The sentences describe the logistic growth model is when a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely.
What is logistical growth?Logistic or sigmoidal growth involves exponential population growth followed by a steady reduction in population growth until the population size stabilizes, assuming an S-shaped curve.
In this case, we can say this affirmation is true for the S-curve, but not the J-curve.
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Name six metaloids
Answer:
The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine.
Explanation:
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The activation energy of a certain reaction is 45.5 kJ/mol . At 21 ∘C , the rate constant is 0.0110s−1 . At what temperature in degrees Celsius would this reaction go twice as fast?
The temperature in degrees Celsius that the reaction will go twice as fast is 32.4 ⁰C.
Temperature when the reaction rate is twice fasterln(k₂/k₁) = E/R(1/T₁ - 1/T₂)
where;
T₁ is initial temperature = 21 ⁰C = 294 Kk₁ is initial ratek₂ is final rateT₂ is final temperatureE is activation energyR ideal gas constantwhen rate is twice faster, k₂ = 2k₁ = 2(0.011) s⁻¹ = 0.022 s⁻¹
ln(0.022/0.011) = (45,500/8.31)(1/294 - 1/T₂)
0.693 = 5475.33(1/294 - 1/T₂)
1.2657 x 10⁻⁴ = 1/294 - 1/T₂
1/T₂ = 1/294 - 1.2657 x 10⁻⁴
1/T₂ = 3.275 x 10⁻³
T₂ = 305.4 K = 32.4 ⁰C
Thus, the temperature in degrees Celsius that the reaction will go twice as fast is 32.4 ⁰C.
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What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-¹¹ M?
The pH of the solution will be 10.47.
what is pH?The pH of a solution is mathematically given as:
pH = - log [[tex]H^+[/tex]] of -log [[tex]H_3O^+[/tex]]
Thus, in this case, with [[tex]H_3O^+[/tex]] of 3.4 x 10-¹¹ M:
pH = -log 3.4 x [tex]10^-^1^1[/tex] = 10.47
Thus, the pH of the solution will be 10.47.
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I
4. A 1320 g block of lead initially at 35.0°C absorbs 3044 J of heat. What is the final temperature of the
lead? (The specific heat of lead is 0.16 J/g °C)
Answer:
49.41° C
Explanation:
DeltaQ = m c T
3044 = 1320 * .16 * T where T is the temperature change
T = 14.41
35 + 14.41 = 49.41 C
In an experiment magnesium ribbon was heated in air. The product was found to be heavier than the original ribbon. Potassium manganate 7 was on the other hand, heated in air and product formed was to be lighter. Explain the difference on the observation made
Burning a magnesium ribbon in the air is an addition reaction while heating potassium manganate 7 is a decomposition reaction.
Addition and decomposition reactionsMagnesium burns in air to produce magnesium oxide as follows:
[tex]2Mg + O_2 --- > 2MgO[/tex]
Potassium manganate 7 burns to produce multiple products as follows:
[tex]2 KMnO_4 --- > K_2MnO_4 + MnO_2(s) + O_2[/tex]
Thus, the MgO will be heavier than Mg. On the other hand, [tex]MnO_2[/tex] will be less heavy than [tex]KMnO_4[/tex].
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Greenhouse gases act to __________ temperatures by __________ thermal infrared radiation. Group of answer choices increase; reflecting decrease; absorbing and releasing increase; absorbing and releasing decrease; blocking
Greenhouse gases act to increase temperatures by absorbing thermal infrared radiation.
We have already learned that Earth's atmosphere is composed often of nitrogen and oxygen. Those gases are transparent to incoming solar radiation. they may be also transparent to outgoing infrared radiation, which means that they do not take in or emit sun or infrared radiation.
The multiplied quantities of greenhouse gases human sports are adding to the environment have dissatisfied the balance that has been in location for the reason that ceases of the closing ice age, including greater greenhouse gases decreases the amount of infrared radiation energy leaving the atmosphere.
