Sarah and Keith are making candy for a holiday party and begin to argue about whether the melting sugar is a chemical or physical change. Keith says his teacher, Ms. Ortega, said physical changes are only a change in the state of matter, not a change in the chemicals that make up the material. Sarah argues that melting sugar is a change in the chemical makeup of the sugar because it doesn't look like sugar anymore. Who is right?

Answer:

The simplest way to describe climate is to look at average temperature and precipitation over time. Other useful elements for describing climate include the type and the timing of precipitation, amount of sunshine, average wind speeds and directions, number of days above freezing, weather extremes, and local geography.

Explanation:

hope it helps

Therefore, the correct statements that account for the differences in boiling point between NH3 and PH3 are B) NH3 forms hydrogen bonds, and PH3 does not. and C) PH3 forms stronger dipole-dipole interactions than NH3.

Option B) NH3 forms hydrogen bonds, and PH3 does not. and Option C) PH3 forms stronger dipole-dipole interactions than NH3. are both statements that account for the differences in boiling point between NH3 and PH3.Option A) PH3 is ionic, and NH3 is covalent. is incorrect because both PH3 and NH3 are covalent compounds.Option D) PH3 forms weaker dispersion forces than NH3. is incorrect because PH3 and NH3 are both polar molecules and form dipole-dipole interactions.Option E) PH3 forms dispersion forces, and NH3 does not. is incorrect because both PH3 and NH3 form dispersion forces.

Learn more about boiling point:

https://brainly.com/question/2153588

#SPJ4

An acid is a molecule that can donate free \(H^{+}\) ions, thereby lowering the pH of a solution.

Acids are substances that can release hydrogen ions (\(H^{+}\)) when dissolved in water or in an aqueous solution. When an acid donates an H+ ion, it increases the concentration of  \(H^{+}\) ions in the solution, which leads to a decrease in pH. pH is a measure of the acidity or alkalinity of a solution, with lower pH values indicating higher acidity.

Acids can be classified as strong acids or weak acids based on their ability to donate \(H^{+}\) ions. Strong acids completely dissociate in water, releasing a high concentration of \(H^{+}\) ions. Examples of strong acids include hydrochloric acid and sulfuric acid. Weak acids partially dissociate in water, resulting in a lower concentration of \(H^{+}\) ions. Examples of weak acids include acetic acid and citric acid.

When an acid donates an\(H^{+}\) ion, it can react with other substances or molecules, leading to various chemical reactions and changes in the properties of the solution. Acids are widely used in various industries, research, and everyday life, playing important roles in processes such as digestion, chemical synthesis, pH regulation, and more.

Learn more about  pH here:

https://brainly.com/question/2288405

#SPJ11

Complete question: What is an acid?

A molecule that can accept free H+ to a solution and increases its pH.

None                                            

A molecule that can donate free H+ and lower its pH.

A molecule that can donate free H+ and increases its pH

A molecule that can accept free H+ to a solution and lower its pH.

Answer:

The coefficient of the Ammonia gas is 2

Explanation:

N2 + H2 ==>  NH3

Put a 2 in front of the NH3 to get the Ammonia balanced with the right number of nitrogens.

N2 + H2 ==>  2NH3

Now the problems is the hydrogens. There are 2 on the left and 2*3=6 on the right. The number of hydrogens is the number in the molecule * the balance or 3 * 2 = 6

But you have 2 in the hydrogen molecule. So you need 3 more molecules.

N2 + 3H2  ==>  2NH3

Answer:

The Answer is Precipitation

Explanation:

Look it up on and then also got it right on the Unit Test and the Quiz.

The diagram illustrates the water cycle, the process that occurs at location W is precipitation. The correct option is a.

Precipitation is any product of the condensation of atmospheric water vapour that falls under gravitational pull from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail.

Precipitation occurs when a portion of the atmosphere becomes saturated with water vapour so that the water condenses and precipitates or falls. Thus, fog and mist are not precipitation but colloids, because the water vapour does not condense sufficiently to precipitate. Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapour to the air. Precipitation forms as smaller droplets coalesce via collision with other raindrops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called showers.

