What would happen if a spoin is placed in a cup of water?

Answer:

T(final) = 40.4 °C

Explanation:

Given data:

Density of water = 1.00 g/mL

Volume of water at 25°C = 390.0 mL

Volume of water at 95°C = 110.0 mL

Final temperature of mixture = ?

Solution:

Heat absorbed by warm water = heat lost by hot water

q lost = -q lost ....... (1)

Formula:

q = m.c.ΔT

ΔT(warm) =  T(final) - 25°C

ΔT(hot) =  T(final) - 95°C

Mass of water:

d = m/v

1 g/mL = m/ 390 mL

390 g = m

For hot water:

d = m/v

1 g/mL = m/ 110.0 mL

110.0 g = m

Now we will put the values in equation 1.

390 g. c.   (T(final) - 25°C) =  - 110.0 g .c. (T(final) - 95°C)

390 T(final) - 9750 °C = -110 T(final) + 10450 °C

390 T(final) +110 T(final) = 10450 °C +9750 °C

500 T(final) = 20200

T(final) = 20200/500

T(final) = 40.4 °C

Answer:

2 9/13

Explanation:

First cancel the minus

then convert the Mixed fractions to improper fractions, you have

35/6 divided by 13/6

it becomes 35/6 x 13/6

when you cancel out, you’ll be left with 35/13 which Is 2 9/13

Bacterial contamination can occur within seconds to minutes, depending on various factors such as the type of bacteria and the environment. The most accurate option among the given choices is 5-10 minutes.

Bacterial contamination can occur very quickly, often within a matter of seconds or minutes. The actual speed of contamination depends on various factors such as the type of bacteria, the environment, and the presence of favorable conditions for bacterial growth. For example, if a person touches a contaminated surface and then touches their mouth or eyes, the bacteria can be introduced to their body almost immediately. Similarly, food left at room temperature for a few minutes can provide enough time for bacteria to multiply and contaminate the food.

Therefore, among the given options, the most accurate answer would be 5-10 minutes as a broad estimate of how quickly bacterial contamination can occur in certain situations.

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The correct answer is c. 10-20 seconds. bacterial contamination can occur in 10-20 seconds.

Bacterial contamination can occur very quickly, especially when proper food handling and hygiene practices are not followed. Cross-contamination between raw and cooked foods, or foods that will not be cooked, such as salads, can happen in a matter of seconds if they come into contact with contaminated surfaces, utensils, or hands. The time frame of 10-20 seconds is consistent with the rapid nature of bacterial transfer.  

To prevent such contamination, it is crucial to maintain cleanliness in food preparation areas, wash hands thoroughly before handling food, and keep raw and cooked foods separate. The other options, 5-10 seconds, 5-10 minutes, and 10-20 minutes, do not accurately represent the speed at which bacterial contamination can occur, with the fastest being within seconds under the right conditions.

Answer:i believe its water, vinegar, and iodine solution... sorry if wrong

Explanation:

The cornstarch and water mixture acts like a solid sometimes and a liquid at other times. This concoction is an example of a suspension (a mixture of two substances), one of which is finely divided and dispersed in the other. ... When you slap the cornstarch quicksand, you force the long starch molecules closer together.

Explanation of how Wyatt solved the equation x + 1/2(6x - 4) = 6 and verified the solutions.

Wyatt solved the equation x + 1/2(6x - 4) = 6 by simplifying and solving for x, resulting in x = 3, x = -7. To verify the solutions, each value was substituted back into the original equation to ensure they satisfy the equation, leading to an identity.

Answer:

Explanation:

For the reaction: 2X + 3Y = 3Z, the combination of 2.00 moles of X with 2.00

moles of Y produces 1.75 moles of Z

      2 mol       2 mol   1.75 mol

       2X     +    3Y       =    3Z

need 2 mol  3 mol     to give 3 mol

3 mol Z/3 mol Y=  1 to 1

should get 2 mol Z

1.75/2 =87.5 % yield

87.5 % per cent yield of this reaction when the combination of 2.00 moles of X with 2.0 moles of Y produces 1.75 moles of Z

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

For the reaction: 2X + 3Y = 3Z, the combination of 2.00 moles of X with 2.00 moles of Y produce 1.75 moles of Z.