Greenhouse gases inside the ecosystem time and again absorb and re-radiate infrared radiation (warmth). strength radiated from Earth's surface as warmth, or infrared radiation is absorbed and re-radiated by using greenhouse gases, impeding the loss of warmth from our surroundings to area.
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What does the octet rule state about each atom in a chemical compounds outer most energy level?
A. The molecule contains at least eight electrons.
B. The outer most occupied energy level has an octet of electrons.
C. All atoms have eight electrons.
D. None of the above.
Which of the following are true about molecular compounds?
A. A chemical compound whose simplest units are neutrons.
B. A chemical compound whose simplest units are protons.
C. A chemical compound whose simplest units are molecules.
D. None of the above.
Hydrogen bonding is a result of a weak attraction between which of the following?
A. A hydrogen atom and the unshared pair of electrons of a nearby molecule.
B. A hydrogen atom and another hydrogen atom.
C. A hydrogen molecule and hydrogen molecule.
D. None of the above.
Answer:
B. The outer most occupied energy level has an octet of electrons.
D. None of the above.
C. A hydrogen molecule and hydrogen molecule.
Calculate how many grams of iron can be made from 16.5 grams of iron(III) oxide if hydrogen gas is in excess?
Taking into account the reaction stoichiometry, 11.54 grams of Fe are formed from 16.5 grams of iron(III) oxide if hydrogen gas is in excess.
Reaction stoichiometryIn first place, the balanced reaction is:
Fe₂O₃ + 3 H₂ → 2 Fe + 3 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe₂O₃: 1 mole H₂: 3 molesFe: 2 molesH₂O: 3 molesThe molar mass of the compounds is:
Fe₂O₃: 159.7 g/moleH₂: 2 g/moleFe: 55.85 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe₂O₃: 1 mole ×159.7 g/mole= 159.7 gramsH₂: 3 moles ×2 g/mole= 6 gramsFe: 2 moles ×55.85 g/mole= 111.7 gramsH₂O: 3 moles ×18 g/mole= 54 gramsMass of each product formedThe following rule of three can be applied: if by reaction stoichiometry 159.7 grams of Fe₂O₃ form 111.7 grams of Fe, 16.5 grams of Fe₂O₃ form how much mass of Fe?
[tex]mass of Fe=\frac{16.5 grams of Fe_{2} O_{3} x111.7 grams of Fe}{159.7 grams of Fe_{2} O_{3}}[/tex]
mass of Fe= 11.54 grams
Then, 11.54 grams of Fe are formed from 16.5 grams of iron(III) oxide if hydrogen gas is in excess.
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All of the following molecules except _________ make up a homologous series. Question 21 options: CH3CH2CH2CH3 CH3CHCHCH3 CH3CH2CH3 CH3CH2CH2CH2CH3 CH3CH2CH2CH2CH2CH3
All of the following molecules except CH₃CH₂CH₃ make up a homologous series.
What is Homologous Series ?A homologous series is a series of compound having same general formula and same functional group.
What is the general formula of alkene and alkane ?The general formula of alkane is CₙH₂ₙ₊₂
The general formula of alkene is CₙH₂ₙ
CH₃CH₂CH₃ (Propane) is the third homologous series of alkane which satisfies the general formula of alkane.
Thus from the above conclusion we can say that All of the following molecules except CH₃CH₂CH₃ make up a homologous series.
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How many moles of silver can be produced from silver nitrate from 1 mole of zinc?
Answer:
Answer: 6.5 moles of silver metal is formed in the given chemical reaction. The moles of excess reagent left are 0.55 moles.
Explanation:
To calculate the moles of silver formed and the moles of excess reagent left after the reaction, we need to balance the equation first and need to find the limiting and excess reagent.