Precipitation is a major component of the water cycle and is responsible for depositing the fresh water on the planet.

Learn more about precipitation, here:

https://brainly.com/question/18109776

#SPJ6

Answer:

The processes of digestion include five activities: Ingestion, Digestion, absorption, assimilation and egestion.

Ingestion- Ingestion is the consumption of a substance by an organism. In animals, it normally is accomplished by taking in a substance through the mouth into the gastrointestinal tract, such as through eating or drinking. In single-celled organisms ingestion takes place by absorbing a substance through the cell membrane.

Digestion- Digestion is the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive. The digestion process also involves creating waste to be eliminated.

Absorption- The simple molecules that result from chemical digestion pass through cell membranes of the lining in the small intestine into the blood or lymph capillaries. This process is called absorption.

Assimilation- Assimilation is the movement of digested food molecules into the cells of the body where they are used. For example: amino acids are used to build new proteins.

Egestion- Egestion is the act of excreting unusable or undigested material from a cell, as in the case of single-celled organisms, or from the digestive tract of multicellular animals.

The chemical formula is the best representation for obtaining a quick overview of the number of each element in a compound. A chemical formula is a symbolic representation of a compound's chemical composition that indicates the number and type of atoms present in the compound. In general, chemical formulas use chemical symbols and numerical subscripts to express the composition of a compound.

The chemical symbols represent the atoms of each element in the compound, while the numerical subscripts indicate how many atoms of each element are present. A chemical formula can be represented in a variety of ways. The most common form of a chemical formula is empirical formula, which expresses the relative number of each element in the compound in the lowest integer ratios. Another way of representing a chemical formula is a molecular formula, which provides the exact number of atoms of each element in the compound.

To know more about integer ratios visit

https://brainly.com/question/24055119

#SPJ11

The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

Learn more about brine: https://brainly.com/question/14667236

#SPJ11

The oxidation number of hydrogen in H2 reactant will be 0.

The number assigned to each element in a chemical combination would be the simplest definition of the oxidation number. The amount of electrons that atoms in a molecule could share, lose or gain during forming chemical connections with other atoms of such a particular character would be known as the oxidation number.

Hydrogen can be considered as free elements and it is known that free elements have 0 oxidation number .Here, H2 element is also as a free element. So, it has 0 oxidation number.

To know more about oxidation number

https://brainly.com/question/25736364

#SPJ1

1.2 × 10²³ molecules are there in 24 grams of  FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.

A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.

The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.

First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.

Moles are determined from the molecular weight.

For FeF₃ molecule,

55.8 + 3⋅19 = 116g/mole

24 gram /  116g/mole

= 0.207 moles of  FeF₃

= 0.207 moles × 6.023 × 10²³

= 1.2 × 10²³ molecules

Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.

To learn more about the mole, follow the link;

https://brainly.com/question/7805384

#SPJ9

Answer:

The 2 one

Explanation:

The summary equation for cellular respiration is:

C6H12O6 + 6 O2 → 6CO2 + 6H2O + energy

The main component of cellular respiration is glucose, a simple sugar molecule. Glucose is the primary fuel molecule used in cellular respiration. In the presence of oxygen, glucose is broken down in a series of steps, releasing energy that is used to generate ATP, the energy currency of the cell.

Glucose is oxidized to form carbon dioxide, water, and ATP through a complex series of enzyme-catalyzed reactions. This equation represents the process by which cells convert glucose and oxygen into carbon dioxide, water, and energy, which can be used for cellular functions.

Find out more on cellular respiration here: https://brainly.com/question/28009578

#SPJ1

Answer:

Answer is 3 because NaCo3 because NaCo3 is ionic compound and electrons of ionic compound are gained / lost

The amount of iron that can be recovered from 25.0 g of Fe₂O₃ is approximately 17.42 g.

To determine the amount of iron that can be recovered from 25.0 g of Fe₂O₃, you will need to use stoichiometry and the concept of molar mass.

