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Mr. Jain -- 7th Grade Life Sciences



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Test #4 Questions (FINAL EXAM!)

TEST #4: Everything you should know in 8th grade Chemistry!

Multiple Choice
Identify the letter of the choice that best completes the statement or 
answers the question.

____	1.	What makes a chemical reaction EXOTHERMIC?
a.	heat is absorbed	c.	atoms are lost
b.	heat is released	d.	atoms are destroyed


____	2.	What makes a chemical reaction ENDOTHERMIC?
a.	heat is RELEASED.	c.	atoms are created
b.	heat is ABSORBED	d.	atoms are destroyed


____	3.	When NaOH and Al are placed in a test tube together, the test 
tube heats up.  WHAT IS TRUE ABOUT THIS REACTION?
a.	there are 3 reactants	c.	it is EXOTHERMIC
b.	there are 4 products	d.	it is ENDOTHERMIC


____	4.	When HCl and Al are put together in a test tube, hydrogen gas 
is made and the test tube heats up.  WHICH OF THE FOLLOWING STATEMENTS ARE 
TRUE?
a.	This is an EXOTHERMIC reaction	c.	There are no reactants
b.	This is an ENDOTHERMIC reaction	d.	HCL is hydro-ionic acid.


____	5.	Solids are made up of:
a.	repeating patterns of atoms and molecules	c.	liquid in a 
hyper-related, gyroscopic, quantum mechanically-induced state of near-zero 
gravity
b.	egg yolks	d.	the four elements only: air, fire, earth & 
water


____	6.	Following is what happened when we EXPLODED the HYDROGEN 
BALLOON:
H2 + O2 --> H2O.  A fireball was made!  WHAT IS TRUE ABOUT THIS REACTION?
a.	fire reacts with hydrogen gas	c.	it is exothermic
b.	fire reacts with oxygen gas	d.	hydrogen & oxygen are the 
products


____	7.	What are the molecules in a penny doing?
a.	the molecules are stuck together and not moving (only vibrating in 
place)	c.	the molecules are BOUNCING off of each other.
b.	the molecules are TUMBLING AROUND	d.	aqueous


____	8.	What does (l) mean?
a.	solid	c.	aqueous
b.	liquid	d.	gas


____	9.	In a chemical reaction, the starting (reactant) atoms 
rearrange to form products with:
a.	the same chemical properties	c.	different numbers of atoms
b.	different chemical properties	d.	a different atomic mass


____	10.	If the reactants in a chemical reaction weigh 54 grams, the 
products will be:
a.	more than 54 grams	c.	108 grams
b.	less than 54 grams	d.	exactly 54 grams!


____	11.	In the reaction CuCl2 + Al --> AlCl3 + Cu, WHAT are the 
PRODUCTS?
a.	aluminum + copper	c.	solid aluminum!
b.	copper chloride + aluminum	d.	AlCl3 and copper


____	12.	Atoms are neither created nor destroyed They are  
______________ in a chemical reaction.
a.	recreated	c.	refried
b.	rearranged	d.	do re me fa so la ti do


____	13.	If you start with 1 pound of flour and mix it 1 pound of 
water, the resulting dough weighs 2 pounds. This is an example of:
a.	how to cook delicious recipes	c.	The Law of Conservation of 
Matter
b.	The Law of How Atoms are Created and Destroyed	d.	an exothermic 
reaction.


____	14.	If you react 4 grams of hydrogen with 16 grams of Oxygen 
(Here is the chemical equation:, 2H2 + O2  2H2O), HOW MANY GRAMS OF water 
are produced?
a.	4	c.	18
b.	16	d.	20


____	15.	What does the LAW OF CONSERVATION OF MATTER state?
a.	you can't break the speed limit	c.	matter CANNOT be created NOR 
destroyed
b.	matter CAN be created, but CANNOT be destroyed	d.	What's the 
matter?


____	16.	What does the arrow mean in this equation?: 2H2 + O2  2H2O
a.	makes	c.	yields
b.	produces	d.	ALL OF THE ABOVE


____	17.	An instant-ice-pack is the example of WHAT TYPE of chemical 
reaction?
a.	exothermic	c.	protons
b.	endothermic	d.	neutrons


____	18.	What is the atomic mass of Helium (#2)?
a.	4	c.	16
b.	2	d.	I still don't know... I never study!


____	19.	What is an element?
a.	The smallest piece of water	c.	both a & b
b.	A pure substance that cannot be broken down into any simpler 
substances	d.	none of the above


____	20.	WHAT  2 ELEMENTS are there in this chemical equation: 2H2 + 
O2  2H2O
a.	boron	c.	hydrogen
b.	oxygen	d.	both b & c


____	21.	What are the PRODUCTS in this reaction?: 2H2 + O2  2H2O
a.	hydrogen	c.	both a & b
b.	oxygen	d.	water


____	22.	What is the most popular way of testing whether a chemical is 
an acid, base, or neutral?
a.	Pour it on your hand.	c.	Use litmus paper.
b.	Taste it.	d.	Smell it.


____	23.	What is USED UP in a chemical reaction?
a.	products	c.	two chemicals at a time
b.	yields	d.	reactants


____	24.	What is CREATED in a chemical reaction?
a.	reactants	c.	little green aliens
b.	products	d.	a vortex, into which polka-dotted dolphins 
are attracted.


