Vocabulary
What is the definition of an element?
An element is a substance made up of one type of atom and cannot be broken into simpler substances by ordinary chemical means.
What are compounds?
Compounds are substances composed of atoms of two or more different elements bonded together in specific ratios.
What is water's pH?
Water's pH is neutral. It isn't acidic or basic. Therefore, its pH is 7.0.
An enzyme acts as a catalyst to a chemical reaction by
reducing the activation energy, thereby increasing the rate of reaction.
What is the boiling point of water in Celsius?
100 degrees Celsius.
What is the definition of a catalyst?
A catalyst is a substance that increases the rate of the reaction.
What is an ionic bond?
When one atom transfers an electron to another atom causing them both to become ions and creating an ionic bond.
What substances do not dissolve in water?
Non-polar molecule substances, such as oil.
What are the things that happen when a chemical reaction takes place?
Form of precipitates, change of color, change of smell, change of shape, etc.
What is the enzyme that dissolves dairy products called?
Lactate
What is the definition of cohesion?
The attraction among molecules of a substance
What is a covalent bond?
A covalent bond is when two or more atoms share an electrons.
What is water known as? (hint: its not H2O)
Water is known as the "universal solvent".
Enzymes are proteins that are found in cells. What is their role?
Enzymes are proteins that act upon substrate molecules and decrease the activation energy necessary for a chemical reaction to occur by stabilizing the transition state.
Why does your body get a fever when you're sick?
Because it is trying to kill the bacteria or virus you contracted.
What is the definition of adhesion?
The attraction among molecules of different substances.
Which bond is stronger covalent or ionic?
An ionic bond is stronger; however, covalent bonds can still be strong.
Is H2O a polar or non-polar molecule?
It is a polar molecule.
Chemical reactions always involve
changes in the chemical bonds that join atoms in compounds
What is something special water can do?
Water can boil & freeze at the same time.
What is the difference between a polar and a nonpolar chemical bond?
Polar bonds are when two or more atoms pull unequally on electrons. and a non-polar bond is when two or more atoms pull equally on electrons.
Because it's a very reactive substance and it is flammable therefore dangerous.
What property do hydrogen bonds give H2O?
It gives H2O the property of abnormally high specific heat.
Chemical reactions that absorb energy are known as ________________________.
endothermic
True or false- is lighting 3 times hotter than the sun?
True