Explanation:
E = hf
c= f × lamda
f= c/ lamda
c= speed of light
f= frequency
lamda = wavelength
E = h c/ lamda
E = 6.626 × 10^-34 Js × 3 × 10^8 ms-1 / 589 × 10^-9 m
= 3.37 × 10^15 J
How much Ba(OH)2, in grams, is needed to make a 1.00m aqueous solution?
Answer:
We can say that we need 171 g barium hydroxide needed to make one model equals solution.
Explanation:
I hope this answered your question.
What two things does pure substances have?
a.) Different chemicals and different properties.
b.) Same chemicals and different chemical properties.
c.) Same chemicals and same physical properties.
d.) Same chemicals and same chemical properties.
list several characteristics of ligroin
- Petroleum fraction consisting mostly of [tex]C_{7}[/tex] and [tex]C_{8}[/tex] hydrocarbons
- The fraction is also called heavy naphtha
- Boiling in the range 90‒140 °C
- Ligroin is used as a laboratory solvent
- Ligroin it also esed as a motor fuel or as a solvent for fats and oils in dry cleaning
[] All of these are different characteristics of ligroin
[] If you need more let me know
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- Heather
What type of mixture is this illustration?
Answer:
Suspension
Explanation:
It's a suspension because it is not mixed at all, and has distinctly separate layers.
PLEASE ANSWER WITHIN THIS HOUR!
Which of the following does NOT describe the epidermis?
A. It is waterproof.
B. It houses the sweat and oil glands.
C. It is the outermost layer of the skin.
D. Its surface consists of dead cells that continually shed off.
Thank you!
Answer:
it doesn't house the sweat and oil glands
Explanation:
the epidermis doesn't house the oil and sweat glands but the dermis does
Determine the wavelength of a radio station transmitting a broadcast at 520 Megahertz.
The wavelength of the radio station broadcasting at 520 megahertz is 0.58m.
HOW TO CALCULATE WAVELENGTH:
The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency as follows:λ = v/f
Where;
v= velocity of the wave (3 × 10⁸m/s)f = frequency (Hz)According to this question, a radio station is transmitting a broadcast at 520 Megahertz. The wavelength is calculated as follows:λ = 3 × 10⁸ ÷ 5.2 × 10⁸λ = 0.577 × 10⁸-⁸λ = 0.58mTherefore, wavelength of the radio station broadcasting at 520 megahertz is 0.58m.Learn more at: https://brainly.com/question/19601903?referrer=searchResults
Hi I of the following compounds is an aldehyde?
Answer:
cpd 2
Explanation:
aldehyde is such a cpd which contains an alkyle gp with the formula R-CH=O
Functional group can be interconverted into each other by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. Therefore the correct option is option 2 that is having group R-CHO.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry.
The list of functional groups with their corresponding formulas can be given as
Carboxylic group COOH
Alcoholic group OH
Ammine group NH₂
Ketonic group R-CO_R
Aldehydic group R-CHO
Thiol group R-S-H
Cyanide group -CN
Therefore the correct option is option 2 that is having group R-CHO.
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An ideal solution consisting of 79 wt% benzene (C6H6) and 21 wt% toluene (C7H8) was heated in a closed vessel to 50 ºC. What is the mole fraction of benzene in the vapour phase when equilibrium was reached at 50 ºC? Round your answer to two significant figures.
