Answer:
See below.
Explanation:
1) Magnesium oxide MgO and copper metal (Cu).
2) Mg + CuO ---> MgO + Cu.
Magnesium oxide MgO and copper metal (Cu) products of the reaction
The balanced equation for the chemical reaction is
Mg + CuO ---> MgO + Cu.
What are the steps for writing a balanced equation ?The chemical equation represents two sides separated by an arrow where the left side indicates reactants and right side indicate the products.
it also represent the formulas of the participant elements, their phases like solid, liquid, gas, the direction of the reaction, and the amount of each substance.
Chemical equations will be balanced marking their mass and charge which means the number and type of atoms on the left side is the same as the number of type of atoms on the right side.
The overall electrical charge of the reaction on both the left side and right side will be same for the equation.
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Like DNA, RNA contains four nitrogenous bases.
Three of them are the same as those found in
DNA. The one that is different is called
The five-carbon sugar in RNA is called
Answer:
Uracil, Ribose
Explanation:
The Nitrogenous base found in RNA that is not found in DNA is called Uracil.
While the five-carbon sugar in RNA is called Ribose.
Answer:
Uracil and then Ribose
Explanation:
A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation.
H3C6H507+3NaHCO3->3CO2+3H20+Na3C6H507
What is the theoretical yield of carbon dioxide? 0.993 g 2.98 g 3.65 g 8.93 g
Answer:2.98
Explanation:
Answer:
D) 8.93 g
Explanation:
Which noble gases can form compounds and under what conditions? Give EXAMPLES
Answer:
Following
Explanation:
The overall process of photosynthesis has the balanced chemical equation 6CO, +6H,0 CH.0, 60, What does this tell you about the relative amounts of carbon
dioxide and water consumed in this process?
A. For every six moles of carbon dioxide consumed, one mole of water is consumed
B. For every mole of carbon dioxide consumed, one mole of water is consumed
C. For every gram of carbon dioxide consumed, one gram of water is consumed
D. For every six grams of carbon dioxide consumed, one gram of water is consumed.
Answer:
(C)
Explanation:
Because of the physics of it.
According to the overall equation of photosynthesis as follows: 6CO2 + 6H2O = C6H12O6 + 6O2, for every mole of carbon dioxide consumed, one mole of water is consumed.
What is photosynthesis?Photosynthesis is the process by which plants and other photoautotrophs convert light energy into chemical energy.
Photosynthesis makes use of carbon dioxide and water to produce glucose and oxygen as follows:
6CO2 + 6H2O = C6H12O6 + 6O2
This chemical equation suggests that for every mole of carbon dioxide consumed, one mole of water is consumed.
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The common isotopes of carbon are 12C and 13C. The average mass of carbon is 12.01115 amu. What is the abundance of the 13C isotope? A. 1.115% B. 98.885% C. 0.480% D. 99.52% Provide an explanation if possible. Thanks so much!
Answer:
The abundance of the 13C isotope is 1.115%
Explanation:
The given information are;
Common isotope of carbon are 12C and 13C
The formula for calculating the relative atomic mass is the observed mass multiplied by the percentage abundance at that mass given as follows;
M₁ X₁ + M₂X₂ = Relative atomic mass
Where:
X₁ + X₂ = 1 as these are percentage represented as fractions
Let M₁ = 12 for 12C and M₂ = 13 for 13C
X₁ = Relative abundance fraction of 12C
X₂ = Relative abundance fraction of 13C
We have;
12X₁ + 13X₂ = 12.01115.......................(1)
X₁ + X₂ = 1............................................(2)
Which gives;
X₁ = 1 - X₂
Substituting the value for X₁ in equation (1) gives;
12(1 - X₂) + 13X₂ = 12.01115
13X₂ - 12X₂ + 12 = 12.01115
X₂ = 12.01115 - 12 = 0.01115
Therefore, the relative abundance fraction of 13C 0.01115 which in percentage is 100 × 0.01115 = 1.115%.
Calculate the heat of reaction, ∆H°, for the following:
3FeCl2(s) + 4H2O(g) Fe3O4(s) + 6HCl(g) + H2(g)
Answer:
562.76 kJ
Explanation:
∆H° (kJ) is the total of the heats of formation of the products minus the total of the heats of formation of the reactants.
