Answers
Answer:
A
Explanation:
Carbon dioxide in the air
Answer:
c
Explanation:
it is acidic due to carbon dioxide dissolving into it and forming a weak carbonic acid.
Related Questions
A hydrogel is composed of crosslinked polymer chains, which are highly water absorbent. The gels are mostly (mostly>90%) water. Liesegang line patterns are precipitation patterns that appear in a gel when a chemical reaction takes place when a diffusing chemical (reactant A) in a gel reaches a concentration that is just enough to react with the reactant B (already present and homogeneously distributed in the gel) to form a precipitate. This precipitate appears as a colored line in the gel. Once the precipitate forms, reactant A is consumed all – however, diffusion of A does not stop. A ions propagate deeper into the gel and form another line of the precipitate when the A concentration again reaches the threshold concentration, just enough to react with the reactant B.
In the system shown on the right, A=Cu2+ ions, B is CrO42-. Cu2+
ions diffuse from the solution at the top into the yellow-colored
gel, which has CrO42- solution. The Cu2+ ions react with CrO42-
ions to form the CuCrO4 precipitate. There are no Cu2+ ions
present in the gel before the diffusion. Assuming that the
concentration of Cu2+ does not change at the solution/gel interface
and is 4.0 mol/L, and it is 0 mol/L at the bottom of the gel for the
duration of the precipitate formation,
1) find the depth of the first precipitate line that would appear in
the gel if the threshold concentration for the line formation is 0.05
mol/L and the time for the line to appear is 5 hrs. The temperature
is 25oC. D25= 1.2x10-8 m2/s.
2) at which temperature the line would appear at the same distance from the start, but in 75 min? Qd= 40 kJ/mol
Answers
Fill in all the grey boxes including the green box. PLEASE HELP
Answers
Answer:
2Na + 2H2O ----> 2NaOH + H2
Explanation:
How many molecules are found in 3.18 x 10^24 molecules of O2
Answers
Answer:
5.28 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.18 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 5.282392...[/tex]
We have the final answer as
5.28 molesHope this helps you
5.69 x 10
5.27 x 1014
Answers
5.27 x 1014 = 5,343.78
If the value of mass doubles but the volume stays the same, the value for density will be
Answers
Answer:
if the value of volume doubles but the mass stays the same, the value for density will be 1
Acetylene torches are used for welding, but the thermite reaction can be useful in situations in which acetylene torches are inappropriate, such as welding underwater. The thermite reaction is described by the equation below:
Upper F e subscript 2 upper O subscript 3 plus 2 upper A l right arrow upper A L subscript 2 upper O subscript 3 plus 2 upper F e. (see image)
A welder has 1.873 × 102 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first?
How many grams of aluminum oxide are produced in the reaction?
Answers
Al is the limiting reactant and would run out quickly and 357 g of aluminum oxide is produced.
What is the limiting reactant?The limiting reactant is the reactant is the reactant that is present in the least amount in the system. This is the reactant that is going to run out most quickly. The limiting reactant would be the one that would determine the amount of product that is formed.
Now the reaction equation is shown in the image attached to the question above.
Number of moles of Fe2O3 = 1.873 × 10^2 g /160 g/mol = 1.17 moles
Number of Al = 94.51 g Al/27 g/mol = 3.5 moles
If 1 mole of Fe2O3 reacts with 2 moles of Al
1.17 moles of Fe2O3 reacts with 1.17 moles * 2 moles/ 1 mole
= 2.34 moles
Hence Al is the limiting reactant and would run out quickly.
Mass of aluminum oxide produced = 3.5 moles * 102 g/mol = 357 g
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a certain element xx has four isotopes. 51.45% of xx has a mass of 89.90470 amuamu . 11.22% of xx has a mass of 90.90565 amuamu . 17.15% of xx has a mass of 91.90504 amuamu . 20.18% of xx has a mass of 93.90632 amuamu . what is the average atomic mass of element xx ?
Answers
Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of element x is 91.16759 amu.
