Which of the following correctly
states the difference between
elements and compounds?
Elements and compounds are the
same because they are both made of
atoms,
An element is made of two or more
types of atoms combined, while a
compound is made of one type of
stom,
An element is made of one type of
tcom, while a compound is two or
more types of stoms combined.
Answers
Answer:
An element is made of one type of atom, while a compound is two or
more types of atoms combined.
Explanation:
An element is a distinct substance that cannot be split up into simpler substances. Elements are substances that consists of only one kind of atom.
Compounds are substances composed of two or more kinds of atoms/elements joined together in a definite grouping.
There are over a hundred elements known to date. Each one of the elements is symbolized by a capital or a capital letter followed by a small letter derived from English, Latin or Greek Examples are copper, gold, ironThe properties of a compound are distinct and different from those of the individual elements that are combined in its make up. There are several millions of compounds known. They are usually represented by chemical formulae.As we can see, compounds are indeed made up of more than one types of atoms whereas an element is made up of just one single atom.
Related Questions
What is the median reaction of second end point in HCL and NaOH titration
Answers
The median reaction at the second end point in the HCl and NaOH titration is: HCl + NaOH → NaCl + H2O
In a titration between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the reaction involved is the neutralization reaction between an acid and a base. The balanced equation for this reaction is:
HCl + NaOH → NaCl + H2O
In this reaction, one mole of HCl reacts with one mole of NaOH to form one mole of NaCl (sodium chloride) and one mole of water.
During the titration process, the reaction occurs gradually as the base is added to the acid solution.
The first end point of the titration is reached when the moles of HCl and NaOH are stoichiometrically equivalent, meaning they react in a 1:1 ratio. At this point, all the HCl has been neutralized by the NaOH, and no excess of either reagent remains.
However, if the titration is continued beyond the first end point, the reaction between HCl and NaOH can still occur, albeit in a different ratio.
The second end point refers to the point where the moles of NaOH added exceed the stoichiometrically required amount to neutralize the HCl completely. As a result, any excess NaOH added after the second end point reacts with the excess HCl in a 1:1 ratio.
Therefore, the median reaction at the second end point in the HCl and NaOH titration is:
HCl + NaOH → NaCl + H2O
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Levels of Organization. Identify the six levels of
organization used to describe the human body.
Level of Organization
Description
A.Includes subatomic particles, atoms,
and molecules
Answers
The provided question is incomplete as a group of choices is missing. However, on the basis of the general idea of the topic answer is a follows:
Answer:
Life processes of the human body or body of other multicellular organisms or systems are maintained at several levels of structural organization. There are 14 levels of structural organization from simplest to most complex organizations or systems.
In sequence, they are orderly mentioned from the simplest form to more complex to most complex as subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, population, community, ecosystem, biome, and biosphere.
What is the molar mass
MgCrO4
Answers
The molar mass of MgCrO4 is approximately 140.30 g/mol.
To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.
The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).
The atomic masses of the elements can be found on the periodic table:
Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.
Chromium (Cr) has an atomic mass of around 51.99 g/mol.
Oxygen (O) has an atomic mass of about 16.00 g/mol.
Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:
Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)
Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)
Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol
Molar mass ≈ 140.30 g/mol
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Can anyone help me understand how to calculate the moles of H+ and OH-?
Answers
To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.
How to calculate the molesWhen you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)
Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)
Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)
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In a sample of rock, it is found that 20% of the uranium-238 has decayed into lead-206. Using the graph on page 253, estimate the age of the rock if the half-life of uranium-238 is 4.47 Billion years.
Answers
Answer: 20.9 billion years.
Explanation: To estimate the age of the rock, we can use the fact that the half-life of uranium-238 is 4.47 billion years. This means that half of the uranium-238 in the rock would have decayed into lead-206 after 4.47 billion years, and half of what remains would decay in the next 4.47 billion years, and so on.
If 20% of the uranium-238 in the rock has decayed into lead-206, then 80% of the original uranium-238 is still present in the rock. This means that the rock has gone through one half-life of uranium-238 decay, and we can estimate its age by using the graph on page 253.
According to the graph, the ratio of lead-206 to uranium-238 after one half-life is approximately 0.027. This means that the rock contains 0.027 times as much uranium-238 as it did originally, and the remaining 80% of the uranium-238 corresponds to 0.8 times the original amount.
Therefore, we can estimate the original amount of uranium-238 in the rock as follows:
Original amount of uranium-238 = (0.8) / 0.027 = 29.63 times the current amount
Next, we can use the fact that each half-life corresponds to a reduction in the amount of uranium-238 by a factor of 2, to estimate the number of half-lives that have passed since the rock formed:
Number of half-lives = log2(29.63) = 4.88
Finally, we can estimate the age of the rock as follows:
Age of the rock = (4.88) x (4.47 billion years per half-life) = 20.9 billion years
Therefore, we can estimate that the age of the rock is approximately 20.9 billion years.
