Answer:
1. A. silicon dioxide
2. D. Hydrogen
Explanation:
Bugaboo can be oxidised to a carboxylic acid by heating with acidified potassium manganate (VII). Give the name and structural formula of the carboxylic acid.
Answer:
See below.
Explanation:
CH3CH2CH2CH2OH is butanol.
The carboxylic acid formed , butyric acid has the formula:
CH3CH2CH2COOH.
Structural formula:
H H H O
| | | ||
H - C - C - C - C - OH
| | |
H H H
When 1 g of a cube of manganese (IV) oxide was added to 100 cm3 of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Based on this information, which of the following is likely to increase the rate formation of the products?
Using 2 grams of manganese oxide
Using 50 cm3 of hydrogen peroxide
Replacing the cube of manganese (IV) oxide with its powder
Removing manganese (IV) oxide from the reaction mixture
Answer:
[tex]\boxed{\text{Replacing the cube of manganese(IV) oxide with its powder}}[/tex]
Explanation:
The MnO₂ is acting as a catalyst: it takes part in the reaction but can be recovered at the end.
A. Using a 2 g cube of MnO₂
The surface area of the catalyst would double, so the rate would probably double. Technically, this option is correct, but I don't think it is the one the questioner intended.
B. Using 50 cm³ of H₂O₂
No effect. The rate depends on how fast the H₂O₂ molecules can reach the surface of the catalyst, and the surface area hasn't changed.
C. Using powdered MnO₂
This would increase the rate enormously, because the powdered catalyst has a much greater surface.
D. Removing MnO₂
The rate would decrease to near-zero, because there is no catalyst.
Replacing the cube of manganese (IV) oxide with its powder is likely to increase the rate of product formation in the reaction between manganese (IV) oxide and hydrogen peroxide, due to increased surface area and more active sites for the reaction. Option C is correct.
When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide to produce water and oxygen, with manganese oxide acting as a catalyst and not being consumed, certain changes can increase the rate of product formation.
Among the provided options, replacing the cube of manganese (IV) oxide with its powder will likely increase the rate of formation of the products most effectively. This is because increasing the surface area of the catalyst, in this case by using powdered manganese oxide instead of a cube, provides more active sites for the reaction, thus facilitating a higher rate of chemical reaction.
On the contrary, using more manganese oxide beyond what is needed as a catalyst does not increase the rate of reaction because a catalyst is not consumed in the reaction. Reducing the volume of hydrogen peroxide or removing the catalyst will not increase the reaction rate but may have the opposite effect.
Hence, C. is the correct option.
The complete question is:
content loaded
When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Based on this information, which of the following is likely to increase the rate formation of the products?
A. Using 2 grams of manganese oxide
B. Using 50 cm³ of hydrogen peroxide
C. Replacing the cube of manganese (IV) oxide with its powder
D. Removing manganese (IV) oxide from the reaction mixture
how many liters will 10.0 grams of hydrogen occupy at stp
Answer:
38.36 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of H₂ in atm (P = 1.0 atm, STP conditions).
V is the volume of H₂ in L (V = ??? L).
n is the no. of moles of H₂ in mol (n = mass/molar mass = (10.0 g)/(2.0 g/mol) = 5.0 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of H₂ in K (T = 0.0°C + 273 = 273.0 K, STP conditions).
∴ V = nRT/P = (5.0 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 38.36 L.
6. Organic or Inorganic?
a. SiO2
b. CsH4Cl2
C. CsH2O2(OH)3
d. Caci
Which are inorganic
a. SiO2 is inorganic
b. CsH4Cl2 and c. CsH202(OH)3 are organic
Got no idea for d. Caci
Compared to 1 liter aqueous solution with a ph of 7, a 1 liter aqueous solution with a ph of 5.0 contains
1. 10 times more hydronium ions
2. 100 times more hydronium ions
3. 10 times more hydroxide ions
4. 100 times more hydroxide ions
A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7, due to the logarithmic nature of pH levels.
Explanation:When comparing the hydronium ion concentration between two aqueous solutions with different pH levels, it is important to understand the logarithmic scale of pH. A pH of 7 is considered neutral, and at this pH, the concentration of hydronium ions is 1.0 × 10-7 M. A solution with a pH of 5 would have a hydronium ion concentration of 1.0 × 10-5 M, which is a factor of 102 or 100 times more hydronium ions than a neutral solution of pH 7. Therefore, a 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7.
