Answer:
A group of cells working together is defined as a tissue and several tissues working together comprise an organ.
Explanation:
A solution of Co(NO₃)₂ is electrolyzed using a 15.0A current for 1.00 hour and Co(s) is produced at the cathode. Calculate the moles of electrons that was used to electrolyze the solution? Calculate the moles and mass of Co(s) produced at the cathode?
Answer:
1. 0.56 mole of electron.
2. 0.28 mole of Co .
3. 16.52g of Co.
Explanation:
The following data were obtained from the question:
Current (I) = 15A
Time (t) = 1 hr = 1 x 60 x 60 = 3600secs
Next, we shall determine the quantity of electricity, Q flowing in electrolyte. This is illustrated below:
Quantity of electricity (Q) = current (I) x Time
Q = It
Q = 15 x 3600
Q = 54000C.
1. Determination of the moles of electrons used to electrolyzed the solution. This is illustrated below:
96500C = 1 mole of electron
Therefore, 54000C = 54000/96500 = 0.56 mole of electron.
Therefore, 0.56 mole of electron was used to electrolyze the solution.
2. Determination of the number of mole of Co produced at the cathode. This is illustrated below:
At the cathode:
Co2+ + 2e —> Co
From the balanced equation above,
2 moles of electron produce 1 mole of Co.
Therefore, 0.56 mole of electron will produce = 0.56/2 = 0.28 mole of Co.
Therefore, 0.28 mole of Co is produced at the cathode.
3. Determination of the mass of Co produced at the cathode. This can be achieved by doing the following:
Molar mass of Co = 59g/mol
Number of mole of Co = 0.28 mole
Mass of Co =..?
Mass = mole x molar mass
Mass of Co = 0.28 x 59
Mass of Co = 16.52g
Therefore, 16.52g of Co is produced at the cathode.
Describe the differences seen in the properties of Boron and Nitrogen.
Answer:
Explanation:
As you move from left to right in periodic table the size of atom size decreases, electrongeativity increases.
it mean
Boron is bigger in size than Nitrogen
Boron is less electroneagive than Nitrogen.
can you find simialr to this another factor to realte
If the mass of a certain block is 500g, what is the weight of the block?
______________________________
Solution,
Mass=500g =500/1000=0.5 kg
gravity(g)=9.8m/s^2
Now,
Weight= m*g
= 0.5*9.8
=4.9 N
So the weight of the block is 4.9 Newton
hope it helps...
Good luck on your assignment
_______________________
What is the molar mass of silver oxide (Ag2O)
Answer:
231.735 g/mol
Explanation:
Using distributive property solve 9×19
Answer:
9*(10+9)
(90+81)
(171) is the answer
How many moles are there in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid?
Answer:
0.25moles
Explanation:
There are 1000[tex]cm^{3}[/tex] for 1[tex]dm^{3}[/tex]
Therefore in 1000[tex]cm^{3}[/tex] of 0.5 mol/[tex]dm^{3}[/tex] solution has = 0.5 moles
Therefore 500[tex]cm^{3}[/tex] contains = 0.5/1000 x 500 = 0.25moles
The number of moles of sulfuric acid in 0.5 mol/dm³ solution is equal to 0.25 mol.
What is the molarity?The concentration of the solution can be determined as the number of moles of a solute in per unit volume of a solution is known as molarity or molar concentration.
The Molarity of the solution is calculated in the following formula:
Molarity (M) = Moles (n)/Volume of the Solution (in L)
Now if we have to find the number of moles of solute in the solution, the formula becomes:
Number of moles of solute (n) = Molarity (M) × Volume of the Solution
Given, the concentration of the sulfuric acid solution = 0.5 mol/dm³
The volume of the solution, V = 500 cm³
As we know, 1 dm³ = 10³ cm³, the volume of solution = 0.5 dm³
The number of moles of the sulfuric acid = M × V
= 0.5 × 0.5 = 0.25 mol
Therefore, 0.25 moles of sulfuric acid in 500cm3 of a 0.5mol/dm³ solution of sulfuric acid.