Data: Vapour pressure of benzene at 50 ºC = 271 mmHg
Vapour pressure of toluene at 50 ºC = 91.5 mmHg
In this case, according to the Raoult's law, we can find the mole fraction of 79 wt% benzene and 21 wt% toluene at 50 °C in the vapor phase as follows:
[tex]y_iP=x_iP_i[/tex]
However, we first have to calculate the mole fractions in the solution as follows (b stands for benzene and t for toluene):
[tex]\\x_b=0.79\frac{g\ benzene}{g\ solution} *\frac{(78.11*x_b+92.14*x_t)}{1mol\ solution} *\frac{1mol\ toluene}{78.11g\ toluene} \\\\x_b=0.79\frac{g\ benzene}{g\ solution} *\frac{78.11*x_b+92.14*(1-x_b)}{1mol\ solution} *\frac{1mol\ toluene}{78.11g\ toluene}\\\\x_b=0.79*(x_b+1.18*(1-x_b))\\\\x_b=0.79x_b+0.932-0.932x_b\\\\x_b=\frac{0.932}{1+0.932-0.79} =0.816\\\\x_t=1-x_b=1-0.816=0.184[/tex]
Next, we calculate the total pressure as follows, according to the Dalton's law:
[tex]P=x_bP_b+x_tP_t=0.816*271mmHg+0.184*91.5mmHg=237.972mmHg[/tex]
Finally, the mole fractions of the vapor phase turn out:
[tex]y_b=\frac{0.816*271mmHg}{237.972mmHg}=0.929\\\\y_t=1- 0.929=0.071[/tex]
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https://brainly.com/question/12718562https://brainly.com/question/17581597A student experimentally determines the gas law constant, R, by reacting a small piece of magnesium with excess hydrochloric acid and then collecting the hydrogen gas over water in a eudiometer. Based on experimentally collected data, the student calculates R to equal 0.0832
Due to errors in volume and moles measurement by the student, the true value of the molar gas constant is less than the obtained value.
The Percent error is 1.39%
What is percent error?Percent error is defined as the ratio of error and true value of a measurement expressed as a percentage.
Percent error = (error/true value) × 100%Error = |true value - measured value|
The error in the students measurement = |0.08206 - 0.0832|
Error = 0.00114
Percent error = (0.00114/0.08206) × 100%
Percent error = 1.39%
The formula to determine the molar gas constant R is given below:
[tex]R = \frac{PV}{nT}[/tex]
Since the student value is higher than the true value, the possible sources of error include:
The student student does not equilibrate the water levels within the eudiometer and the beaker at the end of the reaction resulting in increased volumeThe student does not clean the zinc with sand paper, thus the number of moles of hydrogen gas produced is less than the actual value.Therefore, the true value of the molar gas constant is less than the obtained value.
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11)
is the large-scale farming that mass-produces crops and livestock.
a) Organic farming
b) Industrial farming
c) Chemical farming
Answer:
b) Industrial farming
Explanation:
The term “industrial agriculture” refers to the type of farming which raises and cultivates large numbers of livestock and plants in high-density environments. It uses modern technology to promote faster growth and reduce illness and death rates in livestock, creating food products on a mass scale.
Answer: B.
Explanation
industrial agriculture
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Consider the following reaction: 2A + 3B --> 2C If you have 2 moles of A and 6 moles of B, what is the maximum number of moles of C that can be made by the reaction
Answer:
2 moles of C and no more
Explanation:
Consider the following reaction: 2A + 3B --> 2C If you have 2 moles of A and 6 moles of B, what is the maximum number of moles of C that can be made by the reaction
2A + 3B --> 2C '
2 of A make 2 of C if we have atleast 3 of B.
we ave more than enough B
2 of A will make 2 moles of C and no more
What is a object that produces heat by producing light please?
Answer:
A light bulb im guessing
Answer:
light bulb
Explanation:
when a light bulb is producing light it gets hot if you touch a light bulb while you will fill the heat
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How many Moles of glucose are produced from 12 moles of CO2 in photosynthesis?
Answer:
2 MOLES OF GLUCOSE
Explanation:
How many Moles of glucose are produced from 12 moles of CO2 in photosynthesis?
6CO2 +6H20-------------->C6H12O6 -+ 6O20
(IN THE PRESENCE OF CHLOROPHYLL AND UV FROM )
)
6 MOLES OF CO2 MAKE 1 MOLE OF GLUCOSE
12 MOLES THEN MAKE 2 MOLES OF GLUCOSE
In the photosynthesis process, plants can use 12 moles of carbon dioxide to form 2 moles of glucose.
What is photosynthesis?It is the process by which green plants and some other organisms convert light energy into chemical energy.
Let's consider the balanced equation for the synthesis of glucose through photosynthesis.
