Answer:
I don't know sorry yyyyyyy6yyyyyyyyyyyyyyyyyyyyyyyyyyy
9 Select the correct answer. Which statement correctly describes a physical change? O A involves breaking and creating chemical bonds but not changing a phase OB. may involve a change in phase but does not involve a change in the molecular structure OC. may involve converting two or more substances into new substances OD. involves changes at the molecular level O E. involves energy transfer and change in color Reset Next
Answer: The statement that correctly describes a physical change is may involve a change in phase but does not involve a change in the molecular structure. The answer is letter B.
Explanation: trust me
Explanation:
OA- because there is breakdown of chemical bonds
If the adoms dont work are they dead
Answer: no
Explanation:
Atoms are not and have never been alive so they can't be considered dead. they simply do not meet any reasonable of life, primarily because they are not complex.
What kind of elements form covalent compounds?
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. In general, ionic bonds occur between elements that are far apart on the periodic table.
need help with this question, anybody ..
-20 points :)
please help me!! DUE TOMORROW :(
Answer:
It’s in the photo, sorry if it’s really messy!
Explanation:
Please ask if you have any questions!
Question 1
Of the following which displays a positive energetic process?
We can describe a positive energetic process as any process which increases the internal energy of the system.
A positive energetic reaction or process is often referred to as being Endothermic. This means that the system which is performing the process absorbs energy. Some examples include:
Boiling an EggRoasting food over a fire (the food is the reference system)etc
Therefore, we can confirm that a positive energetic process is one in which the system in question absorbs energy, thus increasing its internal energy.
Since I could not locate the options online, I have provided a general explanation of the concept coupled with a few examples.
To learn more visit:
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If 16800 J of energy are added to 4200g of water, what will the change in temperature (delta T) of the water be? Specific heat of water is 4.184 J/gºC *
Answer:
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what is the chemistry of super glue
cyanoacrylate
When cyanoacrylate polymerizes, the cyanoacrylate sticks together on an atomic level, and it becomes solid. Super Glue solidifies in all the microscopic crevices of an object that it moved into when it was a liquid, and it can form chemical bonds with any anions in the object.
how many molecules are in 2.50 moles of co2
Answer:
[tex]1.51 \times 1024 \: \: molecules[/tex]
Explanation:
There are 1.51 x 1024 molecules of carbon dioxide in 2.50 moles of carbon dioxide.
Which is better Epoxy or Super Glue?
Answer:
Personally, I use Superglue
Explanation:
What is the total pressure exerted by a mixture containing two gases if the partial pressure of one gas is 70 kPa and the partial pressure of the other gas is 30 kPa?
Answer:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Explanation:
hope this helps have a wonderfull day!
Which of the following is not a place where hydrogen can be found on Earth?
A) Natural gas well
B)
Water
Mine
Atmosphere
Answer:
Atmosphere
Explanation:
Natural gas is mainly hydrocarbons like C3H8 and that has hydrogens, water is H2O and had hydrogens, mines have it in the minerals.
What is the momentum of a car if its mass 200kg and moving with a speed of 3m/s?
600 kg·m/s
Given:Mass = 200 kg
Velocity = 3 m/s
Power = Mass * Velocity = 200 kg * 3 m/s = 600 kg·m/s
1. Before starting, make a prediction: If substances B and C are both in the gas phase and are at the same energy level, which of the two substances will need to have more energy transferred out in order to change to the liquid phase? Substance B or substance C? Explain your answer.
Answer:
Substance C
Explanation:
Substance C would be the answer because Substance C has a lower attraction level. Because of this, it takes more energy to take out of in order to become a liquid.
how many moles of carbonate are there in sodium carbonate
There are 0.566 moles of carbonate in sodium carbonate.
CALCULATE MOLES:The number of moles of carbonate (CO3) in sodium carbonate (Na2CO3) can be calculated by dividing the mass of carbonate in the compound by the molar mass of the compound. no. of moles of CO3 = mass of CO3 ÷ molar mass of Na2CO3Molar mass of Na2CO3 = 23(2) + 12 + 16(3)= 46 + 12 + 48 = 106g/molmass of CO3 = 12 + 48 = 60gno. of moles of CO3 = 60/106 no. of moles of CO3 = 0.566molTherefore, there are 0.566 moles of carbonate in sodium carbonate.Learn more about number of moles at: https://brainly.com/question/1542846
Describe the factors that can be used to predict whether or not a nuclide is stable.
