.

The atom has 7 electrons and 8 protons.

The atom has 8 neutrons and 7 electrons.

The atom has 8 electrons and 7 protons.

These models show the electron structures of two different nonmetal elements.

Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.

Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.

Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.

Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

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