Answer:
human can see visible light
Answer:
i beleive it is D. visible light
Explanation:
if im wrong sorry this subject isnt my forte
Find the energy of a beam of x-ray radiation with a wavelength of 9.23
nanometers.
Answer:
E = 2.15 ×10⁻¹⁷J
Explanation:
Given data:
Wavelength of X-ray = 9.23 nm (9.23×10⁻⁹ m)
Energy of x-ray = ?
Solution:
Formula:
E = hc/λ
h = planks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /9.23×10⁻⁹ m
E = 19.89 ×10⁻²⁶ J.m/9.23×10⁻⁹ m
E = 2.15 ×10⁻¹⁷J
Which of the following best explains the uneven nature of the exposed rock layers
Answer:
where is the picture?
Explanation:
no picture at all....
the element chlorine is a member of which chemical family?
Answer:
is it from bleacH?
Explanation:
hazardous
Answer:
halogen family
Explanation:
An atom can be called a particle, but a molecule is never called a particle. True or false. Thanks everyone for your help
HURRY PLEASE
Which are functions of the stomata in the leaves of seed plants? Check all that apply.
reduce water loss
make glucose
absorb sunlight
take in carbon dioxide
produce oxygen
Answer:
reduce water loss
absorb sunlight
take in carbon dioxide
produce oxygen
Explanation:
i think
Answer:
A, D, and E
Reduces water loss, take in carbon dioxide, and produce oxygen.
Explanation:
A solution of 0.0027 M K2CrO4 was diluted from 3.00 mL to 100. mL. What is the molarity of the new solution?
Answer:
[K₂CrO₄] → 8.1×10⁻⁵ M
Explanation:
First of all, you may know that if you dilute, molarity must decrease.
In the first solution we need to calculate the mmoles:
M = mmol/mL
mL . M = mmol
0.0027 mmol/mL . 3mL = 0.0081 mmoles
These mmoles of potassium chromate are in 3 mL but, it stays in 100 mL too.
New molarity is:
0.0081 mmoles / 100mL = 8.1×10⁻⁵ M
Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of *
increasing the concentration of enzymes
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH
Answer:
slowing the rate of enzyme action
Explanation:
The prevention of fruits browning is the result of :
>slowing the rate of enzyme reaction
How is the browning of fruits prevented?The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.
Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.
The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.
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Determine the best course of action when acid or base is spilled on the skin. Apply base to an acid burn, or acid to a base burn. Remove as much of the acid or base as possible using a towel. None of these actions are appropriate. Rinse the affected area immediately with water.
Answer:
You have to apply the base to an acid burn and vice versa.
Explanation:
If acid or base is spilled on the skin, immediately wash the affected area gently with lukewarm water and get medical attention immediately. Therefore, option (D) is correct.
How to care for acid or base exposure?Exposure to strong acids or bases such as sulphuric acid can take place as skin contact, inhalation of vapors, or ingestion. Each type of exposure can rise serious hazards to health and must be managed quickly and reduce damage and health risks appropriately by medical professionals.
If acid comes into contact with the skin, quickly wash the affected area gently with cold water and seek medical attention immediately. If acid or base gets into your eyes, then flush the eyes with water.
If accidentally ingest strong acid or base, rinse your mouth immediately with water and continually rinse your mouth with water. If you inhale acid or base aerosols, breathe fresh air, and get medical attention immediately.
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What ingredients are used to make chloroform.
:p
Answer: i dont no
Explanation:
ddd
A mid-ocean ridge occurs at what boundary?
Answer:
Divergent boundary plate
Explanation:
I hope this helps but this question has its answer at the top of google when you search it
Question:
A mid-ocean ridge occurs at what boundary?
