Answer: 410 nm
Explanation: Energy of a photon is E = hf = hc/λ. The smaller wavelength λ, the greater energy
Someone please help me
Answer:
Newton's first law.
Explanation:
It is the same as law of inertia.
why do we need to rinse the mouth before collecting the saliva
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(11) Deduce the number of dyes in food colouring H.
(iii) Suggest why food colouring F does not move during the experiment.
(iv) Explain which two food colourings contain the dye that is likely to be the most soluble the solvent.
(b) Determine which food colouring contains a dye with R, value closest to 0.67
Show your working.
Answer:
(ii) 1 dye
(iii) Food coloring F is insoluble in the solvent
(iv) 'E' and 'H'
(b) Food colouring G
Explanation:
Paper chromatography principle is based on the rates of migration of chemicals across a sheet of paper which are different and it consists of a stationary phase such as the water in the paper and a mobile phase such as the solvent resulting in the partitioning of the components of the mixture across the paper
The solution components are positioned to start in one place from where they migrate and separate out on the chromatography paper
(ii) The number of components into which the food colouring 'H' separates into = 1
Therefore, the number of dyes in food colouring 'H' = 1 dye
(iii) Food coloring 'F' does not move because it is insoluble in the solvent, which is the mobile phase
(iv) The food colouring that contains the dye that is likely to be most soluble in the solvent are does for which the dyes travel furthest, which are;
Food coloring 'E' and 'H'
(b) Using a similar question solution found on 'tutor my self' website, we have;
The [tex]R_f[/tex] values are given as follows;
[tex]R_f = \dfrac{Distance \ moved \ by \ dye}{Distance \ moved \ by \ solvent}[/tex]
The distance moved by the solvent = 5 units
The distance moved by dyes in food colouring 'E' and 'H' = 4 units
The distance moved by dye in food colouring 'G' = 3.3 units
The distance moved by the second dye in food colouring 'E' = 2.7 units
By inspection, we get;
[tex]R_f[/tex] dye in food colouring 'G' = 3.3/5 = 0.66,
Therefore, the dye with [tex]R_f[/tex] value closest to 0.67 is the dye in food colouring 'G'.
Which phase change is not associated with gases?
Answer: depositing
Explanation:
What would be the likely pH of a weak dilute base?
6. If the pressure of a gas is 1.01 atm and the temperature is 25°C, then if the pressure is increased to 1.10, what is the new temperature?
Answer:
324.554 K
Explanation:
Which can be converted back to °C by subtracting 273
Once again thus answer can be found using the gas law P1/T1 =P2/T2
Remember to convert to Kelvin before doing the calculations by adding 273
Which of the following represents C4H10?
Answer:
C.
Explanation:
C represents butane ([tex]C_{4} H_{10}[/tex])
The statement, that describes the following represent C₄H₁₀ is "C."
What is C₄H₁₀?Butane, often known as n-butane, is an alkane having the formula C₄H₁₀. At room temperature and atmospheric pressure, butane is a gas. Butane is a highly flammable, colourless gas that vaporises quickly at ambient temperature.
Butane is derived from the root but- and the suffix -ane. It is a straight chain alkane with four carbon atoms. That is, the C₄H₁₀ structure has four carbon atoms bonding with ten hydrogen atoms, all of which are bonded with single bonds.
Hence the correct option is C.
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How many fluorine atoms are present in 125.0g of phosphorus pentafluoride?
molar mass of PF5 = 125.966 g/mol
125 g PF5 × (1 mol PF5/125.966 g PF5) = 0.992 mol PF5
0.992 mol PF5 × (6.022 × 10^23 molecules PF5);
= 5.97 × 10^23 molecules PF5
Since there 5 fluorine atoms per molecule of PF5,
(5.97.× 10^23 molecules PF5) × (5 atoms F/1 molecule PF5)
= 2.99 × 10^24 atoms F
Which of the following statements describes a REACTANT and where they are
chemical equation?
The chemicals that
you begin with, found
on the right side of the
equation
The chemicals that The chemicals that The chemicals that
you begin with, found end with, found on the you enyi with, found or
on the left side of the left side of the the right side of the
equation
equation
equation
Music of
Answer: The statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.
Explanation:
An equation that includes symbolic formulas and represents chemical reaction between the substances initially present forming new substances is called a chemical equation.
