A reaction occurs between a piece of lithium metal and magnesium sulfate. What type of reaction is this?

It requires 7458 calories of heat to raise the temperature of 225 grams of water from 10.5°C to 43.7°C.

To calculate the amount of heat required to raise the temperature of a substance, we can use the formula Q = m * C * ΔT, where Q represents the heat, m is the mass of the substance, C is the specific heat capacity, and ΔT is the change in temperature.

In this case, we have 225 grams of water, a specific heat capacity of 1.00 cal/g°C, and a temperature change of 33.2°C (from 10.5°C to 43.7°C).

Plugging these values into the formula:

Q = 225 g * 1.00 cal/g°C * 33.2°C

Q = 7458 cal

Therefore, it requires 7458 calories of heat to raise the temperature of 225 grams of water from 10.5°C to 43.7°C.

This calculation is based on the specific heat capacity of water, which is the amount of heat energy required to raise the temperature of water by 1°C per gram. The specific heat capacity of water is relatively high compared to other substances, which is why it takes a significant amount of heat to raise its temperature.

It's important to note that the specific heat capacity of water can vary slightly with temperature, but for practical purposes, we often assume a constant value of 1.00 cal/g°C.

By using the given values and the formula for heat, we can accurately determine the amount of heat required for this specific temperature change in the given mass of water.

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The correct equations for the breakdown of solid ammonium nitrite to nitrogen gas and liquid water under the law of conservation of mass would be 1 mol of solid ammonium nitrite to 1 mol of nitrogen gas and 1 mol of liquid water.

Since matter cannot be generated or destroyed, according to the rule of conservation of mass, the total mass of the reactants and products in a chemical process must remain constant. The balanced chemical equation for the breakdown of solid ammonium nitrite is:

NH4NO2(s) N2(g) + H2O (l)

The coefficients in this equation stand for the ratio of moles of each reactant and product. According to the factors 1, 1, and 1, 1 mol of nitrogen gas and 1 mol of liquid water are created for every 1 mol of solid ammonium nitrite that is broken down. As required by the rule of conservation of mass, this indicates that the combined mass of the reactants and products remains constant.

Ammonium nitrite ,\($\mathrm{NH} 4 \mathrm{NO}$\), will decompose to yield nitrogen gas and water Vapor by the following equation:

\(\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g})+\mathrm{N}_2(g)\)

What is a decomposition reaction?

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

Ammonium nitrite, \($\mathrm{NH} 4 \mathrm{NO} 2$\), will decompose to yield nitrogen gas and water Vapor by the following equation:

\(\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(g)+\mathrm{N}_2(g)$$\)

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The category of wastes that are not subject to regulation as RCRA hazardous wastes is option b, secure chemical landfill.

Radioactive and brake fern wastes are hazardous wastes that are subject to regulation under RCRA. However, secure chemical landfills are designed to safely manage and dispose of hazardous wastes, so they are exempt from RCRA regulations as long as they meet certain criteria.

These criteria include using a liner system to prevent leakage, installing a leachate collection system, and monitoring groundwater for contamination. It is important to note that even though secure chemical landfills are exempt from RCRA regulation, they are still subject to other federal and state regulations to ensure they are operating safely and minimizing environmental impacts.

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Answer:

3.0x10¹⁹ atoms

Explanation:

First we convert 10 mg of mercury into grams:

Then we convert 0.01 g of mercury into moles, using its molar mass:

Then we convert moles into number of atoms, using Avogadro's number:

Answer:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 0.969M

Explanation:

Based on the reaction:

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

Keq is defined as:

Keq = 1.0x10⁻³ = [PCl₃] [Cl₂] / [PCl₅]

Where [] are equilibrium concentrations of each species

Inital [PCl₅] = 2.0mol / 2.0L = 1M.

In equilibrium:

[PCl₃] = X

[Cl₂] = X

[PCl₅] = 1M-X

Where X is reaction coordinate

Solving for X in Keq:

1.0x10⁻³ = [X] [X] / [1-X]

1.0x10⁻³ - 1.0x10⁻³X = X²

1.0x10⁻³ - 1.0x10⁻³X - X² = 0

X:

X = -0.032M. False solution, there is no negative concentration

X = 0.031M

That means equlibrium concentrations are:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 1-0.031M = 0.969M

Answer:

there is no question

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Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Stability is the reason that causes atoms  to bond together to form molecules.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. In the nucleus, proton and neutron are present.

Every atoms want to gain stability. To gain stability atoms have to gain noble gas configuration that is outermost shell must contain 2,8, 18 electrons. The atom should follow octet rule. Stability lowers the energy of an atom.

Therefore stability is the reason that causes atoms  to bond together to form molecules.

