Answer:
you need to have a question or a problem first
Suppose that a TLC plate is spotted with samples 1.0 cm above the bottom of the plate. Select the consequence of inserting the plate into a developing chamber containing a pool of developing solvent that is 1.2 cm deep
(a) The compounds in the samples will leach into the pool of developing solvent resulting in poor resolution.
(b)The pencil marks will dissolve into the developing solvent.
(c)The increased capillary action will cause the compounds to migrate up the plate more quickly.
(d)The increased depth of developing solvent will result in better resolution of the compounds in each sample.
Answer:
The compounds in the samples will leach into the pool of developing solvent resulting in poor resolution.
Explanation:
The aim of thin layer chromatography is the separation of a mixture. Usually, the stationary phase is spotted with the mixture. A mark is made with a pencil at the point to be spotted.
It is necessary to note that the solvent must be below the spot where the mixture is. This is because, if the solvent is above the spot of the mixture to be separated, the components of the mixture will dissolve away in the solvent resolution in poor separation. This is exactly what will happen when the sample is spotted at 1.0 cm above the bottom when the solvent is 1.2 cm above the bottom.
NEED HELP FAST!!!!
Points A and B are locations on the banks of a river. What are the dominant processes occurring at locations A and B? *
A. deposition at location A; erosion at location B
B. erosion at location A; deposition at location B
C. deposition at both locations A and B
D. Erosion at both locations A and B
Answer:
C
Explanation:
You come across a mysterious substance that has a mass of 1.8225 x 10 to the power of 2g
and a volume of 0.025 L (1L = 1000 mL). Using the density formula what is the density
Answer:
192
Explanation:
Bc its 182
The Tacoma narrows bridge collapsed due to?
A. Refraction
B. Reflection
C. Diffraction
D. Resonance
in a hydraulic lift system, the output force is greater than the input force because
Answer:
In a hydraulic lift system, the output force is greater than the input force because the pressure acting on the output piston is greater than the pressure acting on the input piston.
Explanation:
The hottest place in California is Death Valley with a record temperature of 130 ⁰F. Calculate the temperature in ⁰C and K.
Answer:
54.(4)° C (the 4 in the parentheses means the 4 goes forever), 327.594°K
Explanation:
When you convert 130°F to °C, you will get 54.(4)°C, and the 4 in the parentheses goes forever, and 130°F to °K is 327.594°K, hope it helps!
Which statement best describes the difference between veins and arteries? *
veins carry oxygen rich blood back to the heart while arteries carry oxygen poor blood
away from the heart
veins carry oxygen poor blood back to the heart while arteries carry oxygen rich blood
away from the heart.
brings oxygen into the lungs and releases carbon dioxide and water (waste materials)
from the body
arteries carry blood that is carbon dioxide rich to the heart,
Answer:
Veins carry oxygen poor blood back to the heart while arteries carry oxygen rich blood
What measuring tool is used to find the volume of a shoe box?
A.water displacement
B.scale
C.beaker
D.ruler
Answer:
D. Ruler
Explanation:
Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.
Explain the term catalyst and how it affects the rate of a chemical reaction.
Answer:
Catalyst. A catalyst speeds up a chemical reaction, without being consumed by the reaction. It increases the reaction rate by lowering the activation energy for a reaction. Energy diagrams are useful to illustrate the effect of a catalyst on reaction rates.
Explanation:
Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have?
Answer:
hydrogen is a non-metal, and has one valence electron.
Explanation:
Hope this helps!!
Hydrogen shows properties of both metals and nonmetals. However, hydrogen is placed with the alkali metals since it contains one valence electrons.
What is hydrogen ?Hydrogen is the first element in the periodic table. It has only one electron and it is the valence electron of hydrogen. Therefore, hydrogen is placed in the first group of periodic table.
Hydrogen needs one more electrons to become stable. The 17th group elements halogens also have a valency of one. Hence, hydrogen shows some chemical similarities with halogens also.
Mostly hydrogen forms covalent bonds like non-metals and in rare cases, hydrogen forms ionic bonds by donating its electron. Therefore, hydrogen is mostly considered as a non-metal.
Find more on hydrogen;
https://brainly.com/question/11837837
#SPJ2
A horse traveled a distance of 20 miles in 2
hours. What was the horse's speed?
Answer:
The horses speed was 10 miles per hour.
Explanation:
20/2=10
Hope this helps!
What type of reaction is the equation 2NaCl → 2Na +Cl2?
Answer:
Synthesis reaction
Explanation:
This is a synthesis reaction. When you combine sodium metal (Na) with chlorine gas (Cl), you form sodium chloride or kosher salt (NaCl).
Hope this explanation helps!
a sample of alcohol has a density 0.82 g/ml.what is the mass of 5500 mL of the alcohol
Answer:
The answer is 4510 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 0.82 g/mL
volume = 5500 mL
We have
mass = 0.82 × 5500
We have the final answer as
4510 gHope this helps you
What happens to particles in a sample of liquid when the liquid is heated and cooled?
what are the spectrum lines, and they're color emmited and nanometers
Emission lines are seen as coloured lines on a black background. Absorption lines are seen as black lines on a coloured background. The presence of spectral lines is explained by quantum mechanics in terms of the energy levels of atoms, ions and molecules.
i hope it is helpful:) mark as brainlist
Convert the following to Celsius
6) 32°F
7) 45°F
8) 70°F
9) 80° F
10) 90° F
11) 212°F
9. (80-32)5/9
48×5/9
240/9
26.66°C
9. (90-32)5/9
58×5/9
32.22°C
10 (212-32)5/9
180×5/9
20×5
100°C
Rain is falling at 2.00 inches per hour. How many inches have fallen in 6000.0 seconds?
