Complete the paragraph about the formation of sodium phosphide.
Electrons are transferred from atoms of
and the phosphorus atoms
to atoms of
C. This transfer makes the sodium atoms
As a result, the sodium and phosphorus atoms strongly
each other.

Answer:no

Explanation:

Answer: A. Silver chloride

B. Zinc oxide

C. Calcium bromide

D. Strontium fluoride

E. Barium oxide

F. Calcium chloride

Explanation:

Answer:2,2,2,1

Explanation:

Answer:

4SeClO + 2O2 → 4SeO2 + 2Cl2

Answer:

330

Explanation:

110 times 3

The 110 yards length of the field at BBVA Compass Stadium is equivalent to 330 feet when converted using the fact that 1 yard equals 3 feet.

The length of the field at BBVA Compass Stadium in question is 110 yards. We can convert yards to feet by using the fact that 1 yard is equivalent to 3 feet.

Therefore, multiplying 110 yards by 3 yields a result of 330 feet.

This conversion is commonly utilized because yards and feet are both units used in the US customary system of measurement, thus are commonly interchangeable depending on the context or the precision required.

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3. Cl will form ionic compound by gaining one electron from the cation.

Explanation:

The chloride ion can be formed by gaining an electron during ionic bond formation.

Chlorine has 7 electrons in its outermost shell thereby requiring only 1 electron to complete its octet.

Electronic configuration of chlorine is 1S2,2S2,2P6.3S2,3P5

Chloride is an anion formed when chlorine element gains an electron or when compound like NaCl dissolves in water Sodium ions (cation) and chloride ions(anion) is formed.

In ionic compounds only electrons take part ie they move from one atom to another.

Thermal energy transfer shapes the Earth's surface through mantle convection causing geological activity and through the evaporation and precipitation cycle that alters landscapes.

Thermal energy transfer in the Earth can change the landscape in a number of ways. Here are two examples:

In summary, the process of convection within the Earth's mantle and the evaporation and precipitation cycle are crucial for understanding how thermal energy transfer can shape the Earth's surface over time.

Answer:

H₂C₂O₄ + Ca²⁺ ⟶ CaC₂O₄ + 2H⁺

Explanation:

There are three steps you must follow to get the answer.

You must write the:

1. Molecular equation

H₂C₂O₄(aq) + CaCl₂(aq) ⟶ CaC₂O₄(s) + 2HCl(aq)

2. Ionic equation

You write the molecular formulas for the weak electrolytes and solids, and you write the soluble ionic substances as ions.

H₂C₂O₄(aq) + Ca²⁺(aq) + 2Cl⁻(aq) ⟶ CaC₂O₄(s) + 2H⁺(aq) + 2Cl⁻(aq)

3. Net ionic equation

To get the net ionic equation, you cancel the ions that appear on each side of the ionic equation.

H₂C₂O₄(aq) + Ca²⁺(aq) + 2Cl⁻(aq) ⟶ CaC₂O₄(s) + 2H⁺(aq) + 2Cl⁻(aq)

The net ionic equation is

H₂C₂O₄ + Ca²⁺ ⟶ CaC₂O₄ + 2H⁺

The net ionic equation is;  Ca^2+ (aq) + C2O4^2-(aq) -------> CaC2O4(s)

First we must put down the molecular equation as follows;

Na2C2O4(aq) + CaCl2(aq) ------> 2NaCl(aq) + CaC2O4(s)

The total ionic equation is;

2Na^+(aq) + Cl^- (aq) +  Ca^2+ (aq) + C2O4^2-(aq) -------> 2Na^+(aq) +  Cl^- (aq) +  CaC2O4(s)

The net ionic equation is;

Ca^2+ (aq) + C2O4^2-(aq) -------> CaC2O4(s)

The spectator ions in this reaction are Na^+ and Cl^-, they appear on both sides of the reaction equation and they do not appear in the final net ionic equation.

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Answer: 2.71 moles of solute for every 1 kg of solvent.

Explanation: As you know, the molality of a solution tells you the number of moles of solute present for every 1 kg of the solvent.This means that the first thing that you need to do here is to figure out how many grams of water are present in your sample. To do that, use the density of water.500.mL⋅1.00 g1mL=500. g Next, use the molar mass of the solute to determine how many moles are present in the sample.115g⋅1 mole NanO385.0g=1.353 moles NaNO3So, you know that this solution will contain 1.353moles of sodium nitrate, the solute, for 500. g of water, the solvent.In order to find the molality of the solution, you must figure out how many moles of solute would be present for 1 kg=103g of water.103g water⋅1.353 moles NaNO3500.g water=2.706 moles NaNO3You can thus say that the molality of the solution is equal to molality=2.706 mol kg−1≈2.71 mol kg−1 The answer is rounded to three sig figs.