1. Convergent Boundary Plate
2. Divergent Boundary Plate
3. Transform Boundary Plate
Answer:
2. Divergent Boundary Plate
What would be the matching DNA strand for the code below?:
A A T G C G G T C C
A. TTGTACCTCC
B. GGCATAACTT
C. TTTGGCATT
D. TTACGCCAGG
Answer:
D. TTACGCCAGG. that would be your answer.
Answer:
i think its either A TTGTACCTCC or D TTACGCCAGG
Explanation:
How many moles of hydrogen gas would be produced for every mole of magnesium added into the HCl solution?
Because they have an extended structure, elements that are _____
tend to be in the________
state at room temperature
What symbolizes a seamount A:2 B:3 C:4 D:5
Answer B3
Explanation:
What are the large plates that move? O gigantic plates O tectonic plates O volcanic plates O rock plates
Answer:
Tectonic plates
Explanation:
Tectonic plates are large plates that moves. There are different types of plate motion as a result of mantle convection.
A tectonic plate is better as referred to as the lithospheric plate. It is made up of a part of the upper mantle and the overlying crust. Together, they move over the fluid asthenosphere below. The mantle below drives the lithosphere above.What mass of sucrose, C12H22O11, should you dissolve in 100.0 g of water to obtain a solution in which the mole fraction of C12H22O11 is 0.124?
Answer:
the sucrose mass is 264.g
Explanation:
The computation of the sucrose mass is shown below;
The Molar mass of [tex]C_{12}H_{22}O_{11}[/tex] is 342.3 g/mol
And, the molar mass of [tex]H_2O[/tex] is 18g/mol
The mass of [tex]C_{12}H_{22}O_{11}[/tex] be Y
Now
The moles of [tex]C_{12}H_{22}O_{11}[/tex] is
= Mass of [tex]C_{12}H_{22}O_{11}[/tex] ÷ molar mass of [tex]C_{12}H_{22}O_{11}[/tex]
= Y ÷ 342.3 mol
And,
The moles of [tex]H_2O[/tex] is
= Mass of [tex]H_2O[/tex] ÷ molar mass of [tex]H_2O[/tex]
= 100.0 ÷ 18
= 5.56mol
Now
The molar fraction of [tex]C_{12}H_{22}O_{11}[/tex] is
= Moles of [tex]C_{12}H_{22}O_{11}[/tex] ÷ (moles of[tex]C_{12}H_{22}O_{11}[/tex] + moles of [tex]H_2O[/tex]) = 0.124
= (Y ÷ 342.3) ÷ [(Y ÷ 342.3) + 5.56] = 0.124
Y ÷ 342.3 = 0.124 × [(Y ÷ 342.3 + 5.56]
Y = 0.124 × Y + (0.124 × 5.56 × 342.3)
Y = 269.4 g
hence, the sucrose mass is 264.g
25POINTS!! useless answers will be reported
Assignment Summary
For this assignment, you will ask questions about the factors that have caused a rise in global
temperatures over the past century. Then, you will conduct research to answer your questions. You will
also graph provided information, analyze the graphs, and make conclusions based on the graphs. Finally,
you will write a paper describing the conclusions of your research and graphs.
Answer:
Life on Earth depends on energy coming from the Sun. About half the light reaching Earth's atmosphere passes through the air and clouds to the surface, where it is absorbed and then radiated upward in the form of infrared heat. About 90 percent of this heat is then absorbed by the greenhouse gases and radiated back toward the surface. Scientists attribute the global warming trend observed since the mid 20th century to the human expansion of the "greenhouse effect" warming that results when the atmosphere traps heat radiating from Earth toward space.
Certain gases in the atmosphere block heat from escaping. Air pollution is the main cause of rise in temperature over the past century. Due to increase in the industrialization in different countries of the world and also burning of more fossil fuels in the engines of vehicles and jets are the main reasons for increasing global temperature. On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2. To a lesser extent, the clearing of land for agriculture, industry, and other human activities has increased concentrations of greenhouse gases.
Climate extremes, such as droughts, floods and extreme temperatures, can lead to crop losses and threaten the livelihoods of agricultural producers and the food security of communities worldwide. Depending on the crop and ecosystem, weeds, pests, and fungi can also thrive under warmer temperatures, wetter climates, and increased CO2 levels, and climate change will likely increase weeds and pests.
