Which statement would indicate the presence of an acid?.

In a close system, the total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.

It is a system that is enclosed and would not allow the flow of any material form itself to another or form another system to itself.

A close system also does not allow transfer of energy between system.

Therefore, the total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.

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A cup of hot coffee initially at 95ºc cools to 80ºc in 5 min while sitting in a room of temperature 21ºc. using just newton’s law of cooling, determine when the temperature of the coffee will be a nice 50ºc

In 10 minutes the hot coffee will attain the temperature of 50 degrees Celsius.

Initially the hot cup of coffee at the temperature of 95 degrees Celsius but after 5 minutes its temperature decreases from 95 to 85 degrees Celsius which is 15 degrees Celsius decrease so in other 5 minutes, the temperature decreases to 65 degrees Celsius.

Again after 5 minutes the temperature will further decrease finally the cup of coffee attain the temperature of 50 degrees Celsius so we can conclude that in 10 minutes the hot coffee will gain the 50 degrees Celsius temperature.

According to Newton's Law of cooling, the charge of loss of heat from a body is immediately proportional to the difference in the temperature of the frame and its surroundings.

The price, wherein a frame that is uncovered, modifications the temperature thru radiation is about proportional to the difference among the item's temperature and its environment, and the furnished difference is low. that is called Newton's law of cooling.

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Answer:

4.95

Explanation:

1.00 M H2A

1.38 m NaOH

Titration = 200.0 mL

Calculate moles of NaOH

= \(\frac{100*1.38}{300}\)  = 0.46

calculate moles of H2A

= \(\frac{200 * 1.0}{300}\) = 0.667

therefore the moles of acid left = moles of H2A - moles of NaOH

                                                    = 0.667 - 0.46 = 0.207

pka = - log( ka )

       = - log ( 2.5 * 10^-5 ) = 4.61

calculate PH after 100 ml of 1.38 M NaOH have been added

PH = pka + log \((\frac{salt}{acid} )\)

     = 4.61 + log \((\frac{0.46}{0.207} )\) = 4.95

A chemical alteration has occurred. A new material, cottage cheese, with distinct qualities from the original milk and vinegar is produced when the acid in the vinegar and the proteins in the milk react.

The change described is a chemical change. When vinegar, which is an acid, is combined with milk, a reaction occurs between the acid and the proteins in the milk. This reaction causes the milk to sour and thickens, resulting in the formation of cottage cheese. This change cannot be easily reversed, and the resulting cottage cheese is a new substance with different properties than the original milk and vinegar. This is a chemical change because the molecules in the milk and vinegar are rearranged to form a new substance, which has different chemical and physical properties than the original substances. This process is different from a physical change, such as melting ice, which does not result in the formation of a new substance.

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To calculate the number of grams of phosphorus in 56.8 kg of sodium phosphate (Na3PO4), we need to first determine the percentage of phosphorus in Na3PO4:

The molar mass of Na3PO4 is:

Na = 22.99 g/mol (3 atoms)

P = 30.97 g/mol (1 atom)

O = 15.99 g/mol (4 atoms)

Total molar mass = 163.94 g/mol

The mass of phosphorus in 1 mole of Na3PO4 is:

30.97 g/mol

So, the percentage of phosphorus in Na3PO4 is:

(30.97 g/mol / 163.94 g/mol) x 100% = 18.89%

Therefore, in 56.8 kg of Na3PO4, the mass of phosphorus is:

56.8 kg x 18.89% = 10.73 kg

Converting 10.73 kg to grams:

10.73 kg x 1000 g/kg = 10,730 g

Therefore, there are 10,730 grams (or 10.73 kg) of phosphorus in 56.8 kg of sodium phosphate (Na3PO4).

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Answ

Matt4r is all around

Explanation:

Answer:

D. 4.20%

Explanation:

Given the following data:

Accepted value = 524 degrees

Experimental value = 546 degrees

To find the percentage error;

Percent error can be defined as a measure of the extent to which an experimental value differs from the theoretical value.

Mathematically, it is given by this expression;

\( Percent \; error = \frac {accepted \;value - experimental \; value}{ accepted \;value} *100\)

Substituting into the equation, we have;

\( Percent \; error = \frac {524 - 546}{ 524} *100\)

\( Percent \; error = \frac {22}{524} *100\)

Note: the negative sign is ignored when calculating percentage error.

\( Percent \; error = 0.04199 *100\)

Percent error = 4.199 ≈ 4.2%

Answer:

Option (A) the solid X is ground to a fine powder.

Explanation:

X(s) + 2B(aq) → X+(aq) + B2(g)

In the reaction above, the rate of the reaction will be highest, when X being a solid is ground to fine powder.

Grounding X to fine powder simply means increasing the surface area of X.

An increase in surface area of reactants will definitely increase the rate of reaction because the particles of the solid will collide with the right orientation and hence speed up the reaction rate.

Answer:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

The ionization energy decreases as the size increases. The electrons get added to the new shell and the nuclear charge increases. But the effect of addition of new sheels overcomes the increase of nuclear charge.The valence shell moves far from the nucleus.

Thus the valence electron gets less tightly held by the nucleus and thus less energy is required to remove the valence electron.

Shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus. Thus as the size increases and the electrons move away from nucleus, the attractive forces decrease.

Answer:

solid, rocky, dense

Explanation:

The three (3) words which best describe the composition of the inner planets are: B. rocky, solid, dense.

Based on astronomical information and records, there are two (2) main types of planet and these include the following:

An inner planet can be defined as a type of planet that is closest to the Sun and it's rocky, solid and dense in nature such as mercury, venus, earth and mars.

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Answer:

Filtration,Sedimentation and distillation

Explanation:

These 3 are physical processes which are commonly used in nature while in chemical processes,Chlorination is done to eliminate bacteria and other germs present

Happy 2 have helped in some way

Answer:

acid rain

Explanation:

When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation.

Answer:

Number of energy levels that the element has.

Explanation:

The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.

*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

Answer:

sorry we don't know the answer.

Answer:

When aluminum is added to cold dilute hydrochloric acid, there is no reaction because aluminum is a highly reactive metal, but it is protected by a thin oxide layer on its surface. This oxide layer is not easily dissolved by dilute hydrochloric acid, so the aluminum does not react with the acid. In order to react with the acid, a stronger acid such as sulfuric acid or nitric acid is needed to dissolve the oxide layer. Additionally, a higher concentration of hydrochloric acid is also needed to react with aluminum.

Another possible reason is that Aluminium metal react with hydrochloric acid to produce hydrogen gas and aluminum chloride salt, but the reaction is relatively slow and requires heat to speed it up. In cold dilute hydrochloric acid, the reaction rate is too slow to observe any visible change.

Answer:

There is a leyer of aluminium that prevents nothing from happening

Explanation:

Keep in mind that this reaction will not take place as soon as you add the piece of aluminium to the hydrochloric acid solution. That happens because the piece of aluminium is protected by a layer of aluminium oxide, Al2O3 , the same layer that protects aluminium from reacting with water

c.diamonds are the hardest

Answer:

The question did not contain any listed options. However, starch is a common white powder that will give a color change on reacting with iodine molecules

Explanation:

Iodine is a common indicator used in the lab to detect the presence of starch or starchy substances.

Iodine molecules react with amylose in starch to form a complex with a deep blue-black coloration.

Hence, a common white powder which reacts with iodine molecules to give a blue-black color must be a substance that contains starch.

The answer is:

d) cornstarch

Answer:

C.  Gas

Explanation:

A supercritical fluid occurs beyond the temperature of  critical point, wherein the state  matter transitions from liquid to gaseous phase interchangeably. Whereas, triple point occurs when all three states of matter: solid, liquid nd gas; coexist.

Hence the answer to the question is Gaseous phase/

I hope you found this helpful.

Answer:

asdd

Explanation:

adsade4223

Weighing by difference eliminates systematic balance errors because the mass is determined by the difference between two readings, a systematic error in the absolute mass on the balance will be removed by subtracting the final weight from the initial weight.

Option (d) is correct.

Weighing by difference involves weighing the sample container before and after adding or removing the sample. By subtracting the final weight from the initial weight, the mass of the sample can be determined. This method helps eliminate systematic balance errors because any systematic error in the absolute mass reading of the balance will affect both the initial and final weights equally.

Weighing by difference takes into account any potential errors in the balance's absolute mass reading, such as calibration or zero errors, and focuses on the change in mass instead. This approach improves the accuracy of the measurement and reduces the impact of systematic errors associated with the balance.

Therefore, the correct option is (d).

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Answer:

A

Explanation:

energy stored in chemical bonds of molecules

O the mechanism of a reaction is altered by the presence of a catalyst, while the overall reaction, in terms of reactants and products, remains unchanged.