6 CO₂ + 6 H₂O ⇒ C₆H₁₂O₆ + 6 O₂
The molar ratio of CO₂ to C₆H₁₂O₆ is 6:1. The moles of glucose formed from 12 moles of carbon dioxide are:
12 mol CO₂ (1 mol C₆H₁₂O₆/6 mol CO₂) = 2 mol C₆H₁₂O₆
In the photosynthesis process, plants can use 12 moles of carbon dioxide to form 2 moles of glucose.
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Very easy science 5th grade WILL MARK As brain list if owned by today
Answer:
A
Explanation:
According to the chart, A tv turns into heat, light, and sound energy.
I need this done soon!
What is a saturated solution?
A. A solution with as much dissolved solute as it can hold at a given temperature.
B. A heated solution with more dissolved solute can hold at a lower temperature.
C. A solution that holds less dissolved solute than is possible at a given temperature.
D. A solution that holds as much solvent as possible at all temperatures.
Answer: A
Explanation:
A saturated solution is a chemical solution that contains the highest bound solvent level. In a saturated solution, the extra solution will not dissolve. Depending on a multitude of variables, the quantity of fluid that can we can add in a solvent to create a saturated solution.
A cylinder contains helium gas with a volume of 2.60 L at 20 C and 768 mm Hg. If the balloon ascends to an altitude where the helium pressure is 614 mm Hg, what is the volume of gas? (Assume the temperature has not changed)
a. 12.2
b. 1.2
c. 20.2
d. 3.2
Answer: 3.2 [D]
Explanation:
Use Boyles law
(Might want to rotate image, sorry!)
What is the molality of sodium chloride in solution that is 13.0% by mass sodium chloride and that
the solution has a density of 1.10 g/mL?
Answer:
2.4 M
Explanation:
1. Suppose you have 100 mL solution:
Use density to find grams of solution:
100 mL solution x (1.10 g / 1 mL) = 110 g solution
2. FInd the amount of sodium chloride pure:
110 g solution x(13 g NaCl / 100 g solution) = 14.3 g NaCl
3. Change grams to mol:
14.3 g NaCl x ( 1 mol NaCl/ 58.44 g NaCl) = 0.24 mol NaCl
4. Molarity:
M = mol NaCl / L solution
M = 0.24 mol NaCl / 0.1 L = 2.4 M
what is the chemistry
Answer:
physical science
According to 2 sources
Chemistry is a physical science Chemistry is typically considered a physical science, as defined by the Encyclopedia Britannica, because the study of chemistry does not involve living things. Most of the chemistry involved in research and development, such as making new products and materials for customers, falls within this purview.
Explanation:
PA BRAINLIEST
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Help please :) with this
Answer:
The answer is 3
Explanation:
Hope this helps and have a wonderful day.
What happens to iron in a bolt as the bolt rusts?
A. It undergoes a chemical change.
O B. It undergoes a physical change
O C. The mass of the atoms decrease
O D. It changes into a different element.
a
Answer:
it undergoes a chemical change
A student performs titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant. How will his experimental error affect the calculated value for the concentration of unknown acetic acid
Answer:
A student performed titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant.
Explanation:
hope it helps you
Which of the sequence best describe how a piece of chicken nugget is digested in the human body?
mouth, esophagus, small intestine, large intestine, stomach
mouth, esophagus, small intestine, large intestine, stomach
mouth, stomach, small intestine, large intestine, esophagus
mouth, stomach, small intestine, large intestine, esophagus
mouth, esophagus, stomach, small intestine, large intestine
mouth, esophagus, stomach, small intestine, large intestine
None of the above
The sequence for the disgestion of a piece of chicken nugget in the human body is: C. mouth, esophagus, stomach, small intestine, large intestine.
What is digestion?Digestion can be defined as a form of catabolic activity that involves the breaking down of food into smaller sizes that can be absorbed as nutrients by the body of a living organism while releasing energy through the process.
Based on the digestive system, the sequence for the disgestion of a piece of chicken nugget in the human body are:
MouthEsophagusStomachSmall intestineLarge intestineRead more on disgestion here: https://brainly.com/question/22686081
The metallic character of an element is defined as the properties typical of a metal, especially the tendency to lose electrons in chemical reactions.
