An empirical formula is the chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms.
For example the molecule 'CH2O' is the empirical formula for glucose.
HELP ME PLZZZZ ASAP
Which statements describe asexual and sexual reproduction? Check all that apply.
1. Sexual reproduction always requires two parents.
2. Methods of asexual reproduction are forms of meiosis.
3. Asexual reproduction requires only one parent.
4. In sexual reproduction, offspring receives all of its DNA from one parent.
5. The offspring of sexual reproduction have the same DNA as the parent.
Answer:
1. Sexual reproduction always requires two parents.
3. Asexual reproduction requires only one parent.
Explanation:
The statement which clearly distinguish two types of reproduction is option 1. Sexual reproduction always require two parents whereas, asexual reproduction.
What is asexual reproduction ?Asexual reproduction refers to a type of reproduction where a child is born to a single parent. The newly created people are clones of their parents since they have the same genetic makeup and physical characteristics.
Both multicellular and unicellular species can reproduce asexually. There will be no gamete fusion involved in this procedure, and the number of chromosomes will remain the same.
Sexual reproduction always requires two parents. The genetic traits from both parents are inherited to the offsprings. However , not all of them can be active traits some goes hidden. Hence, option 1 is correct.
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What are the 7 sources of energy?
The answer is Solar, Wind, Geothermal, Hydrogen, Tidal, Wave, Hydroelectric, Biomass Energy.
Final answer:
The seven sources of energy are food, geothermal energy, tidal energy, solar energy, biomass energy, fossil fuels, and nuclear energy.
Explanation:
Sources of Energy
Food: In living organisms, the source of energy is the food they consume.
Geothermal energy: This energy comes from the earth's core.
Tidal energy: Generated by the gravitational pull of the moon and sun.
Solar energy: Produced by the sun's light and is responsible for wind, the water cycle, and photosynthesis.
Biomass energy: Created by plants, algae, and cyanobacteria utilizing solar energy through photosynthesis. Biomass can be burned for biofuels.
Fossil fuels: Formed from ancient biomass over millions of years. Includes coal, oil, and natural gas.
Nuclear energy: Generated through nuclear reactions, such as those in the sun and nuclear power plants.
Can anyone help me out please?
Answer:
Qustion 7:
Answer is → "c. Calcium ions and sulfate ions join together to form an insoluble compound"
Question 8:
Answer is → b. ²³⁹Pa
Question 9:
Answer is → "c. 1/3 the pressure in container B"
Explanation:
=================================================================
Qustion 7:
from the graph:
a. precipitation reactions only occur when solution temperature are decreased.
this option is wrong due to precipitation reaction can occur at room temperature or even at elevated temperature.
b. Sodium ions and chloride ions repel each other when they are in a solution.
Also, this is a wrong statement because sodium ions is positively charged and attract the negatively charged chloride ions.
d. the creation of precipitate adds mass that was previously non-existent.
From graph it is clear that the mass doesn't changed before and after the reaction remain constant (=300.23 g).
So, the right answer is
→ "c. Calcium ions and sulfate ions join together to form an insoluble compound"
=================================================================
Question 8:
According to the equation :
²³⁹U → ________+ ₋₁⁰euranium(239) loses a beta particle and so the mass numer will not change ( remains 239).So, the right answer is
→ b. ²³⁹Pa
=================================================================
Question 9:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of P and V:
Pₐ * Vₐ= P(b) *V(b)
from the graph:
Vₐ= 9.0 L.
V(b)= 3.0 L.
∴ Pₐ = [P(b) * V(b)] / Vₐ = [P(b) * 3.0 L] / 9.0 L = 1/3 P(b).
So, the right choice is:
Answer is → "c. 1/3 the pressure in container B"
=================================================================
What is the reaction quotient?
A.It measures the [products] / [reactants]
B.It measures the concentration of the reactants.
C.It measures the concentration of the products.
D.It measures the [reactants] / [products]
Reset
Answer:
A. It measures the [products] / [reactants].
Explanation:
The reaction quotient aids in figuring out which direction a reaction is likely to proceed, given either the pressures or the concentrations of the reactants and the products.It is calculated from the concentration of the products and reactants at mixing up.Reaction quotient (Q) = [products] / [reactants]So, the right choice answer:
A. It measures the [products] / [reactants].
What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?
