In table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether you can. If there is not enough information to decide, choose can't decide in the third column. element metal or nonmetal? description Element 1 is a moderately soft yellow solid. A 5 cm x 5 cm square of it, only 1 mm thick, is heated with a flame at one end. Where the flame touches the square the sample rapidly turns red and starts to melt, but the rest of the square remains cool to the touch. metal nonmetal (can't decide) metal o mecan (can't decide) Element 2 is a faintly yellow gas. 100 cm of the gas are compressed to al new volume of 10 cm. When the compressed aas is allowed to leak out through a small hole, it becomes warmer. Element 3 is a hard silvery-gray solid. A 10. g cube of it is set on a hot 50 °C. plate. After 1 minute, the temperature of the top of the cube has risen by metal nonmetal (can't decide)

Answer: Matter is made of atoms. Solids, liquids, gases, and plasma are all matter. When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom.

Explanation:

CH3 is the empirical formula for the compound.

A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.

The number of atom or moles in the compound is

1.17 g C X  1 mol of C / 12.011 g C = 0.097411 mol of C.

0.287 g H x 1 mol of  H / 1 g H = 0.28474 mol H.

This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.

So we can represent the compound with the formula C0.974H0.284.

Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.

we can divide 0.284 by 0.0974.

0.284 / 0.0974 = 3.

So here, Carbon is one and hydrogen is 3.

We can write the above formula as a CH3.

Hence the empirical formula for the sample compound is CH3.

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Answer:

97.561 g/mol

Explanation:

Answer:

One atom must be much more electronegative than the other.

Answer: The answer is D :)

Explanation:

Answer:

D

Explanation:

A color change does not indicate a chemical change is occurring. The correct answer is option (D) color changed

Chemical change refers to a transformation in which one or more molecules break into new ones, and this transformation includes a change in chemical composition and is accompanied by a release or absorption of energy. Bonds break, and atoms are rearranged during a chemical change, resulting in new molecules. Chemical change indicators,

The following are some of the indicators of a chemical change: Formation of precipitate a chemical reaction produces a new substance that is distinct from the original. In chemical reactions that occur in solution, a precipitate can form when two aqueous solutions are combined. Evolution of gas/bubbles, A chemical reaction can create a gas that causes the mixture to effervesce. Bubbles of gas are an indication that a reaction is occurring. Color changed a chemical reaction may cause the color of the reactants to change, or it may result in the formation of a product that is colored. Phases of matter change a chemical reaction can cause a change in state or phase. A liquid can be transformed into a solid, or a gas can be transformed into a liquid. However, color change does not indicate a chemical change is occurring.

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When cooking an egg and waiting for coagulation, two things to look for are the firmness of the egg white and the doneness of the yolk.

The egg white should become opaque and set, indicating that it has coagulated properly. The yolk can be cooked to different degrees of doneness, depending on personal preference. For a runny yolk, it should still be soft and slightly jiggly in the center. For a firmer yolk, it should be more set and less jiggly. By observing these two aspects, you can determine the coagulation stage of the egg and achieve the desired texture for your egg dish.

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True. Theoretically, the melting point and the freezing point of a substance occur at different temperatures. Therefore, it is true that the melting point and the freezing point of a substance occur at different temperatures.

Melting point is defined as the temperature at which a solid changes into a liquid at a given atmospheric pressure, whereas the freezing point is the temperature at which a liquid turns into a solid. Despite having the same temperatures, they are referred to as different events in terms of thermodynamics. Although they are not always similar in temperature, it is usually close. The temperature of the melting point and freezing point of a substance is identical for pure materials, but the temperature of the melting point and freezing point of a substance is different for materials that are not pure. The difference between the melting point and freezing point is also known as the melting range.
In a nutshell, melting and freezing points of a substance refer to the temperatures at which a solid turns into a liquid and a liquid turns into a solid, respectively. These temperatures may differ or be the same for pure and impure substances. However, theoretically, they are not the same for pure substances. Hence, the statement "Theoretically, the melting point and the freezing point of a substance occur at different temperatures" is true.

Conclusion:
Therefore, it is safe to say that theoretically, the melting point and the freezing point of a substance occur at different temperatures. The temperature difference between the melting point and freezing point is known as the melting range.

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Answer:

a.One or more electrons will move to a higher energy orbit

Explanation:

Absorbing energy means that the electron gets excited and jumps to a higher level.

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

where

m is the mass

v is the velocity

From the question

m = 1.6 kg

v = 25 m/s

We have

\(k = \frac{1}{2} \times 1.6 \times {25}^{2} \\ = 0.8 \times 625 \\ = 500\)

We have the final answer as

Hope this helps you

The product(s) of a chemical reaction are determined by the reactants and their specific properties. Without knowing the reactants or their structures, it is impossible to determine the products with certainty. Therefore, I cannot provide a direct answer to the question posed without additional information.

However, I can provide some general guidelines for predicting products of chemical reactions. Chemical reactions can lead to the formation of different products, depending on the reactants involved, their reactivity, and the reaction conditions. The nature of the reaction, such as whether it is an acid-base reaction or a redox reaction, can also influence the products formed. Furthermore, the reaction may result in a mixture of products, depending on the reaction conditions and the extent of the reaction.