The balanced chemical equation is:
Zn + 2AgNO3 ---> Zn (NO3)2 +2Ag
By Stoichiometry:
2 moles of Silver nitrate reacts with 1 mole of Zinc metal
So, 6.5 moles of silver nitrate will react with = 1/2 x 6.5 = 3.25 moles of zinc metal
The required amount of zinc metal is less than the given amount of zinc metal, hence, it is considered as an excess reagent.
Therefore, silver nitrate is the limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
2 moles of silver nitrate produces 2 moles of silver metal
So, 6.5 moles of silver nitrate will produce = 2/2 x 6.5 = 6.5moles of silver metal.
Number of moles of excess reagent left after the completion of reaction = (3.8 - 3.25)moles = 0.55 moles
Hence, 6.5 moles of silver metal is formed in the given chemical reaction. The moles of excess reagent left are 0.55 moles.
2. A sample of a gas is occupying a 1500 mL container at a pressure of 3.4 atm and a temperature of 25
C. If the temperature is increased to 75 °C and the volume is increased to 2000 ml, what is the new
pressure?
3. A sample of a gas is occupying a 450 mL container at a pressure of 167 kPa and a temperature of 295 K.
If the pressure is increased to 230 kPa and the volume is decreased to 400 mL, what is the new
temperature in K?
I
4. A sample of gas is occupying a 3.6 L container at a pressure of 9.2 atm and a temperature of 298 K. If
the volume is increased to 5.3 L and the pressure is decreased to 7.3 atm, what is the new
temperature?
pleaseeee hurry thank you!!
2. The new pressure, given the data is 3.0 atm
3. The new temperature in K is 361 K
4. The new temperature in K is 348 K
2. How to determine the new pressureInitial volume (V₁) = 1500 mLInitial pressure (P₁) = 3.4 atmInitial temperature (T₁) = 25 °C = 25 + 273 = 298 K New temperature (T₂) = 75 °C = 75 + 273 = 348 K New Volume (V₂) = 2000 mLNew pressure (P₂) = ?The new pressure of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(3.4 × 1500) / 298 = (P₂ × 2000) / 348
Cross multiply
P₂ × 2000 × 298 = 3.4 × 1500 × 348
Divide both sides by 2000 × 298
P₂ = (3.4 × 1500 × 348) / (2000 × 298)
P₂ = 3.0 atm
3. How to determine the new temperatureInitial volume (V₁) = 450 mLInitial pressure (P₁) = 167 KPaInitial temperature (T₁) = 295 KNew pressure (P₂) = 230 KPaNew Volume (V₂) = 400 mLNew temperature (T₂) =?The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(167 × 450) / 295 = (230 × 400) / T₂
Cross multiply
T₂ × 167 × 450 = 295 × 230 × 400
Divide both sides by 167 × 450
T₂ = (295 × 230 × 400) / (167 × 450)
T₂ = 361 K
4. How to determine the new temperatureInitial volume (V₁) = 3.6 LInitial pressure (P₁) = 9.2 atmInitial temperature (T₁) = 298 KNew Volume (V₂) = 5.3 LNew pressure (P₂) = 7.3 atmNew temperature (T₂) =?The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(9.2 × 3.6) / 298 = (7.3 × 5.3) / T₂
Cross multiply
T₂ × 9.2 × 3.6 = 298 × 7.3 × 5.3
Divide both sides by 9.2 × 3.6
T₂ = (298 × 7.3 × 5.3) / (9.2 × 3.6)
T₂ = 348 K
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What coefficients can be used to balance the following equation
k2co3 + Feci3 -> mic + fe2 (co3)3
2,2,4,1
3,2,6,1
1,1,2,1
3,3,6,1
The coefficient that can be used to balanced the given equation are 3, 2, 6, 1
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to balance the equationK₂CO₃ + FeCl₃ -> KCl + Fe₂(CO₃)₃
There are 3 atoms of C on the right side and 1 on the left side. It can be balanced by writing 3 before K₂CO₃ as shown below:
3K₂CO₃ + FeCl₃ -> KCl + Fe₂(CO₃)₃
There are 6 atoms of K on the left side and 1 on the right side. it can be balanced by writing 6 before KCl as shown below:
3K₂CO₃ + FeCl₃ -> 6KCl + Fe₂(CO₃)₃
There are 6 atoms of Cl on the right side and 3 on the left. It can be balanced by writing 2 before FeCl₃ as shown below:
3K₂CO₃ + 2FeCl₃ -> 6KCl + Fe₂(CO₃)₃
Now the equation is balanced.