Answer:

                 The bond between XY is Covalent

Explanation:

                    Types of Bonds can be predicted by either identifying the two bonding elements or by calculating the difference in electronegativity.

                     The two atoms bonded to each other can be both metals, non-metals or one metal and the other non-metal. If both are metals then we can say that the bond is metallic. If both are non-metals then we can say that the bond is nonpolar and covalent. If one is metal and the other is non-metal then the bond between them will be ionic.

Secondly,

If, Electronegativity difference is,

              Less than 0.4 then it is Non Polar Covalent  Bonding

              Between 0.4 and 1.7 then it is Polar Covalent  Bonding

              Greater than 1.7 then it is Ionic  Bonding

As, the element X and Y have the electronegativity difference of 1.2 (which is less than 1.7 and greater than 0.4) therefore, we can say that the bond between them is covalent and it is polar in nature.

Final answer:

The bond between element X and Y with a significant difference in electronegativity of 1:2 is likely ionic, especially if the difference is greater than 1.8. Exact values of electronegativity and the types of elements involved would provide a more accurate determination.

Explanation:

The question concerns whether a bond between element X and element Y with a difference in electronegativity of 1:2 will be covalent or ionic. The electronegativity difference helps to predict the bond type. A higher electronegativity difference indicates more ionic character, whereas a lower difference suggests a covalent bond. Since '1:2' is not a standard way to express electronegativity, we can assume it refers to a ratio indicating a significant difference, suggesting that the bond may be ionic. However, the exact nature of the bond would better be determined if the exact electronegativity values were provided, considering that usually electronegativity differences greater than 1.8 lead to an ionic bond.

Additionally, the types of elements involved can provide a clue as to the bond type. For instance, a bond between a metal and a nonmetal often results in an ionic bond whereas a bond between two nonmetals is more likely to be covalent. Bonds with intermediate electronegativity differences are typically polar covalent, where the shared electrons are drawn more towards the more electronegative atom.

Using the ideal gas law, we first calculate the number of moles in the balloon using the initial conditions and then apply the combined gas law to find the new volume under increased ocean pressure. The toy balloon will have a volume of approximately 32.89 mL at the bottom of the ocean with a pressure of 95 atm and contains about 0.129 moles of gas.

To solve for the new volume of the toy balloon at the bottom of the ocean, we will use the ideal gas law and its principle that states the product of pressure (P) and volume (V) is proportional to the number of moles (n) and the temperature (T), represented as PV = nRT, where R is the ideal gas constant. Given the internal pressure of the balloon is 126.625 kPa (which is equivalent to 1.25 atm since 1 atm = 101.325 kPa) and the volume is 2500 mL at the surface, we can calculate the number of moles of gas in the balloon using the ideal gas constant (R = 8.3145 J/mol·K or 0.0821 L·atm/mol·K for calculations involving atmospheres) and the provided temperature of 285 K.

Calculating the number of moles:

Calculating the new volume at the bottom of the ocean:

Now, we apply the combined gas law to determine the new volume (V2) when the pressure is 95 atm

The new volume of the balloon at the bottom of the ocean under 95 atmospheres of pressure would be approximately 32.89 mL, and it contains about 0.129 moles of gas.

The new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas.

To solve this problem, we will use Boyle's Law, which states that for a given mass of gas at constant temperature, the volume of the gas is inversely proportional to the pressure. Mathematically, this can be expressed as:

[tex]\[ P_1V_1 = P_2V_2 \][/tex]

First, we need to convert the final pressure from atmospheres to kPa to match the units of the initial pressure. We know that 1 atmosphere is approximately 101.325 kPa.

[tex]\[ P_2 = 95 \text{ atm} \times 101.325 \text{ kPa/atm} \] \[ P_2 = 9620.875 \text{ kPa} \][/tex]

Now we can use Boyle's Law to find the new volume \( V_2 \):

[tex]\[ P_1V_1 = P_2V_2 \] \[ V_2 = \frac{P_1V_1}{P_2} \] \[ V_2 = \frac{126.625 \text{ kPa} \times 2500 \text{ mL}}{9620.875 \text{ kPa}} \] \[ V_2 \approx 26.75 \text{ mL} \][/tex]

Next, to find the number of moles of gas in the balloon, we can use the ideal gas law:

[tex]\[ PV = nRT \][/tex]

We will use the initial conditions to find \( n \):

[tex]\[ n = \frac{P_1V_1}{RT} \] \[ n = \frac{126.625 \times 10^3 \text{ Pa} \times 2500 \times 10^{-6} \text{ m}^3}{8.314 \text{ J/(mol·K)} \times 285 \text{ K}} \] \[ n = \frac{126.625 \times 2.5 \text{ J}}{8.314 \times 285} \] \[ n \approx 0.117 \text{ moles} \][/tex]

Therefore, the new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas."

