If 1219 Joules of heat raise the temperature of 250g of metal by 64degreesC. What is the specific heat of the metal in J/g degreesC

Explanation:

First, let's discover the quantity in moles of 25.2 g of HNO3. For this, we use the following formula: n = m/MM

MM of HNO3 = 63 g/mol

m = 25.2

n = 25.2/63

n = 0.4 moles

Now using the following formula: M = n/V

We can find the molarity of the solution:

n = 0.4 moles

V = 1L

M = 0.4/1

M = 0.4 mol/L

Answer: 0.4 mol/L

In order to find an empirical formula of a compound with a given percent composition of the elements that compose this molecule, we need so start by assuming an initial mass of 100 grams (it can be any value, but we usually choose 100 grams because it is easier to work on)

Now, if this compound has 100 grams, we can find the mass of each element and with that information, we can find the number of moles of each one

The definition of definite shape and volume is a definition of the solid state of matter. The molecules of the compound are so tightly bound that they maintain their shape regardless of the container in which they are contained.

Within the options we see a liquid (l), two gases(g), and a solid described with the suffix s, this is the I2(s), therefore this will be the correct option.

Answer: a. I2(s)

In this question, we have a situation in which we have to use the Calorimetry formula, which is how much heat was released or absorbed (in Joules), after we had a change in temperature of a compound. The formula for this Calorimetry question is:

Q = mcΔT

Where:

Q = is energy as Heat

m = mass in grams, 77.8 grams

c = is the specific heat capacity, 4.184 J/g°C this is for water

ΔT = the change in temperature, calculated as Final Temperature - Initial T

73.8 - 9.3 = 64.5°C

It is important to know that the heat released by the cracker is the same heat absorbed by water but with an opposite mathematical sign, so we have to find out the heat absorbed by water:

Q = 77.8 * 4.184 * 64.5

Q = 20995.7 J is the heat absorbed by water

Therefore the heat released by the cracker is - 20,995.7 J

Answer

The chemical formula(s) are:

Carbonic acid is H₂CO₃

Bicarbonate is HCO₃⁻

Carbonate is CO₃²⁻ and

Calcium carbonate is CaCO₃

The chemical reaction that produces each of these molecules are:

CO₂ + H₂O ⇄ H₂CO₃ ⇄ HCO₃⁻ + H⁺ ⇄ CO₃²⁻ + H⁺

Ca²⁺ + CO₃²⁻ → CaCO₃

Explanation

Chemical name Chemical formula

Carbonic acid H₂CO₃

Bicarbonate HCO₃⁻

Carbonate CO₃²⁻

Calcium carbonate CaCO₃

Carbonic acid, (H₂CO₃) is a compound formed in small amounts when its anhydride, carbon dioxide (CO₂), dissolves in water.

Bicarbonate (HCO₃⁻) forms when a positively charged ion attaches to the negatively charged oxygen atoms of the ion, forming an ionic compound.

H₂CO₃, HCO₃⁻, and CO₃²⁻ can be formed as shown in the chemical equation below.

CO₂ + H₂O ⇄ H₂CO₃ ⇄ HCO₃⁻ + H⁺ ⇄ CO₃²⁻ + H⁺

In the presence of a calcium ion, (Ca²⁺) from hard water, carbonate, (CO₃²⁻) will combine with it to form calcium carbonate.

Ca²⁺ + CO₃²⁻ → CaCO₃

The second ionization energy is always greater than the first one. So, the answer is between 1450and 6900 kJ/mol.

Each ionization energy means the energy that it takes to separate the outer electron from the atom. In this case, the best estimation of the second ionization energy is 6900 kJ/mol because it would take more than double the first ionization energy.

Therefore, the answer is d.

Step 1 - Finding the stoichiometry of the reaction

The given reaction is:

To find the stoichiometry of the reaction in moles, we just have to "read" the bigger numbers that come before the formulas of the substances:

1 mole of C5H12 reacts with 8 moles of O2 thus producing 5 moles of CO2 and 6 moles of H2O

Since the exercise is specifically asking us about the relation between C5H12 and CO2, we can simplify this statement to:

1 mole of C5H12 produces 5 moles of CO2

Step 2 - Converting this relation to a relation in grams

To convert moles to grams, we just need to multiply the number of moles by the molar mass of the substance.

