End of Semester Test: Chemistry A (Plato)
Exam Questions And Answers 100% Pass.
A __________ is scientific knowledge established through direct observation and remains
constant. Scientific knowledge can change when scientists ___________ - answer1. fact
2. conduct experiments
Giselle is workin...
End of Semester Test: Chemistry A (Plato)
Exam Questions And Answers 100% Pass.
A __________ is scientific knowledge established through direct observation and remains
constant. Scientific knowledge can change when scientists ___________ - answer✔1. fact
2. conduct experiments
Giselle is working with a chemical substance in a laboratory. She observes that when the
chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this
assumption to verify it. Which type of scientific knowledge is Giselle's assumption? -
answer✔B. hypothesis
Which sentence is a scientific statement? - answer✔E. there are no living things on the moon
Avogadro's number is a constant that helps scientists count atoms and molecules. It is
approximately equal to 602,200,000,000,000,000,000,000. How is this number expressed in
scientific notation? - answer✔D. 6.02 × 10^23
Which of the following is a physical model of the Sun? - answer✔E. a small yellow ball that
represents the sun
Drag the tiles to the correct boxes. Not all tiles will be used.
Match each SI unit to the quantity it measures. - answer✔length > meter
mass > kilogram
time > second
A student hears in chemistry class that a certain object is made of a pure substance. What can the
student conclude about the object based on this information? - answer✔D. it is made of either an
element or a compound
A student is trying to distinguish elements from compounds. If a substance is an element, what
else must be true about it? - answer✔1. It can be found on the periodic table
2. It is made of only one type of atom
Drag the tiles to the correct boxes to complete the pairs.
Match each statement with the state of matter it describes. - answer✔plasma > It retains its shape
regardless of the shape of the container
gas > particles move freely but do not separate from neighboring particles
liquid > this state, in which the particles are at extremely high temperatures,is rarely found on
Earth
solid > it expands to fill the volume of the container
In an experiment, chemists heated a solid, red substance in a test tube. Vapors from the heated
red substance condensed as a metallic liquid on the side of the tube. The red substance eventually
disappeared, leaving only the metallic liquid and producing a gas that escaped from the tube.
Which statement best describes what happened to the red substance in this experiment? -
answer✔C. the experiment shows that the red substance experienced a chemical change
A student has samples of five different types of metal. She measures the mass and volume of
each sample. The measurements she took are in the table.
The student also has another piece of metal. She knows it is the same type of metal as one of her
other samples, but she doesn't know which one it is. She finds that its mass is 33.5 grams and its
volume is 3.2 centimeters^3. What type of metal is the unknown sample? - answer✔E. silver
10.49
The subatomic particles called __________ are found in the nucleus of an atom, and
__________ travel around them. - answer✔1. protons and neutrons
2. electrons
An ion has a net charge of 3+. If this ion has 8 protons, how many electrons does it have? -
answer✔B. 5
How did Rutherford's atomic model fix the shortcomings of Thomson's atomic model? -
answer✔B. rutherford's model showed that the positive charge is concentrated in a small area.
E. rutherford's model proved that much of the atom consists mostly of empty space.
Drag the tiles to the correct location on the table. Not all tiles will be used.
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