Molar mass of NaCl:-
23+35.558.5g/molNow
Mass=Molar mass ×MolesMass=125(58.5)Mass=7312.5gjust pick the right option
Answer:
A
Explanation:
As CO₂ (carbon dioxide) depends on the air temperature, it is the dependent variableTherefore, air temperature is the independent variableThis is about the relation between carbon dioxide and air temperature, so the soil surface is not a variable to be consideredWhat component of the human epidermis functions to make the skin's surface extremely tough and resistant to bacterial enzymes?
keratin
proteases
dermis
hypodermis
Answer:
Keratin :)
Explanation:
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(40) If a hypothesis is proven correct, a theory is formulated.
True or false
Answer:
In scientific reasoning, a hypothesis is constructed before any applicable research has been done. A theory, on the other hand, is supported by evidence: it's a principle formed as an attempt to explain things that have already been substantiated by data.
Explanation:
What type of galaxy is most common?
Elliptical
Irregular
Lens
Spiral
Predict the species that will be reduced first if a mixture of molten salts containing the following ions undergoes electrolysis:
Zn2+, Mn2+, Na+, Al3+, Li+
Hint! You may need to consult the table of Standard Reduction Potential on the data sheet.
Answer: Zn2+
Explanation:
The standard reduction potential of the given species is as follows:-
[tex]\begin{aligned}&Z_{(aq)}^{2+}+2 e^{-} \longrightarrow {Zn}(\mathrm{s}) \quad E^{\circ}=-0.76 \mathrm{~V}\\&\mathrm{Mn}_{(\text {aq) }}^{2+}+2 e^{-} \longrightarrow \mathrm{Mn}(\mathrm{s}) \quad E^{\circ} = -1.03 \mathrm{~V}\\&\mathrm{Na}^{+}_{(\text {aq) }} + e^{-} \longrightarrow \mathrm{Na}\text{(s)} \quad E^{\circ}=-2.71 \mathrm{~V}\end{aligned}[/tex]
[tex]\begin{aligned}&\mathrm{Al}_{(\text {aq) }}^{3+}+3 e^{-} \longrightarrow \text {Al}\text{(s)}\quad E^{0}=-1.66 \mathrm{~V}\\&\mathrm{Li}^{+}(aq)+{e}^{-} \longrightarrow \mathrm{Li}\text{(s)} \quad E^{0}=-3.05 \mathrm{~V}\end{aligned}[/tex]
In the electrochemical series, the species having the lowest electromotive force—the lowest negative value—will be reduced first and the species having the highest negative value will be reduced last
Therefore, Zn2+ will be reduced first and Li+ will be reduced last
The reduction has been defined as the loss of electrons. The species of molten salt that reduces first has been zinc ion in electrolysis.
What is electrolysis?The electrolysis has been defined as the process of the ionization of the salt under the influence of the electric field.
The species with the lowest reduction potential will reduce first. The reduction potential of the following is:
Zinc ion = -0.76 VManganese ion = -1.03 VSodium ion = -2.71 VAluminum ion = -1.66 VLithium-ion = -3.05 VZinc has the lowest reduction potential and thus is the reduced first among the others.
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A compound contains only aluminum and carbon. 0.03 moles of this compound reacted with excess water to form 0.12 moles of AI(OH)3 and 0.09 moles of CH4 write a balanced equation for this reaction.
Explanation:
4Al+3C+H2O→4Al(OH)3+3CH4
Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4
giving brainliest please help!
Answer:
I am sure it is the reaction will shift right towards the
product
A teacher drops a bottle containing sodium chloride. The bottle breaks when it
hits the floor. The teacher sweeps up the mixture of sodium chloride and glass.
Describe how the teacher can obtain a pure, dry sample of sodium chloride from
the mixture.
The mixture of sodium chloride and broken glasses can be separated by dissolution, filtration, and evaporation respectively.