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What does the kinetic theory say about the kinetic energy present in solids
Answer: The kinetic energy of solids is limited to vibrational energies..the particles are tightly bound in their crystalline structure and can only bend, flex, and vibrate about relatively fixed position. When vibrational energies exceed the strength of the force holding the particles together, the crystal structure collapses and we say the material melted. The particles can now have, in addition to its vibrational energies, rotational energy. Chunks of the collapsed crystal can, like a ball floating in water, rotate without showing much translational energy. Generally, we associate solids with vibrational kinetic energy, liquids with rotational kinetic energy, and gases with translational kinetic energy. Actually though, liquids have both vibrational and rotational energies, and gases have all three.
Se hacen reaccionar 100 g del agente oxidante con 25 g del agente reductor, según la reacción REDOX LaTeX: N_2\left(g\right)+H_2\left(g\right)\longrightarrow NH_3\left(g\right)N 2 ( g ) + H 2 ( g ) ⟶ N H 3 ( g ) Indique el reactivo en exceso y los gramos de amoniaco formado, si la eficiencia del proceso es del 80 %
Answer:
El reactivo en exceso es hidrógeno
97.12g NH₃ son formados
Explanation:
Basados en la reacción:
N₂(g) + 3 H₂(g) → 2 NH₃(g)
El hidrógeno pasa de estado de oxidación 0 a estado de oxidación +1. Al perder un electrón se oxida y es el agente reductor.
El nitrógeno pasa de estado 0 estado -3. Al ganar 3 electrones se reduce y es el agente oxidante.
100g de N₂ son (Peso molecular: 28g/mol):
100g × (1mol / 28g) = 3.57 moles de N₂
Y 25g de H₂ son (Peso molecular: 2g/mol):
25g × (1mol / 2g) = 12.5 moles de H₂
Como 3 moles de hidrógeno reaccionan por mol de nitrógeno, las moles de nitrógeno que se necesitan para hacer reaccionar completamente 12.5 moles de hidrógeno son:
12.5 moles H₂× (1 mol N₂ / 3 moles H₂) = 4.17 moles de nitrógeno.
Como hay 3.57 moles de nitrógeno, el reactivo en exceso es hidrógeno.
Como el reactivo limitante es el nitrógeno y 1 mol de nitrógeno produce 2 moles de amoniaco, las moles de amoniaco son:
3.57 moles de N₂ × (2 moles NH₃ / 1 mol N₂) = 7.14 moles de NH₃
La masa producida idealmente es:
7.14 mol NH₃ ₓ (17g/mol) = 121.4 g de NH₃. Como la eficiencia del proceso es del 80%:
121.4 g NH₃ × 80% = 97.12g NH₃ son formados
Answer:
Excess reactant: H₂
Mass of produced ammonia, 97.1 g
Explanation:
Identify the reaction:
N₂ + 3H₂ → 2NH₃
We identify the reducing agent and the oxidizing agent:
N₂ changed the oxidation state from 0 to -3. This is the reduction, so it is the oxidizing agent. By the way the H₂ is the reducing agent.
We convert the mass to moles:
100 g / 28 g/mol = 3.57 moles of N₂
25 g / 2 g/mol = 12.5 moles of H₂
Ratio is 1:3. For 1 mol of nitrogen, we need 3 moles of hydrogen
Then, 3.57 moles of N₂ would need (3.57 . 3) / 1 = 10.7 moles
We have 12.5 moles of H₂, so the hydrogen is the excess reactant and the nitrogen is the limiting.
To produce ammonia, the reaction needs 1 mol of N₂, that can produce 2 moles of product
3.57 moles of N₂ will produce (3.57 . 2) / 1 = 7.14 moles of NH₃
As yield reaction is 80%, we will produce 7.14 mol . 0.80 = 5.71 moles
We convert the moles to mass: 5.71 mol . 17 g / 1mol = 97.1 g
Predict your observation if a magnesium ribbon is put in potassium hydroxide solution and tested with a lighted wooden splinter.
mg reacts with the acid and produce visible bubbles of hydrogen gas. they will produce audible pops as the hydrogen ignites. ... Hydrochloric acid is a corrosive liquid. Hydrogen gas is explosive.
