WorksheetsChemistry 1st Semester Exam 23/24
Total questions: 40
Worksheet time: 10hrs 0mins
If you spill or break something during an experiment, what is the FIRST thing you should do?
Tell the teacher.
Clean it up.
Cover it with a paper towel.
When in the lab...
long sleeves and loose clothing should be rolled up.
closed toe shoes should be worn.
long hair should be pulled back.
all of the above.
What is the purpose of lab safety?
to do Science experiments
to try our best NOT to get injured
to goof around and get in trouble
If you are not sure what to do during a lab activity:
guess
change lab partners
ask a teacher
Helping to clean up the lab or classroom is the job of:
old students.
transfer students.
each and every student.
Which of the following are examples of dressing appropriately in the lab?
Pulling long hair back
Wearing sandals
Leaving long hair down to get in the chemicals.
Which piece of lab equipment do we wear on our face?
wash bottle
striker
safety goggles
The _measures temperature.
top pan balance
thermometer
measuring cylinder
What does a triple beam balance measure?
the mass or weight of an object
volume
length
Which piece of lab equipment is used to look at bacteria?
magnifying glass
slide
microscope
What is the chart called that organizes all of the elements found on Earth?
Element Chart
Table of Elements
Periodic Table of Elements
The vertical (up and down) columns in the Periodic Table are called
groups
towers
periods
atomic mass
atomic number
valence electrons
What was important about the discovery of gallium, scandium, and germanium?
It proved Mendeleev's theory.
It disproved Mendeleev's theory.
Nothing
Which of the following are physical properties of metal?
Luster
Conductivity
Malleability
all of the above
What is the atomic symbol for potassium?
C
Ch
K
What is the atomic symbol for sodium?
Na
So
N
What is the atomic number for oxygen?
8
4
12
The number at the bottom of each square on the periodic table is the:
atomic number
atomic mass
chemical symbol
atomic number
Chemical Symbol
Element Name
This is the smallest unit of an element.
atom
molecule
compound
What is this element ... Au
Iron
Gold
Titanium
How many elements are in H2O?
2
3
4
Is salt (NaCI) a compound or an element?
Element
Compound
An element is made up of only one kind of:
isotope
atom
plastic
found on the periodic table
made from two or more elements
a pure substance
A description of objects that can be measured and observed.
melting point
mustangs
physical properties
A physical property can be observed with your
Eyes
Ears
Hands
All of the above
An example of a physical property is
flammability
acidic
color
Which is a PHYSICAL change?
Wood is burned and releases ash and smoke
Iron rusts over time
water freezing
Which is a CHEMICAL change?
Wood is burned releasing ash and smoke
Rocks separate when soil is sifted
Salt dissolves in water
Chemical Change
Physical Change
Physical
Chemical
How many elements are in HHe?
3
2
4
Found at the lower right of an element, it tells you how many atoms of that element are in a compound.
subscripts
neutrons
atomic number
How many atoms of hydrogen are in H2O?
1
2
3
Molecular bonds between atoms has to do with the behavior of its:
protons
neutrons
electrons
Break this down: MgSO47(H2O)
mg, S, O4, 14 H, O 7
1 Mg, 1 S, 11 O, 14 H
7 Mg, 7 S, 28 O, 14 H
