Answer:A compound is a combination or two or more elements held together by chemical bonds. Compounds can only be separated by chemical processes. Since chemicals are composed of different elements, determining the ratio between the elements can allow you to analyze how much of each compound is present. Such a process is also useful for analyzing chemical reactions that are being performed in chemistry experiments. Making connections between units and how elements combine to form compounds can help you to better understand their ratios.Hydrogen peroxide,H2 O2. There are 2 moles of hydrogen and 2 moles of oxygen giving us a ratio of 2:2. We can reduce this ratio by dividing both numbers by a factor of both of them.
What types of matter
can be classified as pure
substances?
Answer:
Pure substances can be classified as chemical compounds or elements.
How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
A. it shows that no atoms have been gained or lost during the reaction
B .it shows that only physical changes follow the Law of Conservation of Mass
C. it shows that all compounds remain bonded after the reaction
D. it shows that the properties of the elements stay the same after the reaction
PLEASE HELP ME , 20 pts for whoever!
Answer:
it shows that no atom have been gained or loosed in that reaction
For most of the first 1,800 years in the common era, most people, including scholars, did not believe in sexual or asexual reproduction for many organisms. They thought many creatures, including frogs and mice, came from nonliving things. This was the theory of spontaneous generation. For example, maggots were believed to simply appear in meat as it spoiled. Today we know that maggots come from eggs that were laid on or in the meat by their mothers.
Louis Pasteur proved that living organisms do not just appear. Broth that is left sitting out for a while will grow cloudy as small organisms live and grow in it. Louis Pasteur boiled broth and let it cool without coming into contact with any "particles" in the air. Broth treated that way did not grow cloudy.
Louis Pasteur's experiment showed that small organisms that live in broth do not come from the broth itself. Which of the following best describes this statement and how it changed what scientists know?
A.
It is a scientific theory of how life begins that fits the facts better than spontaneous generation.
B.
It is a scientific observation that goes against the theory of spontaneous generation, so the theory must be wrong.
C.
It is a set of detailed observations of how single-celled organisms live and reproduce.
D.
It is a result that was predicted by the theory of sexual reproduction, proving that theory to be correct.
Answer:
the answer is option b
Explanation:
he conducted an experiment and the observation was against what the theory had said
The statement best described in the passage is: It is a scientific observation that goes against the theory of spontaneous generation, so the theory must be wrong. Option B is correct.
The passage describes Louis Pasteur's experiment, which refuted the prevailing theory of spontaneous generation. The theory of spontaneous generation suggested that certain organisms could arise from nonliving matter, such as maggots spontaneously appearing in spoiled meat.
However, Louis Pasteur's experiment demonstrated that living organisms do not simply appear but come from pre-existing living organisms. By showing that broth treated in a specific way did not grow cloudy with small organisms, Pasteur provided evidence against spontaneous generation, leading to the rejection of that theory.
This scientific observation changed what scientists know by disproving the long-held belief in spontaneous generation and providing evidence to support the idea of biogenesis, where living organisms arise from other living organisms. This experiment laid the foundation for our modern understanding of the origin of life and the importance of studying the role of microorganisms in various biological processes.
Hence, B. is the correct option.
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Which organisms use cellular respiration as a way to convert energy into usable form?
seedless plants only
only photosynthetic organisms
only mammals
all organisms
I'm sorry I meant all organisms
Write a balanced molecular equation describing each of the following chemical reactions:
Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas.
Answer: CaCO3 = CaO + CO2
Explanation:
CaCO3 = CaO + CO2
This is balanced already.
Elem Reactant Products
Ca 1 1
C 1 1
O 3 3
Write the empirical formula of at least four binary iconic compounds that could be formed from the following ions:
Zn^2+,Fe^2+,I^-, S^2-
Explanation:
ExplainExplainexplainExplainexplainexplainExplainexplainexplainexplainExplainexplainexplainexplainexplaincompare the temperature and thermal energy of hot soup in a small mug and that of hot soup in a large bowl
Explanation:
Both have the same temperature, but the large bowl of soup has more thermal energy than the small mug because there is more matter present in the bowl.
The temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
What is thermal energy?Thermal energy is defined as the energy of an object or system due to the movement of its molecules and atoms. It is produced with rise in temperature.
It is also defined as internal energy present in a system in the state of thermodynamic equilibrium by virtue of its temperature.
Thermal energy is also known as heat energy.
Thermal energy is directly proportional to mass of the object.
Thermal energy sources include natural gas, coal, and oil, as well as solar, heat pump electric, and geothermal heat.
Thus, the temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
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for the substituted cyclohexane compound shown, identify the atoms that are trans to the bromo substituent.
Substituents are trans to each other if the appear on opposite sides in the structure. C, E, G, H and K are trans to the bromo substituent.
The substituted cyclohexane compound is shown in the image attached. Two substituents in a compound are trans to each other if they appear on opposite sides of the structure. Cis substituents appear on the same side of the structure.
Considering the structure as shown in the image attached, the substituents that are trans to the bromo substituent are the substituents shown as letters C, E, G, H and K. They lie opposite to the bromo substituent.
