General Science Flashcards
A convex mirror ___ light waves; a convex lens ___ lightwaves.
diverges; converges;
What is the difference between a physical change and a chemical change?
A physical change may alter the form, size, and / or shape of matter; a chemical change alters its molecules.
An acid gives up___ charged hydrogen ions when dissolved in water.
positively
This is the element box of Chlorine within the periodic table of elements. What do the numbers 17 and 35.5 indicate?
The atomic number is 17; there are 17 protons in a chlorine atom’s nucleus and 17 electrons in the electron cloud. The atomic mass of chlorine is 35.5.
The speed of light in a vacuum is approximately ___ meters per second.
300 million.
The diaphragm is a system of muscles that allows ___.
breathing.
The state of matter occuring at lower temperatures is the ___ state.
solid.
Put these in order to describe how blood flows from the heart to the body; body, left atrium, right ventricle, left ventrical, lungs, right atrium.
right atrium, right ventrical, lungs, left atrium, left ventricle, body
When gentetic signals in a cell fail to tell it to stop reproducing, the result may be ___.
cancer.
A type of matter is classified as an element when ___.
It cannot be seperated into different types of matter by ordinary chemical methods.
What is a vector quantity?
a quantity defined by both a magnitude and a direction.
Which two bodily functions are enhanced by calcium?
bone growth; muscle function.
The asteroid belt closest to the Earth lies between which two planets?
Mars and Jupiter.
Why are the four planets closest to the Sun called the terrestrial planets?
The composition of these planets is similar to that of Earth.
Earth is approximately ___ years old.
4.6 Billion
