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
sleet_krkn [62]
3 years ago
11

A sample of water is cooled from 45°C to 35°C by the removal of 84 Joules of heat. What is

Chemistry
1 answer:
muminat3 years ago
4 0

Answer:

m = 2 g

Explanation:

Given data:

Initial temperature = 45°C

Final temperature = 35°C

Heat evolved = 84 j

Mass of water = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

specific heat capacity of water is 4.18 J/g.°C

ΔT = 35°C - 45°C

ΔT = - 10°C

84 j = m ×4.18 J/g.°C ×- 10°C

84 j = m × -41.8 J/g

m = 84 j / -41.8 J/g

m = 2 g

negative sign shows heat is evolved.

You might be interested in
Differentiate the claims made by science from those based on bias.
Readme [11.4K]

Answer:

Scientists seek to eliminate all forms of bias from their research. However, all scientists also make assumptions of a non-empirical nature about topics such as causality, determinism and reductionism when conducting research. Here, we argue that since these 'philosophical biases' cannot be avoided, they need to be debated critically by scientists and philosophers of science.

Explanation:

Scientists are keen to avoid bias of any kind because they threaten scientific ideals such as objectivity, transparency and rationality. The scientific community has made substantial efforts to detect, explicate and critically examine different types of biases (Sackett, 1979; Ioannidis, 2005; Ioannidis, 2018; Macleod et al., 2015). One example of this is the catalogue of all the biases that affect medical evidence compiled by the Centre for Evidence Based Medicine at Oxford University (catalogueofbias.org). Such awareness is commonly seen as a crucial step towards making science objective, transparent and free from bias.

6 0
3 years ago
What is the volume of an alka seltzer tablet
Delicious77 [7]

Answer:

Explanation:

Alka Seltzer tablet contains 325 mg of aspirin (acetylsalicylic acid), 1000 mg of citric acid, and 1916 mg of sodium bicarbonate. The acids originally contained in a tablet give only 17.4 mmol of H+, which is not enough to neutralize all of the sodium bicar- bonate (22.8 mmol).

3 0
3 years ago
Read 2 more answers
All three of the phosphorus-fluorine single bonds in pf3 are polar. in which direction should the polarity arrows point?
nydimaria [60]
One of the causes of polarity is the unequal forces of the dipole forces due to differences in electronegativity. The more electronegative molecule tend to attract electrons, hence the polarity arrows point towards it. The electronegativity of Phosphorus and Fluorine is 2.19 and 3.98, respectively. Thus, it points outward towards the fluorine atoms.
3 0
3 years ago
A person has a mass of 63.4kg. What is the weight in pounds?
Evgen [1.6K]
If a person weighs 63.4 KG they will weigh 139.773 but if you estimate it which in most cases you do it would be 139.8 :)
3 0
1 year ago
Tcs food that stay in the tempature danger zone for 4 hours or longer
Fittoniya [83]
What are you trying to ask??????
3 0
3 years ago
Other questions:
  • The device shown operates based on a capacitive touch screen. This means that it utilizes an electric current to operate. Why wi
    10·2 answers
  • Which descriptions apply to eukaryotic cells? Check all that apply.
    7·1 answer
  • A wave at sea travel with a velocity of 25 m/s. If it has a wavelength of 10 m, what is it’s frequency?
    13·1 answer
  • 1 Fuel with higher calorific value are considered efficient fuel. why?<br> 2
    8·2 answers
  • When you combine chocolate powder and milk, the result is best describe as
    8·2 answers
  • What is the daily cost of incandescent lamp
    13·1 answer
  • Help please please please please
    10·1 answer
  • Sulfur has 4 isotopes listed below. Using a periodic table, which isotope is most likely to be the most common isotope? A) sulfu
    10·1 answer
  • What is the formula for Disulfur Pentafluoride?
    12·1 answer
  • Whats Fe2O3 compound name
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!