pH Scale
Is a solution with a pH of 3 acidic, basic, or neutral?
Acidic
What type of bond forms between separate water molecules?
Hydrogen bonds
What are the starting substances in a chemical reaction called?
Reactants
What is the chemical symbol for calcium?
Ca
What binds to an enzyme's active site?
A substrate
What is the pH of a neutral substance?
7
What kind of bond holds hydrogen and oxygen atoms together within one water molecule?
Covalent bonds
What are the substances formed by a chemical reaction called?
Products
Find Pd. What is its element name and atomic number?
Palladium, 46
Do enzymes speed up or slow down chemical reactions?
Speed up
Which is more basic? pH 8 or pH 12
pH 12
In a covalent bond, are atoms shared, gained, or recieved?
Shared
In a chemical reaction, are atoms created, destroyed, or rearranged?
Rearranged
How many protons does Arsenic have?
33
How do enzymes speed up reactions?
By lowering the activation energy
Two solutions have pH values of 4 and 9. Which solution has more hydrogen ions?
What type of bond transfers electrons between atoms?
Ionic bonds
A reaction releases heat into its surroundings. Is it exothermic or endothermic?
Exothermic
An element has an atomic mass of about 183.84. Use the periodic table to find its name, symbol, and atomic number.
Tungsten, W, 74
What is activation energy?
The amount of energy it requires to get a chemical reaction started
An enzyme works best at pH 7. It is placed in solutions with pH values of 2, 6, and 12. Which solution would you predict it works best in?
pH 6
Water climbs up a thin tube against gravity. Explain how cohesion and adhesion both help this happen.
Adhesion helps water stick to the sides of the tube. Cohesion helps water molecules stick to each other, pulling more water upward.
A student mixes two substances, and the container feels colder. Is the reaction exothermic or endothermic?
Endothermic
An element has an atomic mass of about 63.55. Name the element, its symbol, and its atomic number.
Copper, Cu, 29
What may happen to an enzyme if the temperature gets too high?
It might denature