In chromatography,when all the three samples have atleast one substance common it is indicated by Rf values which are same for the 3 samples as they have one substance common in them.
What is chromatography?Chromatography is a separation technique which is generally used for separating substances based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.
The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.
The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.
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Which structure is responsible for producing pollen in flowering plants?
Answer:
The stamen!
The stamen is often made up of anthers and filaments
___________ mL = 2.2 L
Answer:
2,200 mL I believe it is.
Answer:
2,200 is the answer of your question
Does this particle diagram represent an element, compound, or mixture?
Answer:
Yes, it's a mixture as more than 1 type of molecules are present!!
What is the manipulated variable, responding variable, and controlled Variable
observe different electrolytes in a wet cell that will light a
bulb most brightly.
Answer:
Manipulated/independent variable- DIFFERENT ELECTROLYTES
Responding/dependent variable- BRIGHTNESS OF BULB
Controlled variable- WET CELL
Explanation:
The independent variable, also known as manipulated variable is the variable that the experimenter changes or manipulates in an experiment. In this case where different electrolytes are observed to see which will light a bulb most brightly, the manipulated variable is the DIFFERENT ELECTROLYTES.
Dependent or responding variable is the variable of an experiment that responds to the changes made to the independent variable. It is the variable that is being measured in an experiment. In this case, the BRIGHTNESS OF BULB is dependent on the electrolyte used, hence, it is the responding variable.
Controlled variable or constant is the variable that the experimenter keeps the same throughout the experiment. In this case, the WET CELL is kept constant for all the electrolytes used i.e. it is not changed, hence, the WET CELL is the controlled variable.
2) Check all that apply.
What are the three major groups of elements?
Answer:
metals, nonmetals and metalloids
Explanation:
A bond between two iodine atoms would have what as the percent ionic character
A. 53%
B. 83%
C. 0%
D. impossible to calculate
Answer:
Your answer should be 53%
I'm very sorry if I'm wrong I have not done this in forever
Explanation:
No explanation
Name the two minerals involved in the formation of wollastonite
How many elements are in (NH4)3PO4
Answer:
4
Explanation:
There are 4 different elements in the compound (N, H, P, O) but if you want to count the number of each element then the answer is different.
In NH4, theres 1 N and 4 H, but since there are 3 NH4s then u have 3 N and 12 H. There's 1 P and 4 Os as well.
Added together u have 3 + 12 + 1 + 4 = 20 elements in total.
hope this helps!
Where is carbon dioxide and oxygen exchanged at capillaries?
Answer:
Gas exchange takes place in the millions of alveoli in the lungs.
Explanation:
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Name the bond between atoms that share electrons
What is a molecule
Give five examples of molecular elements
Draw a diagram to show the bonding in
Carbon dioxide Methan
hydrogen chlorine
Answer:
1) Covalent bond, in chemistry, the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.
2)A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
3)Hydrogen (H2), oxygen (O2), and chlorine (Cl2) molecules, for example, each contains two atoms. Another form of oxygen, ozone (O3), has three atoms, and sulfur (S8) has eight atoms. All elemental molecules are made of atoms of a single element.
Explanation:
PLEASE MARK ME AS BRAINLIEST
What did Albert Einstein say was the nature of electromagnetic radiation?
Answer:
Albert Einstein proposed the wave-particle theory of electromagnetic radiation. This theory states that electromagnetic energy is released in discrete packets of energy—now called photons—that act like waves.
define Common ion effect
Draw a model to represent the physical property of metals known as ductility, or the ability to be drawn into a wire.
The model that represents the physical property of metals known as ductility can be seen in the image attached below.
Metals are substances that are good conductors of heat and electricity.
The term ductility is a characteristic of metal and it explains the ability of metals to be drawn into wire. it implies that metal materials can be hammered and beaten into tiny sheets of wires.
The model in the image attached below shows how gold which is metal is drawn into wires.
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How is the earth's crust different from the mantle?
A : The crust is deeper below Earth’s surface than the mantle
B : the crust is less dense than the mantle
C : the crust contains softer rock than the mantle
D : the crust is made of more iron than the mantle
( this is science by the way )
Answer:
the answer is B
Explanation:
please tell if correct or not and can you give brainliest
Answer:
well i would say D
Explanation:
the crust in fact does have more iron within in it but if i describe it more i would say the crust is a smaller amount then the mantle, and that its a bit harder material then the mantle itself
How many layers of paint are there on the typical manufactured vehicle?
Answer:
3 sometimes 4
Explanation: there are usualy
3 layers of paint but sometime manufacterers add paint protection film to bring the total up to 4
the moon is 250,000 miles away. How many inches is it from earth?
Answer:
1.584e10 = 15,840,000,000,000
Explanation:
250,000 miles
multiply the length value by 63360
25e4 x 63360
= 1.584e10
Answer: 110000000 inches
Explanation: Since the moon is 1,320,000,000ft away from the earth you divide 1,320,000,000ft with 12 to get your final answer 110000000
Please help me with this thank you
Which of the following is an example of physical property?
A- corrosion
B-malleability
C-tarnish
D-rust
Answer:
B. Malleability
Explanation:hope it help
1. A 4.00 L sample of air at 35 degrees C expands to 5.50 L when heated. What is
the new temperature, in degrees Celsius, of the air
Answer:
150.5 °C
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 4 L
Initial temperature (T₁) = 35 °C
Final volume (V₂) = 5.5 L
Final temperature (T₂) =?