2 mol    +    2 mol   =  1.75 mol

2X     +    3Y       =    3Z

Need 2 mol  3 mol  to give 3 mol

3 mol Z ÷3 mol Y=  1 ÷ 1

should get 2 mol Z

The per cent yield of this reaction:

1.75 ÷ 2 = 87.5 % yield

Hence, 87.5 % per cent yield of this reaction.

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Answer:

Mg + AgNO₃ → Ag + Mg(NO₃)₂

Explanation:

A single replacement reaction is one in which an element gets replaced by another in a compound.

In the reaction

Mg + AgC→ Ag + Mg(NO₃)₂

Ag in AgNO₃ is replaced by Mg to give Mg(NO₃)₂.Only one element is getting replaced and hence it is a single replacement reaction.

Answer:

14 grammes

Explanation:

if atomic weight of Nitrogen = 14 g/mole

mole =mass(g) / atomic weight(g/mole)

mass = 1moles x 14(g/mole)

mass = 14 grammes of Nitrogen

Answer:

28.0.

Explanation:

Hello,

In this case, it seen that 1 only nitrogen weights 14.0 g/mol, in such a way, for diatomic nitrogen which is the most stable form of pure nitrogen has two nitrogens thereby the mass of one mole of nitrogen gas is 28.0g/mol because the aforementioned 14.0g/mol is multiplied by 2 accounting the two nitrogens.

Best regards.

Answer:

The answer is: "the insect touching the trigger hairs"

Explanation:

I took the k-12 test and got a 100%!

Answer:

2.26 g

Explanation:

Data given:

mass of Sulfuric acid = 3.24 g

mass of Aluminum hydroxide = 0.945 g

Theoretical yield of Aluminum sulfate = ?

Solution:

First we look for the balance reaction

Reaction

       3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the limiting reactant on which the amount of aluminum sulfate depends

So,

         3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

          3 mol         2 mol

from above reaction it is clear that 3 mole of H₂SO₄ combine with 2 mole of Al(OH)₃

Convert moles to mass

• molar mass of Al(OH)₃

molar mass of Al(OH)₃ = 27 + 3(16 + 1)

molar mass of Al(OH)₃ = 27 + 45

molar mass of Al(OH)₃ =72 g/mol

• molar mass of H₂SO₄

molar mass of H₂SO₄ = 2(1) + 32 + 4(16)

molar mass of H₂SO₄ = 2 + 32 + 64

molar mass of H₂SO₄ = 98 g/mol

So,

        3H₂SO₄         +         2Al(OH)₃   ----------> Al₂(SO₄)₃ + 6H₂O

    3 mol (98 g/mol)     2 mol (72 g/mol)

         294 g                        144 g

So its clear from the reaction that 294 g of H₂SO₄ react with 144 g of Al(OH)₃

now if we look at the given amounts the amount Al(OH)₃ is less then the amount of H₂SO₄

So, for Al(OH)₃ if we calculate the needed amount of H₂SO₄

So apply unity formula

          294 g H₂SO₄ ≅ 144 g of Al(OH)₃

          X g H₂SO₄ ≅ 0.945 of Al(OH)₃

Do cross multiplication

         X g H₂SO₄ = 294 g x 0.945 g / 144 g

         X g of H₂SO₄ ≅ 1.93 g

So, 1.93 g of H₂SO₄ will react out of 3.24 grams, the remaining amount of it will be in excess.

So,

Al(OH)₃ will be consumed completely an it will be limiting reactant.