For example, [tex]N_{2} + 3H_{2} \rightarrow 2NH_{3}[/tex]
Here, substances [tex]N_{2}[/tex] and [tex]H_{2}[/tex] are the reactants. Reactants in a chemical equation are always present on the left side as these are the chemicals we begin with.
Also here, [tex]NH_{3}[/tex] is the product. Product(s) in a chemical equation are always present on the right side as these are the chemicals we end with.
Thus, we can conclude that the statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.
what state of matter is water
Answer:
water is liquid state of matter
Which of the following describes a characteristic of water that makes it cohesive in nature?
O It is a non-polar molecule with weak hydrogen boding.
O It has a linear molecular structure with H-O-H arranged in a straight line.
O It has a huge electronegativity difference between its atoms.
O It requires a high amount of heat to raise or drop its temperature.
Answer:
it has a huge electronegativity difference between it's atoms
The characteristic of water that makes it cohesive in nature is,
It has a huge electronegativity difference between its atoms.So, option C is correct one.
Why water is cohesive in nature?The water molecule contains two hydrogen atoms and oxyegen atom. The electronegativity of hydrogen atoms and oxyegen atom is 2.1 and 3.44Due to high electronegativity of oxygen ,it can attract the bonded pair of electron of hydrogen and form a strong bond and make it cohesive in nature.What are major characteristics of water?The water molecule have unique characteristics among all some are given below.
Water is polar, with partial positive charge on two hydrogen and partial negative charge on one oxygen.Water is act as solvent and dissolves the polar and ionic substance.Water has high heat of vaporization.Water has cohesive and adhesive properties.Water has high heat capacity.learn about water molecule,
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Drag the slider from January to December. Based on what you observe, do you think Barcelona has large temperature changes throughout the year?
Answer:
Yes.
Explanation:
Yes, I think that Barcelona has large temperature changes throughout the year because Barcelona has minimum temperature of 33°F in winter season and maximum temperature of 88°F in summer season. In Barcelona, the summers are short, warm, and humid while on the other hand, the winters in Barcelona are long, cold, and partly cloudy. The temperature typically varies from 40°F to 83°F and is rarely goes below 33°F or above 88°F.
Which of the following best describes a binary compound?
I. It is always made up of a metal and a nonmetal.
II. It always ends with -ide.
III. It always uses the Greek prefixes.
Answer:
metal and nonmetal it always include
What is the hottest material on earth
Find the density of 250 mL (volume) soy milk which has a mass of 276.3 grams. Use the density equation (mass ÷ volume).
Answer:
density =mass/volume
=276.3/250
=1.105g/ml
Which two parts do the capillaries surround? *
How many liters of a 6.0 M solution of acetic acid contain 0.0030 moles
Answer: Least Common Multiplier of a6m, 0.003 moles 0.01elamos
Steps 6m, 0.003 moles
Compute an expression comprised of Factors that appear either in a6m or 0.003 moles
= 0.018elamos
Explanation:
Taking into account the definition of molarity, 0.005 liters of a 6.0 M solution of acetic acid contain 0.0030 moles.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume} [/tex]
Molarity is expressed in units [tex]\frac{moles}{liters} [/tex].
This caseIn this case, you have a 6.0 M solution of acetic acid that contain 0.0030 moles. Replacing in the definition of molarity:
[tex]0.6\frac{moles}{liters} =\frac{0.0030 moles}{volume} [/tex]
Solving:
0.6 [tex]\frac{moles}{liters} [/tex]× volume= 0.0030 moles
volume= 0.0030 moles ÷0.6 [tex]\frac{moles}{liters} [/tex]
volume=0.005 liters
Finally, 0.005 liters of a 6.0 M solution of acetic acid contain 0.0030 moles.
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Using the following equation
Pb(SO4)2 + 4 LiNO3 à Pb(NO3)4 + 2 Li2SO4
How many grams of lithium nitrate, LiNO3, will be needed to make 7.14 grams of lithium sulfate, Li2SO4, assuming that you have an adequate amount of lead (IV) sulfate, Pb(SO4)2, to do the reaction?
Answer: _____ rams LiNO3 (Round your answer to the nearest hundreths)
Answer:
.-.
Explanation:
Un vehículo inicia su recorrido desde el reposo, al cabo de 30 segundos tiene una velocidad de 120 m/s. ¿Cuál es la aceleración que trae dicho vehículo?
