A drought is best defined as
Which material is the lest likely to be recognized as a mixture by looking at it under a microscope ?
A . Suspension
B . A colloid
C . A homogeneous mixture
D . A heterogeneous mixture .
The _____ along a gene specifies the type of protein that will be produced.
A.order of RNA bases
B.number of DNA bases
C.order of DNA bases
D.number of RNA bases
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what is the definition of chemistry
the branch of natural science which deals with the study of matter properties constituent particle at a molecule its structure effect energy is called chemistry
chemistry is mainly concerned with the study of structure of matter composition property along with the method of transformation of one form of matter into another us anything which has mass occupies space is matter therefore chemistry is related with Whole Universe it is not only restricted to laboratory but is also related with the process occurring within around us it is in one of the Other form related with micro bacteria ripening of food it is etc
Question: A boy swimming in a lake smacks the surface of the water with his hand, creating sound waves that travel through the water and air. Which will hear the sound sooner, a fish swimming 5 m below the surface of the water, or a bird flying 5 m above the surface of the water? Justify your answer by discussing how sound travels through a medium.
Sound waves are the waves generated from the sound source and are composed of rarefactions and compressions, they are of longitudinal, pressure and mechanical wave types.
A fish swimming 5 m below the surface of the water will hear the sound first.
What are the characteristics of the sound waves?A sound travels in a medium depending upon the amplitude, time period, frequency, velocity and wavelength.
A sound wave travels faster in the water as the particles are closely packed compared to the air and the water is denser as compared to the air.
The particles in the air are loosely and distantly placed making them less dense and hence the sound travels slower in the air.
Therefore, fish will hear the sound first.
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The energy driving a windmill each minute equals 2.75 kilojoules. If 1.6 kilojoules of energy is given up by the windmill as thermal energy from friction and electrical resistance, how many kilojoules of energy are provided as electricity to the power line?
A mixture made of two or more elements, at least one of which is a metal, is called a(n)
A mixture made of two or more elements, at least one of which is a metal, is called an alloy.
Alloy is defined as a mixture of metallic phases or mixture of chemical elements in which one element must be a metal. For the formation of alloys two or more elements are mixed, on of which is essentially a metal. The other constituent in an alloy may or may not be metal.
Since the beginning of time, some people have believed that the Earth is flat. Beginning around 300 B.C., however, some began to wonder if the Earth is actually spherical in shape. Those that favored the flat Earth theory made the following observations: The Earth is stable because it is a flat landmass sandwiched between a flat layer of air and a flat layer of water. If the Earth is spherical, then oceans should be curved on top, but they aren't. Some rivers flow for hundreds of miles but only fall a few feet. The rivers should fall farther if the Earth is spherical. If the Earth is spherical, people and animals that inhabit the Earth would notice as they walked along its surface. Since mariners are able to use flat compasses to navigate their ships without crashing, the Earth must not be a sphere. Those that disputed the flat Earth theory countered the claim by observing that Christopher Columbus was able to sail around the Earth without falling off the edge and later, by presenting satellite imagery taken from space of a spherical Earth. This example demonstrates that
Answer:
argumentation is a necessary part of scientific inquiry.
Explanation:
Answer:
argumentation is a necessary part of scientific inquiry.
Explanation:
Bees and flowers both belong to the domain Eukarya. Using this information, how are bees and flowers similar?
Both must belong to the same kingdom as well.
Both are made of cells that contain a nucleus.
Both are made of cells without any membranes.
Both are some of the oldest types of organisms found on Earth.
40 points
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I think it would be both must belong to the same kingdom???
Identify the oxidizing agent in the reaction
SnO2(s)+2C(s)→∆ Sn(l)+2CO(g),
the production of metallic tin from tin(IV)
The oxidizing agent in the reaction is C and the reducing agent is SNO₂.
What are oxidizing and reducing agents?Oxidizing agents are the agents that accept electrons and act as oxidizing agents and do the process of oxidation. An example is hydrogen gas.
The reducing agent is the agent that reduces the reaction or does the process of reduction. Some compounds are reducing agents.
The given chemical reaction is
SnO₂(s)+2C(s)→∆ Sn(l)+2CO(g)
The reaction shows the production of metallic tin from tin IV. IN the given reaction, the reducing agent is the tin, because it does the process of reduction.
Here, the oxidizing agent is the carbon, C which reacts with the oxygen of the reaction and does the process of oxidation.
Therefore, the oxidizing and the reducing agent are C and SNO₂ respectively.
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When a green powder is heated,it turns black and gas is produced.Is this a reversible or irreversible change?Explain your answer.