The temperature of water is cooler in deep oceans. The temperature there goes to 0°C to -3°C below which the water freezes. The water on the surface of the oceans and deep inside it varies because of the difference in energy of the two layers. One of the widest use of cold water is air conditioning. Cold water has a higher density than warm water. Water gets colder with profundity since chilly, salty sea water sinks to the base of the sea beds underneath the less dense hotter water close to the surface.

Answer:

B) Products

Explanation:

Nitrous oxide is colorless gas.

It is also called laughing gas.

It is used in medicine specially in pain relief.

It is also used by dentists.

Chemical equation:

2N₂O   →   2N₂ + O₂

Here nitrous oxide is converted into nitrogen and oxygen. Nitrous oxide is reactant and nitrogen and oxygen are product.

The given reaction is decomposition reaction of nitrous oxide.

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Answer:

intermediates

Explanation:

Hey gradpoint :)

Answer:4 Fe + 3 O2 => 2 Fe2O3

Explanation: The number of atoms are now balanced.

The balanced chemical equation for rust formation is 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s).

The balanced equation for the formation of rust, which is iron (III) oxide, from iron metal and oxygen gas is represented as:

4 Fe(s) + 3 O2(g) → 2 Fe2O3(s)

This shows that four moles of iron (Fe) react with three moles of oxygen (O2) gas to produce two moles of iron (III) oxide (Fe2O3), which is the principal component of rust. Rusting is a redox reaction where iron is oxidized, and oxygen is reduced. The process is accelerated by the presence of water and electrolytes, leading to the hydrated form of rust represented by Fe2O3 · xH2O(s), where x varies indicating the hydration level.

Rust does not form a protective layer over the iron, which means that unlike the patina on copper, iron continues to corrode as the rust flakes off and exposes the fresh iron underneath to the atmosphere.

Answer:79.904

Explanation:

It's right cause it's right

Answer:

                       5.05 × 10²⁴ Zn Atoms

Explanation:

                    In order to find the number of atoms we will follow these two steps;

Step 1:  Finding out the moles of Zn as;

Moles  =  Mass / A. Mass

Moles  =  549 g / 65.38 g/mol

Moles  =  8.397 moles

Step 2: Calculating No. of Atoms as:

According to Avogadro's Law, each mole contains 6.022 × 10²³ particles. These particles can be any entity i.e. atoms, molecules, formula units, ions e.t.c. So,

No. of Atoms  =  Moles × 6.022 × 10²³ atoms/mol

No. of Atoms  =  8.397 mol × 6.022 × 10²³ atoms/mol

No. of Atoms  =  5.05 × 10²⁴ Zn Atoms

Answer: 1.4 moles Mg(NO3)2

Explanation: Solution attached:

Convert the formula units of Mg(NO3)2 to moles using the Avogadro's number.

Answer:

did you get the answer?

Explanation:

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The mathematical expression of Boyle's law is a constant pressure and constant volume, which can be showed as: P V = k, where P is pressure, V is volume and k is a constant.

According to Boyle's law, the volume of a given mass of a dry gas at constant temperature is inversely proportional to its pressure. At moderate pressures and temperatures, most gases behave like ideal gases.

The technology of the 17th century was incapable of producing extremely high pressures or extremely low temperatures.

This empirical relationship, established in 1662 by physicist Robert Boyle, states that the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; in equation form, pv = k, a constant.

Thus, This means that for a constant pressure, a constant volume must be kept.

To learn more about the Boyle's law, follow the link;

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Answer:

Fluorine, chlorine, bromine and iodine are grouped together because they have the same number of valence electrons.

Explanation:

Fluorine, chlorine, bromine and iodine are all found in group 7, which is the second-last column from the right. Group 7 elements are also called the "Halogens" family.

The group number also tells you the number of valence electrons that the elements have in that group. Valence electrons mean the outermost electrons (See picture).

For example, fluorine has two shells (the circles with dots on them). The outermost electrons, or valence electrons, are the dots on the biggest circle. There are 7 dots, so there are 7 valence electrons, which corresponds with Group "7".

