6th Grade Science Mid-Term Exam Review
A digital thermometer shows the temperature as 21.2°C. The thermometer is precise to the nearest______.
0.1°
What is the freezing point of water on the Celsius temperature scale?
0°C
What is one way scientific theories and scientific laws are different?
A theory is an attempt to explain the pattern to where a law is a rule or statement of a pattern.
____ has mass and takes up space.
Air
Use the example of inflating a flat tire after a repair to explain why air is matter.
Air takes up space and fills the tire.
Which of these statements about matter is NOT true?
During chemical changes, matter is destroyed.
The study of non-living things such as rocks, soil, and planets is called _______________________.
Earth Science
Which one of the following statements describes the flow of heat?
Energy moves from a warmer object to a cooler object
Who discovered the nucleus and protons?
Ernest Rutherford
True/False A line graph shows the relationship between three variables.
FALSE
True/False The ability of a measurement to be reproduced with the same result is a sign of precision.
FALSE
True/False The mass of an object can vary with the object's location.
FALSE
True/False A hypothesis is a decision based on the results of the experiment.
FALSE
True/False An atom that gains an electron is positively charged.
FALSE
True/False During energy transformations, sometimes energy is destroyed.
FALSE
True/False For an atom to be neutral, the number of protons must equal the number of neutrons.
FALSE
True/False If it takes more than a few experiments to find the answer to a particular problem, it means that the scientist has failed and is not a very good researcher.
FALSE
True/False If the results of a study do not support a hypothesis, it means that the experiment failed.
FALSE
True/False It is always okay to smell or sniff the chemical you are using in your experiment.
FALSE
True/False Once a scientific theory has been created, it cannot be changed.
FALSE
True/False Only professional scientists use the scientific method.
FALSE
True/False The greater the average kinetic energy of an object, the lower the temperature of that object.
FALSE
True/False When a substance burns, matter is destroyed.
FALSE
True/False If false, change the identified word or phrase to make the statement true. You *cannot* classify matter based on chemical properties.
FALSE; can
True/False If false, change the identified word or phrase to make the statement true. The ability to react with oxygen is a *physical* property.
FALSE; chemical
True/False If false, change the identified word or phrase to make the statement true. When a substance undergoes a chemical change, its identity *does not* change.
FALSE; does
True/False If false, change the identified word or phrase to make the statement true. Copper is used for wires because it is ductile. This is a *chemical* property.
FALSE; physical
True/False If false, change the identified word or phrase to make the statement true. Shape is a *chemical* property.
FALSE; physical
True/False If false, change the identified word or phrase to make the statement true. The density of a kilogram of iron is *less than* the density of 1 gram of iron.
FALSE; same
True/False If false, change the identified word or phrase to make the statement true. Matter is made up of *motionless* particles.
FALSE; vibrating, moving
The __________________________ temperature scale is used mainly in the United States.
Fahrenheit (°F)
Oxygen gas normally exists as O2 molecules. Each molecule contains two oxygen atoms. Is O2 a compound? Explain your answer.
No, a compound contains atoms of more than one element.
Suppose you found a sample of an element with the following properties: it is a dull, yellow solid at room temperature, which easily breaks when dropped or hit with a hammer. Is the element a metal, nonmetal, or metalloid? Where on the periodic table might you find the element?
Non-metal; You might find the element at the far right of the periodic table.
Calcium has five naturally occurring isotopes: Ca-40, Ca-42, Ca-43, Ca-44, and Ca-46. Which isotope of calcium is the most common? Explain your answer.
The average atomic mass (20) is closest to Ca-40. So it is the most common isotope.
You need to paint iron lawn furniture that has been left outside. What property of iron makes this necessary? If the paint is chipped, what happens?
The chemical property makes it necessary because it reacts with oxygen; If the paint is chipped it rusts.
Look at Chapter 6, Figure 6-1 in your notes. What would happen to the car's kinetic energy as it moved from point A to point B?
The kinetic energy increases
Magnesium has 3 naturally occurring isotopes - Mg-24, Mg-25, and Mg-26. Draw a table listing the number of protons and neutrons found in each isotope. Please label.