Thus, the coefficients are; 3, 2, 6, 1
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How do fission nuclear reactions differ from fusion nuclear reactions?
1*Fission reactions involve the conversion of matter into energy, but fusion reactions do not.
2*Fusion reactions involve the conversion of matter into energy, but fission reactions do not.
3*Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
4*Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
Fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy (option 1).
What are nuclear fission and fusion?Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
On the other hand, nuclear fusion is the combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy.
Therefore, fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy.
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What are the 3 components of an expressway that allows car to enter onto the road?.
3 components of an expressway are :
Acceleration Lane
Merging Area
Slow Lane
Safety design features of an expressway:
Safety elements on the freeways include lane separators and shoulders. Broad, clearly indicated lanes: Highway lanes are broad and feature distinct markings. The inside edge of paved shoulders often has elevated or grooved patterns called "rumble strips" that are typically found alongside major highways.
What are expressways designed for?
Instead of the current practice of every business or establishment connecting the main roadway, access restricted roads have a limited number of designated entry and exit points. Coming onto the main highway is done via segregated service roads.
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Indicate the total number of
(a) p electrons in n (z=7)
(b) s electrons in si (z=14)
(c) 3d electrons in s (z=16)
The total number of :
(a) p electrons in n (z=7) is 3
(b) s electrons in si (z=14) is 6
(c) 3d electrons in s (z=16) is 0
Electronic configuration:
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold expressed in superscript.
The electronic configuration of z=7 (nitrogen) is 1s²2s²2p³
Total number of p electrons = 3
The electronic configuration of z=14 (silicon) is 1s²2s²2p⁶3s²3p²
Total number of s electrons = 2+2+2=6
The electronic configuration of z=16 (sulphur) is 1s²2s²2p⁶3s²3p⁴
Total number of 3d electrons = 0
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Answer:
3, 6, 0
Explanation:
The unknown metal sulfates are hygroscopic and will absorb water from air. The unknowns must thus be kept in desiccators to remove any absorbed water. How would your results be affected if your unknown sample was not desiccated? Would this error cause your calculation of the mass percent of sulfate in the unknown to be too high or too low? Explain.
The sample will be heavier since it will include water if it wasn't desiccated. Therefore, it would be either too high or too low when we calculated the mass percent of sulfate.
What would happen to our results if the unknown sample wasn't dried out?The sample will be heavier since it will include water if it wasn't desiccated. Therefore, it would be either too high or too low when we calculated the mass percent of sulfate.
Water will increase the bulk of the compound when it is added. The compound as a whole will get heavier as a result. However, an element's or molecule's mass does not change.
Therefore, when the denominator rises while the numerator remains constant This implies that your share of the outcome will decline. Because the numerator remains constant while the denominator expands as a result of the water addition, your mass percent will be too low. Consequently, your mass percentage will be too low.
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A 1M solution of barium nitrate is added to the solution. What is the solubility of barium hydroxide after this addition
The solubility of the barium hydroxide after the addition of a 1M solution of barium nitrate is 0.035M
Barium nitrate is a salt that dissolves entirely in solution and is soluble. This indicates that before the salt dissolves, there will be a one molar concentration of barium ions. We may anticipate that the equilibrium will be pushed to the left and the barium hydroxide will be less soluble because we have increased the product side of the reaction. The common ion effect is the name given to this shift in equilibrium.
To ascertain the salt's solubility, we shall use an ICE table.
I. There is a one molar concentration of barium ions (from the barium nitrate) in the solution before the salt starts to dissolve, but there are no hydroxide ions present.