Why does burning fossil fuel affect the environment?
How does the atmosphere play into this all?
How do cars affect the global climate?
How do greenhouse gases such as carbon dioxide cause global warming?
Explanation:
How many total electrons would that neutral atom contain? Answer
Answer:
Electrically neutral atoms simply possess the same number of electrons as protons. This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons. This results in an imbalance of charge.
- Physicsclassroom
Answer:
Electrically neutral atoms possess the same number of electrons as protons. (It gives the objects a balance of both type of charge).
Explanation:
How does this particle arrangement of water change when heated from 46 Celsius to 102 Celsius
Explanation:
As a water is heated from 46°C to 102°C, the particle arrangement of the water molecules changes.
Water at 45°C is in liquid form. The molecules are still attached to one another and flows. Water heated through and now 102°C is now steam or vapor. The molecules have no attractive force between them again. These molecules are now in gaseous state. Also, they have become randomized.We use the term evaporation to describe this kind of change.
answer: the substance will change from a liquid state to a gaseous state
explanation: 46 degrees celsius means that the particles are in a liquid state, when the particles are heated up to 102 degrees celsius, it means that the particles are now in a gaseous state
why is temperature effective at speeding up a chemical reaction
Answer:
so basically the particles move faster
Explanation:
which is made from the cause of a chemical reaction do u get it now?
if a snail crawls 12 centimeters per hour, how long will it take for the snail to travel 1 meter?
answer NOW
Answer:
8 hours 20 minutes
Explanation:
How would the number 3475.32 in be expressed in scientific notation? *
Explanation:
i think 3x10^5
hope this helps if not sorry
How many grams of hydrogen are in 6.0g of sucrose?
Answer:
The formula for sucrose is
C12H22O11
moles sucrose = mass / molar mass
= 6.0 g / 342.30 g/mol
= 0.017528 mol
the formula shows that each sucrose molecule has 22 H atoms
so moles H = 22 x moles sucrose
= 0.3856 mol
mass H = molar mass x moles
= 1.008 g/mol x 0.3856 mol
= 0.3887 g
= 0.39 g ( 2 sig figs)
A heater is placed under one corner of a water bed mattress. Warm water moves throughout the mattress because of ____________________________
A. conduction
B. convection
C. Radiation
A heater is placed under one corner of a water bed mattress. Warm water moves throughout the mattress because of convection. The correct option is B.
What is convection?Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids.
Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.
When heat is transferred from your body by moving air, convection takes place. The air will rise if it absorbs your heat and is cooler than the environment.
Cooler air moves in to take its place and absorb more of your warmth as the warmed air rising around you increases. You feel cooler as this air moves more quickly.
Thus, the correct option is B.
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Determine the molar mass of iron(II) chloride hexahydrate. Provide an answer to two decimal places.
Answer:
FeCl₂ · 6H₂O = 234.75 g/mol
Explanation:
Iron (II) = Fe²⁺
Number between () indicates the oxidation state
Chloride = Cl⁻
Iron (II) chloride = FeCl₂
If we say hexahydrate, it means that our salt is hydrated by 6 molecules of water.
FeCl₂ · 6H₂O = Iron(II) chloride hexahydrate
Molar mass is = 55.85 g/mol + 35.45 g/mol . 2 + 6 . 18g/mol = 234.75 g/mol
We have just summed molar mass of Fe, plus Cl (x2), plus 6 H₂O
Which of these steps is most likely to be part of an investigation about friction?
A.
putting different kinds of batteries in a toy car
B.
measuring how long it takes one full cup of water to evaporate
C.
testing which surface is easier to slide a wooden block across
D.
counting how many paper clips stick to a magnet in a chain
Answer:
I want to say option C: Testing which surfa e is easier to slide a wooden block across.
