This problem is providing us with the mass equivalent to one troy ounce. Thus, the troy ounces of gold in one short ton of average Nevada ore is required and found to be the 0.103 otz according to the following dimensional analysis.
Dimensional analysisIn chemistry, a raft of problems do not always provide an equation in order to be solved yet dimensional analysis can be applied, so as to obtain the desired amount in the required units.
Thus, since this problem asks for try ounces in an average Nevada ore, which has 3.2 grams of gold per short ton of ore, one can solve the following setup in order to obtain the required answer in otz:
[tex]\frac{3.2gAu}{1short-ton}*1short-ton*\frac{1otz}{31.1g} \\[/tex]
Where the short tons are cancelled out as well as the grams, in order to obtain:
[tex]0.103 otz[/tex]
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Identify whether the following changes would increase or decrease the rate constant. (1 point)
Increasing Ea (0.5 point):
Increasing T (0.5 point):
Answer:
Increase
Increase
Explanation:
By increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.
What is Rate Constant ?
The rate constant is also known as specific rate constant is a proportionality factor between rate of reaction and concentration.
Arrhenius Equation[tex]k = Ae^{-\frac{Ea}{RT}}[/tex]
Where,
k = Chemical reaction rate
A = Pre-exponential Factor
Ea = Activation energy
R = Gas constant
T = Temperature
Now, check whether the following change increases or decreases the rate constant.
Increasing Ea
According to the Arrhenius Equation the higher the activation energy, the slower the reaction. Rate constant increases exponentially with decreasing Ea and increasing T. So by increasing activation energy (Ea) decreases the rate.
Increasing T
The rate constant increases with increase in temperature. increasing the T of a reaction increases the rate because the rate constant increases a/q to the Arrhenius Equation. So by increasing the temperature increases the rate.
Thus, we can conclude that by increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.
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The Haber-Bosch process operates at reaction pressures of 200.0
atm and higher. What is this pressure in psi?
How many oxygen atoms are in 4.00g of quartz?
Answer:
Rounding for significant figures gives us a final answer of 3.41×1022 atoms 3.41 × 10 22 a t o m s atoms of oxygen.
The oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.
What are atoms?Atoms are defined as a smallest unit into which matter can be divided without the release of electrically charged particles.
It can also be defined as a building block of matter and were created after big bang theory.
The amount of mole of SiO₂ in 4.00 grams
= 4.00 / 60 = 0.07 moles
As 2 atoms of oxygen atoms are present in quartz formula, the number of mole of O₂ in this formula
= 2 x 0.07 = 0.14 mole
So, the amount of O₂ in 4.00 g of quartz
= 6.02 x 10²³ x 0.14
= 8.4 x 10²² atoms of oxygen.
Thus, the oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.
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What is the relationship between organic and DNA and RNA Explain?
Answer:
The two main types of nucleic acids are DNA and RNA. Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base. DNA provides the code for the cell's activities, while RNA converts that code into proteins to carry out cellular functions.
Explanation:
How many kilometers are there in 3.4 miles
Answer: 5.47177
For every Mile there is 1.60934 Kilometers
so we take 3.4 and multiply it by 1.60934
3.4 x 1.60934
= 5.47177 Km
Draw the orbital diagrams of the valence orbitals of tantalum when it bonds with the following ligands. Indicate clearly how each ligand brings electrons into the metal orbitals. ( 8 Marks) (a) Three chloride ions (b) A singlet carbene (c) A triplet carbene (d) Ethene
Orbital diagrams are diagrammatic representations of the arrangement of electrons in an atom.
What are orbital diagrams?Orbital diagrams are diagrammatic representations of the arrangement of electrons in an atom. The element Tantalum is a transition element of the third row.
1) When three chloride ions attach to Ta^2+, the three 5d orbitals are involved.
2) When Ta^2+ bonds to a singlet carbene, the 6s orbital is used.
3)When Ta^2+ is bonded to a triplet carbene, the outer 6p orbitals
4) When Ta^2+ is bonded to ethene the outer 6p orbitals.
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Which of the following is a polyatomic ion?
A.) Chloride, Cl−
B.) Nitrate, NO3 −
C.) Carbon dioxide, CO2
D.) Iron(III), Fe3+
What is observed in aqueous mixture of zinc chloride and silver nitrate
What can be separated by filtration
Answer:
Filtration is the process of separating solids from liquids using filter paper. The process can be used to separate an insoluble solid, for example, stone or sand grains from a liquid. The liquid could be a pure liquid, for example, water, or it could be a solution, for example, salty water.
Explanation:
Answer:
solids for liquids
Explanation:
The process can be used to separate an insoluble solid, for example stone or sand grains from a liquid.
