Answer:
88.20%
Explanation:
% yields =( experimental yield /theoretical yield )x100%
= ( 56.8 ÷ 64.4 ) x100%
= 88.20%
The percent yield for the given reaction where in the product obtained is 56.8 g is 88.19%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .In the given example , percent yield=56.8/64.4×100=88.19%.
Thus, the percent yield of reaction is 88.19 %.
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What do you think the scientific question is for the
boiling water experiment
Answer:
Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.
Identify the number of significant figures in each of these measurements of an object length: a. 76.48 cm b. 76.47 cm c. 76.59 cm
All of the measurements have 4
The number of significant figures in each of these measurements of an object's length: a. 4 b. 4 c. 4.
What are significant figures?The significant figures are the digits or numbers from zero to nine which are used to signify and specify the reporting of the measurement having uncertain digits.
Starting zero is not significant, decimal is not significant, ending zero after the decimal is significant and ending zero before and without decimal is not significant.
Therefore, a. 76.48 cm = 4 b. 76.47 cm c. = 4 76.59 cm = 4 are the number of significant figures in each of these measurements of an object's length.
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Question 7
Which of the following discoveries led to the development of the quantum mechanical model?
A electrons occupied different energy levels around the nucleus
B
atoms of gases combined to form compounds in whole-number ratios
Cmost alpha particles passed through gold foil without hitting matter
D cathode rays could be bent by a magnetic field
13. To refine aluminum from its ore, aluminum oxide is electrolyzed to form aluminum and oxygen. At which electrode does oxygen form?
O A. Both the anode and the cathode
OB. Anode
O C. Cathode
OD. Neither electrode
Answer:
I think B
Explanation:
Answer:
Anode
Explanation:
What is the volume of a liquid with a density of 1.5 g/L and a mass
of 78 grams?
Answer:
d =
m
V
m = d×V
V =
m
d
DENSITY
Density is defined as mass per unit volume.
d =
m
V
Example:
A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?
Step 1: Calculate the volume
V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³
Step 2: Calculate the density
d =
m
V
=
433
g
200
c
m
³
= 2.16 g/cm³
MASS
d =
m
V
We can rearrange this to get the expression for the mass.
m = d×V
Example:
If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?
m = d×V = 500 mL ×
1.11
g
1
m
L
= 555 g
VOLUME
d =
m
V
We can rearrange this to get the expression for the volume.
V =
m
d
Example:
What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.
Step 1: Convert kilograms to grams.
14.83 kg ×
1000
g
1
k
g
= 14 830 g
Step 2: Calculate the volume.
V =
m
d
= 14 830 g ×
1
c
m
³
19.32
g
= 767.6 cm³Explanation:
Example #2: Ajet is traveling at 80 m/s when it starts to approach
a runway. It is able to land and park in 10 s. What is its
acceleration?
Answer:
-8 m/s^2
Explanation:
The formula for acceleration is:
a= v^2 - v^1/t
a= acceleration
v^2- final velocity which in this case would be 0 since the jet comes to a stop.
v^1= original velocity which is 80 m/s.
t=time or 10s
Substitute the letters for the numbers and you get this:
a= 0 - 80/10
0 - 80= -80
-80 divided by 10 is -8.
Hope this helps! :)
Justin B. Believes that the temperature lowering during the fall months is what causes the color of the leaves to change. He set up an experiment wherein he placed some plants in 80 degrees rooms and some in 60 degree rooms. He observed the color of the leaves for a total of 1 month. At the end of the month Justin observed that 3/4 of the plants in the 60 degree temperature had begun to change colors and only 1/4 of the plants in the 80 degree temperature began to change colors.
Answer:
This question is incomplete, the remaining part of the question is:
What is the control group, independent variable and dependent variable?
Control group: Plants placed in 80 degree rooms
Independent variable: Change in temperature
Dependent variable: Change in color of leaves
Explanation:
The independent variable in a scientific experiment is the variable that the experimenter controls or manipulates in order to bring about a change in the dependent variable. In this experiment, the variable manipulated by Justin B is the TEMPERATURE CHANGE.