Since the exercise is giving us the mass of C5H12, it would be interesting to convert its number of moles to mass (its molar mass is 72 g/mol):

We can now rewrite the statement in step 1 as:

72g of C5H12 produce 5 moles of CO2

Step 3 - Finding how many moles of CO2 will be formed

To find the moles of CO2 that will be formed, we can set the following proportion:

Step 4 - Converting moles to volume

The molar volume of a gas in STP conditions (standard pressure and volume) is 22.4 L/mol, which means that each mole of gas occupies 1 L. Since we have formed 1.07 moles of CO2, we have:

The volume of CO2 that would be formed is thus 23.96L.

Answer

The Density of a substance can change if its location changes.

Explanation

All the statements are TRUE except

The Density of a substance can change if its location changes.

This is because density is an intensive property, that is regardless of the object's shape, size, or quantity, the density of that substance will always be the same. Even if you cut the object into a million pieces, they would still each have the same density.

Therefore, the statement that is FALSE is

The Density of a substance can change if its location changes.

ANSWER

Mg(OH)2 is a base

STEP-BY-STEP EXPLANATION:

Firstly, we need to define the word "acid and base"

An acid is a substance that will produce hydrogen ion as the only positive ion when dissolved in water

WHILE

A base is a substance that can neutralize the acid by reacting with hydrogen ions to produce salt and water. A base also contain hydroxyl ion (OH)

From the above definition, you will see that Mg(OH)2 is a base

To solve this problem we have to use the rule of dilutions:

Where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume and C2 is the final concentration.

In this case, we need to find V1. Solve the equation for V1 and then replace C1 for 3.75M, V2 for 190mL and C2 for 0.300M:

It means that the volume required is 15.2mL.

N2 (g) + O2 (g) =======> 2 NO (g) AH = 180kJ

Don't forget to balance the reaction.

This is an endothermic reaction because it needs heat to produce and the sign + of AH

Some reactions absorb enthalpy and others free heat.

We can find the mass of N2 using this enthalpy:

N2 (g) + O2 (g) =======> 2 NO (g) AH = 180kJ

x (grams) AH = 88 kJ

First, we calculate the molecular mass of N2:

Molar mass N2 = 28.01 g / mole so,

1 mol N2 = 28.01 g N2

Now:

28.01 g of N2 ----------------------- absorb 180kJ (stoichiometry)

x (we need this)----------------------- 88 kJ (is real)

The mass of aluminum used if 0.1 moles of aluminum chloride is produced by reacting aluminum with an acid is 2.69 g.

given that :

number of moles of aluminum chloride = 0.1 moles

The balanced reaction is given as :

2Al    +    6HCl  ----->    2AlCl₃     +  H₂

it is clear from the reaction that:

2 moles of Al produce 2 moles of AlCl₃  

the mole ratio is 2 : 2

mean moles of Al = 0.1

molar mass of Al = 26.9 g/ mol

mass of Al = number of moles × molar mass

                  = 0.1 × 26.9

                  = 2.69 g

Thus, The mass of aluminum used if 0.1 moles of aluminum chloride is produced by reacting aluminum with an acid is 2.69 g.

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A magnet turned into a temporary magnet is It has to have opposite magnetic poles. Option C.

Temporary magnets are made of soft metals that become magnetized only when exposed to a permanent magnetic field or electric current. When they come into contact with a magnetic field, they become magnetized. Temporary magnets are made of soft metals that retain their magnetism only when in proximity to a permanent magnetic field or electric current.

They are magnetized in the presence of a magnetic field. Clips, iron nails, and other similar items are examples of temporary magnets. The force that a magnet exerts on a particular substance, including other magnets, is called magnetic force. Forces act over distance and include attraction and repulsion. The north and south poles of two magnets attract each other but the two north poles or the two south poles repel each other.

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As per the given statement 0.297mol NO can be made when 75 moles of HNO3 are consumed

The inorganic substance with the formula HNO3 is nitric acid. It is a mineral acid that is quite corrosive. The substance is colourless, but older samples have a tendency to have a yellow cast because of breakdown into nitrogen oxides..

'3 Cu + 8HNO3      3 Cu(NO3)2 + 2 NO + 4H₂O

Element  Molar Mass

Hydrogen 1

Nitrogen 14

Copper 63.5

Oxygen 16

Referring  the above table we get  no of moles in HNO3

1(1.0) + 1(14) + 3(16) = 1 + 14 + 48 = 63 g/mol

75g HNO3 x 1 mol HNO3/63 g HNO3 = 1.190 mol HNO3

The coefficient of HNO3 is 8, and NO is 2

1.190 mol HNO3 x 2 mol NO/8 mol HNO3 = 0.297mol NO

Hence, 0.297mol NO can be made when 75 moles of HNO3 are consumed.

