Answer:
189.71 secs
Explanation:
We know that decomposition is a first order reaction;
So;
ln[A] = ln[A]o - kt
But;
[A]o = 1.00 M
[A] = 0.250 M
t =135 s
Hence;
ln[A] - ln[A]o = kt
k = ln[A] - ln[A]o/t
k = ln(1) - ln(0.250)/135
k =0 - (-1.386)/135
k = 1.386/135
k= 0.01
So time taken now will be;
ln[A] - ln[A]o = kt
t = ln[A] - ln[A]o/k
t = ln (3) - ln(0.450)/0.01
t = 1.0986 - (-0.7985)/0.01
t = 1.0986 + 0.7985/0.01
t = 189.71 secs
Do Covalent bonds have weaker or stronger chemical bonds than Ionic bonds?
Ionic bonds are stronger than covalent bonds since they are of opposite charges. This makes them more attracted to each other, creating bonds that are harder to break. Covalent bonds don't have this and only occur to share electrons between atoms.
I hope this helps!
the kenetic energy of an object always depends on which property?
Which process causes earth surface to warm
Which compounds have the empirical formula CH20?
a. C2H402
b. C3H603
c. CH202
d. C5H1005
e C6H1206
Answer:
Answer is A.
Explanation:
I hope it's helpful!
How many neutrons are contained in nitrogen -15?
Answer:
7 neutrons
Explanation:
A radioactive element has a half- life of 2 days. Which fraction represents the amount of an original sample of this element remaining after 6 days?
Answer : The fraction represents the amount of an original sample of this element remaining after 6 days is [tex]\frac{1}{8}[/tex] .
Explanation :
Half-life = 2 days
Time = 6 days
Formula used:
[tex]N=N_o\times (\frac{1}{2})^{(\frac{t}{t_{1/2}})}[/tex]
where,
N = final amount
[tex]N_o[/tex] = initial amount
t = time
[tex]t_{1/2}[/tex] = half-life
Now putting all the given values in the above formula, we get:
[tex]N=N_o\times (\frac{1}{2})^{(\frac{6}{2})}[/tex]
[tex]\frac{N}{N_o}=(\frac{1}{2})^{(\frac{6}{2})}[/tex]
[tex]\frac{N}{N_o}=(\frac{1}{2})^3[/tex]
[tex]\frac{N}{N_o}=\frac{1}{8}[/tex]
Therefore, the fraction represents the amount of an original sample of this element remaining after 6 days is [tex]\frac{1}{8}[/tex] .
Question: Write a short paragraph on how you separate mixtures at home?
Answer:
We can separate mixtures at home by following ways;
Mixtures can be separated using a variety of techniques.
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
A leak in the air conditioning of an old car releases Chlorofluorocarbons (CF2C\2) into the air.
Each month the car releases 62g of CF2Cl2. How much fluorine is emitted into the air each
YEAR by this car?
Answer:
[tex]m_F=234gF[/tex]
Explanation:
Hello!
In this case, given that one molecule of CF2Cl2 contains two moles of atoms of fluorine, we can set up the following dimensional analysis to compute the emitted fluorine each year by the considered car:
[tex]m_F = \frac{62gCF_2Cl_2}{1month}*\frac{12months}{1year}* \frac{1molCF_2Cl_2}{120.91gCF_2Cl_2}*\frac{2molF}{1molCF_2Cl_2} *\frac{19.0gF}{1molF} \\\\m_F=234gF[/tex]
Best regards!
Aqueous solutions of Na2CO3 and Ca(NO3)2, 0.10 M each, are combined. A white precipitate is observed in the container after mixing. The precipitate is filtered and carefully rinsed with distilled water to remove other ions. A sample of the precipitate is added to 100 mL of 0.1 M NaCl. A second sample of the precipitate is then added to 100 mL of 0.1 M HCl. What would be observed in each case
The question is incomplete. Here is the complete question.