-----------

Now to Calculate for the theoretical yield

First we look for the balance reaction

Reaction

          3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the mole mole ration of Al(OH)₃ to the amount of aluminum sulfate produced

So,

              3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

                                 2 mol                     1 mole

from above reaction it is clear that 1 mole of Al₂(SO₄)₃ produce by 2 mole of Al(OH)₃

As we know that

2 mole of Al(OH)₃ = 144 g

So,

if 144 g of Al(OH)₃ gives 1 mole Al₂(SO₄)₃ then how many moles of Al₂(SO₄)₃ will be produces by 0.945 g Al(OH)₃

So apply unity formula

               144 g of Al(OH)₃ ≅ 1 mole of Al₂(SO₄)₃

               0.945 g of Al(OH)₃ ≅ X mole of Al₂(SO₄)₃

Do cross multiplication

             X mole of Al₂(SO₄)₃ = 0.945 g x 1 mole / 144 g

             X mole of Al₂(SO₄)₃ = 0.0066 moles

So,

0.945 g of Al(OH)₃ produce 0.0066 mole of Al₂(SO₄)₃

Now convert moles of Al₂(SO₄)₃ to mass

Formula used:

           mass in grams = no. of moles x molar mass . . . . . . (1)

• molar mass of Al₂(SO₄)₃

molar mass of Al₂(SO₄)₃ = 2(27) + 3(32 +4(16))

molar mass of Al₂(SO₄)₃ = 54 + 3 (32 +64)

molar mass of Al₂(SO₄)₃ = 54 + 3 (96)

molar mass of Al₂(SO₄)₃ = 54 + 288

molar mass of Al₂(SO₄)₃ =342 g/mol

Put values in equation 1

         mass in grams = 0.0066 g x 342 g/mol

         mass in grams = 2.26 g

So the theoretical yield of Aluminum sulfate (Al₂(SO₄)₃ ) is 2.26 g

Answer:

They help prevent flooding.

They filter excess nutrients, sediment, and even pollution from the water that flows through them.

They are a rich habitat for many plant and animal species.

Explanation:

Wetlands are a unique ecosystem that serves as a rich habitat for many plant and animal species. It is an area of soil that is covered by water. These can be found anywhere in the world. Many of the animals such as mammals, fish and birds need wetlands for their growth. It also provides an ecosystem capable for growing plants, crops and the like. Thus, they are a rich habitat for many plants and animals.

Wetlands also filter excess nutrients, sediment and even pollution from the water that flows through them. This allows the purification of surface water. The nutrients are taken up by plants and other microorganisms while the sediments settle at the bottom.

Wetlands help prevent flooding by absorbing much of the water during storms. Their function is similar to that of a sponge whereby they can hold as much water as possible. This is the reason why the government is aiming to preserve such distinct ecosystems.

Answer:

pattern

Explanation:

Answer:

The answer is a pattern, have a nice day!

Answer:D. The objects potential energy will be greater.

Explanation:

Potential energy is expressed in

PE = mgh

Where PE is the product of mass of the object, g which is acceleration to gravity and height.

PE and height is directly proportional which means that any changes in height will change the value of the PE. Increase in height means increase in PE.

Answer:

D.The object's potential energy will be greater.

Explanation:

the higher the object is the more potential energy it will have.

Answer: When carbon dioxide breaks down into carbon and oxygen, the number of atoms always remains the same.

Explanation: I know this is late but for other people that are trying to find the answer their it is, I hope this helps

The observation which demonstrates the mass conservation is option C. When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.

Conservation of mass is alike the conservation of energy. That is mass can neither be created nor be destroyed. Therefore, the total mass of a system remains constant always.

In a chemical reaction, the total mass in the reactant side is always equal to the total mass in the product side. Hence, no new atoms are created or already existing atoms do not destroy.

In the decomposition of water, the number of atoms in the product side is equal to that in the reactant side. Hence, the total mass of water broken is equal to the total mass of hydrogen and oxygen.

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Your question is incomplete. But your complete question is as follows;

According to the law of conservation of mass, mass is neither created nor destroyed in any ordinary chemical reaction. Which of the following is a demonstration of this law?

When hydrogen and oxygen combine to make water, oxygen atoms are converted to hydrogen atoms.

When sodium and chlorine combine to make salt, some of the sodium is always lost.

When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.

When iron reacts with oxygen to form rust, the mass of the iron atoms increases.

Answer:

temperature

Explanation:

because of different temperature point.

To react with 14.0 grams of octane, 48.9 grams of oxygen are required in the combustion of octane in gasoline.