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In order to convert a temperature in celsius to a temperature in Fahrenheit, we need to use the following conversion formula:

(°C*9/5) + 32

Now we use the 57°C value in the formula:

(57 * 9/5) + 32

(513/5) + 32

102.6 + 32

134.6

The temperature of 57° in Fahrenheit will be 134.6°

A physical model is a replica that has been built that is intended to represent the original object. A physical model may be the same size as the real object it represents, smaller, or larger. A scale model is one that is either bigger or smaller than the real thing.

A physical model is a streamlined tangible depiction of an object or phenomenon that has to be studied, typically on a smaller scale.

The model can replicate the relevant physical factors (temperature, waves, speed, etc.) and forecast the unique limits of the circumstance. Before starting the last stages of a project, these constraints can be considered, tested, and solutions implemented.

Urban planning, naval construction, aeronautics, and other fields involving geometry, thermodynamics, and fluid mechanics frequently use physical models.

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When we have to determine the oxidation number of compounds, we need to look at their specific and most common charges in their non neutral form, and Oxygen is an element that will usually present a -2 oxidation number and charge, the same way Hydrogen will almost always present a charge of +1, these fixed values for some elements is helpful for us to determine the oxidation number of other elements. For oxygen is -2, therefore letter D

Explanation:

We have to balance this equation:

___ H₂SO₄ + __ KOH ----> __ K₂SO₄ + __ H₂O

The first step is to determine the number of atoms of each element that we have on both sides of the equation.

___ H₂SO₄ + __ KOH ----> __ K₂SO₄ + __ H₂O

K: 1 K: 2

S: 1 S: 1

H: 3 H: 2

O: 5 O: 5

We have 1 atom of K on the left side of the equation and there are 2 atoms of K on the rigth side of the equation. To balance the number of K atoms we can change the coefficient for KOH and write a 2 there.

___ H₂SO₄ + 2 KOH ----> __ K₂SO₄ + __ H₂O

K: 2 K: 2

S: 1 S: 1

H: 4 H: 2

O: 6 O: 5

We balanced the K. The S atoms are already balanced. Let's focus on H. We have 4 atoms of H on the left and 2 atoms of H on the right side of the equation. We can change the coefficient for H₂O and write a 2 there to get 4 atoms of H on the right side.

___ H₂SO₄ + 2 KOH ----> __ K₂SO₄ + 2 H₂O

K: 2 K: 2

S: 1 S: 1

H: 4 H: 4

O: 6 O: 6

We balanced the H and we also changed the number of O atoms on the right side and also balanced them. The balanced equation is:

H₂SO₄ + 2 KOH ----> K₂SO₄ + 2 H₂O

Answer: H₂SO₄ + 2 KOH ----> K₂SO₄ + 2 H₂O

First, we write the reaction to solve this:

Al(NO₃)₃(aq) => Al³⁺(aq) + 3NO₃⁻(aq)

We need to calculate the concentration of the salt:

Molarity = moles of Al(NO₃)₃ / Volume of solution (L)

Molarity = 2.00 moles / 2.00 L = 1.00 mol/L

The salt is completely disociated, so the concentration of NO3- ion is:

Concentration NO3- = 3 x Concentration of the salt = 3 x 1.00 mol/L = 3.00 mol/L

Answer: 3.00 mol/L

ANSWER

Alpha particle...........> decreases the atomic number of an atom

Beta particles .............> increases the atomic number of the atom

Gamma particle ..........> does not change the atomic number of the atom

EXPLANATION

The three types of radioactive particles are;

1. Alpha particle

2. Beta particle

3. Gamma particle

Alpha particles has a positive charge with atomic number 2 and mass number 4

Any atom that gives off alpha particle, will have it atomic number drops by 2 and its mass number drops by 4

Hence, alpha particle decreases the atomic number of an atom

Beta particles; The atomic number of a beta particle changes, it can either be positive or negative

When an atom gives off a beta particle, the mass number number of the atom remains unchanged but the atomic number increases

Hence, beta particles increases the atomic number of the atom

Gamma particle is a neutral particle and it does not have any charge on it

When an atom gives off a gamma particle, the mass and atomic numbers of the atom remain unchanged

Hence, gamma particle does not change the atomic number of the atom

INFORMATION:

Knowing that all electrolytes are water soluble, we must determine which other common similarity is possessed by all electrolytes

STEP BY STEP EXPLANATION:

To determine it, we need to know that

Simply, an electrolyte is a substance that can conduct an electric current when melted or dissolved in water. If the physical or chemical process that generates the ions is essentially 100% efficient (all of the dissolved compound yields ions), then the substance is known as a strong electrolyte. If only a relatively small fraction of the dissolved substance undergoes the ion-producing process, it is called a weak electrolyte.