If the temperature outside is 297 what is this temperature in degrees celsius
Answer:
147.222 degrees C
Explanation:
assuming its 297 F it should be correct
The temperature outside is 297°F then this temperature in celsius is equal to 147.22 °C.
How to convert from Fahrenheit to celsius?Temperature can be described as a physical quantity that expresses quantitatively the perceptions of hotness or coldness. The most general scales are the Celsius scale with (°C), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes.
Fahrenheit to Celsius formula can be used to change the temperature from the scale Fahrenheit to degrees Celsius.
The formula that can be used to convert Fahrenheit to Celsius is given below:
[tex]\dusplaystyle ^oC = (^oF - 32) \times \frac{5}{9}[/tex]
Here, F represents the temperature in Fahrenheit, and C represents the temperature in Celsius.
Given the temperature in Fahrenheit = 297 °F
[tex]\dusplaystyle T( ^oC) = (297 - 32) \times \frac{5}{9}[/tex]
T = 147.22 °C
Therefore, the given temperature in celsius is equal to 147.22 °C.
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The compound represented by this formula can be classified as an
Answer:
It depends what formula you are talking about.
Explanation:
please further explain so I can be sure.
A.
B.
C.
D.
what’s the correct answer?
Answer:
C Gamma Rays
Explanation:
Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation. In order from highest to lowest energy, the sections of the EM spectrum are named: *gamma rays* ,X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.
The mass of an object is measured in _____. liters meters degrees kilograms
Inorganic compounds which are found in the earth are called: minerals vitamins synthetics cement
Answer:
Minerals
Explanation:
I looked it up on google. Thanks.
Which of the following statements describes electromagnetism?
Answer:
c)Magnetism can cause electrons to flow, and electricity can make a wire magnetic.
Explanation:
If this is your question:
Which of the following statements describes electromagnetism?
a)Magnetism and electricity are both used by society to do work.
b)Magnetism and electricity both include protons and electrons.
c)Magnetism can cause electrons to flow, and electricity can make a wire magnetic.
d)Electrons are attracted to the protons in magnets.
Answer:
magnetism can cause electrons to flow, and electricity can make a wire magnetic
Explanation:
a p e x :)
Which of the following is a polyatomic ion?
O A N₂
B. HCl
O C. S2
O D. PO43-
Answer:
The answer is D..i.e phosphate. it consists of 1p and 4oxygen atoms
[tex]PO_4^{3-}[/tex] is a polyatomic ion. Hence, option D is correct.
What is a polyatomic ion?
Polyatomic ions are ions which consist of more than one atom.
The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.
[tex]PO_4^{3-}[/tex] is a chemical derivative of phosphoric acid with a chemical name Phosphate. Phosphate is also called Phosphate ion or Orthophosphate.
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Describe how a polyploid is formed
Answer:
ExpPolyploidy is the heritable condition of possessing more than two complete sets of chromosomes. Polyploids are common among plants, as well as among certain groups of fish and amphibians. For instance, some salamanders, frogs, and leeches are polyploids. Many of these polyploid organisms are fit and well-adapted to their environments. In fact, recent findings in genome research indicate that many species that are currently diploid, including humans, were derived from polyploid ancestors (Van de Peer & Meyer, 2005). These species that have experienced ancient genome duplications and then genome reduction are referred to as paleopolyploids. This article discusses the mechanisms underlying polyploidy, and both the advantages and disadvantages of having multiple sets of chromosomes.
Mechanisms of Polyploidy
This diagram shows several pathways by which diploid species can transition to polyploid species and polyploid species can transition to diploid species. Each species is represented by an oval containing two or more colored circles. Each colored circle represents a complete set of chromosomes.
