This a method to organize the chemical elements that is arranged in order of atomic number. It consists of 118 known elements. Certain elements have been deemed so unstable that they do not have a set atomic mass. Name this famous science classroom tool.
This molecular substance is believed to be the most basic requirement or signature for life to exist on a planet.
Which one of the four basic forces of the universe is most directly involved with maintaining the planets in their orbits?
Name the phenomenon that can sometimes result after a moderate to severe blow to the head.
What is the common name of the members of the Class Aves?
Channels that carry ions made of this element are blocked by some hypertension medications. Ions of this element and magnesium are concentrated in hard water, while its sulfate forms gypsum. Antacids use its carbonate, which forms limestone. Name this element found in dairy products that is used by the body to form teeth and bone structures.
Which of the following is the hottest region of planet Earth:
W) the mantle
X) the inner core
Y) the outer core
Z) the crust
What anatomical structures in humans function by connecting muscles to bones?
What terrestrial planet rotates in an opposite direction to the planet Earth?
This is part of your body’s circulatory system. It’s made up of the atria, ventricles, valves, and various arteries and veins. The main function of this is to keep blood that’s full of oxygen circulating throughout your body. Name the organ that tends to be a bit heavier in a man than a woman.
The density parameter for the non-relativistic form of this falls off with the cube of the scale factor. This substance dominated the universe from approximately 75,000 years after the Big-Bang until about 4 billion years ago. Deviations in the expected orbital speed of galaxies suggests the presence of the "dark" form of this. Name the term that describes a solid, liquid, and gas.
Which of the following is NOT true:
W) compounds have atoms from more than one element
X) atoms can bond together to make molecules
Y) all helium atoms have one more proton than all hydrogen atoms
Z) all oxygen molecules have 8 neutrons
Z) ALL OXYGEN MOLECULES HAVE 8 NEUTRONS
Rounded to the nearest day, the Mercurian year is equal to:
w) 111 days
x) 88 days
y) 50 days
z) 25 days