That means, all electrolytes can conduct electricity, and they can be identified as strong or weak by measuring the electrical conductance of an aqueous solution containing the substance.

Finally, another common similarity for electrolytes is that they can conduct electricity.

ANSWER:

Another common feature of all electrolytes, apart from being soluble in water, is that they can all conduct electricity, either to a large or small extent.

The process of electroplating is done as follows:

Ions of one metal are reduced onto a cathode made of a different

Electroplating is the process by which one metal is used to coat the surface of another metal.

Electroplating is done in order to improve the appearance of one metal and is also done in order to protect against corrosion.

The process of electroplating involves electrolysis.

The metal to be coated over the is used as the anode while the metal to be coated is used as the cathode.

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The percent yield of the reaction when 3.85g of Ammonia reacts with 5.78g of O2 to give out 0.750L of nitrogen is 27.43%

It is given that the mass of Ammonia is 3.85g and the mass of Oxygen is 5.78g. The yield of Nitrogen is 0.750L. To find the percent yield, we need to know the number of moles of ammonia and Oxygen.

No of moles of Oxygen =  5.78/31.99

No moles of Oxygen= 0.181 mol of O2.

No. of moles of Ammonia = 3.85/17.03

                                             = 0.226 mol of NH₃

It can be seen that 0.226 mol of NH₃ reacts with 3/4th of 0.226 mol of O₂ which is 0.1695 mol of O₂.

But the given moles of O₂ are more than that of the required value. Therefore, NH₃ is the limiting reactant and O₂ is the excess.

Therefore,

0.226 mol of NH3 x 2 mol of N₂/ 4 mol of NH3

= 0.113 mol of N₂

Experimentally it would be calculated as

n = PV/RT

n =  (1 x 0.750)/(0.0821x295)

n = 0.031 mol of N₂

Percent yield = Experimental yield/theoretical yield x 100

Percent yield= (0.031/0.113)x100

Percent yield= 27.43%

Therefore, the percent yield of N₂ is 27.43%

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When the CH₃OH molecules are surrounded by water molecules, there are solvent-solute interactions where the solvent water molecules interact with the OH group of the CH₃OH molecules resulting in the dissolution of the molecules in water.

Solvation refers to the interaction between solvent and solute molecules whereby the solvent molecules surround and interact with the polar groups of the solute molecules resulting in the dissolution of the solute in the solvent.

Solvent-solute interactions are common when polar or ionic substances are dissolved in water. For example, when, methanol, CH₃OH is dissolved in water.

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Answer:

k = 1.625 mol⁻¹ L s⁻¹

Explanation:

What is given?

rate = 6.5 x 10⁻⁶ mol L⁻¹s⁻¹,

[NOBr] = 2 x 10⁻³ mol L⁻¹.

Step-by-step solution:

We want to find the rate constant, k of the reaction based on the rate law:

so we just have to solve for 'k' and replace the given values:

The answer would be k = 1.625 mol⁻¹ L s⁻¹

Answer:

Explanation:

Here, we want to select the balance used to measure mass to a hundredth accuracy

The kind of balance used in this case is the centigram balance. The measure the mass of a substance to an accuracy of a hundredth which is 0.01g

Answer

Explanation

Given:

[H⁺] = 0.90 M

Ka HPO₄²⁻ = 4.5 x 10⁻¹³

The characteristics that would help a city to be able to make long term infrastructural plans is the growth rate. Option C

The term infrastructure has to do with the facilities that are put up in a city to aide life in a city. It is the process of development in a city that helps a city to be able to aide the inhabitants to live a comfortable life.

It is very important to see that there is a laid down plan for the development of a city or a place and this is  very essential to the development of the place and the better life of the people that live in the city.

Now, the infrastructural plans that are made in a city has to factor in the growth rate of the city and this have to be based on the projected growth rate.

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Answer:

C

Explanation:

the answe is naturally occurring

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