Which branch of Earth science focuses more specifically on Earth's atmosphere?
Answer:
Meteorology
Explanation:
Meteorology focuses on Earth's atmosphere and, especially, how changes in the atmosphere affect weather and climate on Earth's surface.
identify a binary salt among the following a,KNO3 b,NACIO3 c,MGSO4 d,CaCL2
The binary salt among the given salts is CaCl₂. The correct option is d,CaCl₂
From the question,
We are to identify the binary salt among the given salts.
First, we will define the term binary salt
A binary salt is a chemical compound that is formed from the mixture of a metal and a non-metal.
Among the given options, CaCl₂ is the salt formed from the mixture of a metal and a non-metal.
The metal is Calcium (Ca)
and the non-metal is Chlorine (Cl)
Hence, the binary salt among the given salts is CaCl₂. The correct option is d,CaCl₂
Learn more here: https://brainly.com/question/3103303
How many moles of CH, are present in a 13982.87 gram sample of CHg?
Explain why the total mass of carbon must be decreasing in a different step of the slow carbon cycle based on the increase in atmospheric CO2.
Total mass of carbon must be decreasing in different step of carbon cycle because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.
Carbon cycle refers to processes where carbon move from the atmosphere to the biosphere and Earth and then back to the atmosphere.
It involves processes of using and reusing carbon again and again and it's conservation.
Carbon is an organic matter found in living organisms and total mass of carbon reduces because it is a matter that is conserved.
Carbon is released from that atmosphere, use for photosynthesis, plants and animals consume the plants. They defecate , respirate and carbondioxide is released during respiration.
Therefore,Total mass of carbon must be decreasing in different step of carbon cycle because because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.
Learn more about Carbon cycle from the link below.
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NO LINKS!!!! 50 PTS!!!
What is a title name for Aerobic cellular respiration?
Answer:
try this
Explanation:
I searched it but I don't know
Consider the reaction where barium sulfate can be prepared from 2.76 mol of sodium sulfate and excess barium acetate. Sodium acetate is the other product
1.write the balanced MOLECULAR reaction.
2.write the balanced total ionic equation.
3.write the balanced net ionic equation.
Answer:
1. Na2SO4(aq)+C4H6BaO4(aq) --> BaSO4(s) + 2C2H3NaO2(aq)
2. 2Na^+1(aq) + SO4^-2(aq) + 4C^+4(aq) + 6H^+1(aq) + Ba^-2(aq) + 4O^-2(aq) --> BaSO4(s) + 2C^-4(aq) + 2H^+1(aq) + 3Na^+1(aq) + 2O^-2(aq)
3. Ba^+2(aq) + SO4^-2(aq) --> BaSO4(s)
Explanation:
BRAINLIEST TO CORRECT what would the cook time for 2 half-lives of the popcorn?
Answer:
Pop your popcorn for 2 minutes in the microwave but if you like to pop your popcorn old fashion get popcorn seeds and put them in an pot and then put a lid over it then pop it.
Explanation:
Can someone label these PLEASE !!! HELPPPPPP! DUE TODAYY
Answer:
1. melting
2boiling
3. freezing
4. condesation
Explanation:
A chemist performs the following reaction:
PCl5 (aq) + 4H2O (l) ⟶ H3PO4 (aq) + 5HCl (aq)
If she has 26.4 g of PCl5, what mass of water should she react to use up all of the
PCl5?
Looking for an in-depth step by step, please
Answer:
9.17 g
Explanation:
1) Calculate mols of PCl5
PCl5 (aq) + 4H2O (l) ⟶ H3PO4 (aq) + 5HCl (aq)
Mass of PCl5: 26.5g
Molar Mass of PCl5 208.24g/mol
Mol of PCl5 = Mass PCl5 /Molar mass PCl5 = 26.5g / (208.24g/mol) = 0.127257011 mol
2) Calculate mols of water needed to react
Mols of H2O per 1 Mols of PCl5 = 4 (because 4 water is needed to Phosphorus pentachloride).
