1 mole of water is contained in a sample of water that has a mass of 18.0 g.
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles of a substance can be calculated by dividing the mass of that substance by its molar mass.
no. of moles = mass ÷ molar mass
According to this question, a sample of water has a mass of 18.0g. The number of moles is calculated as follows:
no. of moles of H2O = 18.0g ÷ 18g/mol
no. of moles of H2O = 1mol
Therefore, 1 mole of water is contained in a sample of water that has a mass of 18.0 g.
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Choose all of the examples that show a chemical change.
A) A woodpecker digs in the bark.
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
D) A farmer is cutting logs with an axe.
E) A tree drops rainwater from its leaves.
Answer:
B and C
Explanation:
Answer:
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
Explanation:
It cannot return the the state it was in before or have the same composition it had before.
how many grams of baf2 are dissolved in 75.0 ml of a saturated solution of baf2? ksp = 1.00 x 10-6
Using the solubility product of the saturated solution, the mass of BaF2 dissolved is 0.083 g.
The equation of the reaction is obtained from;
BaF2(s) ⇄ Ba^+(aq) + F^-(aq)
The concentration of the substance can be obtained from the Ksp as follows;
Ksp = [Ba^2+] [2F^-]^2
Ksp = 4x^3
x = ∛Ksp/4
x = ∛ 1.00 x 10-6/4
x = 6.3 x 10^-3 M
Given that;
mass/molar mass = concentration x volume
molar mass = 175 g/mol
concentration = 6.3 x 10^-3 M
volume = 75.0 ml or 0.075 L
Mass = ?
Mass = concentration x volume x molar mass
Mass = 6.3 x 10^-3 M x 0.075 L x 175 g/mol
Mass = 0.083 g
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Which of the following liquids has the highest viscosity
A water
B oil
C milk
D honey
Answer:
honey has the highest viscosity
According to the given option, honey is the liquid that has the highest viscosity. So, the correct option is D.
What do you mean by Viscosity?Viscosity may be defined as the effects of a liquid by probity of which an internal resistance comes into play when the liquid is in movement and resists the comparable motion between its distinct layers.
Among all the given options, honey possesses more strong intermolecular attractive forces that result in the high compaction of particles in the honey.
After honey, Oil is more viscous followed by milk, and then water.
Therefore, the correct option for this question is D.
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How does an introduced species affect an ecosystem? Give 2 examples of positive ways
and 2 examples of negative ways.
Answer:
1+ it can help create balance among the ecosystem, particularly by controlling invasive species
2+ can help restore native ecosystems on degraded land
1- can become an invasive species
2- can cause an imbalance among native species
Explanation:
any process that results in the formation of an ion
The energy required to cause a gaseous atom or ion to release a electron is what?
Answer:
Ionization is the process by which ions are formed by gain or loss of an electron from an atom or molecule.
a. Write thepossible isomers of C4 HgBr4
The four isomers of C4H9OH are
As refer to IMAGE 01- Butan−1−ol
As refer to IMAGE 02- Butan−2−ol
As refer to IMAGE 03- 2−methylpropan−2−ol
As refer to IMAGE 04- 2−methylpropan−1−ol
solution
https://www.toppr.com/ask/en-gb/question/write-down-all-isomers-of-c4-h9oh/
Fill in the blank:
A correctly written hypothesis uses an ____ ______ statement
Answer:
a theory of a experiment and the experiment acts like a judge determining if the hypothesis is right or wrong from the final test result
Explanation:
(1) What is the history of renewable energy in the United States?
(2)What are the advantages and
disadvantages of renewable energy?
(3)What can you do to help forsee a sustainable energy future
in the United States?
You must address all of these
questions in a minimum 2 paragraphs.
Answer:
Historically, wood was the main source of U.S. energy until the mid-1800s and was the only commercial-scale renewable source of energy in the United States until the first hydropower plants began producing electricity in the 1880s.
The Advantages of Renewable Energy Resources-A Fuel Supply That Never Runs Out.Zero Carbon Emissions.Cleaner Air and Water.Disadvantages of Renewable Energy-he Electricity Generation Capacity is Still Not Large Enough.Renewable Energy Can be Unreliable.
First, we need to take advantage of the world's abundant natural gas resources and reduce coal consumption;
Second, governments must support development of carbon capture and storage technology to make fossil fuel use cleaner;
Explanation:
The reactant side of a balanced chemical equation is shown below,
PC15 + 4H20 →
How many hydrogen atoms should there be on the product side in the equation? (5 points)
8
6
4
2
Answer:
do u still need the answer..
Explanation:
Which subatomic particles have a positive charge and are located in the nucleus?
a. neutrons
b. atoms
c. electrons
d. protons
Answer: protons
Explanation:
a) Neutrons are located in the nucleus but have a negative charge.
b) Atoms are not subatomic particles but are rather made of subatomic particles.
c) Electrons are subatomic particles with a negative charge that are located outside of the nucleus.
d) Protons are subatomic particles that are located in the nucleus and have a positive charge.
why do the noble gases have relatively low electron affinities?
Answer:
Because noble gases have a full octet, their ionization energies are actually quite high. Electron affinity is the amount of energy released when an electron is added to a neutral atom. Because noble gases have stable electron configurations, they have very low electron affinities.
Explanation:
Answer:
Noble gases have a stable outer shell
Explanation:
What is the relationship between layering of fluids and density?
