Answer:
All of these are true.
Explanation:
Copper lies below iron in the activity series, this implies that copper is more easily reduced than iron as its electrode potential is positive.
Also, copper is extracted easily from its sulphide ore by oxidation with oxygen. Similarly, the reduction of iron in a blast furnace requires toxic CO, hence the answer above.
What makes up nearly all of the atom's mass?
A. The sum of all protons and neutrons
B. The sum of all neutrons and electrons
C. The sum of all protons and electrons
D. The sum of all isotopes
SUBMIT
Answer:
a. the sum of all protons and neutrons
What mainly inspired the Europeans to travel the ocean
1)colonization
2)trade
3)spread christianity
4)slavery
A high concentration of hydrogen ions means a solution is what? very basic neutral very acidic neither acidic or basic
Answer:
Very Acidic
Explanation:
I took the quiz on K12
What volume of solution is prepared when 25.0 g of ethanol (C2H5OH) is added to enough water to make a 0.750 M ethanol solution?
Answer:
0.724 L
Explanation:
Step 1: Given data
Mass of ethanol (solute): 25.0 g
Concentration of the solution: 0.750 M
Step 2: Calculate the moles corresponding to 25.0 g of ethanol
The molar mass of ethanol is 46.07 g/mol.
25.0 g × (1 mol/46.07 g) = 0.543 mol
Step 3: Calculate the volume of the solution
We will use the following expression.
M = moles of solute / liters of solution
liters of solution = moles of solute / M
liters of solution = 0.543 mol / (0.750 mol/L)
liters of solution = 0.724 L
What is the mass of 5.80x10^23 atoms of silver
Answer:
5.80000000E+ 46...follow me and mark me brainliest
Most people use the _____ for intercity travel
Answer:
The person at the top said the right answer I checked
what is The pH and pOH of a 1.00x10-3M solution of CH3COOH (Ka=1.75x10-5) ?
Answer:
pH = 3.9pOH = 10.1Explanation:
Since [tex]CH _ 3COOH[/tex] is a weak acid to find the pH of [tex]CH _ 3COOH[/tex] we use the formula
[tex]pH = - \frac{1}{2} log(Ka) - \frac{1}{2} log(c) [/tex]
where
Ka is the acid dissociation constant
c is the concentration
From the question
Ka of [tex]CH _ 3COOH[/tex] = 1.75 × 10^-5
c = 1.00 × 10-³M
Substitute the values into the above formula and solve for the pH
That's
[tex]pH = \frac{1}{2} ( - log(1.75 \times {10 }^{ - 5} - log(1.00 \times {10}^{ - 3} ) ) \\ = \frac{1}{2} (4.757 + 3) \\ = \frac{1}{2} \times 7.757) \\ = 3.8785 \: \: \: \: \: \: \: \: [/tex]
We have the answer as
pH = 3.9To find the pOH we use the formula
pH + pOH = 14
pOH = 14 - pH
pOH = 14 - 3.9
We have the answer as
pOH = 10.1Hope this helps you
A certain compound contains 4.0 g of calcium and 7.1 g of chlorine. Its relative molecular mass is 111. Find its empirical and molecular formulas
Given :
A certain compound contains 4.0 g of calcium and 7.1 g of chlorine.
Its relative molecular mass is 111.
To Find :
Its empirical and molecular formulas.
Solution :
Moles of calcium , [tex]n_1=\dfrac{4}{40}=0.1\ moles[/tex].
Moles of chlorine , [tex]n_2=\dfrac{7.1}{35.45}=0.2\ moles[/tex] .
The ratio calcium and chlorine is 1 : 2 .
So , the empirical formula is [tex]CaCl_2[/tex] .
Now , molecular mass of [tex]CaCl_2[/tex] is :
[tex]M=40+(2\times 35.45)\\\\M=110.9\ g[/tex]
So , [tex]n=\dfrac{111}{110.9} \approx1[/tex]
Therefore , the molecular formula is also [tex]CaCl_2[/tex] .
Hence , this is the required solution .
The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density methyl acetate dimethyl sulfoxide glycerol acetone ethanolamine Next, the chemist measures the volume of the unknown liquid as 1698 and the mass of the unknown liquid as . Calculate the density of the liquid. Round your answer to significant digits. Given the data above, is it possible to identify the liquid? yes no If it is possible to identify the liquid, do so.
Answer:
a) Density of unknown liquid = 0.934 g/cm³
b) Yes
c) The unknown liquid is methyl acetate
Note: The question is missing some parts; the densities of the liquids from the material data sheet. A similar question is given below:
A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of acetone, chloroform, methyl acetate, glycerol, and ethanolamine.
The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: (the attachment below shows a table of the Material Safety Data Sheet)
Explanation:
Part 1
Density = mass/volume
Mass of unknown liquid = 512.0 g
Volume of unknown liquid = 0.548 L = 548 cm³ (Note: 1 L = 1000 cm³)
Density = 512.0 g/548 cm³ = 0.934 gcm³l to 3 significant figures.
