What’s the answer for this ?

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)

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Answer:

joules

Explanation:

quiz on edg. 2022

Answer:

a metal

Explanation:

metals are good conductors of electricity.

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 : The correct option is, (4) 6.0 mol

Explanation :

The given balanced chemical equation is,

[tex]3Pb^{2+}+2Cr\rightarrow 3Pb+2Cr^{3+}[/tex]

In this reaction, lead undergoes reduction and chromium undergoes oxidation.

Oxidation reaction : It is the reaction in which a substance looses its electrons. In this oxidation state increases.

Reduction reaction : It is the reaction in which a substance gains electrons. In this oxidation state decreases.

Half reactions of oxidation-reduction are :

Oxidation : [tex]2Cr\rightarrow 2Cr^{3+}+6e^-[/tex]

Reduction : [tex]3Pb^{2+}+6e^-\rightarrow 3Pb[/tex]

From the reduction reaction, we conclude that 6 moles of electrons gained by the 3 moles of lead ions.

Hence, the correct option is, (4) 6.0 mole

Answer:

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

Explanation:

3.75 litres is the volume of the balloon indoors at a temperature of 25°C.

Explanation:

Data given:

initial temperature of the gas in balloon  = -35°C or 238.15 K

initial volume = 3 litres

final temperature = 25 °C  or 298.15 K

final volume =?

pressure remains constant

From the data given when pressure is constant Charles' law is applied.

[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]

Rearranging the equation to know the final volume of the gas in balloon

V2 = [tex]\frac{V1T2}{T1}[/tex]

V2 = [tex]\frac{3 X 298.15}{238.15}[/tex]

V2 = 3.75 Litres

when the temperature of a gas is increased and pressure remains constant the volume of the gas increases.

The Volume of the balloon indoors in increased by 3.8 L.

Explanation:

As per the Charles law, at constant pressure the volume of the gas is in direct proportion with the temperature measured in Kelvin. As temperature increases, the volume expands that is increases and vice-versa.

[tex]$\frac{V1}{T1} = \frac{V2}{T2}[/tex]

T1 = -35° C + 273 K = 238 K

T2 = 25° C +  273 K = 298 K

V1 and T1 are the Volume and the temperature of the balloon inflated outdoors.

V2 and T2 are the Volume and the temperature of the balloon inflated indoors.

V2 can be found by rearranging the above equation as,

[tex]$V2 = \frac{V1 T2}{T1}\\[/tex]

[tex]$V2 = \frac{3 L \times 298 K}{238 K}[/tex]

    = 3.8 L

So the Volume of the balloon indoors in increased by 3.8 L.

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.

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:

D

Explanation:

As you move down anything, towards the earth, (gravitational) potential energy decreases. This eliminates options B and C.

By the law of conservation of energy, the energy of the system stays the same. However the energy may be converted into different forms. In this case, the potential energy is converted into kinetic energy - this is what makes people move faster as they go down the slope. This makes option A wrong and option D right.

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.

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:3

Explanation:

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

3/1=3

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.

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.

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

Answer:

100g like you answered it yourself

Explanation:

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. The total mass of reactant must be equal to total mass of product.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.

Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. Another postulated that was given by Antoine Lavoisier is the role of oxygen in combustion reaction.  total mass of reactant must be equal to total mass of product.

Therefore, the total mass of reactant must be equal to total mass of product.

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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.

When 6.2 moles of propane is burned in oxygen, it produces approximately 818.4 g of carbon dioxide.

Here, stoichiometry (a branch of Chemistry) is used to determine the product generated from a known quantity of reactants. The balanced equation for the combustion of propane is C3H8 + 5O2 → 3CO2 + 4H2O. This shows that 1 mole of propane (C3H8) produces 3 moles of carbon dioxide (CO2). So, it's a 1:3 ratio. Given that the molar mass of CO2 is approximately 44 g/mol, you can first find how many moles of CO2 are produced by multiplying the given moles of propane by 3 (6.2 × 3 = 18.6 moles CO2). Then, determine the mass by multiplying the moles of CO2 by the molar mass of CO2 (18.6 × 44 = 818.4 g). Thus, the combustion of 6.2 moles of propane yields 818.4 g of carbon dioxide.

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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:

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:

H + ions are attracted to the cathode , gain electrons and form hydrogen gas. OH - ions are attracted to the anode , lose electrons and form oxygen gas.

Answer :

(4) The mass of NaCl needed would be, 172.2 grams.

(5) The molality of toluene in the solution is, 10.9 mol/kg

Explanation :

Part 4:

[tex](K_b)[/tex] for water = [tex]0.5100^oC/m[/tex]

[tex]\Delta T_b=1.500^oC[/tex]

Mass of water (solvent) = 1001 g  = 1.001 kg

Molar mass of NaCl = 58.5 g/mole

Formula used :  

[tex]\Delta T_b=i\times K_b\times m\\\\\Delta T_b=i\times K_b\times\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}\times \text{Mass of water in Kg}}[/tex]

where,

[tex]\Delta T_b[/tex] = change in boiling point

i = Van't Hoff factor = 2  (for NaCl electrolyte)

[tex]K_b[/tex] = boiling point constant for water

m = molality

Now put all the given values in this formula, we get

[tex]1.500^oC=2\times (0.5100^oC/m)\times \frac{\text{Mass of NaCl}}{58.5g/mol\times 1.001kg}[/tex]

[tex]\text{Mass of NaCl}=172.2g[/tex]

Therefore, the mass of NaCl needed would be, 172.2 grams.

Part 5:

Formula used :

[tex]\text{Molality}=\frac{\text{Mass of toluene}\times 1000}{\text{Molar mass of toluene}\times \text{Mass of benzene (in g)}}[/tex]

Given:

Mass of toluene = 80.1 g

Mass of benzene = 80.0 g

Molar mass of toluene = 92.13 g/mol

[tex]\text{Molality}=\frac{80.1g\times 1000}{92.13g/mole\times 80.0g}=10.9mole/kg[/tex]

Therefore, the molality of toluene in the solution is, 10.9 mol/kg

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: 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:

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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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: 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:

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.