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
postnew [5]
3 years ago
9

A travel mug of 91∘C coffee is left on the roof of a parked car on a cold winter day. The temperature of the coffee after t minu

tes is given by H=91(2)−t/14. After how many minutes will the coffee be only lukewarm (30∘C)?
Chemistry
1 answer:
GREYUIT [131]3 years ago
3 0

Answer: A

Explanation:

You might be interested in
The electrons in an insulator are tightly bound to their atoms.
Murrr4er [49]
If its a true or false statement . the answer is true 
4 0
3 years ago
Read 2 more answers
Consider the balanced equation:
kakasveta [241]

Answer:

well hello there ms gabby I might not know the answer but you could text me on Ig or sc

ig:wavy_sean5

sc:despeechless5

ur really pretty

5 0
3 years ago
Design a test to determine whether thorium-234 also emits particles. First, explain how Rutherford’s experiment measured positiv
liubo4ka [24]

The characteristics of the α and β particles allow to find  the design of an experiment to measure the ²³⁴Th particles is:

  • On a screen, measure the emission as a function of distance and when the value reaches a constant, there is the beta particle emission from ²³⁴Th.
  • The neutrons cannot be detected in this experiment because they have no electrical charge.

In Rutherford's experiment, the positive particles directed to the gold film were measured on a phosphorescent screen that with each arriving particle a luminous point is seen.

The particles in this experiment are α particles that have two positive charge and two no charged is a helium nucleus.

The test that can be carried out is to place a small ours of Thorium in front of a phosphorescent screen and see if it has flashes, with the amount of them we can determine the amount of particle emitted per unit of time.

Thorium has several isotopes, with different rates and types of emission:

  • ²³²Th emits α particles, it is the most abundant 99.9%
  • ²³⁴Th emits β particles, exists in small traces.

In this case they indicate that the material used is ²³⁴Th, which emits β particles that are electrons, the detection of these particles is more difficult since it has one negative charge, it has much lower mass, but they can travel further than the particles α, therefore, for what type of isotope we have, we can start measuring at a small distance and increase the distance until the reading is constant. At this point all the particles that arrive are β, which correspond to ²³⁴Th.

Neutron detection is much more difficult since these particles have no charge and therefore do not interact with electrons and no flashing on the screen is varied.

In conclusion with the characteristics of the α and β particles we can find the design of an experiment to measure the ²³⁴Th particles is:

  • On a screen, measure the emission as a function of distance and when the value reaches a constant, there is the β particle emission from ²³⁴Th.
  • The neutrons cannot be detected in this experiment because they have no electrical charge.

Learn more about radioactive emission here: brainly.com/question/15176980

7 0
3 years ago
A(n) ____ consists of atoms that have a specific number of protons in their nuclei.
Kamila [148]

Answer:

Solution i think

Explanation:

7 0
3 years ago
What is true of a strong acid? (3 points)
forsale [732]
The answer is A it’s ionizes in water
5 0
3 years ago
Read 2 more answers
Other questions:
  • What role does hydrogen bonding play in liquid water and ice?
    15·1 answer
  • Are pure substances chemically combined​
    8·1 answer
  • An inexperienced chemist adds too little boiling solvent to an impure sample of product and then leaves this mixture to cool. th
    11·1 answer
  • Did I start this right? If not what do I need to do? <br> Thanks x
    8·2 answers
  • During a physical change water can change it's (blank) but it will not change it's (blank).
    12·1 answer
  • The Law of Conservation of Matter describes how mass is not lost during a chemical reaction.
    5·2 answers
  • Why do elements in the same group have a similar reactivity?
    9·1 answer
  • Please help as soon as possible please and thank you.
    5·1 answer
  • Why do oxygen and sulfur have similar chemical properties?
    5·1 answer
  • Radioisotopes are unstable because they contain an excess number of:.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!