If the average speed of a water molecule at 25°c is 640 m/s, what is the average speed at 100°c?.

If the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.

Consider strategies to adjust each variable individually once you believe you have identified those that may be at play. If you alter more than one at once, you won't be able to identify the variable that is responsible for your observation. There are instances when factors are connected and act in concert to generate an event. Try to pick variables at beginning that you believe behave independently of one another.

The altitude of water is the independent variable, sometimes referred to as the manipulated variable.

The boiling point of water is the dependent variable (sometimes referred to as the responsive variable).

Therefore, if the independent variable is altitude of water and the dependent variable is boiling temperature. The experiment could be on how high does the water bubble and jump when boiling.

Learn more about  independent variable here:

https://brainly.com/question/1479694

#SPJ9

When the base sodium hydroxide dissolves in water, sodium and chloride ions are formed.

Any material that is slippery to the touch, tastes unpleasant, alters the colour of indicators (such as turning red litmus paper blue), combines with acids to generate salts, and facilitates certain chemical processes is considered a base in chemistry (base catalysis).

When the base sodium hydroxide dissolves in water, sodium and chloride ions are formed.

Since sodium hydroxide is an inert solid in itself, its ions do not impart any colour to the solution when it dissolves in water. So, a colourless solution is produced when sodium hydroxide is added to water.

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

nly.com/question/27228111

# SPJ1

200 sec or 3 min 20 msec

we need to get to class, 300 meters away,

so the distance becomes = 300 m

we can only walk in the hallways at about 1.5m/s

so the time become = 1.5m/s

time will it take to get to our class

time = distance/speed

time = 300/1.5

time = 200 sec or 3 min 20 msec

To know more about Distance visit :

https://brainly.com/question/15172156

#SPJ9

The example of Iodine and tellurium where iodine which had lesser atomic mass was placed before tellurium proved that order of the Periodic table based on atomic mass was not always correct.

The periodic table as designed by Mendeleev was arranged such that the elements were arranged in order of increasing atomic mass.

However, in this case of tellurium and iodine, Mendeleev placed tellurium before iodine even though it had a greater atomic mass than iodine. This was because Mendeleev observed that elements with similar chemical properties were occurring in a regular pattern in the periodic table and iodine has similar chemical properties to bromine and chlorine before it.

Therefore, the case of Iodine and tellurium proved that arranging elements in the periodic table in order of increasing atomic mass was not always correct.

Learn more about Mendeleev periodic table at: https://brainly.com/question/2165846

#SPJ1

Answer:

literally all you have to write to get the mark is the word isotopes

NO, a size separation technique does not make sense for separation of one soluble and one insoluble salt.

To separate one soluble and insoluble salt, techniques of solvent extraction and evaporation, crystallization are used.  Among these, evaporation is the best technique to separate the salts.

Size separation techniques sieving, sifting, and screening. These are used on the basis of differences in size, shape, and density between particles.

The technique of evaporation is used. The mixture of the two soluble and insoluble salts are added to water. The soluble salt is allowed to dissolve and the insoluble salt is filtered out. The soluble salt can be obtained by evaporating with water.

This method involves four stages :

To learn more about separation techniques,

https://brainly.com/question/21284824

#SPJ4

The forces to which limestone must be exposed to in order to change into marble is (c) heat and pressure.

Limestone has calcium carbonate in it. So, the chemical formula for this is CaCO₃. When it is burnt it gives lime. It is a sedimentary rock.

Sedimentary rocks are those rocks which are formed from deposition of already existing rocks of fossils on the surface of the earth.

Marble also has calcium carbonate in it. So, the chemical formula for this is also CaCO₃. It is a metamorphic rock.

Metamorphic rocks are formed when they have to face harsh conditions like heat and pressure etc.

To know more about limestone here

https://brainly.com/question/11726100

#SPJ1

Answer:

Carpooling with just one other person means that there is one fewer vehicle on the roads. That vehicle won't be emitting greenhouse gases during that commute.

Explanation:

The pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.

We know that an ionic solution is composed of ions. The ions in a solution are capable of interacting with reagents and this is the basis for the qualitative identification of ions in a solutions.

Now let us look at the options, we are going to look out for the option in which the addition of the chloride ion would lead to the emergence of a precipitate in the solution.

If we consider the solutions properly, we would see that the pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.

