Question is in picture! Due in 30 minutes!
Answer:
wheresthepicture.-
Explanation:
Answer:
don't see a picture
Explanation:
PLEASE HELP ASAP!!
WHAT IS THE CYCLE OF OZONE IN THE STRATOSPHERE?
A. UV splits an oxygen molecule into two oxygen atoms, which combine with a oxygen molecule to create ozone.
B. An ozone molecule splits into an oxygen molecule and an oxygen atom.
C. An ozone molecule forms from and then splits into two oxygen molecules and two oxygen atoms.
D. A & B
URGENT: Identify the subatomic particles that determine the atomic number of an element.
Answer:
the number of protons determines the atomic number
Explanation:
Ex. Aluminum has 13 protons, so it's atomic number is 13
hope this helps :)
what is the k expression for this reaction? plz help !
Answer:
K = [HI]² / [H₂] [I₂]
Explanation:
To write the expression of equilibrium constant, K, it is important that we know how to obtain the equilibrium constant.
The equilibrium constant, K for a given reaction is simply defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient. Thus, the equilibrium constant is written as follow:
K = [Product] / [Reactant]
Now, we shall determine the equilibrium constant for the reaction given in the question above. This can be obtained as illustrated below:
H₂(g) + I₂(g) —> 2HI (g)
K = [HI]² / [H₂] [I₂]
A box is pushed at a constant speed of 1.5 m/s for 12 seconds using a force of 50 Newtons across the floor. Calculate the distance the box travelled using. *
Answer:
Distance = 18 meters
Explanation:
Given the following data;
Force = 50 N
Speed = 1.5 m/s
Time = 12 seconds
To find the distance travelled;
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
Making distance the subject of formula, we have;
Distance = speed * time
Substituting into the formula, we have;
Distance = 1.5 * 12
Distance = 18 meters
Additionally, to find the workdone;
Workdone = force * distance
Workdone = 50 * 18
Workdone = 900 Joules
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Balancing Equations help (please explain)
Answer:
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.
Explanation:
A student finds that the water's temperature went from 18oC to 38oC. Calculate how many calories are in the peanut.
Answer:
567 calories.
Explanation:
There 567 calories in 100 grams of peanut. In 100 grams of peanut, 49 gram is the fat, 26 grams of protein, 16 grams of carbohydrates, Sodium is 18 mg, Potassium is 705 mg. Calcium is present in peanut about 9%, Iron is 25% , Vitamin B-6 is 15% and Magnesium is 42% of their total weight. Oil content is high in the Peanut so this is the reason for high calories in peanut. It is a good source of proteins and potassium.
During a reaction, H for reactants is -750 kJ/mol and H for products is 920 kJ/mol. Which statement is correct about the reaction and correctly compares the energy in bonds?
Answer:
a
Explanation:
the ones are stronger and herder to break so it will take more energy to break them then when they are made
The statement, that describes the reaction and correctly compares the energy in bonds from the given ΔH values is "It's endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed."
What is ΔH?The quantity of energy evolved during a chemical reaction is represented by ΔH, also known as enthalpy change.
An exothermic reaction is a chemical reaction in which heat energy is emitted. The value of ΔH is always negative in exothermic processes. An endothermic reaction is a chemical reaction that absorbs heat energy. The value ΔH of is always positive for endothermic reactions.
When the bonds in the reactants are broken, more energy is absorbed than is released when new bonds are created in the products, therefore the value of ΔH is always positive in endothermic reactions.
Hence the correct option is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed.
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A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 - (aq) What happens if KCl is added
Answer:
pH is not been modified. No changes.
Explanation:
Our buffer is made of acetic acid, a weak one and the salt from its conjugate base, sodium acetate.
NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻
The acetate anion can make hydrolisis in water to produce acetic acid again.
C₂H₃O₂⁻ + H₂O ⇄ C₂H₃O₂H + OH⁻ Kb
KCl is neutral salt. When we dissociate it:
KCl → K⁺ + Cl⁻
Both ions come from a strong base and a strong acid. They won't make hydrolisis in water because they are conjugate weak acid and base
K⁺ + H₂O ← KOH + H⁺
Cl⁻ + H₂O ← HCl + OH⁻
These reactions can't be possible.
