In the middle of science class, you have a great idea. being on the fourth floor, you get a friend to watch out the window of the third, second and first floors just beneath you. you have al you friends on a conference call on your cell phone and tell them to let you know when they see a book you drop out you window pass by their window. which statement is true of the amount of time it takes to pass by each window?

a) the time interval between floors is the same.

b) the time interval between floors becomes less each time.

c) the time interval between floors become more each time.

d) the time interval between floors becomes infinitely long.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance