Tea contains various acidic organic molecules called tannins. Given that, why is it helpful to us na2co3 in this experiment?.

Answer:

The faster the object falls the greater the air resistance. Terminal velocity is reached when the force due to air resistance (upward) equals the force due to gravity (downward). At terminal velocity there is no net force and therefore no further acceleration.

Combined gas law states that when the number of moles of an ideal gas are held constant, the volume and pressure of the gas are inversely proportional while being directly proportional to temperature.

Under combined gas law, the three (3) main gas laws are combined together and these include:

Mathematically, the combined gas law is given by the formula:

\(\frac{PV}{T} =k\\\\\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

Where:

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Biodiesel has decreased emission of atmospheric carbon than fossil fuels due to the presence of oxygen molecules.

Biofuels have lower carbon emissions than burning fossil fuels because oxygen molecules are present in them and help in complete combustion. Carbon in biodiesel is recently present in the atmosphere while carbon in fossil fuels are formed by action of many geological forces on deep layers of earth over many thousands of years so the carbon is preserved and lack the presence of oxygen.

Fossil Fuels are Hydrocarbons which release Carbon Dioxide on burning. The Carbon recently present in atmosphere is extracted in Biofuels so this cause no net Change in Carbon levels in atmosphere.

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The basic unit of measurement, based on the metric system, that is the amount of enzyme activity that converts 1 mole of a substrate per second is called a katal (kat).

The katal is a unit of measurement for the catalytic activity of enzymes and is defined as the amount of enzyme activity that catalyzes the conversion of one mole of substrate per second under specific conditions of temperature and pH.

The katal is a more accurate and precise unit of measurement for enzyme activity compared to other units such as the international unit (IU) or the enzyme unit (U), which are based on outdated and imprecise methods of measurement. The use of the katal has been recommended by the International System of Units (SI) since 1978.

The katal is widely used in biochemistry, enzymology, and other fields that involve the study of enzymes. It is important to note that the katal is a measure of the intrinsic activity of the enzyme and does not take into account other factors such as substrate concentration, enzyme stability, or inhibition.

In summary, the katal is the basic unit of measurement, based on the metric system, that is the amount of enzyme activity that converts 1 mole of a substrate per second. It is a more accurate and precise unit of measurement for enzyme activity and is widely used in biochemistry and enzymology.

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Answer:

spheroidal joint

Explanation:

Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.

Explanation :

As we know that Mendeleev arranged the elements in horizontal rows and vertical columns of a table in order of their increasing relative atomic weights.

He placed the elements with similar nature in the same group.

According to the question, the atomic weight of iodine is less than the atomic weight of tellurium. So according to this, iodine should be placed before tellurium in Mendeleev's tables. But Mendeleev placed iodine after tellurium in his original periodic table.

However, iodine has similar chemical properties to chlorine and bromine. So, in order to make iodine queue up with chlorine and bromine in his periodic table, Mendeleev exchanged the positions of iodine and tellurium.

As we know that the positions of iodine and tellurium were reversed in Mendeleev's table because iodine has one naturally occurring isotope that is iodine-127  and tellurium isotopes are tellurium-128 and tellurium-130.

Due to high relative abundance of tellurium isotopes gives tellurium the greater relative atomic mass.

Answer: a. 2 C3H7OH + 9 O2 →  6 CO2(g)  + 8 H2O(g)

b. C6H12O6 + 6 O2 →  6CO2(g)  + 6 H2O(g)

Explanation:

Alcohols and sugars combust or when burned with oxygen forms carbon dioxide and water.

Answer:

m = 50.74 kg

Explanation:

We have,

Initial temperature of water is 20 degrees Celsius

Final temperature of water is 46.6 degrees Celsius

Heat absorbed is 5650 J

It is required to find the mass of the sample. The heat absorbed is given by the formula ad follows :

\(Q=mc\Delta T\)

c is specific heat of water, c = 4.186 J/g°C

So,

\(m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{5650}{4.186\times (46.6-20)}\\\\m=50.74\ kg\)

So, the mass of the sample is 50.74 kg.

Answer:

Yes, water molecules remain the same despite the phase

Explanation:

When water is in the form of ice, it molecules remain the same only the distance between the molecule. This distance is higher than that of the inter molecular distance between liquid water molecules. Due to this reason ice is lighter than water.  

Now in gaseous phase, the intermolecular distance increases thereby making it lighter than solid ice and liquid water.

Mass of water produced is equal to 7.2 grams.

The reactants are reacting according to the following equation:

HBr + NaOH = NaBr + H2O

1 mole of HBr requires 1 mole of NaOH to be totally transformed into NaBr and water.

