in an experiment a student wants to heat 72g of ice and convert it to liquid water at 50c how much does the student need?

Answer:

Solution A is neutral and Solution B is basic

Explanation:

Note it down

option c. The statement that is true about trends in metallic character is "metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column.

"Explanation: The metallic character refers to the ability of an atom of an element to donate its electrons to form a metallic bond. Metallic elements can lose electrons easily, have low electronegativity, and are good conductors of heat and electricity. Nonmetallic elements are those that tend to gain electrons, have high electronegativity, and are poor conductors of heat and electricity.The metallic character decreases as you move to the right across a row in the periodic table, and it increases as you move down a column. The decrease in metallic character is due to the increasing effective nuclear charge, which makes it harder to remove electrons from the atoms. As we move down a column, the metallic character increases due to the increase in the atomic size and shielding effect which makes it easier for the atom to lose electrons. Thus, the answer to this question is that the metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column.

The correct answer is: The statement that is true about trends in metallic character is "metallic character decreases as you move to the right across a row in the periodic table and decreases as you move down a column. option c.

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Explanation:

It is the quantity that describes the amount of matter in any sample of matter

Since we are starting from the number of atoms of Nickel, we need to know two sets of formulas:

mass = moles × molar mass

moles = atoms ÷ Avogadro's Number

⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

   mass = [(7.4 × 10¹⁵ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (58.69 g/mol)

             = 7.21 × 10⁻⁷ g

Answer:

55 degrees F - cold water

120 degrees F

the last on I don't know

Answer:

ammonia is the answer

Explanation:

2.54 grams of \(H_{2}O\) will be produced if you react 2.4 grams of \(NH_{3}\)

The chemical reaction is given below.

\(4NH_{3} + 5O_{2}\) → \(4N_{}O + 6H_{2}O\)

Calculation,

Since, 17 grams of \(NH_{3}\) produce 18 grams of \(H_{2}O\).

2.4 grams of \(NH_{3}\) produce 18×2.4/17 grams of \(H_{2}O\).

So, 2.4 grams of \(NH_{3}\) produce 2.54 grams of \(H_{2}O\).

So, the correct option is A.

The process in which one or more chemicals is transform into one or more chemicals is called Chemical reaction.

Example: iron and oxygen reacts with each other to form rust.

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Answer:

32,256g/mol

Explanation:

n= V/Vm

n = 0.25/22.4

n = 0.01

0.01 = 0.36/M

M = 0.36/0.01

The mole fraction of methane can be calculated using the following formula:
Mole fraction of methane = Moles of methane / Total moles of gases in mixture

First, we need to calculate the moles of methane and ethane present in the mixture. We can use the molar masses of each compound to do this:
Molar mass of methane (CH4) = 16.04 g/mol
Molar mass of ethane (C2H6) = 30.07 g/mol

Moles of methane = Mass of methane / Molar mass of methane
Moles of methane = 8.00 g / 16.04 g/mol
Moles of methane = 0.499 mol

Moles of ethane = Mass of ethane / Molar mass of ethane
Moles of ethane = 12.00 g / 30.07 g/mol
Moles of ethane = 0.399 mol

Total moles of gases in mixture = Moles of methane + Moles of ethane
Total moles of gases in mixture = 0.499 mol + 0.399 mol
Total moles of gases in mixture = 0.898 mol

Now we can use these values to calculate the mole fraction of methane:

Mole fraction of methane = Moles of methane / Total moles of gases in mixture
Mole fraction of methane = 0.499 mol / 0.898 mol
Mole fraction of methane = 0.556

Therefore, the mole fraction of methane in this gaseous mixture is 0.556, or 55.6%.

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The percent by volume of the lemon soda in the mixture is 25%.Percent by volume = (Volume of solute / Total volume) x 100 Percent by volume = (25 mL / 100 mL) x 100 = 25%

To find the percent by volume of the lemon soda in the mixture, you need to calculate the volume of the lemon soda relative to the total volume of the mixture. The total volume of the mixture is 25 mL (lemon soda) + 75 mL (orange soda) = 100 mL.
To find the percent by volume of the lemon soda, you can use the following formula:

In this case, the volume of the solute (lemon soda) is 25 mL. The total volume of the mixture is 100 mL.