View Full-Size ImageFigure 1
Figure Detail
How does an organism become polyploid? Polyploids arise when a rare mitotic or meiotic catastrophe, such as nondisjunction, causes the formation of gametes that have a complete set of duplicate chromosomes. Diploid gametes are frequently formed in this way. When a diploid gamete fuses with a haploid gamete, a triploid zygote forms, although these triploids are generally unstable and can often be sterile. If a diploid gamete fuses with another diploid gamete, however, this gives rise to a tetraploid zygote, which is potentially stable. Many types of polyploids are found in nature, including tetraploids (four sets of chromosomes), hexaploids (six sets of chromosomes), and other chromosome-pair multiples
The three states of matter can be arranged in the increasing order of interparticle forces as 1) gas > liquid >solid 2) solid >liquid > gas 3) liquid > gas > solid pls answer fast
Answer:
OPTION 2 SOLID>LIQUID>GAS
Explanation:
because the inter molecular forces are the strongest in the solid than in liquid and than in gas
what is the symbol for Lithium, Iron, and Helium
Lithium=li
Iron=Fe
Helium=He
I don't say u must have to mark my ans as brainliest but if u think it has really helped u plz don't forget to thank me....
Answer:
lithium symbol=li helium= he and iron =i
) What is the definition of an enzyme? A.Enzymes are carbohydrate molecules that act as catalysts to speed up chemical reactions in living things. B.Enzymes are polymer molecules that act as catalysts to slow down chemical reactions in living things. C.Enzymes are protein molecules that act as catalysts to speed up chemical reactions in living things. D.Enzymes are fat molecules that act as catalysts to speed up chemical reactions in living things. E.Enzymes are protein molecules that act as catalysts to slow down chemical reactions in living things.
Answer:
option c
enzymes are protein molecules that act as catalysts to speed up bio chemical reactions
1. Calculate the pH of a 0.35 mol/L solution of ammonia.
Answer:
Explanation:
NH3 + H2O ⇌ NH4 + OH-
0.35 0.35
-log[OH-] = -log0.35 = 0.46 = pOH
14 - 0.46 = 13.54 = pH
How many significant figures does 5.750 have?
Answer:
4
Explanation:
I NEED HELP PLEASE, THANKS! :)
Respiration is a three-step process that breaks down glucose and produces ATP. What are those three steps? Explain.
Answer:
Ok so the first step is glycolysis(which involves 10 different 'steps') which is conducted in the cytosol, so this is where glucose breaks down into two molecules of pyruvate.
The breakdown of glucose releases energy which changes ADP to ATP and NAD+ to NADH.
The second step is commonly known as the Krebs Cycle or Citric Acid Cycle(involves 11 steps). This is where pyruvate is broken down into 3CO2.
The breakdown of pyruvate releases energy which changes ADP to ATP, NAD+ to NADH and FAD+ to FADH2
The third step is known as oxidative phosphorylation, this is where energy from NADH and FADH2 is used to generate a H+ gradient, which changes ADP to ATP.
Answer:
Glycolysis, Citric Acid Cycle, and the Electron Transport Chain
Explanation:
Cellular respiration is the process in which cells break down glucose and release the stored energy to make ATP.
Step 1 — Glycolysis
Glycolysis is the conversion of glucose — a C₆ molecule — into two C₃ (pyruvate) fragments.
Step 1a. The linking reaction — pyruvate oxidation
In preparation for the second step, each pyruvate ion loses a carbon atom as CO₂ and forms a two-carbon acetyl group.
The acetyl group is transferred to Coenzyme A to produce acetyl CoA.
Step 2 — the Citric Acid Cycle (CAC)
The acetyl CoA enters the CAC.
In various redox reactions, the C atoms in the acetyl group are oxidized to CO₂.
The electrons are passed to energy-storing molecules like NADH and FADH₂.
