Mixing vinegar and with baking soda produces carbon dioxide and water. Is this a chemical change or a physical change?

A mixture of charcoal, sand, sugar, and water is a heterogeneous mixture. Sugar can easily dissolve in water. Slightly heating the mixture will ensure all of the sugar is dissolved in the water. The mixture then can be filtered to separate out sugar solution from sand and charcoal. The mixture of sand and charcoal is washed several times with water and filtered so that no traces of sugar solution remain in the mixture. To the mixture containing sand and charcoal, water is added. Charcoal being lighter floats on the surface of water, whereas sand being heavy sinks to the bottom. The charcoal floating can be removed manually. After all the charcoal is removed, the mixture of sand and water is again filtered and the sand collected on filter paper is dried. Therefore, by using the above process sand can be separated out from a mixture of charcoal, sand, sugar, and water.

The process of separating sand from a mixture of charcoal, sand, sugar, and water involves sedimentation, decantation, filtration, and evaporation. Sedimentation and decantation help in separating sand and charcoal from sugar and water, filtration further separates sand and charcoal, and the remaining sugar and water can be separated through evaporation.

To separate sand from a mixture of charcoal, sand, sugar, and water, you can apply the process of filtration, sedimentation, and evaporation. First, sedimentation and decantation could be used to separate the sand and charcoal from the sugar and water. Given that sand and charcoal are insoluble, they will settle at the bottom of the container after some time, which can then be separated by gently pouring out the water and sugar solution. Then, you could proceed to use filtration to separate the charcoal and the sand. Due to their differences in size, the sand will be caught in the filter, while the charcoal will pass through. Lastly, the evaporation method can be used to separate the sugar from the water. When the mixture is heated, the water will evaporate, leaving the sugar behind.

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Answer : The correct formula of the compound is, [tex]N_2O_5[/tex]

Explanation :

Dinitrogen pentoxide  is a covalent compound in which both the elements nitrogen and oxygen are non-metals.

The formula of covalent compound is given by:

So, the formula of given compound is, [tex]N_2O_5[/tex]

The answer is B. 6CO2+H2O yields C6H12O6+ 6H20.

Hi Khal75,

Experiment: How to seperate sand.

Answer - separated using a filter; not soluble in water

Sand is not soluble in water. If you heat it all the water will dissolve but the sand will not.

Answer:

B.6

Explanation:

Out of the 25 elements found in living things, 19 of them can be found in some organisms but not all.

There are 25 elements that living things on Earth need to survive. Out of all these 25 however, only 6 are needed by all living organisms universally. They include:

In conclusion, this means that 19 elements can be found in some living things but not all of them while 6 can be found in all of them.

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Answer : 135 grams of sodium has 5.869 moles.

Solution : Given,

Mass of sodium = 135 grams

Molar mass of sodium = 23 g/mole

Formula used :

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

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

[tex]\text{Moles of sodium}=\frac{135g}{23g/mole}=5.869moles[/tex]

Therefore, the moles of sodium present in 135 grams of sodium is, 5.869 moles.

According to ideal gas equation, there are 1.55 moles in the sample of gas.

To calculate the number of moles in a sample of gas, we can use the Ideal Gas Law equation: [tex]PV=nRT[/tex] where P is the pressure of the gas, V is its volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

We can rearrange the Ideal Gas Law equation to solve for n:

[tex]n=\dfrac{PV}{RT}[/tex]

Given:

V = 27.5 L

T = 302 K

P = 1.40 atm

We can use the gas constant, R, which is 0.0821 L·atm/mol·K.

Plugging in the values:

[tex]n=\dfrac{1.40}{0.0821}[/tex]×[tex]\dfrac{27.5}{302}[/tex]

=1.55 moles

Therefore, the number of moles in the sample of gas is 1.55 moles. Hence, option C is correct.

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Hello  Bobby792003

The best way to get rid of a marker stain on your skin is rubbing alcohol.

:)

A mixture is formed of two substances (molecules, elements, compounds, etc.) that are not chemically bonded. A compound is formed of two substances chemically joined together, so the answer is A.

Answer:

a. the substances in a compound are chemically joined in a fixed proportion.

Explanation:

A compound is defined as a pure substance that has more than one element. Compounds have a fixed composition. This means that a compound always has the same elements with equal percentages by mass. Meanwhile, a mixture is made up of two or more components that are mixed, but are not chemically combined.

Answer. C. The sample will mainly consist of granite.

Explanation:

Sample collected from was continental crust (a part crust) as the samples were from 60 km deep.  Continental crust ranges from 30 km to 70 km and this layer is mainly includes granite. This continental crusts is mainly responsible for formation of distinct land-forms like continents.

Statement A ,B and D informs us about the state and temperature of metals(iron) in core that is inner most  layer of the earth.

Answer: In a reversible reaction, the forward reaction takes place simultaneously the reverse reaction. Such a reaction, on reaching equilibrium, will have equal rate of going forward and going backward.

Explanation: It is a reaction in which the reactants reacts to give products and products reacts to give the reactants back simultaneously.

