The practice is the most sustainable is using cloth grocery bags over and over again.
The sustainable practices are the practices which supports the ecological and economic health . the is of plastic bag , paper or cloth bag over and over again . we have to reuse for the shopping purpose. go for the paperless document. cloth bag are reusable and better than a plastic bags. cloth bag will reduces the plastic use and the pollution will also reduce caused by the plastic bags.
Thus, The practice is the most sustainable is using cloth grocery bags over and over again.
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What is the condensed structural formula for 2,2-dimethylbutane?
CH3(CH2)2CH3
(CH3)3CCH2CH3
C6H4(CH3)2
CH3CH2CH2CH2CH3
The structural formula for 2,2-dimethylbutane in the above task is (CH3)3CCH2CH3.
The correct answer choice is option b.
The structural formula for 2,2-dimethylbutane.It follows that the structural formula for the above compound in the above task has 4 carbon atoms as the parent chain and has 2 different methyl substituents on the same carbon 2.
The image to the paper work is attached for more clearity.
The compound; 2,2-dimethylbutane ( (CH3)3CCH2CH3 ) belong to an alkane family. They have a general formula CnH2n+2.
So therefore, we can now confirm from the explanation given above that the only correct answer for the structural formula of the compound above is (CH3)3CCH2CH3
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Write the net ionic equation for this reaction Fe₂(SO4)3²(aq)+3K₂S(aq) → Fе₂S3(s)+3 K₂SO4(aq)
The wavelength of a particular color of red light is 663 nm. ()
The frequency of this color is
The frequency of the color of red light that has a wavelength of 663nm is 4.52 × 10¹⁴Hz.
How to calculate frequency?Frequency of a wave is the quotient of the number of times (n) a periodic phenomenon occurs over the time (t) in which it occurs.
Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.
Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.
According to this question, the wavelength of a particular color of red light is 663nm. The frequency can be calculated as follows:
663 × 10-⁹ = 3 × 10⁸ ÷ f
f = 3 × 10⁸ ÷ 6.63 × 10-⁷
f = 4.52 × 10¹⁴Hz
Therefore, 4.52 × 10¹⁴Hz is the frequency of the color of the red light.
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The tarnish that forms on objects made of silver is solid silver sulfide; it can be removed by reacting it with aluminum metal to produce silver metal and solid aluminum sulfide according to the reaction,
3Ag2S(s) + 2Al(s) --> 6Ag(s) + Al2S3(s)
How many moles of aluminum are required to remove 0.253 mol of silver sulfide from a silver bowl? Include a road map that shows how you planned the solution.
0.506 moles of aluminum are required to remove 0.253 mol of silver sulfide from a silver bowl.
3Ag2S(s) + 2Al(s) --> 6Ag(s) + Al2S3(s)
2 moles of Al required to make 1 mole Al2S3
1 moles Al2S3= 2 moles Al
0.253 moles Al2S3 = 0.506 moles Al
The mole idea facilitates the measurement of a material's amount. When interacting with particles at the atomic (or molecular) level, it is acknowledged that even a single gram of a pure element has a significant number of atoms. The mole theory is widely used in this context. The most often used unit of measurement is the "mole," which is a count of many particles.
The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". One of the most fundamental entities that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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nacl+cl2=2nacl please help
2Na(s)+Cl2(g) 2NaCl(s) is the balanced equation.
Is NaCl an equation that balances?However, closer examination of this equation reveals that, despite having one sodium atom on each side of the arrow, the reactants contain two chlorine atoms whereas the products have just one. This equation is invalid for use in chemical calculations because it is unbalanced.
What legal principle balances equations?Once more, chemical reactions never result in the creation or destruction of atoms. A balanced chemical equation is this kind of chemical equation. A chemical equation that complies with the law of conservation of matter is said to be balanced.
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Imagine you are sitting in a room with a volume of 23000 liters and a temperature of 69 degrees F. The total air pressure is 766 mm Hg, and the partial pressure from oxygen is 21% of the total pressure. How many grams of oxygen are in the room?
The mass (in grams) of oxygen gas in the sitting room of 23000 liters is 6412.16 grams
How do I determine the mass of oxygen gas?We'll begin by converting 69 °F to °C. This can be obtained as follow:
Temperature (°F) = 69 °FTemperature (°C) =?°C = 5/9(°F - 32)
°C = 5/9(69 - 32)
°C = 20.6 °C
Next, we shall determine the mole of oxygen gas in the room. This is shown below:
Volume (V) = 23000 L Temperature (T) = 20.6 °C = 20.6 + 273 = 293.6 KTotal pressure = 766 mmHg = 766 / 760 = 1 atmPercentage of oxygen = 21%Presure of oxygen (P) = 21% × 1 = 0.21 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?PV = nRT
0.21 × 23000 = n × 0.0821 × 293.6
Divide both sides by (0.0821 × 293.6)
n = (0.21 × 23000) / (0.0821 × 293.6)
n = 200.38 moles
Finally, we shall determine the mass of oxygen gas in the room
Mole of oxygen gas = 200.38 moles Molar mass of oxygen gas = 32 g/molMass of oxygen gas =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of oxygen gas = 200.38 × 32
Mass of oxygen gas = 6412.16 grams
Thus, the mass of oxygen gas is 6412.16 grams
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What mass (in grams) of Mg(NO3)2 is present in 183 mL of a 0.400 M solution of Mg(NO3)2 ?
0.0732 g
10.9 g
6.32 g
67.8 g
Answer:
B.) 10.9 g
Explanation:
To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
(Step 1)
1,000 mL = 1 L
183 mL 1 L
-------------- x ----------------- = 0.183 L
1,000 mL
(Step 2)
Molarity = moles / volume (L) <----- Molarity equation
0.400 M = moles / 0.183 L <----- Insert variables
0.0732 = moles <----- Multiply both sides by 0.183
(Step 3)
Atomic Mass (Mg): 24.305 g/mol
Atomic Mass (N): 14.007 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)
Molar Mass (Mg(NO₃)₂): 148.313 g/mol
0.0732 moles Mg(NO₃)₂ 148.313 g
--------------------------------------- x --------------------- = 10.9 g Mg(NO₃)₂
1 mole
Answer the question(s) below about the following reaction.
2H₂O2 → 2H2O + O2
How many moles of oxygen gas can 5.0 moles of hydrogen
peroxide (H2O2) produce, if decomposition is complete?
2.5 moles of oxygen will be produced.
What is the mole ratio?A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.
The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.
For the given reaction:
2H₂O₂ → 2H₂O + O₂
This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.
So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.
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0.50 g of Mg reacts with excess oxygen in a
bomb calorimeter with a heat capacity of
3290 J/°C. The initial temperature is 21.5 °C
and the final temperature is 25.2 °C.
What is the enthalpy of the reaction?
The enthalpy of the reaction 12173 J/°C
Heat capacity or thermal capability is a bodily belonging of count number, described as the quantity of warmth to be supplied to an object to provide a unit trade in its temperature. The SI unit of heat capacity is joule in line with kelvin. heat capacity is an intensive property.
Heat capability is described as the quantity of warmth strength required to raise the temperature of a given quantity of matter through one diploma Celsius. warmth ability for a given count depends on its length or amount and as a result, it's far an extensive asset. The unit of heat capacity is joule in line with Kelvin or joule according to degree Celsius.
Calculation:-
heat = msΔT
= 0.50 × 3290 × (25.2 - 21.5)
= 0.50 × 3290 × 3.7
= 6086.5 J
q = mΔHf
ΔHf = q/m
= 12173 J/°C
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A 2.00 M HCl solution is diluted by transferring 25.0 mL of the solution to a 100.0 mL volumetric flask and adding water to the line on the neck of the flask. What is the concentration of the solution in the flask?
A) 0.250M
B) 0.500M
C) 1.00M
D) 8.00M
How much water will be needed to make a solution of 5.0 M MgO with 200.0 g MgO?
Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.
given that :
molarity of MgO = 5 M
mass of MgO = 200 g
molar mass of MgO = 40 g/mol
number of moles = mass / molar mass
number of moles of MgO = 200 g / 40 g/mol
= 5 mol
molarity of solution is given as :
molarity = moles of solute / volumes in L
volume = moles / molarity
volume = 5 × 5
= 25 L
Thus, Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.
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The autoionization of water is a reversible reaction.
2H₂O ⇌ H3O⁺ + OH⁻
This reaction is endothermic (ΔH is positive).
What is the effect of increasing temperature of water on:
The numerical value of Kw
Answer 1
Choose...
pH
Answer 2
Choose...
[H3O+ ]
Reaction will move forward and favor according to Le Chatelier's principle on increasing temperature of water.
According to Le Chatelier's principle, the position of equilibrium will shift if a system in a state of dynamic equilibrium is disturbed by a change in its conditions. The point of equilibrium will shift toward the products to offset the additional reactant if you raise the concentration of one of the reactants. For instance, extra N2 will react with H2 in the system if it is added. More ammonia will be produced as a result of this.
Similar to this, the location of equilibrium would move to the left if you reduced the concentration of one of the reactants. In this instance, removing N2 would cause more NH3 to break down into the reactants.
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5 steps to describing bonding:
●
Identify the type of bonding (if not in question)
Describe if electrons are being lost, gained or
shared by each atom
Describe how this changes the atoms involved
e.g. forms Mg2+" (formula of ion) or becomes
stable (gain a full outer shell)
Add a formula for the compound formed if
asked e.g. Mg₂Cl or HCI
Describe the bonding in magnesium oxide using these
steps include the formula for lithium oxide
The electrons that are being lost gained or shared by each atom are Shared electrons.
Atoms and chemical species lose and gain electrons as they react to gain stability. Therefore, metals usually donate electrons to nonmetals to form cations. The number of electrons depends on their position on the periodic table. When an atom gains an electron, its overall charge becomes negative.
When an atom loses an electron its overall charge becomes positive. When an atom gains or loses electrons, its mass does not change. The number of electrons an atom can lose and gain share during a chemical reaction is called its valence. An atom that loses an electron gains a positive charge because it has fewer negatively charged electrons to balance the positive charge of the protons in the nucleus.
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The diagram shows an exchange
surface in the human body. Name the
parts labelled 2.
Enter your answer
Answer: villi/villus
Explanation: The parts labeled 2 are villi, many of which are found in the small intestine.
villi/villus exchange surface in the human body which are found in the small intestine.
what are the function of villi ?They are small finger-like folding in the small intestine, A network of capillaries and a big lymph vessel called the lacteal supply the villi.
These are found in the small intestine's inner walls, Villi are specialized for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path.
They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream. They have a rich blood supply to keep a concentration gradient.
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25 POINTS!!! PLS DO IT FAST In each test, iron(II) sulfate and iron(III) nitrate were combined with the same substance or substances. However, the sulfate and nitrate parts of the compounds didn’t participate in any of the chemical reactions; only the iron ions reacted. Comparing the results for each pair of tests, what can you conclude about the iron(II) and iron(III) ions?
Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.
In the displacement reaction , one atom is displaced by the the another atom according to their reactive strength . the highly reactive atom displace the low reactive atom called as displacement reaction.
The reactions are given as :
FeSO₄ + Zn ----> ZnSO₄ + Fe
Fe(NO₃)₂ + Zn -----> Zn(NO₃)₂ + Fe
Here the zinc is more reactive than the iron . so, Zinc displace the iron in both the cases. Zinc displace the iron in both the cases. The reaction is called as displacement reaction.
Thus, Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.
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Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution.
C₅H₅NHI
The equation that shows that the salt is acidic is;
C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
Is the salt acidic?We know that when we dissolve certain salts in water, the salts could form an acidic, basic or a neutral solution depending on the kind of interaction that the salt could have with the solvent.
