Matter 1
All matter that is now living or was alive at one time, with carbon present, falls within the scientific division of:
organic chemistry
When 2 hydrogen atoms combine with one oxygen atom, the result is a water molecule, which is a(n):
compound
pH stands for:
potential hydrogen
pH balanced refers to a product that ranges from a pH of:
4.5 to 5.5
Matter with definite weight and volume but no definite shape is called:
liquid
Pure substances are made of only one type of:
atom or molecule
Acids tend to taste:
sour
On the pH scale, numbers greater than 7 indicate a(n):
alkaline solution
Protons have which type of electrical charge?
positive
When a substance gains an electron and oxygen is released, the process is called:
reduction
Why is pure water considered a neutral substance?
positive and negative ions balance each other out
On the pH scale, numbers less than 7 indicate a(n):
acidic solution
Atoms that are not missing any electrons in their outer shell and are considered electrically neutral are called:
Stable
What is created when amino acids join together in chains?
proteins
All of the following statements regarding the pH scale are true EXCEPT:
a. 7 indicates a neutral substance
b. values below 7 indicate more acidity
c. values below 7 indicate more alkalinity
d. logarithmic scale that identifies the degree of acidity or alkalinity of a substance
values below 7 indicate more alkalinity
What color does blue litmus paper turn when placed in an acid?
Red
What is an example of chemical change?
oxygen and hydrogen combining to form water
Which of the following biochemical compounds form components that fill the intercellular spaces in the skin?
a. lipids
b. amino acids
c. carbohydrates
d. peptide bonds
Lipids
What happens when an alkali is placed in water?
alkali decreases the concentration of hydrogen ions
A pH of 5 is how many more times acidic than a pH of 6?
A pH of 5 is 10 times more acidic than a pH of 6.