Now, let us calculate the amounts of HBr and NaOH in mols:

m(HBr) = 67.2g

m(NaOH) = 16g

M(HBr) = 80.9g/mol

M(NaOH) = 40g/mol

Following the simple relation

n(moles) = m(grams)/M(g/mol)

n(HBr) = 67.2g/(80.9g/mol)

n(NaOH) = 16g/(40g/mol)

n(H2O) = n(NaOH) = 0.40 mol, which is:

m(H2O) = n(H2O) x M(H2O)

0.40mol∗18g/mol=7.2g

Finally, the mass of water produced is equal to 7.2 grams.

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Answer:

its false ...............

Answer:

true

Explanation:

- energy can be changed from one form to another but it cannot be created or destroyed

Answer:

= 9.872002 × 10^6

Explanation:

Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is a.

Count how many places you moved the decimal point. This number is b.

If you moved the decimal to the left b is positive.

If you moved the decimal to the right b is negative.

If you did not need to move the decimal b = 0.

Write your scientific notation number as a x 10^b and read it as "a times 10 to the power of b."

Remove trailing 0's only if they were originally to the left of the decimal point.

Answer:

Photoautotrophs

Explanation:

I think you mean "autotroph"

The answer is photoautotrophs. they use sunlight to make their food

Don't forget to rate the answer for others

Answer:

Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.

Explanation:

hope it helps U

Answer:c

Explanation:

I put a and got it wrong and c was correct

J.J. Thomson gave the plum pudding model for the atomic structure. The model represents the plums by electrons and pudding as large positively charged masses. Thus, option c is correct.

The Plum pudding model was given by J.J. Thomson to represent the sub-atomic particles of the atom and their distribution. The plum was used to depict the electrons that carried a negative charge.

The pudding represented the protons that were present like the sea and covered the whole atom. The protons carried a positive charge and according to the model were distributed fully in the atom.

It was an important discovery and model that gave rise to more accurate models. The model proposed the presence of the electrons that later were considered of crucial importance.

Therefore, option c. the plum is electron embedded in the pudding of the protons.

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Answer:

ether

Explanation:

i got it right on edg 2020 and they use ether in pokemon games to heal PP so that makes logical sense lol

The class of organic compounds that are used in anesthetics is:

A. Ether

It is a functional group consisting of C and O.

Anesthetics are an assorted gathering of medications with especially unique synthetic designs, going from basic inorganic atoms like nitrous oxide to additional perplexing natural specialists.

Organic compound is one that contains a bond with a carbon particle. In ethers, the practical gathering that is available is C=O. Ether, as a fluid, discharges fumes that are breathed in. Another very powerful fluid sedative is propofol, controlled intravenously.

Thus, correct option is A.

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Answer:

True

Explanation:

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

IF HELPED MARK AS BRAINLIEST

Answer:

For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.

Answer:

The mass of one mole of a substance is equal to that substance's molecular weight. ... water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams. ... Avogadro's number is a proportion that relates molar mass on an atomic ... one molecule of water (H2O), one mole of oxygen (6.022×1023 of O atoms)

Explanation:

my answere is drought the first option

Answer:
Answer 1: The mass of magnesium contained in the compound is 0.57g, which can be determined by subtracting the mass of the crucible and lid (31.064g) from the mass of the crucible, lid, and magnesium ribbon (31.634g).

Answer 2: The mass of oxygen contained in the compound is 1.39g, which can be determined by subtracting the mass of the crucible, lid, and magnesium oxide (31.970g) from the mass of the crucible and lid (31.064g).

Answer 3: The change in mass between the two can be accounted for by the reaction of the magnesium with oxygen to form magnesium oxide.

Answer 4: The number of moles of magnesium is 0.0995 (2.39/24) and the number of moles of oxygen is 0.0868 (1.39/16). Dividing the moles of each element by the smallest amount of moles (0.0868) results in a simplest ratio of 1:1. Therefore, the empirical formula of magnesium oxide is MgO.

Answer 5: The known formula for magnesium oxide is MgO, which is the same as the empirical formula determined in question 4.

Answer: B is the answer

Explanation:I just answered

Answer:

53 meters = 53000 millimeters

Explanation:

In this question we have to convert meters into millimeters .

By metric conversion,

Since, 1 meter = 1000 mm

Therefore, 53 meters = 53 × 1000

                                  = 53000 millimeters

53 meters = 53000 millimeters is the answer.

The compounds which will ionize in water include the following:

This is defined as the separation of a chemical's molecules into positive and negative ions.

The compounds which undergo ionization in water are seen above and is the most appropriate choice.

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Answer:

Explanation:

mass of aluminum 2.8 kg = 2.8 x 1000 = 2800 g

ρ = density of aluminum given = 2.7 g / cm³

density = mass / volume

volume = mass / density

= 2800 / 2.7

= 1037 cm³

So volume of cube required = 1037 cm³.