a 600. ml beaker has an inner diameter of 88.0 mm. what is the vertical distance between the 100. ml marks on the side of the beaker?

Answer:

7

Explanation:

Two mean unpaired is the type of hypothesis test you should use. If the caloric contents were normally distributed, and that a level of significance of 1% be used you should use two mean unpaired hypothesis test. Option B is correct.

13: Since you have two independent groups (1.5 moles per liter and 2.0 moles per liter), and you want to compare the means of these two groups, you would use a Two mean unpaired hypothesis test. This test compares the means of two independent groups to determine if there is a significant difference between them.

Therefore, Option B is correct.

15: Since you have two independent groups (Type A milk and Type B milk) you would also use a Two mean unpaired hypothesis test.

Therefore, Option B is correct.

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The Celsius temperature on the beach is approximately 35.8 degrees Celsius.

The pressure-temperature relationship is governed by Charles' Law, which states that as long as pressure is constant, the volume of a gas will be directly proportional to its temperature.The equation used to determine the relationship between temperature and pressure is as follows: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature in Kelvin (K).Let's utilize the formula given above to find the temperature of the beach:P1V1/T1 = P2V2/T2We can substitute the values we've been provided to solve for T2 : When the can is at 16 degrees Celsius and 4.5 atm, the pressure is:P1 = 4.5 atmT1 = 16°C + 273 = 289 KV1 and V2, which are the same, can be omitted. P2 = 4.81 atm Substituting these values in the equation : P1V1/T1 = P2V2/T2V1 and V2 are equal and can be eliminated. We can also change the temperature to Kelvin, so:T2 = (P2 * T1 * V1) / (P1 * V2)T2 = (4.81 atm * 289 K) / 4.5 atmT2 = 308.8 KSubtract 273 to convert back to Celsius : T2 = 308.8 K - 273 K = 35.8 degrees Celsius.

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Answer:

it talks about reality ..how animals and human came to existence and how they disappear ..this is evolution

the environment chooses those who best fit in it and others are selected ..as in die ..this is referred to as natural selection

and further in this theory .animals produce off springs who survive in the environment

Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

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Answer:

It is petroleum-derived product comprising a mixture of liquid aliphatic and aromatic hydrocarbons, ranging between C4 and C12 carbon atoms with the boiling range of 30–225°C

Explanation:

Gasoline is a mixture of paraffins, naphthenes, aromatics and olefins.

The correct answer is Carrots and snow peas stir-fried in canola oil which is the perfect combination of foods that provide the best source of omega-3 fatty acids.

Alpha-linolenic acid (ALA), the most prevalent omega-3 fatty acid in the majority of Western diets, can be found in leafy green vegetables, flax seeds and flaxseed oil, vegetable oils, nuts (especially walnuts), and some animal fat, particularly from grass-fed animals.

Omega-3s are nutrients that you can obtain through food or supplements and that support the growth and upkeep of a healthy body. They are essential to the composition of each cell wall you have. They also serve as an energy source and support the functioning of your immune system, heart, lungs, and blood vessels.

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Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.

Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.

The balanced reaction can be given as:

\(\rm 2Mg + O_{2} \rightarrow 2MgO\)

From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.

If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.

The mass of oxygen can be calculated as:

\(\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}\)

Therefore, option B. 64 gm of oxygen are required.

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There are 1000 millimeters in a meter. To convert 161 millimeters to meters, we need to divide by 1000:

161 millimeters ÷ 1000 = 0.161 meters

Therefore, 161 millimeters is equal to 0.161 meters.

Answer:

ions

Explanation:

atoms because of the charge

....................

Answer:

43.2 x 10⁻¹¹

Explanation:

The rate law equation for the reaction is:

Rate = k[CH₃CHO]²

In the table, you are given some of the concentrations and rates. What you are not given is the value of "k". Since you are only given the concentration in Trial 3, you need to know the value of "k" in order to find the rate. To find this value, plug the information from one of the trials into the equation and simplify to find "k".

Rate = k[CH₃CHO]²

2.70 x 10⁻¹¹ = k[2.00 x 10⁻³]²

2.70 x 10⁻¹¹ = k[4.00 x 10⁻³]

6.75 x 10⁻⁶ = k

Now that you know the value of "k", you can use it and the concentration from Trial 3 to find the rate.

Rate =  k[CH₃CHO]²

Rate = (6.75 x 10⁻⁶)[8.00 x 10⁻³]²

Rate = (6.75 x 10⁻⁶)[6.4 x 10⁻⁵]

Rate = 4.32 x 10⁻¹⁰  -------> 43.2 x 10⁻¹¹

Al(oh)3 has a Ksp of 1.26 x \(10^{-33}\). Its molar solubility is 2.6 x \(10^{-9}\) M . So the correct option is (c).

With this knowledge, you may calculate the molar solubility, or the number of moles that can dissolve per liter of solution before the solution becomes saturated. Ksp is a function of temperature. The units are expressed in moles per liter, also abbreviated as mol/L or M.

The solubility and the solubility product constants are related in that one can be used to calculate the other. In other words, since Ksp is actually the product of the solubility of each ion in moles per liter, there is a link between the solute's molarity and the solubility of the ions.

Therefore, Al(oh)3 has a ksp of 1.26 x \(10^{-33}\). Its molar solubility is 2.6 x \(10^{-9}\) M . So the correct option is (c).

