Answer:
Explanation:
in order for the user to clearly view an image, the microscope must carry out two processes. ... the ability of the microscope to increase the size of the image of an object is called______. magnification. the microscope has the power to show details of an object more clearly.
The power of a microscope to show details of an object more clearly is: resolution.
A microscope can be defined as an optical device which is typically designed and developed to make an enlarged (magnified) image of a minute (very small) object, in order to show all the littlest or tiniest details (information) about the object that cannot be seen by the natural human eye.
Generally, the different types of microscopes include:
Inverted microscope.Compound light microscope.Scanning electron microscope.Polarizing microscope.In Science, the resolution of a microscope is a measure of its power to clearly show the details of an object.
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how electronegativity relates to polar bonding
PLEASE HELP ASAP
Aluminum oxide (Al2O3) and iron (Fe) react according to the following
balanced equation:
4Al2O3 + 9Fe + 3Fe304 + 8A|
If there are 10.2 grams of Al2O3 and 11.2 grams of Fe, which statement
identifies the limiting reagent in this reaction and best supports that claim?
Answer:
Fe is the limiting reagent
Explanation:
In a chemical reaction, the limiting reactant, also known as the limiting reagent. Therefore, the correct option is option C.
What is limiting reagent?In a chemical reaction, the limiting reactant, also known as the limiting reagent, controls how much product is produced. Calculating the percentage value of a reaction is achievable if the limiting reactant has been identified.
Because elements and compounds in an equilibrium chemical equation react in accordance with their mole ratios, there must be a limiting reactant. Therefore, when one of the reactants was present in a larger amount than the other and the mole ratio inside the balanced equation specifies that it takes 1 mole from each reactant to generate a product, the reactant existing in the lesser amount would be the limiting reactant.
4Al[tex]_2[/tex]O[tex]_3[/tex] + 9Fe [tex]\rightarrow[/tex] 3Fe[tex]_3[/tex]O[tex]_4[/tex] + 8A|
moles of Al[tex]_2[/tex]O[tex]_3[/tex] = 10.2 /101.96
=0.10moles
moles of Fe = 11.2/55.8
=0.20
Fe is the limiting reagent
Therefore, the correct option is option C.
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Alex rode his bike from school to home and measured the distance to be 400 meters.
It only took him 10 minutes to get home. What is his average speed in meters per
minute?
O
40m/min
O
.0250m/min
.667m/min
O
240,000m/min
Answer: 40 meters per minute
Explanation:
If the total length was 400 meters and it took him 10 minutes, divide 400 by 10 and boom there you go
Answer:
40 m/min
Explanation: why? because I did that before and it was right so I am sure about the answer and all to do is to divide 400 meter and 10 minutes
which you will get 40
400:10 = 40
which of the following best explains why the strings of a harp make sounds when it is played?
Identify the reaction that would possibly make a good
airbag inflator.
a. Fe (s) + S (s) - Fes (s)
b.CH, (g) + 20 (g) - CO, (g) + 2H,0 (
c. Cao (s) + H20 (1) - Ca(OH), (s)
d. 2KCIO, (s) - 2KCl(s) + 30 (9)
Answer:
D
Explanation:
Cuz i got it wrong and this was the right answer : )
The best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
An airbag refers to certain objects that are put into vehicles to ensure that the occupants of the vehicle do not bump against objects that are within or outside the vehicle when there is a collision.
Since a good airbag must contain substances that quickly react to produce a non-combustible gas that fills up the airbag in order to cushion the effect of a collision, the best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
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Explain how the use of fossil fuels can cause lakes and ponds to become more acidic.
Answer:
Explained below
Explanation:
Fossil fuels which are made up of coal and oil when burnt by power-production industries, make sulfur to be released into the atmosphere where it combines with oxygen to form SO2 (sulfur Dioxide). Now, the exhausts possessed by cars could also cause the formation of nitrogen oxides in the atmosphere. Therefore, H2SO4 which is airborne sulfuric acid and HNO3 which is nitric acid can be formed and when dissolved in the water vapor in the atmosphere form what is called acid rain.
Now, as acid rain flows through the soil, it can leach aluminum from the soil clay particles and then flow into the lakes to make them more acidic.
What’s the answer for this question
Answer:
i think it's B
Explanation:
1.25 x 1025 molecules of glucose (C H202) is
how many moles of glucose?
Answer:
1281.25 Moles of glucose
Explanation:
Multiply 1.25x1025= 1281.25
How many moles are in 4.0 x 1023 atoms of iron?
Answer:
4092 atoms of iron i am guessing
Explanation:
I need help in this questions
Answer:
just use calculator mannn
If 2.2 moles of calcium oxide are decomposed, how many moles of oxygen are produced?
2CaO --> 2Ca + O2
Answer: Since the reaction is 2Ca(NO3)2 = 2CaO + 4NO2 + O2
1) - given the stoichiometric coefficients, we know that 2 moles of Ca(NO3)2 will produce 4 moles of NO2, hence, 1 mole will produce 2 moles of NO2
2) - 328 g produces 22.4 L, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, 65.6 g produces (65.6*22.4)/328 = 4.48 L
3) - 328 g produces 112 g CaO. Therefore, 65.6 g produces = (65.6*112)/328 = 22.4 g CaO.
