Answer:
The percent error is 0.023%.
Explanation:
Pre-weighed of a quarter is 5.6026 g.
The weight that the student obtains for the same quarter is 5.6013 g.
We need to find the percent error in the students reading. It is given by the formula as follows :
[tex]\%=\dfrac{|\text{original value-calculated value}|}{\text{original value}}\times 100[/tex]
Putting all the values, we get :
[tex]\%=\dfrac{5.6026 -5.6013 }{5.6026 }\times 100\\\\\%=0.023\%[/tex]
So, the percent error is 0.023%.
The MSDS for chloroform indicates that it is a clear liquid that has a pleasant smell and substantial vapor pressure. People should avoid inhaling its vapors, and it is sensitive to light. Malik needs 10 mls of chloroform for an experiment. According to this information, how should he safely pour the chloroform?
A.He should locate the chloroform stored in a transparent container in chemical storage and pour directly into his beaker from that location.
B.He should locate the chloroform stored in a transparent container in chemical storage and should take it to the fume hood to pour.
C.He should locate the chloroform stored in a dark container in chemical storage and should take it to the fume hood to pour.
D.He should locate the chloroform stored in a dark container in chemical storage and pour directly into his beaker from that location.
Answer:C.He should locate the chloroform stored in a dark container in chemical storage and should take it to the fume hood to pour.
Explanation:
The statement of the question clearly states that chloroform is sensitive to light and it's vapour is toxic.
If a substance is sensitive to light, then it must be stored in a dark bottle. This is because. If a substance that is sensitive to light is stored in a transparent container, it may be decomposed by light.
Being a substance whose fumes are toxic, Malik should pour the liquid in a fumes hood so that he does not inhale the fumes.
These models show the electron structures of two different nonmetal elements. Element 1 at left has a purple circle at center with 2 concentric black lines around it. The first line has 2 small green balls on it. The second line has 8 small green balls on it. Element 2 at right has a purple center with 5 concentric circles around it, with the first circle innermost. The first circle has 2 small green balls on it, and the second circle has 8 small green balls on it. The third circle has 18 small green balls on it, and the fourth circle has 18 small green balls on it. The fifth circle has 6 small green balls on it. Which element is likely more reactive, and why?
Answer:
Element 2
Explanation:
If we look at the model stated for element 1, it is clear that element 1 must be a noble gas. It has eight electrons in its outermost shell this implies that it has already attained a complete octet of electrons and is reluctant towards chemical reaction.
The second element belongs to group 16 since it has six electrons on its outermost shell. It is certainly more reactive than element 1 which is a noble gas.
Answer: D
Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.
Explanation: Answer on Edgenuity
ANSWER FAST PLEASE!!
Ali rolled a ball down a hill. This graph shows the kinetic and potential energy of the moving ball.
A line graph The graph is titled Mechanical Energy and shows an inverse relationship between Potential energy and Kinetic Energy. The Y axis is Potential energy (J). The X axis is Kinetic energy (J). The point of the graph are as such: (0, 5); (1, 4); (2, 3); (3, 2); (4, 1); (5, 0)
According to the graph, what is the mechanical energy of the ball?
A. 0 J
B. 5 J
C. 20 J to 25 J
D. 0 J to 4 J
Answer:D
Explanation:
Hope I helped
When we plot the relation between kinetic energy and potential energy, we get an inverse line. The mechanical energy of an object is the sum of kinetic energy and potential energy. . The mechanical energy here is 5 J.
What is mechanical energy?Mechanical energy of an objects is the sum of it energy of motion and the stored energy of position, that is the sum of kinetic energy and potential energy.
Kinetic energy of an object result from its motion whereas potential energy results from the position of the object. Both kind of energy depends on the mass of the object.
Kinetic energy also depends on the velocity of the object and potential energy depends on the height and gravity experienced by it. Both are thus directly proportional to the mass of the object.
Here, all the points in the graph have a total energy of 5 J . for example for the first point the sum is 0 +5= 5J. Similarly, all the points have a total of 5 J.
Therefore, the mechanical energy of the system is 5J and the option B is correct.
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After lab, all of Darrel's friends looked at his data and laughed and laughed. They told him that he was 30.8% too low in the boiling point he had just recorded. He had recorded a boiling point of 50o C on his data sheet. What is the correct boiling point of the liquid he was working with in lab?
Answer:
100°
Explanation:
For a boiling point is it always 100°
What is Aerosol,sol and gel
how does litmus indicator work
What is the formula for an alkene containing six carbon atoms?
