If the internal energy of a system increases but there is no change in temperature, then the system's energy is increasing.

Answer: 1A: F, 2A: T, 3A: F

Explanation: 1A: Science impacts our everyday life in many ways, from the technology we use to text and call, to the medicine we take for headaches and allergies! There are many brances of science that you can specialize in, whether it be studies space or animals!

2A: Scientists are problem solvers, which means they have to be creative.

3A: Everyone is capable of thinking scientifically!

Answer:

[tex]\boxed{3.966 \times 10^{24}\text{ atoms of Ag}}[/tex]

Explanation:

(a) Balanced equation

Cu + 2AgNO₃ ⟶ Cu(NO₃)₂+ 2Ag

(b) Calculation

You want to convert atoms of Cu to atoms of Ag.

The atomic ratio is ratio is 2 atoms Ag:1 atom Cu

[tex]\text{Atoms of Ag} = 19.83 \times 10^{23}\text{atoms Cu} \times \dfrac{\text{2 atoms Ag}}{\text{1 atom Cu}}\\\\= 3.966 \times 10^{24}\text{ atoms of Ag}\\\\\text{The reaction will produce }\boxed{\mathbf{3.966 \times 10^{24}}\textbf{ atoms of Ag}}[/tex]

Answer:

[tex]3.966\times 10^{24} [/tex] pure silver atoms are produced.

Explanation:

[tex]1 mol = N_A=6.022\times 10^{23} mol^{-1}[/tex]

Atoms of copper = [tex]19.83\times 10^{23} [/tex]

Moles of copper = [tex]\frac{19.83\times 10^{23} }{N_A}[/tex]

[tex]=\frac{19.83\times 10^{23} }{6.022\times 10^{23} mol^{-1}}=3.293 mol[/tex]

[tex]Cu + 2AgNO_3\rightarrow Cu(NO_3)_2 + 2Ag[/tex]

According to reaction, 1 mol of copper atoms gives 2 moles of silver atoms.

Then 3.293 moles of moles of copper will give:

[tex]\frac{2}{1}\times 3.293 mol=6.586 mol[/tex]

Number of silver atoms in 6.586 moles of silver:

=[tex]6.586 mol\times 6.022\times 10^{23} mol^{-1}=3.966\times 10^{24} atoms [/tex]

Answer:

0 °C

Explanation:

The melting point of a substance is the temperature at which it changes state from solid to liquid.

Different substance have different melting point.

The melting point of ice at 1 atmosphere of pressure is very  to 0 °C  this is also known as the ice point.

Answer:

0°C

Explanation:

i am a chemistry nerd and that question any chemistry person can answer without questioning there answer.

Answer:

The balance between intermolecular forces and kinetic energy

Explanation:

If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.

If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.

If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.

The balance between intermolecular forces and kinetic energy. thus option D is correct.

Kinetic energy, form of energy that an object or a particle has by reason of its motion.

If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.

If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.

If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.

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The mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.

The given parameters;

The mass of aluminum is calculated as follows;

Q = mcΔt

where;

[tex]m = \frac{Q}{c \Delta t} \\\\m = \frac{8750}{0.9025 \times 66} \\\\m = 146.9 \ g[/tex]

Thus, the mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.

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Answer:

(A) a compound that donates protons .

Explanation:

According to Bronsted-Lowry Model :

(A) a compound that donates protons .

Bronsted-Lowry defines the compound which (A) donates protons as acid.

According to this concept, an acid is a substance that donates hydrogen ion in a chemical reaction. Hydrogen ion is same as a proton as it has only one proton in its atom. According to him, a base is that substance that accepts hydrogen in a chemical reaction.

In a general sense, all proton donors are acids and all proton acceptors are bases. The higher the number of hydrogen ion donated, the more acidic the substance.

Answer:

A. It is a highly basic substance.

Explanation:

Soda ash is the trade name of sodium carbonate (NaCO₃)

Sodium carbonate is a highly basic substance as 100% of the substance is equivalent to 58.48% of sodium oxide.

Its pH is 10.97

It reacts with acids producing a salt, carbon (Iv) oxide and water.

Na₂CO₃₍s₎ + 2HCl₍aq₎ → 2NaCl₍aq₎ + CO₂ +H₂O₍l₎

Answer:

The air pressure in the bottle will change.