8. What is Planck's law?
O F = hm
O F = MA
O E = hf
O E = mc (squared)
Answer:
O E = hf
Explanation:
Which noble gases is closest to magnesium? On the periodic table? What must happen if a magnesium atom for it to have an electron arrangement similar to that of a noble gas?
Answer:
Neon and loose electrons
Explanation:
Magnesium has an electron configuration of 2e 8e 2e, and Neon is 2e,8e. For Mg to have a similar electron arrangement it must loose its two valence electrons and make it an ion.
Answer:
Noble neon gas is the closest.
Explanation:
noble Neon gas
The Magnesium would have to lose two electrons
What happens to energy when frequency
is reduced by one half?
Energy is doubled
Energy is squared
Energy is halved
Energy remains constant
Answer:
Energy is halved.
Explanation:
Energy and Frequency are directly proportional. If frequency decreases, energy increases. If frequency increases, energy increases. If frequency is halved, energy is also halved.
Do you believe that in 2020 every single American, regardless of race, sex, or income level, has an equal opportunity to achieve his/her American Dream? Why or why not?
Answer:
Tbh i rlly dont think that many will. Most may succeed in doing so. But i mean come on its 2020 anything can happen.
Explanation:
Answer:
yes 100% what reasons r there to not tho
Explanation:
During a change in state, energy is transferred in the form of
heat
light
moisture
motion
Answer:
heat I think.....
Hope it will help you......During a change in state, energy is transferred in the form of heat.
Hence, Option (A) is correct.
What is States of matter ?
When energy is added or removed to matter in the form of heat, it changes state to form a state of matter.
A state of matter is defined as one of the ways in which matter can interact with itself to form a homogeneous phase.
Therefore , During a change in state, energy is transferred in the form
of heat. Hence, Option (A) is correct.
Learn more about States of matter here ;
https://brainly.com/question/9402776
#SPJ2
Which example best demonstrates stewardship of the atmosphere
Incomplete question. However, I provided a specific example of stewardship of the atmosphere.
Explanation:
First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.
An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.
Explain the term rate of a chemical reaction.
Answer:
The rate of a reaction is a measure of how quickly a reactant is used up, or a product is formed.
Explanation:
Calculate number of moles in 42g of silicon.
Answer:
[tex]\frac{3}{2}[/tex]
Explanation:
No of moles : [tex]\frac{given mass}{atomic mass}[/tex]
so the given mass is 42 gm and atomic mass of silicon is 24 when u solve it u get 3/2
Which term describes this molecular shape?
A. Tetrahedral
B. Bent
C. Trigonal planar
D. Linear
Answer:
A
Explanation:
Tetrahedral
The term that describes the molecular structure is Tetrahedral. The correct option is A.
What is molecular structure?The molecular structure is the structure of the molecular compounds. It tells the presence of ions and bonds in a compound. It is the arrangement of atoms, groups, or ions in a molecule, as well as the quantity and distribution of chemical bonds.
The use and importance of molecular structure are comprehending Nature's complex design principles and blueprints depend on understanding molecular structure.
Perhaps we can start to imitate her lovely items more cheaply and with less negative environmental effects if we can comprehend her plans and fundamental materials. The given compound is tetrahedral.
Thus, the correct option is A. Tetrahedral.
To learn more about molecular structure, refer to the link:
https://brainly.com/question/503958
#SPJ2
HELPPPP I WILL GIVE YOU BRAIN THINGG WHATEVER ITS CALLED
We have learned that there are five steps to reading a new piece of music. Can you name all five steps?
Notes, Pitches, Articulation, Phrasing, and Musical Extras.
Annalise observes a streak of light in the sky and says she is seeing a shooting star. What is she most likely observing?
a falling star
an asteroid
a meteor
a dwarf planet
Answer: A Meteor
Explanation:
A streak of light in the sky and says she is seeing a shooting star. She's most likely observing is a meteor. Therefore, option C is correct.
What is a meteor ?A meteor is an object from space or a meteoroid that touches down on Earth. The air on the space rock creates drag that causes it to become incredibly heated as it falls toward Earth.
When the earth travels through cometary debris during its orbit around the Sun, meteor showers will result. Although the Earth's orbit around the Sun is nearly round, the majority of comets have very elliptical orbits.
A meteoroid becomes a meteor, or a streak of light in the sky, if it gets close enough to Earth and enters its atmosphere. These light striations are sometimes referred to as "shooting stars" due to their appearance. However, stars are not what meteors are.
Thus, option C is correct.
To learn more about meteor, follow the link;
https://brainly.com/question/11504264
#SPJ2
Where in equation for photosynthesis does carbon dioxide belong
Answer:
The equation for photosynthesis is 6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2, so carbon dioxide will be found in the reactant part of the equation.
how would you differentiate between acid and bases if the list of their chemical formula is given to you