The most prevalent indicators used in complexometric titrations are organic dyes, which work by generating a clouded complex with the metal ion under test.
The indicator is replaced by EDTA during the reaction to create a more stable complex with the metal, and after the reaction is finished, the colour is changed.
The acronym EDTA stands for ethylenediaminetetraacetic acid. For the titration, an excessive amount of EDTA is used to react with the sample solution's calcium and magnesium ion titrations. When the indicator is applied, it stays blue because the EDTA has complexed with all of the Ca2+ and Mg2+ ions present for titrations.
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In the reaction 2H₂ + O₂ → _H₂O, what coefficient should be placed in front of H₂O to balance the reaction?
A. 1
B. 2
C. 3
D.4
Answer: B.2
Explanation: math
A student was conducting an experiment in the laboratory that had a temperature of 272 °C. The student needed to log the temperature in Kelvin. What temperature should the student write down in Kelvin?
a
-1 K
b
136 K
c
0 K
d
545 K
Answer:
d 545K
Explanation:
0°C = 273K
so, 272°C = (273+272)K
Scientists used to believe that chemical reactions fueled the sun. Why did this lead them to believe that the sun was very young? What kind of reactions do we now think are responsible for the energy released by the sun? In one to two sentences, explain your reasoning.
The energy produced by the sun is the result of nuclear reactions that produce large amounts of energy.
A particular type of nuclear fusion that occurs within the Sun is known as proton-proton fusion. Inside the Sun this process begins with protons and, through a series of steps, fuses these protons into helium. In a chemical reaction, reactants come into contact with each other, bonds between atoms in the reactants are broken, and the atoms rearrange to form new bonds to produce products.
Part of the mass of the hydrogen atom is converted into energy in the form of light. The same process occurs in thermonuclear fusion bombs. Under the sun, the process is controlled. In a bomb, everything happens at once in a big chain reaction, with nuclear fusion reactions powering the sun and other stars. In a nuclear fusion reaction, two light nuclei fuse into one heavy nucleus. The total mass of the resulting single nucleus is less than the mass of the original two nuclei.
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State, in terms of subatomic particles, how an atom of cu-63 differs from an atom of cu-65?
Cu-63 atoms are different from Cu-65 atoms in that they contain 2 or fewer less neutrons. Cu-63 and Cu-65 have 34 and 36 neutrons, respectively, in each atom.
The atomic number of copper is 29, and it has the mass number 63. The mass number is equal to the sum of the protons and neutrons in the nucleus, while the atomic number refers to the quantity of protons in the nucleus. This indicates that the nucleus of the copper atom contains 34 neutrons and 29 protons, for a total of 63 protons. This atom has the mass number 63 because it is a copper-63 atom. The number that corresponds to that element on the predictable serves as the atomic number, which is the same for every atom of a given element.
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Is the bright line spectrum a physical or chemical property
Answer: Physical Chemistry
Explanation: The spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background.
The bright line spectrum is a physical property of an element because it exhibits the physical appearance of an element.
What is the bright line spectrum?The formation of a bright line spectrum when a light beam passes through an analyte sample and some of the light is absorbed by the atoms present in the sample which excites the electrons to the higher energy states.
As the excited electron of an atom returns to the ground state, the energy is released in the form of discrete or quantized lines of light. Spectral lines are generated by the transitions of electrons within atoms.
As the electrons move closer or farther from the nucleus of an atom, energy in the form of light is absorbed or emitted. A continuous spectrum has accompanied the light of all wavelengths within a certain range whereas a line spectrum only contains only a few wavelengths.
Therefore, the bright line spectrum is considered a physical property of an element because of the occurrence in the physical appearance of that element.
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If a rock has volume of 78 cm3 and a mass of 158 g, what is the density of the rock
Answer:
2.03 g/cm3
Explanation:
d = m/V = 158/78 = 2.02564102564 or 2.03 g/cm3
X-rays, Green light, Blue light, ultraviolet light
3. Which of the above forms of radiation has
The most energy
The longest wavelength
The highest frequency
X-rays have the most energy, ultraviolet light has the shortest wavelength, and gamma rays have the highest frequency.
What is ultraviolet?
