Balance the following chemical reactions:

1. Pb(NO₃)₂ → PbO + NO₂ + O₂

2. CH₄ + O₂ → CO₂ + H₂O

3. Cu + AgNO₃ → Cu(NO₃)₂ + Ag

4. MnO₂ + HCl → MnCl₂ + H₂O + Cl₂

5. Pb(NO₃)₂ + NaCl → PbCl₂ + NaNO₃




Write the chemical reaction and balance it.

1. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble

white substance is formed.

2. Copper sulphate on treatment with potassium iodide precipitates cuprous iodide(Cu₂l₂),

liberates iodine gas and also forms potassium sulphate.

Answer: The answer is a B) Compound

Explanation:A compound is when two things are mixed together and steel is made of iron and carbon mixed together.

Answer: To determine the mole ratio

Explanation:

A balanced chemical equation is needed ,because it helps to determine the mole ratio of acid and base.

The mole ratio ensures that the number of moles of H+ provided by the acid is equal to number of moles of OH- ion provided by the base, For neutralization to occur, this must be the case.

Answer:

Sand is still sand but if you were to change the feel of sand it would not be sand

Explanation:

Answer:

a metal

Explanation:

metals are good conductors of electricity.

Answer: Open System

Explanation: It's an open system because the "Cup" is literally exposed to the surroundings. It will lose heat or gain heat or any other type of energy in its surroundings.

To dilute the calcium sulfate solution, use the dilution formula to calculate the final volume, which is approximately 58.7mL.

To dilute the 1.72mM aqueous calcium sulfate solution to 1.00mM, we can use the dilution formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. Rearranging the formula, we have:

V2 = (C1V1) / C2

Plugging in the values: C1 = 1.72mM, V1 = 34.3mL, C2 = 1.00mM, we can calculate the final volume:

V2 = (1.72mM * 34.3mL) / 1.00mM = 58.732mL

Rounding to 3 significant digits, the final volume is approximately 58.7mL.

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Answer:

It has 4 significant figures

Explanation:

Notice the use of scientific notation to indicate that there are two zeros which should be significant. If this number were to be written without scientific notation (3,200,000,000) the significance of those two zeros would be lost and you would - wrongly - say that there were only two significant figures.

Answer:

0.1M

Explanation:

We'll begin by writing a balanced equation for the reaction between HCl and NaOH. This is illustrated below:

HCl + NaOH —> NaCl + H2O

From the above equation, we obtained:

nA (mole of the acid) = 1

nB (mole of the base) = 1

Data obtained from the question include:

Ma (Molarity of the acid ) = 0.12M

Va (volume of the acid) = 21.35cm3

Mb (Molarity of the base) =?

Vb (volume of the base) = 25.55cm3

Using the equation MaVa/MbVb = nA/nB, the molarity of the base can be obtained as follow:

MaVa/MbVb = nA/nB

0.12 x 21.35 / Mb x 25.55 = 1

Cross multiply to express in linear form.

Mb x 25.55 = 0.12 x 21.35

Divide both side by 25.55

Mb = (0.12 x 21.35)/25.55

Mb = 0.1M

Therefore, the molarity of the base (NaOH) is 0.1M

The molarity of the NaOH solution is calculated using the titration method. Given that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl, the molarity of NaOH was calculated to be 0.1 M.

In the standardization of NaOH solution, we use the concept of titration where a known concentration of an acid, in this case HCl, is used to find out the concentration of a base, which is NaOH here. During this process, the volume of the base that neutralizes a given amount of acid is measured. From the given data, we know that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl.

Given that, the stoichiometry of the reaction between HCl and NaOH is 1:1, the moles of HCl used can be calculated using the formula:

moles = Molarity * Volume (in litres)

Therefore, moles of HCl = 0.12 M * 21.35 cm3 / 1000 = 0.002562 mol

Since the reaction is 1:1, the moles of NaOH would be the same, i.e., 0.002562 mol.

The molarity of NaOH can then be calculated using the formula:

Molarity = Moles / Volume (in litres)

So, Molarity of NaOH = 0.002562 mol / 25.55 cm3 x 1000 = 0.1 M

Therefore, the molarity of the NaOH solution is 0.1 M.

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Answer: Option B) 127 °C

Explanation:

Initial volume of gas V1 = 5.00 L

Initial temperature of gas T1 = 100K

New volume of gas V2 = 20.0 L

new temperature of gas T2 = ?

Since volume and temperature are involved while pressure is constant, apply the formula for Charles law

V1/T1 = V2/T2

5.00 L/100K = 20.0 L/T2

cross multiply

5.00 x T2 = 100 x 20.0

5.00T2= 2000

T2 = 2000/5.00

T2 = 400K

Convert temperature in Kelvin to Celsius

(400K - 273) = 127°C

Thus, the new temperature of the gas is 127°C

Answer:

Heating.

Cooling.

Water Heater.

Washer and Dryer.

Lights.

Refrigerator.

Electric Oven.

Dishwasher.

