unit 1
what is the variable that is purposely changed or manipulated?
Independent variable
what is the basic unit of matter
neutron, proton, electron, atom
Atom
what charge does a anion have?
a negatively charged ion
Which of the states of matter has the highest kinetic energy?
liquid, solid, plasma, gas
Plasma
what is gold jewelry
homogenous, heterogeneous
homogenous
what type of reaction is melting gold to make a ring.
Physical reaction
Charles’s law states that the temperature and volume for a gas at constant pressure have a ___ relationship
Direct
what happens to the valence electrons when you go down a group in the periodic table?
number of valence electrons unchanged
Which reaction represents decomposition?
2KCl → 2K + Cl2, Mg + 2HCl → MgCl2 + H2, 3H2 + N2 → 2NH3, 4Al + 3O2 → 2Al2O3
2KCl → 2K + Cl2
mixing salt (a polar substance) in oil (a nonpolar substance) instead of in water (a polar substance)
less soluble, more soluble, no change
less soluble
which one would have the greatest kinetic energy?
golf ball, tennis ball, bowling ball, or a baseball
Bowling ball
Which atom would exert the most pressure?
carbon, nitrogen, hydrogen, oxygen
Oxygen atom
Al2O3
what is the correct chemical name of the ionic compound.
aluminum dioxide, aluminum oxide, aluminum oxygen, aluminum dioxygen
aluminum oxide
which of the atoms is more unstable and high in energy?
Tritium atom, or Deuterium atom
Tritium atom
What is the average ph level of blood?
between 7.37 and 7.43