Which is more active? a. Iron or copper? ___________________
Answer:
iron
Explanation:
has more magnetic metal
Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.
What is electrochemical series?Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.
As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.
So, iron is more active.
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A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm. What is the volume of the bubble at the surface
As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
Boyle's lawBoyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question;
Initial volume; V₁ = 0.005mL = 5.0 × 10⁻⁶LInitial pressure; P₁ = 4.1atmFinal pressure; P₂ = 1.0atm Final volume; V₂ = ?We substitute our given values into the expression above to find the final volume.
P₁V₁ = P₂V₂
[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]
Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
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A 0.205 g sample of caco3 (mr = 100.1 g/mol) is added to a flask along with 7.50 ml of 2.00 m hcl. caco3(aq) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g) enough water is then added to make a 125.0 ml solution. a 10.00 ml aliquot of this solution is taken and titrated with 0.058 m naoh. naoh(aq) + hcl(aq) → h2o(l) + nacl(aq) how many ml of naoh are used?
Answer:
118MOLS
Explanation:
M1VI=M2V2
THE REST WORK OUT ( BA UNZA STUDENTS HE HE HE )
The picture above shows a frying pan. Why are frying pans usually made out of metal?
Answer: The frying pan is made up of metals like aluminium or stainless steel as these metals are good conductor of heat.
Answer:
b. they are good conductors of heat
Explanation:
study island
Which correctly describes the which correctly describes the relationship between a hydrate, water, and an anhydrous compound?
Heating an anhydrous compound forms water and a hydrate.
O Adding water to an anhydrous compound forms a hydrate.
O Combining an anhydrous compound and a hydrate produces water.
O Removing a hydrate from an anhydrous compound produces water.
Answer:
adding water to an anhydrous compound forms a hydrate.
Explanation:
The statement which correctly describes the relationship between a hydrate, water, and an anhydrous compound is adding water to an anhydrous compound forms a hydrate. The correct option is A.
What are anhydrous compounds?Anhydrous means without water, so the compounds that do not contain water are anhydrous compounds. Some examples are sodium sulfate, hydrogen fluoride, etc.
Hydrates are the compounds that contain water as the H2O molecules. These compounds lose their structure if water molecules are removed from the compound.
So, when water is added to the anhydrous molecules, it converts into hydrates. An example is sodium sulfate decahydrate.
Thus, the correct option is A. Adding water to an anhydrous compound forms a hydrate.
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I NEED THE AWNSER RIGHT NOWWWWW Four students categorized several environmental changes as short-term or long-term changes. Which chart correctly categorizes short- and long-term changes?
Based on the duration and effect of the environmental change, the correct categorization is as follows:
Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertificationWhat are environmental changes?Environmental changes refers to changes that occur in the environment either due to natural causes or by human activities.
Environmental changes can be categorized into:
short-term changes andlong-term changesShort-term changes occur over a short period of time while long-term changes occur over a long period of time.
Based on the chart, the correct categorization is as follows:
Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertificationTherefore, both long-term and short-term changes occur in the environment.
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Determine the ka of the weak acid ha whose conjugate base has kb 2. 9 × 10−8
Answer: [tex]3.45*10^{-7}[/tex]
Explanation:
we can use the equation Ka * Kb = Kw
Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]
we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]
now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]
which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]
hope this helped! ♡
The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
What is ka value?Ka value is the equilibrium constant found by the dissociation of acid.
By the equation
[tex]\rm ka \times kb = kw[/tex]
where kb = [tex]2.9 \times 10^-^8[/tex]
kw = [tex]1 \times 10^-^4[/tex]
Now, putting the values in the equation
[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]
Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
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How to know if a single replacement reaction will occur
Answer:
To determine whether a given single replacement will occur, you must use an “Activity Series” table. If the metal or the halogen is above the element it will replace based on the activity series, a single displacement reaction will occur. The video below summarizes an experiment conducted to compare the activities of three metals ( Mg, Cu and Zn ).
Explanation:
Single replacement reaction will occur if any more active specie will add on the solution.
What is single displacement reaction?Single displacement reactions are those reactions in which one element from the given molecule is displaced by some other element.