4) - Given the stoichiometric coefficients, we know 5 moles of gaseous products are already being produces ( 4+1) by 2 moles of reactant.
5) - 44.8 L at STP = 2 moles of NO2, since One mole of any gas at S.T.P. occupies the same volume which is 22.4 L.
Hence, to produce 2 moles of NO2, we need 1 mole of reactant = 164 g
Hope this helps :)
Explanation:
hey y’all, I’m growing a plant for science class but I need some questions about the plant, can someone please give me atleast 3 questions to answer for it.. can you give me atleast one tricky one
Hurry pls <3
Answer:
What type of plant
Where is it mainly found
What are some facts about it?
Label each process as a physical or chemical change and state how you know.
fogging a mirror with your breath
breaking a bone
mending a broken bone
burning paper
slicing potatoes for fries
mixing sugar with coffee
frying chicken
a nail rusting
paper ripping
wood burning
mixing water and food coloring
food molding (rotting)
writing on paper
dyeing fabric
Fogging a mirror with your breath is a physical change because it involves a phase change of water vapor condensing and adsorbing to the mirror surface. Phase changes are physical changes.
Breaking a bone is a physical change insofar as we're focusing on the "breaking" part.
Mending a broken bone, however, is a different story. Bones are living things: They consist of tissues that in turn consist of cells. The actual mending process involves some very complicated biochemistry. Suffice it to say that mending a broken bone would be a chemical change.
Burning paper is a chemical change. Burning anything implies combustion, which is a chemical reaction where some fuel is oxidized (usually by oxygen gas, producing carbon dioxide gas and water vapor).
Slicing potatoes for fries is a physical change. You can slice, dice, smash, mash, stretch, bend, compress, or grind a potato: What you will have is still a potato (okay, there are some chemical changes going on as you're rupturing cells in the process, causing them to release their contents which may participate in chemical reactions). But the key, again, is that cutting up some material doesn't fundamentally change the chemical identity of that material.
Mixing sugar with coffee actually involves two physical processes: the mixing and the (presumed) solvation of the solid sugar particles as they dissolve into the coffee. In either case, either mixing or dissolving would be a physical change. The sugar molecules are still in the coffee and are chemically unchanged.
Frying chicken is a chemical change. In fact, frying chicken likely entails several different types of chemical changes. The common thread among them is that frying involves breaking chemical bonds in and on the chicken by the addition of thermal energy, and new chemical bonds end up being formed. That's the hallmark of a chemical change.
A nail rusting is a chemical change. Rusting is an electrochemical process; the familiar corrosion of iron into rust is, at bottom, a chemical reaction where iron reacts with oxygen to form iron oxides (often catalyzed by the presence of water and salts).
A paper ripping is analogous to slicing potatoes: it's a physical change. If you ripped one sheet of paper into two halves, each half would retain all the chemical properties of the original sheet.
Likewise, wood burning is analogous to burning paper, and as such is a chemical change. Again, combustion is a chemical process.
As we said earlier with sugar in coffee, mixing in itself is a physical process. While it may seem like you've permanently changed the nature of the water by dyeing it with food coloring, the molecules comprising the food coloring are simply dispersed within the vast sea of water molecules. There are no intramolecular bonds that are broken or formed; the chemical identities of all the substances here are preserved. So, this is a physical change.
Food molding (rotting) is a chemical change. Rotting is biochemical decomposition: the chemical bonds that make up the food are broken down by enzymes released by the mold.
Writing on paper, whether it be with a pen, pencil, crayon, or marker, is a physical change. The molecules from the writing instrument are physically stuck to the paper. But unless you're writing on paper by, say, burning letters onto it, there are no chemical changes occurring when the writing instrument meets the paper.
As with writing on paper, dyeing fabric can be a physical change. The dye consists of molecules that interact with light in a way that we perceive a certain color. When dyeing fabric, these molecules are transferred and fixed into the fabric by adsorption, absorption, and other intermolecular phenomena. But the molecules of the dye (and the molecules in the fabric) don't experience any breaking and forming of bonds. All of the substances involved retain their chemical identities.
However, it's possible that, depending on the dye, there may be chemical changes involved. Some dyes, appropriate named "reactive dyes," undergo chemical reactions with their substrate (which, in this case, would be the fabric), or dyes may be used that undergo chemical reactions with one another, both of which would constitute chemical changes. And it can depend on what you mean by "dyeing": Bleaching a colored shirt can technically be conceived of as "dyeing" the shirt white, and this process involves cleavage of bonds within the color-producing molecules in the fabric by reacting with the molecules in the bleach.
So, for dyeing fabric, it can be a physical or chemical change depending on the dye.
need asap!
The boiling point of hydrogen sulfide is low. Explain why.
Sulfur is not nearly as electronegative as oxygen so that hydrogen sulfide is not nearly as polar as water. Because of this, comparatively weak intermolecular forces exist for H2S and the melting and boiling points are much lower than they are in water.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide.