The wavelength of ultraviolet (UV) radiation ranges from 10 nanometers (nm; corresponding frequency: 30 PHz) to 400 nanometers (nm; corresponding frequency: 750 THz), which is shorter than the wavelength of visible light but longer than the wavelength of X-rays. Sunlight contains UV radiation, which makes up around 10% of the Sun's overall electromagnetic radiation output. Electric arcs and specialty lighting, such mercury-vapor lamps, tanning lamps, and black lights, can also produce it. Long-wavelength UV can trigger chemical reactions and make many things light or fluoresce even though it is not thought of as an ionising radiation since its photons lack the energy to ionise atoms.
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If the density of a piece of an object is 2.16 g/cm³, will the item float or sink in pure water?
Answer:
sink
Explanation:
Answer: It will sink
The object has density of 2.16 g/cm³
water has a density of 1 g/cm³
since the density of the object is higher than that of water, it will sink.
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In gases, the particles travel quickly in all directions and regularly collide with one another and the container wall. The particles acquire more kinetic energy and accelerate with rising temperature.
What are gas particles ?There is not much attraction between the particles in a gas. In comparison to the particles in a solid or liquid, they are extremely widely apart and are always moving. The particles simply strike and bounce off of one other when they collide, without engaging in any interaction.
There is no regular structure and the particles in a gas are well separated. Despite having no regular arrangement, fluids are close to one another. Typically in a regular pattern, solids are densely packed.Learn more about Gas particles here: https://brainly.com/question/16982523
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boyle’s law states that when a sample of gas is compressed at a constant temperature, the product of the pressure and the volume remains constant: . find the rate of change of volume with respect to pressure\
The rate of change of volume with respect to pressure dP/dV = -C/P^2
What is Boyle's law?
Boyle's law is a gas law that states the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to the volume it occupies. The gas law states that the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to its volume.
In accordance with Boyle's law When the temperature remains constant, the relationship between pressure and volume is inversely proportion
P ∝ 1/V
PV = C
V= C/P
Boyle's law stipulates When the temperature is constant, pressure is inversely proportional to volume.
dP/dV = -C/P^2
Hence, this is the rate of volume change relative to pressure.
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Elemental silicon can be produced by the reduction of silicon
dioxide in an electrical arc furnace with carbon:
calculate the yield:
Si0, + C - 2C0 + Si
SiC + 2CO = Si02 + 3C (7).
2C + SiO = 2C + CO (8). A typical submerged-arc furnace process involves adding a nearly stoichiometric mixture of silica and carbon.
How do we figure out yield?
You may get the percent yield using the following formula to express the effectiveness of a reaction: Yield percentage is calculated as (actual yield/theoretical yield) multiplied by 100. A 90% percent yield means that 10% of the resources were lost and that the reaction was 90% efficient (they failed to react, or their products were not captured).
Divide the theoretical yield by the experimental yield. Calculate the percent yield by multiplying this value by 100.
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enough of a monoprotic acid is dissolved in water to produce a 1.16 m solution. the ph of the resulting solution is 2.73 . calculate the ka for the acid.
The acid dissociation constant (Ka) for the acid is calculated to be 2.9 × 10^-6 M if the pH of the resulting solution is 2.73
The acid dissociation constant (Ka) is used to differentiate between weak and strong acids and in this case, can be calculated as follows;
Considering the chemical reaction:
HA ⇄ H⁺ + A⁻
Here HA is the acid that disassociates into the conjugate base of the acid (A⁻) and a hydrogen ion represented as H⁺
As the molarity of monoprotic acid is 1.16 M and the pH of the solution is 2.73, therefore;
[A⁻] = [H⁺] = 10^(-2.73)
[A⁻] = [H⁺] = 0.00186 M; equilibrium concentration
[HA] = 1.16 M - 0.00186 M
[HA] = 1.15814 M
Ka = [A⁻][H⁺] / [HA]
Ka = (0.00186)² / 1.15814 M
Ka = 2.9 × 10^-6 M
Therefore the Ka for the acid is calculated to be 2.9 × 10^-6.
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Is copper chloride a solid or a gas?
Answer:
solid
Explanation:
I’ll give you a lot of points for this
Calculate the number of joules giving off 32.0 g of steam cool from 110.0°C to ice at -40.0°C
Pls show work
In the CGS and S.I systems, the units of energy erg and joule are equivalent.
