Intro

Please note that this unit is not complete yet.



1.	A scientist who studies matter and its compositon is called a

	A. 	physicist.
	B. 	chemist.
	C. 	matterologist.
	D. 	meterologist.


 

 




2.	Which of the following would a chemist be least likely to study?

	A. 	The composition of matter.
	B. 	The separation and purification of matter.
	C. 	The forces acting on matter. 
	D. 	The energy invovled with changes in matter. 


 

 




3.	Which of the following would a chemist be most likely to study?

	A. 	The structure and composition of living things.
	B. 	The classification of microscopic organisms.
	C. 	The forces acting on matter. 
	D. 	The properties and behaviour of matter.


 

 




4.	An unknown sample has arrived at a lab.  Which of the following would a 

	chemist be least likely to study?
	A. 	The effect on microscopic organisms.
	B. 	The methods of separating the components.
	C. 	The melting points of any pure substances. 
	D. 	The behaviour of the sample in water.


 

 




5.	Any representation that conveys information about an object or an event 
	is called a

	A. 	model.
	B. 	hypothesis.
	C. 	conclusion.
	D. 	theory.
	E. 	inference


 

 




6.	Once scientists can account for past events and accurately predict future 
	ones, they present the explanation as a

	A. 	model.
	B. 	regularity.
	C. 	conclusion.
	D. 	theory.
	E. 	inference


 

 




7.	Developing a good theory usually requires

	A. 	the building of many models.
	B. 	a great deal of experimentation and the analysis of the results.
	C. 	a trial and error approach to science.
	D. 	intense experimentation over a short period of time in total secrecy.


 

 




8.	Which of the following is not true about the development of a scientific 
	theory.  Good theories....

	A. 	are based on the work of many scientists.
	B. 	usually evolve from minor changes to existing theories.
	C. 	result from the application of a model to a situation.
	D. 	are developed from observations and the regularities observed.


 

 




9.	Which of the following is not true about a scientific theory.  A theory....

	A. 	is based on a detailed process involving observation and inference.
	B. 	usually comes from the insight of a single individual.
	C. 	results from the modification of a previous model.
	D. 	is developed from classification process that uses observed regularities.


 

 




10.	A hypothesis is most similar to a(n)

	A. 	model.
	B. 	inference.
	C. 	conclusion.
	D. 	theory.
	E. 	classification system.


 

 




11.	A temporary explanation of an observed regularity is called a(n)

	A. 	model.
	B. 	inference.
	C. 	conclusion.
	D. 	hypothesis


 

 




12.	Adding current knowledge to information that is to be recorded from 
	direct observation, often confusing the observation, is an example of 

	A. 	using regularities to classify things.
	B. 	extending a model to predict unknown results.
	C. 	using a flowchart to identify outcomes or conclusions.
	D. 	an inference formed through interpretation.
	E. 	developing a hypothesis from a single experiment.


 

 




13.	An interpretation of an observation is called a(n)

	A. 	model.
	B. 	inference.
	C. 	conclusion.
	D. 	hypothesis


 

 




14.	In the scientific method, scientist would analyze these as they search 
	for any patterns or relationships.

	A. 	conclusions.
	B. 	observations.
	C. 	inferences. 
	D. 	theories.


 

 




15.	The definition of an hypothesis is

	A. 	an interpretation of an observation.
	B. 	an explanation that accounts for past events and accurately predicts future ones.
	C. 	a temporary explanation for an observed regularity.
	D. 	any representation intended to convey information about another event.


 

 




16.	In the scientific method, scientist use their senses to gather information.  
	The information recorded in this way would usually be in a form that can be 
	described as

	A. 	qualitative inferences.
	B. 	quantitative inferences.
	C. 	qualitative observations.
	D. 	quantitative observations.


 

 




17.	In the scientific method scientist extend their senses, by using laboratory 
	equipment, to gather information.  The information recorded in this way would 
	usually be in a form that can be described as

	A. 	qualitative inferences.
	B. 	quantitative inferences.
	C. 	qualitative observations.
	D. 	quantitative observations.


 

 




18.	Which of the following is not an example of a theory?

	A. 	The quantity of electron flow in a wire increases as the temperature of the wire decrease. 
	B. 	At a constant temperature, the volume of a gas decreases as the pressure increases.
	C. 	Water is a liquid at room temperature.
	D. 	Molecules move further apart when matter is heated.