Arrange the following elements in order of decreasing metallic character.
P, Zn, Cr, Cs, F, S, Ca
Rank from most to least metallic character. To rank items as equivalent, overlap them.
Answer:
Rb, Zn, P, S, F, Ca, Co, Cr
Rb, Zn, P, S, F, Ca, Co, Cr elements in order of decreasing metallic character.
What is a metallic character?The metallic character of an element is defined as the properties typical of metal, especially the tendency to lose electrons in chemical reactions.
Metallic character depends on the ability of an element to lose its outer valence electrons. Examples of properties related to metallic character include thermal and electrical conductivity, metallic lustre, hardness, ductility, and malleability. The most "metallic" element is francium, followed by caesium.
Hence, Rb, Zn, P, S, F, Ca, Co, and Cr elements in order of decreasing metallic character.
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Which of the following frequencies of light has the lowest energy?
Answer:
Radio waves have photons with the lowest energies. Microwaves have a little more energy than radio waves. Infrared has still more, followed by visible, ultraviolet, X-rays and gamma rays.The content of ethanol or alcohol for alcoholic beverage is measured with alcohol proof. A 750 mL bottle of vodka is labeled as 60 proof. What is its alcohol content?
The alcohol content is 450 proof
In the given example, the measurement of the alcohol content is said to be measured in alcohol proof.
If the volume of the vodka = 750 mLWe are going to multiply the given proof of the alcohol with the vodka drink divided by 100 to determine the content of alcohol in the alcoholic beverage.
i.e.
= (750 × 60)/100 proof
= 450 proof
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help! giving brainliest
Answer:
sorry wala din akong sagot niyan sorry talaga
plss anwer my question
brainliest for who answers my questions
Answer:
13.C
14.B
15.C
16.Chemical element
Chemical Element are called substance or element that cannot be decomposed or broken down into simpler substances by ordinary chemical process.
Chemical elements are those elements which cannot be chemically broken down into simpler substances and are primary constituents of all matter. They are fundamental ingredients of all matter in existence which can be combined in reaction to create chemical substance each chemical element in the universe has unique properties that distinguish it from all of the Other chemical elements. For example hydrogen is an element.
Hope that helps
Seratonin is a neurotransmitter. The ratio of C atoms to N atoms is____
Answer:
5:1
Explanation:
The molecular formula of serotonin is C10H12N2O. Therefore, the ratio of C atoms to N atoms is 5:1, because you divide 10 and 2 by 2, and then you get 5:1.
A very long tube with a cross-sectional area of 1.00 cm2 is filled with mercury to a height of 76.0 cm. At what height would water stand in this tube if it were filled with a mass of water equal to that of the mercury? (The density of mercury is 13.60 g/cm3 and the density of water is 1.00 g/cm3.)
The water would stand at a height of 1033.6 cm
If the mass of the mercury, m equals the mass of the water, m' at its height,h', then the weight of the mercury W equals the weight of the water, W'
So, W = W'
mg = m'g
ρV = ρ'V' where ρ = density of mercury = 13.60 g/cm³, V = volume of mercury = Ah where A = cross-sectional area of tube = 1.00 cm and h = height of mercury = 76.0 cm, ρ' = density of water = 1.00 g/cm³, V = volume of water = Ah' where A = cross-sectional area of tube = 1.00 cm and h' = height of water.
So, ρV = ρ'V'
ρAh = ρ'Ah'
h' = ρAh/ρ'A
h' = ρh/ρ'
Substituting the values of the variables into the equation, we have
h' = ρh/ρ'
h' = 13.60 g/cm³ × 76.0 cm/1.00 g/cm³
h' = 13.60 × 76.0 cm
h' = 1033.6 cm
So, the water would stand at a height of 1033.6 cm
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draw clear, colorful and understandable diagrams of the metabolism of carbohydrates and lipids?
(you can have 2 separate ones, or you can combine them into one)
Answer:
Refer to the attachments!!
Explanation: