stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Water & Biochem Basics Flashcards | StudBud
Explore
/
Water & Biochem Basics
Water & Biochem Basics
20 terms
·
StudBud Administration
·
28 plays
G10 MYP Biology review game: Properties of Water and the Basics of Biochemistry
Flashcards
20 cards
F
Practice quiz
P
Host live
L
Questions
20
Answers
1
Why is ice less dense than liquid water at 4°C?
Because it floats.
Because hydrogen bonds keep molecules further apart in ice.
Because 4°C is denser than 0°C.
Because water has a high specific heat.
2
H
2
SO
4
is ________ because it donates a hydrogen ion (H
+
).
a water molecule
an acid
a base
a neutral molecule
3
Water is polar because...
it's a bear.
the hydrogens are 104.5° apart.
the electrons are in a cloud.
oxygen is more electronegative.
4
Water is its most dense at what temperature?
4°C
100°C
25°C
0°C
5
How many more electrons does sodium (Na) want to fill its valence shell?
2
3
1
trick question: it wants to lose one.
6
Ca(OH)
2
is ________ because it donates a hydroxide ion (OH
-
).
a base
a water molecule
a neutral molecule
an acid
7
Which of the following kinds of substances can water NOT dissolve?
Water can dissolve all of these.
ionic molecules
polar-covalent molecules
nonpolar-covalent molecules
8
Oxygen, hydrogen, carbon, and nitrogen are examples of...
homogenous mixtures
compounds
heterogeneous mixtures
elements
9
Name the three mixtures in the correct order:
colloid, solution, suspension
unknowable: all knowledge is an illusion.
suspension, colloid, solution
solution, colloid, suspension
10
You have hydrochloric acid in your stomach to...
...kill bacteria.
...prevent heartburn.
...dissolve food.
...create an environment with the optimal pH for pepsin, a digestive enzyme
11
2 hydrogen atoms & one oxygen atom form a molecule of water by making...
Covalent bonds
Hydrogen bonds
Metallic bonds
Ionic bonds
12
On the period table, the atomic number is the number of...
protons
neutrons
chairs.
electrons
13
Table salt, water, and steel are examples of...
elements
homogenous mixtures
compounds
heterogeneous mixtures
14
Water molecules stick together because they are polar molecules. What kind of bond to they form between water molecules?
metalic bonds
ionic bonds
hydrogen bonds.
covalent bonds
15
What do you call a phase change from solid to gas?
sublimation
melting
deposition
boiling
16
One atom of sodium (Na) & one atom of chloride (Cl) form a molecule of salt by making...
covalent bonds
metallic bonds
ionic bonds
hydrogen bonds
17
The water molecule behaves differently from most other molecules because of its...
Polarity
Size
Specific Heat
Mass
18
The atomic mass is equal to the...
...mass of the protons +neutrons + electrons
...mass of the protons + average number of neutrons.
...mass of the protons.
...mass of the neutrons &electrons only
19
An acid is any substance which...
contributes hydroxide ions(OH-) to a solution
contributes hydrogen ions(H+) to a solution
makes a chemical corrosive
has a pH value above 7.
20
What do you call a phase change from gas to solid?
boiling
melting
deposition
sublimation