To balance the chemical equation C8H18(g) + O2(g) → CO2(g) + H2O(g), you need to ensure that the number of atoms of each element is equal on both sides of the equation. The balanced equation is:

C8H18(g) + 12.5O2(g) → 8CO2(g) + 9H2O(g)

To determine the mass of oxygen required to react with 14.0 grams of octane, you need to use stoichiometry. From the balanced equation, you can see that the mole ratio between octane and oxygen is 1:12.5. First, convert the mass of octane to moles by dividing it by its molar mass. Then, use the mole ratio to find the moles of oxygen. Finally, multiply the moles of oxygen by its molar mass to find the mass of oxygen:

14.0g C8H18 ÷ 114.22g/mol C8H18 = 0.1223 mol C8H18

0.1223 mol C8H18 × 12.5 mol O2 ÷ 1 mol C8H18 = 1.5288 mol O2

1.5288 mol O2 × 31.998 g/mol O2 = 48.9 grams of oxygen

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Answer:

A. Heat is Released.

(Both physical and chemical changes can tamper with temperature, but to identify a CHEMICAL change - you'll notice a color change, heat being released, odor and/or bubbling.)

The only thing listed applicable is Heat is Released.

Explanation:

Answer:

B. A gas is formed  

Ik I'm late sorry

Explanation:

I did the test :P

Most of an atom's volume is in the nucleus

Answer:

electron

Explanation:

the outer volume of the atom (which means most of the atom) is occupied by electrons. It occupies the space of the atom by constantly whirling around in a kind of orbit around the nucleus.

hope that is ok I tried my best to remember.

Answer:

Energy can transfer (convert) from one form to other.

Explanation:

Law of Conservation of Energy : It states that energy can neither be created nor destroyed in a chemical reaction but can be converted from one from to another.

Potential Energy(P.E) : Energy possessed by the object due to its position and size.Near the ground it attains zero value or close to it.

Kinetic Energy(K.E) : The energy possessed by the object due to its speed .When the object is in motion it has kinetic energy

For example :

When a stone is placed (rest) at some height on the top of the building . It has only potential energy .The potential energy at this point is calculated by

P = mgh

Now , when the the stone is released. It falls to the ground . During its motion towards the ground , its speed increases but the distance of stone from the ground decreases .

Hence the Object in between the ground and building has both K.E and P.E

K.E + P.E = mgh + 1/2 mv^2

If the object reaches just near the ground. Its kinetic energy is maximum but potential energy is almost zero . So at this point ,

K.E = 1/2 mv^2

Hence the Same potential energy is converted into kinetic energy while reaching the ground .

The object itself has not created the energy in between the motion.Neither its energy goes to zero.

Answer: Number of protons inside the nucleus.

Explanation: The atomic number is indicated by the amount of positively charged particles in the nucleus of an atom and these positively charged subatomic particles are protons.

Answer:

              The answer is 167.29 °C

Explanation:

According to Gay-Lussac's Law: The temperature and Pressure of a given gas are directly proportional to each other at given volume and amount.

The formula is as:

                                                 P₁ / T₁  =  P₂ / T₂   -----(1)

In given case:

                       T₁  =  25 °C  =  298.15 K

                       T₂  =  Unknown

                       P₁  =  440 kPa

                       P₂  =  650 kPa

Solving equation 1 for T₂,

                                       T₂  =   P₂ × T₁ / P₁

Putting Values,

                                       T₂  =   650 kPa × 298.15 K / 440 kPa

                                       T₂  =   440.448 K

Or,

                                      T₂  =   167.29 °C                 ∴ °C = K - 273.15

Answer:

speeding up the rate of breathing

Explanation:

Answer:

speeding up the rate of breathing

Explanation:

Explanation:

Number of molecules can be calculated as ratio of given mass to molecular mass x Avogadro's number .

That is ;

Number of molecules = Given mass /molecular mass x Avogadro's number .

Number of molecules = given mass / molecular mass x 6.023 x 10²³

In the above asked question :

The moles of CH₂O = 0.0124 moles

The molecular mass = CH₂O

(atomic mass of C + +atomic mass of hydrogen + atomic mass of O

that is :

12 +1x 2+16=30

Now, substituting in formula, we get

number of molecules = 0.0124mole x Av. number '

Number of molecules = 0.0124 x 6.022 x 10²³

= 0.0746 x 10²³ molecules

Answer:

Density = 6.17 * 10^14 g/cm³

Explanation:

Given Parameters

Mass of the proton = 1.0073 amu

Diameter of the proton = 1.75 * 10^-15 m

Required:

Calculate the density of the proton.