100 points+Brainliest for correct answer
An electron on an energy level has an energy of 16.32 x 10−19 J. It moves to another level by releasing 5.4 x 10−19 J of energy. Which of the following descriptions mostly likely explains what occurred?
The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
O Option 1
Explanation:
IF ENERGY IS RELEASED, THEN ENERGY RELEASED SHOULD BE SUBTRACTED FROM ORIGINAL.
(16.32 X 10^-19) - (5.4 X 10^-19)
10.92 X 10^-19
Explain the properties of metals by completing the following sentences, The of transition metals ncreases as the number of delocalized electrons Because the in metals are strongly attracted to the delocalized electrons in the metal, they are not easily from the metal causing the metal to be very Alkali metals are than transition metals because they have only per atom The of metals vary greatly. The melting points are not as extreme as the It does not take an extreme amount of energy for to be able to move past each other. However, during atoms must be separated from a group of which requires a lot of Copyright McGraw-Hill Education Light absorbed and released by the in a metal accounts for the of the metal,
The high melting and boiling point of metals is due to the attraction between the delocalized electrons and the positive ions in metallic bonding.
What are metals?Metals are mostly hards and shiny solid elements which forms ions by loss of electrons.
Metals are found in group 1, 2 and 3 of the periodic table of elements.
Transition metals are found in the d- and f-block of the periodic table.
The melting and boiling point of transition metals increases as the number of delocalized electrons increases.
Because the positive ions in metals are strongly attracted to the delocalized electrons in the metal, they are not easily removed from the metal causing the metal to be very hard, malleable and ductile.
Alkali metals are more reactive than transition metals because they have only one valence electron per atom
The boiling points of metals vary greatly.
The melting points are not as extreme as the boiling point. It does not take an extreme amount of energy for atoms to be able to move past each other. However, during boiling, atoms must be separated from a group of which requires a lot of energy.
Light absorbed and released by the electrons in a metal accounts for the luster of the metal.
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What is an enzyme and how does it affect a chemical reaction?
Answer:
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
Answer: Enzymes are catalysts which will lower the activation energy of a chemical reaction. Activation energy is the energy needed to get a reaction going. By lowering the amount of energy needed to start a reaction, the reaction can go more quickly.
40
0 JO %
20
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0
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25
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Time (Days)
You start with a 500 g sample of Co-57. About how much time has passed if you end up with a 250 g sample?
A
10 days
B
20 days
30 day
Loy
Answer:
what you've asked so I guess the answer will be 10 days
Based on the table above, oil would transfer heat the best because its specific heat is the
Answer:
Based on the table above, sesame oil would transfer heat the best because its specific heat is the lowest.
Explanation:
Edge 2022
It is almost time to explain to the people of Westfield how the rust in their water formed. What have
you learned so far about how new substances form?
Explanation:
its asking how will you explain to the people on what made the water rust? what have you learned about how water rust in your class? just explain it what you already know!!
The liquid and solid state exist because of:
Answer: Its B
Explanation:
A scientist studies the bond energies of different compounds containing nitrogen (N). The scientist observes that the N–N bonds in one group of compounds have a bond energy of 209 kJ/mol, while the N–N bonds in another group of compounds have a bond energy of 418 kJ/mol. In one or two sentences, postulate a reason for this difference
The first case has N-N single bond has the second case has N-N double bond.
What is bond energy?The term bond energy is referred to as the energy that is released when a bond is formed it is equal to the energy that is required to break the bond.
In the first case, the N-N bond has an energy of about 209 kJ/mol indicating that it must be a single bond. The second case has a bond energy of 418 kJ/mol indicating that it is an N-N double bond.
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Answer:
Explanation:
The difference in bond energies of N–N bonds in different compounds could be due to the presence of different chemical groups around the nitrogen atoms. These chemical groups can influence the bond strength between the nitrogen atoms, causing the bond energy to vary. Additionally, different bonding arrangements, such as single or double bonds, could also contribute to the difference in bond energy.
Look at the diagram below , which shows gas particles in a container. If the piston was lowered, so that the size of the container decreases, what would happen to the pressure? Explain your reasoning. In your explanation, include which gas law (Boyle's law, Charles' law, or Gay-Lussac's law) this involves.
The pressure of the gas is expected to increase in accordance to Boyle's law.
What is Boyle's law?Boyle's law states that, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature.
By implication, when the piston is lowered and the volume of the gas is decreased, the pressure of the gas is expected to increase in accordance to Boyle's law.
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A sample of the alloy “electrum” is 62% silver and 38% gold by mass; mass of part/
mass total× 100%. What is the ratio of the number of silver to gold atoms?
