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04.08 Classifying Matter Module Exam
Terms in this set (22)
Darla claims that the first periodic table developed by Mendeleev was not completely accurate, so it is not useful at all. Harmony argues that it helped establish the periodic table we use today, making it more credible. Who is correct and why?
Harmony is correct, because Mendeleev's model made predictions that came true.
An ice cube is placed on a hot stove. Which of these statements best describes how heat moves between the ice cube and the stove?
Heat moves from the stove to the ice cube through conduction.
Which of these pairs of elements have the same number of valence electrons?
Sodium (Na) and potassium (K)
Which was a testable idea that J.J. Thomson developed through his experiments?
Atoms contain small, negatively charged particles.
If you hold your hand over a pot of boiling water, it feels hot. Explain how the boiling water is transferring heat to your hand.
Convection, because boiling water has enough energy to turn into water vapor, which rises through the air and transfers heat to your hand
Which statement is true about two isotopes of the same element?
They have different numbers of neutrons.
Which state of matter is made up of electrically charged particles?
How does the motion of particles in a gas change as the gas cools?
They move more slowly.
Which of the following correctly pairs the subatomic particle with its charge?
What happens to the molecules in a glass of water as the water evaporates?
They move faster.
The molecules in a steel bar absorb energy and begin moving more quickly. What is most likely happening to the steel bar?
Its temperature is increasing.
Which of these ideas was part of the earliest model of the atom?
Atoms are hard, tiny particles like billiard balls.
What happens to acetone molecules when you add heat to a beaker of liquid acetone?
They gain a higher average kinetic energy.
Which statement about subatomic particles is true?
Electrons are the subatomic particles with the smallest mass.
Which describes how chemical changes are different from physical changes?
Chemical changes involve the formation of a new substance.
Which of the following is true about scientific models?
Models are used to simplify the study of things.
Which of these statements best describes the relationship between elements, compounds, and pure substances?
Pure substances can be divided into two groups: elements and compounds.
Which best describes the current atomic theory?
It is the most powerful explanation scientists have to offer at this time
Why does a glass of ice water eventually have water droplets on the outside of the glass?
Water vapor in the air comes into contact with the cold glass, losing energy to it and condensing into droplets.
Which element would you expect to have a higher electronegativity than nitrogen (N)?
Which state of matter has both a fixed shape and a fixed volume?
When liquid helium is exposed to room temperature, it forms a gas. Which best explains why this happens?
The liquid helium absorbs energy from the air in the room.
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