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Answer:  A.  1,1,1

Explanation:

The coefficients that will balance the equation; NH4OH(aq) →H2O(l) + NH3(g), is 1, 1, 1, because it proves the total number of atoms of each element on the LHS and RHS of the equation are equal, hence balanced.

LHS          RHS

N = 1            1

H = 5          5

O = 1            1

A balanced chemical equation always obeys law of conservation of mass.

A  balanced chemical equation generally obeys to law of conservation of mass. As per this regulation the mass of items should be equivalent to the mass of reactants. A response is supposed to be adjusted when the complete mass of particles on the two sides of the substance response is equal.According to the law of conservation of mass, the mass of the items in a synthetic response should rise to the mass of the reactants.

The law of conservation of mass is helpful for various computations and can be utilized to tackle for obscure masses, such how much gas consumed or delivered during a reaction.They should submit to the Law of conservation of Mass that expresses that matter can't be made or obliterated, it is saved. The mass of the reactants should rise to the mass of the products.Thus, the mass of substances created in a synthetic response is consistently equivalent to the mass of responding substances. Consequently, you really want to have a similar number of each kind of component on each side of a synthetic condition. This is the entire reason for adjusting a synthetic condition.

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The statement 'Science provides only a limited understanding of the supernatural issues such as art, philosophy, or religion" is TRUE because it is based on empirical evidence.

Science can be defined as a body of knowledge derived from applying the scientific method, which allows us to collect empirical evidence about the real world.

Supernatural issues such as art, philosophy, or religion cannot be scientifically explained because they are often based on a subjective point of view.

In conclusion, the statement 'Science provides only a limited understanding of the supernatural issues such as art, philosophy, or religion" is TRUE because it is based on empirical evidence.

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Lauryl alcohol is a nonelectrolyte obtained from coconut oil and is used to make detergents. A solution of 6. 40 g of lauryl alcohol in 0. 200 kg of benzene freezes at 4. 6 ∘C. 183 (g/mol) is the molar mass of lauryl alcohol.

The molar mass of something specific divided by the amount present in the sample gives the molecular weight of a compound. It is a substance's bulk attribute rather than a molecular one. The compound's molar mass represents the average of all of its occurrences.

Which, as a result of the existence of isotopes, commonly change in mass. Most frequently, molar mass is calculated using quality atomic weights, which is a terrestrial average therefore a function of the proportion of each of the constituent atoms' isotopes on earth.

Tb - Ts = Kml\Mms

M =6. 40×5\0.1(5.5-4.6) = 183 (g/mol)

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Answer:

Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the nucleus. The nucleus consists of protons and neutrons.

Explanation:

A chemical element with the atomic number 4 and the symbol Be is known as beryllium. It is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of beryllium.

Any element's atomic number indicates how many protons or electrons are found in that element.

Since beryllium has an atomic number of 4, it is obvious that it contains 4 protons and 4 electrons.

On the other hand, the mass number of an element denotes the total number of protons and neutrons that make up an element's atomic nucleus.

Since beryllium has a mass of nine, there are also nine protons and neutrons in its mass.

Thus, there are 9 - 4 = 5 neutrons in the system.

As a result, there are 4, 4, and 5 protons, electrons, and neutrons present in beryllium, respectively.

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Answer:

10.0 g of AgI will produce 5.28 g of Ag₂S

Explanation:

The balanced equation of the reaction is given below:

2AgI + Na₂S ----> Ag₂S + 2NaI

From the equation of reaction, 2 moles of AgI produces 1 mole of Ag₂S

The moles of a substance is related to its mass by a quantity known as molar mass which is defined as the mass of one mole of that substance.

Molar mass of AgI = (108 + 127) g = 235 g

Molar mass of Ag₂S = (108 × 2 + 32) g= 248 g

Mass of 2 moles of AgI = 2 × 235 g = 470 g

470 g of AgI produces 248 g of Ag₂S

10 g of AgI will produce 248 /470 × 10 g of Ag₂S = 5.28 g

Therefore, mass of Ag₂S produced = 5.28 g

Answer:

I hypothesize that if I water the garden reguarlary, making sure that the plants are not dry, that the plants will thrive. However, if you do not water them, the plants will die.