Explanation:
KTLDÖDUÖOQO5SKDXBBCMCNXYLZD
If a solution has a [H+] of 9.3x10-11, what is the pH?
Answer:
10.03Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(9.3 \times {10}^{ - 11} ) \\ = 10.0315...[/tex]
We have the final answer as
10.03Hope this helps you
classify the following alcohols as primary secondary and tertiary alcohols?
What is the molar mass of potassium bromide, KBR?
Answer:
id.............k
Explanation:
Answer:
119.002 g/mol
Explanation:
---------
When bacteria have multiplied at least 1000 times, what is the pattern of growth that can be seen with the naked eye is called?
cluster
colony
family
clump
Answer:
Colony
Explanation:
3- Gas in a piston has a volume of 6.6 L, a temperature of 115 °C. If the final
temperature is 173 °C, what will the final volume be?
a- 4.38 L
b- 9.9 L
C-5.47 L
d- 7.58 L
Answer:
d- 7.58 L
Explanation:
According to Charles's law, the temperature in Kelvin is proportional to the volume of a dry gas when the pressure is constant.
Mathematically, V1/T1 = V2/ T2
V1= initial volume= 6.6 L
T1= Initial temperature= 115 °C= (115 °C +273)=388K
V2= final volume
T2= final temperature= 173 °C= ( 173 °C+ 273)= 446K
Substitute the values,
V2=( V1 × T2)/ T1
= (6.6×446)/388
= 2943.6/388
= 7.6L
Based on your conductivity values, do the Group A compounds appear to be molecular, ionic, or weak acids? Would you expect them to partially dissociate, completely dissociate, or not dissociate at all ?
Answer:
See Explanation
Explanation:
If we consider the conductivity values of group A compounds, we will notice that all group A compounds all possess a very high conductivity values each.
These high conductivity values are consistent with ionic compounds which completely dissociate in solution thereby making mobile ions available.
Hence, group A compounds are ionic and completely dissociate in solution.
If I have 30 liters of gas held at a pressure of 3.4 atm and a temperature of 225 K, how many moles of gas do I have? 5.52 mol
Answer:
234 atm
Explanation:
small band of frequencies the retina of the eye responds to
-radio waves
-microwaves
-infrared waves
-visible light
-ultraviolet rays
-x-rays
-gamma rays
-cosmic rays
Answer:
Visible light
Explanation:
our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum. Visible light.
Answer:
Visible light.
Explanation:
It says visible as in visible to us we cant see the others or they would also be called visible light.
"The pH of an acid has nothing to do with the strength of the acid."
Explain why this statement is true. Include the following terms in your explanation
• dissociation
molarity
• strong
• weak
• neutral
• acidic
basic
Answer:The relationship between acid strength and the pH of a solution. ... Typical concentrations of these ions in solution can be very small, and they also ... Acidic solutions have pH values less than 7, and basic solutions have pH values ... p, O, H, end text, it is a little more common to use pH \text{pH} pHstart text, p, H, end text.
Explanation:Therefore a strong acid will contribute more H+ ions than a weak acid. Therefore, the pH of a strong acid solution will be higher than a weak acid solution.
Thave 7.6 x 1023 particles of neon. How many moles of neon do I have?
Answer:
1.26moles
Explanation:
To get the number of moles (n) in an element, we divide the number of molecules of the element by Avagadro number (6.02 × 10^23)
n = no. of molecules ÷ nA (6.02 × 10^23)
According to this question, number of molecules of Neon (Ne) is 7.6 x 10^23 particles.
n = 7.6 x 10^23 ÷ 6.02 × 10^23
n = 7.6/6.02 × 10^(23-23)
n = 1.26 × 10^0
n = 1.26moles
Why does the earth rotate
A:because it’s formed from cold gases collapsing due to gravity
B: Because the matter in the nebula that formed
C:Because the earth form is more than 99% of the mass of the Solar system
D; Because the hydrogen Adams inside the nebular fuse to form helium
Answer:
A
Explanation:
Your answer would be A because Earth is formed from cold gases collapsing due to gravity. The Solar System was formed when a huge amount of dust and gas began to collapse under its own gravity, and as the cloud collapse it started to spin causing the material within the cloud to gather into a swirl and then formed into planets and as the planets are formed they kept this spinning motion.