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
irina1246 [14]
3 years ago
11

Which of the following chemical formulas represents a molecule? H2 CO2 SiO2 NH3

Chemistry
2 answers:
astraxan [27]3 years ago
5 0

Answer:

H2

Explanation:

H (or hydrogen), being a halogen, as an atom, has 7 valence electrons. This means that it naturally bonds with another atom of the same isotope in order to reach the desired total of valence electrons: 8.

So... H+H = H2. EZ

love history [14]3 years ago
5 0

Answer:

its all of them

Explanation:

i just did it lol but just incase, "Molecules are made of two or more atoms that are chemically bonded together. The atoms can be of the same element or of different elements. Therefore, H2, CO2, SiO2, and NH3 are all molecules."

You might be interested in
Magnesium reacts with a certain element to form a compound with the general formula MgX. What would the most likely formula be f
ziro4ka [17]

Answer:K2X

Explanation: Valency can be defined as the combining power of an element. It is the valency that dictates the value an element will have when writing a chemical formula for its compound.

MgX is a compound of magnesium and an element X. The valency of magnesium in most of its compound is +2. Now for the 2 to have been absent in the chemical formula, this shows that the element X itself have a valency if -2 for the valencies of both to have canceled out.

Now considering the element potassium, it is an alkaline metal belonging to group 1 of the periodic table. Hence, it is expected that it has a valency of +1

Forming a compound with element X means there would be an exchange of valencies between the two. We have established that x has a valency of -2. The formula of the compound thus formed by exchanging the valencies of both element would be K2X

7 0
2 years ago
Read 2 more answers
The Doppler effect changes the
dem82 [27]
<span>A) Frequency due to motion

As you are moving toward the object that is making the sound the frequency is higher.  When you begin to move away the frequency lowers.
</span>
3 0
3 years ago
Read 2 more answers
Which statement about enzymes is true
artcher [175]
The lower the activation energy required for a chemical reaction
3 0
3 years ago
Which two equations represent double-replacement reactions?
enyata [817]

Answer: A and D, I believe

Explanation:

8 0
2 years ago
Read 2 more answers
The decomposition of acetaldehyde is a second order reaction with a rate constant of 4.71 10−8 L/mol/s. What is the instantaneou
pochemuha

Answer: Rate of decomposition of acetaldehyde in a solution is 1.45\times 10^{-14}mol/Ls

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

For a reaction : A\rightarrow products

Rate=k[A]^x

k= rate constant

x = order of the reaction = 2

Rate=4.71\times 10^{-8}L/mol/s\times {5.55\times 10^{-4}M}^2

Rate=1.45\times 10^{-14}

Thus rate of decomposition of acetaldehyde in a solution is 1.45\times 10^{-14}mol/Ls

6 0
3 years ago
Other questions:
  • Silver is a precious metal. The price of silver fluctuates daily as it is traded on the open market. Look up the current market
    15·1 answer
  • Calculate the number of moles in 456 g of lead, Pb
    10·1 answer
  • If r⃗ =bt2i^+ct3j^, where b and c are positive constants, when does the velocity vector make an angle of 45.0∘ with the x- and y
    14·1 answer
  • Phthalates, BPA, PFOA, and Atrazine are chemicals that don't degrade rapidly, and they are readily taken up by cells in the body
    6·1 answer
  • A 2-kg block rests on a wall that is 3 m tall. What is the gravitational potential energy of the block? The force of gravity on
    8·1 answer
  • Sulfur dioxide has a vapor pressure of 462.7 mm Hg at –21.0 °C and a vapor pressure of 140.5 mm Hg at –44.0 °C. What is the enth
    8·1 answer
  • Which factor(s) will most likely lower the activation energy of a reaction?
    13·2 answers
  • PLS HELP ASAP NO LINKS WILL MARK BRAINLIEST IF CORRECT
    13·2 answers
  • How many moles of HCL are needed to react with 0.300 mol of na2 CO3​
    9·1 answer
  • Why is it impossible to have an undiscovered element that would fit between sodium and magnesuim
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!