Generally displacement reactions are shown by metals when more reactive metal is added in the solution of any another metal. Then more reactive metal displaces the metal which is already present in the solution and reaction is taking place is shown by changing in color.
Hence single displacement reaction will occur when more reactive metal is added in any solution.
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What volume of a 0. 120 m cai2 solution would contain 0. 078 mol of the solute?.
Answer:650 mL
Explanation:
Remember that Molarity = mol/L. Rearranging the equation to solve for liters you get L = mol/Molarity.
80x10-3 mol / 12x10-2 M = 6.5x10-1 L
6.5x10-1 L (1x103) = 6.5x10 2 mL = 650mL
All materials are made of _____________.
A. Insulators
B. Atoms
C. Stuff
D. Conductors
Answer:
b atoms
Explanation:
everything is made up of atoms
6. What is the mass of the object if the net force acting on it was 356 N and the acceleration rate
was 4 m/s/s2
The mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.
How to calculate mass?The mass of an object can be calculated using the following formula:
F = ma
Where;
F = force (N)m = mass (kg)a = acceleration (m/s²)m = F/a
m = 356/4
m = 89kg
Therefore, the mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.
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A 6.0-mol sample of KClO3 was decomposed according to the equation 2KClO3 --> 2KCl + 3O2. How many moles of O2 are formed?
9.0 mol
2.5 mol
6.0 mol
4.5 mol
Answer:
2.5 mol is the answer
Explanation:
hope it will help you..
9 moles of O2
Balanced equation: 2KClO3 --> 2KCl + 3O2given:
6.0-mol of KClO3
using molar ratio:
2KClO3 : 3O2
2 : 3
moles of O₂ = ( 6/2 ) * 3 = 9 moles
Can you store cuso4 in an aluminum container? explain your reasoning
We can store the copper sulphate solution in alumiun container, if cover on alumiun is present.
Can you store cuso4 in an aluminum container?Aluminium is more reactive than copper so the Aluminium will displace copper sulphate from its solution by reacting with it but if there is cover on the aluminium then the alumium can't react with copper.
So we can store the copper sulphate solution in alumiun container.
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No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
Why do different chemicals require different containers?Different chemicals are put in different containers, usually glass, plastic, dark container, or light container.
Chemicals element are reactive to different substances and to each other.
That's why they are put in separate and different types of containers according to their reactivity.
Thus, No, we cannot store CuSO₄ in an aluminum container because aluminum will displace the copper present in the solution.
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Hello people ~
Which of the following fibres is used for making parachutes?
A. Plastic
B. Terelyne
C. Nylon
D. Taylor swift
Answer:
C. Nylon
Explanation:
Nylon is a synthetic fiber, strong, elastic, and holds excellent abrasion resistance. Therefore it is used for making parachutes and ropes for rock climbing.
Answer:
Nylon
Explanation:
Nylon is a synthetic fibre not natural so long lastingIt is highly elastic and strong material.It is water proof also so used for making parachutesPart 1. determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. show your work.
part 2. if this sample was placed under extreme pressure, describe how the actual volume would compare to the predicted volume. explain your answer.
The molar mass of a substance can be calculated by first calculating the number of moles using ideal gas law equation:
PV = nRT
Where;
P = pressureV = volumeT = temperatureR = gas law constantn = no of moles0.98 × 1.2 = n × 0.0821 × 287
1.18 = 23.56n
n = 1.18/23.56
n = 0.05moles
mole = mass/molar mass
0.05 = 0.458/mm
molar mass = 0.458/0.05
molar mass = 9.15g/mol
Therefore, the molar mass of 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm is 9.15g/molIf this sample was placed under extreme pressure, the volume of the sample will decrease.Learn more about gas law at: https://brainly.com/question/12667831
The pH of a 0.016-M aqueous solution of p-toluidine
(CH3C6H4NH2) is 8.60. Calculate Kb.
From the calculations performed, the Kb of the reaction is 9.9 * 10^-10
What is Kb?