The mechanism of a catalyzed reaction is different from that of an uncatalyzed reaction. A catalyst facilitates a reaction by providing an alternative reaction pathway with lower activation energy (AErxn). This alternative pathway allows the reaction to occur at a faster rate without being consumed in the process. Therefore, the mechanism of a catalyzed reaction involves the participation of the catalyst in forming temporary intermediate complexes with the reactants, followed by their regeneration. On the other hand, the overall reaction remains the same in both catalyzed and uncatalyzed reactions. The catalyst does not undergo any net chemical change and is not a reactant or product of the reaction. It merely accelerates the rate of the reaction by lowering the activation energy barrier. In summary, the mechanism of a reaction is altered by the presence of a catalyst, while the overall reaction, in terms of reactants and products, remains unchanged.

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In general, alcohols dissolve when mixed with water because the hydroxyl (-OH) groups in alcohols can form hydrogen bonds with water molecules.

Alcohols are organic compounds that contain a hydroxyl group (-OH) attached to a carbon atom. Water, on the other hand, is a polar molecule with oxygen being more electronegative than hydrogen, resulting in a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.

When alcohols are mixed with water, the hydroxyl group (-OH) in alcohols can form hydrogen bonds with the partial positive hydrogen atoms in water molecules. Hydrogen bonding is a strong intermolecular force that allows the alcohol molecules to interact with water molecules, leading to dissolution.

The formation of hydrogen bonds between alcohol and water molecules helps to overcome the intermolecular forces present within the alcohol itself, such as van der Waals forces or dipole-dipole interactions. As a result, alcohols dissolve in water and form homogeneous mixtures.

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Answer:

Read below

Explanation:

The effects of London dispersion forces are most obvious in systems that are very non-polar (e.g., that lack ionic bonds), such as hydrocarbons and highly symmetric molecules such as bromine (Br2, a liquid at room temperature), iodine (I2, a solid at room temperature).

This is how far away from the ammonia-dampened plug\(&x=51.7 \mathrm{~cm} f r 0 \mathrm{~m} \mathrm{NH}\)

Given,

molar mass of \($\mathrm{HCl}=36.5$\)

molar mass of \($\mathrm{NH}_3=17$\)

Now, Rate \($\propto \frac{1}{\sqrt{\text { molar mass }}}$$$\)

\(\frac{\text { Rate of } \mathrm{NH}_3}{\text { Rate of } \mathrm{HCl}} &=\sqrt{\frac{36.5}{17}}=\sqrt{\frac{\text { molar mass of } \mathrm{HCl}}{\text { molar mass of } \mathrm{NH}_3}} \\\)

\(&=\frac{6.04}{4.12}=\frac{1.47}{100}\)

We know,

\(\frac{\text { Distance }}{\text { rate }}=\text { time }\)

Let x = d distance travelled by\($\mathrm{NH}_3$\)

87 - x = distance travelled by \($\mathrm{HCl}$\)

\(&\frac{x}{1.47}=\frac{87-x}{1} \quad \text { (comparing both } \mathrm{NH}_3 \& \mathrm{HCl} \text { ) } \\\)

\(&x=1.47(87-x) \\\)

\(&2.47 x=127.89 \\\)

\(&x=51.7 \mathrm{~cm} f r 0 \mathrm{~m} \mathrm{NH}\) is

Hence, This is how far away from the ammonia-dampened plug\(&x=51.7 \mathrm{~cm} f r 0 \mathrm{~m} \mathrm{NH}\)

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False Polar molecules do contain polar bonds, but non-polar molecules do not contain polar bonds. A polar bond is a covalent bond in which electrons are shared unequally between two atoms, resulting in a partial positive charge on one atom and a partial negative charge on the other. A polar molecule is one in which the distribution of electrons is not symmetric, resulting in a dipole moment and an overall partial positive and partial negative charge.

On the other hand, non-polar molecules are those in which the electrons are shared equally between the atoms, resulting in a symmetrical distribution of electrons and no net dipole moment. Non-polar molecules can contain non-polar bonds, such as in the case of diatomic molecules like nitrogen (N2) or oxygen (O2), which have non-polar covalent bonds. However, they can also contain polar bonds if the polar bonds are arranged in a way that the net dipole moment cancels out, resulting in a non-polar molecule. An example of this is carbon dioxide (CO2), which has polar bonds but is a non-polar molecule due to its linear, symmetrical shape.

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A substance's hue varies over time: Chemical transformation (Over time, the material is changing into a different chemical.

How can you tell whether a change you witness is chemical or physical?

In a physical change, the substance's shape or appearance changes, but the type of matter it contains stays the same. In contrast, when matter undergoes a chemical transformation, at least one new substance with novel features is created.

Not every change in colour results from a chemical shift. If one were to alter a substance's colour through a non-chemical interaction, such as painting an automobile, the alteration would be physical rather than chemical. This is due to the fact that the car's makeup has not changed.

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