Maria wants to determine which type of disinfectant kills the most bacteria.

Which of the following is the best way for Maria to determine this?
A.
Interview ten different people to determine which type of disinfectant they prefer.
B.
Put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate.
C.
Ask ten different companies that make disinfectants which type is best.
D.
Put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

Answers

Answer 1

A I think thats what I would put


Related Questions

Which molecule is the most polarizable?
N₂
O2
CH4
CO2

Answers

Answer:

CO2 I was wrong about methane

I have a test in chem soon can any one help me?

Answers

Answer:

I will be glad to

in your own words describe the process of a physical change​

Answers

Answer:

A physical change is when the form of an object changes, but the substance stays the same.

Example: Ice melting into water.

Dashawn has to find the volume of his phone for science
class. He uses a ruler to measure its length, width, and
height and finds the following:
| = 17 cm
w = 7.5 cm
h = 0.8 cm
What is the volume of Dashawn's phone?

Answers

Answer: Volume of rectangle = L * W * H

Explanation: Multiply the 3 numbers together

Answer:

volume = L x W x H

V= 17 x 7.5 x 0.8

V = 102 cm^3

Explanation: Multiply the three number.

To find the volume, you multiply length times width times heigh

help quick please?????

Answers

Answer:

the core

Explanation:

Answer:

3rd option, the core.

Explanation:


Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K

Answers

16) 100- 273= -173°celsius

17) -73°Celsius

18) °Celsius

19) 77°Celsius

Hi :)

16) 100°K= 100K − 273.15 = -173.1°C

17) 200°K= 200K − 273.15 = -73.15°C

18) 273°K= 273K − 273.15 = -0.15°C

19) 350°K= 350K − 273.15 = 76.85°C

Hope this helps :)

what are twoparts of an atom

Answers

The answer is neutrons and protons.

Hope you got it!!

If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day? winks/day.​

Answers

Answer:4,800

Explanation:

5 winks a minute, 60 minutes in an hour.

300 winks an hour, 16 hours a day.

4,800.

Answer:

The answer is 4,800 winks per day.

Explanation: There are 24 hours in a day, 24 minus the 8 hours shes asleep is 16. There are 60 minutes in an hour. 5 x 60 is 300. 300 winks an hour multiplied by the 16 hours she's awake is 4,800.

if there is a sample 50 grams of naoh how many grams are na

Answers

Answer:

Which number is IRRATIONAL? A) √12 B) √36 C) √64 D) √144

Explanation:

A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the student's percent error? Identify the element. What is the boiling of this element in Celsius degree

Answers

Answer:

Explanation:

percentage error = error  x 100 / correct value

= (2.73 - 2.70) x100 / 2.70

= 1.11 %

The element is Aluminium whose density is 2.702 grams / cc

Boiling point of Aluminium = 2519⁰C .

PLZZ HELP!!
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
23
22
O 12
O 11

Answers

Answer:

12

Explanation:

23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.

Look for other families of ions in the table that follow a pattern similar to that of the polyatomic chlorine ions. Then complete the statement to describe what you find. Select the correct answer from each drop-down menu. Families of ions that contain hydrogen pattern similar to that of the polyatomic chlorine ions. then complete the statement to describe what you find ​

Answers

Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.

Explanation: Plato

Answer:

Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.

Explanation: Plato

Solids are usually: equal in density to other phases more dense than liquids less dense than gases

Answers

Answer:

more dense than liquids

Explanation:

Pleaseee help it’s timed!!

Answers

Answer:

voliiviloou

Explanation:

volaiviolu

Answer:

Rows

Explanation:

Which is a base unit used in the metric system?

Answers

Answer:

Quarts Litres Pints Degrees Fahrenheit.

ASK for more

Answer:

d

Explanation:

Wich statement best describes the progress of science

Answers

Answer:

Scientific ideas are changed when better ones are found.

Explanation:

Bonus question #2: Unknown element, Element X, exists in nature as two isotopes:
^{351}
351

X has a mass of 350.9196 u and
^{353}
353

X has a mass of 352.9209 u. The average atomic mass of Element X is 351.96 u. Calculate the relative abundance of the two Element X isotopes.

Answers

Answer:

Explanation:

your answer is 351.96 i not a 100 per sent right but that should be it

i must be present in a compound for it considered organic

Answers

Answer:

Carbon

Explanation:

Organic compounds must contain carbon. They also usually contain hydrogen,  oxygen, and often nitrogen and other compounds such as phosphorus.

Nearly all organic compounds contain carbon-hydrogen bonds.

Which of the following is the best structure for CH2O2? Explain your reasoning.

Answers

Answer:

I'm guessing structure 1

Answer:

no

Explanation:

no

name two units for density? I need help!!!!

Answers

Answer:

Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth ’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in MKS or SI units). For example, the density of air is 1.2 kilograms per cubic metre.

Explanation:

A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.

Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance

Answers

Answer:

C, Mixture

Explanation:

Answer:

the correct answer is actually D pure substance

Explanation:

WILL GIVE 5 STAR RATING AND BRAINLIEST IF YOU ANSWER FIRST AND CORRECTLY

What are the total number of elements in C₄H₉OH ?

Answers

Theres three elements i'm assuming. C (carbon), H (hydrogen), O is Oxygen.

The __________________ in a chemical formula tells you how many atoms you have of a particular element.
chemical symbols
arrow
subscript
coefficient

Answers

I believe the answer is subscript

A mixture that is uniformly mixed is called __. a homogeneous b heterogeneous c suspension d colloid

Answers

Answer:

a. homogenous

Answer:  A. homogeneous

Explanation: A mixture that is uniformly mixed is called homogeneous.