A full shell (except the for first shell) is when there are 8 dots. Since 7 is so close to 8, Halogens are very reactive.

Fluorine, chlorine, bromine and iodine all have 7 valence electrons and are in the Halogens family, which are very reactive.

The elements fluorine, chlorine, bromine, and iodine are grouped together because they belong to the same group on the periodic table and share similar chemical properties.

The elements fluorine, chlorine, bromine, and iodine are grouped together because they belong to the same group on the periodic table.

These elements are part of Group 17, also known as the halogens. They share similar chemical properties due to having the same number of valence electrons.

For example, they all have seven valence electrons, which allows them to easily gain one electron to achieve a stable electron configuration like the noble gas neon.

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Answer: The indivisible unit of matter.

Explanation:

Answer:

The nucleus of the atom takes up most of the space.

Explanation:

The nucleus of the atom is made up of all the protons and neutrons while the rest of it is just the electron cloud which is made up of only electrons which are so much smaller compared to the nucleus that they don't effect its mass what so ever.

Answer: Group 16 elements form ions with a 2 - charge.

Explanation: Therefore each of these elements would gain one electron and become an anion with 1 - charge.

Answer:

P4 + 5O2 —> 2P2O5

Explanation:

Answer:

In a chemical reaction, one or more substances called reactants are combined or  broken down to form products.

Explanation:

Chemical reaction:

In a chemical reaction one or more substance converted into the another substance.

The substances that reacts or combine during the chemical reaction are called reactants while the new species formed as a result of chemical reaction are products.

There are different types of reaction given below:

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

Answer:

Explanation:

These are the main features of the periodic table that you will be able to relate with some property trends of the atoms like size, energy levels, valence electrons, electronegativity, and ionization energy.

A) Features:

1. Elements are arranged in increasing order of atomic number, i.e. number or protons.

2. Since atoms are neutrals, the number of electrons equals the number of protons, and, as result, the elements are arranged in increasing order of number of electrons.

3. The elements are arranged in 18 columns and 7 rows.

4. The rows are named period and correspond to the principal energy level (n): first row corresponds to n = 1, second row corresponds to n = 2, third to n = 3, and so on up to n = 7. The number of elements in each period are:

Period 1, n = 1, 2 elements

Period 2, n = 2, 8 elements

Period 3, n = 3, 8 elements

Period 4, n = 4, 18 elements

Period 5, n = 5, 18 elements

Period 6, n = 6, 32 elements (this includes the 14 lanthanides)

Period 6, n = 7, 32 elements (this includes the 14 lanthanides)

That makes a total of 118 elements.

5. The columns are named groups and they indicate the number of valence electrons

Group 1: 1 valence electron

Group 2: 2 valence electrons

Group 13: 3 valence electrons

Group 14: 4 valence electrons

Group 15: 5 valence electrons

Group 16: 6 valence electrons

Group 17: 7 valence electrons

Group 18: 8 valence electrons

Groups 3 through 12 includ the transition metals and due they have subshells that are not completely filled, their valence electrons vary.

More like a reference than as a rule these are the number of valence electrons for these groups.

Group 3: 3 valence electrons

Group 4: 2-4 valence electrons

Group 5: 2-5 valence electrons

Group 6: 2-6 valence electrons

Group 7: 2-7 valence electrons

Group 8: 2-3 valence electrons

Group 9: 2-3 valence electrons

Group 10: 2-3 valence electrons

Group 11: 1-2 valence electrons

Group 12: 2 valence electrons

B) Property trends

1. Atomic radius (size)

2. First ionization energy

3. Electronegativity

This is the relative ability to atract electrons in a covalent bond. It increases from left to right and from bottom to top: the most electronegative atoms is fluor.

Answer:

Explanation:

Correct statements:

Water boils at a temperature below 100°C at higher altitude.

Water boils at a temperature 100°C under normal pressure.

The density of water decreases on freezing.

Water expend on freezing.

False statements:

Water contract on freezing.

Answer:

                    Liquid B will evaporate quicker.

Explanation:

                     Intermolecular forces (IMP) are the forces of attraction between molecules while intramolecular forces are force of attractions between atoms within a compound. Following are the types of intermolecular forces,

                             (i)  Ion-Dipole Interactions

                             (ii) Hydrogen Bondings

                             (iii) Dipole-Dipole Interactions

                             (iv) Ion-Induced Dipole

                             (v) Dipole-Induced Dipole

                             (vi) Dispersion /London Forces

The physical properties of a compounds strongly depends upon the strength of the IMF. For example, greater the IMF greater will be the melting and boiling point. In given statement the liquid B will evaporate quicker because it has weak interaction with its neighbouring atoms hence, it has weak IMF and easily break the interaction and escape while the liquid A will not do so as it has stronger IMF.