A. C6H10
B. C2H6
C. C6H12
D. C5H12
Answer:
C. C₆H₁₂
Explanation:
Alkenes are the unsaturated hydrocarbons which form a homologous series with a general formula;
Cₙ H₂ₙ
n in this problem is 6
2n = 2 x 6 = 12
The formula of the compound will be C₆H₁₂
Pollinators, like bees, have a mutualistic relationship with plants. The pollinators carry pollen from plant to plant. What statement provides support for this as a mutualistic relationship?
A)The bees receive no benefit but are also not harmed. Only the plant receives benefits.
B)The bees provide protection for the flowers and the flowers protect the bees.
C)The bees deprive the flowers of valuable resources while pollinating the flowers.
D)The bees receive food from the nectar while the plants are pollinated.
Answer:
D)The bees receive food from the nectar while the plants are pollinated.
Explanation:
Bees and flowering plants have a mutualistic relationship where both species benefit. Flowers provide bees with nectar and pollen, which worker bees collect to feed their entire colonies. Bees provide flowers with the means to reproduce, by spreading pollen from flower to flower in a process called pollination.
Answer:
The bees receive food from the nectar while the plants are pollinated.
Explanation:
This is correct, but make sure it's for your answer choice, mine was A, but they switch them around.
You are about to take a short trip. However, you will not be traveling by car or bus; instead you will be traveling up in a hot air balloon. You know that hot air balloons, like the ones pictured, are able to rise when the air contained in them is heated. Why does the balloon rise? What is happening at the molecular level to make the balloon rise?
Answer:
Hot air rises. Heated air molecules “spread out” or expand and bounce around, and the space becomes less dense than the surrounding space. Increasing the air temperature inside the balloon envelope makes it less dense than the air, thus making it “lighter than air”.
Explanation:
I'm new to brainly but I hope this helped!
Balloon rise because Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.
What are molecules ?
A molecule is the smallest unit of a substance that keeps its content and properties. It is made up of two or more atoms that are joined together by chemical bonds.
Chemistry is built on molecules. The element symbol and a subscript indicating the number of atoms are used to identify molecules.
When Balloon rise because Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.
The air inside the balloon's envelope becomes less dense as the temperature rises, making it "lighter than air."
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Which of the following sets of data could match the unknown element?
Answer:
✔️Metalliod, Mass: 73
Explanation:
The unknown element that is represented in the Periodic table is Germanium (Ge). It is in Group 14(IVA) and Period 4 of the periodic table. It is a metalloid and a silvery-gray substance. It's properties are intermediate between metals and nonmetals. It has a mass of 73 and an atomic number of 32.
Please help me
Identify each thermal energy scourge as Conduction (A) Convection (B) Radiation (c)
Answer:
I think it is...
1) A
2) C
3) A
4) B
5) A
6) C
Explanation:
I'm so sorry that I'm so late, I just wanted to answer it to help you. I don't know if you got graded on it already, but hey, I tried :)!
Explain three ways the periodic table is organized. Include in your essay the
definition of two listed trends and the patterns observed for each of your selected
trends on the periodic table
Answer:
The periodic table is organized in non-metals metals and metalloids, in in terms of trends and patterns you may want to talk about the the density of the elements or the mass of per unit of measurement of whatever you're going to use sorry that could be much help but I hope it helps.
Which takes longer to bake, chocolate chip cookies or oatmeal cookies? What
are the independent variables? *
Explanation: oatmeal cookies, and the independednt variable is the kind of cookie
name two diffirent kinds of animals and identify at least one characteristic that makes them diffirent from each other
Answer:
Bears and Whales
Explanation:
Bears keep themselves warm via a thick fur coat
Whales keep themselves warm with a thick layer of blubber
What happens if you mix lithium and aluminum together?
Answer:
hello
Explanation:
do you meant something like that
What would happen if there were 3 protons and 0 neutrons in the nucleus of an atom?
Answer:
the atom will be positife atom
Please help ASAP 100 points points help I will mark you as brainlister
this is lithium ion with a +1 charge
please help.
In 1976, an airplane was flown at a speed of 2193 miles per hour. How many kilometers could the plane fly in 4.3 hours? Use D.A. with these conversion factors: 1mile = 5280ft 1ft =12 inches 1 inch = 2.54cm
Answer:
9429.9
Explanation:
periodt
Which of the following is false regarding supersonic speed?
Question 10 options:
When an object reaches supersonic speed a sonic boom will occur.
When an object reaches supersonic speed it is moving faster than the speed of light.
When an object has reaches supersonic speed it breaks the sound barrier.
When an object supersonic speed it is moving faster than 343 meters/second.
Answer:
the answer is C
Explanation:
i know this one, and may YOU PLEASE MARK BRAINLIEST I ONLY NEED ONE MORE CROWN TO MOVE TO THE NEXT RANK
How would the particles of a solid, liquid, and gas ALL at room temperature compare? *
A.solid particles have lower average kinetic energy
B.the gas particles are larger than both solid and liquid
C.the pas particles are moving the slowest
D.the spacing of the particles is different, but all have the same average kinetic energy
Plz help
Answer:
A
Explanation:
Solid particles only vibrate, so they have very little kinetic energy.
