A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at37°C. The student repeated the investigation five times
Figure 11 shows the results
time taken for amylase to produce glucose (s)
Test 4
120
125
110
115
Figure 11
() Calculate the rate of amylase enzyme activity for the 10% starch solution.
Answers
Answer:
Phenolphthalein is an indicator. It is pink in alkaline solutions and turns colourless as the pH decreases.
It can be used to measure the activity of the enzyme lipase on the breakdown of lipids.
Samples of milk containing phenolphthalein were incubated with lipase at different temperatures.
The time taken for the phenolphthalein to turn colourless was recorded and used to calculate the rate of enzyme activity.
Figure 10 shows these results.
Picture
(a) (i) Explain why phenolphthalein turns colourless when lipase breaks down the lipids in milk. (2)
(ii) Describe the effect of temperature on the activity of lipase, as shown in Figure 10. (2)
(iii) Explain why the activity of lipase changes above a temperature of 40°C. (2)
(b) A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at 37°C. The student repeated the investigation five times.
Final answer:
To calculate the rate of amylase enzyme activity for the 10% starch solution, divide the time taken for amylase to produce glucose by the total time elapsed. For each test, this rate can be expressed as the number of glucose molecules produced per unit of time.
Explanation:
The rate of amylase enzyme activity for the 10% starch solution can be calculated by determining the time taken for amylase to produce glucose. In this investigation, the time taken for amylase to break down the starch solution into glucose was recorded in seconds. To find the rate, divide the amount of glucose produced (in this case, the time taken) by the total time elapsed. For example, for Test 4, the time taken was 120 seconds. The rate of amylase enzyme activity can then be expressed as 1 glucose molecule produced per 120 seconds.
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At what temperature will the following reaction happen spontaneously, given that ΔH=8.91×103J and ΔS= –219.20 J/K? CaSO4(s) + 2HCl(g) → CaCl2(s) + H2SO4(l)A) at 298 K B) at 100 K C) It is spontaneous at any temperature. D) It is not spontaneous at any temperature.
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Answers
Explanation:
ionisation energy decrease down the group as the atomic radius increases. Nuclear charge increases. Number of shell increases so the electron will experience more shielding so it would be easier for the atom to loss electron.
Final answer:
The atomic radius increases as you move down a group from Li to Cs, while the atomic radius generally decreases as you move across a period from Li to Cs. The ionization energy decreases down a group and increases across a period.
Explanation:
The atomic radius is the size of an atom, while ionization energy is the energy required to remove an electron from an atom. In general, as we move down a group from Li to Cs, the atomic radius increases due to the addition of more energy levels. This is because the electrons occupy higher energy orbitals farther away from the nucleus. On the other hand, as we move across a period from Li to Cs, the atomic radius generally decreases. This is because the effective nuclear charge increases, pulling the electrons closer to the nucleus.
Regarding ionization energy, it generally decreases down a group from Li to Cs. This is because the atomic radius increases, therefore making it easier to remove an electron from a larger, higher energy orbital. Conversely, as we move across a period, the ionization energy generally increases. This is because the atomic radius decreases, and the electrons are held more tightly by the increasing nuclear charge.
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Answers
Answer:
1.6 atm
Explanation:
We are given that total pressure of mixture of two gases=5.7 atm
Partial pressure of one gas=4.1 atm
We have to find the partial pressure of other branch.
We know that Dalton;s law of partial pressure
It states that pressure exerted by mixture of gases is equal to sum of partial pressure exerted by gases in mixture.
Let x bet the pressure exert by other gas
Apply this law
Total pressure=4.1+x
Hence, the partial pressure of other gas=1.6 atm.
Answers
Final Answer:
Three toxicants associated with sewage are heavy metals, organic pollutants, and pathogenic microorganisms.
Explanation:
1. Heavy Metals: Sewage can contain heavy metals such as lead, mercury, and cadmium, which are often discharged into wastewater from industrial processes and urban runoff. These toxic metals can contaminate water bodies, accumulate in aquatic ecosystems, and pose significant health risks to both aquatic life and humans when consumed through contaminated water or seafood.
