Bonds
What does a chemical equation show?
Reactants that enter into the reaction and the products formed
Glass breaking is a form of what type of change?
What is chemistry
Study of matter and the changes it experiences
True or False: A thorough understanding of chemistry and a biblical worldview are necessary to know how to properly use chemicals, such as in the use of medicines.
True
6Sb + I2 => 2SbI3
K + Br2 => 2KBr
2Sr + O2 => 2SrO
2KClO3 => 2KCl + 4O2
3. 2Sr + O2 => 2SrO
Sodium and chlorine chemically combine to form sodium chloride (table salt). Identify the reactant(s) and product(s) in this reaction
Reactant- Sodium Chlorine
Product- Sodium-Chloride
Write the purpose of carbohydrates for living things:
Life Energy
What is temperature
Speed of particles
What is the smallest possible particle of an element?
Atom
What is a molecule?
Smallest part of a covalent compound.
What is the definition of a compound?
pure substance made of two or more elements chemically combined
What is the first law of thermodynamics?
Matter can never be created or destroyed
A compound held together by opposite electrical charges is a(n) compound.
ionic compound
What does the Brownian Motion state?
Causes matter to spread out through diffusion
What is the difference between an acid and a base?
Acid- Substance that dissolves in water to form hydrogen ions- tastes sour
Base- dissolves in hydroxide ions, tastes bitter
What is the difference between cohesion and adhesion?
Cohesion- attraction of water molecules
Adhesion- attraction of other substances
Why is carbon important for life?
Usually forms 4 bonds because neutral carbon has 4 valence electrons
It can bond with itself, and form single, double, and triple bonds with other elements
Serves many purposes including structural support, enzymes and storing energy
What is entropy?
Tendency of energy to disperse
What are cations and anions?
Cation- Positively charged ion
Anion- Negatively charged ion
What do organic compounds contain?
Carbon, hydrogen, oxygen
What are 4 examples of organic compounds?
Carbohydrates, lipids, proteins, and nucleotides
Using your understanding of the molecular structure of water, explain why it is important for living things.
The electron cloud around the molecule is shifted towards the oxygen, forming areas of negative charge around the oxygen and areas of positive charge around the hydrogen atoms.
65% of body
The hydrogen on one water molecule attracts the oxygen of another water molecule. The hydrogen can also attract flourine and nitrogen on other molecules
Define Ductility, Brittleness and Density
- What types of changes are these?
Ductility- Ability to bend without breaking
Brittleness- Tendency to crack or break
Density- Mass per unit volume
List and give examples of five different forms of energy:
Mechanical- movement
Acoustic- Sound
Light
Thermal
Chemical
What 3 things determine thermal energy? (think about molecules)
1- Number of molecules
2- Temperature of the molecules, speed
3- Arrangement of the molecules, state of matter