What are some natural processes that represent physical and chemical changes?


this is in science, but it made me choose chemistry

The technical term for the study of the origins of the universe is cosmogony, although informally the term cosmology covers this as well. Answer: The universe is composed of matter and energy.

The origin of the universe, its elements, and its structure are studied in the field of astronomy which is referred to as cosmology. It also studies the evolutionary theory of the universe.

Cosmology is the astronomical branch that studies and analyzes the evolution and origin of the universe and the celestial or astronomical bodies found in them.

It is a scientific study that explores and researches the physical and chemical properties of the universe and its element based on the hypothesis and observed facts.

It even deals with the human and organismic origin and earth as the only planet that sustains life. The big bang theory is the most exemplified study in cosmology.

Therefore, cosmology is the study of the origin and structure of the universe.

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vinegar and antacids.

a: is the correct anwser

Final answer:

A graduated cylinder is the correct tool for measuring the volume of liquid, with readings taken at the meniscus's lowest point. Pan balances and scales measure mass, not volume, and metric rulers are for measuring length.

Explanation:

The student asked which tool could be used to measure the volume of a liquid. The correct answer is a graduated cylinder. Graduated cylinders are precision instruments commonly used in labs to measure liquid volumes accurately. They can measure in units such as milliliters (mL) and centiliters (cL), offering flexibility for small or large amounts.

To use a graduated cylinder, you should first place it on a level surface and then pour the liquid into the cylinder. Observe the liquid level and make a reading at the bottom of the meniscus, the curve seen at the top of the liquid layer. The meniscus occurs because of the surface tension of the liquid in contact with the container. The correct volume will be where the lowest point on the meniscus aligns with the cylinder's measuring scale.

Other instruments such as a pan balance, scale, and metric ruler are not suitable for measuring liquid volumes. A pan balance and a scale are designed to measure mass, and a metric ruler is typically used for measuring lengths.

Answer:

Kevin’s weight may change between Planet X and Planet Y.

Explanation:

Mass is the amount of matter contained in an object. Gravity is Earth’s pull of a body towards its centre.  

Weight (W) is product of the mass (m) of the object and the force of gravity (g) acting on the object.  

W = mg  

The force of gravity may change between Plant X and Planet Y, and thus Kevin’s weight may change between Planet X and Planet Y.  

Answer:

Kevin’s weight may change between Planet X and Planet Y.

Explanation:

yes jaja

Resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.

Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies or resonance frequencies. At resonant frequencies, small periodic driving forces have the ability to produce large amplitude oscillations, due to the storage of vibrational energy.

The dependent variable is 'Number of plants' which is the correct answer.

The independent variable is CO₂ levels in ocean water, however, the growth of plants in ocean water depends on the CO₂ levels. Higher CO₂ is level is conducive to the growth of plants.

Plants use CO₂ and water in photosynthesis to prepare food in the presence of light.

6CO₂ + 6H₂O + light energy = C₆H1₁₂O₆ + 6O₂.

Answer:Number of plants.

Explanation:

When any experiment is conducted then there are two variables in the experiment. One of the variable is independent variable that we can change according to the need of the experiment.

Then the result of the experiment is known as dependent variable which depends on the independent variable.

Here, the concentration of carbon dioxide can be changed and is known as independent variable but the number of plants that will grow in the given carbon dioxide concentrations is dependent variable.

Answer:

The answer is A) Radiation can move through empty space to transfer heat; conduction cannot.

Explanation:

Answer: It is A (Radiation can move through empty space to transfer heat; conduction cannot)

Explanation:

Its the straight segment C because its position is not going up or down, so it is not moving.

The motion of an object at rest is represented by a straight line with a slope of zero in a motion graph, likely represented by straight segment C in this case. Curves and lines with slopes indicate motion with either constant or variable speed. Understanding acceleration representation and the concept of reference frames is also critical while interpreting motion graphs.

An object at rest would be represented in a motion graph by a straight line with a slope of zero. This is because the velocity, or speed, of an object at rest remains constant over time, which is zero. In this situation, straight segment C likely represents the motion of an object at rest if it is a horizontal line with no slope. Conversely, curves and lines with slopes indicate motion with either varying or constant velocity.