The symbols for joule and erg are (kg m2/s2) and (g cm2/s2), respectively.
110 + 40 = 150
150*32 = 4800 °C
What is Joules ?The International System of Units uses the joule as its unit of energy. It is equivalent to the amount of labor required to move a mass one meter in the direction of an applied newton of force.
The joule (J), which equals one newton metre, is the SI unit for energy (N m).
The work (or energy expended) by a force of one newton (N) operating over a distance of one meter is equivalent to one joule (m). A force of one newton causes a mass of one kilogram (kg) to accelerate by one meter per second (s) per second. So, one joule is equivalent to one newton meter.
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Which of these is an example of conclusion?
- Add different kinds of soil to three potted plants
- beach erosion increased during the last winter storm
- temperature changes may be due to wind patterns
- wonder why some layers of rocks contains fossils
Answer: C
Explanation:can’t be A starts with a word that begins in a intro can be b those are textual evidence can’t be D also referring to textual evidence in a first pattern of a end RACE or PEMDOS
Why are total solar eclipses rare as compared to the total lunar eclipse?
Answer:
Earth casts a much larger shadow on the Moon during a lunar eclipse than the Moon casts on Earth during a solar eclipse
Explanation:
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2) Choose the appropriate tool for the situation. volume of a cube. (1 anemometer) (2 graduated cylinder) (3 thermometer) (4 petri dish)
the appropriate tool for the situation. volume of a cube is graduated cylinder
A popular piece of scientific equipment used to measure the volume of a liquid is a graduated cylinder, sometimes referred to as a measuring cylinder or mixing cylinder. Its form is slender and cylindrical. The measured liquid amount is indicated by each marked line on the graduated cylinder. An item of laboratory equipment known as a measuring cylinder, graduated cylinder, cylinder measurement, or mixing cylinder is used to measure the amount of liquids, chemicals, or solutions during routine lab work. Compared to standard laboratory flasks and beakers, graduated cylinders are more exact and accurate.
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look at the periodic table. each horizontal row shows a... what is the missing word?
Answer:
Groups
Explanation:
groups are located horizontally
Which of the following illustrates how we can miss things even if they are clearly visible?
a. Inattentional blindness
b. Illusory conjunctions
c. Change blindness
d. Binding
A. Inattentional blindness is how we can miss things even if they are clearly visible.
Inattentional blindness is failing to see objects when our attention is directed elsewhere.
A person experiences inattentional blindness or perceptual blindness (occasionally referred to as inattentive blindness) when they are unable to recognize an unexpected stimulus that is right in front of them without the aid of vision problems or deficiencies.
We all occasionally suffer from inattentional blindness, which might occur in the following circumstances: You believe you are paying attention to the road, but you miss the automobile swerving into your lane of traffic because you were distracted, which leads to a collision. You are taking in a historical drama with a Greek setting.
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MnO2 + 4HCl = Cl2 + MnCl2 + 2H20How many moles of HCl will react with 4.50 moles of MnO2
Since we have been given the balanced reaction, we can just follow the stoichimetry of the reaction to calculate it.
By the stoichimetry, 1 mol of MnO₂ reacts with 4 moles of HCl. using Rule of three, we have:
1 mol MnO₂ --- 4 mol HCl
4.50 mol MnO₂ --- x
[tex]\begin{gathered} \frac{1mol}{4.50mol}=\frac{4mol}{x} \\ x=(\frac{4.50\cdot4}{1})mol \\ x=18mol \end{gathered}[/tex]So, 18 moles of HCl will react with 4.5 moles od MnO₂ (assuming complete reaction).
6 of 106 of 10 Items
07:48
Above is an example of a food chain or pyramid. Ultimately, either directly or indirectly all organisms on this food chain get their energy from what single source?
A The earth.
B The snakes.
C the Plants.
D The sun.
Answer:
D
Explanation:
Plants manufacturer food through photosynthesis which depends on sunlight
Choose the object which will have the most momentum.
A baseball with a mass of 150 g and a soccer ball with a mass of 450 g are both thrown with a force of 5 m/s.
A: baseball
B:Soccer ball
The momentum of a soccer ball will be greater than the momentum of a baseball.
What is momentum?The momentum of an object can be defined as the function of the mass of the object and its velocity. Momentum (p) can be measured as the kinetic energy of the object and is the multiplication of mass (m) and velocity (v).
