Positively-charged particles inside an atom are called...
protons
100
The universal solvent is....
water.
100
The atomic number of an atom (even if it is an ion) gives the number of its...
protons.
100
A thermocline refers to the boundary between layers of different....
temperature.
100
Name any of the 4 most abundant elements in living organisms.
Carbon, Hydrogen, Nitrogen, Oxygen.
200
An atom which has gained or lost electrons is called...
an ion.
200
Water molecules stick together, which is called...
cohesion.
200
Sodium, with a valence of 1, combines easily with Chlorine, with a valence of 7. The bond that forms between these two elements is really an attraction between unlike charges and is called a(n) _________ bond.
ionic
200
A pycnocline refers to the boundary between layers of different...
density.
200
DAILY DOUBLE!
A halocline refers to the boundary between layers of different...
salinity.
300
If a neutron is removed from an atom, what is formed?
an isotope.
300
Water molecules stick to other objects/substances, which is called
adhesion.
300
The element Chlorine (Cl) has an atomic number of 17 and atomic mass of 35. How many protons (P), neutrons (N), and electrons(E) will a neutral Chlorine atom have?
17 P, 18 N, 17 E
300
Does hot water freeze faster than cold?
NOOOOOOOOOOOOOOOOOOOOO!
300
In the chemical equation, 2 H2 + O2 --> 2 H2O, which molecules are the reactants ?
2 H2 + O2
400
What bond is formed when electrons are shared between atoms?
covalent bond.
400
The warmest water in the ocean is found....
Near the equator.
400
14. In the periodic table, elements found in the same ________________ have the same reactivity due to the number of electrons in the last energy level (valence).
group/column
400
Sound travels the slowest in this layer.
SOFAR layer.
400
When changing states from solid to liquid, we should consider the
Heat of fusion.
500
Most of the mass of an atom is found...
in the nucleus.
500
Sodium is much more stable as an ion with a +1 charge. This means it has a tendency to (gain/lose) a (proton/electron).
Lose one electron.
500
Give the correct formula for the compound lithium oxide (lithium has 1 valence electron and oxygen has 6 valence electrons).
Li2O (The 2 should be subscript).
500
Why is the ocean blue? You must provide 2 answers.
1) Blue light penetrates the deepest.
2) The water molecule vibrates, absorbing red light and leaving blue for us to see.