Separation of mixtureThe mixture containing sodium chloride and broken glasses can be separated as follos:
First, by dissolving the mixture in water. The soluble sodium chloride will dissolve while the broken glasses will remain insoluble.Filteration is carried out to filter off the broken glassesThe filtrate which is now a mixture of water and sodium chloride can then be heated to evaporate off the water and to obtain dry sodium chloride.More on separating mixtures can be found here: https://brainly.com/question/863988
The half-life of cobalt-60 is 5 years. How old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?.
[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]
Nt/No = 1/8
T = duration of decay
t 1/2 = half-life
[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]
How long would it take for a sound impulse to travel through an aluminum rod 1,500 meters long?
0.45 sec
4.5 sec
3.4 sec
0.29 sec
Answer:
As per Provided Information
Distance travelled by sound impulse through an aluminium rod is 1500 metres .
We have been asked to determine the time taken by the sound impulse to travel through aluminium rod .
As we know
Speed of sound in aluminium rod is 5100m/s .
Using Formulae
[tex] \boxed{\bf \: Time \: taken_{(Sound \: impulse)} = \cfrac{distance \: travelled \: by \: sound \: impulse}{speed \: of \: sound \: impluse}}[/tex]
Substituting the value and we obtain
[tex] \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = \cancel\dfrac{1500}{5100} \\ \\ \\ \sf \qquad \longrightarrow \: Time \: taken_{(Sound \: impulse)} = 0.29 \: s[/tex]
Therefore ,
0.29 second sound impulse takes to travelled.So, your answer is 0.29 s .
5
Julia made a model of a cell in a clear plastic zipper bag. She used a marble for the nucleus and pinto beans for mitochondria.
Which of the following options would be best for making her model more like a plant cell?
A. Take the marble out of the bag.
B. Put the bag inside a clear plastic box.
c. Take the pinto beans out of the bag.
D. Put the bag inside a larger clear plastic bag.
Reset
Submit
The option that would be best for making Julia model look more like a plant cell is putting the bag inside a larger clear plastic bag.
What is a cell?A cell is the basic and functional unit of life. Every living organism is made up of one or more cells.
However, a plant cell is morphologically different from an animal cell. One of the major differences is that a plant cell posseses a cell wall that protects the cell.
According to this question, Julia made a model of a cell in a clear plastic zipper bag. She used a marble for the nucleus and pinto beans for mitochondria.
Therefore, the option that would be best for making Julia model look more like a plant cell is putting the bag inside a larger clear plastic bag which will represent the cell wall.
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Pls help with question 10
Answer:
Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)
Explanation:
Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g
Given equation n=m/M ,
n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles
∴ x=0.318520677 moles
∴ Molecular mass (hydrated sodium sulfate) =
= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]
= 147.77415g/mol
Answer:
Answer is in the attachment:
x=10
Explanation:
how many grams of hno3 would you need to prepare 5.5 l of this solution
8305 grams of HNO3 would be needed to prepare 5.5L of a solution. Details on how to calculate mass is found below.
How to calculate mass?The mass of a substance in a solution can be calculated using the following formula:
Density = mass ÷ volume
According to this question, 5.5L of a HNO3 solution is given.
Density of HNO3 is 1.51 g/cm³
Volume of HNO3 = 5500mL
1.51 = mass/5500
mass = 8305g
Therefore, 8305 grams of HNO3 would be needed to prepare 5.5L of a solution.
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What can you infer about magnetic domains from the fact that they are arrangements of atoms?.
Explanation:
Q. What can you infer about magnetic domains from the fact that they are arrangements of atoms? The individual domains are extremely small.
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them.An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.State the functional groups that undergo cracking and substitution reaction.
Unsaturated organic compounds with a carbon-to-carbon double bond and alkynes with a carbon-to-carbon triple bond, as well as aldehydes and ketones with a carbon-to-oxygen double bond, undergo addition reactions.
