Chemistry Quiz 4-2-19

The mass of a length of metal wire is 45g. When the wire is placed in the graduated cylinder with water, it displaces 5 mL of water. What is the density of the metal?

9 g/cm^3

A water molecule is made up of one oxygen and two hydrogen atoms. Why is water considered a pure substance? A. Each water molecule is identical. B. Water can be broken down by physical means. C. Water molecules are made up of different types of atoms. D. Water can be combined with other substances by physical means.

A

All of these statements about elements, atoms, and compounds are true except _____. A. compounds are smaller than atoms B. atoms cannot be broken down into smaller substances C. elements and compounds form the basis of all materials on Earth D. elements consist of one type of atom and can combine to form compounds

A

Which of these is a way in which elements and compounds are similar? A. Elements and compounds are both pure substances. B. Elements and compounds are both listed on the periodic table. C. Elements and compounds are both made up of different kinds of atoms. D. Elements and compounds can both be broken down by physical changes.

A

Which of these is the smallest particle to retain the properties of an element? A. an atom B. a proton C. a molecule D. an electron

A

Which of these substances is likely to be formed of particles with a repeating crystalline structure? A. salt B. glass C. honey D. nitrogen

A

mass

A measure of the amount of matter in an object. Objects made up of more matter have more mass.

What is the chemical symbol for Silver?

Ag

What is the chemical symbol for Aluminum?

Al

periodic table

An arrangement of all the known elements in order of their atomic number. The periodic table also organizes the elements based on their properties.

matter

Anything that has mass and takes up space. Both living and nonliving things are matter.

What is the chemical symbol for Gold?

Au

Which mineral has the greatest density? A. feldspar (mass: 16 g volume: 6.2 mL) B. galena (mass: 9 g volume: 1.2 mL) C. garnet (mass: 12 g volume: 3.0 mL) D. quartz (mass: 10 g volume: 3.7 mL)

B

Diamond is a covalently bonded network solid that is made up of carbon atoms arranged in a way that gives diamonds their hardness. Which of these characteristics do diamonds share with all network solids? A. low melting point B. rarity and high cost C. orderly crystal structure D. made up of carbon atoms

C

Each element has a unique name. How else can an element be represented? A. by its mass B. by its state of matter C. by its chemical symbol D. by an identification number

C

What is the chemical symbol for Carbon?

C

Which type of substance is always made up of two or more different types of atoms joined by chemical bonds? A. mixture B. element C. compound D. pure substance

C

What is the chemical symbol for Chlorine?

Cl

What is the chemical symbol for Copper?

Cu

What makes physical properties different from chemical properties? A. Physical properties relate to elements rather than compounds. B. Physical properties appear only after a chemical change occurs. C. Physical properties describe elements in the solid state rather than in the liquid or gas state. D. Physical properties can be observed without attempting to change the identity of the substance.

D

Which of the following describes objects that are formed of molecules very close together with little room to move or are made up of molecules with repeating crystalline patterns? A. colloid B. gas C. liquid D. solid

D

Which statement describes a chemical property of an object? A. The object is white in color. B. The object has a powdery texture. C. The object's density is 2.11 g/cm 3 . D. The object reacts with acid to form water.

D

Which statement describes a chemical property? A. A particular substance evaporates at 30 °C. B. A 2 ft. long metal bar has a mass of only 176 g. C. A certain heavy metal turns to a liquid at room temperature. D. A metal is added to a beaker of water, and the beaker explodes.

D

What is the chemical symbol for Helium?

He

What is the first element of the periodic table? What's special about it?

Hydrogen (H) It doesn't perfectly fit in with any other groups. It has the smallest atomic weight.

What do models of molecules and extended structures show?

Molecular shapes and structures, chemical bonds between atoms (for 2D models), and the different atoms in compounds.

What is the chemical symbol for Sodium?

Na

What are the elements in column 18 of the periodic table?

Noble gases (In our worksheet, they were colored orange.)

What is the chemical symbol for Silicon?

Si

If several liquids are layered in a graduated cylinder, how can you tell which is the densest?