Learn more about solubility observations:https://brainly.com/question/15266111

#SPJ1

Missing parts;

Based on the solubility observations, which of the following pairs of cations could be distinguished by the addition of sodium chloride to the solutions?

Choose..

barium and lead

barium and aluminum

lead and silver

iron and calcium.

Answer:

HCl gas is collected by upward displacement of air because it is 1.28 times heavier than air. It is not collected in water because it is highly soluble in water.

Hope this helps you ;)

Explanation:

5.0 ml of 0.10 m solution of Naoh is added to 30. ml of buffer solution of acetic acid (0.093m) and sodium acetate (0.12 m), then the pH of the solution is 4.72

CH3COOH +H2O → H3O+ + CH3COO-

ka = [H3O+] {CH3COO-] / [CH3COOH] [H2O]

⇒ [H3O+] = ka X [CH3COOH] / [CH3COO-] → 1

Let us consider the concenration of H3O+ at equilibrium = x

Thus, putting the values in equation 1

[H3O+] = ka X [CH3COOH] / [CH3COO-]

x = (1.8X 10^-5 X 0.00329) / (0.0031)

⇒ x = 1.91 X 10^-5

since x is the equilibrium concentration of H3O+, SO

equilibrium concentration of H3O+ = 1.91X 10^-5

Then pH = -log10 {H3O+}

= -log10{1.91 X 10^-5}

=4.72

To know more about equilibrium, visit:

https://brainly.com/question/14281439

#SPJ4

At 15 °C, benzene has a density of 0.8787 g/ml. 131.8g make up 0.15 L of benzene's mass.

Density, mass of a unit volume of the material substance. The formula for density is d = M/V, where d is the density, M is mass, and V is volume. Density is commonly expressed in the units of grams per cubic centimeter. For example, the density of water is 1 gram per cubic centimeter, and the Earth’s density is 5.51 grams per cubic centimeter.

Density can also be expressed as the kilograms per cubic meter (in meter-kilogram-second or SI units). For example, the density of the air is 1.2 kilograms per cubic meter. The densities of common solids, liquids, and gases are listed in the textbooks and handbooks.

Density offers a convenient means of obtaining mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = V*d), while the volume is equal to the mass divided by the density (V = M/d). The weight of a body, which is usually of more practical interest than its mass, can be obtained by multiplying mass by the acceleration due to gravity.

There is a relationship between a substance's mass (m), volume (V), and density (d) that reads as follows:

d = m / V.

d = 0.8787 g/ml.

V = 0.15 x 1000 = 150 ml.

∴ the mass of 0.15 L of the benzene = d x V = (0.8787 g/ml) (150 ml) = 131.8 g.

To know more about acceleration visit: brainly.com/question/13860566

#SPJ4

Answer: I hope this helps.

Explanation:

An aspect of the kinetic-molecular theory and can be used to explain the behavior of plasmas is particle exchange energy through elastic collision.

In physics, an elastic collision is an encounter (collision) between the two bodies in which the total kinetic energy of the two bodies remains the same. In an ideal, perfectly elastic collision, there is no net conversion of the kinetic energy into other forms such as heat, noise, or potential energy.

During collision of small objects, kinetic energy is first converted to potential energy associated with a repulsive or attractive force between the particles (when the particles move against this force, i.e. angle between the force and the relative velocity is obtuse), then this potential energy is converted back to kinetic energy (when the particles move with this force, i.e. angle between force and the relative velocity is acute).

Collisions of the atoms are elastic, for example Rutherford backscattering.

A useful special case of the elastic collision is when the two bodies have equal mass, in which case they will simply exchange their momenta.

The molecules—as distinct from atoms—of gas or liquid rarely experience perfectly elastic collisions because kinetic energy is exchanged between the molecules’ translational motion and their internal degrees of freedom with each collision. At any instant, half collisions are, to a varying extent, inelastic collisions (the pair possesses less kinetic energy in their translational motions after the collision than before), and half could be described as “super-elastic” (possessing the more kinetic energy after the collision than before). Averaged across the entire sample, the molecular collisions can be regarded as essentially elastic as long as Planck's law forbids energy from being carried away by black-body photons.

To know more about collision visit: https://brainly.com/question/13138178

#SPJ4

The concentration of 250cm³ of a sodium chloride solution that has a mass of 11.70g is 0.8M.