2. Organic Pollutants:*Sewage also contains a variety of organic pollutants, including pesticides, solvents, and synthetic chemicals. These substances can originate from household products, industrial discharges, and agricultural runoff. Organic pollutants can have adverse effects on aquatic ecosystems by disrupting the balance of the ecosystem, affecting water quality, and harming aquatic organisms.
3. Pathogenic Microorganisms: Sewage is a potential carrier of pathogenic microorganisms such as bacteria, viruses, and parasites. When sewage is improperly treated or discharged into water bodies without adequate disinfection, it can lead to the contamination of drinking water sources and recreational waters, causing waterborne diseases and infections in humans.
Proper sewage treatment and wastewater management are essential to minimize the release of these toxicants into the environment and protect human health and aquatic ecosystems.
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Answer:
Pathogens,Heavy Metal and Organic Chemicals are all three toxicants associated with sewage
12x+6 Solve for x
Answers
Answer:
x = 7
Explanation:
Simplifying
11x + 13 = 12x + 6
Reorder the terms:
13 + 11x = 12x + 6
Reorder the terms:
13 + 11x = 6 + 12x
Solving
13 + 11x = 6 + 12x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-12x' to each side of the equation.
13 + 11x + -12x = 6 + 12x + -12x
Combine like terms: 11x + -12x = -1x
13 + -1x = 6 + 12x + -12x
Combine like terms: 12x + -12x = 0
13 + -1x = 6 + 0
13 + -1x = 6
Add '-13' to each side of the equation.
13 + -13 + -1x = 6 + -13
Combine like terms: 13 + -13 = 0
0 + -1x = 6 + -13
-1x = 6 + -13
Combine like terms: 6 + -13 = -7
-1x = -7
Divide each side by '-1'.
x = 7
Simplifying
x = 7
Answer:Simple and best practice solution for 11x+13=12x+6 equation. ... + 6 Reorder the terms: 13 + 11x = 6 + 12x Solving 13 + 11x = 6 + 12x Solving for variable 'x'.
Explanation:
Answers
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
The answer is:
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Further Explanation
In chemistry, the equation of a reaction or chemical equation is that the symbolic writing of a reaction. The statement of the reagent is written to the left of the equation and so the statement of the merchandise is written to the proper. The coefficient written to the left of a statement could be a stoichiometric coefficient, which describes the quantity of that substance involved in an exceeding reaction relative to a different substance. The reaction equation was first made by the iatrochemist Jean Beguin in 1615. in an exceeding reaction equation, reagents and products are connected by different symbols. The symbol → is employed for one-way reactions, ⇆ for two-way reactions, and ⇌ equilibrium reactions.
The reaction might be an action that always produces interchange of chemical compounds. The initial compounds or compounds involved within the reaction are called reactants. Chemical reactions are usually characterized by chemical changes and can produce one or more products that typically have different characteristics from reactants. Classically, chemical reactions involve changes involving the movement of electrons within the formation and breaking of chemical bonds, although the final concept of chemical reactions can even be applied to the transformation of elementary particles like in nuclear reactions.
Chemical compounds are pure chemicals that encompass two or several elements that will be lessened into its constituent elements by chemical reactions. as an example, dihydrogen monoxide (water, H2O) could be a compound consisting of two hydrogen atoms for every oxygen atom. Generally, this comparison must be fixed thanks to its physical nature, not a comparison made by humans. Therefore, materials like brass, YBCO superconductors, "aluminum gallium arsenide" semiconductors, or chocolate are considered mixtures or alloys, not compounds. The characteristic of compounds is the presence of chemical formulas. The statement provides a ratio of atoms in an exceeding substance, and therefore the number of atoms in an exceedingly single-molecule (therefore the statement of ethene is C2H4 and not CH2. The statement doesn't specify whether the compound consists of molecules; as an example, binary compound (table salt, NaCl) could be a compound ionic.
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Details
Grade: High School
Subject: Chemistry
keywords: chemical equation