Additionally, it's important to understand that acceleration (change in velocity over time) can be represented graphically as well. Horizontal lines at some positive or negative value on an acceleration vs. time graph indicate constant acceleration, while variable lines suggest changing acceleration.

Finally, when interpreting such graphs, remember that the concept of reference frames plays a crucial part in understanding motion. As a visual representation, the motion graph describes the motion of an object relative to a defined point of reference. Hence, changing the frame of reference can drastically change the interpretation of the graph.

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Answer:

A. coefficients

Explanation:

Balancing the chemical reaction -

As , we know , atoms can not be created and destroyed , hence their is only the transfer of atoms , which take place in a chemical reaction .

Hence , it is important to balance a chemical reaction .

for any reaction , the atoms are balanced by using certain whole number that are placed as a coefficient .

As, is the numbers are placed as superscripts or subscripts, it will alter the  chemical structure of the compound .

Hence , the correct answer is A. coefficients .

The correct answer is, the amount of products and reactants is constant.

You have to combine each element on each side together.

You would do

1-Na-1 because there is 1 Na on each side

2-H-3 because there is 2 H on one side and 3 H on the other side

1-O-1 because 1 O on one side and 1 O on the other

Your final answer would be 2Na+2H2O-->2NaOH+H2

Hope I could help! :)

Hello!

In chemistry, compounds can have one of two properties. Acidic and Basic.

To determine whether a compound/solution/test subject is basic or acidic, you need to look for the pH level. pH is a unit scale for your understanding.

1-6 on the pH scale means an item is acidic.

7 on the pH scale tends to be what we consider even ground as it matches the closest to the human bodies pH level.

Anything greater than 7 is considered basic.

Examples of basic solutions and compounds are many bleaches, milk of magnesia, ammonia, even limewater!

I hope this gives you an answer to your question.

In chemistry, a base is a substance that can either release hydroxyl ions (OH⁻) in solution or accept hydrogen ions (H⁺).

A base in chemistry can be defined from several perspectives. According to the Bronsted-Lowry theory, a base is a substance that can accept hydrogen ions (H⁺), which is equivalent to being a proton acceptor. Alternatively, the Lewis theory defines a base as an electron pair donor.

Common characteristics of bases are that they are slippery to the touch, have a bitter taste, and can change the color of indicators (such as turning red litmus paper blue). They also react with acids to form salts and water, and promote certain chemical reactions (base catalysis).

One of the most straightforward ways to identify a base is by its ability to release hydroxyl ions (OH⁻) in solution. These hydroxyl ions can then combine with hydrogen ions (H⁺) in the solution, leading to the formation of water (H₂O).

Accuracy

Hope this helps!!

Accuracy is a measure of how close a measurement is to its true value, and it is influenced by systematic errors. It differs from precision, which is about the consistency of repeated measurements. An accurate measurement aligns closely with the accepted true value.

Accuracy is a measure of how close a measurement is to its true value. In science, accuracy is crucial because it indicates the degree to which a measured value aligns with the accepted true value of that quantity.

The correct answer is option B.

The hematite particles rearrange to form a new substance. This is an example of a chemical change.

A chemical change is an irreversible process wherein the atoms of a substance undergoes a rearrangement that causes it to from a new substance with  unique chemical properties.

Answer:

B. The hematite particles rearrange to form a new substance.

Explanation:

PLATO

Answer: The products in the given chemical reaction are [tex]8CO_2\text{ and }10H_2O[/tex]

Explanation:

Reactants are defined as the species which react in the reaction and are written on the left side of the reaction arrow.

Products are defined as the species which are produced in the reaction and are written on the right side of the reaction arrow.

For the given chemical equation:

[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]

The reactants of the above reaction are [tex]2C_4H_{10}\text{ and }13O_2[/tex] and the products are [tex]8CO_2\text{ and }10H_2O[/tex]

Hence, the products in the given chemical reaction are [tex]8CO_2\text{ and }10H_2O[/tex]

Answer:

B

Explanation:

Reactants are defined as the species which react in the reaction and are written on the left side of the reaction arrow.

Products are defined as the species which are produced in the reaction and are written on the right side of the reaction arrow.

A common function of proteins and carbohydrates in the plasma membrane is cell recognition and interaction.

A carbohydrate is defined as a bio-molecule which consists of carbon,hydrogen and oxygen atoms which are usually in the ratio of 2:1 with the empirical formula C[tex]_n[/tex](H₂O)[tex]_n[/tex].

This term is most commonly used in biochemistry as a synonym of saccharide which is a group of sugars, starch and cellulose.

They perform various functions in living organisms. They serve as an energy source and as well as structural components . They are a key component in providing nutrition and are found in wide variety of natural as well as processed foods.

Carbohydrates occur as cellulose in the cell walls of plants and is one of the components of insoluble dietary fibers.

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The range of all forms of radiant energy is called the electromagnetic spectrum. It ranges from extremely long radio waves to extremely short gamma rays.

Answer:

Uneven heating

Explanation:

initial condition : Vi = 4.700 L , Ti = 71.0ºC +273 => 344 K

final condition : Vf = 3.300 L , Tf = ?

Pressure is constant:

According to charle's law , volume is directly proportional to temperature at constant pressure !

Hence  Vi / Ti  = Vf / Tf

4.700 L / 344 K = 3.300 L / Tf

Tf =  3.300 L * 344 K / 4.700 L

Tf = 1135200 / 4.700

Tf = 241.53 K

Tf = 241.53 - 273

Tf = -31.47ºC

The answer is C. Filtration

Answer : The correct option is, (C) Filtration.

Explanation :

Chromatography : It is a type of separation process in which the liquid or gas is separated into components at different rate.

Distillation : It is a type of separation process in which the mixture of liquid separated or evaporated at different temperatures.

Filtration : It is a type of mechanical separation process in which the solid is separated from the liquid through the filter paper.

Fragmentation : It is a type of process where the molecular ion breaks into the smaller ions or smaller radicals or neutral molecules.

Condensation : It is a type of process in which the phase changes from gaseous state to liquid state at constant temperature.

Hence, the correct option is, (C) Filtration.

A food web illustrates a snake eating a rat. What is the role of the snake in the food web?

A. Decomposer

B.Secondary consumer

C.Primary consumer

D.Producer

Answer:

B.Secondary consumer

Explanation:

A food web is a natural relationship in a food chain among organisms in an ecological community.

A secondary consumer in this system has to do with organisms that eat primary consumers, which means that they consume another animal or organism without producing.

Therefore, in a food web illustrates a snake eating a rat, the role of the snake in the food web is secondary consumer.

A. Breaking Bread, because you can rip or cut it and it is still bread.

hope that helps :)

Answer:

a

Explanation:

Answer is: A The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases.  

1) For example, the half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

2) Another example, half-life is the time required for a quantity to reduce to half its initial value.

Initial mass of sample: 30 grams.

After first half-life (60 days): 50% · 30 g ÷ 100% = 15 g.

After second half-life (120 days): 0.5 · 15 g = 7.5 g.

Elephant toothpaste is the term given to a chemical reaction that results in a large amount of foam, similar visually to toothpaste squeezed from a tube. It is not to be confused with actual toothpaste, which is a product used for oral hygiene containing abrasives, flavorants, and fluoride.

Elephant toothpaste is a name commonly given to the chemical reaction that produces a large quantity of foam, reminiscent of toothpaste being squeezed out of a tube. It is not actual toothpaste and should not be used for oral hygiene. Instead, the name is a playful term referring to the visual similarity between the rapid foamy output and an imagined amount of toothpaste that would be suitable for an elephant.

On the other hand, actual toothpaste is a paste or gel used with a toothbrush to clean and maintain oral health. It contains abrasives to aid in plaque removal, flavorants like peppermint, and fluoride to prevent cavities. Various forms of fluoride, like sodium fluoride and stannous fluoride, are used in toothpastes. It's important to note that only actual toothpaste should be used for oral hygiene, not fun chemistry experiments like elephant toothpaste.

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Answer:- 44.01 gram per mol.

Solution:- Mass of one mole means the formula mass of the compound. Carbon dioxide has one carbon and two oxygens.

So, formula mass of carbon dioxide = atomic mass of C + 2(atomic mass of O)

Atomic mass of carbon is 12.01 and atomic mass of O is 16.00. So, formula mass of carbon dioxide = 12.01+2(16.00)

= 12.01+32.00

= 44.01

So, the mass of one mole of carbon dioxide is 44.01.