Because only certain size electron orbits are allowable, the frequency and energy of the electron is quantized
According to the Bohr model of the atom, an electron moves from a lower to a higher energy level when it absorbs energy. This energy is released when the electron returns to ground state.
According to the Bohr model, only certain size electron orbits are allowable hence the frequency and energy of the electron is quantized.
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Some substances like chalk, duster, paper, wood, air are not found in the periodic table. why?
Answer:
They are not pure elements, instead they are compounds, hence why they are not found on the periodic table. (Periodic table only consists of pure elements)
an increase in enzyme or substrate concentration will
Answer: It will increase the rate of reaction
Explanation:
An increase in enzyme or substrate concentration will increase the rate of reaction.
What is an enzyme?An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell.
Initially, an increase in substrate concentration leads to an increase in the rate of an enzyme-catalyzed reaction. As the enzyme molecules become saturated with substrate, this increase in reaction rate levels off.
The rate of an enzyme-catalyzed reaction increases with an increase in the concentration of an enzyme.
Hence, an increase in enzyme or substrate concentration will increase the rate of reaction.
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classical,alchemical,medical and technological traditions were chemistry forerunners. identify the contributions which of these made to the development of chemistry
Answer:
The term “alchemy” brings to mind a cauldron-full of images: witches hovering over a boiling brew, or maybe sorcerers in smoky labs or untidy libraries. Despite these connotations of the mythic and mystical, alchemical follow contend a crucial role within the evolution of contemporary science.
Historically, alchemy refers to each the investigation of nature and an early philosophical and religious discipline that combined chemistry with metal work. Alchemy additionally encompassed physics, medicine, astrology, mysticism, spiritualism, and art.
Alchemy was scientific however it absolutely was additionally a religious tradition. a number of its practitioners had selfless intentions. for example, if alchemists might learn the key of “purifying” base metals into gold, they could gain the flexibility to purify the human soul. At an equivalent time, alchemy has typically been seen as a get-rich-quick theme and plenty of alchemists as charlatans and pretenders. however several alchemists were really serious-minded practitioners whose work helped lay the groundwork for contemporary chemistry and medication.
Explanation:
Alchemy for short answer if needed.
what is the purpose of an auxiliary complexing agent?
Answer:
prevent hydroxide formation
Explanation:
Why is formula equation more meaningful than a word equation?
The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure.
Answer:
The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure
Explanation:
The formula equation is more meaningful than a word equation because the word equation only defines what the reactants and products are, whereas the formula equation defines which and how much of each element is present in the chemicals and also give some indication as to their structure
Oxygen cannot be broken
down into a different
substance. What can we call
oxygen?
Answer:
• Oxygen is an element
Answer:
We can call it an element.
Help meeeeeeeeeeeeeee
Answer:
whatttttttttttttttttttttttt
Answer:
Breaking glass - chemical change
popsicle - physical
milk - chemical
bread - physical
roasting - chemical
egg - chemical
fireworks - chemical
mixing something with water - chemical
popcorn - chemical
colouring hair - physical
melting chocolate - physical
crumpled paper - physical
rusted nails - chemical
crushed can - physical
cooked egg - chemical
bending metal - physical
melting ice - physical
bleaching clothes - chemical
If u want to differentiate between chemcial and physical change u need to remember this-
physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper
chemical change - a new substance is formed
aluminum can be used to make soft drink cans because of which property?
A. It can be hammered into a thin sheet (malleability)
B.it can reflect light (shininess)
C.It can be drawn into long wires(ductility)
Answer:
A
Explanation:
Malleability describes the property of a metal's ability to be distorted below compression. It is a physical property of metals by which they can be hammered, shaped and rolled into a very thin sheet without rupturing. A soda can's walls are very thin, and therefore express the malleability of aluminum.
What is it about water that makes it able to dissolve both polar covalent and iconic substances
Answer:
A solvent is simply a substance that can dissolve other molecules and compounds, which are known as solutes. ... Because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.
Explanation:
calculate mass in grams of 5.09×10^20 atoms of copper. (Atomic Mass 63.5)
Explanation:
here is the answer attached
why is it that lipids, such as oil, do not readily mix with water?
Answer:
Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water s hydrogen bonds.Water will not do this so the oil is forced to stay separate from the water.
Oil are the lipid molecule do not Mix With Water Because of Polarity. Oil and water don’t mix as it is made up of non-polar molecules while water molecules are polar.
what are the composition of lipid ?Lipids are organic biomolecule made up of carbon, hydrogen and oxygen with some other elements like phosphorus and nitrogen may be present.
A fatty acid which is an organic acid having hydrogen and general formula R-COOH where R represents hydrogen or a group of carbon and hydrogen atoms, for example stearic, palmitic and oleic acids.
Glycerol is another component which is a thick sweetish liquid, soluble in water and can react with a fatty acid. where one molecule of glycerol combines with three molecule is fatty acids by formation of a bond called ester, here ester is also known as triglyceride.
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16 A particular light source gives off light waves with a measured wavelength of 2.0 x 10-7 m.
What is the frequency of the light source?