Explanation:

According to Gay-Lussac's Law, one of the main gas laws, the pressure of gas is directly proportional to the temperature of the gas. This means that as the temperature of the gas increases, the pressure of the gas will increase as well. Therefore, if you heat a closed bottle, the air pressure inside the bottle will change (increase).

Answer:

Models show how the atoms in a compound are connected.

I just took this instruction so make sure to press that THANKS button!

Final answer:

A chemical formula indicates the types and numbers of atoms in a compound, while a structural formula also shows how atoms are connected. Models, such as ball-and-stick or space-filling, visually represent the geometric arrangement of atoms, with space-filling models showcasing the relative sizes of atoms.

Explanation:

The correct statement that compares and contrasts the information represented by the chemical formula and model of a compound is that both show how the atoms in a compound are connected, but in different ways. A chemical formula, such as the molecular or empirical formula, shows the types and numbers of atoms in a compound but not how they are linked. For more detailed information on atom connectivity, one would look at a structural formula, which includes lines representing bonds between atoms, indicating how atoms are connected in the molecule.

Models of compounds, including stick, ball-and-stick, or space-filling models, provide a visual representation of the arrangement of atoms. A ball-and-stick model displays the geometric arrangement, with sticks representing bonds and balls representing atoms - though not to scale. A space-filling model also represents the three-dimensional arrangement of atoms in a molecule but shows the relative sizes of atoms more accurately than a ball-and-stick model.

Answer:

organism, organ system, organ, tissue, cell

Explanation:

D

I got ir right:)

Final answer:

To find the mass of 0.750 mol of Na3PO4, calculate the molar mass by summing the atomic masses of Na, P, and O, and then multiply the molar mass by the number of moles. The mass is found to be 122.955 g.

Explanation:

To calculate the mass of 0.750 mol of Na3PO4, we first need to determine its molar mass. We sum the atomic masses of all the atoms in the compound:

Na (Sodium) has an atomic mass of 22.99 g/mol, and there are 3 Na atoms.

P (Phosphorus) has an atomic mass of 30.97 g/mol, and there is 1 P atom.

O (Oxygen) has an atomic mass of 16.00 g/mol, and there are 4 O atoms.

The molar mass of Na3PO4 is thus calculated as:

(3 × 22.99 g/mol) + (1 × 30.97 g/mol) + (4 × 16.00 g/mol) = 163.94 g/mol

Now, to find the mass of 0.750 mol of Na3PO4, we use the formula:

Mass = moles × molar mass

Mass = 0.750 mol × 163.94 g/mol = 122.955 g of Na3PO4

Answer:

Single-replacement

Explanation:

The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.

In a single-displacement reaction, sometimes referred to as a single replacement reaction but rather an exchange reaction, one element in a compound would be swapped out for another.

When  one reacts with another kind of element the  it will form different kind of atom or compound is referred as reaction.

The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.

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The general process for coal mining and refining is option C.

Coal mining is carried out by two main processes based on the depth, quality, thickness, and structure of coal seam. Based on the depth, coal seam of less than 180ft to the surface is surface mined while coal seems between 180ft.-300ft. are deep mined. The coal mined is transported to a nearby processing plant using a conveyor, train, ship, etc. where it is washed to remove other component like dirt, sulphur, rocks, etc. and afterwards dried.

Answer:

Some scientists hypothesize that Earth's ozone layer is being damaged by chlorofluorocarbons .

Explanation:

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Answer:

chlorofluorocarbons

Answer:

Moles are the amount of substance containing the same number of chemical units.

Explanation:

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The correct answer is C. Atoms are made up of smaller particles.

Explanation:

John Dalton was an English chemist and physicist mainly known for proposing one of the first formal theories related to atoms by the end of the 19th century. In this theory, Dalton explained atoms were the basic unit for all elements and cannot be divided into smaller participles, also he proposed atoms of the same elements are identical including their masses and those of different elements are different. This means the statement that is not part of Dalton's atomic theory is "Atoms are made up of smaller particles" because for Dalton atoms are the smallest unit and cannot be divided into smaller parts, this was proved as false later as they can be divided into sub-particles.

Answer:

Tincture o iodine.