A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7. The pH scale is logarithmic, meaning that each unit represents a tenfold difference in concentration. So, a pH difference of 2 between two solutions corresponds to a 100-fold difference in hydronium ion concentrations. Since pH 5 is two units lower than pH 7, the concentration of hydronium ions in the solution with a pH of 5.0 is 100 times greater than the solution with a pH of 7.0.
A chemical process dissolves 500 milligrams of iron oxide every 20 minutes. How long would it take this reaction to dissolve 2 lbs of iron oxide?
Answer:
36290 min = 604.8 hr.
Explanation:
Knowing that:1 lbs = 453.59237 grams.
∴ 2 lbs = 907.18474 grams.
Using cross multiplication:
500 mg of iron oxide dissolved → 20 minutes.
907184.74 mg of iron oxide dissolved → ??? minutes.
∴ The time needed to dissolve 2 lbs of iron oxide = (907184.74 mg)(20 min)/(500 mg) = 36290 min = 604.8 hr.
Which expression is a measurement of density? 20 g/cm 2 5.2 cm 3 0.71 mg 5.13 kg/L
Answer:
5.13 kg/l
Explanation:
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Answer:
5.13 kg/L
Explanation:
The units for density are mass divided by volume. This means that for an expression to be a measurement of density it would need to have an unit of mass in the numerator, and an unit of volume in the denominator.
With that in mind, kg is a unit of mass, and L is a unit of volume, so any positive number followed by "kg / L" is a measurement of density.
You have a cup of tea (250 ml) that is 375 K which is too hot to drink. It needs to be cooled to 350 K before you can drink it. How much thermal energy has to be transferred from the tea to the surroundings to cool the tea? Show all work and include units.
Answer:
The hot tea should transfer 25.63 kJ the surroundings to cool the tea.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat has to be transferred from the tea to the surroundings to cool the tea (Q = ??? J).
m is the mass of the hot tea (m = dV = (1.0 g/mL)(250 mL) = 250 g), suppose the density of water is the density of tea.
c is the specific heat of the hot tea (c = 4.10 J/°C.g).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 350 K - 375 K = -25°C).
∴ Q = m.c.ΔT = (250 g)(4.10 J/°C.g)(-25°C)) = - 25630 J = - 25.63 kJ.
So, the hot tea should transfer 25.63 kJ the surroundings to cool the tea.
The correct labels for the numbers in Figure 7-1 are (1) ____________________, (2) ____________________, and (3) ____________________. brainly
Answer:
A horizon, B horizon, C horizon .
Answer:
The A horizon, the B horizon, and the C horizon respectively.
Which of the galaxies below is called a barred-spiral galaxy
Answer:
The pics aern't loading on my computer, but its the one with the grey-ish spiral around a bright center. It's the vertical-ish one
Explanation:
How does Ionic Polarization works?
Answer:
Ionic polarization. As the name suggests, ionic polarization occurs in ionic materials. It occurs when an electric field is applied to an ionic material then cations and anions get displaced in opposite directions giving rise to a net dipole moment
Explanation:
Answer:
The first person that answered your question is right.
Explanation:
Mark her Brainliest
What takes up space?
O A. Light
O B. Matter
O C. Sound
O D. Energy
Answer:
Matter
Explanation:
Matter is the physical object
Sound: not physical
Energy: Not physical
Light: not physical
How much energy is required to vaporize 10 grams of water at its boiling point? In Joules.
Answer:
On the other hand, the molecules in liquid water are held together by relatively strong hydrogen bonds, and its enthalpy of vaporization, 40.65 kJ/mol, is more than five times the energy required to heat the same quantity of water from 0 °C to 100 °C
Answer: The energy required to vaporize the given amount of water is 22600 J
Explanation:
The conversion involved in this process are:
[tex]H_2O(l)(100^oC)\rightarrow H_2O(l)(100^oC)[/tex]
To calculate the amount of heat required at constant temperature, we use the equation:
[tex]q=m\times L_{vap}[/tex]
where,
[tex]q[/tex] = amount of heat absorbed = ?