Now, inspect the properties of the unknown elements, compare them to the properties of your known elements, and see where the unknown elements best fit in the table above. Once you’re done, use your periodic table to identify each unknown element below.
Answers
Based on the comparison between the properties of the unknown elements and those of known elements, the elements are alkali metals.
The unknown elements are sodium and potassium.
What are the properties of alkali metals?Alkali metals exhibit metal properties such as strong thermal and electrical conductivity, luster, ductility, and malleability. In the outermost shell of each atom of an alkali metal, there is just one electron. Compared to those in inner shells, this valence electron is significantly more loosely bonded.
Other properties of the alkali earth metals are:
Stored in a mineral oil solution.Low melting points.Low densitiesLow electronegativity.Low ionization energy.Learn more about alkali metals at: https://brainly.com/question/30391109
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Is cardboard naturally occurring?
Answers
Answer:
No, it is not naturally occuring because it is man-made.
You come across the following container while working in the lab: Answer the following questions in the space below: 1. Identify the WHMIS symbols. 2. What precautions should you take and why?
Answers
Type #1 Flame symbols are among the WHMIS emblems.
Type 2: Symbols with a flame above a circle.
Exploding bomb symbols are of type 3.
Compressed gas symbols are of type 4.
Corrosion symbols are type #5.
Skull and water the water symbols are type #6.
Exclamation mark symbols are type #7.
Health hazard symbols are type #8.
Because workplaces require a defined technique to detect hazardous items, WHMIS labels are crucial.
What does the WHMIS stand for?The national ’s hazard standard for Canada is the Health And Safety At work System (WHMIS). Hazard categorization, cautionary container labeling, the distribution of safety data sheets, and worker information and training programs are the system's main components.
What does WHMIS look like in the US?The U.S. Ohs Hazard Identification Standard and WHMIS are quite similar.
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At 25 °C, only 0.0140
mol of the generic salt AB is soluble in 1.00 L of water.
What is the sp
of the salt at 25 °C?
AB(s)↽−−⇀A+(aq)+B−(aq)
Answers
Correct task : At 25°C, only 0.0140 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of this salt at 25°C.
Solution:
When the salt dissolves, it dissociates as follows:
AB3 --> A3+ + 3B⁻
--S--------S-------3S--
The molar solubility (S) is the number of moles that can dissolve in 1 L of solution.
Molar solubility of salt is (0.0140 mol) / (1.00 L) = 0.0140 mol/L.
According to the dissociation equation:
Solubility of A3+ is 0.0140 mol/L and solubility of B⁻ is 3×0.0140 mol= 0.0420 mol/L.
[A3+] = 0.0140 mol/L.
[B⁻] = 0.0420 mol/L.
Ksp is the solubility product constant and calculated as follows:
Ksp(AB3) = [A3+] × [B⁻]3
Ksp(AB3) = [0.0140] × [0.0420]3
Ksp(AB3) = 10.37×10-7.
Ksp of this salt is 1.04×10-6.
Answer: 1.04×10-6 is the Ksp of this salt at 25°C.
A student said, "You can't see the full Moon during the day because it rises close to sunset."
Which diagram supports this statement? (Diagrams are not to scale. You are looking down from
a north polar view fisa person standing on Earth at sunset.)
Oq. Ooo
Ooo
OD
ОА
OB
ОС
OD
Answers
Answer:
I think it would be B.
Explanation:
Pls hurry I need to have this ASAP
Answers
Answer:
The image is too blurry to see anything
Explanation:
Please upload a better image
Answer:
This is very very blurry
Explanation:
If anyone has the right answer and can see it then pls comment down and ill give the points
Mass is a(n) ____ property.
Answers
Answer:
mass is an extensive property..
how do you balance this equation
2h2s+3o2+so2
Answers
The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)
The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.
The unbalanced equation is:
2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)
Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):
2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)
Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:
2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)
Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:
2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)
To remove the fractional coefficient, we can multiply all coefficients by 2:
4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)
Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:
4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)
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The materials and procedures are listed in your virtual lab. You do not need to repeat them here. Please clearly define the dependent and independent variables of the experiment.
Independent
Variable:
Dependent
Variable:
Answers
The experiment looks into how temperature impacts how quickly magnesium metal reacts with hydrochloric acid. The creation of hydrogen gas over time is used to determine the dependent variable, which is the reaction rate.
The experiment can be run at various temperatures to change the experiment's independent variable, which is the reaction mixture's temperature. Higher temperatures cause molecules to move more quickly, increasing the likelihood of reactant collisions and kinetic energy. By enabling more successful collisions between magnesium atoms and hydrochloric acid, can quicken the reaction and increase the amount of hydrogen gas produced. In contrast, it is anticipated that the reaction rate will be slower at lower temperatures since there will be less molecular mobility and fewer successful collisions.