Explanation:

If a solute is dissolved in a solution that is not water for example, alcohol, ether, carbon disulphide, Carbon tetrachloride and many other carbon based liquids, the resulting solution is classified as a non aqueous solution.

An example of such a solution is tincture of iodine made by dissolving in 1 liter alcohol.

The molarity of iodine is approximately 0.53M

The solution is largely used as a sore disinfectant.

Answer: B

Explanation: on Edg

Intermolecular forces in solids are strongest than in liquids and gases. Gases have the least strong intermolecular forces. Intermolecular forces are weak and are significant over short distances between molecules (determined by Coulomb’s law). The farther away from the molecules the weaker the intermolecular forces. Since molecules in solids are the closest, the intermolecular force between them as the strongest. Conversely, since gas molecules are farthest apart, the intermolecular forces between them are the weakest.

The strength of intermolecular forces varies in solids, liquids, and gases. They are strongest in solids, due to which molecules or atoms are tightly packed. In gases, they are the weakest, allowing for a greater separation of atoms or molecules. Certain factors like the size and identity of the molecules also influence these forces.

Intermolecular forces refer to the attractions between molecules, which determine many of the physical properties of a substance. In solids, liquids, and gases, the strength of these forces varies significantly. In gases, the atoms and molecules are more separated, and intermolecular forces can be almost ignored. On the other hand, in liquids, these forces are strong enough to keep the molecules in contact, but not to prevent them from moving past each other. However, in solids, the intermolecular forces are so strong that the molecules or atoms are tightly packed, making them resistant to changing their shape or volume.

It's important to note that larger and heavier atoms and molecules exhibit stronger dispersion forces (a type of intermolecular force) than smaller and lighter ones. Hence, molecules like F2 and Cl2 are gases at room temperature indicating weaker intermolecular forces, while Br2 is a liquid, and I2 is a solid, representing stronger intermolecular forces. The identity of the molecules also determines the type and strength of the intermolecular attractions possible. Thus, strong intermolecular forces impede vaporization and favor the 'recapture' of gas-phase molecules, resulting in a lower vapor pressure, and vice versa.

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Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form. Water vapour in the atmosphere is often below its boiling point. When water is boiled the water evaporates much faster and makes steam.

Both vapor and gas contains the gaseous molecules. But vapor state contains a second phase too along with gas whereas, gaseous state only contain one component.

Vapor is a state of matter consists of two component. Solid and gas  or liquid and gas. Thus vapor is formed when a gas comes in contact with liquid or solid.

There forms an equilibrium between gaseous state and liquid or solid state. For example water forms water vapor when the liquid water boils to form gases, similarly other liquids such as acids forms their vapor.

Gases such as oxygen, hydrogen, nitrogen etc.  forms only gases and thus have only one component. Thus we used to say nitrogen gas, hydrogen gas etc.

Therefore, vapor is a combination of two states and gas in a single state. Water forms vapor and can be called water vapor but nitrogen is called gas only.

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Answer:  None of the given options .

Explanation:  The chemical formula of Iron (II) hydroxide can be written as

Fe (OH)2

As iron is present in its +2 state and hyrdoxide ion has charge of one negative unit .

Thus iron hydroxide can be written as the above and none of the given options is correct.

Answer:

²³⁵₉₂U

Explanation:

Properly writing the equation we have:

       ²³⁹₉₄Pu → ᵃₙX + ⁴₂He

The unknown atom here is X with mass number "a'' and atomic number ''n''

In balancing chemical equations, the mass number and atomic number must be conserved. This implies that the sum of atomic numbers i.e subscript on the left hand side must be equal to that on the right hand side. Also, the sum of the mass numbers i.e superscript on the left hand side must be equal to that on the right hand side.

For the mass numbers:

       239 = a + 4

      a = 239 - 4 = 235

For atomic numbers:

     94 = n + 2

      n = 94 -2 = 92

The atom X, has a mass number of 235 and an atomic number of 92.

This is can be written as ²³⁵₉₂X

This is option 3

Answer:

8.69 mol.

Explanation:

where, P is the pressure of the gas in atm (P = 11.0 atm).

V is the volume of the gas in L (V = 12.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 185.0 K).

∴ n = PV/RT = (11.0 atm)(12.0 L)/(0.0821 L.atm/mol.K)(185.0 K) = 8.69 mol.

Answer:

d. synthesis

Explanation:

it uses the formula a+b=ab.