That's why it doesn't occur anything in our buffer, this salt does not give OH⁻ or H⁺ to medium to modify pH
which of the following examples where molecules are slightly far apart
A.rock
B.water
C.smoke
D.plasma ball
Answer:
in my opinion I think is D you don't have to choose it
Choose ALL
BIOTIC factors
Lesson 5.01
Question 1 options:
protists
animals
fungi
plants
salinity
Answer:
protists
animals
fungi
plants
Explanation:
i took the test let me know if im wrong tho
The biotic factors from the following options are protist, animals, fungi, and plants. Options A, B, c, and D are correct.
What are biotic factors?Biotic factors are those factors which can grow, and reproduce themselves.
Plants, animals, protists, and fungi are biotic factors that live, eat ad reproduce.
Salinity is the quality of any solution. It is not a biotic factor.
Thus, the correct options are A, B, c, and D.
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Anyone know this question
Which pH is the most acidic
Answers choices below
A. 7
B. 14
C. 0.5
D . 1
C. 0.5
This is the answer.
(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)
[tex]0.5[/tex]
Explanation:
As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).
Type the correct answer in the box. Express your answer to three significant figures. Iron(II) chloride and sodium carbonate react to make iron(II) carbonate and sodium chloride: FeCl2(aq) + Na2CO3(s) → FeCO3(s) + 2NaCl(aq). Given 1.24 liters of a 2.00 M solution of iron(II) chloride and unlimited sodium carbonate, how many grams of iron(II) carbonate can the reaction produce? The reaction can produce grams of iron(II) carbonate.
Answer:
The reaction can produce 287 grams of iron(II) carbonate
Explanation:
To solve this question we must find the moles of iron(II) chloride that react. Using the chemical equation we can find the moles of iron(II) carbonate and its mass -Molar mass FeCO3: 115.854g/mol-
Moles FeCl2:
1.24L * (2.00mol / L) = 2.48 moles FeCl2
As 1 mol FeCl2 produce 1 mol FeCO3, the moles of FeCO3 = 2.48 moles
Mass FeCO3:
2.48mol * (115.854g / mol) =
The reaction can produce 287 grams of iron(II) carbonateAnswer:
287
Explanation:
5) answer is A
2NaHCO3(s) + 129k) - Na2CO3(s) + H2(g) + CO2(g)
This equation indicates that AH is
and energy must be
to complete the reaction.
A)
positive; added
B)
negative; added
C)
positive; released
D)
negative; released
Answer:
A) positive; added
Explanation:
Based on the reaction:
2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)
2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.
That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.
Thus, right answer is:
A) positive; added
correct name for Ti(SO4)2?
Answer:
Titanium(IV) Sulfide
Explanation:
Which of the following is not a renewable source of energy?
1.) geothermal
2.) coal
3.) solar
4.) wind
2. Coal
It is non renewable energy source.
Answer: the answer would be coal
Explanation: hoped this helped!
PLZZ HELP WILL MARK AS BRAINLIESTTT!!!!!
Answer:
The object is moving with uniform acceleration
Explanation:
Acceleration is defined as the change of speed with time. Hence, we define acceleration as ds/dt.
The slope of a speed/time graph gives us the acceleration of the moving object.
An object is said to move with uniform acceleration when the speed increases by equal amounts in equal time intervals as in the straight line speed/time graph shown in the question
What are the two groups the animal kingdom is divided into?
Answer:
Taking the animal kingdom as an example, we can see that it is split into two clear groups: Invertebrates - animals without a backbone. Vertebrates - animals with a backbone.
Explanation:
Given the following electronic configurations, identify how many valence electrons each atom has.
A=
Element
Electron Configuration
Number
of
Valence
Electrons
B =
C=
Sodium
(Na)
152 2s 2p 3s
А
DONE
Oxygen (0)
1s 2s 2p
B
Iron (Fe)
1s 2s 2p 3s 3p 452
306
С
Answer:
sodium=atomic number 11 it electronic configuration is ,K=2, L=8,M=1 Valence is 1
oxygen= atomic number 8 it electronic configuration is K=2, L=6 Valence is 2
iron= atomic number 26 it electronic configuration is K= 2 L= 8,M=8 N=6 Valence 2
Answer: A=1
B=6
C=8
Explanation:
You will be marked as brainlest if you are able to solve this question
Answer:
See Explanation
Explanation:
1) According to the question, the reactivity of a metal is measured by the temperature of the solution after reaction. The higher the temperature of the solution, the greater the reactivity of the metal. Based on this criterion, the metals can be arranged in an order of reactivity as follows;
Mg> Zn > Fe.
