Answer:
1) Nitrogen
2)Oxygen
3)Argon
Explanation:
Nitrogen has 78.1 % gasses
Oxygen has 20.9 % gasses
Argon has 0.93 % gasses
a chemical combination of two or more elements joined together in a fixed proportion
Answer: a compound!
Explanation: a compound is something that contains two or more elements that are chemically combined in a fixed proportion!
100 POINTS!! HELP ASAP
Answer:
Decreased amounts of carbon dioxide cause reactions to happen in the water that increase the pH and decrease the
amount of calcium carbonate
Explanation:
When carbon dioxide is absorbed by seawater, chemical reactions occur that reduce seawater pH, carbonate ion concentration, and saturation states of biologically important calcium carbonate minerals. These chemical reactions are termed "ocean acidification" or "OA" for short.
Answer: Its C I did my research and that's what makes sense to me. because increased amount of carbon dioxide decreases the PH and the amount of calcium carbonate.
Why is downward displacement of water
unsuitable for collecting a gas that dissolves in
water?
Answer:
Answer Down below
Explanation:
Question answered: Why is downward displacement of water unsuitable for collecting a gas that dissolves in water?
: The reason why downward displacement of water unsuitable is bc downward displacement of water as it is less denser than water. meaning it comes out of the surface water, that means it is insoluble in water so it does not dissolve in water.
Hope this helps
~~Wdfads~~
a 100.00 ml of volume of 0.500 m hcl was mixed with 100.00 ml of 0.500 m koh in a constant pressure calorimeter. the initial temperature of individual acid and base was 23.0 oc. the final temperature after mixing was 25.5 oc. the specific heat of the solution was 3.97 j g-1 oc-1 assume the density of the solution is 1.00 g ml-1 a) calculate the heat of the reaction in kj. (be sure to use signs correctly.) b) calculate the enthalpy of the reaction in kj/mol. (be sure to use signs correctly.)
Answer: 2.018
Explanation:a 100.00 ml of volume of 0.500 m hcl was mixed with 100.00 ml of 0.500 m koh in a constant pressure calorimeter. the initial temperature of individual acid and base was 23.0 oc. the final temperature after mixing was 25.5 oc. the specific heat of the solution was 3.97 j g-1 oc-1 assume the density of the solution is 1.00 g ml-1 a)
what are some importance of density?
Answer:
allows us to determine what substances will float and what substances will sink when placed in a liquid
Explanation:
Generally, substances float so long as their density is less than the density of the liquid they are placed in.
Alkali metals are highly since they easily to form ion
It is a true statement that the alkali metals are highly reactive because they do form ions very easily.
What are alkali metals?The alkali metals are the elements tat are found in group one. The elements in the group do not occur free in nature because they easily combine with other elements in such a way that they form compounds. This is why they have a very negative values of electrode potential. The electrode potential has to do with the ease with which an electron can be lost from a metal as manifested in the degree of negativity of the value of the electrode potential of the particular element that is under consideration.
Recall that the elements that have a very negative value of electrode potential does form an ion easily and as such they can loose or eliminate the outermost single valence electron very much easily compared to the other elements.
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Missing parts;
Alkali metals are highly reactive since they easily form an ion.
True/false
Which of the following actions describes deposition?
breaking rock into smaller pieces
dropping sediment in one location, where it builds up
moving rock from one location to another
flowing soil or mud due to gravity
The following actions describe deposition as flowing soil or mud due to gravity. Option D.
Sedimentation is the accumulation of sediments carried by the wind running water sea or ice. Sediments are carried as pebbles sand mud, or dissolved salts in water. A deposition is the direct transition of a substance from the gaseous state to the solid state on cooling without going through the liquid state.
Sedimentation is the geological process in which sediments soils and rocks are added to form landforms or land masses. Wind ice water and gravity cause previously weathered surface material to deposit and lose sufficient kinetic energy within the fluid to form a layer of sediment. Several factors influence how sediment settles. Sediment is removed from new surface locations. Precipitation is the change of state of a gaseous substance into a solid.
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Which option describes a benefit of rotating crops?