Part 2
Yes, it is possible to identify the liquid from the value of its calculated density when compared with that of the known liquids in the Materials and Safety Data Sheet.
Part 3
The unknown liquid is methyl acetate since the density of the unknown liquid matches its density.
is Crystallizing sodium Acetate a physical or chemical change
Answer: physical please let me know if its wrong !
Draw the structure of aspirin acid and conjugate base.
Answer:
Aspirin = acetylsalicyclic acid
Its conjugate base = acetylsalicyclate
Note: See the attachment below for structures.
Explanation:
Aspirin, also known as acetylsalicyclic acid is derived from the acetylation of salicyclic acid at carbon-2. It is used as a medication in the treatment of pain, fever and inflammation.
It is grouped under the class of non-steroidal anti-inflammatory drugs (NSAIDs), which are a class of drugs that in addition to anti-inflammatory actions, have analgesic, antipyretic, and platelet-inhibitory actions.
Its conjugate base, acetylsalicyclate is obtained from the deprotonation of the carboxylic acid group, -COOH.
The only metal that exists as a liquid at room temperature is
Answer:
Mercury
Explanation:
This is the only metal that exists as a liquid at room temperature
If you start a chemical reaction with 38 grams of reactants, how many grams of a product would
you end up with?
Your answer:
Answer:
38 g as well due to the law of conservation of mass.
Explanation:
Hello,
In this case, we need to review the law of conservation of mass which states that matter cannot be neither created nor destroyed, thus, for chemical reactions, the mass of reactants at the beginning of the chemical reaction must equal the mass of products at the end in closed systems, that is why, since 38 g is the mass of reactants, the mass of the overall products is also 38 g.
Best regards.
What is a relief in relation to topography ?
Answer:
Relief is typically defined as the difference in height between the high point and the low point on a landscape, in feet or in meters.
Explanation:
Answer:
Relief is the difference in elevation between two points. It is easily calculated by subtracting the lowest elevation from the highest elevation in an area.
Explanation:
Mark me brainly please(:
Which one of the following combinations cannot function as a buffer solution?
A) HCN and KCN
B) NH3 and (NH4)2SO4
C) HNO3 and NaNO3
D) HF and NAF
E) HNO2 and NaNO2
Answer:
it is B
; )
Which one of the following combinations cannot function as a buffer solution?
A) HCN and KCN
B) NH3 and (NH4)2SO4
C) HNO3 and NaNO3
D) HF and NAF
E) HNO2 and NaNO2
Which Of The Following Monosaccharides Is Not An Aldose? A) Crythrose B) Fructose C) Glucose D) Glyceraldehyde E) Iribose
Fructose monosaccharides is not an aldose sugar. Hence option B is correct.
What is Monosaccharide?Monosaccharide is a simplest form of sugar that is not decompose in simple sugars by hydrolysis and it contains one or more hydroxyl groups.
Types of sugars – Aldose and ketose (which are named on the basis of presence of functional groups aldehyde and ketone).
Aldose is a monosaccharide contains carbon chain with carbonyl group in endmost carbon atom.
Erythrose, glucose, glyceraldehyde and ribose contain aldehyde as a functional group so these are example of aldose where as fructose contains a ketone group so it is a ketose not an aldose.
Fructose monosaccharides is not an aldose sugar. Hence option B is correct.
Learn more about Monosaccharide, here:
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Convert 9541mg to kg
Answer: 9.541 kg
Explanation:
Answer:
i believe it is 0.009541
What is the difference between an element and a compound?
A. An element is a pure substance, a compound is a mixture.
B. An element is more than one type of atom, a compound is a single type of atom.
C. An element is one type of atom, a compound is more than one type in mixed composition.
D. An element is one type of atom, a compound is more than one type bonded together.
Based upon the structures of acetylsalicylic acid, acetaminophen, and caffeine, including their functional groups and overall polarity, which best explains why ethanol is likely responsible for the fact that ASA and APHEN elute first in this solvent?
Answerb
Explanation:because I got it right
Compare the components that make up the windsurfer, his board, and his surroundings.
Answer:
The windsurfer, his board, and the air and water around him are all made of matter. That matter is made up of very small particles called atoms.
Explanation:
The windsurfer, the board, and the surroundings are all components involved in the activity of windsurfing. Let's compare them:
1. Windsurfer: The windsurfer is the person engaging in the sport. They are responsible for controlling the board and maneuvering through the water using the sail. The windsurfer's skills, balance, and physical abilities play a crucial role in their performance.
2. Board: The windsurfing board is the equipment used by the windsurfer. It typically consists of a long, narrow board with a fin at the bottom for stability and control. The board is designed to float on the water and provide a platform for the windsurfer to stand on.
