3. Where are gastropods found? Choose all the correct answers.
A) on land
OB) in salt water
OC) in fresh water
OD) all of the above
O E Maastropods are extinct
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Answer:

Salt is cubed, crystal like, grainy, and shiny

Explanation:

Answer:

salt is basic in nature

it is of diffrent type

they are of 4 type

1 is sodium hydroxide

2 is bleaching powder

3 is baking soda

4 is washing soda

The bactericidal activity of sanitizers prepared from the water will be reduced if the hardness or pH of the water used to prepare EO water or bleach solutions are increased.

Temperature, pH, relative humidity, and water hardness are other physical and chemical variables that affect disinfection processes. For instance, most disinfectants become more active as the temperature rises, but there are some exceptions.

The harder your water is, the less effective cleaning products will be since it will be difficult to make a soapy lather. Scale, which are crusty deposits made by hard water, can build up in your dishwasher or washing machine. Detergent works effectively when used with soft water.

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Answer:

Someone probably touched chemicals and got hurt / burnt

Explanation:

Got asked this question a while back

Answer:

288 g/mol

Explanation:

What is diffusion?

• It is a process whereby the random motion of particles move from a region of higher concentration to a region of lower concentration.

Graham's law of diffusion of gas

• states that at constant conditions of temperature and pressure, the rate of diffusion of gases is inversely proportional to the square root of their molar masses

\(\boxed{ \frac{Rate_1}{Rate_2} = \sqrt{ \frac{M_2}{M_1} } } \)

Calculations

Oxygen exist as O₂ at room temperature, thus its molar mass is 2(16)= 32.

Let the rate of O₂ be Rate₁, while the rate and molar mass of the unknown gas be Rate₂ and M₂ respectively.

Since O₂ diffuses 3 times as fast as the unknown gas,

Rate₁= 3(Rate₂)

\(\frac{Rate_1}{Rate_2} = 3 \)

\( 3 = \sqrt{ \frac{M_2}{32} } \)

\( \sqrt{ \frac{M_2}{32} } = 3\)

Square both sides:

\( \frac{M_2}{32} = 3^{2} \)

\( \frac{M_2}{32} = 9\)

Multiply both sides by 32:

M₂= 9(32)

M₂= 288

Answer:

A

Explanation:

Which technique would you choose for producing a polymer acrylonitrile.

A

Answer:

UV/Vis spectroscopy is routinely used in analytical chemistry for the quantitative determination of different analytes, such as transition metal ions, highly conjugated organic compounds, and certain biological macromolecules. Measurement is usually carried out in solution.

Explanation:

To predict the spontaneity of an oxidation-reduction reaction, we can use the concept of redox potentials.

Each oxidation and reduction half-reaction has an associated redox potential, which is a measure of the tendency of the reaction to occur. The difference between the redox potentials of the oxidation and reduction half-reactions is called the cell potential (Ecell) and is a measure of the overall tendency of the reaction to occur.

If the Ecell value is positive, then the reaction is spontaneous (i.e., it will occur without the need for external energy input). If the Ecell value is negative, then the reaction is non-spontaneous (i.e., it will not occur without the input of external energy).

We can predict the Ecell value of an oxidation-reduction reaction using the Nernst equation:

Ecell = E°cell - (RT/nF) * ln(Q)

where E°cell is the standard cell potential (i.e., the cell potential under standard conditions), R is the gas constant, T is the temperature, n is the number of electrons transferred in the reaction, F is Faraday's constant, and Q is the reaction quotient (which depends on the concentrations of the reactants and products).

If the calculated Ecell value is positive, then the reaction is spontaneous, and if it is negative, then the reaction is non-spontaneous.

Daria had some beach sand with her. The sand has a 72 gramme mass. She calculated the volume using the graduated cylinder below. The graduated cylinder contains 15 mL of sand.

The volume of the sand is calculated using the graduated cylinder below. The sand's bulk is specified as 72 grammes.

