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3 years ago

Name 2 properties of enzymes

Chemistry

2 answers:

Jet001 [13]3 years ago

8 0

Solubility, Molecular weight

Lelechka [254]3 years ago

5 0

pepsin is an example of digestive enzyme that is released in the stomach and it breaks down food proteins to peptides.Trypsin is also one that hydoloyzes proteins into amino acids that the body can break down.

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Janel’s class studied properties of matter and how matter can change. Janel decided she would do an experiment mixing baking sod

mafiozo [28]

1. First, identify the physical state of matter of baking soda. Describe another property of baking soda.

Baking soda is composed of sodium bicarbonate which is also named sodium hydrogen carbonate, and it is a chemical compound with the formula NaHCO₃. Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder. It is also a salt composed of a sodium cation (Na⁺) and a bicarbonate anion (HCO₃⁻).

Baking soda is alkaline with a pKa of 10.329. This reagent is used in baking as a leavening agent because when it reacts with acid, carbon dioxide is released causing expansion of the batter.

2. Next, identify the physical state of matter of vinegar. Describe another property of vinegar.

Vinegar is an aqueous solution of acetic acid which is a colourless acid liquid organic compound with the chemical formula CH3COOH and a pKa of 4.756. Vinegar typically contains 5–20% by volume of acetic acid. Usually the acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria. Vinegar also contains numerous flavonoids, phenolic acids, and aldehydes.

Vinegar has a sour taste and a pungent smell because of the acetic acid. This acid determines vinegar’s chemical properties. The pH of vinegar is typically in the range of 2 to 3.5, depending on the concentration of acetic acid, and it has of approximately 0.96 grams per milliliter, depending on its acidity.

3. Then, explain what Janel should see when she mixes the baking soda and vinegar.

When Janel mixes the baking soda with vinegar she will observe the formation of many bubbles in the mixture due to the evolution of carbon dioxide. When these ingredients are mixed, the sodium bicarbonate reacts with the acetic acid to produce carbon dioxide, water and sodium acetate according to the following reaction.

NaHCO₃(s) + CH₃COOH(l) → CO₂(g) + H₂O(l) + CH₃COONa (aq)

The carbon dioxide escapes the solution as bubbles. The bubbles are heavier than air, so the carbon dioxide collects at the surface of the container or overflows it.

4. Describe the states of matter of the new materials that are formed.

After the reaction between baking soda and vinegar, a transparent liquid formed by water and aqueous sodium acetate will be obtained, in addition to the evolution of carbon dioxide, which is a colorless gas at room temperature. However, if an excess of baking soda is added initially, a solid corresponding to the sodium bicarbonate will be observed, which did not react with the acetic acid present in the vinegar.

5. Explain how Janel can be certain a change has occurred.

Janel could make the reaction in a closed container. To make sure that the reaction occurred, Janel could unclog this container and immediately place a phosphor in the hole in it. If carbon dioxide was produced, this gas will extinguish the phosphor flame. Because CO₂ is heavier than air, it displaces it. This starves a fire of the oxygen needed for combustion.

Being that a dilute sodium acetate solution remains after the reaction, Janel could also boiled off this solution to obtained a supersaturated solution of sodium acetate. This will form a "hot ice" that will spontaneously crystallize, releasing heat and forming a solid that resembles water ice.

3 0

3 years ago

A fixed mass of gas has a volume of 92 cm cube and 3 degrees Celsius. What will be its volume at 18 degrees celsius if the press

8090 [49]

Answer:

94.8454

Explanation:

Let volume be V

Let Temperature be T

V1= 92

T1= 3C but to kelvin 273+3= 300K

V2= ?

T2= 18 C but to kelvin 18+273= 291

$\frac{v1}{t1} = \frac{v2}{t2}$

$\frac{92}{300} = \frac{v2}{291}$

$v2 \times 300 = 92 \times 291$

$v2 = \frac{92 \times 291}{300}$

$v2 = 94.8454$

3 0

3 years ago

Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid

bogdanovich [222]

Explanation:

Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H₂O). They will react according to the following equation.

HBr + NaOH ---> NaBr + H₂O

0.81 g of HBr are mixed with 0.568 g of NaOH. We have to find the mass of NaBr that can be produced. To do that we have to find which of the reactants is limiting the reaction. First, we will convert their grams into moles using their molar masses.

molar mass of HBr = 80.91 g/mol

molar mass of NaOH = 40.00 g/mol

mass of HBr = 0.81 g

mass of NaOH = 0.568 g

moles of HBr = 0.81 g * 1 mol/(80.91 g)

moles of HBr = 0.0100 moles

moles of NaOH = 0.568 g * 1 mol/(40.00 g)

moles of NaOH = 0.0142 moles

HBr + NaOH ---> NaBr + H₂O

Now if we take a quick look at the coefficients of the reaction we will see that 1 mol of HBr will react with 1 mol of NaOH since both coefficients are 1. Then their molar ratio is 1 : 1. That also means that 0.0100 moles of HBr will only react with 0.0100 moles of NaOH, and we have mixed 0.0142 moles of it. So, NaOH is in excess and HBr is the limiting reagent.

1 mol of HBr : 1 mol of NaOH molar ratio

moles of NaOH = 0.0100 moles of HBr * 1 mol of NaOH/(1 mol of HBr)

moles of NaOH = 0.0100 moles < 0.0142 moles ----> NaOH is in excess

And now that we know that HBr is the limiting reagent we can find the number of moles of NaBr that will be produced by 0.0100 moles of HBr. And finally convert those moles into grams using the molar mass.

1 mol of HBr : 1 mol of NaBr molar ratio

moles of NaBr = 0.0100 moles of HBr * 1 mol of NaBr/(1 mol of HBr)

moles of NaBr = 0.0100 moles

molar mass of NaBr = 102.89 g/mol

mass of NaBr = 0.0100 moles * 102.89 g/mol

mass of NaBr = 1.0289 g

mass of NaBr = 1.0 g

Answer: the maximum mass of sodium bromide that could be produced is 1.0 g.

7 0

1 year ago

Please help! i will mark as brainliest

beks73 [17]

Answer:

Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy.

Explanation:

8 0

2 years ago

Read 2 more answers

Determine the concentration of a solution prepared by diluting 25.0 ml of a stock 0.188 m sr(no3)2 solution to 150.0 ml

o-na [289]

We can use the following equation to calculate the concentration of diluted solution.
c1v1 = c2v2
where c1 is concentration and v1 is volume of stock solution, which is the more concentrated solution.
c2 is concentration and v2 is the volume of diluted solution.
substituting the values in the equation,
0.188 M x 25.0 mL = c2 x 150.0 mL
c2 = 0.0313 M
concentration of diluted solution is 0.0313 M

8 0

3 years ago