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The glassware and equipment needed for this procedure include a burette to dispense the NaOH solution, a pipette to measure the beverage, a conical flask to hold the beverage, and an indicator to detect the endpoint of the titration

Titrating a beverage to determine the concentration of a weak acid requires several steps and specific materials. Here is a step-by-step procedure:

1. First, prepare the standard solution of a strong base, such as NaOH, by accurately weighing the desired amount and dissolving it in distilled water.

2. Use a pipette to measure a precise volume of the beverage into a clean conical flask.

3. Add 2-3 drops of a suitable indicator to the beverage, such as phenolphthalein, which changes color when the pH reaches 8.2-10.

4. Slowly add the standardized NaOH solution to the beverage with continuous swirling until the indicator changes color.

5. Record the volume of the NaOH solution added, which will be equal to the volume of weak acid in the beverage.

6. Repeat the titration 2-3 times to obtain accurate results.

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Answer:

I can't do that but this is the best I can do for you :(

Explanation:

Nitric acid, HNO3(aq), breaks up into ions (a cation and an anion) in a water solution.

ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

The element X is titanium.

According to the question, the percentage by mass of Cl in XCl4  is 75.0%.

The percentage by mass is obtained from;

Mass of element in the compound/molar mass of compound * 100

Hence;

Let the mass of the unknown element be X

75 = 142/X + 142 * 100

75 (X + 142) = 142 * 100

75X + 10650 = 14200

75X =  14200 - 10650

X = 14200 - 10650/75

X = 47

Hence, X is titanium.

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Inertia and gravity combine to keep the Earth in its orbit around the Sun. Inertia is the tendency of an object to remain in motion or at rest unless acted upon by an external force.

Gravity is the force of attraction between two objects that have mass. The Sun's gravitational pull on the Earth creates a centripetal force that pulls the Earth towards the Sun. At the same time, the Earth's inertia is trying to keep it moving in a straight line. These two forces balance each other out, and as a result, the Earth orbits the Sun in an elliptical path. The amount of gravitational force between two objects depends on their masses and the distance between them. The larger the mass of the objects and the closer they are, the stronger the gravitational force. In the case of the Earth, the force of gravity exerted by the Sun is strong enough to overcome the Earth's inertia and keep it in its orbit.

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When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

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Answer:

The correct answer is a. C5H5N5

Explanation:

The empirical formula of a compound is the simplest whole number ratio of the atoms of each element in the compound. In this case, the empirical formula of the compound C5H5N5 is C5H5N5, which is the simplest whole number ratio of the atoms of carbon, hydrogen, and nitrogen in the compound.

Answer:

It is ultracool dwarfs make up about 15% of the astronomical objects.................blah blah blah

Explanation:

took test

The simplest way of separating visible solid impurities that do not dissolve in water from water is by using a sieve (option A).

Sieving is a act of passing substances through a sieve, which is a device with a mesh bottom to separate, in a granular material, larger particles from smaller ones, or to separate solid objects from a liquid.

Sieving is a physical method of separation widely used to separate substances that cannot dissolve in a liquid from that liquid.

Therefore, the simplest way of separating visible solid impurities that do not dissolve in water from water is by using a sieve.

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Answer:

2 mole of Sodium hydroxide reacts with 1 mole of Sulfuric acid

Explanation:

Write down the equation in the beginning with reactants and products:

NaOH + H₂SO₄ → Na₂SO₄ + H₂0

Now try to balance it. Try with Na first:

2NaOH + H₂SO₄ → Na₂SO₄ + H₂0

Na atoms are balanced. There are 6 Oxygen atoms on the right and 5 on the left. Balance by increasing the H₂O moles:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0

Check if H atoms are also balanced. They are. That means our final reaction is:

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0

2 Moles of NaOH reacts with 1 mole of H₂SO₄

The moles of sodium hydroxide required to neutralize 1 mole of sulfuric acid have been 2 mol.

The balanced chemical equation for the titration of sodium hydroxide against sulfuric acid has been:

\(\rm 2\;NaOH\;+\;H_2SO_4\;\rightarrow\;Na_2SO_4\;+\;2\;H_2O\)

From the balanced chemical equation, for the titration of 1 mole of sulfuric acid, 2 moles of sodium hydroxide has been required.

The moles of sodium hydroxide required for the titration of sulfuric acid has been:

\(\rm 1\;mol\;H_2SO_4=2\;mol\;NaOH\)

Thus, the neutralization of 1 mole of sulfuric acid has been required 2 mol of sodium hydroxide.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Answer: 4.8 grams of hydrogen is 2.4 moles, and 38.4 grams of oxygen is 1.2 moles. This is exactly the Stoichiometry ratio of the reaction, therefore the two will both completely react giving rise to the same total mass of water.

The correct answer is D. 0.089.

Vapor density is the ratio of the density of a gas to the density of hydrogen gas at the same conditions of temperature and pressure. Since hydrogen gas has a density of 0.089 g/L at NTP (Normal Temperature and Pressure), the vapor density of a gas with a density of 0.178 g/L at NTP would be:

Vapor density = (Density of gas) / (Density of hydrogen gas at NTP)
Vapor density = 0.178 g/L / 0.089 g/L
Vapor density = 2

Therefore, the vapor density of the gas is 2, which corresponds to option B.

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