Responses
maintains nutrient levels in soil
helps irrigate the crops
prevents weed from growing in the crops
makes the soil more organic
Crop rotation is the technique of planting crops in a different area of the garden so that no single crop will be planted in the same place two—or more—years in a row.
Crop rotation aids in preserving the structure and nutrient content of the soil as well as helping to keep pests that are carried by the soil from colonizing the garden.
As the same nutrients are repeatedly consumed when a single crop is planted in the same location each year, the soil structure slowly deteriorates. After a while, the soil loses those particular nutrients and becomes unhealthy. At the same time, insect pests that feed on a single crop and spend their larval stage in the soil multiply as long as their food supply is still present. As their number grows, these pests get harder to control every year.
There are four key benefits of crop rotation: (1) Plants that fix nitrogen, like legumes and peas, enhance the quality of the soil for subsequent vegetable plantings in the same bed. (2) Plants with shallow and deep roots alternately extracted nutrients from the soil at various depths. (3) Because their food source is not in the same place each year, soilborne pests that feed on a particular plant family are inhibited. (4) Farmers and gardeners that use crop rotation don't have to leave their fields or beds fallow as frequently as they might otherwise.
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4. Conclude Coach Reuter puts you in charge of making sure the soccer
balls are at the right pressure for the big away game tomorrow. She thinks
checking them now might save you some time in the morning. Make a
recommendation about when you would check the pressure. Explain your
reasoning.
The right way to check the pressure of the soccer balls is via an air pressure gauge.
What is an air pressure gauge?
A device used to gauge the pressure that air or other comparable gases exert is known as an air pressure gauge.
As per the question, the air pressure gauge is based on Hook’s law. Hook’s law which states that the force needed to expand or compress a spring scales linearly concerning the distance of extension or compression, serves as the foundation for the operation of pressure gauges. Both internal and external pressure exists.
Consequently, when pressure is applied to an object's surface and the pressure is measured in this way.
Hence, the air pressure gauge is used.
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Identify what kind of cell or cells Andrea and Kamar are examining. Then, describe what is happening to the cell or cells.
Cell or cells Andrea and Kamar are examining is plant cell
Cells are building blocks of the living thing
Andrea and kamar are examining is plant cell and when plant entre in cytokinesis a cell plate has form between the two daughter cell because unlike plant cell and which are squishy and they can't just pinch at the middle and separate into two daughter cells and after all organelles are distributed equally among two daughter cell and new cell wall form around cell plate separating the two daughter cells
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Identify the product(s) in the following reaction:
Zn+2HCl → ZnCl₂ + H₂
Answer:
ZnCl2 + H2
Zinc (II) Chloride + Hydrogen gas
Susana heats up a sample of red crystals. While the sample is being heated, a gas is released and a blue powder is left after the heating. Is the sample of red crystals an element or a compound? Explain your answer.
The sample of red crystals is a compound as the elements cannot be broken down further by physical or chemical change.
What is a compound ?Compound is defined as a chemical substance which is made up of identical molecules containing atoms from more than one type of chemical element.
Molecules which consists of atoms of only one element are not called compounds.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding which are present in them.They are:
1)Molecular compounds where in the atoms are joined by covalent bonds.
2) ionic compounds where in the atoms are joined by ionic bond.
3)Inter-metallic compounds where in the atoms are held by metallic bonds
4) co-ordination complexes where in the atoms are held by co-ordinate bonds.
They have a unique chemical structure which is held together by chemical bonds. Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Answer:
Elements cannot be broken down into simpler substances.
Compounds can be broken down into simpler substances.
Explanation:
After drying an organic solution, what methods can be used to remove the drying agent from solution?.
After drying an organic solution, the method that can be used to remove the drying agent from the solution is option A. Vacuum or gravity filtration.
If the drying agent is of large particle size (as when using sodium sulfate or calcium chloride), decanting is the method of preference. An opportunity to decant is removing the liquid from the drying agent truly with the aid of drawing it off with a Pasteur pipet.
Unusual drying agents are anhydrous inorganic salts that gather waters of hydration while exposed to moist air or wet answer. For the maximum not unusual drying dealers which include sodium sulfate or magnesium sulfate, the crystals form large clumps once they take in water.
