A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
What is a mole ?A mole is a unit of measurement which relates the molar mass to the amount of the number of atoms and molecules .
1 mole = 6.022 *10²³ molecules or atoms
Molecular weight of copper = 63.55
290 g of Copper = 290/63.55 = 4.56 moles
1 mole has 6.022 *10²³ molecules or atoms
4.56 mole has 4.56 *6.022*10²³ molecules or atoms
= 2.748 *10²⁴ molecules.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
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Which of the following is the correct set-up for the problem: How many grams of water will be produced from 3.2 moles of oxygen and an excess of C2H4?
Option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
Reaction between oxygen and etheneEthene (C2H4) burns in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O) along with the evolution of heat and light.
C₂H₄ + 3O₂ ----- > 2CO₂ + 2H₂O
from the equation above;
3 moles of O₂ ---------> 2(18 g) of water
3.5 moles of O₂ ----------> x
[tex]x = 3.2 \times [\frac{2 \ moles \ H_2O}{3 \ moles \ O_2} ] \times[ \frac{18.02 \ g \ H_2O}{1 \ mole \ H_2O} ][/tex]
Thus, option C is the correct set of the problem for mass of water produced by 3.2 moles of oxygen and an excess ethene.
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An atom of an element is shown by the model.
How is the model useful
Answer:
I believe it is useful as it shows how electrons are distributed in the shells (energy levels) of an iron atom. An atom is the smallest particle of an element that can take part in a chemical reaction. It contains the nucleus and the shells (energy levels). the nucleus contains protons and neutrons while the shells contain electrons.
Explanation:
Calculate the how many sodium atoms must react completely to give 33,6 dm³ hydro-
gen gas at STP.
2Na+ 2H₂O → 2NaOH + H₂(g)
To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.
What is Mole concept ?A mole is a unit of measurement used to measure the amount of any fundamental entity (atoms, molecules, ions) present in the substance.
As according to the given equation, 2 moles (ie 12.04 x 10²³ atoms) of Na-atoms produces 1 mole (22.4 ltr) of H₂-gas.
Hence, to produce 33.6 ltr (equivalent to 33.6 dm³) of H₂-gas produced by ;
= 12.04 x 10²³ atoms of Na / 22.4 ltr of H₂-gas x 33.6 ltr
= 18.06 x 10²³ atoms of Na
Hence, To give 33.6 dm³ hydrogen gas at STP, 18.06 x 10²³ atoms of Na must react completely.
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Which factors affect heat transfer between a warm and a cool substance?
the time it took to heat the substance, the area of contact, and the specific heats of the substances
O the amount of time of contact, the area of contact, and the specific heats of the substances
O the time it took to heat the substance, the area of the substances, and the specific heats of the substa
O the amount of time of contact, the area of the substances, and the specific heats of the substances
The amount of time of contact, the area of contact, and the specific heats of the substances. Hence, option A is correct.
What are specific heats?The heat in calories is required to raise the temperature of one gram of a substance one degree Celsius.
Factors that affect the rate of heat flow include the conductivity of the material, the temperature difference across the material, the thickness of the material, and the area of the material.
Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
The amount of time of contact, the area of contact, and the specific heats of the substances.
Hence, option A is correct.
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Answer: The answer is C and D
B: If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.
C: If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.
Explanation: I took the test on edg
The molecular geometry of the PF3 molecule is __________, and this molecule is ________.
O tetrahedral, unipolar
O trigonal pyramidal, nonpolar
O trigonal pyramidal, polar
O trigonal planar, nonpolar
O trigonal planar, polar
Answer:
C.) trigonal pyramidal, polar
Explanation:
Around the phosphorus central atom, there are 3 fluorine atoms and 1 lone pair. This makes the shape tetrahedral, but gives it a trigonal pyramidal geometry. The lone pair on the phosphorus disrupts the balance of the molecule and pulls the electrons towards it. This makes the molecule polar.
A neutral atom of Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Therefore, Na has _________________________ protons.
Answer:
11
Explanation:
Atomic number is the number of PROTONS an element has .
Question 1 (1 point)
Using the graph from the article, which air pollutant caused a change in bird abundance?