Answer:
c
Explanation:
edge 2022
4. Circle the element with the greatest atomic radius. [4]
C.
a.
sodium or magnesium
b. magnesium or beryllium
lithium or rubidium
d. cesium or radon
oxygen or fluorine
f. phosphorus or aluminum
g. calcium or barium
h. boron or gallium
e.
The atomic greatest radius is magnisium
100 points+Brainliest for correct answer
An electron on an energy level has an energy of 16.32 x 10−19 J. It moves to another level by releasing 5.4 x 10−19 J of energy. Which of the following descriptions mostly likely explains what occurred?
The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
j=my 21.67-2x
Explanation:
under stand please mark me the brainliest
In an experiment, you measure a solution absorbance of 0.2 with a path length of 1cm. If the molar absorptivity coefficient is 59 cm-1 M-1, what is the concentration in Molarity?
A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.
What does Beer-Lambert law state?The Beer-Lambert law states that for a given material sample, path length and concentration of the sample are directly proportional to the absorbance of the light.
A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, we can calculate the molarity of the solution using the following expression.
A = ε × b × c
c = A / ε × b
c = 0.2 / (59 cm⁻¹ M⁻¹) × 1 cm = 0.003 M
where,
A is the absorbance.ε is the path length.b is the molar absorptivity coefficient.c is the molar concentration.A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.
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What is the definition of a reducing agent?
Answer:
a substance that tends to bring about reduction by being oxidized and losing electrons.
Answer:
a substance that reduces a chemical compound usually by donating electrons.
Na2CO3+Ca(NO3)2⟶CaCO3+2NaNO3 what mass of calcium nitrate in grams is needed to produce 4.93 mol of sodium nitrate?
Answer:
404.47692 g
Explanation:
Na₂CO₃ + Ca(NO₃)₂ ⇒ CaCO₃ + 2NaNO₃
From the coefficients in the balanced chemical equation, we see that the ratio of Ca(NO₃)₂ and 2NaNO₃ is 1:2, so every 1 mol of Ca(NO₃)₂ produces 2 mols of 2NaNO₃.
(4.93 mol NaNO₃)([tex]\frac{Ca(NO3)2}{2NaNO3}[/tex]) = 2.465 mol Ca(NO₃)₂
Then, we need to convert from moles to grams, since we are asked to find the mass of Ca(NO₃)₂. To do this, we need to look up the molar mass of Ca(NO₃)₂, which is 164.088 g/mol.
(2.465 mol Ca(NO₃)₂ ) ( [tex]\frac{164.088 g}{1 mol}[/tex]) = 404.47692 g
Thus, 404.47692 grams of Ca(NO₃)₂ is needed to produce 4.93 mol of 2NaNO₃.
The reaction between ammonia and nitrous oxide is given below:
[tex]2NH3(g) + 3N2O(g)→ 4N2(g) + 3H2O(g)[/tex]
We therefore know that which of the following reactions can also occur?
AnswerAnswer:
Explanation:The Answer is Option A
Which of these compounds would you expect
to contain covalent bonds? Why?
a. KCI
b. PBr3
c. CIBr
d. Nal
What was the chemical purpose of heating the MnSO4⋅H2O? Why is this procedure important?
The chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.
Dehydration reactionsDehydration reaction is a type of chemical reaction that involves the removal of water which would eventually lead to the formation of a new compound.
The molecule of MnSO4⋅H2O contains a molecule of water(H2O). After heating of the molecule, water is lost giving rise to the dry compound MnSO4.
Other examples of dehydration reactions are:
Reactions that produce acid anhydrides.Reactions that involve the production of polymers.Reaction of sucrose with concentrated sulfuric acidTherefore, the chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.
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If you have a room that is 14 feet wide, 20.5 feet long, with 10 foot ceilings. What is the total
square foot area?
Answer:
i got 6
Explanation:
Because 14 feet divide by 20.5 gives you 0.6
so it 0.6 times 10 =6
Answer:
140 square feet
Explanation:
Given the following question:
Room is 14 feet wide = the width
20.5 feet long = the length
10-foot ceilings = the height
Area = Width × Height
[tex]A=10\times14=140[/tex]
[tex]A=140 ft^2[/tex]
The area of the room is "140 square feet."
Hope this helps.
Do you think aerodynamics is MORE important or LESS important in CO2 cars compared to regular pinewood derby cars?
Answer:
more
Explanation:
bc it makes science so I hope you get it tight.
Find mass percent of each element URGENT PLS HELP!!!
Answer: Think and you will get it right!
Explanation:
To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.