Unit 1
What are the 3 skills scientists use to learn about the natural world?
Observe, Infer, Predict
What is matter? There is more than one correct answer.
Anything that has mass
Anything that takes up space
True or False. The particles that make up a solid are closely locked into position and vibrate when they move.
True
What are the 4 properties of metal?
Malleability, ductility, conductivity, and luster
Valence electrons in an atoms are those that are what?
Held most loosely
What is a hypothesis?
A possible answer to a question
What is an element?
A pure substance that cannot be broken down
When particles in a liquid move slower when it begins to what?
Freeze
At the center of the atom is a tiny, but massive _________.
Nucleus
When an atom loses or gains electrons, it becomes a what?
Ion
What is a theory?
A well tested explanation of many observations
What is the law of conservation of matter?
Matter is not created or destroyed
How do particles in a gas move?
Move freely and collide with each other
An atom contains what 3 things?
Protons, neutrons, and electrons
What generally stronger and less reactive that the pure metals from which they are made?
Alloy
What is the SI?
The standard system of measurement for scientists
What is a chemical change?
Something that changes into a new substance
What are the 3 states of matter?
Solid, Liquid, Gas
Who was the FIRST person to discover radioactivity?
Henri Becquerel
In a _______ ________ electrons are shared unequally.
Polar bond
What are the two main areas of physical science?
Chemistry and Physics
What type of energy travels through space in waves?
Electromagnetic energy
What are 3 ways we measure gas?
Volume, Temperature, and Pressure
The atomic number of an atom is determined by the number of what?
Protons
________ _______ have low melting and boiling points and do not conduct electric current
Molecular compound