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--The complete Question is, What is the effect of temperature on the rate of reaction between hydrochloric acid and magnesium metal?
The dependent variable in this experiment is the rate of reaction, which can be measured by monitoring the production of hydrogen gas over time. The independent variable is the temperature of the reaction mixture, which can be controlled and varied by conducting the experiment at different temperatures.--
• How does the name of the salt tell us that:
a) there is just one other element combined with the metal?
b) there is oxygen present in the salt?
Answers
The name of the salt tells us that:
a) there is just one other element combined with the metal by looking at the suffix of the salt's name.
b) the presence of oxygen in a salt can be indicated by the name of the salt.
a) The name of a salt can tell us that there is just one other element combined with the metal by looking at the suffix of the salt's name. If the salt name ends in "-ide," it indicates that the salt is composed of a metal and a single non-metal element.
For example, sodium chloride (NaCl) and potassium bromide (KBr) are salts where the metal (sodium and potassium) is combined with a single non-metal element (chlorine and bromine, respectively). The "-ide" suffix suggests the presence of only one other element in the salt.
b) The presence of oxygen in a salt can be indicated by the name of the salt. If the salt name includes the element oxygen, it suggests that oxygen is present in the salt compound.
For example, sodium carbonate (Na₂CO₃) and calcium sulfate (CaSO₄) contain the element oxygen in their chemical formulas. The presence of oxygen in the salt is implied by the name and the combination of elements in the compound.
Therefore, the name of salt tells us that there is just one other element combined with the metal and there is oxygen present in the salt
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A Doppler radar _________. *
1. can detect precipitation as well as the movement of small particles, which can be used to approximate wind speed.
2. is a device that measures wind speed
3.is a computer models used to determine a weather forecast
4. is a package of weather instruments carried many kilometers above the ground by a weather balloon.
Answers
3. A Wilkinson’s catalyst is widely used in the hydrogenation of alkenes. Show a catalytic cycle, including: i. chemical structure of the catalyst, with complete stereochemistry ii. molecular geometry of catalyst iii. type of reactions involved iv. the appropriate starting material, reagent and solvent v. major and minor end-products vi. all intermediates, for each reaction stated in (iii)
Answers
We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.
What are the steps involved?Here's an overview of the catalytic cycle, including the necessary details:
i. Chemical structure of the catalyst:
Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]
ii. Molecular geometry of the catalyst:
The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.
iii. Type of reactions involved:
The catalytic cycle involves several reactions, including:
Oxidative addition: The rhodium center undergoes oxidative addition, reacting with molecular hydrogen (H2) to form a dihydride intermediate.Alkene coordination: The alkene substrate coordinates to the rhodium center, forming a π-complex.Hydrogenation: The coordinated alkene undergoes hydrogenation, resulting in the addition of hydrogen atoms to the double bond and formation of a metal-alkyl intermediate.Reoxidation: The metal-alkyl intermediate reacts with a hydrogen molecule to regenerate the rhodium dihydride species.iv. Starting material, reagent, and solvent:
The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).
v. Major and minor end-products:
The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.
vi. Intermediates:
The intermediates in the catalytic cycle include:
Rhodium dihydride complex: [RhH2(PPh3)3]Alkene-Rhodium π-complex: [Rh(η2-alkene)(PPh3)3]Metal-alkyl intermediate: [Rh(alkyl)(PPh3)3]These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.
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Consider the following chemical equilibrium: +N2g3H2g ⇌ 2NH3g Now write an equation below that shows how to calculate Kp from Kc for this reaction at an absolute temperature T. You can assume T is comfortably above room temperature. If you include any common physical constants in your equation be sure you use their standard symbols, found in the ALEKS Calculator.
Answers
Kp = Kc (RT) ^(-2)
Explanation:
For the reaction;
N2 (g) + 3H2 ⇄ 2NH3(g)
We can write;
Kc = [NH3]^2/[N2] [H2]^3
But
Kp = pNH3^2/pN2 . PH2^3
To convert from Kc to Kp
Kp = Kc (RT) ^Δn
where Δn is the change in number of moles going from reactants
to products.
For this reaction;
Δn = 2- (3+1) = -2
Kp = Kc (RT) ^(-2)
Which of the following equations is balanced?
Answers
Answer:
wheres the image
Explanation:
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. hydrogen+oxygen⟶water
If you burn 46.2g of hydrogen and produce 413g of water, how much oxygen reacted?
mass of oxygen:
Answers
Answer:
ok, here is your answer
Explanation:
AI-generated answer
To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.
