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
liraira [26]
3 years ago
7

Object A at 40ºC and object B at 80ºC are placed in contact with each other. Which statement describes the heat flow between the

objects?
A)Heat flows from object A to object B.B)Heat flows from object B to object A.C)Heat flows in both directions between the objects.D)No heat flow occurs between the objects.
Chemistry
2 answers:
Arada [10]3 years ago
6 0
By the second law of thermodynamics:
Heat can not spontaneously flow from cold regions to hot regions without external work being performed on a system.
Heat transfer is the passage of thermal energy from a hot ( t B = 80° C ) to a colder body ( t A = 40° C ). 
Answer:  B ) Heat flows from object B to object A.
ozzi3 years ago
5 0
Option B is right that is Heat flows from object <span>B </span>to object because if 2 bodies have different temperature so heat always transfer from higher to lower ,from hot to cold .
You might be interested in
Describe what happens when ionic and covalent (molecular) substances dissolve. Fill in the blanks using the options below:covale
Lena [83]

1. ionic compound ,  aqueous cations  and aqueous anions

2. covalent compound aqueous covalent compound

<u>Explanation:</u>

1. A(n) <u>ionic compound </u> dissolves in water , H₂O(l), will produce <u>aqueous cations </u> and <u>aqueous anions </u>in solution.

When NaCl dissolves in water it will produce Na⁺ and Cl⁻ ions in solution

2. A(n) <u>covalent compound </u> dissolves in water , H₂O(l), will produce <u>aqueous covalent compound </u>in solution.

When Ammonia (NH₃) dissolves in water it forms aqueous ammonia, NH₃(aq)

Organic compounds, like carbohydrates,  proteins, nucleic acids, and lipids, are all good examples of covalent compounds.

3 0
3 years ago
pH is a logarithmic scale used to indicate the hydrogen ion concentration, [H+], of a solution: pH=−log[H+] Due to the autoioniz
Sophie [7]

Answer:

pH = 2,4

Explanation:

pH is defined as a measure of acidity or alkalinity of a solution based on H⁺ concentration

The HCl dissociates in water thus:

HCl → H⁺ + Cl⁻

That means that moles of HCl are the same than H⁺.

0,35gHCl\frac{1mol}{36,46g} = 9,6x10⁻³ moles HCl ≡ moles H⁺

H⁺ molarity is: \frac{9,6x10^{-3}moles}{2,5L} = 3,84x10⁻³M

As pH = -log [H⁺]

<em>pH = 2,4</em>

I hope it helps!

7 0
3 years ago
How many atoms are in 3.5 moles of He?
Volgvan

Answer:

The answer is 2.107 × 10²⁴ He atoms

Explanation:

To find the number of atoms given the number moles we use the formula

<h3>N = n × L</h3>

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

N = 3.5 × 6.02 × 10²³

We have the final answer as

<h3>2.107 × 10²⁴ He atoms</h3>

Hope this helps you

4 0
3 years ago
assume that a water balloon has the same number of water molecules as a helium balloon has helium atoms. If the mass of the wate
Aloiza [94]

Answer : The mass of the water molecule is 4.5 times greater than the mass of the helium atom.

Explanation :

Assumption : The number of water molecules is equal to the number of helium atoms

Given : The mass of water = 4.5 × The mass of helium     ........(1)

The mass of Water = Mass of 1 water molecule × Number of water molecule

The mass of Helium = Mass of 1 helium atom × Number of helium atom

Now these two masses expression put in the equation (1), we get

Mass of 1 water molecule × Number of water molecule = 4.5 × Mass of 1 helium atom × Number of helium atom

As per assumption, the number of water molecules is equal to the number of helium atoms. The relation between the mass of water molecule and the mass of helium atom is,

Mass of water molecule = 4.5 × Mass of helium atom

Therefore, the mass of the water molecule is 4.5 times greater than the mass of the helium atom.

3 0
3 years ago
Choose the correct name for each acid. Click here
Zigmanuir [339]

Answer:

1. Nitrous Acid

2. Hydroiodic Acid

3. Phosphoric Acid

Explanation:

Just did the lesson

7 0
3 years ago
Read 2 more answers
Other questions:
  • In certain species of roses, white roses and red roses are incompletely dominant to each other.When a red rose and a white rose
    13·1 answer
  • A librarian is interested in the numbers of books that visitors check out from the library. She examines the checkout records of
    6·2 answers
  • The atoms and molecules in a liquid are in constant motion. As temperature decreases, what is true of the particles in the liqui
    12·1 answer
  • 1) Ammonium cyanate, NH4CNO, in aqueous solution isomerizes gradually producing urea, H2NCONH2, according to the reaction
    5·1 answer
  • Which type of chemical reaction does this equation exemplify?
    5·2 answers
  • Hello can you please help me to solve above questions. .​
    13·1 answer
  • What would happen if you didn't have chemical energy in your body
    7·2 answers
  • Methane<br><br> state at 25 degrees Celsius​
    9·1 answer
  • D
    8·1 answer
  • Some states authorize a to make healthcare decisions ------- for patients who can't make them because they're incapacitated. O a
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!