Answer:
[H⁺] = 5.012 x 10⁻⁹. & [OH⁻] = 1.995 x 10⁻⁶.
Explanation:
∵ pH = - log[H⁺]
8.3 = - log[H⁺]
∴ log[H⁺] = - 8.3.
∴ [H⁺] = 5.012 x 10⁻⁹.
∵ [H⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H⁺] = 10⁻¹⁴/(5.012 x 10⁻⁹) = 1.995 x 10⁻⁶.
Answer:
The correct answer is C.
Explanation:
I just got it correct on the test. I hope this helps!
Convert a pressure of 1.75 atm to kPa and to mm Hg
Answer:
Explanation:
1.75atm x 101.3kPa/1 atm
=177kPa
1.75 atm x 760 mmHg/1 atm
=1300 mm Hg
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
The correct answer is 1300mmhg
What is pressure?Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure. Various units are used to express pressure.According to the question, the formula is used as
[tex]1.75* 101.3[/tex] =177kPa
1.75 * 760=1300 mm Hg
Hence, the correct answer is 1300mmhg.
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How much energy would a jeweler need to melt 4.4 g of copper to fix a broken necklace if the copper starts out at 25°C and melts at 1083°C
Answer:
1792 J.
Explanation:
To calculate the energy would a jeweler need, we use the relation:The amount of heat released from Cu = Q = m.c.ΔT.
where, m is the mass of Cu (m = 4.4 g).
c is the specific heat capacity of Cu = 0.385 J/g°C.
ΔT is the temperature difference = (final T - initial T = 1083°C - 25°C = 1058°C).
∴ The amount of heat released from Cu = Q = m.c.ΔT = (4.4 g)(0.385 J/g°C)(1058°C) = 1792 J.
average speed is ___.
a) a vector
b) the distance traveled divided by the time to travel that distance
c) measured in m/s
d) the slope of a velocity vs. time graph
I believe that the correct answer is choice B
Igneous rocks formed below earths surface
A) igneous rocks
B) extrusive
C) intrusive
D) lava
Answer:
The answer is C. Instrusive
Explanation:
The ingneas rocks are those that form when the magma cools and reaches a solid state. When this type of volcanic rock cooling occurs below the surface of the earth's crust, it is known as intrusive rocks. This type of igneous rock is formed from the magma that has solidified, creating crystals.
Igneous rocks formed below earths surface C) intrusive.
Igneous rocks are classified based on their origin and formation process. They are formed from the solidification of molten material, known as magma or lava. When magma cools and solidifies beneath the Earth's surface, it forms intrusive igneous rocks.
Intrusive igneous rocks are characterized by their formation within the Earth's crust. The magma, which is molten rock, rises to the surface and gets trapped in underground chambers called magma chambers. As the magma cools slowly over time, the minerals within it crystallize and solidify to form intrusive igneous rocks.
The slow cooling process of the magma beneath the Earth's surface allows for the growth of large mineral crystals. The resulting rocks have a coarse-grained texture due to the visible crystals. Examples of intrusive igneous rocks include granite, diorite, and gabbro.
On the other hand, extrusive igneous rocks are formed from lava that erupts onto the Earth's surface and cools quickly. The rapid cooling prevents the growth of large crystals, resulting in a fine-grained or glassy texture. Examples of extrusive igneous rocks include basalt, andesite, and obsidian.
Therefore, the correct answer is C) intrusive, as it refers to igneous rocks formed below the Earth's surface through slow cooling of magma.
