Answer:
See explanation
Explanation:
A pure sample is known to give one spot on a chromatogram. This is the first indication that the substance is a pure substance. Since the student saw a single spot, the unknown substance is pure.
Subsequently, the substance can be boiled since it is a liquid. Impure substances boil over a range of temperatures. If the substance is pure, it will have a sharp boiling point which can be compared with boiling points of known substances recorded in literature hence the substance can be correctly identified.
The given unknown material or compound is a pure compound - yes, it has only one spot.
In the given TLC plate there is only one single spot found thus we can say it is the pure compound as If an impurity is present along with the major compound then there we could observe more spots other than the major compound.
The verification of the purity of the sample can be tested by a general procedure
conduct the TLC of the given compound and a separate TLC consisting of the pure compoundcompare the Rf values of both platesif it matches with the Rf value of the pure compound then the given compound is confirmed. the TLC plate has no spots other than the main compound therefore, it is a pure one.Thus, The given unknown material or compound is a pure compound - yes, it has only one spot.
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A 10 kg box is 1.3 m above the ground. How much potential energy does it have? (g on Earth of 9.8 m/s?
answer =
GPE = mgh
KE = .5mv2
I really need help
Compare the speeds of particles in the ice water and air
Answer:
In air the particles are much faster than in the ice water
Explanation:
In ice water it's logically much colder, aso ice is solid, which means the particles can't move freely, otherwise it wouldn't be solid. In the air they can move around freely, because air isn't solid, it's gaseous.
Which skill is least useful on defense in basketball?
A.Jumping ability
B.Speed
C.Strength
D.Passing ability
what is the reason for the apparent motions of the sun and other stars across the night sky?
Answer:
Answer is A
Explanation:
GOT IT RIGHT ON A P E X :)
The reason for the apparent motions of the sun and other stars across the night sky is the rotation of earth. Hence, option (A) is correct.
What is rotation of earth?The rotation of the planet Earth around its own axis and variations in the orientation of the rotation axis in space are referred to as Earth's rotation or Earth's spin. Earth rotates prograde in an easterly direction. Earth rotates against the direction of the northern polar star Polaris.
The Northern Hemisphere's North Pole, sometimes referred to as the Geographic North Pole or Terrestrial North Pole, is where the Earth's axis of rotation and surface meet. The North Magnetic Pole of the Earth is distinct from this place. The other location where the axis of rotation of Earth crosses the surface is the South Pole, which is located in Antarctica.
The reason for the apparent motions of the sun and other stars across the night sky is the rotation of earth. Hence, option (A) is correct.
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How could you increase the gravitational potential energy of an object without changing its mass and gravity?
A. Make the object larger
B. Raise the object farther off the ground
C. Lower the object towards the ground
D. Allow the object to roll on the ground
Answer:
B Raise the object farther off the ground
jupiter has a mass of 1,898,000,000,000,000,000,000,000,000 kg. How would this number be expressed in scientific notation?
Answer:
Explanation:
How would this number be expressed in scientific notation? 1.898^27 kg. ...
How many moles of Mg would you need to react with 2.5 moles of O2?
Answer:
2mg+o2--->2mgo
2moles of mg react with one mole of o2 to form 2 moles of mgo
given 2.5moles of o2 hence 5moles of mg will react
3) A 15.0kg cannonball is ascending after being launched. Neglect drag.
a)How many forces are acting on the cannonball?
b)What is the magnitude of the net force on the cannonball?
c)What is the magnitude of the cannonball's acceleration
dDescribe the cannonball's speed at this time:
Answer:
c
Explanation:
If the air has a thermal energy of 4.5 x 10 J , what is the air temperature ?
Answer:
This is easy. You subtract the final temperature from the starting temperature to find the difference. So if something starts at 50 degrees Celsius and finishes at 75 degrees C, then the change in temperature is 75 degrees C – 50 degrees C = 25 degrees C. For decreases in temperature, the result is negative.
help with this please idk it
Answer:
Explanation:
I think its
c.d and a.a
im so sorry if i get it wrong
One possible unit of speed is
Answer:
m per second is the answaegnzxn
Water is used for all of the following in an organism except what?
transporting materials, carrying nutrients to and within cells, carrying waste away from cells, or building bone mass?