 

 




19.	When a candle is burned, which of the following is clearly an observation?

	A. 	Carbon dioxide and water are produced.
	B. 	The wax combines with oxygen.
	C. 	The matter changes form. 
	D. 	There is an odour when the candle is blown out.


 

 




20.	When a candle is burned, which of the following is clearly an inference?

	A. 	The wax changes form.
	B. 	The mass and volume of solid wax is reduced.
	C. 	Heat is felt. 
	D. 	There is an odour when the candle is blown out.


 

 




21.	A student places a pennie into a concentrated solution of nitric acid 
	and records the following.  Which of the statements is clearly an inference?

	A. 	The solution bubbles.
	B. 	Cu2+ ions are produced.
	C. 	The beaker gets warm. 
	D. 	A red-brown gas is produced.


 

 




22.	A student places a pennie into a concentrated solution of nitric acid 
	and records the following.  Which of the statements is clearly an inference?

	A. 	The solution bubbles.
	B. 	A green-blue color is produced in the liquid phase.
	C. 	The reaction is exothermic. 
	D. 	A red-brown gas is produced.


 

 




23.	A student mixes two white solids in a beaker, which is sitting in a small 
	pool of water on a block of wood, and records the following.  Which of the 
	statements is clearly an inference?

	A. 	The temperature of the mixture drops.
	B. 	An odour is released.
	C. 	The mixture gets slushy. 
	D. 	The endothermic reaction freezes the beaker to the wood`.


 

 




24.	A student mixes two white solids in a beaker, which is sitting in a small 
	pool of water on a block of wood, and records the following.  Which of the 
	statements is clearly an inference?

	A. 	The temperature of the mixture drops.
	B. 	Ammonia gas is released.
	C. 	The mixture gets slushy. 
	D. 	The beaker sticks to the wood`.


 

 




25.	A student mixes two white solids in a beaker, which is sitting in a small pool 
	of water on a block of wood, and records the following.  Which of the statements 
	is clearly an inference?

	A. 	The reaction absorbs energy from the water.
	B. 	The outside of the beaker becomes frosted.
	C. 	The mixture gets slushy. 
	D. 	The beaker sticks to the wood`.


 

 




26.	In a demonstration, a teacher pours 50.0 mL of sulfuric acid into 100.0 mL of water.  
	A student recorded the following.  Which of the statements is clearly not an observation?

	A. 	The temperature of the solution rises 6 °C.
	B. 	The inside of the beaker becomes coated with condensate.
	C. 	Heat energy is released in an exothermic reaction. 
	D. 	Bubbles form in the liquid.


 

 




27.	Which of the following is an observation?

	A. 	Water boils at 100 °C.
	B. 	Particles move faster when heated.
	C. 	Matter cannot be created.
	D. 	Atoms are composed of protons and neutrons.


 

 




28.	A student places a penny into a concentrated solution of nitric acid and 
	records the following.  Which of the statements is clearly an inference?

	A. 	The pennie gets smaller as the reaction proceeds.
	B. 	A green-blue color is produced in the liquid phase.
	C. 	The temperature of the solution rises. 
	D. 	A poisonous red-brown gas is produced.


 

 






Section 2



1.	"The total mass of the products equals the total mass of the reactants" is 
	a statement of the law of

	A. 	multiple proportions.
	B. 	definite proportions.
	C. 	conservation of energy.
	D. 	conservation of mass.


 

 




2.	It is found that 14 g of lithium reacts with oxygen gas to produce 46 g of 
	lithium oxide. The mass of oxygen gas used in the reaction

	A. 	can only be determined with a better lab procedure. 
	B. 	is 14 g.
	C. 	is 16 g.
	D. 	is 32 g.
	E. 	is 46 g.


 

 




3.	The Law of Definite Proportions refers to

	A. 	compounds only
	B. 	compounds and mixtures
	C. 	solutions and compounds
	D. 	mixtures only
	E. 	elements


 