Looking at the salt C₅H₅NHI, we can see that the salt can interact with water so as to form the acid that is called hydro iodic acid as shown by the equation; C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
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is neon a metal or a non metal
Explanation:
Neon is a non-metal. it belongs to group 8 or 18 of the periodic table of elements and is also referred to as a noble gas.
Will the following replacement reaction occur? Ca+Au2S3+
Yes, this replacement reaction 3Ca + Au₂S₃ → 3CaS + 2Au.
A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions.
Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.
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HELP !!!!!!! pls. with chemistry
Answer:
Qns no.3: it is not a correct answer
Explanation:
S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.
A propane tank when first filled reads 175. psi. After 1 month of use, the propane tank reads 81. psi.
Note: Reference the Conversion factors for non-SI units table for additional information.
Part 1 of 2
Convert the tank pressure when first filled to mmHg. Be sure your answer has the correct number of significant figures.
m
175. ps1=
mmHg
Answer:
After 1 month of use, the propane tank reads 81
Explanation:
A 90.0 g piece of metal, initially at 98.6°C, is placed into 120.0 g of water initially at 24.3°C. If the final temperature of the water is 34.0°C, what is the specific heat of the metal? (The specific heat of water is 4.184 J/g･°C).
Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.
The expression that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Specific heat of the metalIn this case, you know:
For metal:Mass of metal= 90 gInitial temperature of metal= 98.6 °CFinal temperature of metal= 34 ºCSpecific heat of metal= UnknownFor water:Mass of water = 120 gInitial temperature of water= 24.3 °CFinal temperature of water= 34 °CSpecific heat of water = 4.186 J/gCReplacing in the expression to calculate heat exchanges:
For metal: Qmetal= Specific heat of metal × 90 g× (34 C -98.6 C)For water: Qwater= 4.186 J/gC× 120 g× (34 C - 24.3 C)If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qmetal = + Qwater
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)
Solving:
- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J
Specific heat of metal × 5,814 gC= 4,872.504 J
Specific heat of metal = 4,872.504 J÷ 5,814 gC
Specific heat of metal = 0.8381 J/gC
Finally, the specific heat of the metal is 0.8381 J/gC.
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Question: Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 3.2 kg pumpkin to a height of 1.4 m , then carry it 50.0 m (on level ground) to the check-out stand.
Part A: Calculate the work you do on the pumpkin as you lift it from the ground.
Express your answer using two significant figures. W = ? J
Part B: How much work do you do on the pumpkin as you carry it from the field?
Express your answer using two significant figures. W = ? J
A) The work you do on the pumpkin is 31.36 J as you lift it from the ground.
B) The work is zero as you carry it from the field.
What is work?Work can be defined as the energy spent when applying a force to move an object through a certain displacement.
The work by a force to move an object through a displacement (d) can be written as:
W = Fdcosθ
Where θ is angle between force and displacement.
(a) The mass, the displacement of the pumpkin from the ground, and the angle are:
m = 3.2 kg
d = 1.4 m
θ = 0∘
Here, the force exerted during lifting the pumpkin is equal to the weight of the pumpkin:
F = mg = (3.2)(9.8) = 31.36 N
Thus, the work done when lifting the pumpkin is
W = F d cosθ = (31.36 N)(1.4m)cos(0∘) = 44 J
(b) When carrying the pumpkin, the force exerted will be upward while the displacement of the pumpkin will always be directed forward. Therefore, they are perpendicular (i.e. θ = 90∘) to each other which is the reason why the work is zero.
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Question
Seismic waves travel at different speeds according to type.
What is the speed of seismic waves from fastest to slowest?
Responses
S waves, L waves, P waves
S waves, L waves, P waves
P waves, S waves, L waves
P waves, S waves, L waves
L waves, S waves, P waves
L waves, S waves, P waves
P waves, L waves, S waves
Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.
Which seismic waves are moving more quickly?P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.
Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.
