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
harina [27]
3 years ago
13

Element A has a half-life of 10 days. A scientist measures out 200 g of this substance. After 30 days has passed, the scientist

reexamines the sample.
How much Element A will remain in the sample?

50 g
25 g
12.5 g
100 g
Chemistry
2 answers:
Monica [59]3 years ago
6 0

Answer:

25 g of an element will remain in  the sample.

Explanation:

Initial mass of an element = N_o = 200 g

Final mass of an elemnt after time ,t = N

t = 30 days

Half life of an element =t_{\frac{1}{2}=10 days

\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{10 days}=0.0693 days^{-1}

\log[N]=\log[N_o]-\frac{\lambda t}{2.303}

\log[N]=\log[200 g]-\frac{0.0693 days ^{-1}\times 30 days}{2.303}

N = 25.01 49 g ≈ 25 g

25 g of an element will remain in  the sample.

myrzilka [38]3 years ago
4 0
N=N₀*2^(-t/T)

N₀=200 g
T=10 d
t=30 d

N=200*2^(-30/10)=25 g

25 g will remain
You might be interested in
Carboxyhemoglobin may be formed when a person inhales air that contains
elena-14-01-66 [18.8K]
Answer is none of the above
5 0
3 years ago
Explain whether or not you expect the chaparral biome to be sensitive to the loss of a single species.
aleksley [76]

Answer:

See the answer below

Explanation:

The chaparral biome is a temperate biome with a characteristic high temperature and dryness during summer and mild rainy winters and springs. The biome can be found in relatively small amounts in the major continents of the world with its rich plant and animal diversity who have successfully adapted to the conditions of the biome.

Due to the high biodiversity of the chaparral biome, <u>one would expect it to be resilient to the loss of a single species.</u> <em>The more the biodiversity of a biome or community, the more resilient such biome or community would be to the loss of species and lower the biodiversity, the more sensitive the community would be to the loss of species. </em>

3 0
3 years ago
How do properties of waves affect light and sound
Iteru [2.4K]

Answer:

Explanation:

Both light and sound can be described in terms of wave forms with physical characteristics like amplitude, wavelength, and timbre. Wavelength and frequency are inversely related so that longer waves have lower frequencies, and shorter waves have higher frequencies.

4 0
3 years ago
All compounds are molecules but not all molecules are compounds. Explain this statement.
Elis [28]
All compounds are molecules because a molecule is 2 or more substances/elements combined and a compound is 2 or more elements combined. But not all molecules are elements because some molecules are just combined substances with no elements combined at all.
5 0
3 years ago
Resources that are not able to be reproduced as quickly as they are used are called _____.
Maurinko [17]

Answer:

C) non renewable resources

Explanation:

These are resources such as oil that are formed over a long period of time but are consumed very quickly.

8 0
2 years ago
Other questions:
  • IN A TEST! NEED HELP
    10·2 answers
  • Consider a hypothetical reaction in which a and b are reactants and c and d are products. if 25 grams of a completely reacts wit
    7·1 answer
  • Which of the following statements best explains the trends in boiling points?
    10·2 answers
  • HELP ASAP! In what phase do molecules flow but still remain close together? A. Solid B. Liquid C. Gas D. None
    5·1 answer
  • What volume will water vapor form when 40 liters of hydrogen completely reacts with 25 liters of oxygen? Assume the temperature
    8·1 answer
  • Nonmetallic elements form ions by _____ valence electrons to complete their outer shell.
    12·1 answer
  • Mutations in genes encoding cell signaling proteins contribute to many cancers. For example, a chromosomal translocation fuses t
    9·1 answer
  • The atomic mass of a atom determines by what?
    6·1 answer
  • Is the following statement true or false solar panels collect energy from the sun and power a lamp and home Is the following sta
    13·2 answers
  • Help please!! I'll name you brainliest!!
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!