Aqueous solutions of [tex]Na_{2}CO_{3}[/tex] and [tex]Ca(NO_{3})_{2}[/tex], 0.10 M each, are combined. A white precipitate is observed in the container after mixing. he precipitate is filtered andcarefully rinsed with distilled water to remove other ions. A sample of the precipitate is added to 100 mL of 0.1 M NaCl. A second sample of the precipitate is then added to 100 mL of 0.1 M HCl. What would be observed in each case?
Observation upon Observation upon
addition of precipitate addition of precipitate
to NaCl(aq) to HCl(aq)
(A) additional precipitates forms no visible reaction occurs
(B) no visible reaction occurs gas is produced and some precipitate dissolves
(C) no visible reaction occurs no visible reaction occurs
(D) additional precipitates forms gas is produced and some
precipitate dissolves
Answer: (B) No visible reaction occurs; Gas is produced and some precipitate dissolves
Explanation: When aqueous solutions of [tex]Na_{2}CO_{3}[/tex] and [tex]Ca(NO_{3})_{2}[/tex] are combined, it reacts according to the following balanced equation:
[tex]Na_{2}CO_{3}+Ca(NO_{3})_{2}[/tex] → [tex]CaCO_{3}_{(s)}+2NaNO_{3}_{(aq)}[/tex]
forming calcium carbonate ([tex]CaCO_{3}[/tex]), which, as it is insoluble in water, precipitates as a solid of the color white. This process is Precipitation and this reaction is a Precipitation Reaction.
When calcium carbonate reacts with NaCl it produces:
[tex]CaCO_{3}+2NaCl[/tex] → [tex]CaCl_{2}+Na_{2}CO_{3}[/tex]
Now, calcium chloride is an inorganic compound very soluble in water, so, in this reaction, there are no precipitate and no visible reaction occurs.
When [tex]CaCO_{3}[/tex] reacts with hydrochloridric acid, the balanced reaction is
[tex]CaCO_{3}+2HCl[/tex] → [tex]CaCl_{2}+H_{2}CO_{3}[/tex]
which, also produces calcium chloride and carbonic acid.
Both are soluble in water but, when carbonic acid is in an "aqueous state", carbonic acid, it dissociates, forming carbon dioxide and water. Therefore, gas is produced and some precipitate dissolves.
In conclusion, sentence B is the correct alternative.
An example of a chemical change A. Fireworks B. Chemical reaction C. Chemical change D. Energy
Plzzzzzzzzzzz helpppppp
Answer:
True
Explanation:
If someone's genetics were Bb, B would be the dominant trait and b would be the recessive trait.
Answer:
True
Explanation:
That's how it works
Why is an ice cube less dense than liquid water?
O A. Molecules in ice have less space between them than molecules in liquid water
O B. Molecules in ice are more spread out than molecules in liquid water.
O C. Ice molecules have less mass than water molecules.
O D. Ice molecules have more mass than water molecules.
Anwser is B. Just got correct.
Answer:
B hope this helps
Explanation:
The density of a substance describes how closely its molecules are packed. Despite the fact that ice is a solid form, an ice cube contains many pores in and the molecules are more spread in the state than that in liquid state of water.
What is density?Density of a substance is the measure of its mass per unit volume. It describes how closely packed its molecules within a given volume. If the molecules have enough space to spread they will be less dense.
The objects which are less dense than water will float in it. Whereas which are having more density will sink on it. Ice floats on water because, ice is less dense than water.
An ice cube has a pore structure and one ice cube contains fewer water molecules and which are spread through the porous structure. Therefore, water in liquid state is more dense than ice.
To find more on density, refer here:
https://brainly.com/question/15164682
#SPJ5
g Does a reaction occur when aqueous solutions of chromium(III) sulfate and ammonium phosphate are combined
Answer:
See explanation
Explanation:
The reduction potential of Cr III is more negative than that of NH4+ hence NH4+ will be displaced by Cr III from a solution of its salt according to the following reaction equation;
Cr2(SO4)3 + 2(NH4)3PO4--------->2CrPO4 + 3(NH4)2(SO4)
Hence;
A reaction occurs when aqueous solutions of chromium(III) sulfate and ammonium phosphate are combined.
How many valence electrons would an element with an electron configuration ending in p5 have?
