Categories
Assignment Help

In science class, Savannah measures the temperature of a liquid to be 34 celsius. Her teacher wants her to the temp to degrees fahrenheit.What is the temp of Savannahs liquid to the nearest degree fahrenheit?

[ad_1]

In science class, Savannah measures the temperature of a liquid to be 34 celsius. Her teacher wants her to the temp to degrees fahrenheit.What is the temp of Savannahs liquid to the nearest degree fahrenheit?

[ad_2]

Categories
Assignment Help

Select all that apply. Which of the following statements are true? A solid can diffuse into a liquid, but a solid cannot diffuse into another solid. A solid can diffuse into both a liquid and another solid. A liquid can diffuse into another liquid. A gas can diffuse into another gas.

[ad_1]

Select all that apply. Which of the following statements are true? A solid can diffuse into a liquid, but a solid cannot diffuse into another solid. A solid can diffuse into both a liquid and another solid. A liquid can diffuse into another liquid. A gas can diffuse into another gas.

[ad_2]

Categories
Assignment Help

What should i write on a essay about glue and liquid corn starch

[ad_1]
What should i write on a essay about glue and liquid corn starch
[ad_2]

Categories
Assignment Help

HELP PLEASE! 3 SCIENCE QUESTIONS! I'm stuck on my last 3. #1 Compare and contrast chemical change and physical change. #2 Compare and contrast a gas and a plasma. #3 What state of matter has the electrons separated from the nuclei of the atoms? Gas Solid Liquid Plasma

[ad_1]

HELP PLEASE! 3 SCIENCE QUESTIONS! I’m stuck on my last 3. #1 Compare and contrast chemical change and physical change. #2 Compare and contrast a gas and a plasma. #3 What state of matter has the electrons separated from the nuclei of the atoms? Gas Solid Liquid Plasma

[ad_2]

Categories
Assignment Help

In the story “To Build a Fire,” what information did the man ignore? Even though the creeks freeze solid, liquid water exists near springs. Always make camp and build a fire while there is still daylight. Always take along survival gear and wear protective clothing. No one must travel alone in the Klondike after fifty degrees below zero.

[ad_1]

Answered by answersmine AT 22/10/2019 – 03:28 AM

No one must travel alone in the Klondike after fifty degrees below zero. I would say this is the main lesson to learn about this Jack London story which shows that nature can be cruel and unforgiving and at 50 degrees below zero it is nothing to fool with. If there are two people, one can help the other and warn say of snow which may fall down and douse the fire and also both can have matches to start a fire and they can discuss the best course of action in any situation which presents itself such as trusting the ice not to break over a creek for example.

Post your answer

[ad_2]

Categories
Assignment Help

The dimensions of a conical funnel are shown below: Nisha closes the nozzle of the funnel and fills it completely with a liquid. She then opens the nozzle. If the liquid drops at the rate of 15 cubic inches per minute, how long will it take for all the liquid to pass through the nozzle? ( use pi= 3.14)

[ad_1]

The dimensions of a conical funnel are shown below: Nisha closes the nozzle of the funnel and fills it completely with a liquid. She then opens the nozzle. If the liquid drops at the rate of 15 cubic inches per minute, how long will it take for all the liquid to pass through the nozzle? ( use pi= 3.14)

[ad_2]

Categories
Assignment Help

Why is water an excellent solvent for most ionic compounds and polar covalent molecules but not for non-polar compounds? A) Water is a polar molecule. B) Water has a charge like an ion. C) Water is a deionizing substance. D) Water molecules have an unusually high kinetic energy in the liquid state.

[ad_1]

A)Water is a polar molecule. When talking about solubility, the rule that “like dissolves like” is usually correct. This means that polar substances are soluble in other polar substances. This occurs because the opposite partially charged ends of different polar molecules are attracted to each other. Similarly, the partially charged ends of polar molecules will be even more attracted to the charged ends of an ionic compound’s molecule. This is why,for example, table salt/ NaCl, which is an ionic compound, dissolves in water. 

[ad_2]

Categories
Assignment Help

The volume of 100 drops of a liquid is 0.01 fluid ounce. What is the volume of 10 drops?

[ad_1]

The volume of 100 drops of a liquid is 0.01 fluid ounce. What is the volume of 10 drops?

[ad_2]

Categories
Assignment Help

Which of the following is an example of a scientific question that is not testable? Why is the sky blue? How moist should soil be for a tomato seed to sprout? Is the strength of steel related to the amount of carbon in it? Does the rate of cooling of a liquid depend upon its initial temperature?

