A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components. A solution is a mixture that looks exactly the same everywhere. Which of these mixtures is a solution
A) a fruit salad
B) a chocolate chip cookie
C) a mixture of sugar and salt
D) a mixture of sugar and water

For getting an indication whether a chemical reaction or chemical change has taken place, if  B)Heat is given off then chemical reactions occur. So,correct option is B.

Chemical reactions are surrounding us, from the digestion of food in our body to how the light we get from the sun is the consequence of compound responses. Prior to starting with compound responses, realizing about physical and synthetic changes is significant

Option A can't be the response is dissolving is an actual change. No substance response occurred.

Option B is the response as it is an EXOTHERMIC reaction so intensity will be emitted.

Option C can't be the response as dissolving is essentially ions becoming particles, not a synthetic response by which a reactant responds with one more reactant to shape an item.

Option D can't be the response. Same explanation with respect to why An isn't the response.

Hence, correct option is B.

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(Complete question) is:

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.

If the amount of \(CO_{2}\) in solution decreases, the concentration of \(H_{2}CO_{3}\) in the solution would also decrease.

Dissolved \(CO_{2}\) concentration drops as solution \(CO_{2}\) decreases. \(CO_{2}\) combines with water to generate carbonic acid (\(H_{2}CO_{3}\)), therefore less \(CO_{2}\) means less carbonic acid in the solution.

The equilibrium reaction between dissolved \(CO_{2}\) and carbonic acid is:

\(CO_{2}\) (g) + \(H_{2}O\) (l) = \(H_{2}CO_{3}\) (aq)

Le Chatelier's principle states that an equilibrium system will change to mitigate stress. A reduction in \(CO_{2}\) in solution stresses equilibrium. To reduce stress, the equilibrium will shift left, lowering carbonic acid (\(H_{2}CO_{3}\)) concentration.

Thus, \(H_{2}CO_{3}\) concentration decreases with \(CO_{2}\) concentration.

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Answer:

give it your all but know your limits

Explanation:

Answer:

"Anion" is correct option

Explanation:

An anion is an ion that has gained one or more electrons, acquiring a negative charge.

Another isotope of an atom having atomic number 56 and mass number 138 will have different number of neutrons.

An atom with an atomic number of 56 and a mass number of 138 is barium-138. The number of protons in the nucleus of an atom is equal to its atomic number, so barium-138 has 56 protons. The mass number of an atom is the sum of the number of protons and neutrons in the nucleus, so barium-138 has 138 - 56 = 82 neutrons.

The other isotopes of barium have the same number of protons (56) but different numbers of neutrons. Some possible isotopes of barium include:

Barium-137: This isotope has 81 neutrons.

Barium-135: This isotope has 80 neutrons.

Barium-133: This isotope has 79 neutrons.

These are just a few of the many possible isotopes of barium. The number of neutrons in an isotope can vary, but the number of protons will always be the same.

Thus, the correct answer is different number of neutrons.

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Answer:

Explanation: Diamond and graphite are made out of carbon atoms. The difference between the two substance is the arrangement of the carbon atoms inside each one.

Answer:

Diamond and graphite are allotropes of carbon

Explanation:

» Diamond has tetrahedral edges associating through weaker vander waal forces of attraction, it is colorless and glittering, and it is very hard.

» Graphite has hexagonal edges associating vander waal forces, it is black in color and it is soft. Example of graphite is the black rod in a dry cell.

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An ion of Na+ (sodium) with a charge of +1 would most likely ionically bond with an atom of Cl- (chlorine) in a 1:1 ratio.  option(c)

Ionic bonding occurs between a metal and a nonmetal, where the metal loses electrons to form a positively charged ion (cation), and the nonmetal gains those electrons to form a negatively charged ion (anion).

Sodium, a metal, readily loses one electron to achieve a stable electron configuration similar to that of the noble gas neon. This results in the formation of Na+ ion with a +1 charge. Chlorine, a nonmetal, has seven valence electrons and requires one additional electron to attain the electron configuration of the noble gas argon. Therefore, chlorine readily accepts one electron, forming a Cl- ion with a -1 charge.

The 1:1 ratio of sodium to chlorine ions allows for the transfer of one electron from sodium to chlorine, resulting in the formation of the ionic compound sodium chloride (NaCl), commonly known as table salt. The electrostatic attraction between the oppositely charged ions holds the compound together in a crystal lattice structure. option(c)

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Answer:

The dam disrupts the river wildlife and ecosystem.