First, find the molar mass of Fe₂O₃:
Fe = 55.85 g/mol (2 Fe atoms) and O = 16.00 g/mol (3 O atoms)
Fe₂O₃ = (2 x 55.85) + (3 x 16.00) = 159.70 g/mol

Next, convert the given mass of Fe₂O₃ to moles:
25.0 g Fe₂O₃ x (1 mol Fe₂O₃ / 159.70 g Fe₂O₃) ≈ 0.156 moles of Fe₂O₃

According to the balanced chemical equation, 1 mole of Fe₂O₃ will produce 2 moles of Fe:
Fe₂O₃ → 2Fe + 3/2 O₂

Now, use the stoichiometry to find moles of Fe produced:
0.156 moles Fe₂O₃ x (2 moles Fe / 1 mole Fe₂O₃) ≈ 0.312 moles of Fe

Finally, convert the moles of Fe to grams:
0.312 moles Fe x (55.85 g/mol Fe) ≈ 17.42 g

Thus, approximately 17.42 g of iron can be recovered from 25.0 g of Fe₂O₃.

Learn more about stoichiometry here: https://brainly.com/question/30820349

#SPJ11

Answer:

A. covalent bond

Explanation:

Hope this helps out!

Answer:

acute propafol intoxication

Explanation:

acute propafol intoxication

436 kelvin = C. 163 °Celcius

To convert from Kelvin (K) to Celsius (°C), you need to subtract 273.15 from the given temperature in Kelvin.

In this case, to convert 436 K to °C, you would perform the following calculation:

436 K - 273.15 = 162.85 °C

Therefore, 436 K is equivalent to 162.85 °C.

The Kelvin scale is an absolute temperature scale where 0 K represents absolute zero, the point at which all molecular motion ceases. The Celsius scale, on the other hand, is a relative temperature scale with 0 °C representing the freezing point of water and 100 °C representing the boiling point of water at standard atmospheric pressure.

When converting from Kelvin to Celsius, we subtract 273.15 because the Kelvin scale starts at absolute zero and the Celsius scale starts at the freezing point of water.

In this case, the conversion tells us that a temperature of 436 K is equivalent to 162.85 °C, indicating that it is a relatively warm temperature on the Celsius scale. Therefore, Option C is correct.

The question was incomplete. find the full content below:

436 k = ___ °C

A. 709

B. 336

C. 163

D. 536

Know more about temperature here:
https://brainly.com/question/27944554

#SPJ8

Option (b) is correct. Amides are the derivative of amines and carboxylic acids.

Amides are the derivatives of carboxylic acid and amines. A carboxylic acid contains the  −COOH  functional group, and in an amide the  −OH  part of that group is replaced by an  −NH2  group. So, amides contain the  −CONH2  group. Any member of either of two classes of nitrogen-containing compounds related to ammonia and amines. The covalent amides are neutral or very weakly acidic substances formed by replacement of the hydroxyl group (OH) of an acid by an amino group NR2, in which R may represent a hydrogen atom or an organic combining group such as methyl, CH3. Among the amides of commercial importance are acetamide and dimethylformamide HCON(CH3)2, which are used as solvents, the sulfa drugs, and the nylons.

To learn more about Amides please visit:

https://brainly.com/question/11622057

#SPJ4

The silica tetrahedron is formed of 4,1 oxygen

1) The silica tetrahedron is formed of 4,1 oxygen and 1,4 silicon atoms.

2) The mineral that would produce the weakest material to build on is (b) muscovite.

3) Quartz has a value of (b) 7 on the Mohs hardness scale.

4) Energy resources is one of the grand challenges engineers will face in the future.

5) When water mixes with anhydrite, it can form (b) gypsum.

Gypsum is a hydrated calcium sulfate mineral that forms when anhydrite reacts with water.

This reaction leads to the formation of gypsum crystals, which can have various applications in construction and industry.

The formation of gypsum is a result of the water molecules incorporating into the anhydrite structure, resulting in the hydration of the mineral.