NB: look up the heats of formation of the compounds in the heats of formation reference tables, it is found at the back of most chemistry text
heats of formation of the products (i.e. Fe₃O₄(s) , 6HCl(g) , H₂(g) ) = -1120.9 + 6(-92.3)+ 0 = -1674.7 kJ
heats of formation of the reactants (i.e. 3FeCl₂(s) , 4H₂O(g) ) =3(-423.42) + 4(-241.8) = -2237.46kJ
∆H° = -1674.7 kJ - (-2237.46kJ) =562.76 kJ
In what way does the shape of a molecule affect how the molecule is involved with living systems?
A. It determines the weight of a molecule
B. it determines what elements are in a molecule
C. it determines oxidation states present in a molecule
D. it determines how the molecule functions
There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the correct option is option D.
What is VSEPR theory?VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.
According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element. The shape of a molecule affect how the molecule is involved with living systems as it determines how the molecule functions.
Therefore, the correct option is option D.
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What is the shape of a molecule of CH4?
O A. Trigonal-bipyramidal
O B. Bent
O C. Trigonal-pyramidal
O D. Tetrahedral
Answer:
D. Tetrahedral
Explanation:
the reason is because four electron pairs are distributed.
what’s the mass of 2.80 mol of ca
Answer:
112.22 g
Explanation:
mass = no. of moles x atomic mass
From the periodic table, we can see the atomic mass of Ca is 40.078.
Therefore,
mass = 2.80 x 40.078
= 112.22g (corrected to 2 decimal places.)
How many moles of Au atoms are present in one ounce of pure gold? [1 oz = 28.4 g]
Answer:
3.36x10^27 atoms
molar mass of c16h19n305s
Answer:
365.212
Explanation:
According to the given situation, the calculation of molar mass is shown below:-
Data provided
[tex]c_{16}\ h_{19}\ n_3\ o_5\ S[/tex]
Molar mass = 16 × 12 + 19 × 1.008 + 3 × 14 + 5 × 16 + 32.06
= 192 + 19.152 + 42 + 80 + 32.06
Molar mass = 365.212
Therefore for determining the molar mass we simply solve the above equation.
So, the correct answer is 365.212
Bee stings release methanoic acid which attacks the nerves in the skin. They can be
neutralized by applying a cream that contains
a) ammonia
b) vitamin C
c) sulphur dioxide
d) acetic acid (vinegar)
Answer:and so an acid should be applied to neutralize them and remove the pain.
Explanation:Bee and Wasp stings can be both painful and itchy, and are very common ... Many common household substances can be used for this, and vinegar and ... If you are near other Bees and Wasps,
Ammonia can be used to neutralise. Hence, option A is correct.
What is methanoic acid?It is the simplest carboxylic acid which consists of a single carboxylic acid group (COOH) which is attached to a hydrogen atom.
Ammonia is a great way to help neutralise the venom of a bee sting. All you need to do is create a thick paste out of baking soda and water and apply it to the sting.
Hence, option A is correct.
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How many grams of NO are produced from 15.8 g of H2O
Answer:
26.33 g of NO.
Explanation:
We'll begin by writing the balanced equation to produce NO from H2O. This is given below:
5N2 + 6H2O —> 4NH3 + 6NO
Next, we shall determine the mass of H2O that reacted and the mass of NO produced from the balanced equation. This is illustrated below:
Molar mass of H2O = (2x1) + 16 = 18 g/mol
Mass of H2O from the balanced equation = 6 x 18 = 108 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 6 x 30 = 180 g
From the balanced equation above,
108 g of H2O reacted to produce 180 g of NO.
Finally, we shall determine the mass of NO produced by the reaction of 15.8 g of H2O.
This is illustrated below:
From the balanced equation above,
108 g of H2O reacted to produce 180 g of NO.
Therefore, 15.8 g of H2O will react to produce = (15.8 x 180)/108 = 26.33 g of NO.
Therefore, 26.33 g of NO were obtained from the reaction.
Consider preparing ammonia gas by the following reaction:
N2(g) + 3H2(g) ===> 2NH3(g)
If you have 28.02 g of N2 and excess H2, how many grams of NH3(g) can be produced.