m = mass of water = 10 g
[tex]L_{vap}[/tex] = latent heat of vaporization = 2260 J/g
Putting all the values in above equation, we get:
[tex]q=10g\times 2260J/g=22600J[/tex]
Hence, the energy required to vaporize the given amount of water is 22600 J
Match the following vocabulary words. 1. to unite a male reproductive cell with a female reproductive cell deoxyribonucleic acid 2. a new cell formed from two cells at fertilization uterus 3. a special, muscular organ inside a mother that protects a developing embryo conception 4. the fertilization of female egg cell with a male sperm cell gene 5. strings of DNA in cell nuclei zygote 6. the genetic material that determines the nature of life forms fertilize 7. the code for a particular characteristic of a living organism chromosomes
Answer:
1fertilize
2. gene
3. uterus
4. conception
5.chromosomes
6. deoxyribonucleic acid
7. zygote
Answer:
1. To unite a male reproductive cell with a female reproductive cell ---Fertilize
2. A new cell formed from two cells at fertilization --- Zygote
3. A special, muscular organ inside a mother that protects a developing embryo --- Uterus
4. The fertilization of female egg cell with a male sperm cell --- Conception
5. Strings of DNA in cell nuclei --- Chromosomes
6. The genetic material that determines the nature of life forms --- Deoxyribonucleic acid
7. The code for a particular characteristic of a living organism --- Gene
Explanation:
1- Fertilization is the process by which two gametes fuse during sexual reproduction to create a new individual with a genome derived from both parents.
2- In biology, the cell resulting from the union of the male gamete with the female gamete in the sexual reproduction of organisms is called zygote.
3- The uterus is the organ of gestation and the largest organ of the female reproductive system of most mammals, including humans. It is a muscular, hollow, pear-shaped, infraperitoneal organ located in the lower pelvis of the woman who, when adopting the position in anteversion, leans on the urinary bladder in front, with the rectum behind. It lodges the blastula, that is implanted in the endometrium, giving beginning to the gestation.
4- The term conception refers to the action and effect of conceiving. In biology, it is the fusion of two sex cells to give rise to the zygote cell, where the union of the chromosomes of male and female is found.
5- In biology and cytogenetics, it is called chromosome to each of the highly organized structures, consisting of DNA and proteins, which contains most of the genetic information of a living being.
6- Deoxyribonucleic acid, abbreviated as DNA, is a nucleic acid that contains the genetic instructions used in the development and functioning of all living organisms and some viruses; He is also responsible for the hereditary transmission.
7- A gene is an information unit in a deoxyribonucleic acid locus that encodes a functional product, such as proteins. It is the molecular unit of genetic inheritance, because it stores genetic information and allows it to be transmitted to offspring.
hafnium: atomic number
: atomic number 15
: atomic number 45
osmium: atomic number
magnesium: atomic number
Answer:
hafnium: atomic number 72
Phosphorus :Atomic number 15
Rhodium :Atomic number 45
Osmium: atomic number = 76
Magnesium: atomic number = 12
20 points multiple choice, pls hurry!
Answer:
The right choice is → alkane
Explanation:
Alkane, alkene , alkyne, and aldehyde all are organic compounds with different formula.
Alkane has a general formula : CₙH₂ₙ₊₂
Alkene has a general formula : CₙH₂ₙ
Alkyne has a general formula : CₙH₂ₙ₋₂
while, Aldehyde has a -CHO functional group.
in the given example Butane C₄H₁₀ it has the general formula C₄H₂.₍₄₎₊₂
So, the right choice is: → alkane
In which of these systems is the entropy decreasing?
A. Air escaping from tire
B .a gas condensing
C.snow melting
D. Salt dissolving in water
The entropy of a system decreases when a gas condenses into a liquid, which corresponds to option B. a gas condensing. This reflects the second law of thermodynamics where the total entropy of the universe still increases while local decreases are possible with energy transfer.
Entropy is a measure of disorder or randomness in a system, and it is an important concept in thermodynamics. In the question presented, the process in which entropy decreases is the condensation of gas into a liquid or solid. Therefore, the correct answer to which system sees a decrease in entropy is B. a gas condensing.
For example, when water vapor condenses on a cold surface, it goes from a disorderly gas phase to a more ordered liquid phase, which means that its entropy decreases. Energy transfer is necessary for the entropy of a system to decrease. This is consistent with the Second Law of Thermodynamics, which states that for the entropy of a system to decrease, the entropy of the surroundings must increase by a greater amount, thus the total entropy of the universe still increases.