3. Surroundings: The surroundings refer to the environment in which windsurfing takes place, which is usually a body of water such as a lake, river, or ocean. The condition of the water, including its temperature, depth, and currents, can affect the windsurfer's experience and performance.
In summary, the windsurfer, the board, and the surroundings are interconnected components of the windsurfing experience.
The skills and physical abilities of the windsurfer, the design and performance of the board, and the characteristics of the surrounding environment all contribute to the overall enjoyment and success of the activity.
Know more about windsurfing:
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What is the purpose of Oxidation?
why are there so many ads
in physics matter has three fundamental states gas solid and???
Liquid (Matter can exist in one of three main states: solid, liquid, or gas.)
Calculate the net force that thymine exerts on adenine. To keep the calculations fairly simple, yet reasonable, consider only the forces due to the O−H−N O − H − N and the N−H−N N − H − N combinations, assuming that these two combinations are parallel to each other. Remember, however, that in the O−H−N O − H − N set, the O− O − exerts a force on both the H+ H + and the N− N − , and likewise along the N−H−N N − H − N set.
Answer:
hello your question is incomplete and lacks the required figure below is the missing part
The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine shows the thymine adenine bond. Each charge shown is ±e, and the H−N distance is 0.110 nm
answer : net force due to O-H-N combination = -5.03354 * 10^-9 N
net force due to N-H-N combination = -3.822 * 10^-9 N
net force that the thymine exerts on adenine = -8.8558 * 10^-9 N
Explanation:
considering only the forces due to O-H-N and N-H-N to determine the net force been exerted on adenine by thymine
we have to make some assumptions
we have to assume force towards thymine to be negative
Net force that thymine exerts on Adenine
= net force due to 0-H-N + net force due to N-H-N
= ( -5.03354 * 10^-9 ) + ( - 3.822 * 10 ^-9 )
= -8.8558 * 10 ^-9 N
ATTACHED BELOW IS THE REMAINING PART OF THE SOLUTION
True or False:
Because the length, width and height of a cube are both
extensive properties, the volume of the cube is also an
extensive property.
Answer:
true
Explanation:
Skepticism _____. means not having an open mind is the belief that knowledge is not certain is a quality scientists should not have keeps scientists from making new discoveries
Answer:
(C) is the belief that knowledge is not certain.
Explanation: I would say it’s (C) because Most scientist or empirical skeptic is one who questions beliefs on the basis of scientific understanding and empirical evidence. Scientific skepticism may discard beliefs pertaining to purported phenomena not subject to reliable observation and thus not systematic or testable empirically.
Answer:
(C) is the belief that knowledge is not certain.
Explanation:
if you add sugar to water and the sugar no longer dissolves and it settles at the bottom the solution has become
Answer:
It forms a solution.
Explanation:
A pure substance is when only one type of atom or molecule is present. In this case the substance contains two different molecules; sugar and water, assuming sugar is all one type (e.g. glucose) and there are no contaminants in the water or sugar before combining the two.
Dissolving the sugar in the water makes a homogeneous mixture and once dissolved a solution is made by the combination of a solute (sugar) and solvent (water).
Hope this helps!!!!
A 3.31-g sample of lead nitrate, Pb(NO3)2, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 2.53 L. The salt decomposes when heated, according to the equation:
2Pb(NO3)2(s)-->2PbO(s) + 4NO2(g) + O2(g)
Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300. K? Assume the PbO(s) takes up negligible volume.
Answer:
0.486atm is the pressure of the cylinder
Explanation:
1 mole of Pb(NO₃)₂ descomposes in 4 moles of NO2 and 1 mole of O2. That is 1 mole descomposes in 5 moles of gas.
To find the pressure of the cylinder, we need to find moles of gas produced, and using general gas law we can determine the pressure of the gas:
Moles Pb(NO₃)₂ and moles of gas:
3.31g * (1mol / 331g) = 0.01 moles of Pb(NO₃)₂.
That means moles of gas produced is 0.05 moles.
Pressure of the gas:
Using PV = nRT
P = nRT/V
Where P is pressure (Incognite)
V is volume (2.53L)
R is gas constant (0.082atmL/molK)
T is absolute temperature (300K)
And n are moles of gas (0.05 moles)
P = 0.05mol*0.082atmL/molK*300K / 2.53L
P = 0.486atm is the pressure of the cylinder
Use the arrangement of particles in solids and gases to explain why solids are not as easy to compress as gases.
Answer:
The strong forces of attraction between the particles stop the particles from moving around each other and making the solid flow. The particles are close together so they need to be compressed hard to get them closer.
Explanation:
In solids, strong forces of attraction holds the particles together in a three-dimensional structure. The particles form an orderly arrangements called Lattice.
What is the equation that describes the relationship of force, mass, and acceleration?
Answer:
f=ma
Explanation:
Force is measured in newtons btw
