Atom
What is an atom?
the smallest particle that makes up matter/ things in the universe
What is the atomic number of hydrogen?
1
In the Properties of Molecular Compounds lab, was it the sugar or the salt that had a higher melting point? How did you know?
Is putting salt in water and dissolving it and example of a physical or chemical change?
physical change
What three components make up an atom?
- proton
- electron
- neutron
What is the chemical symbol of potassium?
In the Properties of Molecular Compounds lab, is salt considered a molecular compound? If not, what kind of compound?
No, it is an ionic compound.
What is an example of a chemical change?
- mixing vinegar and baking soda which causes bubbles to form
- color change with phenolphthalein when adding a base that turns the solution pink
What is the nucleus of the atom made up of?
- protons
- neutrons
What element has the chemical symbol of Au?
gold
From this table, what was the mystery chemical?
flour
How come oil and water do not mix?
Which is heavier proton or electron?
proton
How many valence electrons does chlorine have?
7
How do you know something went through a physical change?
- change in state (solid to liquid, liquid to gas, solid to gas, or vice versa)
- the substance did not change chemically
- change that alters the form or appearance of substance without changing it into a different substance
What is the law of conservation of matter state?
What is the electrical charge of electrons?
negative
What is the atomic mass of sulfur?
32.06
How do you know something went through a physical change?
- color change
- gas production
- precipitate forms
- heat production or light
- change in odor