Answer:
irreversible change
Explanation:
It is an irreversible process, since when the green powder is heated and turns black, producing a gas, new chemical compounds are formed. A similar example is the reaction to the decomposition of copper carbonate, which is heated to produce carbon dioxide. The reaction is as follows:
CuCO3 (g) → CO2 (g) + CuO (s)
Kevlar is a synthetic polymer that was marketed for the first time in 1971. It is difficult to cut and does not shrink when exposed to cold temperature. It will not rust or corrode, and it can be immersed in water without being affected. Kevlar has low chemical reactivity and is an insulator. It is flame resistant and will not melt or soften at high temperatures. How could this negatively affect society? A) It will not chemically react to acid rain like many other materials. B) Tire companies will not sell as many tires since they would not fail as easily. C) It would be more difficult and costly to dispose since it does not naturally break down easily. D) Bullets will no longer be able to penetrate materials made of Kevlar as easily as other materials.
Answer:
The correct option is C
Explanation:
The negative impact of kevlar in the society is that it can not just be disposed via conventional methods. It's resistance to flame and and high temperature means burning it will not dispose it. Also, its water resistant property means kevlar will obstruct drainages if thrown in the drainage - because when it piles up, water will not be able to pass through it hence obstructing the flow of water. It being difficult to cut, with its low reactivity and it's non-corrosive property means it will be very difficult and expensive to dispose
identify each material as a compound or a mixture. Caffeine contains hydrogen, carbon, nitrogen, and oxygen atoms in a fixed ratio.
Answer: it’s a compound
Explanation:
I just did it on edge
After the discovery of the microscope, many microorganisms were placed into taxonomic categories. What characteristic of science does this show?
It changes with common beliefs.
It changes with new evidence.
It is fixed, since it follows the scientific method.
It is fixed, since it is based on experimentation.
I need help this one:(( please help me
what are fragments of dust, soil, salt, smoke and ash upon which water vapor condenses to make clouds
This is science btw
Answer:
Particulate matter
Explanation:
The particulate matters are defined as the aerosol particles that are found to be present freely in the atmosphere. They are the mixture of dust, soil, salt, liquid drops, smoke and ashes. They can be formed both naturally and from the anthropogenic activities. These smaller particles present in the water vapor undergoes condensation, forming liquid and ice on the surfaces of dust particles present in the atmosphere. With more frequent condensation of water vapor, results in the formation of clouds.
what is being cycled??
¿Cuál es el volumen (en mL) necesario para diluir 100.0 mL de una solución de CaC2 5.00 M
para obtener una solución 0.750 M CaC2?
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Which best describes the importance of the microscope to the development of cell theory? Microscopes color different parts of cells so they can be seen with the naked eye. Cells are too small to see with the naked eye, and a microscope magnifies them. The lenses in a microscope reduce the image of an organism to the size of a cell. Microscopes trap “animalcules” from pond water so they can be studied.
Answer:The correct answer is B hope this helps
The compound, A2Z3, is a made-up compound. If this is an ionic compound, name two elements that A & Z may be?
How can we find the volume of this fish tank? Please I needed but Good
Find the number of 1-foot cubes that fill the fish tank
Explanation;Volume of a cuboid such as the fish tank is given by the product of length width and height;
Such that; Volume = length × width × height
Similarly, we can count the number of 1 foot cube that can fill the fish tank.
And since each cube has a volume of 1 cubic ft, then the number of cubes will be equivalent to the volume of the fish tank in cubic ft.
Answer:
The correct answer is find the number of 1 foot cubes that fill the fish tanks.
Explanation:
Volume is defined as amount of space occupied by an object.
Number of 1 foot cubes lying on the length of fish tank ,l= 5 feet
Number of 1 foot cubes lying on the width of fish tank,w = 3 feet
Number of 1 foot cubes lying on the height of fish tank ,h= 3 feet
Volume of the cuboid fish tank will be :
The volume of fish tanks id 45 cubic feet.
Explanation:
Suppose you were doing the experiment with a 50 mL syringe. How many mL would you pull the plunger for each reading?
Final answer:
The mL increment to pull the plunger for each reading depends on the experiment's needs; for a 50 mL syringe, one might use 5 mL or 10 mL increments for convenience and ease of measurement.
Explanation:
To answer the question regarding how many milliliters (mL) you would need to pull the plunger of a syringe for each reading, it's crucial to understand that this will depend on the specific requirements of the experiment or what the experiment is aiming to measure. If no specific increments are given in the experiment details, a common approach is to pull the plunger in regular intervals that make sense for the total volume of the syringe and the level of precision required. For example, if you are using a 50 mL syringe, you might choose to pull the plunger 5 mL at a time to obtain ten readings for the full range, or 10 mL at a time for five readings, as these increments allow for relatively easy reading and measurement.
what is the standard notation of the isotope H-2
Describe the observations that might be seen when a metal reacts with an acid?
Acid is known to be a very strong type of liquid because of it destructive and can wipe almost wipe everything. When it reacts with specific objects, gas is produced. When a metal is poured with acids, it reacts. Salt and hydrogen gas will be produced. Putting an ignited splint in the produced gas when an acid reacts with metal, it fired with a creaky sound, because of the hydrogen produced.
1. Aqueous solutions of chromium(III) iodide and sodium hydroxide react to give a chromium(III) hydroxide precipitate and aqueous sodium iodide.
2. Aqueous solutions of iron(II) sulfate and barium nitrate react to give a barium sulfate precipitate and aqueous iron(II) nitrate.
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if there is no reaction.
For reaction 1, the balanced equation is CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq). For reaction 2, it is FeSO4(aq) + Ba(NO3)2(aq) → BaSO4(s) + Fe(NO3)2(aq). The products Cr(OH)3(s) and BaSO4(s) form precipitates in their reactions.
Explanation:Based on your questions, we can establish the following balanced chemical equations:
The synthesis of chromium(III) hydroxide from chromium(III) iodide and sodium hydroxide:CrI3(aq) + 3NaOH(aq) → Cr(OH)3(s) + 3NaI(aq).The synthesis of barium sulfate from iron(II) sulfate and barium nitrate:FeSO4(aq) + Ba(NO3)2(aq) → BaSO4(s) + Fe(NO3)2(aq).This shows the precipitation reactions that can occur between certain metallic ions in solution. The precipitates are the insoluble products - chromium(III) hydroxide and barium sulfate, respectively.
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Which of the following can be used to find the identity of an unknown organism?
Branching tree
Derived shared characteristic
Cladogram
Taxonomic key
3. Discuss the difference between molarity and molality, state the units of each, state the symbol for each, and give an example of how each can be used when you are determining the concentration of a solution.
Molality(m) or molal concentration is a measure of concentration and it refers to amount of substance in a specified amount of mass of the solvent. Used unit for molality is mol/kg which is also sometimes denoted as 1 molal. It is equal to the moles of solute (the substance being dissolved) divided by the kilograms of solvent (the substance used to dissolve).
Molarity(M) or molar concentration is also a measure of concentration and represents the amount of substance per unit volume of solution(number of moles per litre of solution. Used unit for molarity is mol/L or M. A solution with a concentration of 1 mol/L is equivalent to 1 molar (1 M).
Molality is preferred when the temperature of the solution varies, because it does not depend on temperature, (neither number of moles of solute nor mass of solvent will be affected by changes of temperature), while molarity changes as temperature changes(volume of solution changes as temperature changes).
Final answer:
Molarity is the number of moles of solute per liter of solution, denoted as 'M', while molality is the number of moles of solute per kilogram of solvent, denoted as 'm'. Molarity is used for reactions where volume changes are insignificant, and molality where temperature changes are considered.
Explanation:
Difference Between Molarity and Molality
The difference between molarity and molality involves how they calculate concentration, the units used, and their symbols. Both are methods to express the amount of solute in a solution and are used to determine quantities in chemical reactions.
Molarity (M)
Molarity is the number of moles of a solute dissolved per liter of solution. It is a very useful measurement for evaluating the concentration of solutions, especially in discussions involving chemical reactions where a solute is a product or a reactant. The unit for molarity is moles per liter (mol/L), and its symbol is 'M'. For example, if we have a solution with 1 mole of sodium chloride in 1 liter of water, the molarity would be 1 M, useful in determining the resulting concentration of a diluted solution.
Molality (m)
Molality, on the other hand, is the number of moles of solute per kilogram of solvent. Unlike molarity, molality does not change with temperature since mass does not change with temperature. The unit for molality is moles per kilogram (mol/kg), and its symbol is 'm'. For example, if there are 2 moles of glucose dissolved in 1 kilogram of water, the molality of the solution would be 2 m, important when temperature changes affect the experiment.
Sex-linked disorders occur more frequently in males than females because males have two X chromosomes and females have two Y chromosomes. is this true or false?
Which statement best summarize the relationship between the muscular system and the cardiovascular system?
A. The heart is protected from injury by the breastbone.
B. Nutrients are carried to the heart through arteries and veins
C. Messages are carried by nerves between the brain and the heart.
D. The heart contract and expands as it pumps blood through the body
And how do I explain that I know the answer???
Final answer:
The muscular system and the cardiovascular system are closely related. The heart, a key component of the cardiovascular system, is a muscular organ that pumps blood. Nutrients and other substances are transported throughout the body by arteries and veins.
Explanation:
The relationship between the muscular system and the cardiovascular system can be summarized as follows:
The heart is a muscular organ that contracts and expands as it pumps blood through the body. It is the central component of the cardiovascular system.
Nutrients, oxygen, hormones, and other substances are carried to the heart and throughout the body by arteries and veins, which are part of the cardiovascular system.