Chemical principles for why we store food to keep from spoiling

QUESTION POSTED AT 14/01/2020 - 03:08 PM

Answered by admin AT 14/01/2020 - 03:08 PM

There are several factors that can brought food to damage and alterations in the taste and appearance can be done in different ways brought by chemical principles in processing methods including canning, dehydration (drying), smoking and freezing; the use of packaging; and the use of food additives such as antioxidants or other preservatives.
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Related questions

A pole-vaulter first converts kinetic energy into. a.. thermal energy.. b.. chemical energy.. c.. mechanical energy.. d.. elastic potential energy.. .

Answer: option d: elastic potential energy.

Explanation:

We know that energy possessed by a body due to virtue of its motion is known as kinetic energy and due to virtue of its position is known as potential energy.

A pole vaulter uses a long flexible pole as an aid for jumping over a bar. A pole vaulter gathers kinetic energy by sprinting down on runway and then lifts off and jumps using the pole to cross the bar. In this step, the pole vaulter converts kinetic energy into elastic potential energy.

ANSWERED AT 21/01/2020 - 10:28 AM


QUESTION POSTED AT 21/01/2020 - 10:28 AM

A student places a large pot of cold water on a stove and heats it for one minute. Then she takes the pot of water off the burner and places it on the counter. Which best describes the convection currents? Convection currents move thermal energy from the stove to the pot, and then the pot to the water. After the stove is turned off, convection currents continue to transfer energy through the water for a period of time. Convection currents in the water cause warmer, denser water to rise and transfer energy upward. When the stove is turned on, convection currents cause an increase in the chemical energy of water molecules.

Answer: option 2: After the stove is turned off, convection currents continue to transfer energy through the water for a period of time.

Explanation:

Convection currents transfer thermal energy in fluids. When a fluid is heated, the layer closer to the heat source gets warm. The lighter warm layer rises up and the denser cold layer takes its place and gets warm. The process continues till the entire fluid is evenly hot.

when the student places a large pot of cold water on a stove and heats for one minutes and then removes the pot off the burner. The convection currents continues to transfer energy through the water for a period of time till the entire water is evenly warm. Hence, the correct option is 2.

ANSWERED AT 21/01/2020 - 07:59 AM


QUESTION POSTED AT 21/01/2020 - 07:59 AM

A lake that stores water for human use is called

It's called a reservoir. 

ANSWERED AT 21/01/2020 - 06:44 AM


QUESTION POSTED AT 21/01/2020 - 06:44 AM

A chemical equation is balanced by changing or adding what?

A chemical equation is balanced by changing or adding coefficients. A type of reaction that produces an increase in temperature is exothermic.

ANSWERED AT 21/01/2020 - 03:17 AM


QUESTION POSTED AT 21/01/2020 - 03:17 AM

Energy that is stored is kinetic energy

That statement is false. Stored energy is potential energy. Kinetic is a word that refers to motion. Kinetic energy is the energy of motion not stored energy.

ANSWERED AT 21/01/2020 - 02:24 AM


QUESTION POSTED AT 21/01/2020 - 02:24 AM

Energy that is stored due to types of bonds and arrangement of atoms refers to ___________ energy a. kinetic c. physical b. chemical d. potential

The energy stored due to types of bonds and arrangement of atoms refers to potential energy. 

Due to the fact that potential energy is any stored energy of any object INCLUDING atoms

ANSWERED AT 21/01/2020 - 02:06 AM


QUESTION POSTED AT 21/01/2020 - 02:06 AM

The heat exchange in chemical reactions is due to a change in: kinetic energy enthalpy temperature physical properties

Answer: Option (b) is the correct answer.

Explanation:

Enthalpy is defined as the exchange of heat in chemical reactions. Enathlpy is denoted by \Delta H.

When \Delta H is positive then it means the reaction is endothermic whereas if  \Delta H is negative then it means the reaction is exothermic.

Whereas kinetic energy is the energy obtained due to motion of atoms. When we increase temperature then generally atoms gain kinetic energy.

