100 points guys please help me

Answer:

Metal is a conductor of heat so it transmits warmth away from Andrew's hand at a faster rate than plastic.

Explanation:

remember, cold air never existed. only the lack of heat :)

Answer:

2MnO2 (s)

Explanation:

3KCN(aq) + 2KMnO4(aq) + 1H2O(l) → 3KCNO(aq) + 2MnO2(s) + 2KOH(aq)

Reactants:

K: 5

C: 3

N: 3

Mn: 2

O: 9

H: 2

Products:

K: 5

C: 3

N: 3

Mn: 2

O: 9

H: 2

Final answer:

Gasoline has a higher energy density than electricity stored in lithium-ion batteries, enabling more energy to be carried per unit of weight. Gasoline vehicles can refuel quickly, offering convenience for long-distance travel, while electric vehicles require longer recharge times. Additionally, gasoline's safety profile is relatively high given its energy content, as it burns rather than explodes.

Explanation:

One of the main advantages that gasoline has over electricity for powering cars is its higher energy density. Gasoline contains approximately 13 kWh/kg, while the energy density of lithium-ion batteries is about 0.2 kWh/kg, which is substantially lower. This means that gasoline can deliver more energy per unit of weight than batteries can, making it a more energy-dense fuel source.

An additional advantage is the rapid refueling capability of gasoline vehicles. A car can fill its tank with gasoline at a rate of 15 MW, allowing it to be ready for further travel in a matter of minutes, whereas electric cars often require hours to fully recharge. This convenience factor is a significant benefit for long-distance travel or in situations where quick refueling is necessary.

Safety is another aspect where gasoline has an advantage. Although gasoline is flammable, it is not as explosive as one might think—the vapor mix with oxygen burns rather than explodes, making it relatively safe for an energy source with such high energy content.

Answer:

I just took it on use test prep. the answer is C. 2H + 2e → H2(g)

Answer:B

Explanation:USA test prep

Answer: 72 g of [tex]H_2O[/tex] is formed.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} O_2=\frac{64}{32}=2moles[/tex]

[tex]2H_2+O_2(g)\rightarrow 2H_2O[/tex]

As  [tex]H_2[/tex] is the excess reagent, [tex]O_2[/tex] is the limiting reagent as it limits the formation of product.

According to stoichiometry :

1 mole of [tex]O_2[/tex] produce=  2 moles of [tex]H_2O[/tex]

Thus 2 moles of [tex]O_2[/tex] will require=[tex]\frac{2}{1}\times 2=4moles[/tex]  of [tex]H_2O[/tex]

Mass of [tex]H_2O=moles\times {\text {Molar mass}}=4moles\times 18g/mol=72g[/tex]

Thus 72 g of [tex]H_2O[/tex] is formed.

The total number of moles of solute in 2230 mL of a 3.0 M NaOH solution is calculated by converting the volume to liters and multiplying by the molarity, resulting in 6.69 moles of NaOH.

The total number of moles of solute in 2230 mL of 3.0 M NaOH solution can be calculated by using the definition of molarity, which is the number of moles of solute per liter of solution. The following steps are used for the calculation:

First, convert 2230 mL to liters: 2230 mL
1000 mL/L = 2.23 L.

Next, multiply the volume by the molarity: 2.23 L × 3.0 M = 6.69 moles of NaOH.

Therefore, the correct answer is that there are 6.69 moles of NaOH in 2230 mL of a 3.0 M NaOH solution.

Answer:

just do the lab or what ever

Explanation:

because your just taking notes and taking data

Answer:

A.

Explanation:

the boiling point is 4172 F

Answer:

23.46

Explanation:

Answer:

Thermometer

Explanation:

Because a thermometer helps to measure temperatures

Answer:

calorimeter

Explanation:

hope this helps :)

Answer:

0.083L

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

Ca(NO3)2 + H2SO4 —> CaSO4 + 2HNO3

Next, we shall determine the number of mole of Ca(NO3)2 needed to produce 0.1 mole of CaSO4.

From the balanced equation above,

1 mole of Ca(NO3)2 reacted to produce 1 mole of CaSO4.