Therefore, to determine the products of the specific reaction provided in the question, additional information is required regarding the reactants and the reaction conditions. Without this information, it is not possible to determine the products of the reaction with certainty.

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Answer:

Explanation:

35.453 u

2.56 moles of HCl are required to react with 0.64 moles of KMnO4.

The balanced chemical equation is given as;2KMnO4 + 8HCl → 3Cl2 + 2MnO2 + 4H2O + 2KCl.This equation is balanced in such a way that 2 moles of KMnO4 reacts with 8 moles of HCl to produce 3 moles of Cl2, 2 moles of MnO2, 4 moles of H2O and 2 moles of KCl.We are given the number of moles of KMnO4 as 0.64 moles.Now, we can use stoichiometry to find the number of moles of HCl required to react with 0.64 moles of KMnO4.The balanced chemical equation shows that 8 moles of HCl reacts with 2 moles of KMnO4.

So, one mole of KMnO4 would react with 8/2 = 4 moles of HCl.Now, the number of moles of HCl required to react with 0.64 moles of KMnO4 would be;Moles of HCl = Moles of KMnO4 x (Moles of HCl / Moles of KMnO4) Moles of HCl = 0.64 x 4 = 2.56 moles of HCl.

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Answer:

1) two

2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs

3) O=C=O

4) No, there is not because carbon needs four bonds, so it bonds with each-

5) H-O-O-H

Explanation:

Answer: 1) two

2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs

3) O=C=O

4) No, there is not because carbon needs four bonds, so it bonds with each-

5) H-O-O-H

2-Methyl-2-butanol is a type of alcohol that is also known as tert-butyl alcohol or 2-methylpropyl alcohol.

what are the properties of 2-Methyl-2-butanol ?

It is a clear, colorless liquid that has a characteristic sweet and fruity odor. This alcohol is used in a variety of applications, including as a solvent, as a fuel additive, and as an intermediate in the synthesis of other chemicals. It is also used in the production of various fragrances and flavors, as well as in the formulation of certain pharmaceuticals and personal care products.

2-Methyl-2-butanol (tert-butyl alcohol) is a branched-chain alcohol that is characterized by its four carbon atoms and its secondary alcohol functional group. It is a clear, colorless, and relatively low-volatility liquid that has a low water solubility and a relatively low boiling point compared to other alcohols of similar molecular weight.

In terms of its properties and uses, 2-methyl-2-butanol is an effective solvent for a variety of organic compounds, including resins, fats, and oils, and it is also used as a starting material for the production of other chemicals. As a fuel additive, it can help to increase the octane rating of gasoline, and it can also help to reduce engine knock and improve fuel efficiency.

2-Methyl-2-butanol is a type of alcohol that is also known as tert-butyl alcohol or 2-methylpropyl alcohol.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 25 \times {2.5}^{2} \\ = 12.5 \times 6.25 \\ = 78.125 \: \: \: \: \: \: \: \: \)

We have the final answer as

Hope this helps you

Answer:

The size of the atom closest to 30 to 300 pm

Explanation:

On examining the following order we can say that ethers and esters got switced.

Alkyl halides, saturated hydrocarbons, unsaturated hydrocarbons, ethers, esters, ketones, amines, alcohols, phenols, and acids are typically eluted from columns in the following order. Salts and polymeric substances frequently do not elute. From fastest to slowest elution, the following substances are roughly in order based on polarity: hydrocarbons, olefins, ethers, halocarbons, aromatics, ketones, aldehydes, esters, alcohols, amines, and acids.

Be aware that regardless of the polarity of the compounds, the more polar the solvent, the quicker the chemicals elute. This means that the order in which chemicals elute from a TLC or column cannot be altered by altering the solvent's polarity. So, on examining the following order we can say that ethers and esters got switced.

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Answer:

To adjust the substance condition, you need to ensure the quantity of molecules of every component on the reactant side is equivalent to the quantity of particles of every component on the item side. To make the two sides equivalent, you should duplicate the quantity of particles in every component until the two sides are equivalent.

Explanation:

For the ionization constant for acetic acid is 1.8 x 10-5; that for hydrocyanic acid is 4 x 10-10, The solution is basic due to the generation of OH– ions.

ionization constant is simply defined as a constant that relies on the equilibrium that exists b/w ions and molecules of solution.

Generally, the equation for the Chemical reaction  is mathematically given as

CH3C.O .O + H2_O ----> CH3COOH + O.H

Therefore

the anion C...N–  receives H+ ion from water as it goes through hydrolysis.

Hence

xN– + H2..O ----><---- HxN + O..H–

In conclusion, The solution is basic due to the generation of OH– ions.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{1.00 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 16.6112956...\)

We have the final answer as

Hope this helps you

The graph shows the continuous growth of bacteria at constant rate.

Bacteria is defined as a creatures without a proper nucleus and only a few organelles that are prokaryotic unicellular organisms. The bacteria in our systems aid in the breakdown of the food we consume, assist in making nutrients available to us, and remove poisons.