_Mg-24_____Mg-25____Mg-26 12 Protons . . 12 Protons . . 12 protons 12 Protons . . 13 Protons . . 14 protons
An example of a chemical property is ____.
ability to react with oxygen
A basketball player hits 99/100 free throws. His shots would be considered____.
accurate and precise
Which one of the following is NOT a good conductor of heat?
air
A negatively charged ion is a(n) __________________________.
anion
Another term for technology is ____.
applied science
All matter is made up of particles called ____________________.
atoms
When silver metal comes in contact with sulfur, silver sulfide forms and the silver appears darker. This is a ____.
chemical change
Titanium reacts less with oxygen than most metals do. This is a ____.
chemical property
Physical science is broken down into physics and ______________________________.
chemistry
What physical property do water, plastic wrap, diamonds, and air have in common?
clear
A cubic centimeter can be expressed as ____.
cm3
Reason why the handle of a spoon can get hot when only its bottom part is in a pot of hot water
conduction
You burn your hand by grabbing a spoon that has been sitting in hot coffee.
conduction
Gasoline igniting is an example of the property of ____.
flammability
An example of a chemical change is ____.
frying a hamburger
You take a cookie sheet out of the oven and place it on the counter. When you remove the cookie sheet, the counter is warm.
conduction
A variable in an experiment that stays the same is a(n) ____.
constant
Energy moves through ocean currents by __________________________.
convection
The air near the ceiling of the room is warmer.
convection
Thermals in the air are due to this.
convection
The law of conservation of matter states that matter is neither _____________________ nor _____________________ - it only changes form.
created nor destroyed
Which of the following causes a sugar cube to only change physically, not chemically?
crushing the sugar cube and dissolving it in water
Which of the following is the negatively charged subatomic particle?
electron
Physics is the study of____.
energy
What can you use to check that a measurement is reasonable?
estimation
In general, nonmetals are ____.
gases at room temperature
In general, metals are ____.
good conductors of heat
The mass of an apple would be measured in ____________________.
grams
Energy occurs in ____.
many forms
The _____ of an object measures the amount of matter in that object.
mass
Density depends on ____.
mass and volume
Would your mass be different on the Moon than on Earth? Would your weight?
mass is the same; weight is different
Chemistry is the study of____.
matter
Elements that have properties halfway between those of metals and nonmetals, are classified as _________________________.
metalloids
All ____ except mercury are solids at room temperature.
metals
Elements on the left side of the periodic table are classified as ______________________.
metals
length of a soccer field
meter
Which of the following subatomic particles does not have a charge?
neutron
Chlorine-35 and Chlorine-37 have a different number of ________________________.
neutrons
Most of the mass of an atom is found in its ____.
nucleus
Water (H2O) and hydrogen peroxide (H2O2) have different properties because ____.
one contains a greater percentage of oxygen than the other
Scientists must be impartial and not base their conclusions on ____.
opinions
Which of the following is NOT an SI unit?
ounce
Classify the following as either a physical change or chemical change. a dish of ice cream is left out and melts
physical
Classify the following as either a physical change or chemical change. an egg breaks
physical
Classify the following as either a physical change or chemical change. breaking a sheet of glass
physical
Classify the following as either a physical change or chemical change. butter hardens after being in the refrigerator
physical
Classify the following as either a physical change or chemical change. melting solid gold
physical
Classify the following as either a physical change or chemical change. scratching a silver teaspoon
physical
Mass is a(n) ____ property.
physical
How does the energy of the particles differ in solids, liquids, and gases?
solid-slow; liquid-medium; gas-fast
A collection of structures, cycles, and processes that relate to and interact with each other is called a _________________________.
system
Data displayed in rows and columns is called a(n)____.
table
A camera is an example of ____.
technology
Celsius scale measures this
temperature
The measure of the average kinetic energy of the particles in an object
temperature
In which of the following situations would it NOT be wise to estimate?
the amount of medicine to give a patient
A physical change occurs when ____.
the appearance of a substance changes but its identity does not
127 mg = _____ g
0.127
__________ describes the world using numbers.
Measurement
When a peeled banana turns black, it is a ____.
chemical change
List the 5 steps of the Scientific Method in order.
1) Purpose 2) Hypothesis 3) Experiment 4) Analysis 5) Conclusion
Explain the ways energy moves when an ice cube is set on a sidewalk on a sunny day.