For B, the size of the particles stay the same, just phase/state changes, so not B.
For C, gas particles move the fastest compared to liquid and solid given the same environment.
For D, they don't have the same kinetic energy because solid particles barely move while gas particles keep moving.
What are the benefits and dangers of the Iron element in our daily life?
what part of the scientific method involves drawing inferences about experimental results and determining if the collected data support the original hypothesis?
Answer:
Drawing Conclusions
Explanation:
You put together your observations and can finally decide if your hypothesis was right or not.
What is the mass of an object with a density of 5.7 g/cm^3 and a volume of 48
cm^3? *
Answer:
273.6 g
Explanation:
mass =(density)(volume)
mass=(5.7g/cm^3 )(48 cm^3)
cancel out your cm^3 and your are left with grams
multiply (5.7g)(48)=273.6 g
The mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.
What is density?Density is defined as the degree to which a material is packed together.
It is also defined as a mass per unit volume of the substance.
Its SI unit is kilogram per cubic meter or gram per meter.
Density can be expressed as
Density = mass / volume
Mass = density x volume
As given, Density = 5.7 g/cm³
Volume = 48 cm³
So, Mass = 5.7 g/cm³ x 48 cm³
= 273.6 grams
Thus, the mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.
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Which is the IUPAC name for NO?
nitric oxide
binitrogen oxide
dinitrogen dioxide
nitrogen monoxide
The IUPAC name for NO is nitric oxide. The correct option is A.
What is IUPAC naming?The International Union of Pure and Applied Chemistry (IUPAC) is a global organization that represents chemistry as well as related sciences and technologies.
The chemical compound's identity is represented by its common and IUPAC names, which differ from one another. Every chemical compound has multiple names.
Complete the following step-by-step response: The IUPAC nomenclature is a standardized name given to organic compounds in accordance with official naming rules.
Nitric oxide, also known as NO, is a colorless gas. It is one of the most important nitrogen oxides.
Nitric oxide is a free radical, which means it has an unpaired electron, which is sometimes represented in its chemical formula by a dot.
Thus, the correct option is A.
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Answer:
D: Nitrogen Monoxide
Explanation:
There's one Nitrogen atom and one Oxygen atom
The first energy level which has f orbitals to fill is
A. 3
B.4
C.5
D.2
Answer:
the answer is 4 because 3 just have d orbitals
what do you mean by international understanding peace
and cooperation
Answer:
International understanding or internationalism is a feeling that the individual is a not only a member of his country, but a member of the world as well. To ensure world peace. To prevent world wars. To promote human welfare. To promote mutual understanding and interdependence.
Which properties change the composition of a substance?
A chemical properties
B physical properties
C neither chemical nor physical properties
D chemical and physical properties
Answer:
D. Chemical and physical properties
Suppose you wanted to determine the probability of a student being found at
various locations in your school building at 10am . How might you investigate this
problem based on probability?
Answer:
[tex]the \: proberbility \: will \: be : \\ \frac{number \: of \: class \: rooms \: with \: her \: friends}{total \: number \: of \: class \: rooms \: in \: the \: building} [/tex]
Explanation:
[tex]♨Rage♨[/tex]
Which statement about aldehydes and ketones is correct?
A) In aldehydes, the carbon is always joined to at least one hydrogen atom.
B)Every ketone molecular formula is unique.
C) Aldehydes are similar to ketones, but their carbonyl group is located in the middle of the carbon chain.
D) In ketones, the carbon of their carbonyl group is bonded with one other carbon.
Answer:
A) In aldehydes, the carbon is always joined to at least one hydrogen atom.
Explanation:
Aldehydes and Ketones are organic compounds.
The main difference between them is that aldehydes have the carbon atom attached to at least one hydrogen atom.
In ketones, the carbon is attached to another carbon.
The IUPAC names of alkanals usually end with -eFor alkanones usually end with -oneTo reiterate, the striking difference between the two families is that in alkanals, a hydrogen atom is directly attached to the carbonyl group while in alkanones, no hydrogen atoms is attached to the carbonyl group but two bulky alkyl groups.
How will you increase the solubility of a gases in a liquid solvent?
A. Decrease the Temperature
B. Decrease the Pressure
C. Increase the Temperature
D. Increase the Pressure
Answer:
increase the temperature
Explanation:
The solubility of a gas in a liquid will increase if: Lower the temperature of the solution , and therefore, lower the kinetic energy of the gaseous particles so they can escape the liquid phase less often.