Density of a liquid determines how it will layer (heaviest to lightest). If the liquid is least dense it will float to the bottom. Layers will remain separated because each liquid is actually floating on top of the more dense liquid beneath it.
the method of mass production that developed during the nineteenth century was a process that
Answer:
Relied on the use of power driven machinery
Explanation:
Its because the machines would increase the mass productivity of goods
What is the purpose of an indicator in a titration.
Answer:
The role of indicator in titration is to detect the endpoint of the titration. When the colour of the solution changes, it indicates that the concentration of the chemical specie has reached a critical range. This change in colour is possible with the help of indicators.
Explanation:
hope it helps
#carry on learning and keep safe
correct me if I'm wrong and if correct brainliest me please
Which of the following is not a use of radioactive isotopes?
a) Energy generation
b) Carbon dating
c) Chemotherapy
d) Radiotherapy
Answer:
i belive the answer you are looking for is A.. hope this helps!
Explanation:
im not really 100% certain of this answer due to the fact i am a little rusty.
Which atom has the largest atomic radius? *
1.Cl
2.F
3.I
Answer: 2
Explanation:I think
Identify the subatomic particles in strontium-82 and rubidium-82. Then, explain what type of nuclear decay is most likely to convert strontium-82 to rubidium-82.
We can convert strontium-82 to rubidium-82 by positron emission.
The three main fundamental subatomic particles in an atom are;
ProtonsNeutronsElectronsIn a neutral atom, the number of protons is always equal to the number of electrons.
In strontium-82, there are 44 neutrons, 38 electrons and 38 protons. In rubidium-82, there are 45 neutrons, 37 electrons and 37 protons. We can convert strontium-82 to rubidium-82 by positron emission.
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The barometric pressure in Breckenridge, Colorado (elevation 9600 ft) is 580 mmHg. How many kPa is this?
Answer:
1 atmospheric pressure = 760.0 mm Hg
Thus 580 mm Hg = (580 mm Hg/(760 mm Hg/atm))
= 0.763 atm
what happens to glucose in the body?
After your body has used all the energy it needs, leftover glucose is stored in the liver and muscles. We can store enough fuel for about a day, if you haven't eaten in a while, your blood glucose level drops. :)
Hope this helps!
Which substances will make a salt when combined?
Vinegar and tea
Soda and wine
Soda and ammonia
Fertilizer and detergent
Answer:
Soda and wine is the answer to your question.
Explanation:
yo make salt you need a base and an acid. in this case the base is soda and the wine is acid. hope that helps :)
Part A
What question is being asked through this scientific investigation?
(I didn’t know what subject so sorry, also only answer if u have an answer.)
Answer:
How will the ingredients effect the fermentation of each bottle? What will happen to the bottles and balloons when fermentation occurs?
Explanation:
Jane made this picture to represent a chemical reaction:
Two circles, one white and the other gray are shown on the left. A small portion of the two circles overlap and the label below the circles is XY. An arrow pointing right is shown on the right of the overlapping circles. There are two circles on the right of the arrow, one white and the other gray, and there is a plus sign between them. The white circle is labeled X and the gray circle is labeled Y.
Which of the following statements best explains the type of chemical reaction represented by Jane's picture? (5 points)
It represents a synthesis reaction because one combined reactant forms multiple products.
It represents a synthesis reaction because the same atoms are present in the reactants and products.
It represents a decomposition reaction because one reactant breaks apart and forms two products.
It represents a decomposition reaction because the total mass of the products is less than the mass of the reactant.
The reaction represents a decomposition reaction because XY is broken into its constituents.
A decomposition reaction is one in which the reactant is broken up into its constituents. In this case, the reactant is XY. The reactant is shown in the left hand side. The reactant is broken up to yield the products. X and Y.
Since the reactant was broken up into the one white and one gray circles labelled X and Y, then the reaction is a decomposition reaction.
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Answer:
C if your answers are different!
Explanation:
Why do some atoms form chemical bonds while others do not?
Answer:
Atoms of these elements have full outer electron shells. These atoms are stable and very rarely form bonds with other atoms. If the electronegativity values between two atoms are comparable, they may still form chemical bonds to increase the stability of their valence electron shell
Explanation:
What are the most of the elements in the periodic table
Answer:
Most of the elements in the periodic table are metals.
Hope that helps. x
Answer:
Here is your answer,mate!
Explanation:
Metals are the most of the elements in the periodic table.
An ion is:
Select one:
a.
An atom with an extra neutron.
b.
An atom or molecule with an electrical charge.
c.
The outermost shell of an atom.
Why do trees not yet colonize the island?
Question 13 (2 points)
Given the following images, choose the one that most likely represents an M-class star. (2 points)
A
B
с
D
Оа
A
Oь в
Ос
О с с
Od D
Answer:
b. because its Rigel star
Explanation:
hope itsattachments
what is the formula of trinitrogen tetrabromide
The formula of trinitrogen tetrabromide is N3Br4
How to determine the molecular formulaTrinitrogen features three molecules of nitrogen, N3
Tetrabromide features four molecules of bromide = Br4
Thus, the formula of trinitrogen tetrabromide is N3Br4
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What is the chemical reaction by which organisms break down food
molecules for energy?
Answer:
cellular respiration
Explanation:
hope this helps :)
brainliest plzzzzzzz
PLEASE HELP
When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?
Answer:
e=hf conversion
hope it helps! stay safe as always!