Answer:
0.000019952mol/dm3
Explanation:
pH=-log(H+)
4.7= -log(H+)
log(H+)=-4.7
(H+)=10*-4.7=0.000019952
In this lab, you will figure out who was guilty of the classroom food mess by determining which macromolecules are present in the mystery food sample.
Rephrase this statement as a scientific question you can answer through investigation.
PLEASE I NEED UR HELP!!!!! WORTH 100 POINTS
The scientific question that can be answered through investigation will be:
"Which of the four types of macromolecules, and in which proportions, are present in the food sample?"
What is scientific question ?A scientific question is a question that may lead to a hypothesis and help us in. answering (or figuring out) the reason for some observation.
A scientific question simply means a question where a researcher designs a question in order to get an answer to a particular investigation.
According to this question,
Since the researcher wants to know the person responsible for the classroom good mess by determining which macromolecules are present in the mystery food sample, then the question will be "Which of the four types of macromolecules, and in which proportions, are present in the food sample?"
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: 2NaOH + H,S0A - Na,SO A + 2H,0 How many moles of sodium sulfate (Na,SO,) reproduced when 5.0 moles of sodium hydroxide (Na0H) are reacted with excess sulfuric acid? A 2.5 moles B 1.0 moles C 5.0 moles D 2.0 moles
From the reaction, we can see that the number of moles produced is 2.5 moles of Na2SO4
What is a reaction?Chemical reaction involves the combination between two or more species. In this case, the reaction equation is; 2NaOH + H2S04 ----> Na2SO4 + 2H20.
Now we are told that sulfuric acid is in excess hence NaOH is the limiting reactant.
If 2 moles of NaOH produces 1 mole of Na2SO4
5 moles of NaOH produces 5 moles * 1 mole/ 2 moles
= 2.5 moles of Na2SO4
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question 2 of 30
Which of the following is a reduction half-reaction?
OA. Cl₂(1)→ Cl₂(s)
OB. 2Cl + 2e → Cl₂
OC. Cl₂ → 2Cl + 2e
OD. 2C1+ + 2e → Cl₂
SUBMIT
Answer: D
Explanation:
Reduction involves the gaining of electrons.
This eliminates choices A and C.However, charge must be balanced, and this is not the case for choice B, but it is the case for choice D
What type of bond is formed between the following elements/molecules (ionic, polar covalent, or nonpolar covalent)?
Answer:
1.) Ionic
2.) Nonpolar Covalent
3.) Polar Covalent
Explanation:
Ionic bonding generally occurs when a metal and nonmetal wish to donate/receive electrons from each other. These bonds are between two atoms with a large electronegativity difference. In the first diagram, potassium (K) is a metal and chlorine (Cl) is a nonmetal. As you can see, after the reaction, potassium donates an electron to chlorine.
Nonpolar covalent bonding occur when atoms of practically the same electronegativity combine. As such, atoms of the same nature have a zero electronegativity difference and thus always form these bonds.
Polar covalent bonding generally occurs between two nonmetals. These atoms have an intermediate size electronegativity difference. Carbon (C) and chlorine satisfy this rule.
What is the oxidation state of Hg in Hg2Cl₂?
O A. +1
OB. -1
O C. +2
OD. -2
Answer:
+1
Explanation:
The oxidation state of Hg in Hg2Cl2 is +1. It has +1 state. 0=2Hg +2 (-1) Hg=+1. Mercury chloride (HgCl2) is considered as the dominant form of mercury in coal combustion flue gas. The oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. The oxidation number is synonymous with the oxidation state. Determining oxidation numbers from the Lewis structure (Figure 1a) is even easier than deducing it from the molecular formula (Figure 1b). The oxidation number of each atom can be calculated by subtracting the sum of lone pairs and electrons it gains from bonds from the number of valence electrons. Bonds between atoms of the same element (homonuclear bonds) are always divided equally. When dealing with organic compounds and formulas with multiple atoms of the same element, it's easier to work with molecular formulas and average oxidation numbers (Figure 1d). Organic compounds can be written in such a way that anything that doesn't change before the first C-C bond is replaced with the abbreviation R (Figure 1c). Unlike radicals in organic molecules, R cannot be hydrogen. Since the electrons between two carbon atoms are evenly spread, the R group does not change the oxidation number of the carbon atom it's attached to.
source: www.chegg.com
Answer: O A. +1
Explanation: i took the test
Lucite contains 59.9 g C, 8.06 g H,
and 32.0 g O. You want to
determine the empirical formula.
How many moles of H are in the
sample?
{?} mol H
Answer:
8.00
Explanation:
I hope the spurs get wembanyama so bad
pls help
1.
when a magnet spins within a coil of wires, what is produced?
-blue sparks
-glowing light
-nuclear energy
-an electric current
2.
when an electric current flows through a wire:
-a gravitational field is created around the wire
-the wire becomes very cold
-the wire begins to spin
-a magnetic field is created around the wire
help pls
Answer:
1d and 2d is the answer. Hope it helps
Suppose that you add 26.7 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.89 oC compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound
From the calculation, the molar mass of the solution is 141 g/mol.
What is the molar mass?We know that;
ΔT = K m i
K = the freezing constant
m = molality of the solution
i = the Van't Hoft factor
The molality of the solution is obtained from;
m = ΔT/K i
m = 3.89/5.12 * 1
m = 0.76 m
Now;
0.76 = 26.7 /MM/0.250
0.76 = 26.7 /0.250MM
0.76 * 0.250MM = 26.7
MM= 26.7/0.76 * 0.250
MM = 141 g/mol
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An elemen belongs to group 17 of the periodic table. This element is most likely a.
Answer:
halogen
Explanation:
group 17 contains halogens
Answer:
The group 17 falls int he halogen category the element most likely Fluorine Chlorine Bromine Tennessine
Explanation:
The limiting reactant, O2, can form up to 2.7 mol Al2O3. What mass of Al2O3 forms?
Al2O3 : 101.96 g/mol
[?] g Al₂O3
Answer:
280 g Al₂O₃
Explanation:
To find the mass, you need to multiply the given value by the molar mass. This will cause the conversion because the molar mass exists as a ratio; technically, the ratio states that there are 101.96 grams per every 1 mole Al₂O₃. It is important to arrange the ratio in a way that allows for the cancellation of units. In this case, the desired unit (grams) should be in the numerator. The final answer should have 2 sig figs to reflect the given value (2.7 mol).
Molar Mass (Al₂O₃): 101.96 g/mol
2.7 moles Al₂O₃ 101.96 g
------------------------ x ------------------- = 275 g Al₂O₃ = 280 g Al₂O₃
1 mole
the element with a completely filled p-subshell is:
The element with the completely filled p-subshell is Ar (Option C)
What is electronic configuration?This is the arrangement of elecartons in the atomic orbitals of an element. The modern electronic configuration makes use of the s, p, d, f orbital notation where
Sharp (s) = Maximum of 2 electronsPrincipal (p) = Maximum of 6 electronsDiffuse (d) = Maximum of 10 electrons Fundamental (f) = Maximum of 14 electrons How to determine the element with the completely filled p-orbitalTo obtain the correct answer, we shall write the electronic configuration of each element given in the question. This is illustrated below
Na (11) => 1s² 2s²2p⁶ 3s¹P (15) => 1s² 2s²2p⁶ 3s²3p³Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶Al (12) => 1s² 2s²2p⁶ 3s²From the above illustrations, we can see that only Ar has completely filled p-subshell.
Thus, Ar (Option C ) is the correct answer to the question
Complete question
See attached photo
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if the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the highest temperature?
The metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
What is the amount of heat added to each metal?The amount of heat Q = mcΔT where
m = mass of metalc = specific heat capacity of mateal and ΔT = temperature changeTemperature change of the metalMaking ΔT subject of the formula, we have
ΔT = Q/mc
Given that Q and m are the same for each metal,
ΔT ∝ 1/c
We see that the temperature change is inversely proportional to the specific heat capacity.
Since the metals are at the same temperature, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
So, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.
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what will happen when a wax candle burned in air with limited oxygen?
Answer:
The molecules of carbon dioxide are heavier than air. When a result, as they descend over the flame and candle, they push the oxygen and other air molecules out of the path. The oxygen can no longer react with the wax when it is pushed away from the wick. The flame is put out as a result.
Answer:
if the candle is burned in air with limited oxygen supply the candle will go out of fire as the oxygen is reducing....
Explanation:
Hope It Helps!!!
neutral grain spirit is essentially the same as
The neutral grain spirit is essentially known as rectified spirits or ethyl alcohol.
Meaning of neutral grain spiritneutral grain spirit can be defined as raw material that is very concentrated with alcohol used to produce strong alcoholic products.
neutral grain spirit as the name implies is neutral in nature that is it can be blended with any other alcoholic product.
In conclusion, The neutral grain spirit is essentially known as rectified spirits or ethyl alcohol.
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Which of the following statements are true of thermal energy and kinetic
energy?
Check all that apply.