Therefore, 0.1 mole of Ca(NO3)2 will also react to produce 0.1 mole of CaSO4.

Finally, we can determine the volume of Ca(NO3)2 needed for the reaction as follow:

Mole of Ca(NO3)2 = 0.1 mole

Molarity of Ca(NO3)2 = 1.20M

Volume =?

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 0.1/1.2

Volume = 0.083L

Therefore, 0.083L of Ca(NO3)2 is needed for the reaction.

Answer:

true

Explanation:

its a guess

Disease causing bacteria need oxygen to survive is true.

Diseases are defined as a specific aberrant condition that adversely affects an organism's structure or function on the whole or in part but is not immediately caused by an external harm. The onset of chronic diseases may be delayed by eating healthfully, exercising regularly, and abstaining from cigarettes and excessive alcohol use, among other factors.

Bacteria are defined as the creatures without a proper nucleus and only a few organelles that are prokaryotic unicellular organisms. The bacteria in our bodies help our bodies digest food, help us access nutrients, and neutralize poisons. Three distinguishing characteristics of bacteria are: 1) their lack of membrane-bound organelles, 2) their unicellularity, and 3) their small size.

Thus, disease causing bacteria need oxygen to survive is true.

To learn more about disease, refer to the link below:

https://brainly.com/question/8611708

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Answer:

The rotational period of the moon is equal to one revolution around Earth.

I think  this is the answer am not that positive.

Explanation

Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.

Answer:

The rotational period of the moon is equal to one revolution around the earth

Explanation:

I took the test. Hopes this helps :)

The correct answer is 'Eukarya because the organisms are all eukaryotic' since the organisms mentioned have cells with nuclei. Bacteria and Archaea are both prokaryotic and do not contain organisms with eukaryotic cells.

The correct answer to the question is A) Eukarya because the organisms mentioned are all eukaryotic. This means that the cells of these organisms contain nuclei. The domain Eukarya includes diverse groups such as animals, plants, fungi, and protists. These kingdoms are distinguished by the presence of eukaryotic cells, which differentiate them from prokaryotic cells found in the other two domains, Bacteria and Archaea, both of which lack a nucleus. Bacteria and Archaea are known as prokaryotes and often consist of single-celled organisms. Eukarya, on the other hand, can consist of both unicellular and multicellular organisms. Therefore, Option B 'Eukarya because the organisms are all prokaryotic' is incorrect as eukaryotes have a nucleus. Option C 'Bacteria because some of the organisms are autotrophs' is not correct either since autotrophy is not exclusive to Bacteria and does not define domain classification on its own. Lastly, Option D 'Archaea because the organisms are all diverse bacteria' is incorrect because Archaea is a separate domain, and it encompasses organisms that are genetically distinct from bacteria and eukaryotes, despite their prokaryotic cell structure.

Answer:

a

Explanation:

Answer:

C

Explanation:

In the case of burning wood, stored potential energy in the wood is released due to heating by other excited atoms.

Final answer:

The burning of wood transforms chemical potential energy stored in the wood into heat energy, making option C the correct answer.

Explanation:

The correct energy transformation for the burning of a piece of wood is chemical potential energy to heat energy. This process is an example of a chemical reaction where the chemical energy stored in wood's molecules is released as heat and light energy when the wood combusts.

The chemical potential energy stored in the bonds of the wood is released as heat and light during the combustion process. This chemical potential energy is converted into heat energy, which is evident through the warmth generated by the burning wood. Additionally, some of this energy may also be transformed into light, but the primary conversion is from chemical potential energy to heat.

Answer:

Option "C" is the correct answer to the following question.

Explanation:

Given:

Pressure in an automobile tire (P) = 1.88 atm

Temperature (K) = 25°C = 273 + 25 = 298 Kelvin

New temperature (K1) = 37°C = 273 + 37 = 310 Kelvin

Find:

New pressure in an automobile tire (P1) = ?