Density is calculated using the following formula;

Density = mass / volume

Where mass should be in grams and volume should be in cm ³

Calculating mass of a proton in grams.

Mass = 1.0073 amu

First, we convert to kilogram

Mass = 1.0073 * 1.66054 * 10^-27 kg

Then we convert to grams

Mass = 1.0073 * 1.66054 * 10^-27 * 10³ g

Mass = 1.0073 * 1.66054 * 10^-24 g

Mass = 1.673 * 10^-24 g

Then we calculate the volume of the proton

Volume = 4/3πR³ where R = Radius

And R = ½d.

First calculate the radius in centimetres

R = ½ * 1.73 * 10^-15 m

R = 0.865 * 10^-15

Convert to centimetres

R = 0.865 * 10^-15 * 10² m

R = 0.865 * 10^-13 cm

So, Volume = 4/3 * 3.14 * (0.865 * 10^-13)³

Volume = 4.187 * (0.865 * 10^-13)³

V = 4.187 * 0.865³ * 10^-39

V = 2.71 * 10^-39cm³

So, density = Mass / Volume becomes

Density = 1.673 * 10^-24 g / 2.71 * 10^-39cm³

Density = 0.617 * 10^15 g/cm³

Density = 6.17 * 10^14 g/cm³

Answer:

carbon dioxide

Explanation:

Final answer:

Mars's atmosphere is mainly made up of carbon dioxide (95%) with small amounts of nitrogen (3%) and argon (2%). Its thin atmosphere resembles the conditions found high in Earth's atmosphere and is only 0.007 bar in surface pressure, which contributes to the planet's dry and dusty landscape.

Explanation:

The thin atmosphere of Mars is primarily composed of carbon dioxide (CO2), which makes up about 95% of its atmospheric content. In addition to CO2, the martian atmosphere contains roughly 3% nitrogen and 2% argon. Mars's air is so rarefied that it resembles the conditions found at an altitude of around 30 kilometers above Earth's surface. The planet's low atmospheric pressure prevents the existence of liquid water on its surface, as well as making winds less forceful despite their high speeds. Nevertheless, these winds are able to carry fine dust particles across the planet, creating the characteristic red hue that covers Mars's landscape and occasionally causing massive dust storms.

While Mars currently has a very thin atmosphere, it likely had a much thicker atmosphere in the past which could have supported liquid water and potentially conditions suitable for life. Any existing life on Mars today might be found in protected environments below the surface, where conditions could still support it.

Answer:

g silicon = 0.0243 g

Explanation:

∴ atoms silicon = 5.2 E20 atoms

⇒ n Silicon = (5.2 E20 atoms)×(mol/6.022 E23 atoms) = 8.635 E-4 mol silicon

∴ mm silicon = 28.086 g/mol

⇒ g silicon = (8.635 E-4 mol)×(28.086 g/mol) = 0.0243 g

8.3mL

Explanation:

Given parameters:

Mass of acetone = 6.54g

Density of acetone = 0.7857 g/mL

Unknown:

Volume of acetone = ?

Solution:

Density is defined as the mass per unit volume of a substance. It is expressed mathematically as shown below:

  Density = [tex]\frac{Mass}{Volume}[/tex]

Since the unknown is volume, we make it the subject of the formula

Volume =  [tex]\frac{mass}{density}[/tex]

Input the values;

  Volume = [tex]\frac{6.54}{0.7857}[/tex] = 8.3mL

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Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O

Explanation:

The equation is now balanced.

2 atoms H in both reactant and product side.

Cl have 2 atoms on both sides.

Ca have 1 atom in both sides.

C have 1 atom on both sides and

O have 3 atoms on both reactant and product side

Answer:

A. Loss of agricultural land

Explanation:

Urban development pretty much encourages the other three answers' development

Answer: it would A the loss of agriculture land