The term Kb refers to the base dissociation constant of a solution. We have the following information from the question;
pH of the solution = 8.60
concentration of p-toluidine = 0.016-M
Recall that pOH = 14 - pH
pOH = 14 - 8.60 = 5.4
[OH] = Antilog (-5.4) = 3.98 * 10^-6 M
We have to set up the ICE table;
CH3C6H4NH2(aq) + H2O(l) ⇄ CH3C6H4NH3^+(aq) + OH^-(aq)
I 0.016 0 0
C -x +x +x
E 0.016 - x 3.98 * 10^-6 3.98 * 10^-6
Hence;
Kb = [3.98 * 10^-6]^2/[0.016 - 3.98 * 10^-6]
Kb = 9.9 * 10^-10
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A monosaccharide is formed from a polysaccharide in what kind of reaction?.
Answer:
Catabolic reactions
Explanation:
Anabolic reactions combine monosaccharides to form polysaccharides, fatty acids to form triglycerides, amino acids to form proteins, and nucleotides to form nucleic acids. These processes require energy in the form of ATP molecules generated by catabolic reactions.
The ph of a solution is 2. 0. Which statement is correct? useful formulas include startbracket upper h subscript 3 upper o superscript plus endbracket equals 10 superscript negative p h. , startbracket upper o upper h superscript minus endbracket equals 10 superscript negative p o h. , p h plus p o h equals 14. , and startbracket upper h subscript 3 upper o superscript plus endbracket startbracket upper o upper h superscript minus endbracket equals 10 to the negative 14 power. The poh of the solution is 12. 0. The concentration of oh– ions is 1. 0 mc021-5. Jpg 10–2 m. The concentration of upper h subscript 3 upper o superscript plus. Ions is 100. 0 m. The poh of the solution is 16. 0.
If the pH of the solution is 2.00. it follows that the pOH of the solution is 12.
What is pH?The term pH refers to the hydrogen ion concentration of the solution. It shows the degree of acidity in the solution. We also know that the pOH can be obtained from the pH using; pOH = 14-pH.
Hence, if the pH of the solution is 2.00. it follows that the pOH of the solution is 12.
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Which of the following is not manufactured from high-density polythene?
A. Containers
B. Pipes
C. Candles
D. Toys
Hey there!
C. Candle
Explanation:
Answer. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. and not used for the production of candles. Commercially available candles are made with paraffin wax.
What two countries have nearly 50% of global coal reserves? a. united states and canada b. united states and russia c. brazil and russia d. brazil and canada please select the best answer from the choices provided a b c d
Answer:
B
Explanation:
The two countries that have nearly 50% of global coal reserves are
United States and Russia
Option B is correct
What is the global coal reserves?
Estimates of total world proved recoverable coal reserves as were around 1,156 billion short tons, with five countries accounting for roughly 75% of the world's proven coal reserves.
In conclusion, The USA coal reserves amounted to nearly 248.9 billion metric tons in 2020
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Which of the following is pure compound?
Ethanol,petrol,steel ,tapwater
Answer:
tap water Is the pure substance
Answer:
Ethanol is pure
Explanation:
Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure
A gas mixture contains the following gases with the mole fractions indicated:
water (0.164), hydrogen (0.278), oxygen (0.455), and carbon dioxide (0.101). The
mixture also contains carbon monoxide. What is the mole fraction of carbon
monoxide? PLEASE HELP!
Hi there!
To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.
We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.
1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002
Eas: add two curved arrows to show how water acts as a base
You are a NASA engineer. You are the chief engineer for the Apollo 13 mission to the moon. The astronauts are running out of oxygen and need to get rid of the excess carbon dioxide. You know that sodium hydroxide (NaOH) has been suggested as a means of removing carbon dioxide from the spacecraft cabin. The filter which they had been using is fully saturated and no longer works. You remember that the astronauts have a 5000. g container of sodium hydroxide on the ship. You also know that sodium hydroxide can be used to remove carbon dioxide.
Use the following reaction: NaOH + CO2 → Na2CO3 + H2O
The astronauts have 2 days left before they land on Earth. You know that there are three astronauts, and each astronaut emits roughly 500. g Of carbon dioxide each day. Is there enough sodium hydroxide in the cabin to cleanse the cabin air of the carbon dioxide, or are the astronauts doomed?