Definition of atomic massThe atomic mass is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeIsotopes of the same element are those atoms where the atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
51.45% (0.5145) of x has a mass of 89.90470 amu. 11.22% (0.1122) of x has a mass of 90.90565 amu. 17.15% (0.1715) of x has a mass of 91.90504 amu. 20.18% (0.2018) of x has a mass of 93.90632 amu.Then, the average mass of the element x can be calculated as:
average mass= 89.90470 amu×0.5145 + 90.90565 amu×0.1122 + 91.90504 amu×0.1715 + 93.90632 amu×0.2018
Solving:
average mass= 91.16759 amu
Finally, the average atomic mass of element x is 91.16759 amu.
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3Fe + 4H2O ‐----> Fe3O4 + 4H2
10 g of water vapour are passed on 16.8 g of iron which is heated till redness find the limiting reactant
Answers
The limiting reactant : Fe
Further explanationReaction
3Fe + 4H₂O ⇒ Fe₃O₄ + 4H₂
mass of H₂O = 10 g
mol H₂O (MW=18 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{10}{18}=0.56[/tex]
mass of Fe = 16.8 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{16.8}{56}=0.3[/tex]
Limiting reactant : the smallest ratio between mol : reaction coefficient
Fe :
[tex]\tt \dfrac{0.3}{3}=0.1[/tex]
H₂O :
[tex]\tt \dfrac{0.56}{4}=0.14[/tex]
Fe as limiting reactant
The third test you read about uses the apparatus shown above to test for conductivity of electricity. If the bulb lights up, then the substance dissolved in the water is likely
Answers
Answer: A.ionic
Explanation:
Got it right
Answer:
Ionic
Explanation:
3. A compound formed of CO2 and water is sour? Why?
Answers
Explanation:
it's because when CO₂ reacts with H₂O then it forms H₂CO₃ (carbonic acid), which is a acid that's why a compound formed by CO₂ and H₂O is sour.
Reaction:
CO₂ + H₂O → H₂CO₃
Need answers to all these questions asap
Answers
Answer:
Li3PO4 + Sn(CH3COO)2 ------> LiSnPo4 + Li2(CH3COO)2
Explanation:
At 35°C and 2 atm of pressure, the volume of gas is 200 ml. If the temperature changes to
55°C and the pressure changes to 4 atm, what is the new volume of gas?
Answers
Answer:
V₂ = 106.5 mL
Explanation:
Given data:
Initial volume =200 mL
Initial pressure = 2 atm
Initial temperature = 35 °C (35 +273 = 308 K)
Final temperature = 55°C (55+273 = 328 K)
Final volume = ?
Final pressure = 4 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 2 atm ×200 mL × 328 K / 308 K ×4 atm
V₂ = 131200 atm .mL. K / 1232 K.atm
V₂ = 106.5 mL
When more than one variable is an experiment is changed at a time, the scientist
Answers
Answer:
Nepal is rich in biodiversity
Compression will lead to a reverse fault
A.True
B.False
Answers
Answer:
If the fault develops in a situation of compression, then will be a first fault due to the fact that compression causes the hanging wall to be pushed up relative to the footwall.
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed. Which word from the selection helps you understand that physical changes can be undone? a added b dissociate c recombine. d removed
Answers
Answer:
b dissociate
Explanation:
What is the Mass percent of carbon in glucose, C6H12O6?
Answers
Answer:
the answer is 40% but, correct me if I'm wrong
Explanation:
Answer:
40%
Explanation:
Mass of carbon / total mass × 100
72/180× 100 = 40%
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed.
Which word from the selection helps you understand that physical changes can be undone?
a added
b dissociate
c recombine.
d removed
Answers
Young trees growing under another tree would cause?
Answers
Answer:
competition
Explanation:
it would cause competition. both would fight for water and other stuff to grow and live
When is chemical energy released
Answers
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.
Answer:
Breaking or making of chemical bonds involves energy, which may be either absorbed or evolved from a chemical system. Energy that can be released or absorbed because of a reaction between a set of chemical substances is equal to the difference between the energy content of the products and the reactants, if the initial and final temperatures are the same.
Explanation:
How does heat differ from temperature? (Heat vs Temperature) Temperature is the measure of heat. Temperature is the measure of heat. Temperature and heat are the same thing. Temperature and heat are the same thing. Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy. Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy. Temperature measures the loss of energy, and heat measures the gain of energy.