We can use the water displacement method to calculate the volume of the sand. Following is a description of how to estimate the amount of sand using the water displacement method:

The graduated cylinder of water should first be measured for volume.

The graduated cylinder's water volume should then be measured after adding the sand to it. The volume of water increases by the same amount.

Let's use the provided problem to implement this approach.

In the beginning, there is 10 mL of water in the graduated cylinder. The graduated cylinder contains 25 mL of water once the sand has been added.

The amount of sand is therefore equal to the difference between the two volumes, which is: Sand volume equals final water volume minus initial water volume (25 - 10 = 15 mL).

As a result, there are 15 mL of sand in the graduated cylinder.

Answer : 15

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Answer:

iodine

Explanation:

In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict's reagent can be used to test for glucose.

Answer:

In physics, motion means a continuous change in the position of a body relative to a reference point, as measured by a particular observer in a particular frame of reference.

Explanation:

A)Nuclear fusion releases protons and neutrons, so the total number of protons and neutrons in a star changes throughout its life is the true statement.

A suggested method of producing energy would use heat from nuclear fusion processes to produce electricity. A heavier atomic nucleus is created by the fusion of two lighter ones, which also produces energy. Fusion reactors are devices created to use this energy.

Nuclear fusion is less risky than nuclear fission because the fuel rods produced by nuclear fission include dangerous radioactive waste that may be used in weapons and must be maintained carefully for thousands of years.

Powering the Sun and other stars are nuclear fusion processes. Two light nuclei combine to produce one heavy nucleus during a fusion process. The resultant single nucleus's total mass is less than the mass, which causes the process to release energy.

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We are given:

Density of Olive oil = 0.92 g / mL

Mass of 20 mL Olive oil:

We know that the density = 0.92 grams / mL

multiplying the numerator and the denominator by 20

Density = 0.92 * 20 grams / 20 mL

Density = 18.4 grams / 20 mL

So, we have 18.5 grams in 20 mL of Olive oil

Volume of 20 grams Olive oil:

We need to multiply the numerator and the denominator of density by a number, that when multiplied by 0.92 will give 20

let that number be x:

0.92 * x = 20

x = 20/0.92

x = 21.74 (approx)

Multiplying the numerator and the denominator by x:

Density = 0.92 grams / 1 mL

Density = 0.092 * 21.74 / 21.74 mL

Density = 20 grams / 21.74 mL

So, we can see that 20 grams of the oil will have the volume 21.74 mL

CALCULATION OF DENSITY:

Density = mass (g) ÷ volume (mL)

The density of olive oil is given as: 0.92g/mL

QUESTION 1:

Mass = density × volume

Mass = 0.92g/mL × 20

Mass of olive oil = 18.4grams.

QUESTION 2:

Volume = mass ÷ density

Volume = 20 ÷ 0.92

Volume of olive oil = 21.74mL

Therefore;

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Answer:

Octet rule: A rule stating that atoms lose, gain, or share electrons in order to have a full valence shell of 8 electrons. (Hydrogen is excluded because it can hold a maximum of 2 electrons in its valence shell. )

Electron shell: The collective states of all electrons in an atom having the same principal quantum number (visualized as an orbit in which the electrons move).

Explanation:

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Answer:

2.13 V

Explanation:

The balanced equation of the reaction his;

2Cr^3+(aq) + 3Ca(s) -----> 2Cr(s) + 3Ca^2+(aq)

Since this is a galvanic cell then E°cell must be positive. It implies that calcium will be the anode and chromium will be the cathode since calcium is ahead of chromium in the electrochemical series.

E°anode= -2.87 V

E°cathode= -0.74 V

E°cell= E°cathode -E°anode

E°cell= -0.74 -(-2.87)

E°cell = 2.13 V

Answer:

d

Explanation:

Balancing a chemical equation is the process of ensuring that the number of atoms of each element in the reactants is equal to the number of atoms of that same element in the products.

Balance the chemical eqations given in the problem?