C. The unknown increases in each ion can be referred to as 1+ and 2x, respectively, because every dissolved molecule of barium hydroxide will produce one barium ion and two hydroxide ions. Observe how the previously added one molar concentration in the solution will be combined with the increased barium ion concentration.
E. At this point, we set the solubility equation to the constant representing the solubility product.
[tex]Ba(OH)_{2}[/tex] ⇔ [tex]Ba^{2+} + 2OH^{-}[/tex]
Ksp is defined as:
Ksp = [tex][Ba^{2+}] + [OH^{-}]^{2}[/tex]
5 x [tex]10^{-3}[/tex] = [tex][Ba^{2+}] [OH^{-}]^{2}[/tex]
It added a solution of 1M of [tex]Ba^{2+}[/tex]
5 x [tex]10^{-3}[/tex] = [tex][1M][/tex] [tex][OH^{-}]^{2}[/tex]
The addition of barium hydroxide [tex]Ba(OH)_{2}[/tex] gives:
[tex][Ba^{2+}] = 1M + x[/tex]
[tex][OH^{-}]^{2}[/tex] [tex]= 2x[/tex]
Replacing:
5x[tex]10^{-3}[/tex] = [tex][1+x][/tex] [tex][2x]^{2}[/tex]
[tex]10^{-3} = 4x^{2} + 4x^{3}[/tex]
[tex]x = 0.035 M[/tex]
Your question is incomplete, but most probably your full question was to consider the following balanced equation for the dissociation of barium hydroxide in an aqueous solution.
[tex]Ba(OH)_{2} (s) = Ba^{2+} (aq) + 2OH (aq)\\Ksp = 5* 10^{-3}[/tex]
A 1M solution of barium nitrate is added to the solution. What is the solubility of barium hydroxide after this addition?
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1) Sodium chloride undergoes an electrolysis reaction producing two new substances. One is a metal and the other is a gaseous element.
a) Create a word equation
b) Create a skeleton equation
c) Balance each equation
Metallic sodium and chlorine gas are produced by the electrolysis of molten sodium chloride.
What is a word equation?A word equation represents a chemical reaction using the names of the substances involved.
a) Word equation:
Sodium chloride + electrolysis → Sodium hydroxide + Hydrogen gas, Chlorine gas
b) The following reactions take place during the electrolysis of brine solution :
NaCl =[tex]Na^+ +Cl^-[/tex]
[tex]H_2O[/tex] =[tex]H^+ +OH^-[/tex]
Now there are two cations and two anions which get discharged in the following way :
At cathode : [tex]2H^+ +2e^-[/tex] = [tex]H_2[/tex]
At anode: [tex]2Cl^- - 2e-[/tex]=[tex]Cl_2[/tex]
The remaining ions
[tex]Na^+ +OH-[/tex] = NaOH
That's why we get [tex]H_2[/tex], [tex]Cl_2[/tex] and NaOH.
c) Balance each equation is:
2NaCl (l) → 2Na(s) + [tex]Cl_2[/tex](g)
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please help me with this answer
The method of seed dispersal of the pea plant happens in a mechanical way when the seeds disperse in different directions in what is known as explosive dispersal.
What is Seed Dispersal?This refers to the movement of seeds through a variety of means from the parent plant.
Hence, we can see that the method of dispersal for the blueberry plant is through the process of suc--kering which occurs when new shoots grow and form new suc--kers from the main root cluster.
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Which structure diagram completes the table of physical structures of the main functional groups?
A 6 column table with 1 row. Column 1 is labeled Alchol with entry a molecule R single bonded to O H. Column 2 is labeled Ether with entry a molecule R single bonded to O single bonded to R prime. Column 3 is labeled Ketone with entry blank. Column 4 is labeled Aldehyde with entry Molecule H single bonded to C, which is double bonded to O and single bonded to R. Column 5 is labeled Carboxylic Acid with entry molecule O H single bonded to C, which is double bonded to O and single bonded to R. Column 5 is labeled Ester with entry molecule R prime single bonded to O single bonded to C, which is double bonded to O and single bonded to R.