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True statement for a nuclear reactions is that it changes the identity of the element.

Nuclear reactions are those reactions in which changes in the nucleus of atoms take place in the form of fission and fussion.

Hence identity of element changes.

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The ground pressure on that condition will be 1.4 Atm. The condition of that space is isotherms, to solve it we use Boyle's law in isotherms condition.

To solve this problem we are using Boyle's law. As Boyle's law state that " a gas's pressure and volume are inversely proportional" which is formulated as  P1 x V1 = P2 x V2. As per data given: early volume(V1) = 735 mL; pressure(P2) = 0.8 atm; and volume(V2) = 1286 mL. The calculation will be:

P1 x V1 = P2 x V2

P1 x 735 = 0.8 x 1286

P x 735 = 1028.8

P = 1.4 Atm

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Answer:

1 Hydrogen H

2 Helium He

3 Lithium Li

4 Beryllium Be

5 Boron B

6 Carbon C

7 Nitrogen N

8 Oxygen O

9 Fluorine F

10 Neon Ne

11 Sodium Na

12 Magnesium Mg

13 Aluminium Al

14 Silicon Si

15 Phosphorus P

16 Sulfur S

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20. calcium Ca

Answer:

h - hydrogen (1)

he - helium (2)

li - lithium (3)

be - beryllium (4)

b - boron (5)

c - carbon (6)

n - nitrogen (7)

o - oxygen (8)

f - fluorine (9)

ne - neon (10)

na - sodium (11)

mg - magnesium (12)

al- aluminium (13)

si - silicon (14)

p - phosphorus (15)

s - sulfur (16)

cl - chlorine (17)

ar - argon (18)

k - potassium (19)

ca - calcium (20)

Xenon and potassium do not form a bond. Xenon is a noble gas, and as such, it is chemically unreactive and does not form chemical bonds with other elements under normal conditions. Potassium, on the other hand, is an alkali metal and forms ionic bonds with other elements.

Xenon and potassium are two different elements that do not form a chemical bond. Xenon is a noble gas and is chemically unreactive, meaning it does not form chemical bonds with other elements. Noble gases are characterized by their full valence shell of electrons, which makes them stable and resistant to chemical reactions. Potassium, on the other hand, is an alkali metal and is highly reactive, meaning it readily forms ionic bonds with other elements. Ionic bonds are formed between positive and negative ions and are held together by electrostatic forces. Since xenon and potassium do not form a bond, it would not be classified as a covalent or ionic bond. The concept of covalent and ionic bonds only applies to chemical bonds between atoms.

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The correct answer is B.

The temporary asymmetry of electron density. Dispersion forces, also known as London dispersion forces, are a type of intermolecular force that occurs due to temporary fluctuations in electron density within molecules or atoms. These fluctuations create temporary dipoles, which induce similar dipoles in neighboring molecules or atoms, resulting in attractive forces between them. This temporary asymmetry of electron density is the primary cause of dispersion forces.

Polar covalent bonds (answer choice A) are associated with dipole-dipole interactions, while the geometry of particular molecules (answer choice C) is more relevant to other types of intermolecular forces such as hydrogen bonding or dipole-dipole interactions. Therefore, the correct answer is B. the temporary asymmetry of electron density.

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Dispersion forces, also known as London dispersion forces, occur due to the temporary asymmetry of electron density. Therefore, the correct answer is B.

Dispersion forces are a type of intermolecular force that arises due to fluctuations in the electron distribution within a molecule. At any given moment, electrons may be more concentrated in one region of the molecule than another, creating a temporary dipole.

This dipole can induce a complementary dipole in a nearby molecule, leading to attractive forces between the two molecules.

Dispersion forces are present in all molecules, regardless of whether they contain polar covalent bonds or not, and are the only intermolecular force between nonpolar molecules.

However, the strength of the dispersion forces increases with increasing molecular size, as larger molecules have more electrons and can create larger temporary dipoles.

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The molar mass of the gas, given that 3.25 g of the gas occupied 2.56 L is 30.66g/mol

To obtain the molar mass of the gas, we shall first obtain the number of mole of the gas. This can be obtained as follow:

PV = nRT

0.95 × 2.56 = n × 0.0821 × 280

Divide both sides by (0.0821 × 280)

n = (0.95 × 2.56) / (0.0821 × 280)

n = 0.106 mole

Haven obtain the mole of the gas, we shall determine the molar mass of the gas as follow:

Molar mass = mass / mole

Molar mass of gas = 3.25 / 0.106

Molar mass of gas = 30.66g/mol

Thus, the molar mass of the gas is 30.66g/mol

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Answer:

Cu

Explanation:

because it is 39.814% of CuSO4

Answer:

C

Explanation:

Answer:

He should not turn off the fume hood.