Explanation:

Hope this helps! :)

Answer:

Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. When they attach to other atoms, some of their electrons change energy levels.

Explanation:

Answer:

\(\boxed {\boxed {\sf 2.61 \ mol \ O}}\)

Explanation:

To convert from grams to moles, the molar mass is used. This number tells us the grams per mole of a substance. It can be found on the Periodic Table. Look for oxygen.

Use this number as a ratio.

\(\frac {15.999 \ g \ O }{ 1 \ mol \ O }\)

Multiply by the given number of moles.

\(41.8 \ g \ O *\frac {15.999 \ g \ O }{ 1 \ mol \ O }\)

Flip the fraction so the grams of oxygen cancel.

\(41.8 \ g \ O *\frac { 1 \ mol \ O }{ 15.999 \ g \ O}\)

\(41.8 *\frac { 1 \ mol \ O }{ 15.999 }\)

\(\frac { 41.8 \ mol \ O }{ 15.999 }= 2.61266329146 \ mol \ O\)

The original measurement of grams has 3 significant figures (4, 1, and 8). Our answer must have the same. For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 1.

\(2.61 \ mol \ O\)

41.8 grams of O has 2.61 moles of oxygen.

Gold is an element that belongs to the periodic table.Elements are the simplest form of substances that can exist, and they cannot be divided into simpler substances by chemical methods. Each element is defined by the number of protons present in the atomic nucleus.

Gold is an element that has 79 protons and is represented by the symbol Au.Gold has several properties that distinguish it from other elements. It is a soft, shiny, dense metal with excellent conductivity. Gold is also a noble metal, meaning it is resistant to corrosion and oxidation and does not react with most acids. Its properties have made it useful for many purposes, including jewelry, currency, and electronics.

Heterogeneous mixtures contain two or more substances that are not uniformly distributed and can be separated by physical means. Solutions are homogeneous mixtures composed of a solute dissolved in a solvent. Compounds are substances composed of two or more elements chemically combined in a fixed ratio. Thus, none of these classifications accurately describes gold.

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Answer:

G

Explanation:

The atmosphere is divided into five different layers, based on temperature. The layer closest to Earth's surface is the troposphere, reaching from about seven and 15 kilometers (five to 10 miles) from the surface. The troposphere is thickest at the equator, and much thinner at the North and South Poles.

answer is G Atmosphere

Answer:

Explanation:

Each time you add a neutron, it adds one mass number to the mass because each neutron and proton weighs approximately 1 amu.

Answer:

The mass increases

Explanation:

When protons and neutrons are added, the mass increases. Electrons, on the other hand, are so small they do not affect the mass.

a. the volume of the gas particle is much smaller than the distance between the gas particles.

Solution: The energy of a molecule does not change when it collides with a container's walls, according to the kinetic theory of gases. Therefore, the assumption is false With the aid of step-by-step solutions offered by experts, you can dispel your concerns and obtain favorable exam results.

The kinetic-molecular theory of gases postulates that ideal gas molecules are perpetually in motion, have a minimal volume, negligible intermolecular interactions, endure collisions that are perfectly elastic.

Keep in mind that ideal gas models are ineffective at low temperatures and high pressures because the gas expands at these conditions.

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Answer: depositing

Explanation:

5.40 × \(10^{24}\) molecules of \(H_{2}O\) can be produced from 0.996 mol of \(C_{8}H_{18}\).