3. Step 3 — the Electron Transport Chain (ETC)
The NADH and FADH₂ pass their electrons to the Electron Transport Chain
In a series of redox reactions, the electrons reduce oxygen to water.
The energy released converts ADP to ATP (oxidative phosphorylation)
The whole purpose of respiration is to oxidize glucose to CO₂ and water and use the energy produced to form ATP.
One molecule of glucose produces 2 ATP in glycolysis, 2 in the CAC, and 34 in the ETC.
explain why an indicator is used in titration
Answer:
Titrations. Because a noticeable pH change occurs near the equivalence point of acid-base titrations, an indicator can be used to signal the end of a titration. When selecting an indicator for acid-base titrations, choose an indicator whose pH range falls within the pH change of the reaction.
Hope it helped!!
A 14.00-g piece of iron absorbs 1000 joules of heat energy, and its temperature changes from 25°C to 125°C. Calculate the specific heat capacity of iron.
Answer:
THE SPECIFIC HEAT OF IRON IS 0.714 J/g °C
Explanation:
Heat absorbed = 1000 J
Mass of the piece of iron = 14 g
Temeperature changes = ( 125-25)°C= 100°C
specific heat of iron = unknown
To find the specific heat of iron in the question use the formula of heat
Heat = mass * specific heat * temperature change
Specific heat = Heat / mass * temperature change
Specific heat = 1000 / 14 * 100
Specific heat = 1000 / 1400
Specific heat = 0.714 J/g °C
So therefore, the specific heat of iron is 0.714 J/g °C
Which of the following contribute(s) to most of the mass of an atom?
O A) Protons and electrons
B) Protons only
C) Protons and neutrons
OD) Neutrons only
Answer:
C) protons and neutrons
Explanation:
im pretty sure it is c
A student places a 12-gram cube of Ice Inside a container. After six hours, the student returns to observe the contents of the container. Which
sentence suggests that the container is an open system?
ОА
The container contains 12 grams of liquid water and no ice.
B.
The container contains 12 grams of Ice and no liquid water.
D.
The container contains 8 grams of liquid water and no ice.
The container contains 8 grams of ice and 4 grams of liquid water.
The container contains 8 grams of liquid water and 4 grams of water vapor.
E
Answer:
I think its D sorry if im wrong
Answer:i think its D
Explanation:
HELP!!!!!!!!!!!!!!!! PRETTY PLEASE !!!!!!!!!!!!!!!!
Answer:
B. 75.0 kPa
Explanation:
P1V1/T1=P2V2/T2
(x * 100 L)/(300 K)=(100 kPa * 50.0 L)/(200 K)
x=75.0 kPa
Answer:
24rq3r54
Explanation:
3t5q6tq6tq
How does the mass and height of an object affect the gravitational potential energy?
Answer: The higher up an object an is the greater it’s gravitational potential energy. This is because a tree has more mass, so it needs to be given more gravitational potential energy to reach the same height. So a change in gravitational potential energy also depends on the mass of the object that is changing height
Explanation:
The gravitational potential energy (P.E) depends on the mass of the body and the height at which it travels, the two quantities will therefore dictate the work done on the object which is eventually the same as magnitude of the gravitational potential energy P.E.
It is assumed that gravitational pull acts toward the earth surface. The more the object move upward the more the work is done on the object to pull it down.
This work done is equal to the gravitational potential energy P.E which can be expressed as:
P.E = mgh
Where
m = mass of the body
g = gravitational field strength
h = height
We can have different masses of object at different heights, but gravitational field strength will always remain constant on earth.
Since the gravitational potential energy P.E depend on the mass of the body and the height at which it travels, the two quantities will therefore dictate the work done on the object which is eventually the same as magnitude of the gravitational potential energy P.E.
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This formula equation is unbalanced. Pb(NO3)2(aq) + Li2SO4(aq) Right arrow. PbSO4(s) + LiNO3(aq) Which coefficient should appear in front of LiNO3 in the balanced equation? 1 2 3 4
Answer:2
Explanation:
Answer:
2
Explanation:
