What state of matter consists of closely packed particles that vibrate in place?
Two or more elements chemically combined
What is the density of a block that has a mass of 10 grams and a volume of 5 mL?
When balancing chemical reactions, how do the number of atoms in the reactants compare to the products?
Most elements on the periodic table are classified as _______, which are generally hard, shiny, and good conductors of electricity.
The center of the atom, called the nucleus, contains...
Every element on the periodic table has a different number of _______, which are the positively charged particles of the nucleus.
What is the mass of the most common isotope of carbon, C-12?
The electrons located in the outermost shell of an atom are called _______ electrons. These are responsible for bonding.
As the the number of protons in an atom INCREASES, the radius of the atom __________, because of the increased coulombic attraction between protons and electrons.
Compounds made of metals and nonmetals, such as NaCl, are called ________ compounds.
What is the charge of an ion that has 10 protons and has lost 2 electrons?
How many valence electrons do most atoms need in order to become stable?
What is the formula for magnesium oxide (Mg+2 and O-2)?
What type of bond forms when two nonmetal atoms share valence electrons?
What is the charge of a proton and an electron?
When the volume of a gas decreases, the pressure _____
Water has many unique properties, including the property of cohesion. This means that water molecules can stick together to form droplets. Why does this happen?
Grass stains do not easily dissolve from clothing with water alone. Instead, you must use detergents or stain removers. Why won't these stains dissolve in water?
As the temperature of a gas increases, the pressure increases because...
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