                     [tex]A+B\rightleftharpoons C+D[/tex]

In the above reaction reactants A and B reacts together to give products C and D, and vice versa.

In these reaction rate of reaction going forward is equal the rate of reaction going backward at the equilibrium.

In reversible reactions, the forward and backward reactions occur simultaneously, leading to a state of equilibrium. Changes to the system will shift this equilibrium in an effort to restore balance. The state of equilibrium can be quantitatively measured using an equilibrium constant, K.

In a reversible reaction, the forward reaction takes place simultaneously with the reverse reaction. At any time, these two processes occur at equal rates, leading to a state known as chemical equilibrium. This balance doesn't imply equal concentrations of the reactants and products but rather equilibrium in their reaction rates.

At equilibrium, changes in the system, such as introducing more reactants or removing products, will shift the equilibrium to re-establish the balance. For instance, if some product is removed, the system will favor the forward reaction to replace it, shifting the equilibrium right to restore equality in the reaction rates. This phenomenon is based on the principle of Le Chatelier.

Also noteworthy is that equilibrium constants, represented by K, are a quantitative measurement of a reaction's equilibrium state. They're defined through a mathematical function known as the reaction quotient, Q, which becomes the K constant when the system reaches equilibrium.

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The density of crystal is 2.65 g / mL

we know that

Density = Mass / Volume

So volume occupied = Mass / density

Mass of crystal = 4.46 g

So volume occupied by crystal = 4.46 / 2.65 = 1.68 mL

As the graduated cylinder contains water upto 25.0 mL

So if we immerse the crystal in that cylinder the water level will rise to 25+1.68 = 26.68mL

so the new read will be 26. 68 mL

To calculate the volume of the unknown crystal, subtract the initial volume of water from the final volume, assuming the crystal is insoluble. Use the formula: Volume of Crystal = Final Volume - Initial Volume (water). Substitute the given values to find the volume of the crystal.

The volume of the unknown crystal can be calculated using the given density and the mass of the sample added to the graduated cylinder.

First, we need to calculate the volume of water in the graduated cylinder by subtracting the initial volume (25.0 ml) from the final volume. Assuming the unknown crystal is insoluble in water, the total volume will be the sum of the water volume and the volume of the crystal.

The final volume can be calculated using the formula:

Final Volume = Initial Volume (water) + Volume of Crystal

By rearranging the formula, we can solve for the volume of the crystal

Volume of Crystal = Final Volume - Initial Volume (water)

Substituting the given values, the volume of the crystal can be calculated.

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1) The answer is: C.  heterogeneous mixture.

Heterogeneous mixture is not uniform in composition.

This substance is not element or compound, because different components could be observed in the substance.  

Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

For example, aluminium is an element and ammonia is compound.

This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.  

2) The answer is: A. It represents the beliefs of most scientists.

Consensus is general agreement, but not necessarily unanimity.

Consensus is achieved through communication at conferences, the publication process, replication and peer review.

For example, 97 percente of scienties agree that climate warming trends over the past century are extremely likely due to human activities.

The first ionization energy decreases from top to bottom within a group, as valence electrons are further away from the nucleus and more shielded by inner electrons. The correct statement is: The first ionization energy decreases from top to bottom within a group.

The first ionization energy typically follows a clear pattern within a group on the periodic table. According to the periodic trend in ionization energy, the first ionization energy decreases from top to bottom within a group.

This decrease occurs because, as you move down a group, valence electrons are further away from the nucleus and thus experience less pull. This reduced attraction makes it easier to remove an electron, resulting in lower ionization energies.

For instance, this can be seen in Group 1 alkali metals, where the outermost electron experiences lower effective nuclear charge due to increased electron shielding from inner filled shells.

Final answer:

In Peter's experiment, the independent variable is the temperature of the water, and the dependent variable is the amount of salt that dissolves. The independent variable is what the experimenter changes, and the dependent variable is what is measured in response.

Explanation:

Understanding Variables in an Experiment

In Peter's experiment to determine how much salt will dissolve in water as the temperature is increased, the independent variable is the temperature of the water, which Peter is controlling or changing. The dependent variable is the amount of salt that dissolves in the water, which will change in response to the temperature alterations. It's important not to confuse the independent and dependent variables as one is the cause (independent) and the other is the effect (dependent).

Example from Another Experiment

In the provided example where a scientist is observing bacteria growth on different gels, the independent variable would be the type of gel (A or B) since this is what the scientist has changed. The dependent variable would be the amount of bacteria growth observed after 24 hours, as this is the outcome that depends on the type of gel used.

Given data:

1 kilogram = 1,000 grams

how many kilograms is 1,216 grams?

Solution:

1000 grams = 1 kilogram

1 gram = 1/1000 kilograms

1216 grams = 1/1000 * 1216 = 1.216 kilograms.

                                                    Hence 1216 grams =  1.216 kilograms.

The formula of pentaphosphorus tetraoxide is P₅O₄

As per the convention of naming chemical compounds - the Prefix names are used for naming covalent compounds.

