Social studies chapter 15 section 3 assessment?

Answer 1

Chapter 15 SECTION 3 AssessmentReviewing Key Concepts

1. (a) Defining What properties of metals do the terms conductivity and ductility describe?

(b) Classifying Give an example of how the ductility of metal can be useful.

(c) Inferring What property of metals led to the use of plastic or wood handles on many metal cooking utensils? Explain.

1. (a) Identifying What family of elements in the Periodic Table contains the most reactive metals?

(b) Applying Concepts What area of the periodic table is the best place to look for a metal that could be used to coat another metal to protect it from corrosion?

(c) Predicting If scientists could produce element 120, what predictions would you make about its reactivity?

1. (a) Describing Describe the general process by which new elements are synthesized.

(b) Applying Concepts How is plutonium made?

1a.A ductile material is one that can be pulled out, or drawn, into a long wire. For example, copper can be made into thin sheets and wire because it is malleable and ductile.

conductivity is the ability of an object to transfer heat or electricity to another object. Most metals are good conductors. In addition, a few metals are magnetic. For example, iron (Fe), cobalt (Co), and nickel (Ni) are attracted to magnets.

b.For example, copper can be made into thin sheets and wire because it is malleable and ductile.

c.Good thermal conductivity of metals means that metal handles get hot- plastic and wood are poorer conductors of heat so are cooler.

2a.The metals in Group 1, from lithium to francium, are called the alkali metals.Alkali metals react with other elements by losing one electron. These metals are so reactive that they are never found as uncombined elements in nature. Instead, they are found only in compounds. In the laboratory, scientists have been able to isolate alkali metals from their compounds. As pure, uncombined elements, some of the alkali metals are shiny and so soft that you can cut them with a plastic knife.

b.Only some of the elements in Groups 13 through 15 of the periodic table are metals. These metals are not nearly as reactive as those on the left side of the table. The most familiar of these metals are aluminum, tin, and lead. Aluminum is the lightweight metal used in beverage cans and airplane bodies. A thin coating of tin protects steel from corrosion in some cans of food. Lead was once used in paints and water pipes. But lead is poisonous, so it is no longer used for these purposes. Now, its most common uses are in automobile batteries and weights for balancing tires.

3a.Alkali metals react with other elements by losing one electron. These metals are so reactive that they are never found as uncombined elements in nature. Instead, they are found only in compounds. In the laboratory, scientists have been able to isolate alkali metals from their compounds. As pure, uncombined elements, some of the alkali metals are shiny and so soft that you can cut them with aplastic knife.

b.Elements with atomic numbers higher than 92 are sometimes described as synthetic elements because they are not found naturally on Earth. Instead, elements that follow uranium are made-or synthesized-when nuclear particles are forced to crash into one another.

c.plutonium is made by bombarding nuclei of uranium-238 with neutrons in a nuclear reactor. Americium-241 (Am-241) is made by bombarding plutonium nuclei with neutrons.

SECTION 4 AssessmentReviewing Key Concepts

1. (a) Reviewing What physical and chemical properties are found among the nonmetals?

(b) Making Generalizations What happens to the atoms of most nonmetals when they react with other elements?

(c) Comparing And Contrasting How do the physical and chemical properties of the halogens compare with those of the noble gases?

1. (a) Identifying Where in the periodic table are the metalloids found?

(b) Describing What are three uses of metalloids?

(c) Applying Concepts What property makes certain metalloids useful as "switches" to turn a small electric current on and off?

1a.Most nonmetals are poor conductors of electricity and heat and are reactive with other elements. Solid nonmetals are dull and brittle.

b.Atoms of nonmetals usually gain or share electrons when they react with other atoms. When nonmetals and metals react, electrons move from the metal atoms to the nonmetal atoms.Many nonmetals can also form compounds with other nonmetals. The atoms share electrons and become bonded together into molecules.

c.

2a. All are solids at room temperature. They are brittle, hard, and somewhat reactive.

The most common metalloid is silicon (Si). Silicon combines with oxygen to form silicon dioxide (SiO2). Ordinary sand, which is mostly SiO2, is the main component of glass. A compound of boron (B) and oxygen is added during the process of glassmaking to make heat-resistant glass. Compounds of boron are also used in some cleaning materials.

b.The most useful property of the metalloids is their varying ability to conduct electricity. Whether or not a metalloid conducts electricity can depend on temperature, exposure to light, or the presence of small amounts of impurities.

c.Semiconductors are substances that can conduct electricity under some conditions but not under other conditions.

English class

The editor censored the history books.

The art exhibit included paintings by Picasso.

The curator gave us a tour of the museum.

Oppressed people are not allowed to use freedom of speech.

Theprominent politician spoke at the graduation.

She made an allusion to the fact that he had been in prison.

The angel was playing a lyre.

When her son admitted he had stolen the car, his mother was aghast.

They made an impetuous decision to get married at 18 years old.

Her dream was to visit the north and see the aurora borealis.

The dead dog was taken to the crematorium before the family spread his ashes.

Watching the scary movie was grisly.

He loathed his mother's salty cooking.

The poet used alliteration to make her poem more musical.

The word sizzle is an example of onomatopoeia.

Answer 2

I'm unable to provide verbatim content from specific resources such as social studies assessments. However, if you have any specific questions or need help understanding a concept from Chapter 15 Section 3, feel free to ask and I'll do my best to assist you.