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
Komok [63]
3 years ago
6

How much heat is required to warm 1.40 l of water from 20.0 ∘c to 100.0 ∘c? (assume a density of 1.0g/ml for the water.)?

Physics
1 answer:
marta [7]3 years ago
3 0
The water density is 
d=1.0 g/mL = 1000 g/L
And the mass of 1.40 L of water is
m=dV=(1000 g/L)(1.40 L)=1400 g

The amount of heat needed to increase the temperature of the water by \Delta T is given by
Q=m C_s \Delta T
where m is the water mass, C_s = 4.18 J/g ^{\circ}C is the water specific heat capacity and 
\Delta T=100.0 ^{\circ}C-20.0 ^{\circ}C = 80.0^{\circ}C 
is the increase in temperature. If we substitute these numbers into the equation, we find
Q=(1400 g)(4.18 J/g^{\circ}C)(80.0^{\circ}C)=4.68 \cdot 10^5 J
You might be interested in
1. Which statement about subatomic particles is not true?
igomit [66]

1. Protons and neutrons have the same charge.

Protons have positive charge, equal to e=+1.6\cdot 10^{-19} C, while neutrons have zero charge.

2. mass number

The mass number of an atom is equal to the sum of protons and neutrons inside its nucleus.

3. Atoms are made up of smaller particles.

According to Dalton's theory, atoms are the smallest particles that make matter, and they are indivisible and indestructible, so they are NOT made up of smaller particles.

4. a solid sphere

In Dalton's theory, atoms are not made of smaller particles, so we can think them as solid spheres.

5. J. J. Thomson

In his experiment with cathode ray tubes, JJ Thomson demonstrated the existance of the electrons, which are negatively charged particles inside the atom. In his model of the atom (plum-pudding model), Thomson thought the atom consists of a uniform positive charge and the electrons are located inside this positive charge.

6. An electron has the same amount of energy in all orbitals.

In fact, each orbital corresponds to a different energy level: the farther the orbital from the nucleus, the higher the energy of the electrons contained in that orbital.

7. A hydrogen atom in heavy water has an extra neutron.

Heavy water is a type of water that contains deuterium, which is an isotope of the hydrogen consisting of one proton and one neutron (so, one extra neutron).

8. The glowing beam was always deflected by charged plates

In his cathode's ray tube experiment, Thomson shows that the beam of unknown particles (= the electrons) were deflected by charge plates, so the particles had to be also electrically charged.

9. electrons move to a lower energy level

When electrons move from a higher energy level to a lower energy, they emit a photon (light) of energy equal to the difference in energy between the two energy levels.

10. orbital

In quantum mechanics, electrons in the atom are not precisely located, since we cannot determine their exact position and velocity at the same time. Therefore, we can only describe regions of space where the electrons have a certain probability to be found, and these regions of space are called orbitals.

11. 14

According to Dalton's theory, the proportions of the reactants must be respected in order to form the same compound. Therefore, we can write:

2 g: 4 g = X : 28 g\\X=\frac{2 g \cdot 28 g}{4 g}=14 g

12. negative charge, found outside the nucleus

Electrons are particles with negative charge of magnitude e=-1.6\cdot 10^{-19}C that orbit around the nucleus. The nucleus, instead, consists of protons (positively charged, with charge opposite to the electron) and neutrons (neutrally charged).

13. move from higher to lower energy levels

When electrons move from a higher energy level to a lower energy inside a neon atom, they emit a photon (which is light) whose energy is equal to the difference in energy between the two energy levels.

14. atomic number from its mass number

In fact:

- the atomic number of an atom (Z) is equal to the number of protons inside the nucleus

- the mass number of an atom (A) is equal to the sum of protons+neutrons inside the nucleus

Therefore, we can find the number of neutrons in the nucleus by calculating the difference between A and Z:

Number of neutrons = A - Z

15. None of them

None of these examples is a good analogy to describe the location of an electron in an atomic orbital: in fact, the position of an electron in an orbital cannot be precisely described, we can only describe the probability to find the electron in a certain position, and none of these example is an analogy of this model.

8 0
2 years ago
This image below shows a ship using sonar to map the seafloor. pls help i need this :(
Umnica [9.8K]

Answer:

d and i think a?

Explanation:

im so sorry if its wrong

5 0
3 years ago
What are some of the challenges that you might face if you wanted to observe and study stars from Earth?
schepotkina [342]
<span>The earth moves, which is unstoppable and if the earth moves the telescope won't be able to see it clearly because the telescope needs to be able to move at the same pace as earth to keep up to the objects</span>
7 0
3 years ago
Read 2 more answers
I need help with the second one asap
dangina [55]

Answer:

what I don't know show a question mark me as brainleast

6 0
3 years ago
Read 2 more answers
Who was the 43rd First Lady?
atroni [7]

Answer: After serving as Second Lady from 1981 to 1989, Barbara Pierce Bush served as First Lady of the United States when her husband George H. W. Bush won the Presidency. She is also the mother of the 43rd President, George W. Bush, and of Florida's 43rd Governor, Jeb Bush.

Explanation:

8 0
2 years ago
Other questions:
  • A roller coaster has a mass of 275 kg. It sits at the top of a hill with height 85 m. If it drops from this hill, how fast is it
    11·2 answers
  • A string is wrapped around a uniform disk of mass M = 1.2 kg and radius R = 0.07 m. (Recall that the moment of inertia of a unif
    13·1 answer
  • Juan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most like
    5·2 answers
  • An electric field of magnitude 2.35 V/m is oriented at an angle of 25.0° with respect to the positive z-direction. Determine the
    12·1 answer
  • Why are graphs helpful for displaying data?
    10·2 answers
  • A block slides down a frictionless plane having an inclination of 15.0°. The block starts from rest at the top, and the length o
    14·1 answer
  • A raised plaster cover (often called a plaster ring or mud ring) is permitted to increase the maximum number of conductors permi
    13·1 answer
  • In the winter activity of tubing, riders slide down snow covered slopes while sitting on large inflated rubber tubes. To get to
    6·1 answer
  • Pls heplp 70 points!!!!!
    6·1 answer
  • A student carries a backpack for one mile. Another student carries the same backpack for two miles
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!