Answer: 7 valence electrons
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies.
Valence electrons are the number of electrons constituting the outermost shell of an atom.
Thus the electronic configuration could be :
[tex]1s^22s^22p^5[/tex]
Thus the outermost orbit is 2 which has (2+5)= 7 electrons. Thus there are 7 valence electrons.
Can anyone help me ASAP
Answer: Balance, multiply, find ratio
Explanation:
Balance the equation to be able to multiply correctly and accurately, multiply, and this will give you the molar ratio
Differentiate between a mixture and a compound. Provide an example of each using the characteristics outlined in the lesson to support your example.
Explanation:
A compound is a pure substance formed by the combination of two or more kinds of atoms or elements joined together in a definite grouping.
An mixture is an impure substance made up of different types of substances.
Here are some of the differences between them;
A compound is a pure substance whereas a mixture is an impure substance. All parts of a compound are homogenous throughout where a mixture is often heterogeneous. Compounds have definite compositions whereas mixtures do not have a definite composition. Compounds cannot be easily broken down by physical means whereas in mixtures, separation is by physical means. Compound have a unique set of physical properties whereas mixtures have varied set of physical properties.Examples of compounds are water, sodium chloride, hydrochloric acid
Mixtures are air, ocean water, alloys, et.c
Which of the following is the most accurate definition of heredity?
A. The storage of information in the nucleus of every cell in the body
B. The passage of genetic instructions from one generation to another
C. The relationship of one organism to another by evolutionary history
D. The adaptation of an organism for better survival in a new habitat
Answer:
The passage of genetic instructions from one generation to another
Explanation:
The one that is most accurate definition of heredity is the passage of genetic instructions from one generation to another. The correct option is B.
What is the reason behind heredity?Heredity, also known as inheritance or biological inheritance, is the transmission of traits from parents to their offspring; the offspring cells or organisms acquire the genetic information of their parents through reproduction.
Genes are composed of DNA (deoxyribonucleic acid), which contains instructions for cell function as well as the characteristics that distinguish you.
Each biological parent gives you half of your genes, and you may inherit a gene mutation from one or both of your parents. Sometimes genes change as a result of problems with the DNA (mutations).
Hereditary theory holds that many physical characteristics can be passed down from generation to generation via DNA, by passing on a set of instructions or genes in DNA to offspring. You pass on the physical characteristics that you have.
Thus, the correct option is B.
For more details regarding heredity, visit:
https://brainly.com/question/18814294
#SPJ6
A rocky hill cracks after water settles and freezes. Several trees on the hill tilt due to the very slow downhill movement of rock and soil. The movement occurs over a long distance.
Which type of mass movement does this describe?
creep
landslide
mudflow
slump
Answer:
A. Creep
Explanation:
Creep is usually defined as a mass movement process where the rock and other particles are forced to move slowly downward along a slope that is mostly covered with softer sediments and broken rock fragments. It results in the tilting of trees, poles, and gravestones.
The type of mass movement described above is a creep.
What is creep movement?Creep movement refers to the slow downslope of different objects and/or materials that occurs on a particular slope surface.
In nature, creep movement is common to describe the slow tilt movement of different materials such as trees and poles on a hillside.
Creep movement occurs on a geological scale, ie, this movement may take hundreds of years.
In conclusion, the type of mass movement described above is a creep.
Learn more about creep movement here:
https://brainly.com/question/1338131
What type of energy does the
mitochondrion provide the cell?
chemical energy (ATP)
light energy
thermal energy
sound energy
The answer is multiple choice
Answer:
Thermal
Explanation:
I think im not quite sure but since thermal is basically heat energy, I assume it would be thermal energy
A chemistry student needs 30.0 of tetrahydrofuran for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of tetrahydrofuran is 0.889 g x cm^-3 . Calculate the volume of tetrahydrofuran the student should pour out.
