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
dimaraw [331]
3 years ago
9

An atom of lithium 7 has an equal number of

Chemistry
2 answers:
Andreas93 [3]3 years ago
8 0
Electrons and protons
yw
lukranit [14]3 years ago
5 0
Electrons and protons because they are essentially always the same
You might be interested in
What is the electron configuration for helium (He)?
givi [52]
Hello!

The electron configuration for helium is 1s2
3 0
3 years ago
Read 2 more answers
How many atoms of Sn are in 0.796 moles of this element?
garik1379 [7]

Answer:

savsdfasfsewce

Explanation:

afsfsfdsfesdfsdgsdgdg

3 0
3 years ago
explain why it is a common laboratory procedure to heat analytical reagents and store them in a dessicated atmosphere (a sealed
Readme [11.4K]

Explanation:

Most reagent forms are going to absorb water from the air; they're called "hygroscopic".  Water presence can have a drastic impact on the experiment being performed  For fact, it increases the reagent's molecular weight, meaning that anything involving a very specific molarity (the amount of molecules in the final solution) will not function properly.

Heating will help to eliminate water, although some chemicals don't react well to heat, so it shouldn't be used for all.  A dessicated environment is simply a means to  "dry."  That allows the reagent with little water in the air to attach with.

6 0
3 years ago
When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C
natka813 [3]

Answer:

\Delta_{r}U of the reaction is -6313 kJ/mol

\Delta_{r}H of the reaction is -6312 kJ/mol

Explanation:

Temperature\,\,change= \Delta U = 29.419-25.823 =3.506^{o}C

q_{cal}= C \times \Delta T

=5.861 \times 3.596 = 21.076\,kJ

q_{rxn}= -q_{cal}= -21.076\,kJ

\Delta_{r}U= -21.076 \times \frac{154}{0.5141}= -6313\, kJ/mol

Therefore, \Delta_{r}U of the reaction is -6313 kJ/mol.

The chemical reaction in bomb calorimeter  is as follows.

C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)

Number\,of\,moles\Delta n=(12+5)-\frac{27}{2}=3.5

\Delta_{r}H=\Delta E+ \Delta n. RT

=-6313+3.5\times 8.314\times 10^{-3} \times 3.596=-6312\,kJ/mol

Therefore, \Delta_{r}H of the reaction is -6312 kJ/mol.

3 0
3 years ago
True or false? Covalent molecules are formed when non-metal atoms share electrons with other non-metal atoms.
Tomtit [17]

Answer:

true

covalent bonds are between non metals and nonmetals. and they are sharing electrons.

7 0
3 years ago
Other questions:
  • Explain how you determine the number of valence electrons that should be used in the dot structure for silicon dioxide and state
    14·1 answer
  • I make my cup of coffee in the morning by pouring boiling water over ground-up coffee beans held in a special piece of paper and
    6·1 answer
  • Identify a false statement about how to protect iron from corrosion.
    15·1 answer
  • Which intermolecular force is characteristic of compounds with low molar mass, which are liquids at room temperature and have re
    7·1 answer
  • How is human activity affected by sinkholes
    13·1 answer
  • An example of a substance that is acidic is __________
    5·1 answer
  • BRAINLIEST ASAP! PLEASE HELP ME :)<br><br> What ancient Greek theory did Robert Boyle help dispel?
    15·1 answer
  • A student was assigned to take water samples from a lake his home . He measured the pH of one of the water samples to be 6.0 . W
    11·1 answer
  • Which is not a form of potential energy?<br><br> gravitational<br> chemical<br> elastic<br> thermal
    11·1 answer
  • How many electrons are in a ion that has 16 protons and 59 neutrons if it has negative 2 charge? ​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!