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
Molodets [167]
3 years ago
10

Which action is the best example of a direct observation

Chemistry
2 answers:
kiruha [24]3 years ago
5 0

The answer is D Determining the seal population of an island by counting seals in 10 square meters of the island on e2020

luda_lava [24]3 years ago
3 0

Since you didn't have any extra information about the question I'll be presenting an example from my own textbooks that I've used.

An example of a direct observation is listening to a cricket chirp at night, and counting the number of chirps per minute.

Direct Observation is where the evaulator watches the subject in their usual habitat without disrupting or altering it.

You might be interested in
What is the wavelength of spectral line resulted from the electron transition from n=3 to n=2 in a hydrogen atom.
MakcuM [25]

Answer:

\lambda=6.56x10^{-7}m

Explanation:

Hello there!

In this case, it possible to use the Rydberg equation in order to calculate the wavelength for this transition from n=3 to n=2 as shown below:

\frac{1}{\lambda} =R_H(\frac{1}{n_f^2}-\frac{1}{n_i^2} )

Thus, we plug in the corresponding energy levels and the Rydberg constant to obtain:

\frac{1}{\lambda} =10973731.6m^{-1}(\frac{1}{2^2}-\frac{1}{3^2} )\\\\\frac{1}{\lambda} =1524129.4m^{-1}\\\\\lambda=\frac{1}{1524129.4m^{-1}} \\\\\lambda=6.56x10^{-7}m

Best regards!

5 0
4 years ago
What is the octet rule
BlackZzzverrR [31]
The octet rule is that atoms must have 8 valence electrons to have an octet. Usually, when atoms have an octet, they tend not to bond with any other atoms because they are already stable and do not need to bond anymore. 
8 0
3 years ago
Read 2 more answers
How many grams of NaOH are in a 225.0 mL sample of a 2.5 M solution of NaOH? (Molar mass of NaOH is 40.0 g/mol)
ladessa [460]

Answer

Approx. 4 g of NaOH.

Explanation:

Concentration

 

=

 

Moles

Volume of solution

Number of moles

 

=

 

Volume

×

concentration  

=

0.250

⋅

L

×

0.400

⋅

m

o

l

⋅

L

−

1

=

 

0.100

⋅

m

o

l

Mass of sodium hydroxide

 

=

 

0.100

⋅

m

o

l

×

40.0

⋅

g

⋅

m

o

l

−

1

=

?

?

⋅

g

Explanation:

6 0
3 years ago
How many electrons does an atom of chromium have
Gre4nikov [31]
Answer: 24 electrons
7 0
4 years ago
Read 2 more answers
A continuous field of bluestem prairie grass is an example of what type of population?
Fed [463]
An ecosystem ( i think)
5 0
3 years ago
Read 2 more answers
Other questions:
  • Someone help me please please someone help me please
    5·1 answer
  • The value of the atomic mass of an atom
    10·1 answer
  • Liquid water and ethanol are described as miscible because they _____.
    13·1 answer
  • A sample contains 1.29×1022 atoms of Cs. Calculate the amount of Cs.
    13·1 answer
  • I had 10 molecules of Ag and an unlimited supply of H2S. How many molecules of Ag2S could I produce?
    15·1 answer
  • When radiometric dating is done on a rock sample, the rock’s is determined.
    14·2 answers
  • What is most likely to refract a beam of light ?
    14·1 answer
  • Xplain why the kidneys are important to our survival. (2 points)
    7·2 answers
  • Examination reveals that 180.2 g/mol of glucose contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen.
    11·1 answer
  • Please help, due 7:00 AM
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!