The prefix 'penta' means '5', so we use 5 as subscript for P.

The prefix 'tetra' means '4', so we use 4 as subscript for O.

Therefore the formula of pentaphosphorus tetraoxide is P₅O₄

From almost the creation of the first true maps of the Earth, people started seeing how continents would be able to fit together.  In particular, people noticed that South America fits almost exactly into Africa.

It is now known that most of the major continental masses can be fit together in a jigsaw process.   In fact we now know that the continents were indeed once all joined together as one land mass  the super continent of Pangaea.

If you look at most world maps you will ponder how this is evidence, as the continents really don’t appear to ‘fit’ together very well.

The molar concentration of the solution is 1.55 mol/L.

1. Convert grams to moles.

[tex]\text{Moles of NaOH} = 15.5 \text{g NaOH} \times \frac{\text{1 mol NaOH}}{\text{40.00 g NaOH}} = \text{0.3875 mol NaOH}\\[/tex]

2. Convert millilitres to litres

[tex]V = 250.0 \text{mL} \times \frac{\text{1 L}}{\text{1000 mL}} = \text{0.2500 L}\\[/tex]

3. Calculate the molar concentration (c)

[tex]c = \frac{\text{moles}}{\text{litres}} = \frac{\text{0.2875 mol}}{\text{0.2500 L}} = \textbf{1.55 mol/L}[/tex]

Molarity of solution is 1.5501

Given data:

Molarity of NaOH = ?

Volume of solution = 250 ml

Mass of solute = 15.5 grams

Solution:

Formula:

Molarity = Mass of solute/Molar mass of solute * 1/volume of solution in liters.

First convert volume into Liters = 250/1000 =0.25 L

Now put the values in formula:

Molarity of NaOH = 15.5/39.997 * 1/0.25

                              = 1.5501

                                         Molarity of NaOH      =  1.55011

Pressure of argon = 546.8 kPa

Conversion factor: 1 atm = 101.325 kPa

Pressure of argon = 546.8 kPa x 1 atm/101.325 kPa = 5.4 atm

Moles of argon = 15.82

Volume of argon = 75.0 L

According to Ideal gas law,

PV = nRT

where P is the pressure, V is the volume , n is the number of moles, R is the universal gas constant, and T is the temperature

T = PV/nR = (5.4 atm x 75.0 L) / (15.82 x 0.0821 L.atm.mol⁻¹K⁻¹)

T = 311.82 K

Hence the temperature of the canister is 311.82 K.

Answer:

311.82

Explanation:

Si, silicon. The oxide is SiO2, silicon dioxide. ...

Na, sodium. The oxide is Na2O. It is introduced as a white powder called soda ash.

Ca, calcium. The oxide is CaO. ...

Pb, lead. The oxide is PbO. ...

K, potassium.

The correct answer is option D, confirmation bias.

Confirmation bias is the tendency to interpret data in a way that confirms the already designed hypotheses.  

As the two scientists interpret the data (or experimental result) in different ways to adhere to the different hypotheses, this is indicative of cognitive bias. This is also called inductive reasoning where the premise is viewed as evidence for the validity of the conclusion.  

This is an example of confirmation bias.

The term confirmation bias in experiment refer to a situation in which the experimental leans more towards evidences that confirm his/her hypothesis rather than evidences that disprove it.

This type of bias creates a sort of self fulfilling prophecy. The conclusions of the research merely echoes his/her believes and contrary evidences are not given proper consideration.

If two scientists carry out the same experiment having different hypothesis and arrive at different conclusions from the same experimental results; then each of them merely confirmed his/her beliefs without considering the experimental results fairly.

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all of above ! they are involved in all thee mentioned here

The correct option is;

c. by observing and measuring

Scientists are like detectives. They investigate or look for answers using organized steps;

     They carried out investigations under controlled conditions to ensure the   accuracy of their experiment.

To solve this problem, we're going to have to use the equation: E=hv

This equation tells us that the energy of a particle of light (E), called a photon, is proportional to its frequency (v), by a constant factor (h). That constant (Planck's constant) we know to be 6.626 × 10^-34 J·s. So, we can plug in the frequency and Planck's constant to solve for the energy (E).

E=( 6.626 × 10^-34 J·s)(7.29 × 10^14 hz)

E= 4.830354 × 10^-19

Round to 3 significant figures, and you're done!

E= 4.83 × 10^-19

Answer:

[tex]4.83\times 10^{-19} J[/tex] is the energy of exactly one photon of this light.

Explanation:

Frequency of the blue shade light = [tex]\nu =7.29\times 10^{14} Hz[/tex]

Energy of the photon is given by Planck's equation = E

[tex]E=h\nu[/tex]

h = Planck's constant = [tex]6.634\times 10^{-34} Js[/tex]

[tex]E=6.634\times 10^{-34} Js\times 7.29\times 10^{14} s^{-1}[/tex]

[tex]E=4.83\times 10^{-19} J[/tex]

[tex]4.83\times 10^{-19} J[/tex] is the energy of exactly one photon of this light.