1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lakkis [162]
3 years ago
9

Students in Ms. Winters' class were interested in testing the antibacterial strength of hand soap versus hand sanitizer. The stu

dents planned to wash their hands using the sanitizer or soap and warm water for two minutes, then dry their hands with a paper towel. The standard of comparison would be rubbing their hands vigorously for 2 minutes in warm water, without any soap or sanitizer, and then drying with a paper towel. The sanitizer advertisement claimed to kill bacteria more effectively than any soap. After washing, hands would be swabbed and then the swab applied to a culture plate and incubated. Finally, the bacterial cultures would be counted.
What would be an appropriate research question to guide this scientific investigation?
A) What method kills bacteria?
B) Under what conditions does bacteria grow best?
C) Is hand sanitizer more effective in killing bacteria than hand soap?
D) How does using hand sanitizer to kill bacteria compare to using just warm water?
Chemistry
2 answers:
Serhud [2]3 years ago
4 0
I would say <span>C) Is hand sanitizer more effective in killing bacteria than hand soap </span>
KatRina [158]3 years ago
3 0
My answer is a please tell me if I helped
You might be interested in
Balance equation Al(s)+__CuSO4(aq) = ____Al2(SO4)3(aq)+____Cu(s)
Leokris [45]
2Al +3CuSO4=Al2 (SO4)3+3Cu.

is the balanced equation.

HOPE IT HELPS YOU '_'
8 0
3 years ago
Read 2 more answers
Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to b
Lelechka [254]

Answer:

343.98 nm is the longest wavelength of radiation with enough energy to break carbon–carbon bonds.

Explanation:

A typical carbon–carbon bond requires 348 kJ/mol=348000 J/mol

Energy required to breakl sigle C-C bond:E

E=\frac{348000 J/mol}{6.022\times 10^{23} mol^{-1}}=5.7788\times 10^{-19} J

E=\frac{h\times c}{\lambda}

where,

E = energy of photon

h = Planck's constant = 6.626\times 10^{-34}Js

c = speed of light = 3\times 10^8m/s

\lambda = wavelength of the radiation

Now put all the given values in the above formula, we get the energy of the photons.

\lambda =\frac{(6.63\times 10^{-34}Js)\times (3\times 10^8m/s)}{5.7788\times 10^{-19} J}

\lambda =3.4398\\times 10^{-7}m=343.98 nm

1 m = 10^{9} nm

343.98 nm is the longest wavelength of radiation with enough energy to break carbon–carbon bonds.

4 0
3 years ago
An indicator is_____ Select all that apply.
crimeas [40]

Answer: C

Explanation:

Indicators are organic weak acids or bases with complicated structures.

5 0
2 years ago
The eye is a substance of which major body system
ozzi

Answer:

the visual system would be the answer

5 0
2 years ago
PLEASE ANSWER
lana [24]

Answer: option D. Their speed in a vacuum

Explanation:

Electromagnetic waves all have same speed in vacuum. This speed has been calculated to be 3x10^8m/s.

3 0
3 years ago
Other questions:
  • What is the threshold frequency ν0 of cesium?
    11·1 answer
  • A balloon has a volume of 6.2 liters at 23.2 C. The balloon is then heated to a temperature of 144.0 C. What is the volume of th
    12·1 answer
  • In the following reaction, which species is reduced? 2k+br2 yield 2k+ + 2br-
    12·1 answer
  • How many grams of Cl are in 525g of CaCl2
    7·1 answer
  • Consider the balanced chemical equation for the combustion of methane (CH4).
    5·2 answers
  • i don't need these solved I just need the steps to solve it and. what these problems in chemistry would be called so I can look
    8·1 answer
  • The electron cloud of HF is smaller than that of F2, however, HF has a much higher boiling point than F2 has. Which of the follo
    13·1 answer
  • 17. Is the scientific method suitable for solving problems only in<br> the sciences? Explain.
    11·1 answer
  • Matthew records the temperature outside for one day. From 10:00 a.m. to 12:00 p.m., the
    11·1 answer
  • Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!