Question 1 options:
tropospheric ozone (O3)
fine particulates (PM 2.5)
Answer:
Di ko na po matandaan yung answer ko Jan kasi
nakalimutan ko po sorry talaga
Explanation:
Determine the mass of hydrogen gas collected in a container if the gas occupies
44.8 L at STP.
Answer:
Hope this helps kinda got confused mid way
Explanation:
So the hydrogen sulphide is H2S for the molecular formula. Then the mass of hydrogen sulphide would be 1×2+32= 34g/mol At STP.
Why we use cotton cloth to mop the floor?
Answer:
because cotton have a good absorbing quality and can absorb water more which is used to mop the floor
Explanation:
Two substances both exhibit hydrogen bonding Substance A has a boiling point of 78.4°C. Substance B has a boiling point of
100°C. Which statement correctly compares the substances? (1 point)
O Substance A has stronger bonds, and it takes less energy to undergo a phase change.
O Substance B has stronger bonds, and it takes less energy to undergo a phase change.
O Substance B has stronger bonds, and it takes more energy to undergo a phase change.
O Substance A has stronger bonds, and it takes more energy to undergo a phase change.
Answer: Substance B has stronger bonds, and it takes more energy to undergo a phase change.
Explanation:
Substances with higher boilings have stronger intermolecular forces, and thus require more energy for phase changes to occur.
Part E
Tsunami evacuation plans often consider the elevation of the community and its distance from the shoreline when
deciding which towns to evacuate. How could this data help in building new homes and communities along coastal areas
that are prone to tsunamis?
Answer:
make the house elevated
You titrate 25.0 mL of HCl solution of an unknown concentration with a 0.190 M NaOH solution. Complete neutralization of the HCl solution requires the addition of 24.6 mL of titrant.
A titration is defined as 'the process of determining the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalence is achieved (the equivalence point)'.
The Molarity of the HCl Solution requires the addition of 24.6 mL of titrant is 0.0836 M (to 3 significant figures)
What is Titrant?A reagent solution of precisely known concentration that is added in titration
Given reaction HCl + NaOH ===> NaCl + [tex]H_2O[/tex] neutralization reaction
Note that the mole ratio is 1:1 meaning that 1 mole HCl reacts with 1 mole NaOH to produce 1 mole NaCl and 1 mole [tex]H_2O[/tex]
Find moles of NaOH used:
18.45 ml x 1 L/1000 ml x 0.085 mol/L = 0.002091 moles NaOH used
This meant that there must be 0.002091 moles of HCl present in the 25.0 mls.
We want to find the molarity (M) which is moles HCl/liter of solution. We know the moles, and we also know the liters of solution (25.0 mls x 1 L / 1000 mls = 0.025 liters)
M = 0.002091 moles HCl / 0.025 liters = 0.08364 M = 0.0836 M (to 3 significant figures)
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The vapor pressure of benzene at 25°C is 95.1 mm Hg and of toluene 28.4 mm Hg. The mass fractions of benzene and toluene in a solution are 0.5.
a) Calculate the partial pressure of benzene and toluene above the solution.
b) Calculate the total vapor pressure above the solution.
c) Calculate the vapor composition above the solution.
Answer:
df dffdffdfd dffd ff d
Explanation:
df fd df f df df dfdf f fdf df df df fd
How many moles of aluminum do 6.4×1024 aluminum atoms represent?
Answer:
11 moles Al
Explanation:
To find the amount of moles, you need to use Avogadro's number to convert the atoms to moles. Since the value you were given has 2 significant figures, the final answer should also have 2 sig figs.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
6.4 x 10²⁴ atoms Al 1 moles
---------------------------- x ------------------------------ = 10.6 moles Al
6.022 x 10²³ atoms
= 11 moles Al
An air mattress is filled with 0.55 moles of air. The air inside the mattress has a temperature of 295 K and an absolute pressure of 3.5 kilopascals. What is the volume of the air mattress?
The volume of the air mattress is
liters.
The volume of the air mattress in litres is 385 litres when absolute pressure was 3.5 kilopascals.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
P= 3.5 kPa
V=?
n= 0.55 moles of air
T= 295K
R= 8.314 (L kPa/mol K)
We use the constant rate of 8.314 because we are using kilopascals in this problem.
Using the equation:
PV=nRT,
V = [tex]\frac{0.55 \;moles \;X \;8.314 \;L \;k\;Pa/mol k \;X \;295 K}{3.5 \;kPa}[/tex]
V = 385.4132857 L.
Hence, the volume of the air mattress in litres is 385 litres.