Answer:

synthesis

Explanation:

A + B → AB

A simple example of a synthesis reaction is the formation of water from its elements, hydrogen, and oxygen:

2 H2(g) + O2(g) → 2 H2O(g)

Answer:

356.484 g.

Explanation:

M = (no. of moles of NaCl)/(volume of the solution (L))

M = 6.10 M, volume of the solution = 1.0 L.

∴ No. of moles of NaCl = (M)(volume of the solution (L)) = (6.10 M)(1.0 L) = 6.10 mol.

∵ no. of moles of NaCl = (mass of NaCl)/(molar mass of NaCl)

∴ Mass of NaCl = (no. of moles of NaCl)(molar mass of NaCl) = (6.10 mol)(58.44 g/mol) = 356.484 g.

NaCl mass : 356.85 grams

Stoichiometry in Chemistry learn about chemicals mainly emphasizes quantitative, such as the calculation of volume, mass, number, which is related to numbers, molecules, elements, etc

Mole

The mole itself is the number of particles contained in a substance amounting to 6.02.10²³

Mole can also be sought if the amount of substance mass and its molar mass is known

[tex] \large {\boxed {\boxed {\bold {mol = \frac {mass} {molar \: mass}}}} [/tex]

known

M NaCl = 6.10 M

Volume = 1.00 L

asked

NaCl mass

solution

molar mass of NaCl: 23 + 35.5 = 58.5 g / mol

mole NaCl = gram / mass

mole NaCl = molarity x volume

mol of NaCl = 6.1 x 1

mole of NaCl = 6.1

NaCl mass = molar mass x mol

mass of NaCl = 58.5 x 6.1

mass of NaCl = 356.85 grams

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Keywords: mole, NaCl, volume, molarity

Answer:

nglos324 - fe3c. Iron carbide is an interstitial compound of iron and carbon with the composition Fe- 6.68 wt % Carbon. It is a brittle ceramic material and is produced in carbon steels or cast irons during pseudo-equilibrium cooling from above the eutectoid temperature (723 C).

Explanation:

Answer:

iron n chlorine

Explanation:

Answer:

The compound FeCl3 is made of IRON AND AND CHLORINE

C) It goes up by one

An atom becomes an ion to achieve electrical stability. This can occur either by the atom losing electrons and becoming a cation (positive ion), or gaining electrons and becoming an anion (negative ion). This process, known as ionization, typically happens during chemical reactions.

An atom may become an ion in pursuit of electrical stability. Atoms are originally neutral, containing equal numbers of protons (positive charge) and electrons (negative charge). Certain atoms become more stable by gaining or losing electrons, altering the balance between protons and electrons and creating a net charge, thereby becoming ions.

There are two types of ions: cations and anions. Cations are positive ions that form when an atom loses electrons. For instance, a sodium atom (Na) could lose one electron to become a cation (Na+). On the other hand, anions are negative ions formed when an atom gains electrons. For example, an oxygen atom could gain two electrons to become an anion (O2-).

The process where an atom gains or loses electrons to form ions is known as ionization. This atomic transformation usually occurs during chemical reactions, especially in the formation of ionic bonds.

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Answer: 32/16S which is sulfur

The isotopes that carry the exact same number of neutrons as they are in phosphorous-31 would be:

32/16S

Thus, 32/16S is the correct answer.

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To calculate the heat absorbed by the water, we use the formula Q = mcΔT, where Q represents the heat energy absorbed, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Substituting the given values, we find that approximately 136,872 joules of heat are absorbed to raise the water's temperature from 25°C to 100°C.

This question is asking how much heat energy, in joules, is required to heat 435 grams of water from 25°C to 100°C at atmospheric pressure. The formula used to calculate this is Q = mcΔT, where Q represents the heat energy absorbed, m is the mass of the substance (water), c is the specific heat capacity, and ΔT is the change in temperature.

For water, the specific heat capacity (c) is 4.184 J/g°C. The mass (m) of the water is given as 435 g. The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 100°C - 25°C = 75°C.

Substituting these values into the equation gives us, Q = (435 g) × (4.184 J/g°C) × (75°C), which equals approximately 136,872 joules. This is amount of heat absorbed by the water to raise its temperature from 25°C to 100°C at 1 atm.

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