 




4.	When 6 grams of carbon burn in 16 grams of oxygen, 22 grams of carbon dioxide 
	is formed.  If the reaction is changed so that 6 grams of carbon burns in 32 
	grams of oxygen, the mass of carbon dioxide would be

	A. 	22 g.
	B. 	26 g. 
	C. 	28 g.
	D. 	38 g.


 

 




5.	When 4 grams of hydrogen burns in 32 grams of oxygen, 36 grams of water is 
	formed.  If the reaction is changed so that 12 grams of hydrogen burns in 
	32 grams of oxygen, the mass of water would be

	A. 	108 g.
	B. 	44 g. 
	C. 	40 g.
	D. 	36 g.


 

 




6.	When 4 grams of hydrogen burns in 32 grams of oxygen, 36 grams of water is 
	formed.  If the reaction is changed so that 8 grams of hydrogen burns in 
	64 grams of oxygen, the mass of water would be

	A. 	108 g.
	B. 	72 g. 
	C. 	64 g.
	D. 	36 g.


 

 




7.	The best way to separate the components of the compound silver iodide 
	would be the use of

	A. 	filtration.
	B. 	centrifuge.
	C. 	chromatography.
	D. 	distillation.
	E. 	electrolysis.


 

 




8.	Given the following temperature-time graph for Substance "X", the 
	boiling point of substance "X" is closest to:




	Sorry, picture missing






	A. 	0°C
	B. 	25°C
	C. 	40°C
	D. 	55°C
	E. 	60°C


 

 




9.	Given the following temperature-time graph, which one of the following 
	statements is true?




	Sorry, picture missing




	A. 	During section "A", both solid and liquid are present.
	B. 	During section "B", energy is being used primarily for melting.
	C. 	During section "C", liquid, solid and gas are present.
	D. 	During section "D", there is only plasma.
	E. 	Section "B" represents boiling.


 

 




10.	Which pair of phase changes BOTH absorb heat?

	A. 	condensation and freezing.
	B. 	condensation and melting.
	C. 	evaporation and freezing.
	D. 	evaporation and melting.


 

 




11.	The melting point of gallium is 29.8°C and its boiling point is 2403°C. 
	On a hot day (35°C) a sample of gallium would be

	A. 	gaseous.
	B. 	solid.
	C. 	liquid.
	D. 	plasma


 

 




12.	Solids can best be described as having a(n)

	A. 	definite shape and a definite volume.
	B. 	definite shape and an indefinite volume.
	C. 	indefinite shape and a definite volume.
	D. 	indefinite shape and an indefinite volume.


 

 




13.	Liquids can best be described as having a(n)

	A. 	definite shape and a definite volume.
	B. 	definite shape and an indefinite volume.
	C. 	indefinite shape and a definite volume.
	D. 	indefinite shape and an indefinite volume.


 

 




14.	A pure substance that can be decomposed by a chemical change is called a(n)

	A. 	solution.
	B. 	suspension.
	C. 	element.
	D. 	compound.


 

 




15.	Components are chemically united in

	A. 	a mixture.
	B. 	a compound.
	C. 	an element.
	D. 	a suspension.


 

 




16.	The rusting of iron is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	phase change


 

 




17.	The melting of iron is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




18.	The evaporation of water is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




19.	The sublimation of carbon dioxide is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




20.	The melting of ice is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




21.	The composting of grass is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




22.	The ripening of a banana is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




23.	The rotting of head of lettuce is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




24.	The electrolysis of water is an example of a

	A. 	chemical change
	B. 	physical change
	C. 	dissociation change
	D. 	nuclear change


 

 




25.	Which of the following does not involve a chemical change?

	A. 	cube of sugar in hot coffee
	B. 	tarnishing silver
	C. 	exploding dynamite
	D. 	burning fire


 

 




26.	Which of the following is not a physical change?

	A. 	decomposition of water
	B. 	iodine subliming
	C. 	dew condensing
	D. 	mercury evaporating


 

 




27.	Which of the following is not a physical change?

	A. 	boiling
	B. 	freezing
	C. 	burning
	D. 	melting


 