The least dense liquids are on the bottom. The liquids lower in the tube have more mass per unit volume than the liquids in the upper part of the tube.

What are the noble gases?

The least reactive elements. Hydrogen (H), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn), Ununoctium (Uuo)

If several liquids are layered in a graduated cylinder, how can you tell which is the densest?

The most dense liquids are on the bottom. The liquids lower in the tube have more mass per unit volume than the liquids in the upper part of the tube.

How can two samples behave and look differently if they are both only made up of one element?

The two substances have a different number of atoms -- for example, one may have more -- and their atomic structures are different.

How can two samples behave and look differently if they are both only made up of the same element?

The two substances have a different number of atoms -- for example, one may have more -- and their atomic structures are different.

What are the elements within the groups 5-12?

Transition Metals (In our worksheet, they were colored brown.)

Can both plain molecules and compounds be pure substances?

Yes Pure substance - a sample of matter that has specific chemical and physical properties

If you have two samples of the same element (ex. mercury) that are different sizes, will they have the same melting point? Why or why not?

Yes, because the chemical identity is still the same (both are the same element, regardless of size), and thus will react the same way and have the same properties.

What is a "group" on the periodic table?

a column (vertical)

volume

a measure of the amount of space an object takes up

weight

a measure of the gravitational force on an object

What is a physical property?

a property that can be observed without changing the identity of the substance (ex: mass, volume, density, state, shape, color, size)

compound

a pure substance made up of two or more different types of atoms joined by chemical bonds

pure substance

a sample of matter that has specific chemical and physical properties, such as appearance, melting point, and reactivity

crystal

a substance in which the particles are arranged in an orderly geometric, and repeating pattern

element

a substance that cannot be separated or broken down into simpler substances by chemical means

What is a chemical property?

a substance's ability to change into a new substance with different properties.

Which of the following components of air is a compound? a. carbon dioxide b. oxygen c. nitrogen d. argon

a. carbon dioxide

On our periodic table worksheet, the ________ series was circled in yellow.

actinide

What is the first group of the periodic table?

alkali metals (the most reactive) (In our worksheet, they were colored red.)

What is the second group of the periodic table?

alkali-earth metals (second most reactive) (In our worksheet, they were colored purple.)

What is the second group of the periodic table?

alkaline-earth metals (second most reactive) (In our worksheet, they were colored purple.)

A pure substance is a material that ___________ be physically separated into its parts

cannot

luster

describes how light reflects and interacts with a substance

Is this an element, [element] molecule, or [molecule] compound? "Cl"

element

Is this an element, [element] molecule, or [molecule] compound? "Cl(2)" (2) represents subscript

element molecule

What state of matter is described? "changing shape and volume"

gas

What is the 17th group on the periodic table?

halogens (most reactive nonmetals) (In our worksheet, they were colored green.)

On our periodic table worksheet, the ________ series was circled in red.

lanthanide

What state of matter is described? "definite volume, changing shape"

liquid

What, on our periodic table worksheet, did we outline in blue?

liquids at room temperature Mercury (Hg), Bromine (Br)

What, on our periodic table worksheet, did we outline in purple?

metalloids (have the properties of both metals and non-metals) Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te)

Is this an element, [element] molecule, or [molecule] compound? "CO"

molecule compound

Is this an element, [element] molecule, or [molecule] compound? "H(2)O" (2) represents subscript

molecule compound

What state of matter is described? "definite shape and volume"

solid

The atomic number of an element is based on the ___________________.

structure of its atoms

chemical bond

the attractive force that holds atoms together

density

the ratio of the mass of a substance to its volume d = m/v (density = mass divided by volume)

atom

the smallest unit of an element that has the chemical identity of that element. Atoms of the same elements have the same chemical properties and behave similarly.

How is it possible that both diamonds and graphite can be made of pure carbon?

the structure (arrangement) of the atoms and the number of atoms differ

Which of these are physical properties? -thermal conductivity -flammability -magnetic attraction -melting point -reactivity with oxygen

thermal conductivity, magnetic attraction, melting point

molecule

two or more atoms held together by chemical bonds

If you are not able to measure the volume of an object using a ruler (or similar tool), what is another method?

water displacement