On the other hand, a variable is said to be dependent if it is the variable that responds to a change made to the independent variable or rather it is the outcome. In this experiment, Justin B is trying to see the outcome on the color change in leaves when exposed to a low temperature, hence, COLOR CHANGE IN LEAVES is the dependent variable.
Control group of an experiment is the group that receives no experimental treatment. It is the group the experimenter considers normal and hence is comparing with his experimental group. In this experiment, Justin B believes the leaves change color in a low temperature, hence, he placed some plants in a lower temperature (60 degree) in order to compare them with when the plants are placed in a higher temperature (80 degree). As far as this experiment is concerned, the plants placed in 80 degrees temperature are believed by Justin B not to undergo color change, hence, they are the CONTROL GROUP while the group he placed in 60 degrees temperature are what he is interested in, making them the EXPERIMENTAL GROUP
Convert 205 L to ul.
Answer: 205000000 microliter
Hope this helps!
Answer:
2.05 x 10⁸ uL
205000000 uL
Explanation:
Step 1: Find the conversion
1 liter (L) = 1 x 10⁶ microliters (uL)
Step 2: Set up dimensional analysis
[tex]205 L(\frac{1(10)^6uL}{1L} )[/tex]
Step 3: Multiply and cancel out units
Liters and Liter cancel out.
We are left with uL
205(1 x 10⁶) = 2.05 x 10⁸ uL or 205000000 uL
Which of the following are pure substances?
table salt, NaCl
water, H20
Oxygen, 02
elements
compounds
all of the above
NaCl, H2O and O2 are all pure substance since it cant be separated.
Built from amino acids
carry out most of the life-sustaining functions of the human body
Answer:
proteins carry out most of the life sustaining functions of the human body
How might you measure the amount of energy in the world's largest rice cake?
Answer:
kindly check the explanation section.
Explanation:
The largest rice cake in the world was discovered in the year 2007 in South Korea with a weight of 8,113 lb. The amount of energy in the World's largest rice cake can be determined by using the formula below:
The energy in kJ =[ mass of water] x [specific heat capacity of water] x [change in temperature].
In order to determine experimentally in the laboratory and make use of the formula above. The first thing[STEP ONE] to do is to measure the mass of the rice cake and record it.
STEP TWO: measure a known amount of water in a boiling tube.
STEP THREE: Heat the rice cake until it catches fire with a Bunsen flame.
STEP FOUR: Use the rice cake that has already caught fire in step three above and use it to heat the water in step two until the fire burns out.
Repeat the process for three to four times and record your observations under the following headings;
[1]. Mass of cake, [2]. Temperature of water before burning, [3]. Temperature of water after burning and Temperature increase per gram of the rice cake.
Explain the brosted lowery Concept of Acid & Bases with the help of example? I will brainlist you for the correct answer.
Answer:
•A Brønsted-Lowry acid is any substance (molecule or ion) that can donate a hydrogen ion ( H+ ).
•A Brønsted-Lowry base is any species that can accept a hydrogen ion ( H+ ).
Explanation:
*example based on the picture*
Take the following reaction for example:
Hydrochloric acid ( HCl ) is the Brønsted-Lowry acid because it donates a hydrogen ion. Ammonia ( NH3 ) is the Brønsted-Lowry base because it accepts the hydrogen ion.
The Brønsted-Lowry theory also introduces the concept of conjugate acid-base pairs. A conjugate acid-base pair are two species that differ by a ( H+ ) ion.
Based on the reaction above, the ammonium ion( NH+4 ) is the conjugate acid of the base ammonia and the chloride ion ( Cl− ) is the conjugate base of hydrochloric acid.
Hope this helps !What is the parent isotope when Cl-33 is formed during a beta decay?
Answer:
33/16 S
Explanation:
In beta decay, the atomic number of the daughter nucleus increases by one unit while the mass of the daughter nucleus remains the same as that of the parent nucleus.
Hence, if we know that a beta decay has occurred, then the parent nucleus must have the same mass as its daughter nucleus but have an atomic number that is less than that of the daughter nucleus by only one unit, hence the answer above.
Which statement best explains why the overall charge on an atom is zero? The positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud. The positive charge of the protons in the nucleus equals the negative charge in the electron cloud. The negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud. The negative charge of the protons in the nucleus equals the positive charge in the electron cloud.
the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud
Answer:
B on egde
Explanation:
Help on this question.
