RES
Which of these data come from reliable sources? Check all that apply
the scientific name of an organism listed in an encyclopedia
O a list of medical statistics written in a magazine advertisement
solar activity data reported by NASA on its website
the behavior of a species described in a science fiction novel
the behavior of a species described in a professional journal

Answer:

number C

Explanation:

Answer:

See explanation

Explanation:

Barium sulphate is easily prepared by means of a double replacement reaction. A double replacement reaction is one in which the ions in each of the reactants exchange partners in the products.

For instance, we can decide to prepare barium sulphate by a double replacement reaction between sodium sulphate and barium chloride. The both starting materials are soluble compounds. However, the barium sulphate formed is an insoluble white precipitate. The precipitate is recovered by filtration, washed and dried.

The reaction equation is shown below;

Na2SO4(aq) + BaCl2(aq)  -------> BaSO4(s) + 2NaCl(aq)

Answer:

The identity of an element is its atomic number, which is the number of protons within the nucleus of one of its atoms.

Explanation:

a) The oxidizing agent is CrO42-, which is reduced to Cr(OH)3. The reducing agent is Cr(s), which is oxidized to Cr(OH)3.

a. Cr(s) + CrO42-(aq) → Cr(OH)3(s) in basic aqueous solution

To balance the equation, we need to follow these steps:

1. Balance the atoms other than hydrogen and oxygen:

2Cr + CrO42- → Cr(OH)3

2. Balance the oxygen atoms by adding water molecules (H2O):

2Cr + CrO42- + 7H2O → Cr(OH)3

3. Balance the hydrogen atoms by adding hydroxide ions (OH-):

2Cr + CrO42- + 7H2O + 14OH- → 2Cr(OH)3 + 8H2O

The balanced equation is:

2Cr(s) + CrO42-(aq) + 7H2O + 14OH-(aq) → 2Cr(OH)3(s) + 8H2O

The oxidizing agent is CrO42-, which is reduced to Cr(OH)3.

The reducing agent is Cr(s), which is oxidized to Cr(OH)3.

b. MnO4-(aq) + S2-(aq) → MnS(s) + S(s) in acidic aqueous solution

The balanced equation is:

2MnO4-(aq) + 5S2-(aq) + 16H+(aq) → 2MnS(s) + 8H2O + 5S(s)

The oxidizing agent is MnO4-, which is reduced to MnS.

The reducing agent is S2-, which is oxidized to S.

c. CN-(aq) + MnO4-(aq) → CNO-(aq) + MnO2(s) in basic aqueous solution

The balanced equation is: 3CN-(aq) + 4MnO4-(aq) + 4OH-(aq) → 3CNO-(aq) + 4MnO2(s) + 2H2O

The oxidizing agent is MnO4-, which is reduced to MnO2.

The reducing agent is CN-, which is oxidized to CNO.

d. Cl2(g) → Cl-(aq) + OCl-(aq) in acidic aqueous solution

The balanced equation is:

Cl2(g) + 2H2O(l) → 2Cl-(aq) + OCl-(aq) + 2H+(aq)

The oxidizing agent is Cl2, which is reduced to Cl- and OCl-.

The reducing agent is H2O, which is oxidized to OCl-.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Given that the valence electrons were removed or added to the following elements to fulfill the octet, barium's charge would be +2

The octet rule generally refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have lesser than eight electrons, they tend to react and form more stable compounds.

This certainly means that the atom's valence shell has a resemblance with a noble gas. The octet rule states that the atoms like to have eight electrons only in their full outer shells.

In case of barium the valence electronic configuration is [Xe] \(6s^{2}\). So here we can see that in order to reach the nobel gas configuration Barium needs to loose only 2 electrons and after that barium will attain Xenon configuration. Hence the charge on Barium would be 2+.

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Answer: diamond

Explanation:

Diamond is a giant covalent molecule, containing millions of carbon atoms. Because of this, diamond is classified as a macromolecule.

Oxidation and reduction are always coupled and cannot occur independently of each other.

Oxidation and reduction accompany all chemical reactions: This statement is not true. While oxidation and reduction are common in many chemical reactions, not all reactions involve these processes. Some chemical reactions do not involve any change in the oxidation state of the elements involved, and therefore, oxidation and reduction do not accompany those reactions. However, when oxidation or reduction does occur, it is often an important aspect of the reaction and can play a significant role in the overall process. These processes are interconnected because the electrons lost in the oxidation reaction must be gained by the substance undergoing reduction.

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"Salt lowers water's freezing point" is correct. Utah's Great Salt Lake never freezes because of its high salt content. Salt dissolves in water, reducing its freezing point. The correct answer is option c.

Salt ions prevent water from freezing. Salt's freezing point depression keeps Great Salt Lake water liquid at cold conditions.