Charging devices

Explanation:

People use electricity for lighting, heating, cooling, and refrigeration and for operating appliances, computers, electronics, machinery, and public transportation systems.

How it works is a current of electricity is a steady flow of electrons. When electrons move from one place to another, round a circuit, they carry electrical energy from place to place like marching ants carrying leaves. Instead of carrying leaves, electrons carry a tiny amount of electric charge

Hope this helped some!

Answer: microwave, TV, lamps, refrigerator, and last but not least a stove.

Answer:

It is because when a chocolate is crushed, it will be smaller pieces which exerts a larger surface area. So that it can easily take in heat to give out reaction.

Answer:

Calibrating the cabbage pH indicator means creating a color key based on solutions that have known pH values.

Explanation:

Answer: 1st a

2nd b, d

3rd a

Explanation:

Answer:3

Explanation:

The three moles of S are divided by the moles in your product in this case 1 (AlS)

3/1=3

Answer:

Disagree

Explanation:

Biodiversity is having a variety, or a diversity of life. Having one crop is not a variety, therefore this field does not have high biodiversity.

In the terms of biodiversity, a large field planted with only one type of crop does not display high biodiversity. This creates a monoculture, not diverse, and more prone to disease and pests due to lack of genetic diversity.

In the context of biodiversity, a large field with only one type of crop is not considered highly diverse. Biodiversity refers to the variety of life within an ecosystem, habitat, or a specific geographic area. It includes all the different types of genes, species, and ecosystems. A field with just one type of crop results in a monoculture, which is the opposite of biodiversity.

Monocultures are more susceptible to pests and diseases because there is a lack of genetic diversity. On the other hand, high biodiversity usually means more stability in an ecosystem, with increased resilience against environmental changes and disturbances.

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Final answer:

To find the ΔH for the combustion of propanol, the heat released is calculated with the calorimeter's heat capacity and temperature change, and then scaled to a per-mole basis.So,combustion of propanol to carbon dioxide gas and liquid water in kJ/mol was -2012.45 kJ/mol.

Explanation:

The question involves finding the ΔH (enthalpy change) for the combustion of propanol (C3H7OH). To calculate the enthalpy change of the reaction, we first need to calculate the heat released (q) during the combustion using the formula: q = C × ΔT, where C is the heat capacity of the calorimeter and ΔT is the change in temperature.

Using the provided data, the heat released by the combustion is:
q = 14.24 kJ/K × (302.15K - 298.00K)

This results in q = 59.288 kJ (rounded to three decimal places), which is the heat released when 1.760 grams of propanol are burned. To find ΔH per mole of propanol, we need the molar mass of propanol (C3H7OH), which is approximately 60.10 g/mol. Thus, we can calculate ΔH using the proportion:

ΔH (per mole) = q (per 1.760 g) × (60.10 g/mol / 1.760 g).

The final calculation yields ΔH as -2012.45 kJ/mol (rounded to two decimal places).

Answer:

transition elements

Explanation:

Metalloids are elements that have properties intermediate between those of metals and nonmetals. They are sometimes referred to as semi-metals. These materials have recently found great application in materials science and information technology.

Transition elements are however renowned for high densities and tensile strength. The transition elements have the highest density of all the element groups in the periodic table and also have resistance to corrosion. Transition metals such as gold silver and lead are coinage metals because they are resistant to corrosion.

Alkali and alkaline earth metals tarnish easily due to their high reactivity. They are usually very soft metals.

Answer:

Transition elements

Explanation:

Transition elements occupies the middle section of the periodic table. Generally, transition elements are metallic in nature. Examples of transition elements are scandium, titanium , vanadium, copper, cobalt, zinc , chromium, manganese , iron etc. Since transition elements are all metallic they are hard , lustrous , are good conductor of electricity and heat and have a high melting and boiling points .

Transition metals are also used as catalyst in many reactions. Transition metals have high densities compare to alkali and alkali earth metals. Transition element are less reactive compare to other metallic elements like the alkali and alkaline earth metals .

Transition metals are usually less reactive and they rarely react with oxygen in air . This resistance account for it noncorrosive nature. Example of this noncorrosive transition metals are silver, Titanium, chromium, manganese, copper etc .

Alkali and alkali earth metals are very reactive so they are likely corrosive. Metalloids don't have high densities and strength.    

Answer:

[tex]SiS_2[/tex]: Silicon disulfide

[tex]NBr_3[/tex]: Nitrogen tribromide

[tex]N_2Cl_4[/tex]: Dinitrogen tetrachloride

Explanation:

Whenever you have an binary compound such as this, you can look at the individual elements for the name. The first word will simply be the prefix + the name of the element.

*** Notice you don't need to put a prefix if theres only 1. This is understood as mono. Only on the first word.

For the second word, its simply the root + ide.

Answer:

Explanation:

The KM Theory is the 'micro' molecular description of the behavior of matter. That is, the theory takes into account particle-particle interactions. This is contrast with the 'macro' molecular description of matter that is based upon empirical relationships without taking into account particle - particle interactions.