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Answer: H , G , E , K, C
Explanation:
These are all opposite from Bromine, meaning they do not face the same way. Bromine faces upward (axial) while the rest of these face downward, (equatorial) to Bromine. We are looking for this opposite facing options. A is not considered an opposite facing option even though it at least looks opposite to Bromine only because it is connected directly to Bromine, making it neither the same or opposite to Bromine.
SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He brought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day.
What did SpongeBob do wrong in this experiment? Explain.
How could SpongeBob improve his experiment?
Answer: He had more than one independent variable.
Explanation: It would only be fair, if both plants were in a sunny window, because then, it would be easier to see if the fertilizer actually affected the plants. This is because there is always a chance that the lack of sunlight decreased the number of flowers on the plant, instead of the fertilizer. It is always better to just have one independent variable.
Why do you have to have a certain number of reactants on one side?
Answer:Because you need that certain number and double the number of bread to get the reactants off of the sides
Explanation: 4 bread reactants- 2meat reactants- 2 cheese reactants= 2 products
The reason for the presence of a certain number of reactants on one side is to ensure that the chemical equation is balanced.
In a balanced chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of that element on the product side.
Consider the equation:
[tex]2H_2 + O_2 - > 2H_2O.[/tex]
This equation represents the reaction of hydrogen gas ([tex]H_2[/tex]) with oxygen gas ([tex]O_2[/tex]) to form water ([tex]H_2O[/tex]).
To balance this equation, double the coefficient in front of [tex]H_2O[/tex] on the product side, resulting in 4 hydrogen atoms and 2 oxygen atoms on both sides.
Therefore, having a certain number of reactants on one side is necessary to ensure that a chemical equation is balanced, satisfying the law of conservation of mass.
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explain why copper metal cannot be used to prepare hydrogen gas
Suppose you wanted to use a graphical method to find the number of miles your car can travel on a
gallon of gasoline. Briefly describe a procedure you could use.
someone pls answer asap i don’t care if the answer isn’t that good i’ll give lots of points
Answer:
I think its use a Acceleration to speed up
NEED HELP ASAP!!!!!!!!!!!!!!!!
The orbital diagram below is written incorrectly. Why?
A
The orbitals are not in the correct sequence.
B
The orbital diagram violates Hund's rule.
C
The electrons are all paired.
Answer:
The answer to your question is: letter B
Explanation:
Hund's rule: states that electrons always enter an empty orbital before they pair up.
In this exercise, we notice that orbital p has three suborbitals, then,
we must start filling each suborbitals with one electrons and after that we start to pairing them up.
The result must be,
1st suborbital with 2 electrons
2nd suborbital with 1 electron
3 rd suborbital with 1 electron
B. is the correct answer
Explain how a true acid wave, with a pH below 7.0, can cause the hair to swell.
Answer:
Services raise the pH in the hair to a alkaline state in order to soften and swell the hair shaft. Disulfide, hydrogen, salt. Side bonds are responsible for the strength and elasticity of the hair. Altering these is what make wet setting, thermal styling, permanent waving, curl reforming, and relaxing possible
A pH of 7 is neutral, a pH below 7 is acidic, and pH above 7 is alkaline. ... Chemical Texturizers raise the pH of the hair to an alkaline state in order to soften and swell the hair shaft. This action lifts the cuticle layer, and allows the solution to reach the cortex layer where restructuring takes place.
Explanation:
6. Model conservation of mass in a labeled drawing that illustrates a physical change.
Answer:
hope it's help you
Explanation:
In an isolated system, neither chemical processes nor physical changes can create or destroy mass, according to the principle of mass conservation. According to the law of conservation of mass, the mass of the products and reactants of a chemical reaction must be equal.
Why is mass conservation crucial?According to the law of conservation of mass, matter cannot be created or destroyed in a chemical reaction. When wood burns, for example, the mass of the soot, ashes, and gases equals the original mass of the charcoal and oxygen when it first reacted. As a result, the product's mass equals the reactant's mass. The understanding that substances do not, contrary to appearances, vanish as a result of a reaction, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry. The law of conservation of mass does not always apply.To learn more about mass conservation refer to:
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write the properties of first group of element
Answer:
hydrogen
Explanation:
1
H
1
hydrogen
magnesium
determine the expected splitting pattern for the nmr proton signal corresponding to the red hydrogen in each structure.
Quartet is the expected splitting pattern for the NMR proton signal corresponding to the red hydrogen in each structure.
What are NMR protons?NMR protons are defined as the use of nuclear magnetic resonance in NMR spectroscopy to analyze the structure of a substance's molecules by focusing on hydrogen-1 nuclei within its molecules. A spectroscopic method known as proton nuclear magnetic resonance is frequently used to determine the structural.
Quartet is defined as a split signal with four closely spaced lines. The quartet results from linking three protons with equal coupling constants. The following splitting tree, which has been depicted as three successive drawings, can be thought of as a quartet and is composed of a doublet of doublets of doublets with three equal splitting's.
Thus, quartet is the expected splitting pattern for the NMR proton signal corresponding to the red hydrogen in each structure.
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This is the stable structure on which the microscope firmly rest. *
Answer:
Explanation:
As far as the function of the microscope is concerned, they play the most important role. ... These are parts that support the microscope and the object being examined. Base. This is the stable structure on which the microscope firmly rests.
1. Which property measures the space taken up by an object?
A hardness
B mass
C. volume
D. weight
It refers to a group of cells which perform essentially the same function. *
Answer:
Tissue
Explanation:
A Group of cells which perform thesame function according to the organization of life is called Tissue
This is the question pls help me
Answer: B
Explanation: Graph B compares the two temperatures on separate lines so that we can see the comoparison directly, as a function of time. Not only does the graph quickly answer which condition id most favorable to colony growth, but it also hints at some behaviors that may accelerate growth as time goes on. Graph C is a possible answer, if the only question is which promotes growth the fastest. But the questions asks "compare," which Graph B does not allow as well as Graph C.
Someone pls tell me the cm and mm
Explanation:
Answer is 1 CM 3MM
AND YOU CAN ANSWER AS 1.3
1. How many grams of CuNO, are required to produce 700.0 mL of a 2.0 M CUNO,
solution?
a) 175 g
b) 87.7 g
c) 43.8 g
d) 117 g
e) 1.50 g
Answer:
b
Explanation:
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how many sodium atoms are present in 0.2310 g of sodium?
Answer:
There are 6.048X10^21 atoms present in 0.2310 g of sodium.
Explanation:
We know,
23g Na contains 6.022X10^23 atoms
∴1g Na contains 6.022X10^23/23 atoms
So, 0.2310g Na contains (6.022X10^23/23)X0.2310 atoms
= 6.048X10^21 atoms
There are 6.048X10^21 atoms present in 0.2310 g of sodium.
The number of atoms present in 0.231 g of sodium is 6.02 x 10²¹ atoms.
The given parameters;
mass of the reacting sodium = 0.231 g1 mole of an atom = 6.02 x 10²³ atomsthe atomic mass of sodium is 23 g/molThe number of moles of 0.231 g of sodium available is calculated as;
[tex]no. \ of \ moles = \frac{Reacting \ mass}{Molar \ mass} \\\\no. \ of \ moles = \frac{0.231}{23} \\\\no. \ of \ moles = 0.01 \ mol.[/tex]
The number of atoms of 0.01 mole of sodium available is calculated as;
1 mole ---------- 6.02 x 10²³ atoms
0.01 ----------------- ?
= 0.01 x 6.02 x 10²³ atoms
= 6.02 x 10²¹ atoms.
Thus, the number of atoms present in 0.231 g of sodium is 6.02 x 10²¹ atoms.
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Tổng số hạt p,n,e của hai nguyên tử A và B là 142. Số hạt mang điện nhiều hơn hạt không mang điện là 42, số hạt mang điện của B nhiều hơn A là 12. Tính số p,n,e của mỗi nguyên tử A và B
Answer:
language
Explanation:
how does the path of the moon in the sky vary throughout the year
Answer: your answer
Explanation: The Moon follows generally the same path, but with some important differences. The Moon's orbit is tilted 5.1° relative to the ecliptic. So, the Moon can appear anywhere in a band extending 5.1° north (above) and south (below) of the ecliptic. Each month, the Moon twice crosses the ecliptic on opposite sides of Earth
How many of each type of atom would there be if this water molecule underwent electrolysis?
There would be two atoms of hydrogen and one atom of oxygen. Electrolysis involves decomposition of substances by direct current.
Electrolysis is a process by which a liquid is decomposed by the passage of direct current through it.
Water is composed of hydrogen and oxygen in a ratio of 2:1. Hence, when water molecule is decomposed in electrolysis, two atoms of hydrogen and one atom of oxygen is obtained.
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When burning a campfire, how would the mass of the products of burning (ash, soot, etc.) compare to the mass of the wood and oxygen that were used during the burning?
A
the masses would be different
B
the masses would be the same
Answer:
A because this different
Answer:
B
Explanation:
the masses would be equal to the burning (ash, soot, etc.) to the wood and oxygen that were used during the burning since the law of conservation of mass says that matter can not be destroyed nor created.
PLEAse HELP MEEEE ASAPPP
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H20m - 2KOH(aq) + H2(g)- Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
Answer:
Chemical Reaction:In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction. A redox reaction is a reaction in which a substance is oxidized during the reaction whereas some other substance is reduced during the reaction, simultaneously.
Explanation:
correct me nlng kung mali.
An investigation involves determining which metal is better for making pots that will cook food faster
Answer:
Good luck on the investigation? What is the question lol
Answer:
Pots made of copper are better than those made of iron. Copper is malleable and heats up much faster than iron. Copper will heat up faster than iron if it is a better conductor.
Explanation:
Copper is the best heat conductor of any material used to make cookware. It heats rapidly and evenly and cools down as soon as it's removed from the heat, giving you maximum control over the application of heat.