The Great Salt Lake in Utah doesn't freeze in winter because salt lowers the freezing point. The freezing point of pure water is 0 degrees Celsius (32 degrees Fahrenheit), however when salt is dissolved in water, it disturbs ice crystal formation and prevents freezing. Sodium ions (Na+) and chloride ions (Cl-) make up salt. When salt dissolves in water, these ions separate and surround water molecules. This is hydration.

Water molecules' hydrogen bonding is affected by salt. Hydrogen bonding links water molecules to produce ice crystals. The hydrogen bonding network is disrupted by salt, making it harder to create ice crystals. Because of this, the Great Salt Lake stays liquid even in cold winters. The Great Salt Lake's salt lowers the freezing point through influencing hydrogen bonding between water molecules.

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Answer:

Is an absolute temperature scale with zero at absolute zero

Answer: The energy of the particles of matter determines the matters state

Explanation: hope this one helps rather than the first one!!

Answer:

This is and ADDITION REACTION

Explanation:

Because your putting a compound and an element together

Answer:

This is an addition reaction.

The products are more stable than the reactants.

Explanation:

Answer:

See the answer below

Explanation:

In chemistry, indicators are substances that are capable of changing colors with respect to the pH. Each indicator has its characteristic color in acidic pH and another characteristic color in alkaline pH.

Methyl orange indicator appears red in acidic solution and yellow in basic solutions. Phenolphthalein is usually colorless in acidic solutions and appears pink in basic solutions. A red litmus paper will turn blue in alkaline solutions while a blue litmus paper will turn red in acidic solutions.

Answer:

3.98dm³

Explanation:

Using combined gas law equation:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (dm³)

V2 = final volume (dm³)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the provided information in this question:

V1 = 3.5dm³

V2 = ?

P1 = 101 kPa

P2 = 85.0 kPa

T1 = 23.0°C = 23 + 273 = 296K

T2 = 10.0°C = 10 + 273 = 283K

Using P1V1/T1 = P2V2/T2

101 × 3.5/296 = 85 × V2/283

353.5/296 = 85V2/283

Cross multiply

296 × 85V2 = 353.5 × 283

25,160V2 = 100,040.5

V2 = 100,040.5 ÷ 25,160

V2 = 3.98dm³

Answer:

D Trigonal pyramidal

Explanation went over in class:

Answer:

D. Trigonal pyramidal

Explanation:

A P E X !

The correct answers  for the ionic compound represented by the model of its cubic unit cell. The anions are larger than the cations in this example are:

B. The empirical formula for this ionic compound would have a 1:1 cation-to-anion ratio.

C. There are three anions per unit cell represented in this model.

D. There are four cations per unit cell represented in this model.

A. The model is an example of an orthorhombic cubic cell - This statement is not correct. An orthorhombic crystal system does not have a cubic unit cell.

B. The empirical formula for this ionic compound would have a 1:1 cation-to-anion ratio - This statement is correct. The presence of one cation and one anion per unit cell implies a 1:1 cation-to-anion ratio in the empirical formula.

C. There are three anions per unit cell represented in this model - This statement is correct. The model shows three anions present in the unit cell.

D. There are four cations per unit cell represented in this model - This statement is correct. The model shows four cations present in the unit cell.

E. The empirical formula for this ionic compound would have a 4:3 cation to anion ratio - This statement is not correct. The empirical formula would have a 1:1 cation-to-anion ratio based on the information given.

F. The model is an example of a face-centered cubic cell - This statement is not correct. The given information does not specify the crystal structure type, so we cannot determine if it is a face-centered cubic cell.

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Answer: How long can a thawed turkey remain in the refrigerator after thawing? It takes approximately 24 hours for every 4 to 5 pounds of whole turkey to thaw in the refrigerator. Once the turkey is thawed, you can keep it in the refrigerator for 1 to 2 additional days before cooking. For more information about thawing a turkey, go to Turkey Basics: Safe Thawing.

Explanation: so in other words, yea up to a point

                                                                               ··                               ··  

The balanced equation was found to be Na· + ·Cl : ---------> Na + (: cl : )-

                                                                               ..                               ..          

Define ionic bond dot diagram ?

Group 8 elements, generally known as noble gases, are noted for their inertness. They hardly never react with other elements, such as water, oxygen, or metals. This is due to the fact that they all have a complete outer shell of electrons. This is the most stable electron configuration possible for an atom.

Other elements, on the other hand, do not have this stable electron configuration. Instead, in order to obtain that ideal arrangement, they must acquire, lose, or share electrons. Ionic bonding is one method for doing this.

the answer for the ionic bond dot diagram for the Nacl was found to be.

           ··                              ··

Na· + ·Cl : ---------> Na + (: cl : )-

           ..                              ..

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The molarity (M) of a solution is 11.5 M that contains 0.75 moles of lithium fluoride, LiF in a 65 ml of solution.

Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I Unit of Molarity is molar (M) or mol/L.

Molarity (M) = \(\frac{\text{Number of moles of solute}}{\text{Volume of solution (in liters)}}\)

From the above definition it is clear that the volume of solution is in liter. In question the volume of solution is given in ml.

So, convert 65 ml into l.

65 ml = \(\frac{65}{1000}\) = 0.065 l

Now, put the values in above formula, we get that

(M) = \(\frac{0.75}{0.065}\) = 11.5 M

Thus, the molarity of a solution is 11.5 M that contains 0.75 moles of lithium fluoride, LiF in a 65 ml of solution.

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An indicator is added during an acid-base titration to visually indicate the endpoint of the titration. The endpoint is the point at which the acid and base have completely reacted with each other in stoichiometric amounts, resulting in a neutral solution.

During the titration, the acid and base are gradually added to each other until the endpoint is reached. At this point, the indicator changes color, indicating that the neutralization reaction is complete and the titration can be stopped.

The purpose of adding an indicator is to make it easier to determine the endpoint of the titration. Without an indicator, it can be difficult to determine when the neutralization reaction is complete. The indicator changes color at or very near the endpoint, providing a clear visual signal that the reaction is complete.

Different indicators are used depending on the type of acid-base titration being performed. For example, phenolphthalein is commonly used as an indicator in acid-base titrations because it changes color in the pH range of 8.2 to 10, which is near the endpoint of many acid-base titrations.

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The concentration of A after 495 s is 0.00216 M.

The rate law for the reaction can be expressed as:

Rate = k[A]

Where k is the rate constant and [A] is the concentration of reactant A.

Given k = 0.600 M^-1.s^-1 at 200°C, we can use the integrated rate law for a first-order reaction to determine the concentration of A at a given time:

ln([A]t/[A]0) = -kt

Where [A]t is the concentration of A at time t, [A]0 is the initial concentration of A, and t is time.

Substituting the given values, we get:

ln([A]t/0.00320) = -(0.600 M^-1.s^-1)(495 s)

Solving for [A]t, we get:

[A]t = 0.00320 × e^(-0.297)

[A]t = 0.00216 M

Therefore, the concentration of A after 495 s is 0.00216 M.

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Atoms of hydrogen are then balanced. Watch the following video to learn more about oxygen atoms. C12H22O11 with 12O2 equals 12CO2 plus 11H2O.

Balance C12H22O11 + O2 CO2 + H2O

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Yes, a reaction will occur when aqueous solutions of potassium chloride and silver(I) acetate are combined. The reaction is as follows:

2KCl + AgC2H3O2 → K2C2H3O2 + AgCl

This reaction occurs because when aqueous potassium chloride and silver(I) acetate are combined, the positively-charged ions in the two compounds interact. The positively-charged potassium ions are attracted to the negatively-charged acetate ions, and the positively-charged silver ions are attracted to the negatively-charged chloride ions. This interaction causes the two compounds to form a neutral salt, potassium acetate, and silver chloride, both of which are insoluble in water.

Are solutions in which the solvent is water. They are formed when a solute, such as a salt, sugar, or acid, is dissolved in water. Aqueous solutions are a common form of solution used in chemistry and are found in many everyday products, such as:

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The structures of ionic and covalent compounds differ in terms of the bonding between atoms. Ionic compounds have a crystal lattice structure formed by the attraction of oppositely charged ions, while covalent compounds involve the sharing of electrons between atoms to form molecules or complex structures.

The oppositely charged ions in ionic compounds attract each other, forming a crystal lattice structure. The bonding in ionic compounds is non-directional, meaning that ions are arranged in a repeating pattern without specific bond angles.

Covalent compounds can form simple molecules, such as H2O or CO2, or complex structures like polymers. The bonding in covalent compounds is directional, meaning that the atoms are connected by specific bond angles.

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The statement " Oxygen is oxidized and hydrogen is reduced" identifies the element(s) as being oxidized and reduced in the reaction.

Oxidation represents a chemical transformation entailing the relinquishment of electrons. Within an oxidation reaction, a certain entity forfeits electrons to another entity. The entity undergoing electron deprivation is referred to as oxidized, while the entity acquiring electrons is labeled as reduced.

Oxidation possesses the potential to be advantageous, serving purposes such as energy generation or the decomposition of detrimental substances. Nevertheless, oxidation may also manifest as a deleterious phenomenon, provoking the corrosion of metals or the decay of edibles.

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Answer: when gas is heated ,they gain more kinetic energy causing them to move faster.

Explanation: so as they gain kinetic energy they hit the walls of the container with more force thus causing pressure to increase

HOPE THIS HELPSS comment if u need more explanation

Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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Answer:

Sorry pal! Didn't understand your language.  

:(

Explanation: