Atoms & Elements (S8P1a)
What is the smallest unit of matter that makes up everything around us?
What is an Atom
A substance made of two or more elements chemically combined is called a what?
What is a Compound
What kind of change is it when water freezes?
What is Physical change
A property that can be observed without changing the substance is a ______ property.
What is Physical
What does the Law of Conservation of Matter state?
What is Matter cannot be created or destroyed, only changed in form.
The number of protons in an atom determines what?
What is The element’s identity
True or False: A mixture can be separated by physical means.
What is True
What kind of change is it when metal rusts?
What is Chemical Change
What property describes how tightly packed particles are in a substance?
What is Density
What are reactants in a chemical equation?
What is The substances you start with before the reaction.
What are the three subatomic particles found in an atom?
What is Protons, neutrons, and electrons
What is the difference between a heterogeneous and a homogeneous mixture?
What is
Heterogeneous = visibly different parts; Homogeneous = uniform throughout
What are 2 signs of a chemical change?
What is Color change, gas produced, temperature change, or precipitate formed
What are examples of chemical properties?
What is Reactivity and combustibility
What are products in a chemical equation?
What is The new substances formed after the reaction.
What part of the atom has a negative charge and moves around the nucleus?
What is Electron
Give an example of a compound and a mixture.
What is Compound: Water (H₂O); Mixture: Salad
Melting, freezing, and boiling are examples of what kind of change?
What is Physical
Why is density considered a physical property?
What is It doesn’t change the substance’s identity
What is a coefficient in a chemical equation used for?
What is It shows how many molecules of each substance are involved.
How do you find the number of neutrons in an atom?
What is Subtract the atomic number from the atomic mass
What does the formula CO₂ tell you about the atoms in the compound?
What is 1 carbon atom and 2 oxygen atoms
Burning a candle is both a physical and chemical change. Explain why.
What is Wax melting = physical; Wick burning = chemical
What is the difference between a physical and chemical property?
What is Physical can be observed without changing matter; chemical describes how matter reacts
What is a subscript, and what does it tell you?
What is The small number that shows how many atoms of an element are in a molecule.