The mathematical equation to determine the momentum of an object is equal to:
p = m×v
The momentum is the conserved quantity and will be zero if the object is steady and its velocity of an object is zero.
Given, the mass of the baseball, m = 150g = 0.15 Kg
The velocity of the baseball, v = 5 m/s
The momentum of the baseball will be equal to :
p = 0.15 ×5
p = 0.75 Kg.m/s
The mass of the soccer ball, m = 450g = 0.45 Kg
The velocity of the soccer ball, v = 5 m/s
The momentum of the soccer ball will be equal to :
p = 0.45 ×5
p = 2.25 Kg.m/s
Therefore, the momentum of the soccer ball is greater.
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A scientist wants to determine the effect of fertilizer on plant growth. She plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the growth of the corn over the course of 5 months and measures the height of the plants in centimeters. Row 1 increased in height by 28.1 cm. Row 2 increased in height by 13.4 cm.
What should the scientist conclude from this experiment?
A Fertilizer has no effect on the corn’s growth
B The reason for Row 1’s increase in height cannot be determined
C Row 2 didn’t grow as high because it needed more light
D Fertilizer helps increase corn’s height
Answer:
Correct answer is option D.
Explanation:
As we know when we are doing experiments we have a group or groups where we will be testing our treatment and one that will have the same conditions but without treatment, so we can compare groups, the present case is no exception, the control group is row 2 and the test subject row 1, there is difference between rows, to be sure that the fertilizer has an effect, we could do a statistical test, however, the preliminary results show a difference, so we can say that the correct answer is option D.
what mass of calcium carbonate (in grams) can be dissolved by 4.1 g of hcl ? ( hint : begin by writing a balanced equation for the reaction between hydrochloric acid and calcium carbonate.)
Mass of calcium carbonate (in grams) can be dissolved by 4.1 g of Hcl is 5.62g.
What is balanced equation?A balanced equation is one for a chemical reaction in which the overall charge and the number of atoms for each component are the same for both the reactants and the products. In other words, the mass and charge of both sides of the reaction are equal.
The reaction between calcium carbonate and hydrochloric acid can be expressed through the chemical reaction,
CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂
Hydrochloric acid has a molecular weight of 36.45 g/mol compared to calcium carbonate's molecular weight of 100 g/mol. According to the equation above, 72.9 g of hydrochloric acid may dissolve 100 g of calcium carbonate.
x = (4.1 g HCl)(100 g CaCO3 / 72.9 HCl)
x = 5.62 g.
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A chemical reaction between X2 (red) and Y2 (blue) produces XY (red-blue). All compounds are in a gaseous state and each molecule represents 0.10 bar of that reactant or product. The picture shown here represents the equilibrium mixture.
There are six blue-blue clusters composed of two fused blue spheres, three red-red clusters composed of two fused red spheres, and seven red-blue clusters composed of a red sphere fused with a blue sphere.
Calculate the equilibrium constant for this reaction
The equilibrium constant for this reaction is 1.65.
Solution:
X2: 3, Y2: 6, XY: 7
X₂ + Y₂ ⇌ 2XY
Kc = [XY]² / [X₂][Y₂] = [7]²/[3][6] = 2.72
1mole of equation √(2.72) = 1.65
The equilibrium constant of a chemical reaction is the value of the reaction quotient in chemical equilibrium the state to which a dynamic chemical system approaches when, after sufficient time, its composition exhibits no further measurable tendency to change. Q is the quantity that changes as the reaction system approaches equilibrium. K is the numerical value of Q at the end of the reaction when equilibrium is reached.
Balance Example A book on a table. A car that moves at a constant speed. A chemical reaction in which the forward and reverse kinetics are equal. The specific rate constant k is a constant of proportionality that relates reaction rate to reactant concentration. The rate laws and specific rate constants of chemical reactions must be determined experimentally. The value of the rate constant is temperature dependent.
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Vinegar (assume a pH ~4) contains __________times as many H+ ions as pure water (assume a pH ~7)
Based on its pH value, vinegar contains 1000 times as many H⁺ ions as pure water.
The pH value of a solution is a negative decimal logarithm of its concentration of H⁺ (or H₃O⁺, hydronium ions). This means that the concentration of H⁺ ions in vinegar is 1 * 10⁻⁴ M, while in water it is equal to 1 * 10⁻⁷ M.