The concentration or molarity of a solution can be calculated by dividing the number of moles by its volume as follows:

Concentration = no of moles ÷ volume

According to this question, 250cm³ of a sodium chloride solution has a mass of 11.70g. The concentration of the solution can be calculated as follows:

Molar mass of NaCl = 58.5g/mol

moles of NaCl = 11.70g ÷ 58.5g/mol = 0.2mol

Concentration = 0.2mol ÷ 0.250dm³

Concentration = 0.8M

Therefore, the concentration of 250cm³ of a sodium chloride solution that has a mass of 11.70g is 0.8M.

Learn more about concentration at: https://brainly.com/question/10725862

#SPJ1

The solubility of glucose is classified as a Supersaturated solution that is made by adding glucose to water at varying amounts for various compounds.

The maximum amount of the chemical that will get to dissolve in a given amount of solvent at a given temperature is referred to as the solubility of that solution. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair.

The creation of a new bond that is between the molecules of the solute and the solvent is known as the solubility. Solubility means the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.

The quantity of a chemical that can dissolve in water at a particular temperature is known as its water solubility. It is customary to measure solubility in mg/L (milligrams per liter) or ppm (parts per million).

To know more about solubility visit:

https://brainly.com/question/28170449

#SPJ4

Complete Question

The solubility of glucose at 30°c is 125 g/100 g water. A solution is made by adding 250 g of glucose to 100 ml of water at 30°c. Remember that 1 g water = 1 ml water. How would you classify this type of solution?

A) heterogeneous

B) saturated

C) supersaturated

d) unsaturated.

Answer:

How much matter something has

Density is how much matter something has.

The amount per unit of length, area, or volume: as. a: a substance's mass per unit volume. the distribution of a quantity per unit, typically of space, such as mass, power, or energy.

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the formula for density in mathematics: display style rho = frac mV. where m is the mass, V is the volume, and is the density.

The ratio of an object's mass to its volume is its density.

To learn more about Density from the given link:

brainly.com/question/15164682

#SPJ1

Anhydrous sodium sulphate is a common inert drying agent used in laboratories to get rid of any remaining water vapor in organic solutions. Therefore, it is needed in this experiment.

It is more effective yet takes longer to work than the same substance, magnesium sulphate. Sodium sulphate is a drying agent.

The fact that it is a fine powder with a lot of surface area makes it a fast-drying agent. Sodium sulphate (n=10, e=25 mg/L) is primarily used for very wet solutions and has a very high capacity.

It absorbs other polar substances like alcohols, etc., but it is particularly effective in ethereal solutions.

Although it has numerous additional uses, sodium sulphate is primarily employed in the production of detergents and in the Kraft process of paper pulping.

The decahydrate’s natural mineral form, mirabilite, accounts for about half of the world’s output, with the other half coming from chemical byproducts.

To know more about sodium sulphate visit:

https://brainly.com/question/14431654

#SPJ4

Answer:

C

Explanation:

Water's polarity help it to dissolve so many substances  as  water's oppositely charged ends are attracted to other charged ions and polar molecules.

water's polarity allows it to form covalent bonds with many substances because of water bent shape. it gives oxygen atom partial negative charge and hydrogen atom partial negative charge .the positive part attract and pull of negative part solute and the negative part attract and pull of positive part of solute.

Hydrocarbons are non polar molecule , they do not dissolve in polar solvent like water. so, water's polarity does not increases its ability to form ionic bond with ions and hydrocarbons.

Hydrophobic means water - fearing . this means the hydrophobic substances donot dissolve in water.

Thus, Water's polarity help it to dissolve so many substances  as  water's oppositely charged ends are attracted to other charged ions and polar molecules. hydrocarbons and hydrophobic substance do not dissolved in water.

To learn more about Water's polarity here

https://brainly.com/question/17628226

#SPJ4

Answer:

While alpha and beta rays have energy and mass, gamma rays are pure energy.

The additional information needed to calculate the molality of a 7.35 molar solution of a non-electrolyte solid dissolved in water is the density of that solid.

To calculate the molality(m) from the molarity(M) of a solution, the following formula is used

m = 1000M/M x MM- 1000d

Here MM is the molar mass of solute

And d is the density of the solute

As the other information like molarity and molar mass of the solute is already given to us, the additional information needed is density.

Thus, the additional information needed to calculate the molality of a 7.35 molar solution of a non-electrolyte solid dissolved in water is the density of that solid.