1) radiation from the sun moves to the ice cube and to the sidewalk 2) conduction from the sidewalk moves to the ice cube
A chemical that you are using in the lab has the safety symbol for fume. Which of the following precautions should you take?
1) use a fume hood 2) wear a face mask 3) wear goggles
One second would be equal to_____ milliseconds.
1,000
SI units are useful because they are all related by multiples of ____.
10
The temperature (in °C) at which water boils is ____________________.
100 °C
If you were to round off the measurement 2.33501 grams to the nearest hundredths place, you would get__.
2.34 g
Convert 255 centimeters to meters, millimeters, and kilometers
2.55 m; 2550 mm; 0.00255 km
300 cm = _____ m
3
What is the freezing point of water on the Fahrenheit temperature scale?
32ºF
43 km = _____ m
43,000
A section of a circle graph measures 180°.What percent of the circle graph is this section?
50%
A certain atom has 26 protons, 26 electrons, and 30 neutrons. It has a mass number of ____.
56
Calculate the volume of a container that is 5 centimeters long, 4 centimeters wide, and 5 cm tall.
5x4x5=100 cm3
Draw the Bohr atomic model for Oxygen (O).
8p+ 8e-
Look at Chapter 6, Figure 6-1 in your notes. Which car has the greatest potential energy?
A
Identify the following elements: Ar, Cl, F, Na, He, N.
A - Argon CL - Chlorine F - Flourine Na - Sodium He - Helium N - Nitrogen
A dish of sugar and water solution is left in the Sun. After a few days, the solution has disappeared and a white residue remains on the dish. Has a physical or chemical change taken place? Explain.
A physical change has happened; The water has evaporated. Neither substance has changed identity.
Which of the following is a physical change?
Aluminum metal is pounded into thin sheets
Look at Chapter 6, Figure 6-1 in your notes. Which *cars* have the least potential energy?
B, D
Give an example of a career in life science.
Biologist, botanist, nurse, doctor, vet
The lowest energy level of a neutral atom is filled. Its second level contains three electrons. Which element is this an atom of? Explain your answer.
Boron; 5e- 5p+, Atomic # 5
What is one way scientific theories and scientific laws are similar?
Both are observations of a repeated pattern in nature.
Benzene is a chemical compound that contains six carbon atoms and six hydrogen atoms. Which of the following is the correct formula for benzene?
C6H6
Give an example of a career in physical science.
Chemist, Physicist, Engineer
Why do some cooking pots have copper bottoms?
Copper is a good conductor.
A ceramic pot that measures 1cm by 7cm by 2cm has a mass of 49g. What is the density of the ceramic pot?
D=m/v; D=49g/1x7x2=49g/14cm3=3.5g/cm3
A Lego block that measures 5cm by 5cm by 6cm has a mass of 75g. What is its density?
D=m/v; D=75g/5x5x6=75/150cm3g=0.5g/cm3
Which of the following people said the universe was made up of empty space and tiny bits of stuff? He called the tiny bits of stuff "atoms".
Democritus
____ is a physical property.
Density
Give an example of a career in Earth science.
Geologist, Volcanologist
Who discovered the electron?
J.J. Thomson
Who discovered the neutron?
James Chadwick
What is the SI unit of temperature?
K
freezing point of carbon dioxide
Kelvin
The statement that the total amount of energy in the universe never changes is called the ______________________________________.
Law of Conservation of Energy
The study of living things is __________________________________.
Life Science
Describe two advantages of the SI system over the system of measurements that is still commonly used in the United States.
SI is a worldwide standard, which makes it less confusing between scientists. TI is based on multiples of 10, which makes calculations easier.
Use the periodic table to complete the data in this table: ________*Properties of Selected Elements*________ Symbol_____Name______Atomic number__Atomic Mass . . . F . . . . . . ________ . . . . . . . ._____ . . . . . . . ________ _____ . . . . . Oxygen . . . . . . . . . . _____ . . . . . . . ________ _____ . . . . ________ . . . . . . . . . 15 . . . . . . . . . . ________ _____ . . . . ________ . . . . . . . ._____ . . . . . . . . . 32.065
Symbol___Name___Atomic number__Atomic Mass . . . F . . . . . Flourine . . . . . . . .9 . . . . . . . . . . 18.9 or 19 . . . O . . . . . Oxygen . . . . . . . . 8 . . . . . . . . . . 15.9 or 16 . . . P . . . . Phosphorus. . . . . . 15 . . . . . . . . . 30.9 or 31 . . . S. . . . . . .Sulfer . . . . . . . . .16 . . . . . . . . . . . 32.065
True/False A circle graph shows parts of a whole.
TRUE
True/False A kilogram is 1,000 times as large as a gram.
TRUE
True/False If false, change the identified word or phrase to make the statement true. *Chemical* properties can't be observed without changing the substance.
TRUE
True/False If false, change the identified word or phrase to make the statement true. Change of state of matter is a *physical* change.
TRUE
True/False If false, change the identified word or phrase to make the statement true. In a physical change, the substance *does not* change its identity.
TRUE
True/False If false, change the identified word or phrase to make the statement true. Malleability is a *physical* property.
TRUE
True/False An important part of planning an experiment is determining the materials needed.
TRUE
True/False Elements on the far right of the periodic table are classified as nonmetals.
TRUE
True/False Every atom of the same element has the same atomic number.
TRUE
True/False If you see the "Toxic" symbol on a bottle, that means the substance in the bottle could be poisonous.
TRUE
True/False Laboratory safety is an important concern for scientists.
TRUE
True/False Matter always has mass.
TRUE
True/False Variables are those factors that can be changed in an experiment.
TRUE
True/False When you are swinging on a playground swing, your potential energy is greatest at the highest point.
TRUE
True/False When you pick up an ice cube, the heat from your hand transfers to the ice.
TRUE
Barb has a collection of African Violet plants. Some seem to thrive, while others die. She has decided to perform an experiment to determine what might be causing the violets to die. She has decided to place one of the violets by a window and a second one in a dark corner of the room. What is a possible hypothesis for this experiment?
The plants by the window will live.
*Calories Used While Swimming for 30 Minutes* *Type of Stroke*___*56-kg Woman*___*77-kg Man* Backstroke . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Breaststroke . . . . . . . . . . . . 91 . . . . . . . . . . . . . . . 125 Fast Craw . . . . . . . . . . . . . .l87 . . . . . . . . . . . . . . . 120 Slow Crawl . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Sidestroke . . . . . . . . . . . . . .68 . . . . . . . . . . . . . . . . 90 Treading Water . . . . . . . . . .35 . . . . . . . . . . . . . . . .48 There are three factors that vary in the table. One is the number of Calories. What are the other two?
Type of stroke; type of swimmer
Explain how can you measure the volume of a solid that has an irregular shape?
Volume by immersion
*Calories Used While Swimming for 30 Minutes* *Type of Stroke*___*56-kg Woman*___*77-kg Man* Backstroke . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Breaststroke . . . . . . . . . . . . 91 . . . . . . . . . . . . . . . 125 Fast Craw . . . . . . . . . . . . . .l87 . . . . . . . . . . . . . . . 120 Slow Crawl . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Sidestroke . . . . . . . . . . . . . .68 . . . . . . . . . . . . . . . . 90 Treading Water . . . . . . . . . .35 . . . . . . . . . . . . . . . .48 According to table, which activity or activities should a swimmer choose to burn the most calories?
backstroke or slow crawl
*Calories Used While Swimming for 30 Minutes* *Type of Stroke*___*56-kg Woman*___*77-kg Man* Backstroke . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Breaststroke . . . . . . . . . . . . 91 . . . . . . . . . . . . . . . 125 Fast Craw . . . . . . . . . . . . . .l87 . . . . . . . . . . . . . . . 120 Slow Crawl . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Sidestroke . . . . . . . . . . . . . .68 . . . . . . . . . . . . . . . . 90 Treading Water . . . . . . . . . .35 . . . . . . . . . . . . . . . .48 What type of graph could you make from the data in table that would include all the factors that vary?
bar graph
The temperature at which a liquid becomes a gas is the ____ point.
boiling
The change that is NOT a physical change is ____.
burning
A positively charged ion is a(n) ___________________________.
cation
If an object has energy, then that object has the ability to cause ________________________.
change
A cake baking is an example of a ____________________ change.
chemical
A change in color is evidence of a ____________________ change.
chemical
Classify the following as either a physical change or chemical change. a newspaper burns in the fireplace
chemical
Classify the following as either a physical change or chemical change. a loaf of bread is baked
chemical
Classify the following as either a physical change or chemical change. apple cider become vinegar
chemical
Classify the following as either a physical change or chemical change. magnesium metal burns and becomes white powder
chemical
Classifying according to ____________________ properties can be difficult because a substance must be changed to observe these properties.
chemical
Flammability is a(n) ____________________ property.
chemical
The movement of thermal energy from warm objects to cool objects
heat
A prediction about a problem that can be tested is a(n) ____.
hypothesis
To ____ means to draw a conclusion based on something you observe.
infer
A material that reduces the flow of heat by conduction, convection, and radiation is called a(n) ____.
insulator
Cooking pots usually have handles made of materials that are ______________________ of heat.
insulators
An electrically charged atom is a(n) ________________________.
ion
Chlorine-35 and Chlorine-37 are examples of _________________________.
isotopes
mass of a bowling ball
kilogram
Which unit would you use to measure the distance from Dallas, Texas, to Memphis, Tennessee?
kilometer
When we move, our muscles transform chemical energy from our food into ____________________ energy and heat.
kinetic
As the temperature of a material increases, the average ____ of its particles also increases.
kinetic energy
Energy of motion
kinetic energy
The measure of the average ___________________________ of particles in a material is called temperature.
kinetic energy
The three branches of science are ____, Earth, and physical.
life
Pieces of colored construction paper fade when left in the sunlight because the dye has the ability to react with ____________________.
light
The four states of matter are solid, ____________________, gas, and ____________________.
liquid; plasma
volume of orange juice
liter
The melting point of silver is a ____.
physical property
Science cannot answer questions about ____.
politics
What are the two main types of energy that relate to motion?
potential and kinetic
A rock sitting on top of a cliff has ____.
potential energy
Energy based on position
potential energy
The higher a hill, the more _____________________ energy a skier has at the top and the more ____________________ energy while skiing down.
potential; kinetic
The more decimal places a measuring device has, the more _____ the device.
precise
Which of the following is the positively charged subatomic particle?
proton
Energy moves from the Sun to Earth by ___________________________.
radiation
The heat a snake feels from the heat lamp above him.
radiation
Type of energy movement used by microwave ovens
radiation
Which type of energy transfer occurs even in a vacuum?
radiation
You feel the heat coming off a fire by holding your hand near it.
radiation
Experiments and investigations must be ____.
repeatable
Man's effort to learn more about God's creation is ____.
science
A possible explanation to a pattern in nature is a ________________________________.
scientific theory
Which of the following CANNOT be classified as matter?
the heat given off by a light bulb
Aaron is building a model car for science class. He wants to know what size wheels to put on his car so that his car will move faster. He decides to perform a controlled experiment. List five variables that should remain constant in his controlled experiment.
the surface, the car
Scientific ____ must be supported by observations and results from many investigations and are not absolute.
theories
How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2?
three
*Calories Used While Swimming for 30 Minutes* *Type of Stroke*___*56-kg Woman*___*77-kg Man* Backstroke . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Breaststroke . . . . . . . . . . . . 91 . . . . . . . . . . . . . . . 125 Fast Craw . . . . . . . . . . . . . .l87 . . . . . . . . . . . . . . . 120 Slow Crawl . . . . . . . . . . . . . 95 . . . . . . . . . . . . . . . 130 Sidestroke . . . . . . . . . . . . . .68 . . . . . . . . . . . . . . . . 90 Treading Water . . . . . . . . . .35 . . . . . . . . . . . . . . . .48 There is a fourth variable mentioned in table that is kept constant. What is this variable?
time
Any change of energy from one form to another is called a(n) ___________________________.
transformation
The _____ of an object measures how much space the object takes up.
volume
When you measure something in m³, you are measuring ____.
volume
Explain how you could find the volume of an irregularly shaped piece of aluminum.
volume by immersion
When a sugar and water solution is evaporated, the sugar left behind has less mass than the original solution. The "missing" mass is found as ____________________.
water vapor
What is the only variable that should change in Aaron's controlled experiment?
wheel