Density= mass/volume
D=25/25
D= 1 g/cm^3
What is 0.00034 in exponential form
Answer:
3.4 × 10 ^− 4
Explanation:
Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the
10 . If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.
3. Dorji was provided with four colourless solutions. He was asked to
identify the type of solution using universal indicator. Dorji's finding is
recorded in Table 8.5. Use the information from Table 8.5 to answer the
questions that follow.
Table 8.5.
Solution
COA
Colour change of universal indicator
Red
Blue
Purple
Yellow
en
i. What type of solutions are solution A and solution C?
ii. Which solutions do you think are:
a. acidic in nature?
b. basic in nature?
iii. What will happen if equal volume of solution B and solution D are
mixed?
Answer:
First, we can test Solution 1. We know that Sodium Hydroxide is a strong base. If we test acids on blue litmus paper, they will turn red. If we test bases on red litmus paper, they will turn blue. So, you can test all the of the solutions- water, sodium hydroxide and hydrochloric acid with blue and red litmus paper. HCl, Hydrochloric acid is an acid, so it will turn blue litmus paper red. It will not turn red litmus blue. The acids will turn blue litmus paper red. The bases will turn red litmus paper blue. Only water is a neutral liquid, which will not turn blue litmus paper red or red litmus paper blue. It will not change the colour of it. Thus, if you test all the solutions with blue and red litmus paper, you will know which solution is water. Water is the only one which is neutral. It is the only solution which cannot change the colour of any litmus paper. Thus, you can identify it very easily.
Explain the need of the term avarage atomic mass
Answer:
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.
Hope this helps :)
When a high mass main sequence star runs out of both hydrogen and helium in its core, the core begins to fuse
Answer:
i guess it explodes
Explanation:
Answer:
carbon
Explanation:
Which of the following questions cannot be answered by science? How does color of light affect the mating behaviors of bees? How does soil pH affect the productivity of fruit trees? How does temperature affect the amount of oxygen able to dissolve in water? How do contrasting colors affect the quality of a painting?
Answer: How do contrasting colors affect the quality of a painting
Answer:
The answer is D.
Explanation:
I just took the test. :)
Which has a larger density a large brick or a small brick? why?
Answer:
15.2
Explanation:
the chemical reaction in chemistry libretto texts.
Answer:
Neither
Explanation:
Density is independent of size. Basically, the density of an object isn't determined by it's size.
If two objects are made of the same exact material, they will have the same exact density, regardless of the size.
So, the large brick and the small brick will have the same density, as long as they are made from the same type of brick material.
Obtain the valence shell configuration of Al and S from their positions in the periodic table.
Answer:
Al: 3
S: 6
Explanation:
Al is in Group III. This means that it has 3 valence electrons.
S is in Group VI. This means that it has 6 valence electrons.
I hope this helps :)
what is the difference between deep water and shallow water waves???
Answer:
The change from deep to shallow water waves occurs when the depth of the water , d , becomes less than one half of the wavelength of the wave, λ....A wave with a longer wavelength travels at higher speed . In contrast , shallow - water waves show no dispersion . Their speed is independent of their wavelength .
Hope this helps :)
In an ocean ecosystem,the difference between deep water and shallow water waves is that waves in water deep enough so that the bottom has no effect on them are termed deep-water waves, whereas waves most affected by the bottom are called shallow-water waves.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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In hot sunlight, dry sand heats up more than ocean water. What principles of heat and thermal energy does this difference demonstrate?
Answer:
1) Heat capacity
2) Thermal Conductivity
3) Heat reflection
Explanation:
The heat capacity of a body is the heat required to raise the temperature of the given mass of the body by 1° C.
