Answer:
See explanation
Explanation:
1) The reaction of magnesium with oxygen is;
Mg(s) + O2(g) -----> MgO2(s)
The oxidizing agent is the reactant whose oxidation number decreases from left to right in the reaction equation. The oxidation state of oxygen decreased from zero to -2 hence oxygen is the oxidizing agent in the reaction.
2) The advantages of fuel cell includes;
i) it is a clean source of energy
ii) Fuel cells operate quietly and do not constitute noise pollution
One disadvantage of the fuel cell is that its operation is costly.
3) Electrolytic and voltaic cell are similar because they are both electrochemical cells and involve a transfer of electrons between two electrodes.
Electrolytic cells do not operate spontaneously while voltaic cells operate spontaneously. In the volatic cell the anode is negatively charged while the cathode is positively charged. In the electrolytic cell, the anode is positively charged while the cathode is negatively charged.
How many grams of SO2 can be produced if
2.5 moles of O2 are used?
S2 + 2O2 → 2SO2
Answer: mass of SO2 is 160 g
Explanation: according to equation number of moles of SO2
Is same as amount of Oxygen, also 2.5 moles.
Molar mass of SO2 is 32.07 +2·16 = 64.07 g/mol
Mass is m= nM = 2.5 mol· 64.07 g/mol= 160.175 g
The term mole concept is used here to determine the mass of hydrogen. The mass of SO₂ produced from 2.5 moles of O₂ is 160.165 g.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The balanced reaction is given as:
S₂ + 2O₂ → 2SO₂
2 mole O₂ = 2 mol SO₂
Number of moles of O₂ = 2.5
Moles of SO₂ = 2.5 × 2 / 2 = 2.5 mol
The molar mass of SO₂ = 64.066 g/mol
Mass of SO₂ = 64.066 × 2.5 = 160.165 g
Thus the mass of SO₂ is 160.165 g.
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How many moles does 21.7 L of gas at STP represent?
Answer:
The number of moles represented by 21.7 L is 0.96875 moles
Explanation:
The volume occupied by one mole of a gas which consists of (approximately) 6.022 × 10²³ elementary at STP is 22.4 L. The volume is known as the molar volume of gas
Therefore, the number of moles, 'n', present in 21.7 L of gas at STP is given as follows;
The number of moles represented by 22.4 L = 1 mole
∴ The number of moles represented by 21.7 L = 1 mole/22.4 L × 21.7 L = 0.96875 moles
The number of moles represented by 21.7 L = 0.96875 moles.
Which element do all organic compounds contain?
Answer:
hydrogen oxygen or nitrogen
5)
Which statement is true about a liquid but not a gas?
A)
It has more internal energy than the solid state.
B)
It will change shape and take the shape of its container
C)
It allows particle to move past each other relatively easily.
D)
It has close to a constant volume as pressure is applied to it.
Answer:
D) It has close to a constant volume as pressure is applied to it.
This is true for liquids but not for gas because on changing the pressure volume of gas may not be constant always
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What type of reaction is the following:
lodine + Calcium + Calcium lodide
Answer:
This is called combination reaction
Which of the following molecules is correctly paired with its macromolecule class? (2 points)
Enzyme-nucleic acid
Cholesterol-protein
Glycogen-protein
RNA-nucleic acid
Ben wants to test whether the material used to make a disposable cup affects the amount of thermal energy transferred to a person's hand. He investigates by carefully pouring the same volume of 90°C water into a foam cup and into a paper cup.
Which additional step in the investigation will help Ben determine which material reduces thermal energy (heat) transfer to the hand of a person holding the cup?
A.Stir the water in each cup for 10 minutes before measuring its temperature.
B.Measure the outside surface temperature of each cup after 10 minutes.
C.Vary the amount of water held by each cup before measuring its temperature.
Answer:
The answer would be B
Explanation:
C does not make sense and A will not affect anything
Measure the outside surface temperature of each cup after 10 minutes is the additional step in the investigation.
What is Temperature?This is defined as the degree of hotness or coldness of a substance and is measured in Celsius or Kelvin.
Determining which material reduces thermal energy will involve measuring the outside surface temperature of each cup after 10 minutes for the difference.
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20g of butanedioic acid were shaken with a mixture of 100 cm3 ether and 100 cm3 water at 298K. After titration with standard sodium hydroxide, it was noted that the ether layer needed 12.4mL of 0.2 mol dm-3 solution for complete neutralisation. Calculate the partition co-efficient.
Answer:
I'm Not Good At Chemistry.
Explanation: It's Hard.
How is a less-intense wave different from a more-intense wave?
Answer:
A less-intense wave will have fewer decibels than a more-intense wave.
Explanation:
sound is measured in units called decibels (dB). The higher the decibel level, the louder the noise. On the decibel scale, the level increase of 10 means that a sound is actually 10 times more intense, or powerful.
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Calculate the number of moles of AL2O3 that are produced when 0.25 moles of fe is produced
2AL(s) + 3FeO(s)-----> 3Fe(s)+ Al2O3(s)
How many particles are in 4.50 grams of Potassium Carbonate? please show dimensional analysis
Are the cells in this image prokaryotic or eukaryotic
Answer:
Prokaryotic is the answer!
Explanation:
I know this because, the nucleolus is absent in the image.
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Hi :) can someone answer this thank u
what is called decomposition reaction question explain with chemical equation
Answer:
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
Explanation:
decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen
Question :
➠Define Intertia .
Answer:
The inability to change the position by itself is defined as inertia.
PLEASE HELP!!! Just need an answer, no explanation
Answer: N2
blah blah blah blah blah blah
Particle motion in ice is _________
than particle motion in water.
Answer:
slower(less faster)
the particles motion in a liquid state of a substance is faster than the particle motion in substance's solid state.
Particle motion in ice is slower than particle motion in water.
What is the motion of particles?The motion of particles is the random movement of the particles or electrons inside the atoms. These movements happen due to an increase in temperature or heat.
There are three types of matter, solid, gas, and liquid. These matters have different particle movements. Because these matters have different organizations of charged particles within them.
As ice is solid, the particles in solid have compact particle present. These particles are near to each other and do not move. And water is liquid, its particles move randomly. As liquid move and get the shape of the container. Its particles are in motion.
Thus, particle motion in ice is slower than particle motion in water.
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Select some particular plant or animal and find out how it has been improved because of the study of genetics. The following examples are given, but you may select some other topic if you like. Be sure that you have the topic and the method (written or oral) of reporting approved before you do your research. If you choose an oral report, it should be at least 3 minutes in length. If you choose a written report it should be at least 500 words in length.
Do some research into thornless varieties of plants.
What plants are available which do not have thorns?
Is thornlessness a mutation?
When and where was the possibility of growing thornless varieties of plants discovered?
How do these varieties compare with the variety that has thorns?
Consult seed catalogs, gardening books, and magazines in the library.
Do some research into the new variety of pumpkins that do not have hulls on their seeds.
Is the flavor of the new variety as good as the flavor of the older varieties, or is the new variety raised only to have seeds without hulls?
How are the seeds prepared?
Is the pumpkin seed a good source of protein?
Consult seed catalogs, gardening books, and gardening magazines.
Study the potato famine in Ireland.
Study how the use of some modern types of potatoes can help to overcome such famines.
Give some examples of potatoes which are hardy against disease.
Study the careful breeding experiments that resulted in disease resistant potatoes.
What makes them hardier and more disease resistant?
What makes them hardier and more disease resistant?
Do some research to find out about the new breeds of cattle that provide much better beef than the older breeds.
Consult a genetics book from the library to determine the names of such cattle.
what makes these breeds better? Are they cared for the same way? Do they have any drawbacks in terms of cost of breeding and raising?
You may want to investigate some of the diseases which are inherited.
Consult a genetics textbook from the library.
You may also need to look up some of these in a medical textbook or the Journal of Heredity.
Who is more likely to inherit them? Why?
Which buffer system is found in the human body?
O formate buffer system
O acetate buffer system
O bicarbonate buffer system
fat buffer system
Answer: C. bicarbonate buffer system
The bicarbonate buffer system helps to regulate the pH levels of our body.
A healthy pH range is about 7.35 to 7.45.
Hope this helps!
The statement describes buffer system is found in the human body is "bicarbonate buffer system."
What is buffer system?When acids or bases are introduced to a buffer system, the pH of the solution does not change. A weak acid and its salt or a weak base and its salt make up a buffer system.
Carbonic acid bicarbonate buffer system, phosphate buffer system, and protein buffer system are the three major buffer systems in our bodies. The principal buffering mechanism of the IF surrounding the cells in tissues throughout the body is the bicarbonate buffer. By eliminating CO2 and hydrogen ions from the body, the respiratory and renal systems play important roles in acid-base balance.
Hence the correct answer is bicarbonate buffer system.
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The greenhouse effect is caused by a building up in the atmosphere. Which of the following gases is a concern?
a. sulfur dioxide
b. carbon dioxide
c. oxygen
d. nitrous oxide
Answer:
b
Explanation:
it is a major culprit in global warming
Answer:
B. Carbon dioxide.......
Calculate the number of moles in 3.01 x 10²² atoms of calcium.
