Vocabulary
What is a chemical reaction?
a process where one or more substances are converted into one or more new substances
How are homogenous mixtures and heterogeneous mixtures different?
Homogenous mixtures you can't see the different parts of the mixture where heterogenous mixture can see the various parts.
A substance has a mass of 456 grams and a volume of 3.5 mL. What is its density?
130.29 g/mL
What are the reactants in the following chemical equation:
PCl5 + 4 H2O -> H3PO4 + 5HCl
PCl5 H2O
List five specific examples of physical properties.
Luster, Brittleness, Density, Magnetism, Solubility, Boiling Point, Melting Point, Freezing Point, clarity
What is kinetic energy?
energy an object posses due to its motion
What are the differences between physical and chemical changes?
Physical change is a change in the physical form of matter that does not alter its chemical composition. Chemical changes are a change in the chemical composition of matter.
Steel has a density of 8.5 g/cm3. What is the volume of a block of steel with a mass of 105 grams?
12.35 cm3
What are the products of the chemical reaction?
PCl5 + 4 H2O -> H3PO4 + 5HCl
H3PO4 HCl
List five examples of chemical properties.
flammability, pH, radioactivity, toxicity, reactivity with other chemicals such as water, acid, and oxygen
What is an atom?
the smallest unit of a substance that has all chemical properties of the substance
What is the differences of a compound and an element?
The density of a piece of brass is 8.40 g/cm3. If the volume of the brass is 60.71 cm3, find the mass of the brass.
509.96 g
How many hydrogen atoms are in H3PO4?
3
Are changes in state of matter physical changes or chemical changes?
physical
the science of what matter is made of and how it changes
What are the differences between a compound and a molecule?
A molecule is a group of atoms that are bonded together, representing the smallest unit of a substance that behaves like a substance. A compound is a substance made up of atoms of 2 or more different elements.
A piece of titanium has a mass of 678 grams. The block of titanium has dimensions of 4 cm by 3 cm by 2 cm. What is the density of the block of titanium?
28.25 g/cm3
How many molecules are in 5 HCl?
5
Is energy absorbed or released when undergoing condensation?
released
What does it mean to be malleable?
the material can be hammered easily when stressed
What are the differences of a pure substance and a mixture?
A mixture has a variable composition where a pure substance has a fixed composition.
A bouncy ball is placed in a graduated cylinder raising the volume from 8.9 mL to 12.6 mL. The bouncy ball has a density of 4.6 g/mL, what is the mass of the bouncy ball?
17.02 g
How many atoms of hydrogen are in 4 H2O?
8
What does the law of conversion of Mass and Energy state?
In physical and chemical changes, mass or energy are neither created nor destroyed.