Answer: C4H8

Explanation:Please see attachment for explanation

Final answer:

To find the empirical formula, the moles of C and H are calculated and their ratio determines that the empirical formula is CH₂. The molecular formula is found by dividing the compound's relative formula mass (56 g/mol) by the empirical formula mass (14.026 g/mol), which suggests the molecular formula is C₄H₈.

Explanation:

To calculate the empirical formula of the unknown organic compound, we begin by determining the moles of carbon (C) and hydrogen (H) in the sample. Using the atomic weights of carbon (12.01 g/mol) and hydrogen (1.008 g/mol), we find:

The ratio of moles of hydrogen to carbon is 0.02 mol H / 0.01 mol C = 2:1. Therefore, the empirical formula is CH₂.

To find the molecular formula, we divide the relative formula mass (rfm) of the compound by the empirical formula mass. The empirical formula mass of CH₂ is 12.01 (for 1 C) + 2 * 1.008 (for 2 H) = 14.03 g/mol. Dividing the rfm (56 g/mol) by the empirical formula mass (14.03 g/mol) gives approximately 4. Therefore, the molecular formula is C₄H₈, as we multiply the subscripts in the empirical formula CH₂ by 4.

Answer:

The oxidation states are as follows:

+1 for each H, -2 for each O,

+4 for Se

Explanation: I hope this attachment helps!!

Answer:

[tex]\large \boxed{\text{c = 2.50 mol/L; b = 3.96 mol/kg }}[/tex]

Explanation:

1. Molar concentration

Let's call chloroform C and acetone A.

Molar concentration of C = Moles of C/Litres of solution

(a) Moles of C

Assume 0.187 mol of C.

That takes care of that.

(b) Litres of solution

Then we have 0.813 mol of A.

(i) Mass of each component

[tex]\text{Mass of C} = \text{0.187 mol C} \times \dfrac{\text{119.38 g C}}{\text{1 mol C}} = \text{22.32 g C}\\\\\text{Mass of A} = \text{0.813 mol A} \times \dfrac{\text{58.08 g A}}{\text{1 mol A}} = \text{47.22 g A}[/tex]

(ii) Volume of each component

[tex]\text{Vol. of C} = \text{22.32 g C} \times \dfrac{\text{1 mL C}}{\text{1.48 g C}} = \text{15.08 mL C}\\\\\text{Vol. of A} = \text{47.22 g A} \times \dfrac{\text{1 mL A}}{\text{0.791 g A}} = \text{59.70 mL A}[/tex]

(iii) Volume of solution

If there is no change of volume on mixing.

V = 15.08 mL + 59.70 mL = 74.78 mL

(c) Molar concentration of C

[tex]c = \dfrac{\text{0.187 mol}}{\text{0.07478 L}} = \textbf{2.50 mol/L }\\\\\text{ The molar concentration of chloroform is $\large \boxed{\textbf{2.50 mol/L}}$}[/tex]

2. Molal concentration of C

Molal concentration = moles of solute/kilograms of solvent

Moles of C = 0.187 mol

Mass of A = 47.22 g = 0.047 22 kg

[tex]\text{b} = \dfrac{\text{0.187 mol}}{\text{0.047 22 kg}} = \textbf{3.96 mol/kg }\\\\\text{The molal concentration of chloroform is $\large \boxed{\textbf{3.96 mol/kg}}$}[/tex]

The molarity and molality of a solution can be calculated given the mole fraction of two components, their densities, and molar masses. The acetone will have a larger volume in the solution due to its higher mole fraction. By obtaining the masses of each component for a given volume, the number of moles of each can be calculated and used to compute molarity and molality.

The subject of this question involves the calculation of molarity and molality of a solution. First, let us understand what molarity and molality mean. Molarity (M) is the number of moles of solute per liter of solution. Molality (m) is the number of moles of solute per kilogram of solvent.

Given that the mole fraction of chloroform (Cx) is 0.187, the mole fraction of acetone (Ay) can be calculated as 1 - Cx = 1 - 0.187 = 0.813. From the densities and molar masses of chloroform (119.38 g/mol) and acetone (58.08 g/mol), we can convert these to masses for a given volume. Assuming a total volume of 1 L for the solution, we know that the acetone has more volume due to its mole fraction. We can find the number of moles of each component from these masses, and finally, compute the molarity (moles/L) and the molality (moles/kg).

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Answer:

true ?

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