Given the data from the question, the astronauts do not have enough sodium hydroxide in the cabin to cleanse the cabin air of the carbon dioxide.
How to determine the total CO₂CO₂ emitted per astronaut per day = 500 gCO₂ for 3 astronaut per day = 3 × 500 = 1500 gCO₂ for 3 astronaut for 2 days = 2 × 1500 = 3000 gBalanced equation
2NaOH + CO₂ —>Na₂CO₃ + H₂O
Molar mass of NaOH = 40 g/mol
Mass of NaOH from the balanced equation = 2 × 40 = 80 g
Molar mass of CO₂ = 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY
From the balanced equation above,
44 g of CO₂ required 80 g of NaOH
How to determine the mass of NaOH neededFrom the balanced equation above,
44 g of CO₂ required 80 g of NaOH
Therefore,
3000 g of CO₂ will require = (3000 × 80) / 44 = 5454.55 g of NaOH
From the calculation made above, we can see that 5454.55 g of NaOH is needed by the astronaut to clean the cabin air but unfortunately, they only have 5000 g of NaOH.
Thus, we can conclude that the astronauts do not have enough NaOH to clean the air
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What are the examples of 8 branches of chemistry?
Answer:
hmm suspicious
lol I don't know bye
How does learning about elements,compounds and i turns allow us to understand the matter around us
Answer:
shows how anything like each thing is composed of for instance see how water is made of: hydrogen and oxygen which makes it a compound
The elements are the basic things by which everything in the world is build up. Different elements combine to form compounds. There are various kinds of inorganic and organic compounds around us that create the matter.
What are elements ?Elements are the basic things of any substance in the world. There are 118 known elements which can be found in the modern periodic table. These elements include metals, gases, and semi metals.
Atoms of same elements forms molecules. Atoms of different elements combines to form the compounds. There are various types of compounds such as ionic compounds, covalent compounds, coordination complex etc.
Water is a compound formed from the elements hydrogen and oxygen. The table salt we use every day is a compound, sodium chloride. Similarly we can find there are many compounds that we use everyday are creating the matter in the world.
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SCIENCE- The Periodic Table of elements
help help
Answer:
hydrogen is the first in periodic table
A bicycle tire has a volume of 1.0 l at 22°c. if the temperature of the tire is increased to 52°c, what is the resulting volume of the tire? type in your answer using the correct number of significant figures. use the formula for charles' law: v1 t1 = v2 t2 l
The relationship between the volume, temperature, and pressure of the gas can be given by Charles law. The volume of the tire is 1.1 L.
What is Charle's law?According to Charles's law, the volume is directly proportional to the temperature of the gas at a constant pressure.
Charle's law can be shown as,
[tex]\rm \dfrac{V_{1}}{T_{1}} = \rm \dfrac{V_{2}}{T_{2}}[/tex]
Given,
Initial volume = 1.0 L
Initial temperature = 295 K
Final volume = ?
Final temperature = 325 K
Substituting values in the above equation the final volume can be calculated as:
[tex]\begin{aligned}\rm V_{2} &= \rm \dfrac{V_{1}T_{2}}{T_{1}}\\\\&= \dfrac{ 1 \times 325}{295}\\\\&= 1.1\;\rm L\end{aligned}[/tex]
Therefore, the final resulting volume of the tire is 1.1 L.
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Answer:
1.1 LExplanation:
What is the percent by mass of a solution containing 4. 0g of solute in 100g of water? (Percent by mass formula: (mass of solute/mass of solution) x 100) A 40 % B. 3. 8 % 26 % D. 2. 1 %
Use Figure 2 to describe which type of microscope the scientists should use to study the features of the hairlike organelles. Explain one possible function for these organelles based on where the organelles are located in the cell model in Figure 1
The Figure is not found here but the tiny hairlike organelles are also referred to as cilia.
What are cilia?Cilia are a special type of hairlike organelles capable of covering the surface of cells in many different organisms.
Cilia are found in different eukaryotic organisms ranging from unicellular protists to mammals (epithelial tissues).
The function of cilia is to produce motion (movement) of the cell in which these structures are found.
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