Hello there,
Answer: The answer to you're question is B.) carrying nutrients to and within cells.
Explanation: Water's extensive capability to dissolve a variety of molecules has earned it the designation of “universal solvent,” and it is this ability that makes water such an invaluable of life sustaining force. On a biological level, water's role as a solvent helps cells transport and use substances like oxygen or nutrients. Catch this, water helps take the toxins out of your body. Water also helps you from getting sick. Plus, the brain is 90% water. So, drink that water..... :3
Compounds are made of more than one type of element bound together in fixed ratios.
True or false?
Answer:
True
Explanation:
There are two major pure substances in Chemistry namely: elements and compounds. Elements are substances made up of only one type of atom which cannot be broken down. For example, H2 symbolizing hydrogen gas is an element.
On the other hand, atoms of different elements can combine together and be held by chemical bonds to form substances called COMPOUNDS. Hence, a compound is pure substance made of more than one type of element bound together in fixed ratios. For example, Al2O3 is a compound comprising of elements Al (aluminum) and O (oxygen) in a fixed ratio of 2:3.
hey someone give me the answers pls
Answer:
B1 and A2
Explanation:
the first one would be B because put 4 into mass times it by the velocity divide it by half because of the radius so the ending result would be 4
number 2 would be A because just input the numbers by the mass, velocity etc.) then any number that needs to be divided for an example radius would have to divide so you divide to get the answer.
Which is occurring when work is being done?
Answer:
When work is being done, the practie of labor is being performed. When work isn't being completed, this is a sign of procrastination.
Explanation:
In the answer.
Answer:
D- energy is being transferred
Explanation:
A motivated three legged goat accelerates at a rate of -2.67 m/s2 from a velocity of 10.8 m/s to a velocity of 3.7 m/s. How long did it take him?
Initial velocity (u) = 10.8 m/s
Final velocity (v) = 3.7 m/s
Acceleration (a) = -2.67 m/s²
By using equation of motion, we get:
[tex] \bf \longrightarrow v = u + at \\ \\ \rm \longrightarrow 3.7 = 10.8 + ( - 2.67)t \\ \\ \rm \longrightarrow 10.8 - 2.67t = 3.7 \\ \\ \rm \longrightarrow (10.8 - 10.8) - 2.67t = 3.7 - 10.8 \\ \\ \rm \longrightarrow - 2.67t = - 7.1 \\ \\ \rm \longrightarrow \dfrac{ - 2.67}{ - 2.67} t = \dfrac{ - 7.1}{ - 2.67} \\ \\ \rm \longrightarrow t = 2.6 \: s[/tex]
[tex] \therefore [/tex] Time taken (t) = 2.6 s
need help asap; put you as brainliest
Answer:
unmmmmmmmm I think the answerA
When propoane (C3H8) undergoes combustion, what are the products formed?
Answer:
fire
Explanation:
The combustion of propane (C3H8) formed the products of carbon dioxide and water.
Alkanes are known as saturated straight-chain aliphatic hydrocarbons. They undergo combustion reactions with oxygen. Like other alkanes, Propane exhibits combustion reaction in the same way as other alkanes do.
During combustion reaction, Propane burns in the presence of abundant oxygen to produce water and carbon dioxide. This combustion reaction librates a heat of about 50 MJ/kg.
The equation of the reaction can be shown as:
[tex]\mathbf{C_3H_8 + 5O_2 \to 3CO_2 + 4H_2O}[/tex]
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can anyone plz give me a right answer now?
Answer:
Dy = - 0.0789 [m]
Explanation:
The vertical component of the vector can be determined with the sine of the angle.
Dy = 0.250*sin(18.4)
Dy = 0.0789 [m]
As the y-component is pointing downwards the component is negative.
Dy = - 0.0789 [m]
Which statement best defines Mechanical Energy?
1.Energy that is produced by an electrical current in a circuit.
2.Energy from the sun
3.The sum of an objects kinetic and potential energy
4.Energy that travels in waves due to vibrations.
Answer:
the sum of an object kinetic and potential energy
You lift a 2.0 kg book from a shelf that is 1 m from the floor. What is the potential energy with respect to floor?
