Chemistry

Which of these is not considered a pure substance? A) An atom B) A mixture C) An element D) A compound

B) A mixture

Which is an example of a chemical reaction? A) melting ice B) rusting iron C) water evaporating D) rubbing a marker on paper

B) rusting iron

Freezing point Where would you place this property in the Venn diagram?

Boiling Point, Density, Viscosity, and Conductivity

Which state of matter has the greatest distance between the individual particles? Solid, Liquid, or gas?

Gas

water freezing to form ice melting a gold chain to create a gold ring breaking a window into smaller pieces These may all be classified as

Physical Changes

Point your finger at the computer screen. Your finger is currently touching A) air. B) plasma. C) nothing. D) a vacuum.

air.

To find the density of an object you would use a graduated cylinder to find what characteristic of the object? A) length B) mass C) volume D) weight

C) volume

In going through the three physical states of matter, water would normally undergo changes in

density.

Water molecules are listed from A to B to C (Solid, Liquid, and Gas) in

least to greatest motion

A reaction that absorbs heat from the surroundings is known as a(n) A) exothermic reaction. B) endothermic reaction. C) displacement reaction. D) decomposition reaction.

endothermic reaction.

Density is defined as A) volume/mass B) mass/volume C) mass to length ratio D) length to mass ratio

B)mass/volume

boiling point density conductivity color These may all be classified as the ______________ of a substance.

B)physical properties

Justin Bleeber is conducting a calorimetry experiment in chemistry class. He fills an empty soda can with water and hangs it from an iron ring. The can hangs above a cracker that is resting on a stand. Justin uses his striker to light a Bunsen burner. He uses the flame from the Bunsen burner to light a wooden splint. The wooden splint is used to ignite the cracker. As the cracker burns it heats up the water in the soda can. Waves of gas are seen coming out of the top of the can. How many chemical changes did Justin observe?

3

0 (ice) 1.0928 0.9150 4 1.0000 1.000 20 1.0018 0.9982 40 1.0079 0.9922 60 1.0171 0.9832 80 1.0290 0.9718 Water changes density with changing temperature. At what temperature in Celsius does water have its smallest density value?

A) 0

BALANCE SCALE The object shown is used to measure A) mass. B) volume. C) density. D) temperature.

A) mass.

Which value is a measure of density? A) 5 m3 B) 6.8g cm3 C) 7.0 kg D) 10m s

B) 6.8g cm3

Sample A B C D Volume 100 cc 100 cc 100 cc 100 cc Mass 100 g 80 g 108 g 90 g Density 1 g/cc 0.8 g/cc 0.93 g/cc 0.9 g/cc According to the data from the experiment. Which density value is NOT correct?

B) Sample B

Which is a unit of density? A) cm3/g B) g/cm C) g/cm3 D) ml/g

C) g/cm3

You and your lab partner take two clear liquids and mix them together. When observing the final product, you notice a yellow solid has formed. What is the term for the solid that is formed as a result of a chemical change? A) condensate B) evaporate C) precipitate D) sublimate

C) precipitate

A 100 ml 100 g B 100 ml 80 g C 100 ml 108 g D 100 ml 90 g The table shows the masses of different samples of liquid. Which sample has the greatest DENSITY?

C) Sample C

pH Flammability Reactivity with other substances Electronegativity These may all be classified as ______________ of a substance.

C) chemical properties

Rusting metal is an example of a _________ change.

Chemical

Which of these can only be separated by chemical means and cannot be separated physically? A) An atom B) A mixture C) An element D) A compound

D) A compound

Which statement is true about your mass? A) You would have less mass on the moon. B) You would have less mass on the Earth. C) Your would have more mass on the Earth. D) You would have the same mass on the Earth and moon.

D) You would have the same mass on the Earth and moon.

Which is an example of a chemical reaction? A) Tearing up your last science test. B) Eating a TUMS to calm your upset stomach. C) Rubbing your hands together to warm them. D) Pouring water on a cut to wash off the germs.

Eating a TUMS to calm your upset stomach.

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?

Heat is given off.

Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The pack began to get icy cold and Carla applied the pack to Maria's ankle. What kind of reaction occurred in the cold pack? What evidence supports your answer?

It is a chemical change because heat energy is absorbed and the pack gets colder.

It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!" How would you respond to Roger?

Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.

Which of the images has the greatest attraction between the particles? Solid, liquid, or gas

Solid.

Which is a sign of a chemical change? A) Ice cream left at room temperature melts. B) Calcium chloride is dissolved in H2O and disappears. C) Paint on a freshly painted wall dries and is no longer sticky. D) When H2S gas is bubbled into a lead acetate solution, a precipitate forms.

When H2S gas is bubbled into a lead acetate solution, a precipitate forms.

Which is evidence that a chemical reaction has occurred? A) a phase change occurs B) a new gas is observed in the form of bubbles C) red and yellow paint mixing to make orange paint D) the temperature of the substance remains constant

a new gas is observed in the form of bubbles

Two cups of the same size are filled to the brim with clear liquids. Cup A holds water. Cup B contains alcohol. Your teacher challenges you to figure out which cup holds water. Because of your great science knowledge, you know that all substances have their own special properties. You and your lab partner add an ice cube to each cube. The ice floats in one liquid. You predict it is water. And the ice sinks in the other liquid. You predict that liquid is alcohol. What property of matter did you use to identify the liquids?

density

________ properties do not depend on the amount of material present.

intensive

Dry ice sublimes. It goes straight from a solid to a gas. What must happen to ice in order for this to occur?

it gains energy.