2) The equation of the reaction is;
Mg(s) + 2H^+(aq) ------>Mg^2+(aq) + H2(g)
If we consider the changes in oxidation number from left to right;
The oxidation number of Mg changed from zero to +2
The oxidation number of H changed from +1 to zero
Recall that a redox reaction is a reaction in which the oxidation number of species changes from left to right in the reaction. Hence this reaction is a redox reaction.
The reducing agent experiences an increase in oxidation number. In this case, Mg is the reducing agent.
The oxidation half equation is;
Mg(s) ------> Mg^2+(aq) + 2e
The reduction half equation is;
2H^+(aq) + 2e ------> H2(g)
Your simulation involved 100 atoms and eight half-life cycles. For half-life cycles 9 and later, how many radioactive nuclei would you expect to be present?
Answer:
you would expect 0 radioactive nuclei to be present
Explanation:
got it right on the assignment
Most types of commercial flour are sifted
before they are packaged and sold in the
store. What effect do you think this has
on the quality of the flour?
Answer:
It improves the texture of the flour
Explanation:
Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.
Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.
Which of the following lists describes characteristics of an acid?
Answer: Acids have a sour taste. Lemons, vinegar, and sour candies all contain acids. Acids change the color of certain acid-base indicators. Two common indicators are litmus and phenolphthalein. This are som Characteristics of acid.
Answer:
Sour tasteCorrosive (burn your skin and break down other materials)Increase the concentration of H+ when added to waterDissolve metalsDonate a hydrogen ionlow pHExplanation:
these are the characteristics of an acid.
hope this helps!
What is the mass of 2.053 moles of silver nitrate?
Answer:
Explanation:
Silver nitrate grams to moles
1 grams Silver Nitrate is equal to 0.0058867472248402 mole
Consider the following reaction: 2 SO2(g) + O2(g) → 2SO3(g)
If the initial rate of change for sulfur dioxide is -2.00 M/min, what is the initial rate of change of oxygen?
A) -4.00 M/min
B) -1.00 M/min
C) 4.00 M/min
D) 1.00 M/min
Answer:
B) -1.00 M/min
Explanation:
Based on the reaction:
2 SO2(g) + O2(g) → 2SO3(g)
2 moles of SO2 are consumed per mole of O2 producing 2 moles SO3
In the problem, the sulfur dioxide has a rate of change of -2.00M/min. As the moles of oxygen that reacted are half the moles of SO2, its rate of change is halved, that is:
B) -1.00 M/minThe student then takes a 1.00M stock solution of table sugar (sucrose C12H22O11) and mixes 0.305L of stock solution with additional distilled water to create a dilute solution with a total volume of 1.25L.
Explain how the student can determine the molarity of the resulting solution. Show a valid calculation for the final molarity. PLS HELP
Answer: The molarity of final solution is 0.244 M.
Explanation:
Given: [tex]M_{1}[/tex] = 1.00 M, [tex]V_{1}[/tex] = 0.305 L
[tex]M_{2}[/tex] = ?, [tex]V_{2}[/tex] = 1.25 L
Formula used to calculate the molarity f resulting solution is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\1.00 M \times 0.305 L = M_{2} \times 1.25 L\\M_{2} = \frac{1.00 M \times 0.305 L}{1.25 L}\\= 0.244 M[/tex]
Thus, we can conclude that the molarity of final solution is 0.244 M.
Which of the following best explains the relationship between peak to peak amplitude and semi amplitude
Answer:
Which of the following best explains the relationship between peak-to-peak amplitude and semi-amplitude? Semi-amplitude is half the distance of the peak-to-peak amplitude. Semi-amplitude is the same distance as the peak-to-peak amplitude.
What is the role of a consumer in the flow of energy through a food chain?
Answer:
The role of consumers in an ecosystem is to obtain energy by feeding on other organisms and sometimes transfer energy to other consumers. Changes that affect consumers can impact other organisms within the ecosystem.
Explanation:
Hope this helped Mark BRAINLIEST!!!!
Consumers are organisms that obtain energy by eating other organisms. Consumers may consume either producers or other consumers. Consumers include animals.
What is food chain ?A food chain is a network of links in a food web that begins with producer organisms and ends with an apex predator, detritivore, or decomposer species.
A food chain also demonstrates how organisms are related to one another through the food they consume. Each trophic level is represented by a different level of a food chain.
Producers can produce their own food and energy, but consumers are not the same. Consumers are living things that must hunt, gather, and eat their food.
Thus, Consumers must eat in order to gain energy, or they will perish. Omnivores, carnivores, herbivores, and decomposers are the four types of consumers.
To learn more about the food chain, follow the link;
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