To know more about "molarity and molality",  refer to the link given below:

https://brainly.com/question/14591804?referrer=searchResults

#SPJ4

The amount of CO2 is produced is 60.28 g

In this combustion reaction , O2 act as a limiting reagent

96.0 g O2 = 3.0 mol O2 is present for the combustion reaction.

In the combustion reaction 60.4 g of water is formed

60.4 g of Water = 60.4 g * 1 mol / 18 g = 3.35 mol

3.35 mol of H20 has 6.32 mol of H atoms.

If hydrocarbon acts like limiting reactant , then 35.5 - 6.32 g of carbon = 29.18 g that is equal to 2.12 mol.

2.12 mol of C requires 2.12 mol * 2 = 4.24 mol of atoms to burn completely O atoms.

3.35 mol of H2O atom + 4.24 of O atoms = 7.59 mol. So, O2 is a limiting reactant.

3.35 mol of O2 atoms are in H2O , 6 - 3.35 = 2.65 mol of O2 atoms are there in CO2. Hence 1.37 mol of CO2 is going to produced.

Mass of CO2 produced = 1.37 * 44 = 60.28 g

By the law of conservation mass we found that 19.13 g of hydrocarbons remains unburnt.

To know more about Combustion reaction here :

https://brainly.com/question/12172040?referrer=searchResults

#SPJ4

Nuclear reactors are the main components of the nuclear power plants which are used for the production of heat through the process called fission.

The nuclear reactors are divided into many types which include:

The Breeder reactors are the type of reactors that has the ability to yield more energy than it can consume which makes it economical.

The Breeder reactors are different from the regular nuclear reactors because it utilizes either uranium-238 or thorium, while regular nuclear reactors makes use of isotope uranium-235.

An advantage of Breeder reactors is that they produce more fuel that it consumes while it's disadvantage is that it's more dangerous than a regular reactor.

Learn more about nuclear reactors here:

https://brainly.com/question/14400638

#SPJ1

Answer:

combining two or more substances, such that each maintains its chemical identity. In other

At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.

The sample solution's absorbance (A), as specified in the question, is 1.07. Beer's law is applied to determine the aspirin concentration, which is A = ebc.

Here, e is the extinction coefficient, which, according to the standard value for salicylic acid, is equal to 139.322 M-1cm-1, and b is the path length, which is equal to 1 cm. Now that we have our values,

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

It is now necessary to compare the value of concentration determined with the concentration of aspirin previously given in order to calculate the percent salicylic acid in the sample.

Aspirin's initial concentration, which is specified in the query, is 0.02 grammes. Aspirin has a molar mass of 240 g/mol.

Consequently, the aspirin molecules will be,

0.02 / 240 = 8.33 × 10^-5 moles  

The final volume of the diluted solution given is 10 ml or 0.01 liters.  

The molarity of aspirin in the diluted solution will be,  

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,  

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

Learn more about absorbance:

https://brainly.com/question/26555614

#SPJ4

The wavelength of blue light is 0.00000045 m. This wavelength in scientific notation is 4.5 × 10⁻⁷m.

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places adjacent crests in the consecutive cycles.

A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second and represents the number of vibrations that pass over a certain area in one second (Hz).

Thus,  This wavelength in scientific notation is 4.5 × 10⁻⁷m.

To learn more about wavelength, follow the link;

https://brainly.com/question/12924624

#SPJ2

A 28.0 g sample of iron‑59 to decay to 1.75 g would take 176 days if its half-life is 44 days.

From the first order kinetics, We know that

t= 2.303 × log A₀[tex]A_{t}[/tex]     ....  (1)

Here, t is the number of days it would take for the sample to decay.

K refers to the first-order rate constant,

A₀ refers to the concentration at time = 0

[tex]A_{t}[/tex] is the concentration at time t.

Given that,

Half-life of the iron-59, [tex]t_{\frac{1}{2}}[/tex] = 44 days

A₀ = 28 g

[tex]A_{t}[/tex] = 1.75 g

t =?

K =?

In order to find the rate constant use the formula

[tex]t_{\frac{1}{2}}[/tex] = 0.693/K

K = 0.693 / [tex]t_{\frac{1}{2}}[/tex]

= 0.693/44

= 0.01575 per day

Substitute all the values in (1), to get,

t = (2.303/0.01575)×log(28/1.75)

= 176.06 days

Therefore, for a 28.0 g sample of iron‑59 to decay to 1.75 g, would take 176 days.

To know more about the first order of kinetics, visit:

https://brainly.com/question/3139542

#SPJ4