Chemical equations are used to describe the reactants and products in a chemical reaction. These equations are written using chemical formulas and symbols, indicating the types and numbers of atoms or molecules involved in the reaction. However, these equations must be balanced to obey the law of conservation of mass, which states that the total mass of the reactants must equal the total mass.

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There are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

To determine the number of water molecules in the given volume of water, we need to use the relationship between mass, volume, and molar mass of water.

First, we need to find the mass of water in the bottle:

Mass = Density * Volume

Mass = 0.967 g/mL * 499.8 mL = 483.9 g

Next, we need to convert the mass of water to moles using the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Moles = Mass / Molar mass

Moles = 483.9 g / 18.015 g/mol = 26.88 mol

Finally, we can calculate the number of water molecules using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules = Moles * Avogadro's number

Number of molecules = 26.88 mol * (6.022 x 10^23 molecules/mol) = 1.62 x 10^25 molecules

Therefore, there are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

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Answer:

It would most likely just change their color

Explanation: The frequency of dark-coloured moths increased at that time, an example of industrial melanism. Later, when pollution was reduced, the light-coloured form again predominated. ... The dark-coloured or melanic form of the peppered moth

If pollution near factories was reduced, then this situation increased the frequency of white moths.

Industrial melanism is an evolutionary feature associated with the increase of dark moths in industrial polluted areas.

In conclusion, if pollution near factories was reduced, then this situation increased the frequency of white moths.

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Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

Explanation:

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities.

Answer:

heating, thermal

Explanation:

the more molecules present, the greater amount from any given source increases the temperature as well as the thermal energy.

Answer:

Your answer is correct based on what I remember from AP Chemistry  

Explanation:

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

C

Explanation:

You can’t round a phone number or Pin code

why would you round your birth year?

Explanation:

I have a dog in my dog is a girl

Answer:

me

Explanation:

I'm a girl and I have a RIDE skele-rex and a ride cerberus and a n f r GRIFFIN and a f r gold rat and a normal unicorn a RIDE kitsune

A series of concentric circles make form the geometric shape known as the annulus. Each circle has the same radius, and there is an equal distance between them. Both the size of a circular region and the circumference of the circle can be determined using the annulus.

An animal or plant's annulus is a ring-shaped structure. The portion of the stem that holds the leaves in place on plants is known as the annulus. The stem's annulus, which similarly shrinks to let the plant move, is another example of this. The portion of the skeleton that encircles the spinal cord in animals is known as the annulus. The annulus helps to maintain the body upright while safeguarding the spinal cord.

A new ring is built on a molecule via the chemical reaction known as annulation in organic chemistry. Helicenes and acenes are two examples of side-on condensed cyclic segments that are used to build annular molecules.

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The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.

The nitro group is a powerful electron withdrawing group. As a result, by removing electron density from the carboxylate ion, it increases the acidity of benzoic acid. This effect is strongest when the nitro group is in the ortho position (the effect is known as ortho effect).

The chemical structure of an acid can be used to predict its relative strength. An acid is generally stronger when the H-A bond is more polar. When the H-A bond is weaker and the conjugate base, A, is more stable, acidity increases.

Thus, The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.

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Moles of O_2

No of atoms

Note the formula

\(\boxed{\sf No\:of\:atoms=No\:of\:moles\times Avagadro\:no}\)

Find no of moles

\(\\ \tt{:}\dashrightarrow \dfrac{8.78g}{32g/mol}\)

\(\\ \tt{:}\dashrightarrow 0.27mol\(

No of atoms

\(\\ \tt{:}\dashrightarrow 0.27\times 6.023\times 10^{23}\)

\(\\ \tt{:}\dashrightarrow 1.6\times 10^{23}atoms\)

Explanation:

well I'm not 100% sure but I studied a little bit with rocks and crystals I've noticed that the hotter the temperature are it does not matter if it is Obsidian the hotter it is the more shinier it will become so the texture of it has to be a right temperature to be able to create a different texture such as a diamond and a diamond has to be compressed so hard that it will turn into diamond this is just an explanation please do not take this as a real answer I hope this help you though