The type of growth is a good model of epidemic because the growth of bacteria is continuous which increase the growth of epidemic as well.  The type of growth is a bad model because growth of causes harmful effect to the body.

Thus, the graph shows the continuous growth of bacteria at constant rate.

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Answer:

Explanation:

#cArryonLeArning

A concentration gradient exists in a solution when there is more concentration of the solute in a part of the solution than another.

The amount of solutes contained in a solution is called its concentration. If a drop of food colouring is added to a glass of water without stirring it, only part of the water closest to where the food colouring was added gets coloured at first, while the rest of the water remains colourless. Hence, in this state, a concentration gradient is said to exist. The concentration gradient gradually disappears as the food colouring diffuses through the liquid.

Membranes can be used to maintain a concentration gradient as solutes always try to move down the concentration gradient. Diffusion eliminates concentration gradients.

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There are approximately 1.93 × \(10^{23\) molecules of sodium carbonate in a 34.1 g sample.

The molar mass of sodium carbonate (\(Na_2CO_3\)) is 105.99 g/mol.

To calculate the number of molecules present in a 34.1 g sample, we can use the following formula:

Number of moles of the compound (n) = Mass of the compound (m) / Molar mass of the compound (M)

We can use this formula to calculate the number of moles of sodium carbonate in the given sample:

n = m / M = 34.1 g / 105.99 g/mol = 0.321 moles

Now, we need to calculate the number of molecules of sodium carbonate that are present in this sample.

We can use Avogadro's number (6.022 × \(10^{23\)) to convert from moles to molecules:

Number of molecules = Number of moles × Avogadro's number

= 0.321 moles × 6.022 × \(10^{23\) molecules/mol

= 1.93 × \(10^{23\) molecules

Therefore, there are approximately 1.93 × \(10^{23\) molecules of sodium carbonate in a 34.1 g sample.

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The change in free energy (ΔG) for the reaction N₂ + 3H₂ ⟶ 2NH₃, using the given standard free energies of formation, is -32.6 kJ/mol.

To calculate the change in free energy (ΔG) for the given reaction, we can use the formula:

ΔG = \(\sum (n \Delta G^\circ_f(\text{products})) - \sum (m \Delta G^\circ_f(\text{reactants}))\)

Where:

ΔG∘f = standard free energy of formation

n = stoichiometric coefficient of the product

m = stoichiometric coefficient of the reactant

In this case, the balanced equation is:

N₂ + 3H₂ ⟶ 2NH₃

Using the given standard free energies of formation, we can calculate the change in free energy:

ΔG = \((2 \cdot \Delta G^\circ_\text{f}(NH_3)) - (1 \cdot \Delta G^\circ_\text{f}(N_2) + 3 \cdot \Delta G^\circ_\text{f}(H_2))\)

Plugging in the values:

ΔG = \((2 \cdot (-16.3 \, \text{kJ/mol})) - (1 \cdot 0 \, \text{kJ/mol} + 3 \cdot 0 \, \text{kJ/mol})\)

ΔG = (-32.6 kJ/mol)

Therefore, the change in free energy for the reaction is -32.6 kJ/mol.

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Answer:B

Explanation:

Hydrazine is a chemical compound with the formula \(N_2H_4\). 120 molecules of\(NH_3\) will be formed if 60 molecules of \(N_2H_4\) decompose into \(N_2\) and \(NH_3\).

It is used as a rocket fuel and as a polymerization catalyst in the production of plastics and when hydrazine decomposes, it produces nitrogen gas (\(N_2\)) and ammonia (\(NH_3\)). If 60 molecules of hydrazine decompose into \(N_2\) and \(NH_3\), the number of molecules of \(NH_3\) that will be formed can be determined using the balanced equation for the reaction: \(N_2H_4 -- > N_2 + 2NH_3\). For every one molecule of hydrazine that decomposes, two molecules of ammonia are formed. Therefore, the number of ammonia molecules produced is twice the number of hydrazine molecules that decompose. Since 60 molecules of hydrazine are decomposing, the number of ammonia molecules formed is: 2 x 60 = 120 molecules of \(NH_3\)

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Solids, liquids, and gases differ in terms of packaging of the atoms in its constituent atomic level.

Solids, liquids, and gases are the three main states of matter. They differ in the way their atoms or molecules are arranged and how they interact with one another. Solids have a definite shape and a definite volume. The atoms or molecules in a solid are tightly packed together and are not free to move around. Solids also have a low compressibility and a high density. Liquids have a definite volume but no definite shape. They take the shape of their container. The atoms or molecules in a liquid are close together but are free to move around. Liquids have a low compressibility and a lower density than solids. Gases have no definite shape or volume. They expand to fill their container. The atoms or molecules in a gas are widely spaced and are free to move around. Gases have a high compressibility and a low density. Examples of gases include air, oxygen, and natural gas. In summary, Solids have a fixed shape and volume, liquids take the shape of their container, have a definite volume and gases have no fixed shape or volume and expand to fill their container.

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