To know more about silica tetrahedron refer here

brainly.com/question/11946461#

#SPJ11

Answer:

37.94  × 10²³ molecules of ammonia.

Explanation:

Given data:

Mass of ammonia = 107.1 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles of ammonia.

Number of moles = mass/molar molar mass

Number of moles = 107.1 g/  17 g/mol

Number of moles = 6.3 mol

Now we will use the Avogadro number to calculate the number of molecules.

 It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

6.3 mol  × 6.022 × 10²³ molecules / 1mol

37.94  × 10²³ molecules of ammonia.

The correct statement that describes a difference between graphene and graphite is:

(b) Graphene is a single sheet of carbon atoms, and graphite contains many, and larger, sheets of carbon atoms.

Graphene is a two-dimensional sheet consisting of a single layer of carbon atoms arranged in a hexagonal lattice. It is the basic structural unit of graphite.

On the other hand, graphite is composed of multiple layers of graphene stacked on top of each other.These layers can easily slide past one another due to weak interlayer forces, giving graphite its characteristic slippery feel.

Option (a) is incorrect because both graphene and graphite are composed of carbon atoms.

Option (c) is incorrect as graphene is a good conductor of electricity, while graphite is also a good conductor but not a metal.

Option (d) is incorrect because both graphene and graphite are forms of carbon.

Option (e) is incorrect because both graphene and graphite have carbon atoms that are sp2 hybridized.

To know more about graphene refer here

brainly.com/question/29335420#

#SPJ11

Answer: The four seasons happen because of the tilt of the Earth's axis. At different times of the year, the sun's rays hit different parts of the globe more directly. The angle of the Earth's axis tilts the Northern Hemisphere towards the sun during the summer.

Explanation: I am not gonna tell u what exactly to pick but this should give an idea okai? Hope I can help u :)

Answer:

so whats the answer?

Explanation:

Answer: I think it's  A

Explanation:

Answer:

The hot water was better for removing the oil.

Explanation:

You can see that because the mass went down more with the hot water. So, that means that more oil was taken out of the feather with hot water.

Answer:

The mass changed from 1.1grams to 4.5 grams. The appearance is another thing that changed when it got dipped in oil. The feather look like it lost some feathers or the feathers became transparent. The feather just looks soggy and heavier overall.  I believe that if Natalia dips the feather covered in oil in cold water, the feather will remain the same. If she were to dip it in hot water, the feather will get rid of the oil mostly. Think about it, in the ocean the water is cold right? So when oil spills in the ocean it will stay there. Hot water is the best to remove the oil from the feather.

Explanation:

Hopefully this will help.

Answer:

the answer is Fructose

Explanation:

the reason is because when it brakes down it forms a sort of fructose

Explanation:

Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity. The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons. So, noble gases cannot participate in ionic bond formation.

Answer:

Because they can't!

Explanation:

For ionic bonds, ions are needed to be made which are made to form a stable outer shell octet of electrons of each atom to gain atomic stability. The noble gases don't need to form ions since they already have the octet of electrons in their outer shells. If they don't form ions, they don't form ionic bonds too.

This is one of the reasons why noble gases are unreactive.

#giveathanks

Answer:

Explanation:

You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.

The molarity of sodium ions is 0.118

Molarity (M) is the amount of a substance in a sure extent of solution. Molarity is described because the moles of a solute are in keeping with the liters of an answer. Molarity is also referred to as the molar concentration of an answer.

The molarity of a given solution is described as the overall quantity of moles of solute per liter of answer. The molality of an answer is depending on the adjustments in physical properties of the machine along with strain and temperature as unlike mass, the volume of the gadget adjusts with the change in bodily situations of the gadget. Molarity is represented through M, that's termed as molar. One molar is the molarity of a solution wherein one gram of solute is dissolved in a liter of answer.

To learn more about Molarity visit here:

brainly.com/question/26921570

#SPJ4

Answer:

The highest energy level in which you would find electrons in a ground state chlorine atom is the third energy level.

Explanation:

The highest energy level in which you would find electrons in a ground state chlorine atom is the third energy level.