A molecule H single bonded to C, which is double bonded to O and single bonded to R.
A molecule R prime single bonded to C, which is double bonded to O and single bonded to R.
A molecule O single bonded to C, which is double bonded to R prime and single bonded to R.
A molecule R prime single bonded to C, which is single bonded to O and single bonded to R.
A structure diagram which completes the table of physical structures of the main functional groups is:
R'
|
C = O
|
R
What is a ketone?A ketone can be defined as a class of organic compound that typically comprises a carbonyl group in which an atom of carbon (C) is covalently bonded to an atom of oxygen (O).
In this context, we can infer and logically deduce that a structure diagram which completes the table of physical structures of the main functional groups is as follows:
R'
|
C = O
|
R
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The lowest concentration that can officially reported for any constituent in drinking water is known as the
What is the legal limit?
The lowest concentration that can officially be reported for any constituent in drinking water is known as the "Legal Limit".
Contamination of water:
The level that safeguards human health and that water systems can attain with the finest technology is reflected in the regulatory limit for a contaminant.
How does it occur:
Plumbing components are the main way that lead and copper enters the drinking water. The health effects of lead and copper exposure can range from brain damage to stomach discomfort.Nitrogen, bleach, salts, pesticides, metals, bacterial toxins, and human or animal medications are examples of chemical pollutants. Organisms in the water are biological pollutants. Other names for them include microorganisms and microbiological pollutants.In order to control corrosion, the system must take a variety of additional measures if lead concentrations reach an action threshold of 15 ppb or copper concentrations exceed an action level of 1.3 ppm in more than 10% of measured customer taps.
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An element emits light at a wavelength of 584 nm. What is the energy of the photon with that wavelength?
Write your answer in scientific notation with the appropriate significant figures and unit. The exponent of 10 is written with the carat (^) symbol, so 10^n.
I have already tired writing it as 3.40x10^-19J but was marked wrong.
0.00340239726 ×[tex]10^{-16}[/tex] is the energy of the photon with that wavelength.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The energy of the photon with that wavelength:
E = hv
E = hc/λ
where v = c/λ
h = 6.625 x [tex]10^{-34}[/tex] Js
c = 3 x [tex]10^8[/tex] m/s
λ = 584 nm. x [tex]10^{-9}[/tex] m (1 nm =[tex]10^{-9}[/tex] m)
Putting the values in the equation:
E = (6.625 x [tex]10^{-34}[/tex] Js x 3 x [tex]10^{8}[/tex] m/s) ÷584 x [tex]10^{-9}[/tex] m
E = 1.9875×[tex]10^{-25}[/tex] ÷ 584 x [tex]10^{-9}[/tex]
E = 0.00340239726 ×[tex]10^{-16}[/tex]
Hence, 0.00340239726 ×[tex]10^{-16}[/tex] is the energy of the photon with that wavelength.
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Question 3 of 20
Bromine is less reactive than fluorine because it is … for fluorine to gain an electron
No, Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
Down the group, electronegativity decreases. Electronegativity is the ability of an element to gain the shared pair of electrons. Fluorine is more electronegative than chlorine. Reactivity of halogens is directly proportional to electronegativity of the halogens.
Therefore, bromine is less reactive than fluorine because it is easier for fluorine to gain an electron.
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Which is NOT a physical property of a matter sample?
A.texture
B.toxicity
C.hardness
D.magnetism
Answer:
B.toxicity
Explanation:
Toxicity is talking about how harmful something is to you in terms of molecular and chemical level. Thus, it is chemical property.
Answer:
texture is not a physical property of a matter sample
8.The mass percent of phosphoric acid in cola has been reported to be 0.075% by mass. How does your answer compare to this value (use percent difference to make this comparison)
A mass percent can be calculated by dividing the mass of the component by the total mass of the mixture, multiplied by 100%.