Answer: The volume of tetrahydrofuran the student should pour out is 33.7 ml
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of tetrahydrofuran = 30.0 grams
Density of tetrahydrofuran = [tex]0.889gcm^{-3}[/tex]
Putting in the values we get:
[tex]0.889gcm^{-3}=\frac{30.0g}{Volume}[/tex]
[tex]Volume=\frac{30.0g}{0.889gcm^{-3}}=33.7cm^3=33.7ml[/tex] [tex](1cm^3=1ml)[/tex]
Thus volume of tetrahydrofuran the student should pour out is 33.7 ml
An isotype has the same number of _____ but a different number of ______ than other atoms of the same element
electrons, protons, neutrons are the answer choices for both
Answer:
BTS
Explanation:
when aqueous solutions of sodium hypochlorite and nitric acid are mixed, an aqueous solution of sodium nitrate and hypochlorous acid results. Write the net ionic equation for the reaction.
Answer:
H+ (aq) + ClO- (aq) ---> HClO(aq)
Explanation:
The net ionic reaction equation is a chemical equation that explicitly shows only the particular ions that undergo a chemical change in the course of a given reaction.
In this particular reaction, the molecular reaction equation is shown as follows;
HNO3(aq) + NaOCl(aq) -----------> NaNO3(aq) + HOCl(aq)
Ionically;
H+ (aq) + ClO- (aq) ---> HClO(aq)
3. What are the products of the following reaction?
H2SO4 + KOH --> *
A) H2 + K2904
B) H2O + K2SO4
C) HK + HSO4
D) H2O + KS04
Answer:
H2SO4 + 2KOH -------> K2SO4 + 2H2O
Explanation:
The raw water supply for a community contains 18 mg/L total particulate matter. It is to be treated by addition of 60 mg alum (Al2(SO4)3 14H2O) per liter of water treated. Essentially, all the added alum precipitates represented by the following reaction:
Required:
a. For a total flow of 8000 m^3/d, compute the daily alum requirement and the concentration of solids in the water following alum addition, assuming the alum all precipitates as Al(OH)3(s).
b. The water is initially at pH 7.5 and has ALK=40 mg/L as CaCO3. It is desired to maintain solution pH at 6.5 or higher. Will the pH be in the acceptable range after the chemical addition and Al(OH)3(s) precipitation?
c. What will the pH be if the treated solution is bubbled with air, so that it reached equilibrium with atmospheric CO2?
Solution :
Given :
The steady state flow = 8000 [tex]$ m^3 /d $[/tex]
[tex]$= 80 \times 10^5 \ I/d $[/tex]
The concentration of the particulate matter = 18 mg/L
Therefore, the total quantity of a particulate matter in fluid [tex]$= 80 \times 10^5 \ I/d \times 18 \ mg/L $[/tex]
[tex]$= 144 \times 10^6 \ mg/g$[/tex]
[tex]$= 144 \ kg/d $[/tex]
If 60 mg of alum [tex]$ [Al_2(SO_4)_3.14 H_2O] $[/tex] required for one litre of the water treatment.
So Alum required for [tex]$ 80 \times 10^5 \ I/d $[/tex]
[tex]$= 80 \times 15^5 \ I/d \times 60 \ mg \ alum /L$[/tex]
[tex]$= 480 \times 10^6 \ mg/d $[/tex]
or 480 kg/d
Therefore the alum required is 480 kg/d
1 mg of the alum gives 0.234 mg alum precipitation, so 60 mg of alum will give [tex]$ = 60 \times 0.234 \text{ of alum ppt. per litre} $[/tex]
[tex]$= 14.04 $[/tex] mg of alum ppt. per litre
480 kg of alum will give = 480 x 0.234 kg/d
= 112.32 kg/d ppt of alum
Daily total solid load is [tex]$= 144 \ kg/d + 112.32 \ kg/d$[/tex]
= 256.32 kg/d
So, the total concentration of the suspended solid after alum addition [tex]$= 18 \ mg/L + 60 \times 0.234 $[/tex]
= 32.04 mg/L
Therefore total alum requirement = 480 kg/d
b). Initial pH = 7.4
The dissociation reaction of aluminium hydroxide as follows :
[tex]$Al(OH)_3 \rightleftharpoons Al^{3+} + 3OH^{-} $[/tex]
After addition, the aluminium hydroxide pH of water will increase due to increase in [tex]$ OH^- $[/tex] ions.