Answers
Answer:
Temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
Explanation:
The difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
How does heat differ from temperature?Temperature is the measure of cold or heat, often measurable with a thermometer while heat is the flow of thermal energy from a substance with higher temperature to that with a lower temperature.
Temperature is a scalar quantity while heat is a vector quantity. This suggests that temperature has no direction while heat posseses direction.
Therefore, the difference between heat and temperature is that temperature measures thermal energy (kinetic energy), and heat is the flow of thermal energy.
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Explain the role of photosynthesis in the cycling of matter between the plant and the person?
Answers
The process of photosynthesis converts light energy into stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen.
What is photosynthesis ?Utilizing a process called photosynthesis, plants and other living things may transform light energy into chemical energy that can then be released through cellular respiration to power their activities. Photosynthesis, from the Greek phs (light) and synthesis (putting together), derives from the fact that some of this chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are created from carbon dioxide and water.
Photoautotrophic organisms, such as the majority of plants, algae, and cyanobacteria, carry out photosynthesis. The majority of the energy required for life on Earth is produced and maintained through photosynthesis, which is also primarily responsible for producing and maintaining the oxygen concentration of the Earth's atmosphere.
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When an atom becomes a positive
ion, the radius of the atom
(1) decreases
(2) increases
(3) remains the same
Answers
Answer: When an atom becomes a positive ion it pulls it's electrons closer, decreasing it's radius moreover, when it becomes a negative ion, it pulls it's electrons closer and decreases the radius
I hope this helps :)
Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? TA B Block A has a higher temperature than block B heat flow The two blocks are the same temperature and heat flow stops Heatis transferred from the wamer block to the cooler block 2012 Encyclopædia Batannlea, Inc. B B heat flow
Answers
Answer:
Heat is transferred from the warmer block to the cooler block
Explanation:
Heat transfer by conduction involves two or more solids. The heat generally moves from a part at higher temperature to one with a lower temperature.
Heat transfer is based on the differences in temperature profile on a body. When the temperature of the body is the same, heat is not transferred. The molecules that makes up the hotter body collides with static molecules of the cold one. Through this, heat is transferred.What is the main product of cellular
respiration?
Answers
Answer:
The main products are ATP, carbon dioxide, and water.
Most of the steps of cellular respiration take place in the mitochondria. Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.
the structure that serves as the outer boundary of the eukaryotic cell is the cell membrane
Answers
Answer:
The Plasma Membrane.
Explanation:
The eukoryotic cell is enclosed in a limiting membrane called the Plasma Membrane or Plasmalemma. ❤️
what is 2 multiplied by 4
Answers
Answer:
8
Explanation:
Answer:
the answer is 8 :D
Explanation:
2x4 also known as 2+2+2+2 is equal to 8
8.0 g of a monoatomic gas occupies 96.0 L at 380.9 mm Hg and 20.0 °C. What is the identity of the gas?
Answers
The monoatomic gas : He
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
P 380.9 mmHg = 0.5 atm
T 20 C+273 = 293 K
We can find molar mass of gas :
[tex]\tt M(molar~mass(M)=\dfrac{mRT}{PV}\\\\M=\dfrac{8~g\times 0.082\times 293~K}{0.5~atm\times 96~L}\\\\M=4~g/mol[/tex]
monatomic gas means a single element, usually a noble gas. The noble gas element with mass 4 is He
If a 200 kg person stands next to a 100 kg person. Which person would have a larger gravitational attraction?
Answers
Answer:
200 kg
Explanation:
the 200 kg person is heavier due to gravity's force the 100 kg person has less force than the other person
Answer:
massive one that is 200kg
Explanation:
Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
who is good at chemistry?! HMU asap!!!
Answers
Convert 3.30 g of copper (II) hydroxide Cu(OH)2 to molecules.
Answers
Answer:
0.18× 10²³ molecules
Explanation:
Given data:
Mass of copper hydroxide = 3.30 g
Number of molecules = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 3.30 g/97.56 g/mol
Number of moles = 0.03 mol
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
0.03 mol × 6.022 × 10²³ molecules / 1mol
0.18× 10²³ molecules