Obviously, the concentration is higher in vinegar, and to calculate just how many times higher, we divide it by the concentration in water:
1 * 10⁻⁴ M / 1 * 10⁻⁷ M = 1 * 10³
1 * 10³ = 1000
So, the concentration of H⁺ is 1000 times higher in vinegar than it is in water.
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I give you 20 pts if you can help me out, thx ahead of time, its really appreciated :3
Restate Rutherford's hypothesis and describe how you tested it.
Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.
What is Rutherford's gold foil experiment?Rutherford's gold foil experiment is defined as the positive-charged alpha particles struck a piece of gold foil. Most alpha particles passed through unharmed it has been observed that electrons are revolving around the nucleus.
Rutherford reasoned that the mass of the atom was distributed across the atom if Thomson's model was accurate.
Thus, Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.
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Part D: Challenge
An unknown mixture is set in a beaker on the teacher's table. Describe the five different parts of the
mixture and how we can separate it.
Separation techniques include handpicking, threshing, winnowing, and sieving, Evaporation, Distillation.
Sedimentation or Filtration, Filtering Funnel.
How to seperate differenent types of mixture in a beaker :Key ideas and a summary Using techniques like evaporation, distillation, filtration, and chromatography, which employ variations in the components of a mixture's physical qualities to separate them, mixtures can be physically separated.
Sedimentation, filtration, crystallization, distillation, diffusion, panning, magnetic separation, and adsorption are a few of the methods used to separate materials. A substance is said to be pure when a sample of it has been purified of all other types of material.To know more about Seperatation of mixture please click here ; https://brainly.com/question/11859222
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Consider the following reaction and its equilibrium constant:
I2(g) + Br2(g) ⇌ 2 IBr(g) Kc = 1.1 × 10^2
A reaction mixture contains 0.49 M I2, 0.28 M Br2 and 3.5 M IBr. Which of the following statements is TRUE concerning this system?
a. The reaction quotient will decrease.
b. The reaction will shift in the direction of products.
c. The equilibrium constant will increase.
d. The reaction will shift in the direction of reactants.
e. The system is at equilibrium
Statement b) is true concerning this system. This conclusion can be reached by comparing the reaction quotient and the equilibrium constant.
To determine which is the correct answer (except c, which is obviously incorrect, the equilibrium constant isn't dependent on the concentrations of the reaction components), we need to calculate the reaction quotient (Q) and compare it to the equilibrium constant (K).
The expression for the equilibrium constant (and the reaction quotient) looks like this:
[tex]Q = \frac{[IBr]^{2} }{[I_{2} ][Br_{2} ]}[/tex]
Q = (3.5 M)²/(0.28 M * 0.49 M)
Q = 89 = 0.89 x 10²
This means that the reaction quotient is lower than the equilibrium constant (so the system is not at equilibrium, making option e) incorrect), which means that it will shift in the direction that will cause it to be equal to reach equilibrium. So, the reaction quotient will increase (making option a) incorrect) and the system will shift towards the product because increasing the concentration of the product and reducing the concentrations of the reactants.
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If a gas at 293.0 K occupies 4.60 liters at a pressure of 3.00 atm, what will be its volume at a pressure of 4.50 atm?
a
3.07 L
b
2.93 L
c
6.90 L
d
4.72 L
There are so many gas laws like Charles's law, Avogadro’s law and many more, out of which Boyle's law is one of the most important law among all gas laws. The volume of gas at 4.50atm is 3.06 liters
What is Boyle's law?
According to Boyle's law pressure is inversely proportional to volume at constant Temperature. It is applicable only on the ideal gases. Since temperature is constant here, we can apply this law
Mathematically
[tex]P_{1} V_{1} =P_{2} V_{2}[/tex]
[tex]P_{1}[/tex]= 3.0atm
[tex]V_{1}[/tex]=4.60liters
[tex]P_{2}[/tex]=4.50atm
[tex]V_{2}[/tex]=unknown pressure
Putting all values
(3.00 atm×4.60 liters)÷4.50atm=[tex]V_{2}[/tex]
3.06 liters=[tex]V_{2}[/tex]
Thus the volume of gas at 4.50atm is 3.06 liters
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