If every oxygen ion has a charge of -2 what must the charge of each aluminum ion be
We must balance the substance. O is -2 so Al must be +2 such as that x - 2 = 0 and therefore x = 2.
The charge of each aluminium ion must be +2.
Hope this helps.
Which of these space missions visited the moon several times?
A. Apollo
B. Mercury
C. Voyager 1
D. Gemini
Answer:
A. Apollo
Explanation:
Apollo 11 then six other trips to the moon was followed after that. Apollo 17 was the last one.
Answer:
Apollo
Explanation:
Carbon dioxide and water are produced when pentane (C5H12) reacts with oxygen. What is the balanced equation for this reaction
The balanced equation for the reaction between pentane (C₅H₁₂) and oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) is:
C₅H₁₂ + 8O₂ —> 5CO₂ + 6H₂OThe equation for the reaction between pentane and oxygen to produce carbon dioxide and water can be written as follow:
Pentane => C₅H₁₂
Oxygen => O₂
Carbon dioxide => CO₂
Water => H₂O
Pentane + Oxygen —> Carbon dioxide + Water
C₅H₁₂ + O₂ —> CO₂ + H₂O
The above equation can be balance as follow:
C₅H₁₂ + O₂ —> CO₂ + H₂O
There are 5 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 5 before CO₂ as shown below:
C₅H₁₂ + O₂ —> 5CO₂ + H₂O
There are 12 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 6 before H₂O as shown below:
C₅H₁₂ + O₂ —> 5CO₂ + 6H₂O
There are 2 atoms of O on the left side and a total of 16 atoms on the right side. It can be balance by writing 8 before O₂ as shown below:
C₅H₁₂ + 8O₂ —> 5CO₂ + 6H₂O
Now, the equation is balanced.
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Answer:
the answer is C
Explanation:
edge 2023
PLEASE HELP!!!
Calculate the PH of an acid solution containing 0.10 M HNO3
Considering the definition of pH, the pH of an acid solution containing 0.10 M HNO₃ is 1.
You need to know that pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]
On the other side, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid equals the concentration of hydrogen ions.
In this case, HNO₃ is a strong acid, so:
[HNO₃]= [H⁺]= 0.10 M
So the pH can be calculated as:
pH= - log (0.10 M)
Solving:
pH= 1
Finally, the pH of an acid solution containing 0.10 M HNO₃ is 1.
Learn more:
brainly.com/question/16032912?referrer=searchResults brainly.com/question/13557815?referrer=searchResultsThe pH of a solution can be calculated using the formula pH = -log [H3O+]. In this case, the pH of a 0.10 M HNO3 acid solution would be 1.0 because HNO3 completely dissociates in water, and the hydronium ion concentration is 0.10 M.
Explanation:This problem pertains to the field of acids and bases, specifically dealing with the concept of pH. The pH of a solution can be calculated using the formula pH = -log [H3O+], where [H3O+] stands for the hydronium ion concentration. Bear in mind that for a strong monoprotic acid such as HNO3, the concentration of this acid equals the concentration of hydronium ions due to its complete dissociation in water.
In this case, [H3O+] equals 0.10 M, the same as the concentration of HNO3. Now, substituting this into the pH formula gives us pH = -log(0.10), which simplifies to a pH of 1. This means the pH of a 0.1M HNO3 solution would be 1.0.
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A single proton has what electrical charge?
A Proton has a Positive Charge
A single proton has one unit of positive charge. For a neutral atom the number of electrons and protons is equal and the charges gets canceled each other.
What is a protons ?The basic unit every substance in the universe is called an atom like the cell in an organism. An atom is made of sub atomic particles protons, electrons and neutrons.
Neutrons are neutral and protons are positively charged particles. Electrons are negatively charged particles and they are revolving around the nucleus through circular trajectories of fixed energies.
The number of protons and electrons in an atom is same and that make an atom neutral in ground state. The positive charges of protons is canceled by equal number of negative charges.
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HELP ASAP GIVING BRAINLIEST!
When a pendulum is at the bottom of its swing, does it have kinetic or potential energy?
Answer: When a pendulum is at the bottom of its swing, it has kinetic energy.
Explanation: At the bottom of a swing, the greatest speed is achieved. Speed/Velocity equals Kinetic Energy, as potential energy is when speed is at its lowest.
Balance the chemical equation. ___Mg + ___Fe2O^3 -> ___MgO + ___Fe
Answer:
3Mg + Fe₂O₃ → 3MgO + 2Fe.