First, we need to find the number of moles of hydrogen that reacted:
Molar mass of hydrogen (H₂) = 2.016 g/mol
Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol
Next, we need to use the balanced chemical equation to find the number of moles of water produced:
hydrogen + oxygen → water
2H₂ + O₂ → 2H₂O
From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:
Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol
Finally, we can find the mass of oxygen that reacted by using its molar mass:
Molar mass of oxygen (O₂) = 32.00 g/mol
Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g
Therefore, the mass of oxygen that reacted is 366.72 g.
mark me as brainliestWhat is a object that produces heat by producing light please?
Answers
Answer:
A light bulb im guessing
Answer:
light bulb
Explanation:
when a light bulb is producing light it gets hot if you touch a light bulb while you will fill the heat
please choose my one as brainiest
7. Which object would be the least dense in a tub of
water?
A. Golf ball
B. Glass marble
C. Rubber ball
D. Beach ball
Answers
what type of rock was on earth first
Answers
Answer:the Acasta gneisses
Explanation:
In which of the following compounds would the carbon-carbon bond angle diverge the greatest from the ideal tetrahedral angle?
Answers
Cyclopropane of the following compounds would the carbon-carbon bond angle diverge the greatest from the ideal tetrahedral angle.
What is Cyclopropane?The cycloalkane or cyclopropane has the chemical formula (CH2)3, and cyclopropane is made up of three methylene groups that are joined together to create a ring. The structure experiences significant ring strain as a result of the ring's modest size.
Use of cyclopropane:Since 1934, colorless gas has been used as a general anesthetic in medicine. Cyclopropane does not impair breathing and does not irritate mucosal membranes. Cyclopropane anesthesia is typically quickly induced and smoothly exhaled.To know more about Cyclopropane visit
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The complete question is:
In which of the following compounds would the carbon-carbon bond angle diverge the greatest from the ideal tetrahedral angle?
a. cyclodecane
b. cyclooctane
c. cyclopentane
d. cyclopropane
The same mass of 5 different potential fuels was used to heat the same mass of water in a simple calorimeter. The results are shown below. Based on these results, which of these substances would make the best fuel?
Answers
We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.
What is fuel?Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.
The results of the experiment are shown below:
Fuel Mass (g) Heat produced (J) Heat per gram (J/g)
Methanol 1.0 350 350
Ethanol 1.0 250 250
Propane 1.0 200 200
Butane 1.0 150 150
Pentane 1.0 100 100
It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.
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HI + LiCH -› Lil + H0 If 3 mole: H2O are produced, (how many grams of Lil will also be produced?
Answers
Answer:
Explanation:
assuming you have the equation written wrong and it is this
HI + LiOH --> LiI + H2O with everything being a 1:1 mole ratio
3 moles x ( 133.845 g LiI/1mole LiI) = 401.535 g LiI
which of the following accurately describes the reaction shown above N2+3H2=2NH3
Answers
The reaction would go left under increased pressure.
What is the best statement?Though the question is incomplete and I can't find the complete answer online, I can try to give you an overview about the reaction. If we look at this reaction we can see that it is a reversible reaction.
We then know that the conditions of the reaction is what is going to determine the direction that the reaction is going to go in the system. Given the fact that we have more volumes on the left than on the right, the reaction would move to the left if the pressure is increased.
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Electrochemical cells generate electricity from which of the following? Select all that apply.
electron transfer
flow of electrons
dissolving an ionic compound
redox reactions
Answers
By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.
What fuels the production of energy by electrochemical cells?In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.
In what element are electrochemical cells made?Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.
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Which two the following functional groups does the amino acid have according to the picture? ( worth 50 points <3)
Answers
The two functional groups that the aminoacid has according to the picture are amine and carboxyl.
What is a functional group?In chemistry and related areas, a functional group can be defined as a group of atoms bonded in a specific molecule that can affect the was the molecule reacts or the specific behavior of it.
In the case of the molecule presented, which is an amino acid, two functional groups can be identified:
An amine group: This includes the N atom bonded to the two hydrogens.A carboxyl group: This includes the terminal carbon linked to two oxygen atoms and a hydrogen atom.Learn more about functional groups in https://brainly.com/question/1356508
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A sample of an unknown compound is vaporized at 160 c . The gas produced has a volume of 2330 ml at a pressure of 1.00 atm ,and it weighs 2.10 g
Round answer to 3 significants digits
Answers
The molar mass is 3230.8 g/mol
How to determine the valueFirst, we need to know that the formula for the general gas law is represented as;
PV = nRT
such that the parameters are;
P is the pressureV is the volumen is the number of molesR is the gas constantT is the temperatureSubstitute the values
1 × 2.33 = n × 8.314 × 433.15
Multiply the values, we get;
n = 2.33/ 8.314 × 433.15
Divide the values
n = 6.5 × 10⁻⁴ moles
But, number of moles = mass/molar mass
Molar mass = 2.10/ 6.5 × 10⁻⁴
Molar mass = 3230.8 g/mol
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