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4. A solid is 5 cm tall, 3 cm wide and 2 cm thick. It has a mass of 129 g. What is its density?
calculate molality 6.20g LiBr in 52.6g water
The molality of 6.2g of LiBr in 52.6g water is 0.0013mol/kg
The molecular weight of LiBr is 86.845 g/mol thus substituting this value in the formula of moles,
Moles of LiBr = grams/molecular weight
Moles of LiBr = 6.20/ 86.845
Moles of LiBr = 0.071 mol
Substituting the value of moles in the formula of molality
Molality= moles/grams of solvent
Molality= 0.071/52.6
Molality= 0.0013 mol/g
Molality, or more specifically, the number of moles of solute contained in a kilogram of solvent, is a unit used to express the concentration of a solution.
The quantity of moles of solute per kilogram of solvent is known as molality, which is denoted by a tiny "m."
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Given the equation 4Al+3O2=2Al2O3 How many moles of oxygen are needed to react with 100 grams of aluminum
Taking into account the reaction stoichiometry, 2.778 moles of oxygen are needed to react with 100 grams of aluminum.
Reaction stoichiometryIn first place, the balanced reaction is:
4 Al + 3 O₂ → 2 Al₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 4 molesO₂: 3 molesAl₂O₃: 2 molesThe molar mass of the compounds is:
Al: 27 g/moleO₂: 32 g/moleAl₂O₃: 102 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 4 moles ×27 g/mole= 108 gramsO₂: 3 moles ×32 g/mole= 96 gramsAl₂O₃: 2 moles ×102 g/mole= 204 gramsMoles of O₂ requiredThe following rule of three can be applied: If by reaction stoichiometry 108 grams of Al react with 3 moles of O₂, 100 grams of Al react with how many moles of O₂?
moles of O₂= (100 grams of Al× 3 moles of O₂)÷ 108 grams of Al
moles of O₂= 2.778 moles
Finally, 2.778 moles of oxygen are needed.
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What is the heat change when 1.25 g of water vapor at 185.3C is cooled to 102.1C?The specific heat of steam is 2.02J/g C
Answer: -210.08 J
Explanation:
Use the formula q = (m)(c)(ΔT)
q = (1.25)(2.02)(102.1-185.3)
q = -210.08 J
This is exothermic! Heat is lost.
Determine the empirical formulae of the compounds which contain:
b 5.85g K, 2.10g N, 4.80g O
The empirical formulae of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.
given that :
mass of potassium , K = 5.85 g
molar mass of potassium = 39 g/mol
mass of nitrogen , N = 2.10 g
molar mass of nitrogen = 14
mass of oxygen , O = 4.80 g
molar mass of oxygen = 16
now, we have calculate the number of mole for each atom :
number of moles of potassium , K = mass / molar mass
= 5.85 / 39
= 0.15 mol
number of moles of nitrogen , N = 2.10 / 14
= 0.15 mol
number of moles of oxygen , O = 4.80 / 16
= 0.3 mol
now, dividing by the smallest one , we get
moles of K = 0.15 / 0.15 = 1
moles of N = 0.15 / 0.15 = 1
moles of O = 0.3 / 0.15 = 2
The empirical formula = KNO₂
Thus, The empirical formula of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.
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what would be the indepenndant variable, control group, and dependant variable in the how much salt is needed to float expirament
In the egg floating experiment, the independent variable is adding salt to the water, the dependent variable is the egg floating in the water and the control group is the beaker just with water.
The egg floating experiment is done to test the density of the egg with respect to the water. Generally, the egg sinks in the water as the egg has a higher density than water.
On the other hand, if salt is added to water to form a salt solution and if the egg is added to that solution, then the egg floats. This is because the density of the egg is lesser than the salt solution leading the egg to float.
Therefore, in this experiment, the independent variable is the amount of salt added to the water and the dependent variable is the egg floating in the water as it is dependent on the amount of salt added the water. Thus, the control group is the beaker with water.
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what moon phase comes one month AFTER a waxing gibbous