Which statement describes evidence of a chemical reaction? A) ice melting B) water boiling C) lighting a match D) grape juice freezing

lighting a match

Filtration is an example of a process that can be used to separate __________, but not __________.

mixtures; pure substances

During science lab, some students added small pieces of magnesium ribbon to 10 mL of hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared. Which is a sign that a chemical reaction has taken place in this experiment? A) change in odor B) change in color C) release of heat energy D) disappearance of magnesium

release of heat energy

The law of conservation of matter states that during a chemical reaction, the amount of matter

stays the same

100°C represents the temperature at which

water boils

The three main constituent minerals of granite stones are feldspar, mica, and quartz. The textures of different types of granite stones are shown in the picture. Based on the textures, it can be said that A) the proportion of mica in all the forms of granite is fixed. B) the proportion of quartz in all the forms of granite is fixed. C) the three minerals vary in proportion in each form of granite. D) the three minerals are in the same proportion in each form of granite.

the three minerals vary in proportion in each form of granite.

Which statement about a physical and chemical changes is true? A) A change in color often occurs during a chemical change. B) A change of state of matter always indicates a chemical change. C) If NO change in color is visible in a process, it must be a physical change. D) If NO change of state of matter occurs in a process, it must be a physical change.

A change in color often occurs during a chemical change.

Which of these would indicate a chemical change has occurred? A) Salt is dissolved into water. B) A child colors a picture with a crayon. C) Solid iron is heated until it turns into a liquid. D) A metal is added to an acid and hydrogen gas is formed

A metal is added to an acid and hydrogen gas is formed.

reactants → products Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products. A) The mass of the reactants equals the mass of the products. B) The mass of the reactants is less than the mass of the products. C) The mass of the reactants is greater than the mass of the products. D) The mass of the products is always greater than the mass of the reactants.

A) The mass of the reactants equals the mass of the products.

Step 1: Grind substance into a fine powder with a mortar and pestle. Step 2: Add the substance to a beaker containing 300 mL of water. Step 3: The mixture bubbles and a gas is emitted. The substance's ability to be ground into smaller pieces in step 1 would be classified in which area of the Venn diagram?

A) boiling point, density, viscosity, conductivity

Elements Density Aluminum 2.698 g/mL Calcium 1.54 g/mL Iron 7.8738 g/mL Silicon 2.3296 g/mL Sanjay is learning about the elements that make up Earth's crust. Ms. Richards, his Earth science teacher, gives him an element and asks him to determine which element from Earth's crust it is. She also provides Sanjay with this table. Sanjay weighs the element and finds that it has a mass of 17.98 g. By placing the element in water, he determines the volume of the substance to be 2.2835 mL. Based on the table from Ms. Richards, what element from Earth's crust did Ms. Richards gave to Sanjay?

A) iron

During science class, while studying mixtures, you mix together table salt and sand. You teacher challenges you to separate the salt from the sand. What property could you use and how would you use it? A) solubility; Add water to the mixture and dissolve the salt. B) density; The two will form two layers. Scoop out the top layer. C) color; Pick out one of the two solids by using color to guide you. D) particle size; Pour the mixture through a paper filter to separate the two.

A) solubility; Add water to the mixture and dissolve the salt.

A ring is submerged in a graduated cylinder originally filled with exactly 48.0 mL of water. Using the final reading of the graduated cylinder, find the volume of the ring. A) 0.6 mL B) 0.7 mL C) 3.0 mL D) 3.6 mL

A)0.6 mL

As matter changes state from gas to liquid, which of these statements is true? A) The particles speed up. B) The particles slow down. C) The particles get farther apart. D) The attractive force between the particles decreases.

B)The particles slow down.

A science teacher is explaining the arrangement of particles in the three states of matter using marbles. The teacher shows the class a glass container filled with marbles and explains that this represents the arrangement of particles in a solid. What would be the BEST way for the teacher to represent the arrangement of particles in a liquid? A) Put the marbles into a second container that is smaller than the original. B) Cover the container and shake it so the marbles move to different positions. C) Dump the marbles in the container onto a larger metal tray with raised sides. D) Invert the container and allow the marbles to roll across the floor and scatter

C) Dump the marbles in the container onto a larger metal tray with raised sides.

reactant → product If there are 2 grams of product produced by the chemical reaction, how many grams of reactant were consumed?

C)2 grams

Which piece of lab equipment has specific markings for highly accurate measurements of liquid volumes? A) beaker B) test tube C) watch glass D) graduated cylinder

D) graduated cylinder

In which situation are the individual molecules moving the fastest? A) in a bowl of hot soup B) in a glass of iced tea C) in a glass of tap water D) in a cup of boiling water

D) in a cup of boiling water

Which is a physical change? A) burning wood B) rusting metal C) cooking an egg D) freezing water

D)freezing water

Brad and Juan conducted several tests to determine the properties of silver metal. They noted that is was white, and conducted both electricity and heat. They computed the density to be 10.49 g/cm3. Silver did not react with water but in nitric acid, gas was released. What evidence supports a chemical change in the silver? A) Silver conducts electricity. B) Silver reacts with nitric acid to produce a gas. C) The color of silver at room temperature is white. D) Silver conducted heat and as the temperature increased, became more malleable.

Silver reacts with nitric acid to produce a gas.

One difference between mixtures and pure substances is that A) mixtures can be physically separated. B) mixtures are made of one type of atom. C) pure substances have no chemical bonds. D) pure substances can be physically separated.

mixtures can be physically separated.

Which of these BEST describes a physical change? A) fireworks explode B) rust forms on your bicycle C) a log in the campfire turns into ashes D) the amount of water in a pan decreases

the amount of water in a pan decreases