Mols of H2O = Mol of PCl5 * 4 = 0.127257011 * 4 = 0.509028044 mols
3) Calculate Grams of water needed to react
Mols of H2O = 0.509028044 mols
Molar Mass of H2O = 18.015 g/mol
Mass of H2O = Mols of H2O * Molar Mass of H2O
= 0.509028044 mols* 18.015 g/mol = 9.17014021 g
sf = 3
9.17 g
Which of the following statements about subatomic particles is BEST supported by information in the article?
A. The motion of large objects is just as unpredictable as that of subatomic particles.
B. Subatomic particles don’t follow the same laws of physics as large objects.
C. The force of gravity acts more strongly on subatomic particles than on large objects.
D. It is easier to measure the movement of subatomic particles than the movement of large objects.
The characteristics of the subatomic particles allow to find which is the correct answer:
B) Subatomic particles don’t follow the same laws of physics as large objects.
Subatomic particles are the contributors to atoms, the main three being electrons, protons, and neutrons. The movement of these particles is described by the Schrodinger equation, the result of which is wave function.
To obtain the physical function of the wave mergers, the probability function must be constructed.
P = Ф* Ф
therefore the movement of the subatomic particulars is probabilistic at all times, when a large number of them join the mean value of this probability closer to the macroscopic movement.
Let's examine the claims.
A) False. The macroscopic motion of objects is the mean value of the microscopic motion, which with increasing size is deterministic and predictable.
B) True. Subatomic particles follow the rules of the Schrodinger equation and macroscopically Newton's second law. Inconsequently they use different laws or to describe
C) False the most important force is electrostatic.
D) false. Large particles can be measured with a ruler, but sublimation that are orders of magnitude smaller require instruments of great pressure and complexity.
In conclusion using the characteristics of the subatomic particle we can find what the correct answer is;
B) Subatomic particles don’t follow the same laws of physics as large objects.
Learn more about subatomic particles here: brainly.com/question/3176193
After you have analyzed the data from an experiment, what do you do? O A. Draw a conclusion a O B. Control the variables C. Make a hypothesis D. Identify the variables
Answer:
A. Draw a conclusion
Explanation:
correct me if I'm wrong :>
Answer all questions please and be quick, it’s very URGENT
hi uhm
Explanation:
it's dark and lighting
10 ml of solution of acetic acid is added to 250 ml volumetric flask , the concentration of diluted vinegar is 0.01 M. What is the % by mass of acetic acid in vinegar if the density of vinegar is 1.05 g/ml. ( C: 12 O:16 H: 1 )
The percentage by mass of the acetic acid is 0.057%.
The given parameters:
Volume of the acetic acid = 10 mlVolume of the flask, = 250 mlConcentration of the diluted vinegar = 0.01 MDensity of the vinegar, ρ = 1.05 g/mlThe concentration of the acetic acid is calculated as follows;
[tex]C_1V_1 = C_2 V_2\\\\C_1 = \frac{ C_2 V_2}{V_1} \\\\C_1 = \frac{0.01 \times 250}{10} \\\\C_1 = 0.25 \ M[/tex]
The number of moles of acetic acid in the given concentration;
[tex]C = \frac{mol}{L} \\\\mole = CL\\\\mole = 0.25 \times 10 \times 10^{-3} \\\\mole = 0.0025[/tex]
The molar mass of acetic acid = 60 g/mol
The mass of acetic acid in the given number of moles is calculated as follows;
m = conc. x molar mass
m = 0.0025 x 60
m = 0.15 g
The mass of vinegar in the volume and density;
m = density x volume
m = 1.05 x 250
m = 262.5 g
The percentage by mass of the acetic acid is calculated as follows;
[tex]= \frac{0.15}{262.5} \times 100\%\\\\= 0.057 \%[/tex]
Thus, the percentage by mass of the acetic acid is 0.057%.
Learn more about percentage by mass here: https://brainly.com/question/22060503
activation energy in reaction is used to:
A- Overcome repulsion force between colliding molecules
B- Breaking bonds
C- Merge Valence electrons
D- All of them
Answer:
D — All of them
Explanation:
The activation energy in a reaction is the minimum amount of energy required for a chemical reaction to take place. Since all the options are processes in a chemical reaction, D should be the answer.