The balanced chemical equation for the complete combustion of \(C_{8}H_{18}\) is: \(C_{8}H_{18}\) + 12.5\(O_{2}\) → \(8CO_{2}\) + 9\(H_{2}O\)

From the equation, 9 moles of \(H_{2}O\) are produced for every mole of \(C_{8}H_{18}\) combusted. Thus, we can calculate the number of moles of \(H_{2}O\) that can be produced from 0.996 mol of \(C_{8}H_{18}\): 0.996 mol \(C_{8}H_{18}\) × (9 mol \(H_{2}O\) / 1 mol \(C_{8}H_{18}\)) = 8.964 mol \(H_{2}O\)

Therefore, 8.964 moles of \(H_{2}O\) can be produced from 0.996 mol of \(C_{8}H_{18}\). To convert moles to molecules, we use Avogadro's number: 8.964 mol \(H_{2}O\) × 6.022 × \(10^{23}\) molecules/mol = 5.40 × \(10^{24}\) molecules of \(H_{2}O\)

Therefore, 5.40 × \(10^{24}\) molecules of \(H_{2}O\) can be produced from 0.996 mol of \(C_{8}H_{18}\).

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Answer:

Elements

Gold, copper

Compounds

Sodium chloride, Sulphur dioxide, Aluminium oxide,

Mixture

Brass, rainwater, distilled water, sugar solution,muddy water

Explanation:

4 hybrid sp3 orbitals

Four sp3 hybrid orbitals emerge from the hybridization of a s orbital with each of the three p orbitals (px, py, and pz).

The binding angle between the sp3 hybrid orbitals is 109.5 degrees. Tetrahedral molecular structure can be explained via sp3 hybridization. It produces four sp3 orbitals, each of which is made up of 75% p character and 25% s character, by the hybridization of the two 2s orbitals and all three of the two 2p orbitals. We shall use carbon as an example because of how important it is to organic chemistry. The three 2p orbitals and the two 2s orbitals of carbon combine to generate four sp3 orbitals. Following an sp3-s orbital overlap, these orbitals join with four hydrogen atoms to form methane. The outcome shape is tetrahedral, since that minimizes electron repulsion.

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1. LiCl (Lithium chloride) CsBr (Cesium bromide) NaCl (Sodium chloride).

3. Group 1 elements, also known as alkali metals, form 1+ ions because they have one valence electron in their outermost energy level.

4. The formula of the sulfide ion is S2-.

5. The ions in NaCl stay together due to electrostatic attraction between the oppositely charged ions.

6. The formula of potassium sulfide is K2S. In this compound, potassium (K+) forms a 1+ ion, and sulfide (S2-) forms a 2- ion.

1. The three ionic compounds from the given list are:

LiCl (Lithium chloride)

CsBr (Cesium bromide)

NaCl (Sodium chloride)

Dot-and-cross diagrams for the three ionic compounds:

2. LiCl:

Li (Lithium) has 1 valence electron while Cl (Chlorine) has 7 valence electrons. The electron from Li is transferred to Cl, resulting in the formation of Li+ and Cl- ions. The dot-and-cross diagram would show Li with no dots and Cl with 8 dots around it.

CsBr:

Cs (Cesium) has 1 valence electron while Br (Bromine) has 7 valence electrons. Similar to LiCl, the electron from Cs is transferred to Br, resulting in Cs+ and Br- ions. The dot-and-cross diagram would show Cs with no dots and Br with 8 dots around it.

3. NaCl:

Na (Sodium) has 1 valence electron while Cl (Chlorine) has 7 valence electrons. Again, the electron from Na is transferred to Cl, forming Na+ and Cl- ions. The dot-and-cross diagram would show Na with no dots and Cl with 8 dots around it.

4. Group 1 elements, also known as alkali metals, form 1+ ions because they have one valence electron in their outermost energy level. These elements have a strong tendency to lose this valence electron to achieve a stable electron configuration similar to the noble gas configuration.

The formula of the sulfide ion is S2-.

5. The ions in NaCl stay together due to electrostatic attraction between the oppositely charged ions. In NaCl, the sodium (Na+) ion has a positive charge, and the chlorine (Cl-) ion has a negative charge. These opposite charges attract each other, forming an ionic bond.

The strong electrostatic attraction between Na+ and Cl- keeps the ions together in a crystal lattice structure.

6. The formula of potassium sulfide is K2S. In this compound, potassium (K+) forms a 1+ ion, and sulfide (S2-) forms a 2- ion. To balance the charges, two potassium ions are required for every sulfide ion.

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