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a 49.2 g sample of solid iron was heated from 16.2c to 58.9c.what ws the energy change?solve for q(heat energy).iron has a specific heat value of .4494
Answer:
944.12 J
Explanation:
To solve for the energy change we use the equation Q=mc(Delta)t
Let's identify the variables we have:
m (mass) = 49.2 g
c (specific heat) = .4494
delta t (change in temp.) = final - initial = 58.9-16.2 = 42.7 degrees Celsius
Q= (49.2)(.4494)(42.7)
= 944.12 J
which of the following would improve the experimental design of this investigation? why?
safety goggles
root vegetable, such as a large carrot or potato
two metal forks
an edge or thin wall to freely balance the vegetable on, such as a cardboard box with its flaps taped down
Stay safe! Always wear your safety goggles. Be careful while sticking the forks into the vegetable. If you’re working outside a lab, make sure the area is clean so you can save the vegetable when you’re done.
Part A
Stick a fork into each end of
4. How is photosynthesis a carbon storing process?
Carbon dioxide (CO2) in the atmosphere is necessary for plants and trees to grow. Forests play a specific and important role in the global carbon cycle by absorbingcarbon dioxide duringphotosynthesis, storing carbonabove- and belowground, and producing oxygen as a by-product of photosynthesis.
Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into energy-storing carbohydrates and oxygen. This allows plants to store carbon in the form of glucose for growth and energy reserves, effectively removing carbon dioxide from the atmosphere.
Photosynthesis is a carbon storing process because it converts carbon dioxide from the atmosphere into energy-storing carbohydrates, such as glucose, which plants can then store for later use. The general equation for photosynthesis is:
6CO₂ + 6H₂O + light energy \rightarrow C₆H₁₂O₆ + 6O₂
During this process, solar energy is harnessed through the chloroplasts in the leaves of plants, initiating a series of reactions known as the Calvin cycle. These reactions convert atmospheric carbon dioxide and water in the presence of sunlight into glucose, which plants use to grow and thrive, or store for later energy needs. For example, sweet potatoes store carbohydrates in their roots, while aloe plants store them in their leaves, making these biological reserves an important aspect for both the plants and the ecosystems they support.
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Question 1 (1 point)
Saved
In the first reaction with Epsom Salt added to ammonia, what evidence was there for a chemical reaction taking place?
Question 1 options:
color change
formation of a precipitate
increase in temperature
formation of bubbles
Question 2 (1 point)
In the second reaction with iron and oxygen, what evidence for a chemical reaction was NOT observed?
Question 2 options:
new substance formed
formation of a precipitate
color change
change in temperature
Question 3 (1 point)
In the third reaction which gas is released when baking soda is added to vinegar?
Question 3 options:
carbon dioxide
hydrogen gas
water
oxygen
Question 4 (1 point)
In the fourth reaction with copper sulfate and sodium hydroxide, what is the precipitate that is formed?
Question 4 options:
Cu(OH)2
NaOH
CuSO4
Na2SO4
Answer: Question #1) The formation of a precipitate
Question # 2) ? Insufficient information
Question # 3) when you mix baking soda (sodium bicarbonate) with vinegar (acetic acid) the baking soda is the base and the vinegar is the acid, the baking soda takes a proton from the acid and the products of the reaction are H2O and CO2. The initial two products are carbonic acid and sodium acetate and the second part of the reaction is the decomposition reaction with the carbonic acid immediately decomposing into water and carbon dioxide gas. The CO2 rises to the surface creating bubbles.
Question #4) when sodium hydroxide, a strong base reacts with copper sulfate an acidic salt as a blue precipitate of copper hydroxide is produced with ions of sodium sulfate in solution. This represents a double displacement reaction as well as a precipitation reaction.
Explanation:
Pick the correct answer down below
The correct answer is A I believe!
the correct answer is d)
The pressure exerted on a sample of gas is 735 mm Hg with a volume of 375 mL and a temperature of 25 degrees Celsius. What would the pressure of the gas be if the temperature was reduced to standard temperature and the volume was expanded to 500.0 mL?
Answer:
= 498.13 mmHg
Explanation:
Using the combined gas law;
P1V1/T1 =P2V2/T2
in this case; P1 = 725 mmHg, V1 = 375 mL and T1 = 25°C + 273 = 298 K
P2 = ? V2 = 500 mL and T2 = 0°C + 273 = 273 K
P2 = P1V1T2/T1V2
= (725 × 375 × 273)/(298 × 500)
= 498.13 mmHg
How does a catalyst increase the rate of a reaction?
A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.