Explanation:
I'm not 100 % sure though with my answer. I'm truly so very sorry if my answer is wrong. I tried my best.
In physics, friction is said to be the opposing force that resists any object. Testing which surface is more effortless to slide a block across can be used to investigate friction. Thus, option c is correct.
What is friction?Friction has been defined as the resisting force that opposes the movement of objects across the surface. It can also be said as a force that opposes the relative motion of an object.
The friction can be rolling, sliding, fluid, or static depending on the surface and type of object. The frictional force is present only when the object has been in contact of the surface body.
When a surface is tested for sliding the wooden block, then the sliding friction has been used. It is possible as the resistant force of the surface with respect to the block is taken into the consideration.
Therefore, option C. the surface testing for sliding wooden blocks involves friction.
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What is the minimum cation-to-anion radius ratio (rC/rA) for an octahedral interstitial lattice site?
Answer:
0. 414
Explanation:
Octahedral interstitial lattice sites.
Octahedral interstitial lattice sites are in a plane parallel to the base plane between two compact planes and project to the center of an elementary triangle of the base plane.
The octahedral sites are located halfway between the two planes. They are vertical to the locations of the spheres of a possible plane. There are, therefore, as many octahedral sites as there are atoms in a compact network.
The Octahedral interstitial void ratio range is 0.414 to 0.732. Thus, the minimum cation-to-anion radius ratio for an octahedral interstitial lattice site is 0. 414.
A large ice sculpture of a swan has a greater temperature than a lit match.
O True
O False
What is the most significant chemical difference between triacylglycerols and glycerophospholipids that leads to their different functions?
Answer:
Triacylglycerols (triglycerides) are non-polar or hydrophobic molecules
Glycerophospholipids (phosphoglycerides) are polar or hydrophilic
Explanation:
Triacylglycerides (TGs) are esters synthesized by the esterification of three molecules of glycerol and fatty acid, and this is essentially by the replacement of the three hydroxyl groups on glycerol with three fatty acids. This removes the hydrophilic property from the glycerol molecule hence TGs are only soluble in non-polar solvents like alcohol and benzene, and TGs are therefore the storage forms of fats in adipose tissues.
Glycerophospholipids are formed by the addition of two hydrophobic fatty acid groups and one phosphoric acid (phosphate group) to glycerol (alcohol) leaving a hydrophilic head (phosphate end) and a hydrophobic tail (fatty acid ends). This amphipathic property of this molecule makes it a suitable molecule for membrane structures, especially of cells (lipid bi-layer), with an arrangement where the hydrophilic side interacts with the aqueous environment, while the hydrophobic side makes contact with the non-aqueous environment.
Triacylglycerols-
They are nonpolar, hydrophobic, and insoluble in water. This is due to the ester linked bond between the polar hydroxyls of glycerol and the polar carboxylates of the fatty acids.Glycerophospholipids-
Glycerol-based phospholipids. The alcohol here is glycerol, to which two fatty acids and phosphoric acid are attached as esters. The two fatty acid chains attached to the molecule of glycerol are nonpolar hence hydrophobic While the polar heads which mainly consists of the phosphate group attached to the third carbon of the glycerol molecule is hydrophilic.Learn more:
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Fix the formula for Mg3F
Write out the full correct formula?
Answer:
[tex]MgF_2[/tex]
Explanation:
Hello!
In this case, since, when we see an ionic binary salt like that formed by magnesium (metal) and fluorine (nonmetal), in order to set up the correct molecular formula we need to check out the periodic table in order to identify the suitable oxidation states, since metals remain positively charged as they lose electrons and nonmetals negatively charged as they gain electrons.
In such a way, since the oxidation state of magnesium is +2 and that of fluorine is -1 we write:
[tex]Mg^{2+}F^-[/tex]
Next, we need to exchange the oxidation states as subscripts without the charge to obtain:
[tex]MgF_2[/tex]
Which is the corrected molecular formula for magnesium fluoride.
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