Explanation:
To balance the equation, you should apply the law of conservation of mass for the equations.The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).The balanced equation is:3Mg + Fe₂O₃ → 3MgO + 2Fe.
That 3.0 mole of Mg react with 1.0 mole of Fe₂O₃ to produce 3.0 moles of MgO and 2.0 moles of Fe.
The no. of all atoms is the same in both of reactants and products side.Mg (3), Fe (2), and O (3).
What else is produced during the replacement reaction of magnesium and hydrochloric acid?
Answer:
MgCl₂ and H₂
Explanation:
The reaction between Magnesium and Hydrochloric acid is a single replacement reaction. In a single replacement, a metallic ion replaces another ion based on their positions in the activity series.
The reaction can be written as:
Mg + HCl → ?
The ionic form can be written as:
Mg + H⁺ + Cl⁻ → ?
Now lets look at the reaction halves:
Mg → Mg²⁺ + 2e⁻ This is an oxidation half in which 2e⁻ is lost
2H⁺ + 2e⁻ → H₂ This is a reduction half in which 2e⁻ is gained
In the activity series, Mg is higher up and is able to replace the hydrogen ions that in the lower part of the series.
Combining both reaction halves, we have:
Mg + 2H⁺ → Mg²⁺ + H₂
If we include the spectator ions we have:
Mg + 2HCl → MgCl₂ + H₂
how mant low dose 81mg aspirin tablets can be made from 1.21 kg of aspirin
Answer:
14,938 tablets.
Explanation:
WE divide:
1.21 kg / 81 mg
1.21 kg = 1,210 g = 1.210,000 mg.
So it is 1,210,000 / 81
= 14,938 tablets.
14,938 tablets of 81mg aspirin tablets can be made from 1.21 kg of aspirin
Aspirin:It is a medication used to reduce pain, fever, or inflammation.
Calculation for doses:
[tex]\frac{1.21 kg}{81 mg}\\\\1.21 kg = 1,210 g = 1.210,000 mg[/tex]
Thus,
[tex]\text{Number of tablets} =\frac{1,210,000mg}{81mg} \\\\= 14,938 \text{ tablets}[/tex]
Thus, number of tablets are 14,938.
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Can someone please write a short detailed description of the particle transformation from liquid to gas phase. 99 POINTS, WILL MARK BRAINLIEST
Answer:
Well, the heat makes the molucules move faster. And the liquid evaparetes.
[I can write a better one thought ^_^]
Explanation:
Answer:
the heat makes the molucules move faster. And the liquid evaparetes.
Explanation:
Discuss about the chemical composition of various types of lava rocks and magma. How is their chemical make-up related to their era and geographic origin?
The diameter of a sphere is 4 centimeters. Which represents the volume of the sphere?
321 cm 87 cm 541 cm
167 cm
A sphere is perfectly symmetrical and it is not a polyhedron. A sphere has a constant width and circumference. The volume of the sphere with a diameter of 4cm is 33.40 cm³. The correct option is B.
What is volume of a sphere?The amount of space occupied by the three dimensional object is defined as the volume of the sphere. A sphere is defined by three axes namely x-axis, y-axis and z-axis. It has no flat face but a curved face.
The equation used to calculate the volume of sphere is:
Volume = 4/3 πr³
Diameter = 4cm
radius = 2cm
Then the volume is:
Volume = 4/3 × 3.14 × (2)³
Volume = 33.40 cm³
Thus the correct option is B.
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Your question is incomplete most probably your full question was:
The diameter of a sphere is 4 centimeters. Which represents the volume of the sphere?
A. 321 cm³
B. 33.40 cm³
C. 541 cm³
D. 167 cm³
all endothermic reactions produce heat and make surroundings warm.
True
False
Answer:
The statement is False.
Explanation:
Endothermic reactions absorbs heat and make surrounding temperature low. The reaction which produces heat and make surroundings warm is called the exothermic reaction. Exothermic reactions produce heat. In Endothermic reactions, molecular bonds gets broken and new molecular bonds may possibly form. So energy is needed to be stored in these bonds, so through endothermic reactions, surrounding energy is absorbed in the bonds and the temperature of the surroundings drops.
Answer:
False
Explanation:
endothermic reactions do not produce heat, they only absorb heat from the surrounding. Exothermic reactions produce heat.