Explanation:

Though it is believed that using the dam as a power generation or hydroelectric power supply generates no greenhouse gases, it, however, has many disadvantages which make it deemed not suitable or sustainable for use in the contemporary time.

Majorly, the top reason why more hydroelectric dams are not built is that "the dam disrupts the river wildlife and ecosystem."

Also, it affects the water quality and other use of water for humans such as recreational use.

There is also a possible chance of dams producing methane; a greenhouse gas through the organic materials in the water that is rotting.

There are two terms that are related to measurements, one is accuracy and other is precision. Therefore, Group A makes the most accurate measurements of the object. The correct option is option D.

The capacity of an instrument to measure an exact number is known as accuracy. In other words, it refers to how closely the measured value resembles a reference or genuine value.

Small readings can be taken to determine accuracy. The modest reading decreases the calculation's inaccuracy. Group A makes the most accurate measurements of the object.

Therefore, Group A makes the most accurate measurements of the object. The correct option is option D.

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Answer:

gallium has orthorhombic and forms ionic bonds with metals

Explanation:

Answer:

it's volume also decrease

Answer: A

Explanation:

First, let's write the half-reactions for the oxidation and reduction processes:

Oxidation half-reaction:

CH₃OH(aq) → CH₂O(aq) (loss of 2H+ and 2 electrons)

Reduction half-reaction:

Cr₂O₇²⁻(aq) → Cr³⁺(aq) (gain of 3 electrons)

Next, we need to balance the number of electrons in each half-reaction by multiplying the oxidation half-reaction by 3 and the reduction half-reaction by 2:

Oxidation: 3CH₃OH(aq) → 3CH₂O(aq) + 6H+(aq) + 6e⁻

Reduction: 2Cr2O7²⁻(aq) + 14H⁺(aq) + 6e⁻ → 2Cr³⁺(aq) + 7H₂O(l)

Now, we can combine the two half-reactions and cancel out the electrons:

3CH₃OH(aq) + 2Cr₂O₇²⁻(aq) + 14H⁺(aq) → 3CH₂O(aq) + 2Cr³⁺(aq) + 11H₂O(l)

Finally, we can check the balance of each element:

Balance Cr: 2 on both sides

Balance H: 14 + 3 = 11 + 6, balanced

Balance O: 14 = 3 + 11, balanced

So the balanced equation is:

3CH₃OH(aq) + 2Cr₂O₇²⁻(aq) + 14H⁺(aq) → 3CH₂O(aq) + 2Cr³⁺(aq) + 11H₂O(l)

The coefficient of water is 11.

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The most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.

What is Half-Life?

Half-life is the time required for a quantity to reduce by half to its initial value. The half-life of any radioisotope is represented by \(t_{1/2}\) .

Americium-241 (²⁴¹Am) is the most common isotope of americium.

Americium-241 has a half-life of 432 years.

Am-241 decays by emitting alpha particles and gamma radiation to become neptunium-237.

Thus, the most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.

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Smoke detectors are the safety devices for fire protection that detects smoke and gives alarms as a warning. The long half-life of the radioisotope would be most practical for the detector.

Radioisotopes are chemical substances that have unstable neutrons, protons and some amount of excess energy. They have a half-life which is the time by which they get reduced or decay to half quantity.

Americium-241 is the radioactive isotope of americium and have a half-life of 432.2 years. It helps in the alarm as the smoke particle disrupt the electric current produced by the isotope and results in the warning of the device to go on.

Therefore, option A. long half-life is the feature that would be most useful for the smoke sensor.

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The double bonds in CO2 are counted as single regions of electron density.

The valence shell electron pair repulsion theory VSEPR  is a description of the shape of molecules based on the number of electron pairs that surround the central atom in the molecule. Double bonds are counted as a single region of electron density.

Hence, the two double bonds in CO2 are counted as two regions of electron density around the central carbon atom. Hence, the molecule is liner at a bond angle of 180 degrees.

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Answer:

2.38 mol of Al

Explanation:

To find the number of moles in a substance, you simply divide by the atomic mass. In this case, the conversion table would look as follows:

\(\frac{64.1 g}{1}\) * \(\frac{1 mol}{26.98 g}\)

The gram units cancel, and you are left with the answer of about 2.38 moles of Aluminum.

According to the graph, only the reactant A was present at the beginning of the reaction.

The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.

In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.

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now that i do and I also believe adopt don't shop and also no puppy mill.

