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
natima [27]
2 years ago
11

What is the best definition of the enthalpy change Hr

Chemistry
1 answer:
Gre4nikov [31]2 years ago
5 0

Answer:

<em>The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.</em>

You might be interested in
The density of an alcohol is 0.788 g/mL. What volume in microliters, μL, will correspond to a mass of 20.500 mg?
PIT_PIT [208]

Answer:10.500

Explanation:

Because u subtract

7 0
4 years ago
The exhaust gas from an automobile contains 3% by volume of carbon monoxide (CO). Express this concentration in mg/m3 at 25oC an
ser-zykov [4K]

Answer:

24540\frac{mg}{m^3}

Explanation:

Hello,

In this case, since the 3% by volume is represented as:

\frac{3L\ CO}{L\ gas}

By using the ideal gas equation we compute the density of CO:

\rho =\frac{MP}{RT} =\frac{28g/mol*1atm}{0.082\frac{atm*L}{mol*K}*298K}= 0.818g/L

Then we apply the conversion factors as follows:

=\frac{3L\ CO}{100L\ gas}*\frac{0.818g\ CO}{1L\ CO} *\frac{1000mg\ CO}{1g\ CO} *\frac{1000L\ gas}{1m^3\ gas} \\\\=24540\frac{mg}{m^3}

Regards.

4 0
3 years ago
The ability of an atom to attract the shared electrons in a covalent bond is its
DochEvi [55]
<span>The ability of an atom to attract the shared electrons in a covalent bond is its:</span>electronegativity.
8 0
3 years ago
Which statement(s) correctly compare the masses of protons, neutrons, and electrons? Select two options.
Ludmilka [50]

Answer:

6 Electrons r smaller than a proton or a neutron

5 0
3 years ago
A metal atom loses electrons from its outermost energy level and acquires a...... Charge. These electrons join a nonmetal atom.
sp2606 [1]

Answer : A metal atom loses electrons from its outermost energy level and acquires a Positive Charge. These electrons join a nonmetal atom. The ionic compound formed because of this transfer of electrons is electrically Neutral.

Explanation :

All the elements try to acquire octet state by gaining or losing electrons. For metals, the number of valence electrons are less and it is easier to lose these electrons.

When electrons are lost, the number of protons become more than the electrons. This creates an excess of positive charge. As a result the species becomes positively charged and is known as cation.

During formation of ionic bond, metals always form a positive ion (cation) by losing electrons. These electrons are accepted by the nonmetals and they become negatively charged. A negatively charged ion is known as anion and nonmetals always form an anion.

These are attracted to each other due to the opposite charges present on them. In an ionic compound they balance the charges on each other making the compound neutral.

From the above discussion, we can fill in the blanks as follows.

A metal atom loses electrons from its outermost energy level and acquires a Positive Charge. These electrons join a nonmetal atom. The ionic compound formed because of this transfer of electrons is electrically Neutral.



7 0
3 years ago
Other questions:
  • What is the mass of a bacterial cell?
    12·2 answers
  • How do the interactions that are broken in water when it is boiled compare with those broken when water is electrolyzed? Boiling
    5·1 answer
  • Which statement about climate is true?
    11·1 answer
  • 3. How did organizing the periodic table by atomic number help scientists?
    7·1 answer
  • Помогите пожалуйста или с первым вопросом или со вторым. Буду очень благодарна, т.к. это мой зачет... :С
    5·1 answer
  • How does the tilt of earth <br>affect the climate?
    15·1 answer
  • The mass of a salt in grams that will dissolve in 100 mL of water.
    13·1 answer
  • (Please help ASAP I will mark brainliest!! (: )Which of the following describes what happens when a cell uses energy to transpor
    15·2 answers
  • What is Chemistry? What topics are covered in chemistry?
    6·2 answers
  • 20 PIONTS PLZ HELP
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!