А 6.67 X 10-15 Hz
B 6.0 x 1011 Hz
с 1.5 x 1015 Hz
D Not enough information
Refer to the attachment
Light waves are part of the electromagnetic spectrum. The frequency of light therefore is 1.5 * 10^15 Hz.
What is light?
Light is an electromagnetic wave and we know that the speed of light is a constant which is 3 * 10^8 m/s.
Knowing this; v = λ * f
λ = wavelength
f= frequency of light
v = seed of light
f = v/λ
f = 3 * 10^8 m/s/2.0 x 10-7 m
f = 1.5 * 10^15 Hz
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feeling generous today thank you guys so much
Answer:
16
Explanation:
you can line up the fareinheit and celsius and see that the celsius is 16
Answer:
15 and 290 for the first question, if it drops 30 it will get to be 30 f, -0 c and 273 k
HAve a wonderful day!
Which statement accurately describes the bond that forms between carbon and oxygen to create carbon dioxide
Answer:
the bond that forms between carbon and oxygen to create carbon dioxide
A polar covalent bond
What happens if metal is in acid?
I'm having a blank
Answer:
it dissolves or disintegrates
Explanation:
When acids dissolve in water, what is released into the resulting solution?
H+ and OH-ions equally
H+ (hydrogen) ions
OH- (hydroxide) ions
Answer:
H+ (hydrogen) ions
Explanation:
Answer:
H+ (hydrogen) ions
Explanation:
A can of hairspray is crushed down to half its normal volume. What will
happen to the pressure in the can if temperature does not change? *
O it is reduced by half.
O it doubles.
O It stays the same
Answer:
pressure doubles
Explanation:
they are inversly preportional
Help meeeeeeeeeeeeeee
AMSWER :
CHEMICAL FORMULA :
• WATER - H2O
• CARBONDIOXIDE - CO2
• SODIUM HYDROXIDE - NaOH
• SULPHURIC ACID - H2SO4
• SODIUM CHLORIDE - NaCI
• SODIUM BICARBONATE - NaCHO3
The speed of light is 300,000,000 m/s. What is the frequency of a wave with a wavelength of 6 meters?
Answer:
50,000,000 Hz
Explanation:
Rearrange the formula:
wave speed = frequency × wavelength → frequency = wave speed ÷ wavelength
wave speed = 300,000,000m/s
wavelength = 6m
Substitute in the values:
frequency = 300,000,000 ÷ 6
frequency = 50,000,000 Hz
Hope this helps!
which element has the highest monetary value?
A) gold
B) Silver
C) nickel
D) lead
Earth science
Help plz!
Which piece of information could a person obtain from a contour map?
1.the mineral composition of a mountain
2. the elevation of a mountain 3.the speed of water flow in a river
4.the amount of water in a river
Answer:
2 Elevation of a mountain.
Explanation:
Contours make it possible to show the height and shape of mountains, the depths of the ocean bottom, and the steepness of slopes.
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Which choice can be classified as a pure substance?
A. heterogeneous mixture
B.solution
C. Homogeneous mixture
D. compound
Answer:
d. compound
Explanation:
compound and elements are pure substances
i don't need to know why i just want the awnser
Answer:
I remember doing this in 7th,
1. D
2. B or D, more leaning on B though
3. A
On the 14 point pH scale, soaps and cleaning solutions are typically -
Question 7 options:
8-14
7
Answer:
I believe the answer is ;_; 8-14
Im sorry if im wrong
Answer: 8-14 is the right answer
Explanation:
A____ and _______ takes the shape of their containers
Answer:
liquid
gas
Explanation:
liquid has an indefinite shape
gas has an indefinite shape
Answer:
gas and liquid
Explanation:
gas and liquid flow around and take the shape of their containers because the molecules are more spread apart
CONNECT IT
Relate how a household sponge and water can be used to model
the concept of an unsaturated solution, a saturated solution, and a supersaturated
solution.
The sponge is unsaturated when it is taking in more water. It becomes saturated when it stops taking in water. It is supersaturated when water starts oozing out from the sponge.
A saturated solution contains just as much solute as it normally hold at a particular temperature. An unsaturated solution contains less solute than it can normally hold at a particular temperature. A supersaturated solution contains more solute than it can normally hold at a particular temperature.
We can use a sponge to model these three scenario as follows;
Water continues to enter into the sponge when it is unsaturated, this continues until the sponge becomes saturated with water and takes in no more water. When the sponge becomes supersaturated, water begins to ooze out from the sponge because it can no longer hold more water.
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What letter represents the critical temperature?
Answer:
b
Explanation:
why is stability of compounds essential
Answer:
chemical stability is important to consider in the comprehensive assessment of pharmaceutical properties, activity, and selectivity during drug discovery.
Answer:
In general, molecules are stable because all their constituent atoms have sufficient "valence" electrons-that is, electrons that participate in chemical bonding. Such electrons reside in the outer, or valence, "shell," which must fill up with the appropriate number of electrons for the bound atoms to be come stable.
Explanation:
what is the potential energy of a 3 kg box lifted to 12.5 meters high?
Answer:
367.5 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 3 × 9.8 × 12.5 = 367.5
We have the final answer as
367.5 JHope this helps you
Give example of 1 solid, 1 liquid and 1 gas solution.
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