Plz mark brainliest:)

This chart shows characteristics of three different types of atoms.

A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?

Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.

Answers

Atom X will accept electrons from Atom Y.

Answer:

B) Atom X will accept electrons from Atom Y.

Explanation:

because X has 6 electrons and Y has 2 it would make sense for Y to give to X

Science investigation skills

Answers

People conduct scientific investigations by formulating a hypothesis and observing the results. They then draw conclusions from those results and then share those conclusions with the larger scientific community.

Which of these elements has an electron configuration of [Kr]5s2?
barium

calcium

rubidium

strontium

Answers

Strontium has an electron configuration of [Kr]5s²

Further explanation  

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is  

s: 2 electrons  

p: 6 electrons  

d: 10 electrons and  

f: 14 electrons  

From an electron configuration of [Kr]5s² can be concluded :

element is in period 5 (5 = shell)element is group 2(valence electron =2 and block s) has atomic number 38 (Kr = 36 + 2(valence elektron from 5s²)

If we look at the periodic system, the elements that meet the requirements in question are Strontium (Sr)

Answer:

D) strontium

You are an employee at "cash for gold" and a customer comes in looking to exchange gold for money. They claim to have 3.47 gram nugget of fold. How many particles (atoms) of gold are in one nugget? With work shown

Answers

Answer:

The number of atoms in 3.47 gram nugget of gold is approximately 1.0606 × 10²² atoms

Explanation:

The given mass of gold = 3.47 grams

The molar mass of gold = 196.96657 g/mol

The number of moles of gold in 3.47 grams of gold = 3.47 grams/(196.96657 g/mol)

The number of moles of gold in 3.47 gram nugget of gold = 0.01762 moles

The number of atoms in one mole of gold = 6.02 × 10²³ atoms

The number of atoms in 0.01762 moles of gold = 6.02 × 10²³ atoms/mole × 0.01762 moles

The number of atoms in 0.01762 moles of gold ≈ 1.0606 × 10²² atoms

∴ The number of atoms in 3.47 gram nugget of gold ≈ 1.0606 × 10²² atoms.

compare and contrast gymnosperms and angiosperms

Answers

(JSYK: this is technically biology)

Anyways, a gymnosperm is a plant (usually a tree) that has unprotected seeds, this means it bears no fruits and can include (but are not limited to) connifers, cycads, and the ginko. Angiosperms produce flowers to help fertilization and have protected seeds. They are also likely to produce fruits or vegetables.

Hope this helps, if not, comment down below please!!!

_____ means to make the body well again

Answers;

A. Body Repair
B. Energy
C. Growth
D. Motion. (Which One is it??)

Answers

Answer:

I'm pretty sure it's body repair But it also maybe energy

Explanation:

Answer: A.

Explanation:

the science or study of how man and animals perform tasks and solve certain types of problems involving use of the body.

Hope this helps!....(bruh this was tuff)

Other Questions
no matter how many terrorists we kill or how much territory we reclaim the group can continue to inspire the angry. what does it mean by the group can continue to inspire the angry Think back in your notes: What were ways or tactics that segregationist used to prevent Black Americans from participating in the voting process? can someone please answer me this question ASAP!!!!Point A is located at negative 4 over 6 and point B is located at negative 1 over 6. What is the distance between points A and B? negative 4 over 6 minus negative 1 over 6 = negative 3 over 6; therefore, the distance from A to B is absolute value of negative 3 over 6 equals negative 3 over 6 units negative 4 over 6 minus negative 1 over 6 = negative 3 over 6; therefore, the distance from A to B is absolute value of negative 3 over 6 equals 3 over 6 units negative 4 over 6 plus negative 1 over 6 = negative 5 over 6; therefore, the distance from A to B is absolute value of negative 5 over 6 equals 5 over 6 units negative 4 over 6 plus negative 1 over 6 = negative 5 over 6; therefore, the distance from A to B is absolute value of negative 5 over 6 equals negative 5 over 6 unitsQuestion 7(Multiple Choice Worth 1 points) how many atoms does ba(no3)3 have Complete the sentence with ser o estates correct conjugation t (ser) estudiante en la escuela Chapel Hill soy was the wrong answer Which soclal scientist would be most likely to work on understanding and interpreting the past? Thoughts on ACAB?????? Hi I really need help The roots of a quadratic equation are 1/ 3 and -2. Determine the equation Drag each tile to the correct box.Match each cultural region to the correct description. A negative to the use of social media is _____ a. it provides information as it happened b. it can be unverified and inaccurate c. it can influence government action find the sum . red is negatives and yellow are positives When playing a track on the outer edge, a CD rotates 300 times perminute. Through how many degrees does it rotate in one second? The First Amendment protects which rights? Select all that apply. PLSSSSSSSSSSSS HEEEEEEEEEEELPAre all calories the same?Consider the following two questions as you make up your mind. Are 500 calories from two slices of pizza the same as 500 calories from vegetables? Are you able to eat more calories and still have the same body composition if you eat healthy food?Using your answers to the previous two questions, discuss why you believe all calories are the same, or why you do not believe all calories are the same. please help if oyu help then i get a good grade FIND THE UNIT OF X 5X+17=7 WHEN YOU FIND IT SIOLVE THE EQUATION WITH THE NEW NUMBER OF X Need help with this problemm Fiften is 30 percent of what number? Why in the crusades would so many people be executed at once?