A desiccant is a hygroscopic substance that is used to induce or preserve a kingdom of dryness in its vicinity; it is the opposite of a humectant. generally encountered pre-packaged desiccants are solids that take in water.
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Disclaimer:- your question is incomplete, please see below for the complete question.
After drying an organic solution, what methods can be used to remove the drying agent from the solution?
a. Vacuum or gravity filtration.
b. A wash in a separatory
c. Decanting
d. Distillation
(20) SEP Engage in Argument Of all the noble gases, helium and neon, are completely
inert, as they do not form any chemical compounds. However, some of the heavier
noble gases, such as Kr, Xe, and Rn, are capable of forming a few chemical
compounds. Using periodic properties and electron configurations, explain how
this can occur moving down this group of elements.
Answer:
As you move down the periodic table, atomic radii increase (more shells in the electron configuration), and the first ionization energy decreases. Electrons of the outermost shell of the atom are further away, and their attraction to the nucleus, therefore, decreases, making it easier for elements with high electronegativity such as Fluorine to form compounds with them.
Perform the following operation
and express the answer in
scientific notation.
(7.296 × 10²) = (3.6 × 10-⁹)
[?]
? ] × 10°
After perform the following operation and express the answer in scientific notation is 7.6×10¹⁰
What is scientific notation?
Scientific notation is a way to present extremely large or extremely small numbers in a more understandable way. We are aware that full numbers can go on forever, but we are unable to write such enormous figures on paper. Additionally, a simpler method of representation was required for the numbers that appear at the millions place after the decimal. This makes it challenging to represent a small number of integers in their enlarged form. We therefore employ scientific notations. Learn general form for numbers as well. In scientific notation, 100000000 can be written as 108, for instance. Exponent is positive in this case. Similar to 0.0000001, which has a negative exponent and is a very small number, 10-8 can be used to symbolise it.
=7.296×10²÷9.6×10⁻⁹
=7.296×10²/9.6×10⁻⁹
=0.76×10¹¹
=7.6×10¹⁰
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When a solution of ammonium carbonate and magnesium chloride are mixed, what precipitate if any is formed?.
When a solution of ammonium carbonate and magnesium chloride are mixed, the precipitate formed is ammonium chloride.
What is precipitation reaction?A precipitation reaction is any reversible reaction in which a product is continuously removed by precipitation, driving the reaction in one direction.
The precipitate is a substance that separates out of a liquid solution into solid form.
According to this question, when a solution of ammonium carbonate and magnesium chloride are mixed, ammonium chloride and magnesium carbonate are formed as follows:
2(NH₄)₂CO₃ + 2MgCl₂ → 4NH₄Cl + Mg₂(CO₃)₂
Based on the chemical equation above, it can be observed that ammonium chloride will be the precipitate.
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Milk has a pH of about 6.7 is milk acidic or basic use figure 8-3 to answer this question
O Acidic
O Basic
O Neutral
Explanation:
Hi, I think the answer's C- neutral cuz 6.7 is approximately 7, and seven is neutral so....
C
hope this helps
While reading through a strange textbook on alien currency, you encounter the following word problem:
You are on an alien planet where the names for substances and the units of measures are very unfamiliar.
Nonetheless, you obtain 13 quibs of a substance called skvarnick.
You can trade this skvarnick for gold coins, but the vendors all measure skvarnick in units of sleps; not quibs.
5 quibs is equal to 7 sleps.
If you have 13 quibs of skvarnick, how many sleps do you have?
Based on the word problem above, what conversion factor are you given?
Question 3 options:
A.quibs
B.5 quibs = 7 sleps
C.7 sleps
D.13 quibs
E.5 quibs
F.sleps
Number of sleps we have is 7 sleps. Option B.
A conversion factor is a number used to convert one set of units to another set by multiplication or division. If the conversion is required, the values should be equal using the appropriate conversion factor. For example, when converting inches to feet, the equivalent conversion value is 12 inches or 1 foot.
The conversion factor is a fraction equal to multiplying a quantity by a conversion factor that changes the units in which the quantity is measured but does not change the original quantity of the quantity. The conversion factor is equal to 1 because it consists of an equal sign. To find the conversion factor using squares square on both sides of the conversion factor. To find the transforming factor that includes the dice cube on both sides of the transforming factor.