Explanation:

According to this question, Hunter is in a laboratory where he is about to commence work. He starts by adhering to some laboratory safety rules including putting on his lab coat and goggles. However, he was bothered by the noise of the fume hood, which was close to his station. He then decided to switch/turn it off.

The "TURNING OFF OF THE FUME HOOD" is Hunter's error in this experimental set-up. This is because the fume hood is a laboratory safety device that helps prevent the inhalation of harmful gases by laboratory workers. The fume hood is a ventilated compartment which ventilates i.e. passes out, the chemicals stored there.

Every experiment involving chemicals should be performed in the fume hood in order to curb the escape of fumes from this reactions. Hence, TURNING THE FUME HOOD OFF means that one of the safety laboratory protocols has been defaulted.

Answer:

He should not turn off the fume hood.

Explanation:

Answer:

Explanation:

D. i had this on my science test!!!

Answer:

D

Explanation:

yup its D

Answer:

Is an absolute temperature scale with zero at absolute zero

Explanation:

water from rain and snow that travels to streams

Please help!

Water from a rain and snow that travels to streams are examples of run off. These natural processes are part of water cycle and balance the water content in the atmosphere and hydrosphere.

Water cycle is a geological phenomenon to balance the  water content in the atmosphere, hydrosphere and in the biosphere. The water bodies evaporate by the heat radiated by sun.

The air moisture can be restored to the land through the cooling of the vapor and pour as rain. This best illustrates the interaction between atmosphere and hydrosphere.

Rain, snow, sleet, or hail that reaches a surface stream without ever going below the soil's surface is referred to as surface runoff. It differs from direct runoff, which is runoff that directly reaches surface streams following rainfall or snowmelt. Hence option 4 is correct.

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Answer:

Flame test is one of the chemical tests that can be used to identify a metal or metaloid

in an ionic compound.

Explanation:

Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.

To carry out flame test in a laboratory the following instruments are required:

--> a wire loop

--> Bunsen burner

--> the chemical compound under observation

--> protective wears.

The procedure involves the following steps:

--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.

--> using a clean wire loop deep into a beaker containing hydrochloric acid.

--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.

--> deep the loop in the acid again and then use it to pick few grains of the metal.

--> place the wire loop in the side of the flame and observe the colour of the flame.

Result of flame tests of some metallic ion will show the following:

--> sodium ion will give yellow colour flame

--> potassium ion will give lilac colour flame

--> calcium ion will give orange-red colour flame

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

We have that, the skin has pigment that protects from the sun(Melanin) but excess exposure can still cause serious damage.

Generally, Sunlight exposures can be a double edge sword as it provides one of the essential vitamins needed by the body to thrive(vitamin D), anon the other hand it still holds Heat energy which exess exposure to can cause ones  burns and destruction

Therefore

We say that over heating by sunlight can damage lots of things from skin, set fires. The skin has pigment that protects from the sun(Melanin) but excess exposure can still cause serious damage.

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Answer:

...................

.

Answer:

electron affinity: this is the energy released when a gaseous atom gains an electron to form a gaseous negative ion. electron affinity increases across the period and down the group

Electronegativity: the electronegativity of an atom is a power of that atom in a molecule to attract electron. the electronegativity values are plotted against atomic number. the electronegativity of element increases across the period but decreases down the group

Answer:

nếu có 40g dung dịch NaOH 20% phairn dùng hết bao nhiêu gam dung dịch HCl 25% để trung hoà

Glass Because wood and other materials can be electrified through induction, but glass can't.

Is specific heat capacity C or Q?

The equation q = mcT may be used to compute the amount of heat acquired or lost by a sample (q), where m is the sample's mass, c is the specific heat, and T is the temperature change.

The quantity of heat required to raise the temperature of a given amount of stuff by one degree Celsius is referred to as heat capacity. The heat capacity of one gram of a material is known as its specific heat capacity (or specific heat), whereas the heat capacity of one mole is known as its molar heat capacity.

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True. In general, solubility is determined by the balance of intermolecular forces (IMF) between the solute and the solvent molecules.

When the IMF( intermolecular forces) from the solute molecules are weaker in strength than the IMF from the solvent molecules, the solute particles will be more likely to dissolve in the solvent. This is because the weaker IMF of the solute particles can be more easily overcome by the stronger IMF of the solvent particles, allowing them to mix more easily. Mathematically, this can be expressed as:

Solubility =\(\frac{(IMF of Solvent - IMF of Solute) }{ Total IMF of Solution}\)

Solubility is the ability of a substance to dissolve in another substance. It is usually expressed as the maximum amount of solute that can dissolve in a given amount of solvent at a given temperature and pressure.

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