 




28.	Which of the following is not a physical change?

	A. 	grinding
	B. 	decomposition
	C. 	tearing 
	D. 	mixing


 

 




29.	Which of the following is an example of a physical change?

	A. 	leaves changing colour
	B. 	iodine subliming
	C. 	paper burning
	D. 	water decomposing


 

 




30.	A process that does not produce new kinds of matter is

	A. 	electrolysis
	B. 	decomposition
	C. 	distillation
	D. 	burning


 

 




31.	How is a physical change different from a chemical change?

	A. 	A physical change results in new chemicals being formed and a chemical change does not.
	B. 	A chemical change results in new chemicals being formed and a physical change does not.
	C. 	A physical change is reversible and a chemical change is not reversible.
	D. 	A chemical change is reversible and a physical change is not reversible.


 

 




32.	Which of the following is characteristic of a pure substance?

	A. 	They are solutions.
	B. 	They are composed of one element.
	C. 	They are mixtures.
	D. 	They have a constant boiling point.


 

 




33.	A clear, homogeneous liquid is heated until bubbling starts. As it is 
	being heated, a white residue collects around the outside of the evaporating 
	dish. The original liquid can best be classified as

	A. 	a solution.
	B. 	a suspension.
	C. 	a pure substance.
	D. 	an element.
	E. 	heterogeneous.


 

 




34.	Anything that has mass and occupies space is called

	A. 	mixture
	B. 	matter
	C. 	substance
	D. 	element


 

 




35.	Two or more kinds of matter with separate identities is a

	A. 	mixture
	B. 	solution
	C. 	substance
	D. 	compound


 

 




36.	Matter that is easily separated by physical means is a(n)

	A. 	compound
	B. 	element
	C. 	substance
	D. 	mixture


 

 




37.	Matter that is pure and possesses a unique set of properties is a

	A. 	suspension
	B. 	solution
	C. 	substance
	D. 	mixture


 

 




38.	Matter that cannot be separated by physical means is a

	A. 	compound
	B. 	solution
	C. 	suspension
	D. 	mixture


 

 




39.	Matter that cannot be separated by chemical or physical means is a(n)

	A. 	compound
	B. 	solution
	C. 	element
	D. 	substance


 

 




40.	Matter that cannot be broken down into a more simple form is a(n)

	A. 	compound
	B. 	solution
	C. 	element
	D. 	substance


 

 




41.	When water is mixed with another substance, and the mixture will 
	not scatter light, the mixture is a

	A. 	compound
	B. 	solution
	C. 	suspension
	D. 	substrate


 

 




42.	Which of the following is not an example of a substance?

	A. 	copper
	B. 	sodium chloride
	C. 	air
	D. 	water
	E. 	sugar


 

 




43.	Water is an example of a(n)

	A. 	compound
	B. 	solution
	C. 	element
	D. 	homogeneous mixture


 

 




44.	Salt water is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




45.	Salt is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




46.	Air is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




47.	Muddy river water is an example of a

	A. 	compound
	B. 	suspension
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




48.	The alloy brass is an example of a

	A. 	compound
	B. 	suspension
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




49.	Sugar is an example of a

	A. 	compound
	B. 	solution
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




50.	Chlorine is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




51.	Nitrogen is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




52.	Potassium oxide is an example of a(n)

	A. 	compound
	B. 	element
	C. 	heterogeneous mixture
	D. 	homogeneous mixture


 

 




53.	An example of a pure substance is

	A. 	salt water.
	B. 	household ammonia.
	C. 	copper.
	D. 	tap water.


 

 




54.	Which of the following is an element?

	A. 	water
	B. 	air
	C. 	salt
	D. 	potassium


 

 




55.	Which of the following is not a mixture?

	A. 	air
	B. 	brass
	C. 	salt
	D. 	milk


 

 




56.	A cloudy liquid will not let a laser beam pass through it. Therefore, 
	it must be classified as

	A. 	a compound
	B. 	an element
	C. 	homogeneous
	D. 	heterogeneous
	E. 	a solution


 

 