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determine the number of gram of gas produced when 4.66 mole of water produced from the complete combustion of butane
.we can read the chemical preparation of the reaction as: "4 g of hydrogen react with 32 g of oxygen to give 36 g of water". :)
advantages of artificial silk over natural silk
Answer:
Less expensive than natural fibers
Strong and long-lasting
Easily available
Easy to maintain
Dry up quickly
b. The sedative Demerol hydrochloride has the formula
C15H22CINO2. How many grams are in 0.025 mole of
Demerol hydrochloride?
Dinitrogen oxide (or nitrous oxide), N₂O, also known as
laughing gas, is widely used as an anesthetic in dentistry.
The number of grams present in 0.025 mole of Demerol hydrochloride is 7.094 grams.
What is Demerol hydrochloride?It is a drug used in treating severe or moderate pain.
The moles are given = 0.025
The formula is C₁₅H₂₂CINO₂
The elements that present are C, H, Cl, N, O.
The molecular weight are given:
Carbon: 12.0107
Hydrogen: 1.00784
Chlorine: 35.453
Nitrogen: 14.007
Oxygen: 15.999
Multiply the molecular weight with moles and add them
(15 x 12.0107) + (22 x 1.00784) + (1 x 35.453) + (1 x 14.007) + (2 x 15.999) = 283.79098 grams per mole.
Now, multiply the number of moles given with the total molecular weight
283.79098 x 0.025 = 7.094
Thus, the number of grams are 7.094.
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what effect does a catalyst have on a reaccion rate an the products formed in a reaccion
For the reaction
2A(g)+2B(g)+C(g)⟶3G(g)+4F(g)
the initial rate data in the table was collected, where [A]0 , [B]0 , and [C]0 are the initial concentrations of A , B , and C , respectively.
Experiment [A]0 (mmol⋅L−1) [B]0 (mmol⋅L−1) [C]0 (mmol⋅L−1) Initial rate (mmol⋅L−1⋅s−1)
1 11.0. 200.0 220.0 8.80
2 22.0 200.0 165.0 17.6
3 22.0 400.0 55.0 70.4
4 11.0 200.0 110.0 8.80
Reactant A is first order reactant, Reactant B is second order reactant, and Reactant C is zero order reactant...
1. What is the overall order of the reaction ______ ???
2. Write the rate law for the reaction where is the rate constant. Rate = k___???
3. Calculate the rate constant, , and identify its units. K = ____?????
4. Determine the initial rate of the reaction when [A]0=4.87 mmol⋅L−1 , [B]0=0.184 mmol⋅L−1 , and [C]0=12.0 mmol⋅L−1 . Initial Rate = _______ mmol⋅L−1⋅s−1 ??????
The overall order of the reaction is 3 and the rate law for the reaction is rate = [A]^n [B]^m [C]^l
How to find the Order of Reaction?
1) The order of reactant A is first order reactant because a first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly dependent on the concentration of only one reactant.
The order of reactant B is second order reactant because a second order reaction is a type of chemical reaction that depends on the concentrations of one-second order reactant or two first-order reactants.
Thus, the overall order of the reaction is 3.
2) The rate law in this reaction is;
rate = [A]^n [B]^m [C]^l
But in this question, since the reactant C is zero order, then it will be simplified to; rate = k[A][B]² .
3) When we plug in the initial concentrations of A and B, we will get the rate constant of the problem which is k = 20.
4) The initial rate when [A]0=4.87 mmol⋅L−1 , [B]0=0.184 mmol⋅L−1 , and [C]0=12.0 mmol⋅L−1 is;
Rate = 20 * 4.87 * 0.184²
Rate = 3.3
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Question 2
2C4H10 + 1302 -> 8CO2 + 10H₂O
If 2.46 g H₂O are produced by a reaction, how many moles of C4H10 were used?
Answer:
2 mole of C4H10 were used in this reaction.
if the formula was X203 what is the charge of X
Answer:
Formula-Q = W /V
Explanation:
*hope it's help*
Answer:
[tex]3+[/tex]
Explanation:
[tex]\text{X}_2\text{O}_3 \leftrightharpoons 2\text{X}^{3+}+3\text{O}^{2-}[/tex]
Monosaccharides and disaccharides are what kind of molecules?