The heat capacity = Mass × Specific heat capacity
Given that the mass of the ocean, which covers 70% of the Earth's surface has a much larger mass than a given unit of sand and that the specific heat capacity for the water (4,200 J/(kg·°C)) is much more than that of the sand (800 J/(kg·°C)), the heat required to raise the temperature of the mass of sand by 1°C is much less than the heat required to raise the temperature of the temperature of the ocean by 1°C
Therefore, the sand will have a higher temperature than the ocean when exposed to the same Sunlight
2) The ocean has a thermal conductivity of 0.5 W/(m·°C) the thermal conductivity of sand is 2.05 W/(m·°C), therefore, sand takes heat from the Sun faster than the ocean which also increases its temperature
3) The albedo, of the ocean is more than that of the sand so the ocean absorbs more of the Sun's heat than the sand but very little of the heat is conducted.
what are the fundamental particles of an atom
Protons, neutrons, and electrons are the fundamental subatomic particles.
Which term represents the movement of molecules from an area of lower concentration to one of higher concentration with carrier molecules, using energy?
Answer:
Active transport
Explanation:
Active transport is defined as the movement of ions or molecules from a region of lower concentration into a region of higher concentration by the use of energy. Two examples of active transport include the uptake of glucose in human intestine and the absorption of mineral ions into plant roots.
Active transport requires energy because it involves the movement of molecules against an existing concentration gradient.
WHAT IS THE CHEMICAL FORMULA FOR WATER
Answer:
are you a kid bruh xd
Explanation:
H2O
Answer:
[tex]\huge\boxed{H_{2}O}[/tex]
Explanation:
Water is made up of two elements => Hydrogen and Oxygen
There are two hydrogen and one oxygen
So,
The chemical formula for water is:
=> H₂O
An airplane travels 2100 km at 1000km/hE. It encounters a wind and slows to 800 km/h E for the next 1300 km. What is the average velocity of the airplane for this trip?
Answer:
The average velocity of the airplane for this trip is 1684.21 km/h
Explanation:
Average velocity is the rate of change of displacement with time. That is,
Average velocity = [tex]\frac{Displacement }{Change in time}[/tex] = Δx / Δt = [tex]\frac{x2 - x1}{t2 - t1}[/tex]
Now we will calculate the time taken by the airplane for the first motion before it encounters a wind.
From,
Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]
Time = [tex]\frac{Distance traveled}{Velocity}[/tex]
Therefore, Time = [tex]\frac{2100km }{1000km/h}[/tex]
Time = 2.1h
This is the time taken before the airplane encounters a wind.
Hence, t1 = 2.1h
Now, For the time taken by the airplane when it encounters a wind
Also from,
Velocity = [tex]\frac{Distance traveled}{Time taken}[/tex]
Time = [tex]\frac{Distance traveled}{Velocity}[/tex]
Therefore, Time = [tex]\frac{1300km }{800km/h}[/tex]
Time = 1.625h
Hence, t2 = 1.625h
Now, to calculate the average velocity
Average velocity = [tex]\frac{x2 - x1}{t2 - t1}[/tex]
x1= 2100, x2= 1300, t1= 2.1h and t2= 1.625h
Hence, Average velocity = [tex]\frac{1300 - 2100}{1.625 - 2.1}[/tex]
Average velocity = 1684.21 km/h
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the gravitational potential energy of falling water per second = mass (kg) × height (m) × gravity (9.8 m/s2), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?
Answer:
The power of Niagara falls is 1,176 Mega Watts
The number of 15 Watt bulbs it can power is 8,400,000 bulbs
Explanation:
The rate at which the water falls given as the mass flow rate = 2,400,000 kg/s
The height from which the water falls = 50 m
The gravitational potential energy (potential energy PE.) of falling water = Mass (kg) × height (m) × gravity (9.8 m/s²)
The mass of water that falls per second = 2,400,000 kg
PE. = 2,400,000 kg × 50 m × 9.8 m/s² = 1,176,000,000 Joules
The power = The rate at which the energy is generated = The amount in kg of water that fall from the height per second × The height × Acceleration due to gravity
The power = 2,400,000 kg/s × 50 m × 9.8 m/s² = 1,176,000,000 Watts
The power of Niagara falls = 1,176,000,000 Watts = 1,176 Mega Watts
The number of 15 Watt bulbs it can power = 1,176,000,000/15 = 78,400,000 bulbs
The number of 15 Watt bulbs it can power = 8,400,000 bulbs.
Three models of atomic theory are illustrated in the image. Place them in chronological order.
A)
A, B, C
B)
BAC
CAB
D)
CBA