57.	Matter is anything that occupies space and has

	A. 	colour.
	B. 	odor.
	C. 	definite shape.
	D. 	mass.


 

 




58.	All mixtures _______.

	A. 	are easy to separate
	B. 	are composed of parts with different identities.
	C. 	have a constant boiling point
	D. 	can be separated by distillation


 

 




59.	Matter that has the same property and composition throughout is called

	A. 	a liquid.
	B. 	a solid.
	C. 	homogeneous.
	D. 	heterogeneous.


 

 




60.	A material is  a homogeneous brown gas that has a fixed percentage composition.  
	It is separable into simpler substances by means of a chemical reaction, but not 
	by any physical means.  The material can best be described as a

	A. 	mixture of compounds.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture of elements.


 

 




61.	A material is  a brown solution that is separable into simpler substances by 
	physical means.  The material can best be described as a

	A. 	heterogeneous mixture of compounds.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




62.	A material is  a brown liquid that is not separable into simpler substances by 
	physical or chemical means.  The material can best be described as a

	A. 	heterogeneous mixture of compounds.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




63.	A material is  a brown and white solid that is separable into simpler 
	substances by putting the material in water.  The brown part sinks while 
	the white part floats. The material can best be described as a

	A. 	heterogeneous mixture.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




64.	A material is  a clear liquid with white solid bits suspended in it 
	and lying on the bottom of the container. It is separable into simpler 
	substances with gentle heating.  The white part remains while the clear 
	part evaporates. The material can best be described as a

	A. 	heterogeneous mixture.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 



65.	A material is  a clear liquid.  It separates into simpler substances 
	with gentle heating.  A clear part evaporates while a white part remains 
	in the beaker.  The material can best be described as a

	A. 	heterogeneous mixture.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




66.	A material is  a clear liquid.  It does not separate into simpler 
	substances with gentle heating or by chemical means.  The clear liquid 
	only evaporates when heated.  The material can best be described as a

	A. 	heterogeneous mixture.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




67.	A material is  a clear liquid.  It does not separate into simpler substances 
	with gentle heating; it only evaporates. When electrolysis is used, two gases
	are produced. The material can best be described as a

	A. 	heterogeneous mixture.
	B. 	substance which is an element.
	C. 	substance which is a compound.
	D. 	homogeneous mixture.


 

 




68.	At STP, a sample is a homogeneous brown gas with a fixed percentage composition.  
	It is separable into simpler substances by means of a chemical reaction, but not 
	by dissolving, chromatography, or any other physical change.  The sample can best 
	be described as a:

	A. 	pure substance which is a compound.
	B. 	pure substance which is an element.
	C. 	mixture of compounds.
	D. 	pure substance which is a colloid.
	E. 	solution of elements.


 

 




69.	A sample has a melting point of -39°C and a boiling point of 357°C.  	
	It has a fixed composition and cannot be separated into simpler component 
	substances by physical means.  It conducts electricity and is neither transparent 
	nor translucent.  At room temperature, the sample can best be described as:

	A. 	a pure substance in the liquid state.
	B. 	a mixture in the liquid state.
	C. 	a pure substance in the solid state.
	D. 	a mixture in the solid state.
	E. 	a pure substance in the gaseous state.


 

 




70.	A water solution of table salt (NaCl) is a
	A. 	heterogeneous compound.
	B. 	homogeneous compound.
	C. 	heterogeneous mixture.
	D. 	homogeneous mixture.


 

 




71.	A substance has a melting point  of 49°C and a boiling point of 457°C. 
	It has a fixed composition and cannot be separated into simpler component 
	substances by physical means.  It conducts electricity and is not transparent 
	or translucent.  At room temperature, the substance can best be described as

	A. 	a pure substance in the liquid state.
	B. 	a mixture in the liquid state.
	C. 	a pure substance in the solid state.
	D. 	a mixture in the solid state.
	E. 	a pure substance in the gaseous state.


 

 




72.	Ammonia (NH3) can be classified as:

	A. 	a compound
	B. 	an element
	C. 	a homogeneous mixture
	D. 	a heterogeneous compound
	E. 	Both "A" and "C" are correct.