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
Zolol [24]
3 years ago
12

A sample of cold water was mixed with a sample of hot water inside a calorimeter, and the final temperature of the cold water wa

s 40 °C. Which statement is true about the hot water in the calorimeter? It absorbed 40 joules. It absorbed 80 joules. Its final temperature was 80 °C. Its final temperature was 40 °C.
Chemistry
2 answers:
RSB [31]3 years ago
4 0

Answer: One technique we can use to measure the amount of heat involved in a chemical or physical process is known as calorimetry. Calorimetry is used to measure amounts of heat transferred to or from a substance. To do so, the heat is exchanged with a calibrated object (calorimeter). The change in temperature of the measuring part of the calorimeter is converted into the amount of heat (since the previous calibration was used to establish its heat capacity). The measurement of heat transfer using this approach requires the definition of a system (the substance or substances undergoing the chemical or physical change) and its surroundings (the other components of the measurement apparatus that serve to either provide heat to the system or absorb heat from the system). Knowledge of the heat capacity of the surroundings, and careful measurements of the masses of the system and surroundings and their temperatures before and after the process allows one to calculate the heat transferred as described in this section.

Explanation:

marta [7]3 years ago
3 0

Answer: Option (d) is the correct answer.

Explanation:

Since it is given that temperature of hot water is 40 degree celsius. So, when cold water is added into it then it will absorb heat from the hot water and hence, temperature of cold water will become equal to 40 degree celsius.

Therefore, a thermal equilibrium will be maintained as temperature of both hot and cold water becomes equal. In thermal equilibrium, hotter body loses the heat and colder body absorbs the heat.

Therefore, we can conclude that the true statement about the hot water in the calorimeter is its final temperature was 40^{o}C.

You might be interested in
Help asap
alisha [4.7K]

Answer: Option (b) is the correct answer.

Explanation:

It is known that metals are the species which readily lose an electron and tend to attain a positive charge.

For example, atomic number of sodium is 11 and its is an alkali metal. It electronic distribution is 2, 8, 1.

And, in order to attain stability it readily loses an electron and thus it become Na^{+} ion.

Also, it is known that species which tend to transfer or donate their valence electrons to other atoms tend to form ionic bond and the compound formed is known as ionic compound.

Therefore, we can conclude that the statement metal atoms held together by ionic bonds best describes a metal solid.

4 0
3 years ago
Which of the following is an incorrect way of rearranging the density formula:
goldenfox [79]
We know that density = mass /volume
so
mass=volume*density
volume=mass/density
so c is wrong
5 0
3 years ago
Read 2 more answers
A diesel truck produces 47.5kJ of useful output energy from 125kJ of diesel fuel.what is the truck efficiency?.show the solution
Alex Ar [27]
You have to do a report :
\frac{E_f}{E_i} =  \frac{47,5}{125} = 0,38

So the truck efficiency is 38%.
7 0
3 years ago
B. Calculate how many atoms of hydrogen are in 1. 75 moles of glucose (c6h12o6).
ycow [4]

Answer:

1.26x10^25 atoms of hydrogen

Explanation:

because there are 12 atoms of hydrogen in a molecule of glucose, multiply 12 by Avogadro's number (6.02x10^23) to get how many molecules of hydrogen there are in a mole of glucose. Then multiply that number by 1.75, which is the number of moles of glucose there is in this problem.

4 0
2 years ago
Which one of the following compounds is not covalent?
denpristay [2]
KCI is not a covalent compound, it is an ionic compound. 
A covalent compound is one in which each of the atoms involved contribute a specific number of electrons for sharing in order to from stable compound while an ionic compound is a compound formed when one atom donates electron to the other atom in the compound, in order to attain stability.  The compounds given in options A, B and D shared electrons while in KCl, potassium donates an electron to chlorine.
5 0
3 years ago
Read 2 more answers
Other questions:
  • What mass of Cu(s) would be produced if 0.40 mol of Cu2O(s) was reduced completely with excess H2(g) ?
    10·1 answer
  • A substance containing atoms of two or more different elements chemically bonded together is called what
    14·1 answer
  • What is true about two neutral atoms of the element gold
    6·1 answer
  • The chemical hazard label indicates the class of hazard. It uses three major color-coded categories: Health (yellow), Flammabili
    9·1 answer
  • What mass is 2.4E25 molecules of NaHCO3?
    5·1 answer
  • Given the following reaction and data, A + B → Products
    8·1 answer
  • Which statement is true about this reaction?
    15·2 answers
  • What type of factors affect the speed of light? explain
    7·1 answer
  • What is the third largest asteroid in the asteroid belt with a diameter of 267 miles
    10·2 answers
  • Oxygen
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!