Question

Marks: 1


The first species to populate an area where primary succession is taking place are called the __________ species.



Choose one answer.





a. pioneer







b. succession







c. primary

Answer 1

a. pioneer

Answer 2

Marks: 1


Waves that require a medium through which to pass are called electromagnetic waves.


Answer:

True or false

Answer 3

Marks: 1


A substance that tastes bitter, feels slippery, and turns red litmus paper blue is a/an ________.


Choose one answer.





a. indicator







b. base







c. acid

Answer 4

b. base

Answer 5

Each radio and television station is assigned a basic broadcast frequency known as the carrier frequency.


Answer:

TrueFalse

Answer 6

the electromagnetic waves passes without a medium .... therefore its false

Answer 7

Marks: 1


What is the chemical name for the compound with the formula Na2S?


Choose one answer.





a. sodium sulfide







b. magnesium sulfide







c. sodium fluoride

Answer 8

a

Answer 9

Sorry, yes it's false..

Answer 10

Marks: 1


A change that produces a new substance is a chemical change.


Answer:

TrueFalse

Answer 11

true

Answer 12

Marks: 1


Population density is defined as ____________________________.


Choose one answer.





a. the number of individuals moving into a population







b. the number of individuals of a population in a specific area







c. an approximation of a number, based on reasonable assumptions

Answer 13

b

Answer 14

Waves that move the particles of the medium parallel to the direction in which the waves are traveling _____________ waves.



Choose one answer.





a. transverse







b. surface







c. longitudinal

Answer 15

c

Answer 16

Marks: 1


Carbon dioxide (CO2) is an example of a/an __________.


Choose one answer.





a. compound







b. element







c. mixture

Answer 17

a. compound

Answer 18

Marks: 1


Producers release the gas oxygen as a product of photosynthesis.


Answer:

TrueFalse

Answer 19

Okay, I think this is enough... we are doing a test for you?

Answer 20

true

Answer 21

No im writing it down on my paper.. please

Answer 22

its true

Answer 23

please i did half of it i need help im on a time limt only this time??

Answer 24

i have 5 more

Answer 25

ok continue

Answer 26

Marks: 1


Producers release the gas oxygen as a product of photosynthesis.


Answer:

TrueFalse

Answer 27

true

Answer 28

Marks: 1


The frequency of the sound waves produced by a string increases as the tension of the string decreases.


Answer:

TrueFalse

Answer 29

false

Answer 30

What does a neutralization reaction produce?


Choose one answer.





a. bases







b. water and a salt







c. carbonated water



.

Answer 31

b

Answer 32

neutralization results in foramtion of salt and water

Answer 33

Marks: 1


Interference occurs when two or more sound waves interact.


Answer:

TrueFalse

Answer 34

true

Answer 35

Polarized light consists of waves that vibrate in one direction only.


Answer:

TrueFalse

Answer 36

umm not sure about his one but it must be true .....

Answer 37

The atomic number is the number of ______________________.


Choose one answer.





a. valence electrons in an atom







b. protons in the nucleus of an atom







c. neutrons in the nucleus of an atom

Answer 38

b. atomic number = proton number

Answer 39

Yes Hashir it's true...

Answer 40

^^ i know i am a genius ..... and modest too

Answer 41

YOU ARE!!! THANK YOU!

Answer 42

lol yeah :P

Answer 43

@superjennifer: thanx

Answer 44

YEP!!