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mention a metal which forms insoluble trioxocarbonate[vi] which decomposes to form an oxide of the metal
Aluminum is a metal which forms insoluble trioxocarbonate[vi] which decomposes to form an oxide of the metal.
What are metals?A metal is described as a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically ductile and malleable.
The properties a metal displays is as the result of the metallic bond between the atoms or molecules of the metal.
The properties of metals include the following:
A metal is mostly a hard solid substance that has a shiny luster and conducts heat and electricity. Metals are also good conductors of heat and electricity.Metals also possess malleability, that is they can be hammered into sheets.Learn more about metals at: https://brainly.com/question/89259
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7. The different colors of the visible light spectrum coalesce to make white
light. What is the best synonym (similar meaning) for "coalesce?"
O Divide
O Separate
O Combine
O End up
what is the change in internal energy (in j) of a system that absorbs 0.335 kj of heat from its surroundings and has 0.966 kcal of work done on it? give your answer in scientific notation.
The change in the internal energy is 4.395 kj
What is internal energy?
Rising temperature and changes in state as well as phase from solid state to liquid as well as liquid to gas cause an increase in internal energy. Planetary bodies could be viewed as a fusion of heat engines and heat reservoirs. Internal energy E is stored in the heat reservoirs, and some of it is converted into different kinds of mechanical, electrical, and chemical energies by the heat engines. The sum of the kinetic energy brought on by the molecule's movement and the potential energy brought on by the vibrational motion as well as electric energy of atoms inside of molecules makes up the internal energy U of the a system or a body with clearly defined boundaries. The energy contained in every chemical bond is also referred to as internal energy.
Given;
Q = +0.335 kj
W = - 0.966 kcal = -966 cal = - 4.04kj
del E int = +0.355 - [-4.04]
= 4.395 > 0
{Increase in internal energy}
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Which Sl unit is most appropriate for measuring density
Answer:
g/cm^3
Explanation:
kg/m^3 is not most used for measuring density
A metal tank containing hydrogen gas has a pressure gauge that reads 575 psi . What is causing the pressure inside of the tank ?
Answer:
The hydrogen molecules colliding with the sides of the metal tank.
Explanation:
Gas pressure is caused by the force exerted by gas molecules when colliding with the surfaces of objects.
Which of the following describes the formation of an ionic bond?
Potassium (K) loses an electron and becomes positively charged. Chlorine gains an electron and becomes negatively charged. The two atoms become attracted to one another.
Potassium (K) gains an electron and becomes positively charged. Chlorine loses an electron and becomes negatively charged. The two atoms become attracted to one another.
Potassium (K) and chlorine share an electron.
The following describes the formation of an ionic bond is
Potassium (K) loses an electron and becomes positively charged. Chlorine gains an electron and becomes negatively charged.
Ionic bond forms by the transfer of valence electrons from an atom to another atom. The chlorine is electronegative atom and accept the electron while potassium atom loses an electron and then ionic attraction arises between the positively charged potassium atom and negatively charge chlorine atom and form KCl that is potassium chloride.
K⁺ + Cl⁻ -----> KCl
Thus, The following describes the formation of an ionic bond is
Potassium (K) loses an electron and becomes positively charged. Chlorine gains an electron and becomes negatively charged.
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Can someone check my answers plssss? (**)- means answer
1. The Earth only has climate change because of human activity.
True
False**
2. The Earth is currently experiencing _____.
An Ice Age**
A Carbon Cycle Age
A Thermal Phase Change
An Interglacial Age
3. TRICKY QUESTION: What in one thing that scientists DO NOT use to study climate change? Choose only ONE Answer.
Number of Living trees
Pollen in bogs/lakes
Tree Rings
Ice core samples**
4. Why were the humans able to develop agriculture at the beginning of the Holocene Period?
Woolly mammoth herds left behind large numbers of animal droppings for fertilizer.
The ice from the previous ice age melted and the climate was warmer.**
Cave Men developed metal working technology that helped them make plows.
Holocene period men were able to select cold loving plants as crops.