What is polar molecule?If a molecule does have more positive charges on one end than negative charges on the other, an electrical pole has been created. This is how polar molecules are typically formed.
What is boiling point?
The temperature where a liquid's vapor pressure reaches the pressure around it as well as the liquid transforms into a vapor is known as the boiling point of a substance.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide. Additionally, hydrogen sulphide has a lesser melting point as well as boiling point than water due to poor intermolecular forces (dipole forces, Vander Waal's forces).
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A molecule is
A a group of atoms bonded by ionic bonds.
B a group of atoms bonded by covalent bonds.
C a group of ions bonded by covalent bonds.
D a group of atoms bonded by metallic bonds.
Answer:
B.
Explanation:
Atoms make up molecules and ionic bonds cannot make up a molecule because they do not share electrons like in a covalent bond.
b Explain what would have happened if Jilly
had thrown the object with more force.
Answer:
force had thrown the object with more
Answer:
If an object is in motion and more force is applied to it, the object will begin moving faster
Explanation:
don't have any (sorry:[ )
What force(s)
might cause a car
to slow down?
Friction
Applying the brakes
Wind
All of the above
Elaborate on the nuclear model of the atom. The nuclear model describes the atom as protons and neutrons distributed throughout a sea of electrons. The nuclear model describes the atom as electrons uniformly scattered in a positive cloud of protons. Eliminate The nuclear model describes the atom as a small, negative center enveloped by a cloud of positive particles. The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Answer:
D.) The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Answer
The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
pls help i have to pick 3 T-T
Answer:
Explanation:
elemant
compound
mixture
Name:
1. The nucleus is the part of the atom that
A consist mostly of empty space
B.
has a negative charge
Coccupies most of the atom's total volume
D. contains most of the atom's total mass
Answer:
D.
Explanation:
There are three types of particles within atoms: protons, neutrons, and electrons.
Electrons have essentially no mass and orbit the nucleus in various energy levels.
Protons and neutrons have mass and are both found within the nucleus of the atom.
20 Points!!
Need it as soon as possible.
Answer:
D.
Explanation:
The reaction is losing potential energy, which means that the reaction is losing that energy as heat. Exothermic is the loss of energy. Therefore it will be D.
A student has a cube with each side is 4 cm in length, what is the volume? What is the measurement unit? Select ALL that apply.
Answer:
64cm^3
Explanation:
To get the volume just multiple 4*4*4
An atom that has lost one or more electrons is a(n) _____.
Not Cation
Answer:
ion
Explanation:
that is the definition according to g o o g l e:
"an atom or molecule with a net electric charge due to the loss or gain of one or more electrons."
Answer:
An ION
Explanation:
Because a positive ion is called a CATION and a negative ion is called an ANION (Please brainlist me)
Why is there a difference in the heating rates of land and water?
examine the diagram of the cell which or general is marked with an X help
Answer:
I'm pretty sure it's the cell membrane
Use the following equation to answer the questions below.
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)
1. What type of reaction is this? Why do you say it is this type of reaction? Support your claim with evidence. (2 points, 1 point valid type of reaction, 1 point valid evidence)
2. What is the mole ratio of methane to water in the reaction? (1 point correct mole ratio)
3. How many moles of water are produced from the reaction of 50.0g of methane (CH4)? Show your work (2 points, 1 point valid answer, 1 point valid work)
Answer:
1-Double replacement
Explanation:
Why does oxygen have a higher electronegativity compared to chlorine?
Answer:
The electronegativity of fluorine compare to the electronegativity of oxygen and chlorine as below
Explanation:
Fluorine has the highest electronegativity than oxygen, and chlorine.
Explanation
Generally the electronegativity increase across the period ( from the left to the right) and decreases down the group.
Both oxygen and fluorine are in period 2 in periodic table. since fluorine is on fur right side as compared to oxygen , fluorine has higher electronegativity than oxygen.
On the other side Fluorine and chlorine are in the same group in periodic table. fluorine is at the top of the group while chlorine is at the bottom therefore fluorine has higher electronegativity than chlorine.
How long is radioactive waste from nuclear plants radioactive?
a-100 years
b-10,000 years
c-100,000 years
d-1,000 years
Answer:about 10,000 years b maybe
Explanation:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.
The radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.
What is Radioactive waste?
The waste produced by a nuclear power plant or lab is referred to as radioactive waste. They include radioactive substances that are dangerous to the environment and the majority of biological forms. The wastes degrade over time.
Radioactive wastes are stored to-
allow some radioactive wastes to decay to nonradioactive wastes, reduce transport risks; provide lag storage between waste generator, treatment, and disposal sites; simplify disposal; and manage radioactive wastes until disposal facilities become available.Therefore, the radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.
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When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.
Answer:
Contact
Explanation:
As the speed of the particles increases, they move around more, which means they hit the sides of the container more.
7. Why would it be difficult to measure the rate of reaction for the rusting of iron?
Answer:
For rusting, it is difficult to write an equation due to the complexity of the reaction. Thus, we can express the reaction like the following. According to the law of conservation of mass, the increased mass of nail and rust is the amount of oxygen.
Explanation:
I hope this helps:)