Answer:
Using dimensional analysis:
3.01x1022 molecules CO2 x 1 mol CO2/6.02x1023 molecules x 44. g CO2/mole = 2.20 g CO2
Explanation:
im struggling and dont want to fail
Answer: Hey I am sure you will do great just try your best
Explanation:
To protect their crops during freezing temperatures, orange growers spray water onto the trees and allow it to freeze. In terms of energy lost and energy gained, explain why this practice protects the oranges from damage.
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When water freezes, it is an exothermic change. The oranges absorb this energy which is an endothermic change and do not freeze.
ThanksHope it helps.How many moles are in 7.777x 10^24 molecules of Mg2. Watch your significant
figures
Answer:
12.91 moles of Mg₂, 8.4x10²⁴ atoms of I.
Explanation:
The number of molecules of any chemical substance is converted to moles using Avogadro's number (That is 6.022x10²³ molecules / mol) :
7.777x10²⁴ molecules * (1mol / 6.022x10²³molecules) =
12.91 moles of Mg₂As you can see, there are 4 significant figures in the number of molecules and the answer of moles.
In the same way, 14 moles of I are:
14 moles I * (6.022x10²³ atoms / mol) =
8.4x10²⁴ atoms of IA container has an unknown quantity of gas at a pressure of 121.6kPa, a volume of 31L and a temperature of 87oC. How many moles of gas are present ?
Answer:
1.26mol
Explanation:
Using the general gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K).
Based on the information provided in this question,
P = 121.6kPa = 121.6 × 0.00987atm = 1.2001 atm
V = 31L
T = 87°C = 87 + 273 = 360K
R = 0.0821 Latm/molK
Using PV = nRT
n = PV/RT
n = (1.2001 × 31) ÷ (0.0821 × 360)
n = 37.2031 ÷ 29.556
n = 1.258
n = 1.26mol
In an exothermic the change in enthalpy is usually
Positive, because the potential energy of the reactants is higher than the potential energy of the products
Neutral, because the potential energy of the products and reactants cancel each other out.
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Positive, because the potential energy of the reactants is lower than the potential energy of the products
Answer:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Explanation:
Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e
Enthalpy change = Heat of product – Heat of reactant
ΔH = Hp – Hr = negative
Considering the options given in the question above, the correct answer is:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
If the speed of light is 3.0 × 108 m/s2, then how much energy would be released if a 23.7 gram object is converted to pure energy?
A. 2.133 x 10^15 J
B. 3.797 x 10^18 J
C. 7.11 x 10^6 J
D. 2.133 x 10^18 J
Answer:
B:
Explanation:
Hopes this help best friends.
Answer:
D
Explanation:
Cause b is not the right answer and when calculating you get D So I hope you guys understand
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3. Which side of the chain should you count from when naming organic compounds?
A) Center
B) Right side
C) Side that will give you the longest Carbon chain
D) Left side
4. What is the pH of a solution with a pOH of 10?
A) 6
B) 14
C) 4
D) 10
Answer:
3. Which side of the chain should you count from when naming organic compounds?
C) Side that will give you the longest Carbon chain
4. What is the pH of a solution with a pOH of 10?
C) 4
pH + pOH = 14
pH + 10 = 14
pH = 14 - 10
pH = 4
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A student wants to know how many grams of water are made from 5.00g of oxygen gas. Which step goes in the spot with the
question mark?
Answer:
5.6 grams of water.
Explanation:
Please, notice that we can't see the spot with the question mark, so I will answer the question completely step by step.
We know that water is made from two hydrogen molecules and one oxygen molecule.
By looking at the atomic weight, we know that the weight of one mole of oxygen is:
16 grams.
While the weight of one mole of hydrogen is 1 gram (and we have two of these)
Then we have a total mass of 16 g + 2 g = 18 g
Now let's find what fraction of this is the oxygen, here we just need to take the quotient between the mass of oxygen and the total mass:
16g/18g = 0.89
Now, this means that if we have M grams of pure water, then we will have:
0.89*M grams of oxygen.
Ok, now let's use this to solve our problem, we want to find how many grams of water are made from 5 grams of oxygen.
Then let's write:
5 grams = 0.89*M grams
Where M represents the grams of water that we would get, here we just need to isolate M.
M = (5 g/0.89) = 5.6 grams
This means that out of 5 grams of oxygen, we can make 5.6 grams of water.
what type of bonding is occuring in the compound below?
Answer:
D.Metallic
Explanation:
The metallic model is often characterized as a "sea of electrons". This is because the electrons delocalize from the ion's orbitals, allowing them to roam freely around the substance. This is what the model is showing.
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