5. TRICKY QUESTION: Humans impact the environment and the climate on the Earth. There are daily activities that you do that can affect coral reefs in oceans far away. What should you NOT DO where you live to help protect them?
Use less energy.
Plant trees/forest.
Use more water.**
Thank you <3
1. The Earth only has climate change because human activity is TRUE.
2. The Earth is currently experiencing An Ice Age.
3. Ice core samples
4. The ice from the previous ice age melted and the climate was warmer.
5. Use more water.
Humans impact the physical environment in many ways including overpopulation pollution, burning of fossil fuels, and deforestation. Such changes are causing climate change soil erosion declining air quality and water unfit for drinking.
Pollution overfishing destructive fishing with dynamite and cyanide, collecting live corals for the aquarium market, mining corals for building materials, and climate warming are the many different things that humans do to coral reefs around the world every day. just a fraction of the damage. Climate change will lead to the Warming of the oceans causing heat stress that contributes to coral bleaching and infectious diseases.
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how many moles of aluminum are necessary to generate 4.88 moles of aluminum oxide, according to the following equation:
4Al+3O2→2Al2O3
9.76 mol moles of aluminum are necessary to generate 4.88 moles of aluminum oxide.
4.88 moles Al2O3 (4 moles Al / 2 moles Al2O3) = 9.76 moles Al
1 mol = 6.02214 ×[tex]10^{23}[/tex] particles
The mole is the amount of stuff in a system that includes the same number of atoms as there are in 0.012 kilogrammes of carbon 12; it is represented by the symbol "mol".
The Avogadro constant's numerical value is fixed to be precisely 6.022 141 29 1023 when it is expressed in the SI unit mol-1. The mole, symbol mol, is the SI unit of substance for an elementary entity that is specified, which may be an atom, molecule, ion, electron, any other particle, or a specified group of such particle.
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How do you find the cation and anion to an element
In order to find the cation and anion of an element, the valence electron of the element needs to be determined.
Valence Electrons
The valence electron of an element is the number of electrons in the outermost shell of the atom of the element.
For example, sodium is an element with the atomic number 11. The electron configuration of sodium is 2, 8, 1.
In other words, sodium atom has a single electron in their outermost shell. Thus, the valence number of electrons in a sodium atom is 1.
In order for a sodium atom to form an ion, the valence electron needs to be donated. Thus:
[tex]Na - e^- -- > Na^+[/tex]
This means that elements form cations by donating their valence electrons. The number of electrons donated will determine the number of positive charges.
Once the valence electron is more than 4, atoms gain electrons to form ions rather than donating electrons.
For example, sulfur is an element with the atomic number 16. The electron configuration is 2,8,6. In other words, sulfur has 6 electrons in its outermost shell.
To form an ion:
[tex]S + 2e^- -- > S^2^-[/tex]
In summary, cations are formed when atoms donate electrons while anions are formed when atoms gain electrons.
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Select 3
Which of these changes are Physical changes?
1.using electrolysis to break the substance down into simpler substances.
2.burning a substance in oxygen.
3.increasing the mass of a substance.
4.cutting a substance into smaller pieces.
5.boiling a substance.
Earth materials that are soluble in water or react to a weak acid commonly have what type of appearance?.
The chemical equation below represents one of the most important reactions for life on Earth. It describes how plants (and some microorganisms) combine water, sunlight, and carbon dioxide to produce the main source of food for most living organisms, glucose. A byproduct of this reaction is the oxygen we breathe. Is this reaction balanced? You must explain your reasoning for full credit!
PLS HELP, 30 Points!
I also need to know what I need to add to the equation to balance it!
The reaction is not balanced because the number of atoms of the elements on the reactant side isn't the same or equal to that on the product side.
What is Photosynthesis?This is referred to as the process in which green plants manufacture their food in the presence of sunlight and other compounds and is why they are regarded as primary producers in the ecosystem.
The balanced equation for photosynthesis is:
6CO₂ + 6H₂O + light --> C₆H₁₂O₆ + 6O₂
In this, we can see that the number of atoms of the elements of Carbon, hydrogen and oxygen are 6, 12 and 18 which is the same on the reactant and product side which is why the equation given in the question isn't balanced.
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