Next, we shall convert 35 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 35 °C
Initial temperature (T₁) = 35 °C + 273
Initial temperature (T₁) = 308 K
Next, we shall determine the final (i.e the new) temperature of air. This can be obtained as follow:
Initial volume (V₁) = 4 L
Initial temperature (T₁) = 308 K
Final volume (V₂) = 5.5 L
Final temperature (T₂) =?
V₁ / T₁ = V₂ / T₂
4 / 308 = 5.5 / T₂
Cross multiply
4 × T₂ = 308 × 5.5
4 × T₂ = 1694
Divide both side by 4
T₂ = 1694 / 4
T₂ = 423.5 K
Finally, we shall convert 423.5 K to celsius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
T₂ = 423.5 K
T₂ = 423.5 – 273
T₂ = 150.5 °C
Thus, the new temperature of the air is 150.5 °C
How many molecules are present in 0.93 grams of Fe2O3?
Answer:
5.8125*10^-3
the moles in Fe2O3 are 0.93/(56*2 + 16*3) = 5.8125*10^-3
Directions Solve the given problem below by showing the following:
I ELECTRONIC CONFIGURATION
2. LED structure
GIVEN: Magnesium (Mg) and Oxygen (180).
Explanation:
(a). Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion, <br> (At No. of Mg=12) ,brgt (b). Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion. <br> (At. No. of S=16).
True or False: Inertia is an object's resistance to change *
Answer:
True? I think.........
how does the air move in a land breeze?
Answer:
The air over the ocean is now warmer than the air over the land. The land loses heat quickly after the sun goes down and the air above it cools too
Explanation:
Bubbles are released when nitric acid is added to a potassium carbonate solution.
What is the net ion
What do tissues working together
form?
Organs
Organ systems
Answer:
tissues working together form organs.
The answer is organs.
Explanation:
cells form tissues, tissues form organs, and organs that fulfill related functions make up the organ system...hope this helps(:
1. What is temperature?
2. How do temperatures change?
3. What affects the temperature of a system?
4. How are temperature and molecular motion related?
5. How is molecular motion related to kinetic energy?
Answer:
1. não entendi
.
3. não entendi
4. não entendi e
5. não entendi
2. não entendi
rysor
Explanation:
Answer:
here...
Explanation:
1 - Temperature is a quantitative measure of how hot or cold something is. Temperature is fundamentally linked to the kinetic energy of atom-scale particles. The Celsius scale is based on the older centigrade scale, adapted slightly to take account of the absolute temperature scale, measured in kelvins, symbol K.
2- Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.
3- When a system absorbs or loses heat, the average kinetic energy of the molecules will change. Thus, heat transfer results in a change in the system's temperature as long as the system is not undergoing a phase change.
4- As the temperature increases, the kinetic energy of the molecules of the liquid increases. The movement of the molecules gradually overcomes forces of attraction between the molecules, with the result that they have greater freedom to move, over greater volumes.
5- The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
What is the correct hybridization for a ion of IF6 that has a charge of (1-)
Answer:
6 F atoms at 6 corners
Explanation:
The shape of IF6 (-1) is trigonally distorted octahedron. The central iodine atom has 7 valence electrons. It gains one electron from negative charge. Out of 8 electrons, 6 are imvolved in formation of 6 I - F bonds and one lone pair of electrons is present. 6F atoms are present at 6corners of distorted octahedron. The lone pair of electrons distorts the octahedral shape due to electron repulsion.
What is the total amount of heat needed to change 2.25 kg of silver at 0.0°C to 200.0°C? The specific heat of silver is 0.129 J/g·°C (2.25 kg = 2250 g)
Answer:
Q = 5805 Joules.
Explanation:
Given the following data;
Mass = 2250g
Specific heat capacity of silver = 0.129 J/g·°C
Initial temperature, T1 = 0.0°C
Final temperature, T2 = 200.0°C
To find the quantity of heat needed;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat. m represents the mass of an object. c represents the specific heat capacity of water. dt represents the change in temperature.dt = T2 - T1
dt = 200 - 0
dt = 200°C
Substituting the values into the equation, we have;
[tex] Q = 225*0.129*200[/tex]
Q = 5805 Joules.
Therefore, the amount of heat needed is 5805 Joules.
Given values:
Mass, [tex]m = 2250 \ g[/tex]Specific heat capacity, [tex]0.129 \ J/g.^{\circ} C[/tex]Initial temperature, [tex]T_1 = 0.0^{\circ} C[/tex]Final temperature, [tex]T_2 = 200.0^{\circ} C[/tex]then,Change in temperature, [tex]dt = T_2-T_1[/tex][tex]= 200-0[/tex]
[tex]= 200^{\circ} C[/tex]
As we know the formula,
→ Heat capacity, [tex]Q = mcdt[/tex]
By substituting the values, we get
[tex]= 225\times 0.129\times 200[/tex]
[tex]= 5805 \ Joule s[/tex]
Thus the above answer is right.
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BRAINLIEST!!
Of the following elements, which one would have the LOWEST
electronegativity? *
Potassium (K, atomic #19)
Hydrogen (H, atomic #1)
Cesium (Cs, atomic #55)
Sodium (Na, atomic #11)
Explain please:))
Answer:
Cesium
Explanation:
cuz i looked at the chart from highest to lowest
What is a controlled variable
Answer:
The part of the experiment that is set to compare data
Explanation:
The controlled variable is what stays constant throughout an experiment. You use the controlled variable to compare the new data to see what happened during whatever reaction you could say.