Temperature is the measure of thermal energy of a reaction. On the other hand, physical properties are the properties that does not change the chemical composition of a substance.

Therefore, we can conclude that the heat exchange in chemical reactions is due to a change in enthalpy.

ANSWERED AT 20/01/2020 - 09:45 PM


QUESTION POSTED AT 20/01/2020 - 09:45 PM

Kevin is standing outside a railway station. He can know whether a train is approaching the station or departing from the sound it makes. Which principle of sound waves is he using?

It looks like Doppler effect. Sound waves passing through a big way until they get to your ears. We got the highest frequency when we receive it, while it goes it remains the same and when it goes down we receive lower frequency.

ANSWERED AT 20/01/2020 - 09:24 PM


QUESTION POSTED AT 20/01/2020 - 09:24 PM

Chemical weathering is most rapid in areas that are

Chemical weathering is most rapid in such areas that are warm in temperature. Basically, these are places that experience tropical weather. This is because places with tropical weather experience the most precipitation, which is an essential process in chemical weathering.

ANSWERED AT 20/01/2020 - 08:22 PM


QUESTION POSTED AT 20/01/2020 - 08:22 PM

Which of the following cannot be determined from the spectrum of a star? the chemicals in the atmosphere of the star the motion of the star the temperature of the atmosphere of the star the chemicals in the core of the star

A star’s spectrum contains information about its temperature, chemical composition, and intrinsic luminosity.

The motion of the star cannot be determined from the spectrum of a star

ANSWERED AT 20/01/2020 - 07:26 PM


QUESTION POSTED AT 20/01/2020 - 07:26 PM

When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occurred?

Nope, color change can also occur during a physical change. 

ANSWERED AT 20/01/2020 - 06:39 PM


QUESTION POSTED AT 20/01/2020 - 06:39 PM

What is Bernoulli's principle???

The Bernoulli's principle is the principle in hydrodynamics that an increase in the velocity of a stream of fluid results in a decrease in pressure.

ANSWERED AT 20/01/2020 - 06:22 PM


QUESTION POSTED AT 20/01/2020 - 06:22 PM

The orbiting of the moon around the Earth can be explained by a. the universal gravitational law. b. Newton's first law. c. the law of energy conservation. d. Pascal's principle.

When talking about orbits, it would have to be a mixture of both A. and B. since Newton's first law, gravity plays a huge part in an orbit. However, the universal gravitation law also tells us the relationship between two massive objects in orbit. But to choose only one, it would have to be B. Newton's first law

ANSWERED AT 20/01/2020 - 06:02 PM


QUESTION POSTED AT 20/01/2020 - 06:02 PM

Why are food and water the limiting factors that usually have the greatest effect on population size?

Because if you have a large population, there is a need for more food and water, but if you don't have enough food and water to support a large population, that limits it from happening

ANSWERED AT 20/01/2020 - 05:37 PM


QUESTION POSTED AT 20/01/2020 - 05:37 PM

The _____ rip and grind food into small chunks.

It would have helped to answer this question, if there were some options to choose from. I am answering the question based on what i understood. I hope that it helps you. The teeth rip and grind food into small chunks. This is also the main function of the teeth and it does help in the digestion of the food we take.

ANSWERED AT 20/01/2020 - 05:26 PM


QUESTION POSTED AT 20/01/2020 - 05:26 PM

Which of the following cannot be determined from the spectrum of a star? the chemicals in the atmosphere of the star the motion of the star the temperature of the atmosphere of the star the chemicals in the core of the star

Answer:

The chemicals in the core of the star

Explanation:

The spectrum of a star is of its atmosphere. The absorption or emission spectrum that is obtained indicates the chemical composition of the star's atmosphere. The peak wavelength obtained indicates the surface temperature of the star (using Wien's-Displacement Law). The shift in the spectrum indicates the motion of the star. If there is blueshift, it indicates that it is moving towards us where as if there is a red shift, it indicates that it is moving away from us.