What is Mass Percent?This refers to a way of representing a concentration of elements in a compound or mixture.
Hence, we can see that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept,
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In an endothermic reaction, the ______ have more energy than the _______.
A. reactants, products
B. surroundings, products
C. products, reactants
D. reactants, surroundings
Answer:
C
Explanation:
If the products have a higher energy level than the reactants then the reaction is endothermic.
In an endothermic reaction, the reaction mixture absorbs heat from the surroundings. Therefore, the products will have a higher energy than the reactants and ΔH will be positive.
In an exothermic reaction, the reaction mixture releases heat to the surroundings. Therefore, the products will have a lower energy than the reactants and ΔH will be negative.
If 23.4 g of N2 in a 350 ml container is at a temperature of -34 oC , what is the pressure inside the container?
From the calculation, the pressure of the gas is 47 atm,
What is the ideal gas equation?The ideal gas equation connects the temperature, volume pressure and the number of moles of a gas.
Now;
Number of moles of N2 = 23.4 g /28 g/mol = 0.84 moles
Given that;
P = ?
n = 0.84 moles
V = 350 ml or 0.35 L
T = -34 oC + 273 = 239 K
R = 0.082 atmLK-1mol-1
PV = nRT
P = nRT/V
P = 0.84 moles * 0.082 atmLK-1mol-1 * 239 K/ 0.35 L
P = 47 atm
Hence, the pressure of the gas is 47 atm.
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A chemical reaction in which one element replaces another element in a compound can be catergorized as a
Answer:
[tex]\huge\boxed{\sf Single \ displacement \ reaction}[/tex]
Explanation:
Displacement reaction:A reaction in which an element displaces or replaces another element of a compound is called a displacement reaction.Types:There are 2 types:
1. Single displacement reaction:If one element displaces 1 other element of a compound, it is called single displacement reaction.Example: [tex]CuSO_4 +Fe \longrightarrow \ FeSO_4 + Cu[/tex]Here, 1 element (Fe) displaces 1 other element (Cu) of a compound.2. Double displacement reaction:If two elements in two compounds displace one another, it is called double displacement reaction.Example: [tex]CuSO_4+NaOH \longrightarrow Cu(OH)_2 + Na_2SO_4[/tex]Here, Copper and sodium both displace each other.[tex]\rule[225]{225}{2}[/tex]
0.916 g of iron is heated in air. The resulting procuct weighs 1.178 g. What is the formula of the compound
The formula of the metal oxide is FeO.
When a metal is burned in the air or oxygen the product formed is metal oxide. This is called the combustion reaction of metals.
Calculations:
It is given that the weight of iron (Fe) is 0.916 g. After the reaction, it forms iron oxide that has the weight 1.178 g. The weight of the metal before and after the reaction must have remained same, only the addition of oxygen has taken place.
The mass of oxygen is calculated as:
Mass of oxygen = 1.178 g - 0.916 g
= 0.262 g
The molar mass of oxygen is 16.00 g/mol. The number of moles of oxygen is calculated as:
Moles of O = 0.262 g/16.00 g/mol
= 0.0164 mol
The molar mass of Fe is 55.845 g/mol. The number of moles of Fe is calculated as:
Moles of Fe = 0.916 g/55.845 g/mol
= 0.0164 mol
The number of moles of Fe and O are equal. Hence, the molar ratio between Fe and O is 1:1. Therefore, the formula of the iron oxide is FeO.
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N₂(g) + 3H₂(g) → 2NH3(g)
What volume of hydrogen is
needed to generate 446 L NH3
at STP?
Thank u:)
Answer:
669 Liters
Explanation:
From the equation, it takes 3/2 as much hydrogen as ammonia gas
3/2 * 446 = 669 Liters of H2 gas
Answer:669 Liters
Explanation:
3/2 * 446 = 669 Liters of H2 gas