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
weqwewe [10]
2 years ago
7

The element carbon is also called the "element of live". Declare.

Chemistry
1 answer:
wel2 years ago
7 0

Answer:

The molecules of all living things contain backbones that consist of carbon atoms.

Explanation:

Millions of carbon-based compounds make up the cells and other structures of living organisms.  

Organisms need these compounds to live, grow, and reproduce. Without them, life could not exist,

You might be interested in
Which of the following represents a phase change? A. Melting B. Crushing C. Expanding D. Burning
Fantom [35]
Melting is an example of phase change
6 0
3 years ago
Who else had to do a final model for the rust unit ​
ArbitrLikvidat [17]
Which one? Are u saying.
4 0
2 years ago
Use Lewis theory to determine the chemical formula for the compound formed between Sr and N.
mariarad [96]

Answer:

Sr_3N_2

Explanation:

Hello,

In this case, since the Lewis theory is based on the bonds formation between atoms via the valence electrons, we can verify the chemical formula of the compound formed by strontium and nitrogen by noticing that strontium has two valence electrons as it is in group IIA, for that reason, two nitrogens should be available for bonding. Therefore, since nitrogen is in group VA, it is said that three electrons are required to attain the octet (maximum amount bonded electrons), for that reason, three strontiums are should be available for bonding. In such a way, the formula should be:

Sr_3N_2

Regards.

8 0
3 years ago
How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?
Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

pH= -log[H]\\pH= -log (\frac{kw}{[OH]})

8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}

[OH]=1.69E-6

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

Cu(OH)_2 -> Cu^{2+} + 2OH^-

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

Kps= [Cu^{2+}] [OH]^2

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

Kps= s*(2s+1.69E-6)^2

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is s=4.96E-8 mol/L

Now, let us calculate the moles in 1 L:

moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles

7 0
3 years ago
How far will you run in 3 minutes if you run at a pace of 4 meters per second?
atroni [7]

Answer:

you will run 720 meters

Explanation:

because 4 times 60 is 240 and 240 times 3 is 720

7 0
2 years ago
Other questions:
  • What is the formula for trinitrogen nonaoxide
    8·2 answers
  • What is the lewis dot structure of phosphorus decasulfide
    6·1 answer
  • How many atoms of oxygen are in 0.100 miles of silicon dioxide, SiO^2
    10·1 answer
  • The table shows the students data from an investigation about a plant growth and five plants of the same type what is the best w
    10·1 answer
  • How do you balance H2+O2 and H2O
    10·1 answer
  • Any moving object has _______________ energy A.kinetic B.potential C.gravitational potential
    13·2 answers
  • What type of energy uses turbines
    7·1 answer
  • Match the intermolecular force with the physical property that will result
    14·1 answer
  • 2. What is the smallest unit of an organism that is classified as living? *
    10·2 answers
  • Look at the table. Which of these three substances is not an alloy?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!