A student is using a balance to measure 50
grams of powdered starch for an experiment.
The student accidentally pours too much
starch from the bottle onto the balance. What
should the student do with the extra starch?

Students must do the following four things
after finishing an experiment. The steps are
shown out of order.
1. Wash beaker
2. Put away unused chemicals
3. Wash hands
4. Wipe off lab bench
Which of the steps should the students do last?

These are the distances from the planets to
the sun:
Mercury: 58,000,000 km,
Venus: 110,000,000 km,
Earth: 150,000,000 km,
Mars: 230,000,000 km,
Jupiter: 780,000,000 km,
Saturn: 1,400,000,000 km,
Uranus: 2,900,000,000 km,
Neptune: 4,500,000,000 km,
Pluto: 5,900,000,000 km.
Some students are preparing a report on our
solar system. Which of the following would
be the MOST effective way to present the data
above?

A student mixed two clear liquids in a beaker,
then covered the beaker and let it sit. White
crystals formed at the bottom of the beaker.
The student concluded that the crystals are a
new substance formed by the two liquids.
Which of the following observations, if made
by the student, MOST strengthen the student's
conclusion?

Michael Faraday thought that because an
electric current could create a magnetic field,
a magnetic field should be able to create an
electric current. Faraday's research proved his
idea correct and laid the groundwork for the
invention of the —

Students experimenting with chemical
changes need to measure 15 mL of vinegar.
Which graduated cylinder below contains 15
mL of vinegar?

Some students are investigating the
similarities and differences between plant and
animal cells. Which of the following sets of
equipment would be MOST useful for this
investigation?

Some students riding bicycles coasted down a
large hill. Later in their trip, they coasted
down a small hill. Their speed at the bottom of
the large hill was greater than their speed at
the bottom of the small hill. Which of the
following statements MOST likely explains
why their final speed on the large hill was
greater?

Some students were studying the effects of
friction on the motion of objects. They slid a
block down a 1-meter long wooden ramp
three times and recorded the time it took to
travel the length of the ramp. The students
repeated the procedure with the ramp covered
with cloth, and then again with the ramp
covered with carpet. Their data are in the chart
below.

Which conclusion MOST completely
describes the results of this experiment?

Scientists often study examples in nature
when designing future technology. A scientist
studies bacteria that live near fuel tanks and
feed on materials that are toxic to ocean birds.
This research will MOST likely lead to —

A student measured the length of five leaves
with a centimeter ruler. The lengths that the
student measured are shown in the table.

Which is the average length of the leaves that
the student measured?

A student wanted to study ant populations.
The student set up a small bottle containing a
piece of food. The student recorded the color
of the first five ants to walk into the bottle.
The student repeated the experiment 20 times.
The results are shown in the table.

In which percent of the trials did EXACTLY
two black ants walk into the bottle?

A student slides two slabs of clay on a table to
model Earth's tectonic plates. Which of the
following would be hardest to show using this
model?

Which of these is the best way to show the
shapes of the organs of the digestive system?

A scientist studied 700 children with colds.
One half of the students were given a new
cold medicine. The other half of the children
had no medicine. It took all of the children
about 10 days to get over their colds. About
7% of the children taking the medicine got a
mild rash. About 3% of the children not taking
the medicine got a mild rash.
The information above best supports the
conclusion that the new medicine
probably —

Long ago people believed Earth was flat.
Which of these would have been the best
observation to use to show the people that this
hypothesis was wrong?

A chemical change is

By studying the terms and directions of
arrows in the diagram, you can determine that

Properties of Iron

Using the table above, which of the following
represent the chemical property(ies) of iron?

Students were given four unknown substances
and asked to observe their characteristics.
Their observations are shown in the table
below.

Which of the unknown substances is MOST
likely a metal?

A teacher had two clear liquids, Liquid A and
Liquid B. The teacher filled one beaker with
Liquid A, and then added Liquid B drop by
drop until solid crystals suddenly formed on
the bottom of the beaker. Which of these is the
MOST LIKELY explanation for what
happened?

Vanessa had a beaker with a small amount of
baking soda. She added a few drops of vinegar
to the baking soda and observed fizzing and
bubbling. Based on her observation, which of
these can Vanessa determine about the new
substance formed by mixing the baking soda
and vinegar?

Howard poured a liter of blue colored water in
a 2-liter glass jar and added a couple of rocks
to the bottom. He inverted an empty 2-liter
glass jar on top of the first, tightly taped the
two jars together, and placed them in a sunny,
warm window. After 24 hours, he observed
changes in the jar. Howard made a second
model, substituting salt water for blue colored
water. After having both setups in the window
for two days, he noticed that the condensed
drops on both jars were colorless. He
concluded that

In which stages does water change from a
liquid to a gas?

Interpret both diagrams to choose the correct
statement below.

The ability to do work can also be defined as

Which of these pathways can energy from the
Sun take through an ecosystem?