Computation:

[tex]\frac{P}{K}= \frac{P1}{K1} \\\\\frac{1.88}{298}= \frac{P1}{310}\\\\1.9557[/tex]

New pressure in an automobile tire (P1) = 1.9557

New pressure in an automobile tire (P1) = 1.96 (Approx)

Answer:

C

Explanation:

The diagram which shows electrons violating the Pauli exclusion principle is: C. a box containing an up and a down arrow and 2 other up arrows.

The Pauli exclusion principle can be defined as a principle which states that no two electrons (fermions) in a single atom can have the same values for all four (4) of their electronic quantum numbers.

Furthermore, this principle states that the orbital of an atom can only contain a maximum of two electrons, and they must have opposing spin orientations.

In conclusion, the diagram which shows electrons violating the Pauli exclusion principle is a box containing an up and a down arrow and 2 other boxes with 2 up arrows, that are having the same spin orientations as shown.

Read more on Pauli exclusion principle here: https://brainly.com/question/10386902

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A base turns red litmus blue. Litmus paper is paper that has been treated with a specific indicator, a mixture of 10 to 15 natural dyes that turns red in response when the pH is acidic, and blue when it is basic.

Answer: The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

[tex]a=\frac{a_o}{2^n}[/tex]

where,

a = amount of reactant left after n-half lives = ?

[tex]a_o[/tex] = Initial amount of the reactant = 100 g

n = number of half lives =[tex]\frac{\text {given time}}{\text {half life}}=\frac{10}{5}=2[/tex]

Putting values in above equation, we get:

[tex]a=\frac{100g}{2^2}[/tex]

[tex]a=\frac{100g}{4}=25g[/tex]

Therefore, the amount of carbon-14 left after 10 years is 25 g

Answer:

last one

Explanation:

Answer:

2nd one

Explanation:

Answer:

(0.9868 atm)(0.89 L) = (x)(0.0821 L-atm)(294 K)

0.87825 = (x) 24.1374

x = 0.03638 moles :)

Explanation:

Given the value of the temperature and the pressure, the amount of the ideal gas contained in the given volume is 0.036mol.

The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.

It is expressed as;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )

Given the data in the question;

To determine the amount of  gas, we substitute our values into the expression above.

PV = nRT

n = PV / RT

n = ( 0.986842atm × 0.89L ) / ( 0.08206 Latm/molK × 294.15K )

n = 0.87828938Latm / 24.137949Latm/mol

n = 0.036mol

Therefore, given the value of the temperature and the pressure, the amount of the ideal gas contained in the given volume is 0.036mol.

Learn more about Ideal Gas Law here: brainly.com/question/4147359

Answer:

The correct answer is C. Air pressure. :)

Explanation:

Air preasure is the amount of gravitational force acting against an object.

Answer:

Explanation:

According to Boyle's Law, at constant temperature, pressure and volume have inverse relation that is as pressure would increase, volume would decrease.

According to Charles Law, at constant pressure, the volume is directly proportional to temperature.

According to the given graph and diagram, the temperature is constant and volume and pressure have inverse relation.

Thus, option A is correct.

Answer:

The soda can kept the same mass as it changed in shape only

Explanation:

Law of Conservation states "mass cannot be created or destroyed" therefore this is why the mass hasn't changed, but when it was smashed the shape changed.

Final answer:

The soda can's mass remains the same after being stomped and flattened, as no matter is added or removed during this physical change, which is explained by the Law of Conservation of Mass.

Explanation:

The statement that best describes the change made in the soda can after Carlos stomps on it is that the soda can kept the same mass as it changed in shape only. This is explained by the Law of Conservation of Mass, which states that the mass of a closed system of substances will remain constant, regardless of the processes acting inside the system. Therefore, even though Carlos changed the can's shape by stomping on it, he did not add or remove matter from the can, so its mass remained unchanged. This principle is crucial in chemistry and holds true for both physical changes, like changing the shape of a can, and chemical changes, where substances may change form but the total mass remains constant.

Answer:

c . Desert

Explanation:

desert biome is character as a drive with temperature ranging from Hot cold and little plant life .

Answer:

desert

Explanation:

the desert does not have a diverse community with animals, is very dry with little precipitation, and is usually incredibly hot but has a cold/warm temperature at night in the winter.