Properties of Water, safety, scientific method

Question 1

If a beaker is cracked, you should throw the beaker away in the trash can.

Accepted Answer

False

Question 2

What effect does decreasing the temperature of a room have on a lifespan of a battery. Which variable is bolded?

Accepted Answer

Independent variable

Question 3

Substances with a low pH value

Accepted Answer

are acidic.

Question 4

What should a student do if he finishes his lab?

Accepted Answer

Clean up the lab station.

Question 5

A well tested and scientifically accepted explanation with data backing it up is called a ...

Accepted Answer

Theory

Question 6

In an experiment to determine what type of acid is most corrosive, which of the following must be a controlled variable?

Accepted Answer

The material the acid is poured on

Question 7

Lauren investigates how fast it takes robert to react to different sounds. What is the dependent variable?

Accepted Answer

How much time it took robert to react

Question 8

What is the dependent variable in the graph?

Accepted Answer

Number of Hot Dogs Sold

Question 9

A scientist observes that the chemical reaction produced bubbles. What type of observation is that?

Accepted Answer

Qualitative

Question 10

Why is it important to test one variable at a time?

Accepted Answer

All of the above

Question 11

independent variable

Accepted Answer

the only factor that the scientist purposefully changes

Question 12

What inference can be made from this table?

Accepted Answer

The number of rabbits most likely decreased due to overhunting by the fox

Question 13

How many atoms are in the compound Mg3(PO4)2?

Accepted Answer

13

Question 14

Hydrogen bonds are responsible for which property of water?

Accepted Answer

All answers are correct.

Question 15

Ions have

Accepted Answer

a different number of electrons

Question 16

What's a nonpolar covalent bond?

Accepted Answer

Bonding electrons are equally attracted to both atoms

Question 17

What does this lab safety symbol represent?

Accepted Answer

corrosive chemicals

Question 18

What property of water gives it the ability to dissolve ionic and polar molecules?

Accepted Answer

polarity

Question 19

Attraction between molecules of different substances is called?

Accepted Answer

adhesion

Question 20

What is the substance that is dissolved into a solvent called?

Accepted Answer

a solute

Question 21

Plant leaves turn towards the light coming from a window. What aspect of living things is this describing?

Accepted Answer

Homeostasis, Obtains and uses materials and energy

Question 22

Based on the following data table, what type of graph would you make?

Accepted Answer

Bar

Question 23

Why should an experiment be repeated?

Accepted Answer

to reduce the chance of error

Question 24

Which is NOT a proper lab procedure?

Accepted Answer

handle all the lab equipment

Question 25

Vinegar has a pH of 3 and Coffee has a pH of 5. How much more acidic is vinegar?

Accepted Answer

100x

Question 26

Quantitative data is

Accepted Answer

measuring, or measured by the quantity of something.

Question 27

Attraction between molecules of the same substance is called ...

Accepted Answer

cohesion

Question 28

Based on the following data table, what is the average score?

Accepted Answer

86

Question 29

Which term best describes the chemical bonds between H and O atoms in a singular water molecule?

Accepted Answer

polar covalent

Question 30

A hypothesis is

Accepted Answer

An educated guess yet to be proven

Question 31

To run a controlled experiment on how sleep affects student test scores, you must

Accepted Answer

vary amount of sleep and keep all other variables the same

Question 32

what is a covalent bond?

Accepted Answer

a chemical bond that results from the sharing of valence electrons

Question 33

What is a buffer?

Accepted Answer

A weak acid or base that prevents pH change.

Question 34

Based on the graph, what is true?

Accepted Answer

The lowest drink sales occurred on Wednesday.

Question 35

How are Ionic Bonds formed?

Accepted Answer

transfer of electrons from one atom to another

Question 36

What force allows water to move from the roots up to the stems and leaves of a plant?

Accepted Answer

capillary action

Question 37

Bases have a pH of...

Accepted Answer

Greater than 7

Question 38

Which type of bond chemically bonds 2 or more water molecules together?

Accepted Answer

hydrogen bond

Question 39

What property is caused by the strong attraction between water molecules?

Accepted Answer

surface tension

Question 40

The variable that is measured/collected in an experiment due to a manipulation is the

Accepted Answer

dependent

Question 41

What does this lab safety symbol represent?

Accepted Answer

no flames

Properties of Water, safety, scientific method

Questions 41

Properties of Water, safety, scientific method

Questions 41