6.06g
14.01g
34.08 g
68.16 g
28.02g
Answer:
34.08g
Explanation:
(Take the atomic mass of N=14.0, H=1.0)
no. of moles = mass / molar mass
no. of moles of N2 used = 28.02 / (14x2)
= 1 mol
Since H2 is in excess and N2 is the limiting reagent, the no. of moles of NH3 produced depends on the no. of moles of N2 used.
From the equation, the mole ratio of N2:NH3 = 1: 2,
which means one mole of N2 produces 2 moles of NH3.
From the ratio, we can deduce the no. of moles of NH3 produced = 1 x 2 =2moles.
Mass = no. of moles x molar mass
Mass of NH3 produced = 2 x (14.0+1.0x3)
= 34g
≈34.08g (this happens because the atomic mass I took is only corrected to 1 decimal place, but in the end, this is only a very small error in the decimals. Make sure you take a look if the question provides the atomic mass:) )
Plants can only
cause mechanical weathering.
Please select the best answer from the choices provided
OT
OF
Answer:
Ice wedging, pressure release, plant root growth, and abrasion can all cause mechanical weathering. in the cracks and pores of rocks, the force of its expansion is strong enough to split the rocks apart. This process, which is called ice wedging, can break up huge boulders.
Answer:
f
Explanation:
1. Give IUPAC for the following compound
Answer:
Ethane
Explanation:
Which phrase describes an irregular galaxy?
O has a round shape
O contains many young stars
O has arms that extend from the center
O is larger than other types of galaxies
Answer: The answer would be B. contains many young stars.
Explanation:
There is very little new star formation in Irregular galaxies. Irregular galaxies have no particular shape and are smaller than other types of galaxies.
The irregular galaxy possess many young stars.
Irregular galaxyThey are the most unusual of galaxies.
They do not fit into either the elliptical or spiral galaxy categories.
They do not possess nice spiral arm, however, they do possess dark patches of dust and gas.
The irregular galaxies do not possess definite shape.
They comprise of several young stars as the extent of the formation of stars in irregular galaxies in brisk. They also do comprise old stars.
Thus, the correct statement is contains many young stars.
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What would form a solution
We learned about three career opportunities in the field of pulp and paper in class. Pick one career and find out the education, training, and experience required for this profession. Write about what you found and explain why this profession might interest you
Answer:
Pulp and Paper technology is a specialist field of chemical engineering which involves the study of the processes required for the conversion of raw materials such as wood, into pulp and paper products.
Paper and pulp manufacturing is a growing and dynamic industry so it requires a wide variety of personnel - from unskilled and semi-skilled workers to tradesmen, technicians and engineers - to control all the processes and develop new ones.
I choose to be a chemist in the field of paper and pulp. Requirements and compulsory Subjects: Physical Sciences, Mathematics, Engiineering and Technology.
Chemists are responsible for quality control and they study the influence of various chemicals on pulp and paper. Chemical and mechanical engineers develop new production methods.
I'll like to be a chemist in the field of paper and pulp because they perform the major role in the chemical properties of the paper and pulp.
Explanation:
Hope it helps.
Answer:
PLATO ANSWER
Explanation:
A reversible reaction has an equilibrium constant of 0.75. If the forward rate constant is 0.62 mol/L/s, what's the reverse reaction rate constant?
A. 0.910
B. 0.827
C. 1.010
D. 1.210
Answer: B.) 0.827
Explanation:
Given the following :
Equilibrium constant (k) = 0.75
Forward rate constant = 0.62 mol/L/s
Backward rate constant =?
The equilibrium constant denited as 'k' is the proportion of the forward rate constant and the reverse rate constant.
Mathematically,
K = [forward rate constant / Reverse rate constant]
k = 0.75 ; forward rate constant = 0. 62mol/L/s
0.75 = [ 0.62mol/L/s ÷ reverse rate constant]
Reverse rate constant * 0.75 = 0.62mol/L/s
Reverse rate constant = (0.62mol/L/s ÷ 0.75)
Reverse rate constant = 0.8266mol/L/s
Reverse rate constant = 0.827mol / L/s
Answer:
0.827
Explanation:
10) A hydrobromic acid (HBr) solution has a molar concentration of 0.0085 M. Calculate the
[H3O+], [OH-] and pH of the solution.
Answer:
Explanation:
To find the [H3O+] of the solution, we can use the fact that HBr is a strong acid and completely dissociates in water. Therefore, the concentration of H3O+ is equal to the molar concentration of HBr:
[H3O+] = 0.0085 M
To find the [OH-], we can use the equation:
Kw = [H3O+][OH-]
Where Kw is the ion product constant for water, which has a value of 1.0 x 10^-14 at 25°C.
Rearranging the equation to solve for [OH-], we get:
[OH-] = Kw / [H3O+]
[OH-] = (1.0 x 10^-14) / (0.0085)
[OH-] = 1.176 x 10^-12 M
To find the pH of the solution, we can use the equation:
pH = -log[H3O+]
pH = -log(0.0085)
pH = 2.07
Therefore, the [H3O+] of the solution is 0.0085 M, the [OH-] is 1.176 x 10^-12 M, and the pH is 2.07.
Which statement correctly describes Earth’s magnetic field?
A) A compass can lead a hiker to the geographic North Pole.
B) The magnetic pole near the South Pole is a north pole.
C) Compasses point toward a magnetic pole that is a north pole.
D) Field lines circle Earth from east to west.
Answer:
B) The magnetic pole near the South Pole is a north pole.
Explanation:
The north pole on the compass is the geographical South Pole.
Hope it helps.
Answer:
The answer is B.
Explanation:
At a certain temperature, Ke = 3 for the reaction NO3(g) NO(g) + O2(g) Find the direction of thereaction if at some point in time in a 1.0 vessel the following respective concentrations were measured; [NO] = 2.0 mol/L, [O2] = 1.0 mol/L and NO3(g) = 0.75 mol/L.
You would expect magnesium to be most similar in properties to
A. silicon.
B. calcium.
C. potassium.
D. sulfur.
Answer:
Calcium
Explanation:
"Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth. "
Answer:
Calicum
Explanation:
DID THE TEST AND GOT IT RIGHT!!!
Which element has a larger atomic radius than aluminum (AI)?
The Periodic Table
O A. Boron (B)
B. Silicon (Si)
O C. Nitrogen (N)
O D. Sodium (Na)
Answer:
The correct answer is D because i did this before and got it right.
Explanation:
One mole of any gas at room
temperature and pressure will
occupy liter(s).
A. 10
B. 1
C. 22.4
D. 24
Reset Selection
One mole of any gas at room temperature and pressure will occupy 22.4 liter(s) (option C).
What is an ideal gas?Ideal gas is an hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.
One mole of an ideal gas contains a volume of 22.414 L at standard temperature and pressure (STP).
According to Avogadro's law, the volume occupied by one mole of a gas must be the same for all gases if the temperature and pressure are the same.
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Explain the difference between the way a molecule (which does not ionize) dissolves and an ionic compound dissolves, using sugar water and salt water as an example
Answer:
The molecules (which do not ionize) dissolves in water depends on the polarity of molecules while the ionic compounds that dissolve in water depend on the electric charge of the compound.
For example sugar dissolves in water because of the polar nature of sugar which releases energy and form intermolecular bonds with the polar water molecules.
While salt dissolves in water as salt has a net electric charge that attracted by the oppositely charged ions present in the water. The attractive force between salt and water is stronger than sodium and chloride and allow salt to dissolve in the water.
Suggest why the colour of the copper sulfate solution fades during electrolysis.
Please help! Thank you:)
Answer:
The traces of hydrogen ions are not discharged, so you not see any gas bubbles collecting on the negative cathode electrode. The blue colour fades as more and more copper is deposited, depleting the concentration of the blue copper ion Cu2+ ions in solution.
Explanation:
Which of the following is a polar molecule?
O A. A carbon monoxide molecule (CO)
OB. A linear carbon dioxide molecule (CO2)
OC. A calcium oxide molecule (Cao)
O D. An oxygen molecule (0)
Answer:
D. An oxygen molecule (0)
Explanation:
Hope it helps.
Two atoms have the same relative atomic mass but different chemical properties.
Which row about the proton and neutron numbers of these atoms is correct?
Answer:
A
Explanation:
Protons are the ones which give rise to different elements, hence different elements have different chemical properties. Therefore, the two atoms must have different proton numbers.
The relative atomic mass of an atom is determined by the mass of the neutrons and the protons. The mass of the electrons are not included due to their negligible mass (1/1840).
Hence, due to the different proton masses, the masses of the neutrons will also differ to ensure that both atoms have the same relative atomic mass.