While on the scene of a very large explosion, you realize that you and your colleagues require additional wire mesh screens to collect evidence. What are you most likely sifting through?
A. Liquid found at the crime scene
B. Debris found at the crime scene
C. Dirt from footprints found at the crime scene
D. Vapors from the explosion
The individual is most likely sifting through the debris which is found at the crime scene.
What is Debris?This is defined as the scattered remains of something which has been broken down as a result of incidents such as an explosion.
The wire mesh is used as it helps to remove long fibers present at the crime scene which is taken for investigation.
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(Science)
(Quarter 4)
Solve the puzzle game's to have 5 point's
(BEGIN)
( •O•)!?
| |
| |
| |______|________
|________|_____ |
| |
(FINISH)
(real question)
can you know why Sam is nosebleeding
_ ~
(> ㅍuㅍ)>
Explanation:
because of blood pressure
explain any four effects caused due to exercise use chemical of chemical feritilizer on environment
Excessive use of chemical fertilizers has led to several issues such as serious soil degradation, nitrogen leaching, soil compaction, reduction in soil organic matter, and loss of soil carbon.
Hope it helps :)
Consider these equations:
2S (s) + 3O2 (g)→2SO3 (g), ΔH = −792 kJ
2S (s) + 2O2 (g)→2SO2 (g), ΔH = −594 kJ
2SO2 (g) + O2 (g)→2SO3 (g), ΔH =?
What is the missing ΔH?
a. −294 kJ
b. −198 kJ
c. +198 kJ
d. +294 kJ
Answer: (B) −198 kJ.
What are the 10 most important chemical reactions?
Choose ALL correct answers
A.) Combustion of methane (hydrocarbons)
B.) Photosynthesis.
C.) Synthesis of sulfuric acid.
D.) Equilibrium of carbonic acid and carbon dioxide gas.
E.) Biological formation of calcium carbonate.
F.) Rusting of iron.
G.) Production of hydrogen from the action of acid on metal.
H.) Oxidation of alcohol.
I.) Decomposition.
J.) Redox.
Answer:
Combustion of methane (hydrocarbons)
Photosynthesis.
Synthesis of sulfuric acid.
Equilibrium of carbonic acid and carbon dioxide gas.
Biological formation of calcium carbonate.
Rusting of iron.
Production of hydrogen from the action of acid on metal.
Oxidation of alcohol.
Explanation:
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Independent Assessment 1 Directions: Choose the correct concept about the occurrence of an earthquake and a volcanic eruption. Write only the letter of your answer in your activity notebook.
1. A. Tectonic earthquakes occur when rigid plates move because of a fault on the Earth's crust, while volcanic earthquakes occur when rigid plates move because of volcanism. B. Volcanic earthquakes occur when rigid plates move because of a fault on the Earth's crust, while tectonic earthquakes occur when rigid plates move because of volcanism.
2. A. Intensity measures the energy released at the source of the earthquake, while magnitude measures the strength of shaking produced by the earthquake at a certain location. B. Magnitude measures the energy released at the source of the earthquake, while intensity measures the strength of shaking produced by the earthquake at a certain location.
3. A. Seismogram is an instrument that measures the vibrations of the Earth during the shaking, while seismograph is a record of the ground motion at a measuring station as a function of time. B. Seismograph is an instrument that measures the vibrations of the Earth during the shaking, while seismogram is a record of the ground motion at a measuring station as a function of time. 4. A. Mount Mayon in Zambales erupted on June 1991 that its smoke and ashes reached the stratosphere. B. Mount Pinatubo in Zambales erupted on June 1991 that its smoke and ashes reached the stratosphere.
5. A. The violence of volcano eruption is determined by the ashes in the magma. B. The violence of volcano eruption is determined by the gases in the magma.
Pasagot nmn mga mare dyan.
Volcanoes and earthquakes occur due to movement of the Earth's tectonic plates.
How volcanoes and earthquake occur?Both volcanoes and earthquakes occur due to movement of the Earth's tectonic plates. They both occurs due to the heat and energy that is releasing from the Earth's core. Earthquakes can increase or fastens the volcanic eruptions through severe movement of tectonic plates.
Volcanoes eruption occurs when molten rock called magma rises to the surface. Magma is formed when the earth's mantle part melts due to higher temperature.
So we can conclude that volcanoes and earthquakes occur due to movement of the Earth's tectonic plates.
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How many nitrate ions are in 2 mol of iron (II) nitrate
Answer:
Two
Explanation:
Nitrate has a charge of negative 1 and the Iron (II) tells us the iron in that formula has a charge of +2, so in order for the iron to have to equal positive two, there has to be two negative. Since on nitrate ion is -1, you need two to make -2.
What percentage of Earth's land is used for agriculture?
40%
20%
50%
10%
Answer:
40%
Explanation:
hope it helps! God bless
Answer:
40% of Earth's land is used for agriculture.
How many pairs of autosomal chromosomes does each person without chromosomal abnormalities have?
a)46 pairs
b)22 pairs
c)23 pairs
d)45 pairs
Draw the product of the reaction. Draw any hydrogens on oxygen and nitrogen, where applicable.
The product of the reaction will be polar in nature due to the bonds formed between hydrogen and oxygen or nitrogen.
What is a product of a reaction?The product of a chemical reaction is the substance which is formed at the end of the reaction by the reactant or reactants.
The product of a reaction can be formed from the rearrangement of atoms in a compound due to changes in the environment of that compound.
The product can also be formed by the addition or removal of atoms of the reactants.
In the example above, no reactant is shown, however the bonds formed between hydrogen and oxygen or nitrogen gives polarity to the product formed.
Hence, a reactant must be present for a product to be formed.
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Describe an experiment to determine rate of reaction
Answer:
Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules.
If I have 21 moles of gas held at a pressure of 78 atm and a temperature of 901 K, what is the volume of the gas?
n this questions certain
a
r
e
g
i
v
e
n
,
of moles ,n = 21 mol, Pressure P = 78 atm, Temperature T = 900 K, Volume V = ?
We have to calculate the volume of the given moles of gas at specific temperature and pressure.
Using Ideal Gas equation;
PV = nRT
V = nRT /P ( R = gas constant = 0.08206 L atm
m
o
l
−
1
K
−
1
)
V= 21 mol x 0.08206 L atm
m
o
l
−
1
K
−
1
x 900K / 78 atm
V= 73.854 L atm / 78 atm = 0.946 L
Time (sec) [CH4] (mol/L)
0 1.2
20 1.0
40 0.9
60 .85
CH4 (g) + O2 (g) -----> CO2 (g) + H2O (l)
Given the above table and equation above, calculate the average rate of consumption of oxygen from time 20 seconds to time 60 seconds.
Based on the table and the equation of reaction; the
rate of consumption of oxygen between time 20 and 40s is 0.005 M/srate of consumption of oxygen between time 40 and 60s is 0.0025 M/sWhat is rate of a reaction?The rate of a reaction is the rate at which reactants molecules are consumed or products are formed.
Rate of reaction = change in concentration of reactants or products/ time takenBased on the equation of reaction, the rate of consumption of oxygen is equal to the rate of consumption of methane.
Thus. rate of consumption of oxygen from time 20 seconds to time 60 seconds is calculated as follows:
Rate between 20 and 40 = 1.0 - 0.9/20
Rate of consumption of oxygen = 0.005 M/sRate between 40 and 60 = 0.9 - 0.85/20
Rate of consumption of oxygen = 0.0025 M/sTherefore, the rate of consumption of oxygen decreases with time.
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What happens to the temperature of a gas when it is compressed?.
When the maturities of a bond issue are spread over several dates, the bonds are called.