A. All the molecules or atoms in motion have kinetic energy.
B. All the molecules or atoms in motion have thermal energy.
C. Each molecule or atom in motion has thermal energy.
D. Each molecule or atom in motion has kinetic energy.
Answer:
A. All the molecules or atoms in motion have kinetic energy.
B. All the molecules or atoms in motion have thermal energy.
C. Each molecule or atom in motion has thermal energy.
D. Each molecule or atom in motion has kinetic energy.
Explanation:
in an electron configuration code, superscripts placed on a sublevel indicate the number of ?
how many electrons do noble gases have
Noble gases have 8 electrons in the outermost shells.
What are noble gases?They are the chemical elements that belong to group 8A of the periodic table.
They belong to group 8 because they have 8 electrons in their outermost shells. Their electron configuration is an octet. In other words, they do not need to donate or accept electrons to be stable.
Noble gases include helium, neon, argon, etc.
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Which characteristic of money explains why an old dollar is worth as much as a crisp, new dollar?
The characteristic is uniformity.
Uniformity of moneyMoney is said to be uniform because irrespective of the nature it exists, the same amount must have the same purchasing power.
For example, a dollar in paper form and a dollar in coin form must be able to buy the same 1 dollar worth of goods.
Thus, a dollar bill, irrespective of its age, has the same purchasing power as a new, crisp dollar bill.
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Task 2. Protecting Your Model Village from Tsunamis In this task, you will design a model village to withstand the effects of a tsunami. Estimated time to complete: 1 hour You will need the following materials: 2 pieces of printer paper, 8 inches × 11 inches 2 pieces of card stock, 8 inches × 11 inches 1 piece of cardboard, 8 inches × 11 inches a long, shallow plastic container, around 30 inches long, 15 inches wide, and 5 inches deep tape or glue a small plate or tray water a ruler a small bag of sand, about 2 pounds Hypothesis and Data Collection
Part A Before you design your model village, write down the problems you observed in task 1. What were the largest risks to the community? What happened to the homes?
Part B Design a model village that addresses the problems you identified. Consider the following questions: Does elevation play a factor? If so, can the elevation be changed to protect the homes? Could the residents build a structure that would prevent a tsunami from reaching the community? What would this structure look like? How would the residents build it? What could limit the erosion of the beach?
Part C After you design your model, build your homes and place them in the same positions as they were in task 1. Build any additional structures you think will help protect these homes. Repeat the tsunami experiment from task 1, pushing the waves three to four times.
Analyze and Extend Part A Did your results match your predictions about the additional structure protecting the homes?
Part B To prevent damage from natural hazards, scientists must consider the best ways to keep people safe while also considering practicality in terms of cost, interference of new structures in day-to-day life, and other such factors. If your plan worked, was it a practical solution for the community? Can you think of any downsides to your plan? If it didn’t work, how would you improve your plan? Can you foresee any problems with executing your plan?
Part C. 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?
Part D
The home in the picture below is from a tsunami-prone area. Based on the results of your experiment, do you think the structure of this home would protect against tsunamis? I'LL GIVE BRAINLIEST TOO.
The structure of this home would protect against tsunamis due to its height and hard structure.
Does the structure of this home would protect against tsunamis?Yes, in my opinion, the structure of this home would protect against tsunamis because of 8 foot tall wall that is present around the house. This wall is enough to protect the house from tsunamis due to its long height and hard composition.
So we can conclude that the structure of this home would protect against tsunamis due to its height and hard structure.
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Can someone help me please
Answer:D
Explanation:
Use the vertex form, y=a(x−h)2+ky=a(x-h)2+k, to determine the values of aa, hh, and kk.a=14a=14h=6h=6k=1k=1Find the vertex (h,k)(h,k).(6,1)(6,1)Find pp, the distance from the vertex to the focus.Find the distance from the vertex to a focus of the parabola by using the following formula.14a14aSubstitute the value of aa into the formula.14⋅1414⋅14Simplify.Combine 4 and 1/4 .1 /4/4Simplify by dividing numbersDivide 4 by 44.1/1Divide 1 by 1/1.Y=0 The Answer is DA sealed container can hold
0.325 L of gas at 1.00 atm
and 293 K. How many moles of gas
can the container hold?
0.216 moles of gas can the container hold if a sealed container can hold 0.325 L of gas at 1.00 atm and 293 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates 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).
PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.