Answer: The answer would be C. Please give me a thanks :) bye!
Explanation:
Answer: C) It provides a lower activation energy for the reaction.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
hich statement is true? A. An acid with a large pKa will be a better conductor of electricity than one with a smaller pKa. B. An acid with a large pKa will be less corrosive than one with a smaller pKa. C. An acid with a large Ka will be a poorer conductor of electricity than one with a smaller Ka. D. An acid with a large Ka will be less corrosive than one with a smaller Ka. E. An acid with a large Ka will taste less sour than an acid with a smaller pKa.
Answer:
[tex]\boxed{\text{B is correct}}[/tex]
Explanation:
Kₐ and pKₐ are measures of the strength of an acid. For example,
HX + H₂O ⇌ H₃O⁺ + X⁻; Kₐ = 10¹⁰, pKₐ = -10
HA + H₂O ⇌ H₃O⁺ + A⁻; Kₐ = 10⁻¹⁰, pKₐ = 10
HX is a strong acid, because it has a larger Kₐ, that is, the position of equilibrium lies far to the right.
However, pKₐ is the negative logarithm of Kₐ, so HX has the smaller pKₐ.
Similarly, Ha is a weak acid, but it has the larger pKₐ.
Strong acid: Large Kₐ ⇔ Low pKₐ
Weak acid: Small Kₐ ⇔ High pKₐ
A is wrong. HA is a weak acid, so it produces only a few hydronium ions.
B is correct. The rate of corrosion depends on the concentration of hydronium ions. HA is a weak acid, so it is less corrosive than an acid with a small pKₐ.
C is wrong. HX is a strong acid, so there are more ions to carry the current. HX will be a good conductor of electricity.
D is wrong. HX is a strong acid, so it provides more hydronium ions and is more corrosive.
E is wrong. HX is a strong acid, so it provides more hydronium ions to stimulate the taste buds.
[tex]\boxed{\textbf{B is correct}}[/tex]
Disorders, such as sickle cell anemia, are the result of mutations of theA)brain.B)chromosomes.C)heart.D)nucleolus.
Answer:
B)
Explanation:
Mutations are changing in chromosomes.
If you have 3.00 of N2, how many moles of NH3 will be produced?
Answer:
4.50
Explanation:
3.00+1.50
Which is a characteristic of glacial movement?
A. The zone of wastage is at the top of the glacier.
B. Movement depends on the balance between accumulation and wastage.
C. New snowfall accumulates in a zone at the bottom of the glacier.
Answer:
(B) Movement depends on the balance between accumulation and wastage.
Explanation:
A Glacier is accumulation of snow over a particular region over many years. It is balanced by zone of accumulation and zone of wastage. The zone of accumulation is the top of the glacier where the snow or ice accumulates whereas the zone of wastage is the bottom region of the glacier which melts slowly over time. A glacier sustains if the zone of accumulation is greater than the zone of wastage.
Glacial movement is determined by the balance between accumulation and wastage.
Explanation:Glacial movement is characterized by the balance between accumulation and wastage. The movement of a glacier depends on the amount of snow and ice being added through accumulation compared to the amount being lost through wastage. New snowfall accumulates zone of accumulation at the top of the glacier, while the zone of wastage is at the bottom where ice melts and breaks off. Therefore, the correct option is B. Movement depends on the balance between accumulation and wastage.
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What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g) Reaction B: 2H2(g) + O2(g) → 2H2O(g) + energy A. Reactions A and B are both exothermic. B. Reaction A is endothermic, and reaction B is exothermic. C. Reactions A and B are both endothermic. D. Reaction A is exothermic, and reaction B is endothermic.
Answer:
The correct answer is B: reaction A is endothermic and reaction B is exothermic.
Explanation:
A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g): is the photosynthesis reaction. Photosynthesis is an endothermic reaction, therefore it needs energy (sunlight) to take place.
B: 2H2(g) + O2(g) → 2H2O(g) + energy: is the formation of water. It is an exothermic reaction which releases energy as a result of the reaction.
So, the answer is option (B): Reaction A is Endothermic and Reaction B is Exothermic.