Therefore, the pH of water will be acceptable range after the addition of aluminium hydroxide.
c). The reaction of [tex]$CO_2$[/tex] and water as follows :
[tex]$CO_2 (g) + H_2O (l) \rightarrow H_2CO_3$[/tex]
For the atmospheric pressure :
[tex]$p_{CO_2} = 3.5 \times 10^{-4} \ atm $[/tex]
And the pH is reduced into the range of 5.9 to 6.4
What does point of view refer to?
the purpose of whoever is telling the story
the age of whoever is telling the story
the perspective of whoever is telling the story
Answer:
I'd say the most reasonable answer is perspective.
Explanation:
"Point of view" is about who is telling and sharing the details in what you are writing or reading. I'm not 100% sure because the word "perspective" doesn't seem like the right word to use, but it's better than the other two in my opinion.
Which of the following plant structures provides most of the water necessary for photosynthesis?
а. roots
b. leaves
chloroplasts
d. stomata
Answer:
Explanation:
a:)
The plant structure that provides most of the water necessary for photosynthesis is the leaves. The correct option is b.
What is photosynthesis?Through a process known as photosynthesis, green plants and some other animals transform light energy into chemical energy. The main, readily available, non-recyclable component of photosynthesis is sunlight.
Plants use their roots to draw water from the soil. Water is necessary for photosynthesis, which primarily takes place in a plant's leaves, as you probably already know.
Chloroplasts, which are found in the mesophyll of the leaves, are where photosynthesis occurs. The chlorophyll in the thylakoids, which are located inside the chloroplast, absorbs the various colors of light to produce energy.
Therefore, the correct option is b. leaves.
To learn more about photosynthesis, refer to the below link:
https://brainly.com/question/13261372
#SPJ2
( urgent help needed!! 50pts + brainliest )
What particle remains when uranium-238 undergoes alpha decay?
A. thorium-234
B. protactinium-234
C. plutonium-234
D. neptunium-234
Answer:
Thorium-234 option a .......
238 4 234
U --> α + Th
92 2 90
The answer is A Thorium.
Suppose 2.27g of lead(II) nitrate is dissolved in 300.mL of a 52.0mM aqueous solution of ammonium sulfate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the lead(II) nitrate is dissolved in it.
Answer:
0.0457M is molarity of nitrate anion in the solution.
Explanation:
Molarity is defined as the ratio between moles of solute (In this case, nitrate ion) and liters of solution (The total volume of the solution is 300.0mL = 0.300L).
Thus, we need to convert mass of Lead(II) nitrate to moles using its molar mass (Molar mass Pb(NO₃)₂: 331.2 g/mol). Moles of Pb(NO₃)₂ = 1/2 Moles of NO₃⁻:
Moles Pb(NO₃)₂ and moles of NO₃⁻:
2.27g * (1mol / 331.2g) = 0.006854 moles Pb(NO₃)₂ * (2moles NO₃⁻ / 1mol Pb(NO₃)₂) = 0.0137moles NO₃⁻
Molarity is:
0.0137 moles NO₃⁻ / 0.300L =
0.0457M is molarity of nitrate anion in the solutionThe _______________ react with the _______________ elements to form different compounds like lithium fluoride (LiF) and sodium chloride (NaCl). _______________ have a full valence level and do not combine with other elements.
Answer: Alkali metals, halogens, noble gases
Explanation:
Ionic compounds are made of ions- charges. In LiF and NaCl, the first element has a +1 and the second element has a charge of -1. Elements that are +1 are alkali metals and elements that are -1 are halogens. Noble gases have full octets in their outermost valence shell, and since they're full it's so stable so it doesn't react with anything.
Which of these is a typical property of a substance that is composed of atoms that are held together by covalent bonds?
Answer) It does not conduct electricity in any form. Consider the location of barium, chlorine, iodine, and strontium on the periodic table. It conducts electricity when it is dissolved in water.
I hope it is helpful
