Science chapter 5

A mixture is made of two or more materials that A. cannot be separated by any means. B. cannot be separated by physical means. C. can only be separated by chemical means. D. can be separated by physical means.

C

Marcus has a piece of metal. He knows that the metal is either made of pure zinc or a mixture of zinc and iron. What property could he easily measure in the lab to help him determine whether the metal is pure zinc? A. shape B. boiling point C. solubility D. density

D

Megan left her bicycle outside on the patio while she went on vacation for several weeks. When she returned, Megan discovered a reddish substance, rust, on the handlebars of her bicycle. The rust is an example of a(n) __________. A. compound B. atom C. element D. mixture

D

Select the term that best completes the following statement: H2O, or water, contains one _____________. A. oxygen atom B. hydrogen atom C. element D. oxygen molecule

D

Which of the following substances can be separated into simpler substances only by chemical means? A. brass B. salt water C. granite D. water

D

Soil is best described as _______. A. a pure substance B. a mixture C. an element D. a compound

b

the state of being thick, sticky, and semifluid in consistency, due to internal friction.

viscosity

A liquid boils at 120°C until it all evaporates, leaving an empty container. What is most likely true about the liquid? A. The liquid was a mixture. B. The liquid had two freezing points C. The liquid contained water. D. The liquid was a pure substance.

B

What defines a mixture? A. It can be described by a single chemical formula. B. It cannot be broken down into simpler substances. C. It can be created through a chemical reaction. D. It can be broken down into its basic substances through physical means

B

Which of the following definitions characterizes an element? A. can be separated through physical means B. contains only one type of atom C. can only be broken down by chemical means D. contains a basic combination of two or more substances

B

Which of the following is an example of a mixture? A. calcium B. carbon dioxide C. water D. the atmosphere

B

Which of the following is an example of a mixture? hydrogen gas B. salt water C. sugar D. iron metal

B

The chemical formula of a particular substance is NO2. Which of the following is a correct description of the substance? A. a compound made up of 2 nitrogen atoms and 2 oxygen atoms B. an element made up of 2 nitrogen atoms and 2 oxygen atoms C. a compound made up of 1 nitrogen atom and 2 oxygen atoms D. an element made up of 1 nitrogen atom and 1 oxygen atom

A

Which of the following is a compound? A. Mg B. CO C. H D. Sn

A

Which of the following is true about a compound and its elements? A. The compound shares identical properties with one element, but all the other elements have different properties. B. The properties of a compound are different than the properties of its elements. C. The properties of a compound are the same as the properties of its elements. D. The elements all share identical properties, but their properties are different than the compound's properties.

A

NH3 is an example of A. an atom. B. an element. C. a compound. D. a mixture.

B

Sharon pours salt into a glass of water. The salt dissolves. The substance in the glass is a(n) __________. A. element B. mixture C. compound D. atom

B

The smallest part of a compound that still has the properties of that compound is a(n). A. molecule. B. mixture. C. nucleus. D. orbital.

B

Which of the following is true about mixtures and compounds? A. Mixtures and compounds are both made of two or more different substances. B. A mixture contains different substances that are not chemically combined with one another. C. A compound forms when different substances chemically combine to form a new substance. D. all of these

B

An individual with an excellent sense of smell is handed a bottle of perfume. After smelling the perfume, he reports that the perfume contains a predominant smell of roses with a faint touch of vanilla. If the perfume is made from water, rose essence, and a splash of vanilla, it is most likely A. an element. B. a gas. C. a mixture. D. a compound.

C

Harley mixes a cup of sugar and a cup of salt together inside a large bowl. The sugar and salt form a mixture and do not chemically combine. The solid grains in the mixture are made of tiny particles of matter. Which of the following conclusions can be made about these particles? A. The particles of salt in the salt grains are all identical. B. The salt particles are different from the sugar particles. C. The particles of sugar in the sugar grains are all identical. D. all of these

C

How many elements are found in the following chemical equation? K + Cl → KCl A. 3 B. 0 C. 2 D. 1

C

If a solid contains some particles that melt at 50°C and other particles that melt at 110°C, what must be true about the solid? A. The solid is a mixture. B. The solid is a pure substance. C. The solid is an element. D. The solid has three boiling points.

C

Jayla has two wires that are both made of pure copper. One of the wires is bigger than the other wire. Which of the following is true about the particles of the wires? A. The particles of the copper wires will have different densities. B. The large copper wire will have smaller particles than the small copper wire. C. The particles in both of the copper wires will be exactly the same. D. The large copper wire will have larger particles than the small copper wire.

C

Vince is baking a cake. He pours flour and sugar into an empty bowl. The substance in the bowl is a(n) __________. A. mixture B. element C. compound D. atom

C

What is the smallest particle of an element? A. mixture B. molecule C. atom D. compound

C

Which of the following is true about pure substances? A. A pure substance can always be separated by physical means. B. All pure substances are unable to be separated by any means. C. A pure substance can only be made up of one kind of atom. D. A pure substance has the same chemical properties throughout.

C

Which of the following is true for compounds? A. They can be created by chemical reactions. B. They can consist of no more than two types of elements. C. They all have the same properties regardless of their elemental composition. D. They can be separated into their component elements through physical means.

C

Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide? A. atom B. compound C. element D. mixture

C

The element oxygen, represented by the symbol O, is classified as a mixture. B. a pure substance. C. a compound. D. a solution.

C

Andre adds a spoonful of baking soda to a glass of vinegar. Bubbles begin to appear in the vinegar. The bubbles signal the formation of a(n) __________. A. element B. atom C. mixture D. compound

A

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen? A. Hydrogen is a compound made of two or more kinds of atoms. B. Hydrogen is an element made of two or more kinds of atoms. C. Hydrogen is an element made of only one kind of atom. D. Hydrogen is a compound made of only one kind of atom.

A

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe? A. liquid B. compound C. mixture D. element

A

The chemical combination of two or more different atoms in fixed amounts is called a(n) A. mixture. B. compound. C. element. D. orbit.

D

What defines a mixture? A. cannot be broken down into simpler substances B. created through a chemical reaction C. can be broken down into its basic substances through physical means D. described by a chemical formula

D

Which of the following statements is false? A. Two or more different substances combine physically to form a mixture. B. Two or more atoms combine chemically to form a molecule. C. Two or more different atoms combine chemically to form an element. D. Two or more elements combine chemically to form a compound.

D