Answer: Answer: B. Reaction A is endothermic, and reaction B is exothermic
Explanation:
Endothermic reaction is a reaction that absorb energy from its surrounding.
Reaction A : 6H2O(l) + sunlight
Exothermic reaction is a reaction that releases energy to the surrounding.
Reaction B → 2H2O(g) + energy
Which indicator most likely suggests that a chemical change is taking place? 1)change in size 2)change of color 3)change of state 4)change in shape
Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change. you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction
The correct answer is 2) change of color
Explanation:
A chemical change occurs when a new substance is formed or the original substance changes its identity and composition due to a chemical reaction. This is the opposite of a physical change that modifies only physical properties such as state or shape. Moreover, a chemical reaction can be identified because if often leads to a change in color, odor, the formation of bubbles or temperature change. This implies the only one that suggests a chemical change is a change of color because this occurs if the composition of a substance or substances change.
what are the names of the major groups that settled the islands of Oceania south
choose all answers that are correct.
A. South Americans
B. Filipinos
C. Aboriginals and Maori
D. Indonesians
Answer:
i think it's B, C and D
Explanation:
Why is it so easy for magnesium atom to lose two electrons ?
Answer: Atoms want to be like a "noble gas" with a filled outer shell. I think it has to do with being in a stable state. For Mg, it's a lot easier to drop 2 electons to look like Ne rather than gain 6 to look like Argon.
therefore ,by electric configuration we get
=2,8,2As the no. of atoms is less than 5 it is easy to lose from gaining as it took some more difficulties!!!
hope its help!!✌✌✌✌✌
Find out Oxidizing and Reducing agent in the following REDBOX REACTIONS.
Answer:
Fe is the reducing agent while oxygen is the oxidizing agent
Explanation:
In the reaction above Iron loses electrons to form iron ions and this is called oxidation. Therefore, iron is the reducing agent which loses electrons and becomes oxidized to form Iron(iii) ion.On the other hand, Oxygen gains or accepts electrons and therefore, it undergoes reduction. This means oxygen is the reducing agent that accepts electrons and becomes reduced to oxygen ion.Matter changes from one state to another when ____________ is added or removed.
Answer:
Heat
Explanation: When matter is heated enough, the molecules move faster and with greater energy. If enough heat is added, a solid can become liquid and a liquid can become gas. In the same way, molecules slow down when they are cooled.
thermal energy (heat) is added or removed
How would a collapsing universe affect light emitted from clusters and superclusters? A. Light would acquire a blueshift. B. Light wouldn't be affected. C. Light would acquire a redshift. D. Light can't be measured from clusters and superclusters.
Answer:
Choice A: Light would acquire a blueshift.
Explanation:
When a universe collapses, clusters of stars start to move towards each other. There are two ways to explain why light from these stars will acquire a blueshift.
Stars move toward each other; Frequency increases due to Doppler's Effect.
The time period [tex]t[/tex] of a beam of light is the same as the time between two consecutive peaks. If [tex]\lambda[/tex] is the wavelength of the beam, and both the source and observer are static, the time period [tex]T[/tex] will be the same as the time it takes for light travel the distance of one [tex]\lambda[/tex] (at the speed of light in vacuum, [tex]c[/tex]).
[tex]\displaystyle t = \frac{\lambda}{c}[/tex].
Frequency [tex]f[/tex] is the reciprocal of time period. Therefore
[tex]\displaystyle f = \frac{1}{t} = \frac{c}{\lambda}[/tex].
Light travels in vacuum at a constant speed. However, in a collapsing universe, the star that emit the light keeps moving towards the observer. Let the distance between the star and the observer be [tex]d[/tex] when the star sent the first peak.
Distance from the star when the first peak is sent: [tex]d[/tex].Time taken for the first peak to arrive: [tex]\displaystyle t_1 =\frac{d}{c}[/tex].The star will emit its second peak after a time of. Meanwhile, the distance between the star and the observer keeps decreasing. Let [tex]v[/tex] be the speed at which the star approaches the observer. The star will travel a distance of [tex]v\cdot t[/tex] before sending the second peak.
Distance from the star when the second peak is sent: [tex]d - v\cdot t[/tex].Time taken for the second peak to arrive: [tex]\displaystyle t_2 =t + \frac{d - v\cdot t}{c}[/tex].The period of the light is [tex]t[/tex] when emitted from the star. However, the period will appear to be shorter than [tex]t[/tex] for the observer. The time period will appear to be:
[tex]\begin{aligned}\displaystyle t' &= t_2 - t_1\\ &= t + \frac{d - v\cdot t}{c} - \frac{d}{c}\\&= t + (\frac{d}{c} - \frac{v\cdot t}{c}) -\frac{d}{c}\\&= t - \frac{v\cdot t}{c} \end{aligned}[/tex].
The apparent time period [tex]t'[/tex] is smaller than the initial time period, [tex]t[/tex]. Again, the frequency of a beam of light is inversely proportional to its period. A smaller time period means a higher frequency. Colors at the high-frequency end of the visible spectrum are blue and violet. The color of the beam of light will shift towards the blue end of the spectrum when observed than when emitted. In other words, a collapsing universe will cause a blueshift on light from distant stars.
The Space Fabric Shrinks; Wavelength decreases as the space is compressed.
When the universe collapses, one possibility is that clusters of stars move towards each other. Alternatively, the space fabric might shrink, which will also bring the clusters toward each other.
It takes time for light from a distant cluster to reach an observer on the ground. The space fabric keeps shrinking while the beam of light makes its way through the space. The wavelength of the beam will shrink at the same rate. The wavelength of the beam of light will be shorter by the time the beam arrives at its destination.
Colors at the short-wavelength end of the visible spectrum are blue and violet. Again, the color of the light will shift towards the blue end of the spectrum. The conclusion will be the same: a collapsing universe will cause a blueshift on light from distant stars.
Answer:
Light would acquire a blueshift.
Explanation:
Just took the test and got it right.
5.01 moles of magnesium phosphate contain how many atoms of phosphorus?
Answer:
Explanation:
Deal with 1 mole first.
The chemical formula of Magnesium Phosphate is
Mg3(PO4)2
The 2 tells you that there are 2 mols of Phosphorus in the chemical.
1 mol of anything is 6.02 * 10^23 (in this case) atoms.
2 mols of anything is 12.04 * 10^23 atoms
2 moles of anything is 1.204 * 10^24 (the 2 answers are the same. This one is more correct in scientific notation.)
Now we come to the 5.01. Where does that go?
5.01 * Mg3(PO4)2
So multiply 1.204 * 10^24 by 5.01 When you do, you get
7.26 * 10^24 atoms
PLEASE HELP!!!!!!!!Which of the following chemical reactions is best clasified as an acid-base reaction?
a
2HgO→2Hg + O2
b
Na2SO4 + BaCl2 →BaSO4 + 2NaCl
c
Zn + 2AgNO3 →Zn(NO3)2 + 2Ag
d
H2SO4 +2KOH →K2SO4 + 2H2O
Answer:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Explanation:
The given reactions are:a . 2HgO → 2Hg + O₂,
It is a decomposition reaction, that HgO is decomposed to give Hg and O.
b . Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl,
It is a double replacement reaction where two salts replaces their cations and anions with each others producing 2 new salts.
c . Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag,
It is a single replacement reaction, that Zn replaces Ag from its salt.
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
It is acid-base reaction "neutralization reaction" where H₂SO₄ (acid) reacts with KOH (base) producing K₂SO₄ (salt) and water.
So, the right choice is:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
What is the pOH of 5.92x10 -2
Answer: 1.23
Explanation: Given that there is no reaction, I will assume that the molarity corresponds to that of a base.
Therefore,
All you have to do is take the negative logarithm of that molarity
Indeed, pOH = -log(5.92x10^-2) = 1.2277 = 1.23
Note:
We could also do this for the pH.
If we were finding the pH, and that we are given the molarity (also known as [OH-]), then, we would also use the negative logarithm (-log (molarity)).
If we wanted to do the opposite, we could find the molarity with the pOH using the inverse logarithm.
10^(-1.2277) = 5.92 x 10^-2