Given data:
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
V=5 L
P = 1.05 atm
T = 296 K
Putting value in the given equation:
[tex]\frac{PV}{RT}=n[/tex]
[tex]n= \frac{1.05 atm\; X \;5 L}{ 0.08206 L.atm / mol K X 296 K}[/tex]
Moles = 0.216 moles
Hence, 0.216 moles of gas can the container hold if a sealed container can hold 0.325 L of gas at 1.00 atm and 293 K.
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Answer:
0.014
Explanation:
Use the formula PV=nRT; there are calculators for it online as well.
what is the approximate distance from the far edge of one lobe to the far edge of the other?
The approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.
What is distance between far edge of two lobes in solar system?
This distance measures the outer space between the edges of the two lobes in a given time.
The approximate distance from the far edge of one lobe to the far edge of the other in a solar system is about 2,100,000 light-years.
Thus, the approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.
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How many grams MnO2 are needed
to generate 126.0 g Zn(OH)2?
Zn + 2MnO₂ + H₂O → Zn(OH)2 + Mn₂O3
The mass of manganese oxide (MnO2) that is needed to generate 126.0 g Zn(OH)2 is 220.56 g.
Mass of manganese oxide needed
The mass of MnO2 that is needed to generate 126.0 g Zn(OH)2 is calculated as follows;
Zn + 2MnO₂ + H₂O → Zn(OH)2 + Mn₂O3
From the reaction above;
2(87 g/mol of MnO₂) ---------> 99.4 g/mol of Zn(OH)2
174 ---------------------> 99.4
? -------------------------> 126
= (126 x 174)/99.4
= 220.56 g
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Answer:
220.56
Explanation:
Temperature is one of the conditions that affects both physical and chemical change. Support the statement with an example.
Temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
How does temperature affect physicochemical properties?Temperature affects physical properties by increasing the motion of constituent atoms and thus altering the state of matter.
Moreover, in a chemical reaction, an increase in temperature also affects the conversion rate of a reactant to one or more products.
In conclusion, temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
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how is uranus and saturn similar
Answer:
Like Saturn, Uranus has rings and moons. But unlike Saturn — and indeed every other planet in the solar system — the ice giant is tipped on its side. In other words, rather than spinning like a top as it circles the sun, Uranus rolls around on its side.
Explanation:
Determine if the following is a compound , Element or Mixture
Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
What are Molecules ?
Molecules are the combination of two or more different atoms combine in a fixed ratio.
Molecules can be independently founded.
Atoms are always founded in combined state and does not occurs independently except rare earth elements which belongs to 18th group of periodic table.
Chemicals are taken in compound state But they undergo chemical reaction individually in molecular level.
Hence, Compound is a group of same molecules, Element is a group of same atoms and mixture is combination of two or more pure substances.
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How many grams of methane,
CH4, are produced from the
complete reaction of 5.15 moles
of carbon monoxide, CO?
CO+ 3H₂ → H₂O + CH4
[? ] g CH4
Answer:
82.606g
Explanation:
[tex]5.15mol CO* \frac{1 mol CO}{1 mol CH4} *\frac{16.04 g CH4}{1 mol CH4} =82.606g CH4[/tex]
Neither n2 nor o2 are greenhouse gases because
Neither N₂ or O₂ are greenhouses gases because they do not cause the greenhouse effect.
What are greenhouses gases?Greenhouse gases trap heat in the atmosphere causing the temperature of the planet to rise.
Greenhouse gases cause the greenhouse effect.
What is the greenhouse effect?
The greenhouse effect is the warming up of the planet due to greenhouse gases.
Greenhouse gases include
carbondioxidemethanenitrous oxide and water vapourSo, neither N₂ or O₂ are greenhouses gases because they do not cause the greenhouse effect.
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A 20.0-ml sample of glucose Iv solution has a mass of 20.6g.what is the density of the glucose
Taking into account the definition of density, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].
What is densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density of the glucoseIn this case, you know that:
Density= ?Mass= 20.6 gVolume= 20 mLReplacing in the definition of density:
[tex]density=\frac{20.6 g}{20 mL}[/tex]
Solving:
density= 1.03 [tex]\frac{g}{mL}[/tex]
In summary, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].
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What is the optimum pH of formic acid-formate buffer? (The pK, of formic acid is 3.75.)
1.875
3.75
5.625
7.50
The optimum pH of formic acid - formate buffer is 3.75
What is Buffer ?
A substance or a solution which resists any changes in pH, when acid or alkali is added to it.
pH = pKa + log[base] / [acid]
Considering equimolar concentration of acid and base
pH = 3.75 + log(x)/(x)
pH = 3.75 + log (1)
pH = 3.75 + 0
pH = 3.75
Hence,
The optimum pH of formic acid - formate buffer is 3.75
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