[ad_1]

Which of the following is an example of a scientific question that is not testable? Why is the sky blue? How moist should soil be for a tomato seed to sprout? Is the strength of steel related to the amount of carbon in it? Does the rate of cooling of a liquid depend upon its initial temperature?

[ad_2]

Categories
Assignment Help

Which energy changes are associated with a liquid freezing? Energy is released as potential energy increases. Energy is absorbed as potential energy increases. Energy is released as potential energy decreases. Energy is absorbed as potential energy decreases.

[ad_1]

Which energy changes are associated with a liquid freezing? Energy is released as potential energy increases. Energy is absorbed as potential energy increases. Energy is released as potential energy decreases. Energy is absorbed as potential energy decreases.

[ad_2]

Categories
Assignment Help

A recipe for candy requires that the liquid ingredients be stirred constantly until the liquid reaches a temperature of 140°C. What type of spoon – wood or metal – will prevent burns to a person’s hand while stirring the hot liquid? Explain your choice.

[ad_1]

Sample Response: A wooden spoon will prevent the person’s hand from burning because wood is an insulator. An insulator slows the transfer of thermal energy so that very little thermal energy from the hot liquid will transfer to the person’s hand. 

include:

-A wooden spoon will prevent the person’s hand from burning.

-Wood is an insulator.-An insulator slows the transfer of thermal energy.-The wooden spoon will transfer very little thermal energy to the person’s hand.

you’re welcome lol

[ad_2]

Categories
Assignment Help

In 1987 the first substance to act as a superconductor at a temperature above that of liquid nitrogen (77 k) was discovered. the approximate formula of this substance is yba2cu3o7. calculate the percent composition by mass of this material.

[ad_1]

 

The molar mass of the elements are:

Yttrium (Y) = 88.91 g / mol

Barium (Ba) = 137.33 g / mol

Copper (Cu) = 63.55 g / mol

Oxygen (O) = 16 g / mol

 

Calculating for the molar mass of YBa2Cu3O7:

YBa2Cu3O7 = 88.91 + 2(137.33) + 3(63.55) + 7(16) = 666.22
g / mol

 

The masses of the elements in 1 mole of YBa2Cu3O7 are:

Yttrium (Y) = 88.91 g / mol (1 mole) = 88.91 g

Barium (Ba) = 137.33 g / mol (2 mole) = 274.66 g

Copper (Cu) = 63.55 g / mol (3 mole) = 190.65 g

Oxygen (O) = 16 g / mol (7 mole) = 112 g

 

We now calculate for the percent composition by mass of
each element:

% Y
= 88.91 g / 666.22 g = 13.35%


% Ba
= 274.66 g / 666.22 g = 41.23%


%Cu
= 190.65 g / 666.22 g = 28.62%


%O =
112 g / 666.22 g = 16.81%

[ad_2]

Categories
Assignment Help

An action movie production team needs glass spheres to hold a green liquid that looks like an explosive l. if all of the available 3,392’92 cubic inches of the liquid is to be poured into 30 glass spheres l, what should the diameter of each sphere be. assume that each sphere is filled to the top

[ad_1]

We need 30 glass spheres whose TOTAL volume = 3,392.92 cubic inches.
Therefore each of the 30 spheres must have a volume of  3,392.92 / 30 =



113.0973333333



cubic inches
Sphere Volume   =   4/3 • π • r³
radius^3 =
Sphere Volume / (4/3 • π)
radius^3 = 113.0973333333 /



4.1887902048




radius^3 =



26.9999994758




radius = 3 inches
diameter = 6 inches

[ad_2]

Categories
Assignment Help

The volume of 1000 drops of a liquid is 1 fluid ounce. What is the volume of 100 drops?

[ad_1]

Solution:

The Given Rectangle having dimensions

Length = 80 cm

Breadth = 50 cm

Let the Six squares which has been cut from this rectangle have side of length a cm.

Area of each square = (Side)²= a²

Area of 6 Identical Squares = 6 × a²= 6 a²

If four squares are cut from four corners and two along Length,

then , Length of Box = (80 – 3 a)cm, Breadth of Box = (50 – 2 a)cm, Height = a cm

Volume of Box =V = Length × Breadth × Height

    V = (80 – 3 a)× (50 – 2 a)× a

     V   = 4000 a – 310 a² + 6 a³

For Maximum Volume

V’= 0 , where V’ = Derivative of V with respect to a.

V’= 4000 – 620 a + 18 a²

V’ =0

18 a² – 620 a + 4000= 0

9 a² – 310 a + 2000=0

using determinant method

a = frac{310pmsqrt{96100-72000}}{18}=frac{310pm155}{18}=frac{310-155}{18}=8.6 cm

V”=1 8 a – 310 = -ve

which shows , when a = 8.6 cm , volume is maximum.

So, V = 4000×8.6 – 310×(8.6)²+6×(8.6)³=15288.736 cm³

OR

If four squares are cut from four corners and two along Breadth,

then , Length of Box = (80 – 2 a)cm, Breadth of Box = (50 –  3 a)cm, Height = a cm

Volume of Box =V = Length × Breadth × Height

    V = (80 – 2 a)× (50 – 3 a)× a

     V   = 4000 a – 340 a² + 6 a³

For Maximum Volume

V’= 0 , where V’ = Derivative of V with respect to a.

V’= 4000 – 680 a + 18 a²

V’ =0

18 a² – 680 a + 4000= 0

9 a² – 340 a + 2000=0

Using Determinant method

a = frac{340pmsqrt{115600-72000}}{18}=frac{340pm209}{18}=frac{131}{18}=7.6 cm

V”=18 a -340= -ve value when a = 7.6 cm, shows volume is maximum when a = 7.6 cm

V= 4000×7.6 -340 × (7.6)² +6× (7.6)³=13395.456 cubic cm

[ad_2]

Categories
Assignment Help

As a substance changes phase from a gas to liquid to solid: A- The spacing between molecules increases. B- It's density generally increases. C- The spacing between molecules is not affected. D- It undergoes chemical change.

[ad_1]

As a substance changes phase from a gas to liquid to solid: A- The spacing between molecules increases. B- It’s density generally increases. C- The spacing between molecules is not affected. D- It undergoes chemical change.

[ad_2]

Categories
Assignment Help

What is the effect of temperature on the solubility of a solid in a liquid

[ad_1]

What is the effect of temperature on the solubility of a solid in a liquid

[ad_2]

Categories
Assignment Help

We can change a gas to liquid by the temperature and the pressure. NextReset

[ad_1]

We can change a gas to liquid by the temperature and the pressure. NextReset

[ad_2]

Categories
Assignment Help

Which term best describes liquid behavior under pressure?

[ad_1]

Which term best describes liquid behavior under pressure?

[ad_2]

Categories
Assignment Help

At which point could the substance shown exist as a gas or a solid but not a liquid?

[ad_1]

Answer: The correct answer is all of these.

Explanation:

Organic compounds are defined as the chemical compounds where one or more carbon atoms are covalently bonded to other atoms of hydrogen, oxygen or nitrogen.

They occur naturally in nature and the main sources of these organic compounds are petroleum, coal and natural gases.

Petroleum are the naturally occurring substances which contain organic compounds in the form of gases, liquid or semi-solid. Thus, they are a major source of organic compound.

Coal is also a form of fossil fuel which are the major source of organic compound.

Natural gas contains hydrocarbons and also is the major source of organic compounds.

Thus, the correct answer is all of these.

[ad_2]

Categories
Assignment Help

55 kg of liquefied natural gas (lng) are stored in a rigid, sealed 0.17 m3 vessel. in this problem, model lng as 100% methane. due to a failure in the cooling/insulation system, the temperature increases to 200 k, which is above the critical temperature; thus, the natural gas will no longer be in the liquid phase.

[ad_1]

55 kg of liquefied natural gas (lng) are stored in a rigid, sealed 0.17 m3 vessel. in this problem, model lng as 100% methane. due to a failure in the cooling/insulation system, the temperature increases to 200 k, which is above the critical temperature; thus, the natural gas will no longer be in the liquid phase.

[ad_2]

Categories
Assignment Help

According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition? The reactants and the products are in the solid phase. The reactants and the products are in the liquid phase. Some of the reactants or the products are in the gaseous phase. Some of the reactants or the products are solid, and some are liquid.

[ad_1]

This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

[ad_2]

Categories
Assignment Help

According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition? The reactants and the products are in the solid phase. The reactants and the products are in the liquid phase. Some of the reactants or the products are in the gaseous phase. Some of the reactants or the products are solid, and some are liquid.

[ad_1]

This problem is to apply Roult’s Law.

Roult’s Law states that the vapor pressure, p, of a solution of a non-volatile solute is equal to the vapor pressure of the pure solvent, Po solv, times the mole fraction of the solvent, Xsolv

p = Xsolv * Po sol

X solv = number of moles of solvent / number of moles of solution

The solvent is water and the solute (not volatile) is glycerin.

Number of moles = mass in grams / molar mass

mass of water = 132 ml * 1 g/ml = 132 g

molar mass of water = 18 g/mol

=> number of moles of water = 132 g / 18 g/mol = 7.33333 mol

mass of glycerin = 27.2 g

molar mass of glycerin:, C3H8O3: 3 * 12 g/mol + 8 * 1 g/mol + 3*16 g/mol = 92 g/mol

number of moles of glycerin = 27.2g / 92 g/mol = 0.29565

total number of moles = 7.33333 moles + 0.29565 moles = 7.62898 moles

=> X solv = 7.33333 / 7.62898 = 0.96125

=> p = 0.96125 * 31.8 torr ≈ 30.57 torr ≈ 30.6 torr.

Answer: 30.6 torr

[ad_2]

Categories
Assignment Help

Tim mixed 2 parts vinegar and 5 parts water to make a cleaning liquid. How many parts of vinegar did Tim mix with each part of water?

[ad_1]

The triangle ABC is similar to triangle LMP. The order here is very important. The letters correspond to one another
A corresponds to L (first letters of each sequence) 
B corresponds to M (second letters of each sequence)
C corresponds to P (third letters of each sequence)

In a similar fashion, the segments also correspond to one another. 
AB corresponds to LM (first two letters of each sequence)
AC corresponds to LP (first and last letters of each sequence)
BC corresponds to MP (last two letters of each sequence)

————————————

AB corresponds to LM. AB is 4 units long. LM is 2 units long. So AB is twice as long as LM. This ratio (of 2:1) will be applied to every paired corresponding value.

Also, the right angle is at angle M for triangle LMP. The right angle will be at angle B for triangle ABC (since B corresponds to M). The answer will have an x coordinate of 7. So the answer is either choice B or choice C.

If we move 4 units down from point B, we land on (7,-10). That isn’t listed as an answer choice. Let’s try moving 4 units up from point B. We land on (7,-2). This is an answer choice

So the final answer is choice C) (7,-2)

[ad_2]

Categories
Assignment Help

Instructions:Select the correct answer. Why does a solid change to liquid when heat is added? A-The spacing between particles decreases. B-Particles lose energy. C-The spacing between particles increases. D-The temperature decreases.

[ad_1]

There are two systems in the human body that are responsible for the coordination between the functions of different systems to achieve the unity of the living organism’s body. These two systems are the nervous system and the endocrine system. The action of the nervous system is fast and takes a short time, while the action of the endocrine system is slow and takes a long time.

The functional unit of the nervous system is the nerve cell or the neuron. The neuron consists of a cell body and the axon. The cell body starts with the dendrites that receive the messages or the impulses from other neurons or from different sense organs or receptors. These impulses are then transmitted through the cell body. The cell body contains a nucleus and different organelles which help the nerve cell to perform its functions. The nerve impulse is then transmitted to the axon.

The axon is an extension from the cell body. There are some cells called Schwan cells that secrete a myelin sheath to insulate the axon from the surrounding medium. The insulated axons have more ability to conduct the impulses than non-insulated axons. The axon ends with the terminal arborizations. The terminal arborizations of a nerve cell connect to the dendrites of the next cell or to the afferent organ. The gaps between the dendrites and the terminal arborizations are called the synapses.

The nerve impulse is an electrochemical phenomenon i.e. an electrical phenomenon with a chemical nature. The membrane of the axon acts as a barrier between an outside positively charged medium and an inside negatively charged medium. This makes a potential difference of  -70mV. This state is called the resting potential. When the membrane is subjected to a stimulus, the positive charges enter to inside and the negative charges exit to the outside. The potential difference now becomes +40mV. This state is called the depolarization state. The point of stimulation acts as a new stimulus for the next point and so on. The membrane sooner gains its permeability again and the positive charges return to the outside and the negative charges to inside. This state is called repolarization.

The nerve impulse reaches the synapse. There are some neurotransmitters that are excited by the nerve impulse coming and carry the message across the membrane. Some receptors receive theses neurotransmitters on the dendrites of the next neuron. These receptors act as a stimulus for the new cell.

[ad_2]

Categories
Assignment Help

A funnel is made up of a partial cone and a cylinder as shown in the figure. The maximum amount of liquid that can be in the funnel at any given time is 16.59375π cubic centimeters. Given this information, what is the volume of the partial cone that makes up the top part of the funnel?

[ad_1]

A funnel is made up of a partial cone and a cylinder as shown in the figure. The maximum amount of liquid that can be in the funnel at any given time is 16.59375π cubic centimeters. Given this information, what is the volume of the partial cone that makes up the top part of the funnel?

[ad_2]