Answer: 1)  Caboxylic acid

2)  Ether

3)  Ester

4)  Aldehyde

5)  Amine

6)  Alcohol

Explanation:  The type of a molecule is based it's primary functional group.  

https://en.wikipedia.org/wiki/Functional_group

The identities of the given molecules shown in the drawing are:

1) Carboxylic acid.

2)  Ether

3)  Ester

4)  Ethane

5) Aldehyde

6)  Amine

7)  Alcohol

Organic compounds are those compounds, which contain carbon-carbon and carbon-hydrogen bonds.

The five organic compounds are lipids, carbohydrates, protein, nucleotide, etc.

Thus, the correct option is 1) Carboxylic acid.

2)  Ether

3)  Ester

4)  Ethane

5) Aldehyde

6)  Amine

7)  Alcohol

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The social process that Nicky used is social referencing. This is when an individual looks to others, in this case, Nicky's mother, for guidance on how to react in a new or uncertain situation.

The social process that Nicky used in the given scenario is social referencing. Social referencing is a psychological term that refers to the act of seeking emotional cues or guidance from others in ambiguous or uncertain situations. It typically occurs when an individual is faced with a new experience or environment and looks to a trusted person, such as a parent or caregiver, to understand how to react or interpret the situation.

In the example you provided, Nicky is observing their mother's facial expression and body language to gauge how they should respond to the clown. By seeking cues from their mother, Nicky is using social referencing to determine whether the clown is safe or potentially threatening. This process allows individuals, especially children, to rely on the social and emotional information provided by others to navigate unfamiliar or potentially challenging situations.

The social process that Nicky used is social referencing. This is when an individual looks to others, in this case, Nicky's mother, for guidance on how to react in a new or uncertain situation. By observing his mother's facial expression, Nicky was able to determine that the stairs may be dangerous and stopped in a safe manner. This is an important developmental milestone for infants and toddlers as they learn to navigate and understand their environment.

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Answer

Atoms in a liquid have more kinetic energy

so the easiest way to change a solid to a liquid is to add heat

When changing from a solid to a liquid, there is a magic temperature for every substance called the boiling point

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Given that the formula for lysergic acid is C6H6N,O2. The percent composition of carbon in the acid is 71.62%.

Given that the formula for lysergic acid is C6H6N,O2.To calculate the percent composition of carbon in the acid, we need to find the molar mass of carbon and the molar mass of lysergic acid.We know that the molar mass of carbon is 12.01g/molMolar mass of Lysergic Acid = (6 x molar mass of carbon) + (6 x molar mass of hydrogen) + (1 x molar mass of nitrogen) + (2 x molar mass of oxygen)Molar mass of Lysergic Acid = (6 x 12.01 g/mol) + (6 x 1.01 g/mol) + (1 x 14.01 g/mol) + (2 x 16.00 g/mol)Molar mass of Lysergic Acid = 268.3 g/molNow, we can calculate the percent composition of carbon in lysergic acid.

Percent Composition of Carbon in lysergic acid = (Number of Carbon atoms x Molar mass of Carbon atoms) / (Total Molar mass of lysergic acid)Percent Composition of Carbon in lysergic acid = (6 x 12.01 g/mol) / 268.3 g/molPercent Composition of Carbon in lysergic acid = 0.267Percent Composition of Carbon in lysergic acid = 26.7 %So, the percent composition of carbon in the acid is 71.62%.

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Answer:

standard pressure is equal to 1 atm.

Explanation:

Yes, the polymerization of ethylene units will result in the polymer polyethylene.

What is Polymerization?

Polymerization is the process of connecting smaller molecules (monomers) to form larger molecules (polymers). As a result, polymers are molecules with very high molecular weights made up of repeating units of smaller molecules known as monomers.

Polymers can be formed in a variety of ways, including addition polymerization, condensation polymerization, and co-polymerization.

Addition Polymerization:

It is a polymerization method in which monomers are combined by breaking the double bond and joining them together. The most well-known example of this is polyethylene. In the presence of a catalyst, ethylene undergoes addition polymerization to produce polyethylene.

Polyethylene:

Polyethylene, also known as polythene, is a polymer that is produced through addition polymerization of ethylene. Polyethylene is a polymer that has a high molecular weight, high density, and is resistant to moisture and chemical attacks.

It is a thermoplastic that is commonly used to create plastic bags, bottles, pipes, and other items.

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Absolute zero is an idea in thermodynamics that describes the lowest energy system.

Thermodynamics

Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.

Absolute zero

Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.

Answer:

I am explain you in image