ANSWERED AT 20/01/2020 - 11:44 AM


QUESTION POSTED AT 20/01/2020 - 11:44 AM

All life that we know of is based on carbon. Carbon's ability to form many chemical bonds is an important characteristic that allows it to form the basis of life. Identify two other elements that can probably also form a large number of bonds and that probably have similar properties to carbon.

Starch and cellulose have the same substance but different structures. They are both polysaccharides. The basic unit of a polysaccharide is the glucose. Glucose, which contains carbon, hydrogen, and oxygen, have two forms. The alpha-glucose with an alcohol group attached to carbon 1 is down and the beta-glucose with the alcohol group attached to carbon 1 is up. Starch is the alpha-glucose while cellulose is the beta-glucose. Starches are linked into a straight chain whereas the cellulose are connected like a pile of stack paper. When the human body eats starch, it can digest the starch but not the cellulose because it has no enzyme that can break it down. 

ANSWERED AT 20/01/2020 - 01:50 AM


QUESTION POSTED AT 20/01/2020 - 01:50 AM

When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occurred? Yes because any change indicates a chemical reaction. No because some physical changes produce color changes. No because color changes are not indicators of chemical reactions. Yes because color changes occur only when new compounds are formed.

Answer: Yes because color changes occur only when new compounds are formed.

Explanation: Chemical change is a change when the rearrangement of atoms take place and formation of new substances take place.

Physical change is a change when there is no rearrangement of atoms and there is only change in shape and size and no new substances are formed.

Chemical change is accompanied by following changes:

1. Absorption or release of energy

2. Change in color

3. Evolution of gas

4. Formation of precipitates

ANSWERED AT 20/01/2020 - 01:27 AM


QUESTION POSTED AT 20/01/2020 - 01:27 AM

Explain the working principle of a pressure filter

The pressure filter, is something you enter before entering a base on space. When you step inside it filters the pressure to the exact it would be on earth.

ANSWERED AT 19/01/2020 - 11:51 PM


QUESTION POSTED AT 19/01/2020 - 11:51 PM

The statement that "The universe is the same everywhere and does not change over time" is known as _____. a. the cosmological principle b. the perfect cosmological principle c. the oscillating universe theory d. the steady state theory

Answer: b. the perfect cosmological principle

Explanation:

The perfect cosmological principle is the extension of the cosmological principle. It states that the universe is homogeneous. It looks same from everywhere. It will look the same. It will never change over time instead of some of the gross changes occurring in the universe.

ANSWERED AT 18/01/2020 - 11:58 AM


QUESTION POSTED AT 18/01/2020 - 11:58 AM

Consider that the room is a closed system. Ryan uses the chemical energy in his muscles to create the energy of motion. He uses this energy of motion to pull the string on the clapper of a bell to produce a sound. Sound fills the room. Which describes the energy in this room?

There are quite a few sources of energy being displayed in the room. First chemical energy, then mechanical energy, and finally sound energy. Despite the number of transformations happening, the total energy content remains the same. This is due to the law of conservation of energy which states that energy cannot be created nor destroyed. It can only be transformed from one form to another.

ANSWERED AT 18/01/2020 - 10:51 AM


QUESTION POSTED AT 18/01/2020 - 10:51 AM

A food web diagrams the interactions between organisms based on which organisms others are eating. A scientist is using a food web to predict the predator-prey relationship of a population. What can a food web best be classified as?

As a food web diagrams the interactions between organisms based on which organisms the others are eating, a food web can most likely be classified as a graph. A food web is usually a graphical representation of the interactions between organisms, showing patterns and data which provide statistical analysis on the matter. 

ANSWERED AT 18/01/2020 - 09:56 AM


QUESTION POSTED AT 18/01/2020 - 09:56 AM

The elements in Group 2 have similar chemical properties because each atom of these elements has the same

Number of electrons in the outer energy shell

ANSWERED AT 18/01/2020 - 06:41 AM


QUESTION POSTED AT 18/01/2020 - 06:41 AM