Answer:
They are small molecules
Explanation: Hope this helps
Answer: C) Carbohydrates
Explanation:
A) Lipids
B) Nucleic acids
C) Carbohydrates
D) Proteins
apex
How many moles of H₂O are equivalent to 97.3 grams of H₂O? (H = 1.008 g/mol, O = 16.00 g/mol)
Answer:
5.40
Explanation:
you set up the equation with the given value first which is 97.3grams, and grams also goes on the bottom of the equation since the grams have to cancel out to make a mol. calculate the grams of H20 which is 18.016, then put it on the bottom of the equation, then put 1 mol on top.
97.3g x 1mol/18.016
Answer:
5.4 moles
Explanation:
H2 O mole weight 1.008 * 2 + 16 = 18.016 gm/mole
97.3 gm / 18.016 gm/mole = 5.4 moles
Which is an unreliable source?
A scientist who studies dinosaurs presents her research on velociraptors at a science convention.
An advertisement for acne medication claims it can clear up acne in less than one week.
An article on the Centers for Disease Control and Prevention (CDC) website discusses the salmonella bacteria.
A chemistry teacher discusses possible projects for the upcoming science fair.
The source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.
What are citable sources?Citable sources are those sources that are gotten from places that are proven to be of good standards and not from mere claims such as:
Science journalsprofessional organizationsgovernment agenciesTherefore, the source that is unreliable is an advertisement for acne medication claims it can clear up acne in less than one week.
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The electron configuration of an element is 1s^2 2s^2 2p^6. Describe what most likely happens when an atom of this element comes near an atom having seven valance electrons. (5 points)
Answer:
In some cases, they could bond to form covalent compounds. However, in most instances they will not interact.
Explanation:
Remember that elements desire to have a full octet (8 valence electrons). The configuration given represents an element with 8 valence electrons. I know this because the outermost shell (denoted by the 2 coefficient) has 8 electrons (2s²2p⁶ = 2 + 6 = 8). Therefore, this element is stable.
The other atom has 7 valence electrons. Since it is 1 electron away from having a full octet, it really wants 1 more electron. The original element is unlikely to give up an electron because that would prevent it from having a full octet. As such, when the atoms are close to one another, they will most likely not interact. The element with the full octet is most likely a noble gas, and these elements rarely form bonds. Noble gases can form bonds with halogens (elements with 7 valence electrons) but only if there are excess halogens and particular noble gases in the system.
The electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.
What is chemical bond?Chemical bond is defined as any of the interactions that allow for the grouping of atoms into molecules, ions, crystals, and other stable species that make up ordinary substances.
It can also be defined as a connection between atoms in molecules or compounds, as well as between ions and molecules in crystals.
There are basically four types of chemical bond.
Covalent bondIonic bondMetallic bondMolecular bondThus, the electron configuration of an element is 1s2 2s2 2p6 is Neon with atomic number 10. They either will form covalent bond with other element of does not from bond with any other element.
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The direction of a reflected ray will always match its:
angle of incidence.
refracted ray.
diffused angle.
None of the choices are correct.
Answer:
angle of incidence.
How many moles of MgCl2 where needed to make a 650.0 mL solution a concentration of 0.962 M?
Answer:
0.625 moles MgCl₂
Explanation:
Since you were given a molarity value and volume, you should use the molarity equation to find moles. The equation looks like this:
Molarity (M) = moles / volume (L)
To find moles, you need to (1) convert mL to L (by dividing by 1,000) and then (2) plug the numbers into the formula and simplify to find moles. The final answer should have 3 sig figs as the lowest amount of sig figs in a given value is 3.
Step 1:
650.0 mL / 1,000 = 0.6500 L
Step 2:
Molarity = moles / volume
0.962 M = moles / 0.6500 L
(0.962 M) x (0.6500 L) = moles
0.625 = moles
differentiate between electrolytic and metallic conductors.
[tex] \\ [/tex]
ty! ~
Explanation:
Metallic conductors contain free electron for conduction of electricity and is a good conductor of heat and electricity
electrolytic conductors contain ions for conduction
Which scientist performed the cathode ray experiment leading to the discovery of electrons
The scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.
What is a cathode ray?A cathode ray is a tube that contains negatively charged electrode( that is the cathode) which emits electrons when heated at a low pressure.
The cathode ray was used by the scientist, J.J. Thomson to find the ratio of charge to mass (e/m) of the electrons.
Therefore, the scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.
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