____	25.	In the following chemical equation, what does the ARROW mean? 
2H2 + O2  2H2O
a.	makes	c.	yields
b.	produces	d.	ALL OF THE ABOVE!


____	26.	Which of the following is ALWAYS TRUE about chemical 
reactions?
a.	they are always exothermic	c.	atoms are rearranged
b.	they always start with 2 reactants	d.	the number of protons 
is increased


____	27.	How many NEUTRONS in one atom of ZINC?
a.	35	c.	30
b.	50	d.	I still don't know because I don't pay attention in 
class!


____	28.	How many NEUTRONS in one atom of ZIRCONIUM?
a.	35	c.	30
b.	51	d.	I still don't know because I don't pay attention in 
class!


____	29.	How many NEUTRONS in one atom of OXYGEN?
a.	I'll take a lifeline... phone a friend?	c.	8
b.	16	d.	I still don't know because I don't pay attention in 
class!


____	30.	What scale is used to measure how strong an ACID or a BASE is?
a.	gram scale	c.	pH scale
b.	atomic mass unites	d.	I still don't know because I don't 
pay attention in class!


____	31.	If litmus paper turns RED, this means the chemical being 
tested is:
a.	neither an acid nor a base (neutral)	c.	a base
b.	neutral	d.	an acid


____	32.	What is true about any substance that is has a CRYSTAL 
structure?
a.	There is a regularly repeating internal arrangement of its atoms.
	c.	It is made out of carbon bonded to oxygen.
b.	It is diamond-shaped.	d.	They have magical powers.


____	33.	What does the Law of Conservation of Matter state?
a.	atoms are neither CREATED nor DESTROYED	c.	tiny green Aliens 
infiltrate the classroom, strategically adding and subtracting mass
b.	atoms are REARRANGED in a chemical reaction	d.	BOTH A & B


____	34.	What does the "Pb" in Pb(NO3)2 stand for?
a.	Phosphorus	c.	Lead
b.	Boron	d.	Potassium Borate


____	35.	What is an indicator such as litmus paper used for?
a.	Testing for chlorine	c.	Testing for acidic, basic, or netural
b.	Testing for salt	d.	All of the above


____	36.	Table salt is sodium chloride. What elements make up sodium 
chloride? (NaCl)?
a.	sodium & chloride	c.	sodium & magnesium
b.	sodium & chlorine	d.	soda & sugar


____	37.	How many protons in one atom of HYDROGEN?
a.	1	c.	3
b.	2	d.	4


____	38.	How many protons in one atom of HELIUM?
a.	1	c.	3
b.	2	d.	4


____	39.	How many protons in one atom of LITHIUM?
a.	1	c.	3
b.	2	d.	4


____	40.	How many protons in one atom of BERYLLIUM
a.	1	c.	3
b.	2	d.	4


____	41.	What is the atomic MASS of Carbon-12?
a.	11	c.	13
b.	12	d.	14


____	42.	What is the atomic MASS of Carbon-14?
a.	11	c.	13
b.	12	d.	14


____	43.	How many PROTONS in one atom of CARBON-12?
a.	6	c.	7
b.	12	d.	14


____	44.	How many PROTONS in one atom of CARBON-14?
a.	6	c.	7
b.	12	d.	14


____	45.	How many ELECTRONS in one atom of CARBON-14?
a.	6	c.	7
b.	12	d.	14


____	46.	How many ELECTRONS in one atom of CARBON-12?
a.	6	c.	7
b.	12	d.	14


____	47.	What is the difference between one atom of Carbon-12 and one 
atom of Carbon-14?
a.	the number of NEUTRONS	c.	nothing, because they are both carbon
b.	the number of PROTONS	d.	both b & c


____	48.	Carbon-12 and Carbon-14 are:
a.	compounds	c.	isotopes
b.	metals	d.	man-made


____	49.	Why are water, air, earth, and fire 	NOT       elements?
a.	they can be broken down into simpler substances	c.	they can be 
broken down into simpler substances
b.	they can be broken down into simpler substances	d.	ALL OF THE 
ABOVE!


____	50.	What are the molecules in a helium balloon doing?
a.	the molecules are stuck together and not moving (only vibrating in 
place)	c.	the molecules are BOUNCING off of each other.
b.	the molecules are TUMBLING AROUND	d.	aqueous

 
TEST #4: Everything you should know in 8th grade Chemistry!
Answer Section

MULTIPLE CHOICE

	1.	B

	2.	B

	3.	C

	4.	A

	5.	A

	6.	C

	7.	A

	8.	B

	9.	B

	10.	D

	11.	D

	12.	B

	13.	C

	14.	D

	15.	C

	16.	D

	17.	B

	18.	A

	19.	B

	20.	D

	21.	D

	22.	C

	23.	D

	24.	B

	25.	D

	26.	C

	27.	A

	28.	B

	29.	C

	30.	C

	31.	D

	32.	A

	33.	D

	34.	C

	35.	C

	36.	B

	37.	A

	38.	B

	39.	C

	40.	D

	41.	B

	42.	D

	43.	A

	44.	A

	45.	A

	46.	A

	47.	A

	48.	C

	49.	D

	50.	C

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Last Modified: Tuesday, April 05, 2011
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