Why does a heat pump need an external source
of energy (such as electrical energy) ?
Answer:
The reason is because a heat pump uses external power to accomplish the work of transferring energy from the heat source to the heat sink. Heat pumps are significantly more energy efficient than simple electrical resistance heaters. The efficiency begins to decrease as the temperature difference between the heat source and sink increases.
Which of the following is the first step in the technological design process?
HELP ASAP PLEASE!! due: 11/20/20
A. construct a prototype
B. evaluate the design
C. define a need or problem
D. research existing solutions
Answer:
C
Explanation:
you cannot any other thing if you don't even know what you are designing.
The first step in the technological design process is to define a need or problem, therefore the correct answer is option C.
What are the stages of technological design?There are mainly five stages of technological design,
Identifying the issue that needs to be solved is the first step in every problem-solving process.
The second stage is to imagine; during this phase,
The chosen product from the imaging stage is planned in the third stage.
Testing, evaluating, and modifying the product are the fourth stage.
The sharing of your solution is the fifth step. To gather comments, discuss your ideas with others, and enhance your product,
Technological designing is a lengthy process that involves a number of steps but identifying the problem we are going to is the most important step among all of the steps because a wrong approach to the problem would lead to faulty design in the later stages.
Thus, the first step in the technological design process is to define a need or problem, therefore the correct answer is option C.
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Mary Jo went on riding her horse through the trails. Her pace was 8 km/hr. She left at 8:30 am and got back to the barn at 9:00 am. How far did she go?
Question 4 options:
16 m/s
4 m/s
4 km
16 km
Answer:
4km
Explanation:
Distance=speed x time
Knowing this we know the time and speed
so it is 8 x .5= D
And 8 x .5 =4
If you have any questions let me know
A soccer ball is rolling across a soccer field. The system consists of the
ball. The force of gravity pulls down on the ball as it rolls. Is the work positive or negative?
Answer:
NEGATIVE
Explanation:
Potential and Kinetic Energy
Pre-Test
Active
1
3
4
TIME REMAINING
58:05
Which statement best compares potential and kinetic energy?
O Objects always have more potential energy than kinetic energy.
Kinetic energy increases and potential energy decreases when the velocity of an object increases.
O Only potential energy decreases when an object's height increases.
O Objects always have more kinetic energy than potential energy.
Answer:
Kinetic energy increases and potential energy decreases when the velocity of an object increases
A man drives his car 5 km east of his starting point then he travels 10 km south and reaches a point. From here he travels 15 km towards west and reaches another point .Finally he travels 20 km towards north. Find the net displacement of the man from where he started
Answer:
hjkjjjrjebdbnnd heudhdb
GIVING BRAINLY, FOLLOW, STARS AND POINTS
Which of the following descriptions of these structures is accurate?
a. they are manufactured shell structures
b. they are manufactured mass structures
C. it's a manufactured shell structure
Answer:
Wheres. The. Pics. Of. The. Structures
Explanation:
*
Which of these answers does not reflect a benefit of being hydrated?
Sleepy
Lubricate Joints
Regulate temperature
Nourish the brain and spinal cord
A 6.2 kg bowling ball that weighs 60.76 N is accelerating at 1.8 m/s2. After 2
seconds, it reaches a speed of 3.6 m/s. What is its momentum at this point?
A. 11.2 kg-m/s
B. 1.7 kg.m/s
C. 22.3 kg-m/s
D. 16.9 kg.m/s
The momentum of the bowling ball at the point where it reaches a speed of 3.6 m/s is 22.3 Kg.m/s (Option C)
How do i determine the momentum?Momentum is defined as the product of mass and velocity. It is represented mathematically as:
Momentum = mass × velocity
Now, we can obtain the momentum of the bowling ball at the point where it reaches a speed of 3.6 m/s. Details below:
Mass of bowling ball = 6.2 KgVelocity of bowling ball = 3.6 m/sMomentum =?Momentum = mass × velocity
Momentum = 6.2 × 3.6
Momentum = 22.3 Kg.m/s
Thus, the momentum at the point is 22.3 Kg.m/s (Option C)
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