What Is Chemistry?
True/False
Chemistry is only about mixing dangerous chemicals.
False
Chemistry is the study of matter and its changes — it includes cooking, cleaning, medicine, and much more.
Fill in the Blanks
You should always ___ long hair before entering the lab.
A. tie back
B. wash
C. dye
D. comb
A. tie back
Tying back hair prevents it from catching fire or interfering with equipment.
True/False
A hypothesis is a wild guess made without any background knowledge.
False
A hypothesis is an educated prediction based on prior knowledge and observation.
True/False
Mass and weight are the same thing.
False
Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.
True/False
All metals are magnetic.
False
Only a few metals like iron, cobalt, and nickel are magnetic — most are not.
MCQ
Which of the following best describes chemistry?
A. Study of stars
B. Study of living things
C. Study of matter and its changes
D. Study of numbers
C. Study of matter and its changes
Chemistry focuses on matter, its properties, and how substances interact and transform.
True/False
It’s safe to leave a Bunsen burner unattended if the flame is small.
False
Never leave open flames unattended — even small ones can cause accidents.
MCQ
Which step comes first in the scientific method?
A. Analyze data
B. Form a hypothesis
C. Make observations
D. Draw conclusions
C. Make observations
Observation is the starting point — noticing something that leads to a question or investigation.
MCQ
Which of the following is a physical property?
A. Ability to rust
B. Flammability
C. Boiling point
D. Reactivity with acid
C. Boiling point
Boiling point is a physical property — it describes a change in state, not a chemical reaction.
MCQ
Which of the following is a non-metal?
A. Copper
B. Sulfur
C. Zinc
D. Aluminium
B. Sulfur
Sulfur is a non-metal — it’s brittle, dull, and does not conduct electricity.
Fill in the Blanks
The study of matter and how it behaves is called ___.
A. chemistry
B. astronomy
C. geography
D. economics
A. chemistry
Chemistry explores how matter changes, reacts, and interacts with energy.
MCQ
Never leave open flames unattended — even small ones can cause accidents.
A. Flame
B. Skull and crossbones
C. Test tube pouring on hand
D. Exclamation mark
C. Test tube pouring on hand
The corrosive symbol shows a substance damaging skin or materials — often acids or alkalis.
True/False
The dependent variable is what you measure in an experiment.
True
The dependent variable responds to changes in the independent variable — it's what you observe or measure.
Fill in the Blanks
The amount of space an object takes up is called its ___.
A. volume
B. mass
C. weight
D. density
A. volume
Volume measures how much space matter occupies, often in cmÂł or mL.
Fill in the Blanks
Materials that allow electricity to flow through them are called ___.
A. conductors
B. insulators
C. magnets
D. alloys
A. conductors
Conductors allow electric current to pass — metals like copper are good examples.
MCQ
Which branch of chemistry deals with carbon-based compounds?
A. Physical chemistry
B. Organic chemistry
C. Analytical chemistry
D. Inorganic chemistry
B. Organic chemistry
Organic chemistry studies compounds containing carbon, especially those found in living things.
True/False
Eating and drinking are allowed in the lab if no chemicals are present.
False
Food and drink are strictly prohibited in labs to prevent contamination and accidental ingestion.
MCQ
Which instrument is best for measuring mass?
A. Thermometer
B. Stopwatch
C. Balance
D. Measuring cylinder
C. Balance
A balance measures mass, while a measuring cylinder is used for volume.
MCQ
Which of the following materials is least dense?
A. Lead
B. Water
C. Air
D. Iron
C. Air
Air is a gas with particles far apart, making it much less dense than solids or liquids.
MCQ
Which of the following is a synthetic material?
A. Wood
B. Cotton
C. Nylon
D. Wool
C. Nylon
Nylon is man-made — it’s a synthetic polymer used in fabrics and ropes.
MCQ
Which of the following is not a chemical change?
A. Burning wood
B. Rusting iron
C. Melting ice
D. Baking a cake
chemical change?
C. Melting ice
Melting ice is a physical change — no new substance is formed.
Fill in the Blanks
Broken glassware should be reported and cleaned up using a ___.
A. dustpan
B. broom
C. gloved hand
D. tongs
D. tongs
Use tongs or forceps to avoid cuts — never pick up broken glass with bare hands.
MCQ
Which unit is used to measure volume in the lab?
A. grams
B. degrees
C. seconds
D. cubic centimeters
D. cubic centimeters
Volume is measured in cmÂł or mL, not grams (mass) or seconds (time).
Fill in the Blanks
A substance that can be stretched into wires is said to be ___.
A. ductile
B. brittle
C. soluble
D. magnetic
A. ductile
Ductility is the ability to be drawn into wires — common in metals like copper.
Fill in the Blanks
A mixture of two or more metals is called an ___.
A. alloy
B. compound
C. solution
D. element
A. alloy
Alloys like brass (copper + zinc) combine metals for improved properties.