For example, Charles Law defines the relationship of gas volume as a function of temperature as being direct. That is, an increase in temperature results in an increase in volume of gas. No mention is made of the fact that the increasing temperature is increasing the kinetic energy content of the particles causing an increase in velocity of the particles.

However, application of the principles of the KM Theory takes into account the relationship between kinetic energy and particle velocity in terms of increasing temperature and transfer of energy to specific quantities of matter. Such results are based upon probability concepts that 4 primary reaction factors must come together simultaneously to effect a chemical reaction. These are ...

1. reactive concentration of reactants => C

2. effective collisions occurring (orientation of particles on collisions) => E

3. the interaction of reactive structures by nature => N

4. temperature - energy conditions initiate reaction (activation energy point) => T

These are assumptions are 'reaction factors' (=> C.E.N.T for memory purposes) that must come together simultaneously to effect a reaction. The greatest probability of this occurring is at the temperature condition called the 'Activation Energy'. The relationship that defines this probability is called the Arrhenius Equation k = Ae^-ΔEₐ/RT where k is the kinetic rate constant, A is a proportionality constant, ΔEₐ the Activation Energy and T the Kelvin Temperature.          

Answer:

Yes indeed BRUVA!!!! Electrostatic is a term used to describe the charges of the ionic compound

Answer:

619.2 K

Explanation:

We can solve this problem by using Charle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant pressure, the volume of the gas is directly proportional to its absolute temperature"

Mathematically:

[tex]V\propto T[/tex]

where

V is the volume of the gas

T is the absolute temperature

The equation can be rewritten as follows for a gas that undergoes a transformation at constant pressure:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where in this problem:

[tex]V_1=736 mL = 0.736 L[/tex] is the initial volume of the gas

[tex]T_1=15.0C+273=288 K[/tex] is the initial temperature

[tex]V_2=2.28 L[/tex] is the final volume of the gas

Solving for T2, we find the final temperature:

[tex]T_2=\frac{V_2 T_1}{V_1}=\frac{(2.28)(288)}{0.736}=892.2 K[/tex]

Converting into Celsius degrees,

[tex]T_2=892.2-273=619.2 K[/tex]

Answer:

619

Explanation:

it takes of the 0.2 on CK12

Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.

Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.

For the given chemical equation:

[tex]3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ[/tex]

In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.

For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.

Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

Answer:

1)1.61molKg-1

Explanation:

we find the molality using the formula mole of solute/Kg of solvent..

Answer:

disulfur hexabromide

Explanation:

First, identify the element names using your periodic table.

"S" means sulfur. "Br" means bromine. The second element drops the ending and adds "-ide".

S₂Br₆

sulfur bromide

Decide if the compound is ionic or covalent.

Since there are two non-metals, this is a covalent compound. So, will use Greek prefixes for the number of atoms. You can see the list below and find "2" and "6".

S₂Br₆

disulfur hexabromide

List of Greek number prefixes:

1 mono

2 di

3 tri

4 tetra

5 penta

6 hexa

7 hepta

8 octa

9 nona

10 deca

The name of S₂Br₆ is disulfur hexabromide.

The unit of measurement for energy is Joule (J) (3rd Option)

Energy is simply defined as the ability to work.

The system of international (SI) unit for the measurement of energy is Joule (J). Other unit of measurement is kilojoule (KJ), megajoule (MJ) etc

There are various forms of energy. This includes:

All forms of energy are measured in Joule (J)

Learn more about energy:

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Answer:

joules

Explanation:

quiz on edg. 2022

Answer:

Oxybenzone contains ether, phenol and ketone (-CO) functional group alonq with two aromatic rings.

Explanation:

Answer: apply to almost every part of your body especially like

Explanation: the ears , scalp, back of the neck , and top of the feet , and back of heels.

Answer:

D. 20.6g

Explanation:

Molarity is defined as ratio between moles of solute (sodium bromide, NaBr) per liter of water.

As density of water is 1g/mL; volume of 400.0g of water is 400.0mL = 0.4000L.

That means 0.400L of 0.500M solution contains:

0.400L × (0.500mol / 1L) = 0.200moles of sodium bromide.

In mass (NaBr = 102.9g/mol):

0.200mol NaBr × (102.9g/mol) = 20.6g of NaBr

Right answer is:

D. 20.6g

During the June solstice, the Northern Hemisphere is tilted towards the Sun resulting in longer days; vice versa for the December solstice when the Southern Hemisphere experiences summer.

During the June solstice, which occurs around June 21, the Earth's Northern Hemisphere is tilted toward the Sun.

Conversely, during the December solstice, around December 21, the Northern Hemisphere tilts away from the Sun, causing shorter days and longer nights.

June Solstice: Northern Hemisphere tilted towards the Sun, maximum sunlight at the Tropic of Cancer.

December Solstice: Northern Hemisphere tilted away from the Sun, maximum sunlight at the Tropic of Capricorn.