Question

Can someone help me with a pre-test?

Answer 1

sure whats the question?

Answer 2

theres a few ive got lkike 5 done out of the 14 questions

Answer 3

Alright I will be here to answer :)

Answer 4

oky doky ill just tell you the answer i think then you can check is that ok?

Answer 5

Yep

Answer 6

Which one of these characterizes a hydrophilic substance---a substance that is easily mixed with water?
Substances that are polar in nature
Substances that are non-polar in nature
Substances that are inert in nature

Im pretty sure its A

Answer 7

Yes sure

Answer 8

hydrophilic substances are polar.

Answer 9

so i was right?

Answer 10

yes A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. The dipoles do not cancel out resulting in a net dipole. Due to the polar nature of the water molecule itself, polar molecules are generally able to dissolve in water.

Answer 11

Which component in a graph indicates an independent factor?
Y-axis
X-axis
Scale

I think its the X axis

Answer 12

your score went up! : D

Answer 13

correct In epidemiology, most graphs have two scales or axes, one horizontal and one vertical, that intersect at a right angle. The horizontal axis is known as the x-axis and generally shows values of the independent (or x) variable, such as time or age group. The vertical axis is the y-axis and shows the dependent (or y) variable, which, in epidemiology, is usually a frequency measure such as number of cases or rate of disease. Each axis should be labeled to show what it represents (both the name of the variable and the units in which it is measured) and marked by a scale of measurement along the line.v

Answer 14

Which one of the following would be a good tool to represent data in terms of percentage of a whole?
Pie chart
Line graph
Scatter plot

I think its the pie chart

Answer 15

But are you talking about epidemiology? It doesn't make an actual difference but I was just wondering.

Answer 16

yes i think it was reffering to thst becaue its biolgy
\

Answer 17

biology*

Answer 18

Okay this one i'm not too sure about it's really hard to explain but I suggest scatter plot but I may be wrong:/

Answer 19

one sec i search it up

Answer 20

I would say a Pie Chart. It is usually divided by percentages of a whole (100)

Answer 21

I thought so.

Answer 22

^ that sounds right but maybe not

Answer 23

yes because each percentage becomes a separate dot

Answer 24

Which of these chemicals contains a carbon–carbon double bond?
C2H6
C2H4
C2H2

Im pretty sure its C2H4

Answer 25

A carbon atom binds 4 times with other atoms. So it binds once, twice or three times with another carbon atom or with hydrogen (It can bind with other atoms of course, but it doesn't in these examples).

So, in A the carbon has bond with another carbon and three hydrogen atoms.
In C, the carbon is triple bond with another carbon, and one hydrogen atom.
So B is correct: each carbon atom is bond with two hydrogen atoms and one double carbon bond.

Answer 26

i think theres like 4 more quiestions

Answer 27

alright I have nothing better to do haha

Answer 28

Carbon atom is tetravalent in nature. How many hydrogen atoms can bind to one carbon atom?
Four
Six
Two

I think its four

Answer 29

I really don't have a good explanation but yes you are correct is is four.

Answer 30

your score went up by 1 again

Answer 31

Thanks:)

Answer 32

anymore questions?

Answer 33

Water obtained from natural resources does not show neutral pH. What is the reason behind this?
The neutral nature of water changes due to its ability to dissociate into H+ and OH- ions.
The neutral nature of water changes due to mixing of various salts, bases, and acids, thus changing its pH.
The neutral nature of water changes due to mixing of other neutral substances, thus changing its pH.

I think its B

Answer 34

3 more after this.

Answer 35

The neutral nature of water changes due to mixing of various salts, bases, and acids, thus changing its pH.

Answer 36

Amelia is working with two chemical solutions in her chemistry laboratory. Solution A neutralizes an acidic solution and solution B neutralizes a basic solution. What kind of solutions are solutions A and B?
Solution A is a base and solution B is an acid.
Solution A is an acid and solution B is a base.
Solution A is a salt and solution B is a base.

I thnik its A

Answer 37

It's A
The base neutralizes the acid, the acid neutralizes the base

Answer 38

2 more if thsts okay?

Answer 39

yep i'll be here all day

Answer 40

Muddy water contains microorganisms, clay, and silt. Which of the following statements suggests that muddy water is a suspension?
It is a heterogenous mixture and particles settle down if left undisturbed.
It is a heterogenous mixture and particles do not settle down.
It is a homogenous mixture and particles settle down if left undisturbed.

I think its B

Answer 41

correct its b

Answer 42

An atom has an atomic number 17 and atomic mass number 35. How many neutrons are present in its nucleus?
17
18
35

Im not sure about this one

Answer 43

I think maybe its B

Answer 44

Neutrons = Mass number - Atomic number

Answer 45

now try and figure it out with that equation hope it helped:)

Answer 46

ok