Answer:
Distance = 1500miles
time taken = 3 hours
speed of plane = distance/time taken = 1500/3= 500milesperhour
Explanation:
According to the distance formula , the speed of the plane is 500 miles per hour.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit interval of time indicating that it is thus a scalar quantity.The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or in the US and the UK, miles per hour (mph).
Here, speed is calculated as distance /time= 1500/3= 500 miles per hour.
Thus, the speed of plane is 500 miles per hour.
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What is the freezing point of an aqueous 1.00 m NaCl solution? (Kf = 1.86 *C/m) (Assume complete dissociation of the salt.)
Answer:
The freezing point is -3.72 degrees Celsius
Explanation:
In this question, by assuming the complete dissociation of the salt, we want to calculate the freezing point of an aqueous 1 M NaCl solution .
We proceed as follows;
Firstly, we write the dissociation equation;
NaCl ——> Na+ + Cl-
So the number of ions present in the dissociation is 2. This means that the Vant Hogg factor also called I = 2
Mathematically;
ΔTf = Kf*m*i
m represents the molality which is given as 1
So by substituting the values, we have;
ΔTf = 1.86 * 1 * 2 = 3.72 degrees Celcius
The freezing point however is 0 - ΔTf = 0 - 3.72 = -3.72 degrees Celcius
is there any compound like O2C NO2
Answer:
Aye Wassup? Adam Here :D
Explanation:
Nitrogen dioxide is a chemical compound with the formula NO 2.It is one of several nitrogen oxides. NO 2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year for use primarily in the production of fertilizers.At higher temperatures it is a reddish-brown gas.
Hope This Helped Bro: "AdamDaAssasin"
BRAINLIEST PLEASE HELP WITH THIS CHEMISTRY QUESTION!!
Which of the following describes how further studies supported the work done by Ernest Rutherford?
Answer: James Chadwick discovered neutral particles in the nucleus. So your answer is C
Explanation:
I just took a pretest and I had this same question and I got it right
Answer:
James Chadwick discovered neutral particles in the nucleus.
A change in the number of neutrons in an atom will change an isotope. What will happen when the number of protons changes in an atom?
What will be the cost of gasoline for a 4,700-mile automobile trip if the car gets 41 miles per gallon, and the average price of gas is $3.79 per gallon?
Answer:
Idk
Explanation:
Find the gallons needed by dividing total miles by miles per gallon:
4700/41 = 114.634 gallons
Multiply the gallons needed by price per gallon:
114.634 x 2.79 = $319.83 Total
Round the answer as needed.
If gallons were rounded to 115 gallons total cost would be $320.85
$ 434.40
Explanation:41 miles ............ 1 gallon
4700 miles .......x gallon
x = 4700×1/41 = 114.63 gallons
114.63 gallons×$3.79 ≈ $ 434.40
How many cm are in 29.7km?
Answer:
there are 2970000cm in 29.7km
Explanation:
which argument best explains the charge of an atomic nucleus
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation:
hope this helps you:)
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation: Just took test on edgenuity
Which option gives an object's volume in SF units?
O
A. 4.3 kg
B. 2.6 m3
C. 5.5 K
D, 3.4L
SUBMIT
Answer:
The correct answer is:
2.6 m3 (B)
Explanation:
SF unit stands for Stowage factor unit. Stowage factor is the volume occupied by one unit of mass (weight) when stowed in cargo space. SF expresses the unit in cubic meters (m³) or cubic feet. SF is a unit of measurement that indicates how much space (volume) a particular unit of cargo occupies in a ship's cargo compartment
Solute and solvent in pasta
Answer:
It depends on what kind of pasta it is
If the chemical reaction AB + CD ⟶ AD + BC releases heat, what is true of the stored bond energy of the reactants and products? The bonds do not have energy, the atoms release heat. The bond energy of the reactants is the same as the bond energy of the products. The bond energy of the reactants is lower than the bond energy of the products. The bond energy of the reactants is higher than the bond energy of the products.
Answer:
The correct option is the last option
Explanation:
The chemical reaction provided in the question is a double-displacement reaction which is an exothermic reaction (which is the reason for the release of heat). An example of a double displacement reaction and exothermic reaction is the neutralization reaction illustrated below.
HCl + NaOH ⇒ NaCl + H₂O
From the law of conservation of energy, energy can neither be created nor destroyed, hence the total energy in a given system should ordinarily be the same (in the reactants and products), however when energy is released in a reaction (as in the case with an exothermic reaction), it shows there are more bond energy in the reactants than in the products and it is the excess energy that is been released into the atmosphere.
Give two examples of rocks composed of only one material.
Answer:
pyroxenite, quartzite, dunite (over 90% olivine), anorthosite (over 90% plagioclase feldspar), marble, chalk, gypsum
Explanation:
Which wave has the greatest distance from trough to trough?
Answer:
C.C
Explanation:
Just took the test
A transverse wave is a motion in which all points on a wave oscillate along paths at right angles. Hence, option C is correct.
On a wave, what is the distance from trough to trough?The wavelength is the horizontal distance between two adjacent crests or troughs.
The longest distance a particle goes from rest is to the peak of a crest or the bottom of a trough in a transverse wave. The amplitude of a transverse wave is this distance.
Hence, option C is correct.
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Uranium is a type of atom. In special circumstances that usually involve high amounts of energy, uranium can be broken. When this occurs, different pieces of the original atom remain, including a substance called plutonium. Which statement most likely describes plutonium? It will still be uranium, just smaller pieces of uranium. It must no longer be a form of matter. It must be a different kind of atom. It will be different than, but have the same properties as, uranium.
Answer:
It's c
Explanation:
I'm taking the test now on edge.
It must be a different kind of atom statement mostly likely describes plutonium. Hence option C is correct.
What are atoms?It is the smallest unit of matter that possess the properties of the chemical element. It can’t be an independently, they form ions and molecules they both are combine and form large numbers of matters.
Atoms are basically three types: Neutrons, protons and electrons.
In periodic table plutonium is above uranium. Plutonium is more powerful as compared to uranium because it is an isotope and more radioactive.
Almost all of naturally occurring. Uranium 92U238with a half-life of 4.468 x 109 year. Most rest of the natural uranium is92U235.
Uranium is generally used in the process of nuclear fission whereas plutonium is used for the production of nuclear weapons.
It must be a different kind of atom statement mostly likely describes plutonium. Hence option C is correct.
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Help me please, i’d appreciate it a lot! thank you!❤️
Explanation:
think so it is useful and sufficient for your question
PLEASE PLEASE ANY CHEMISTRY EXPERT!! HELP NEEDED. See attached.
Determine whether each pair of compounds forms a homogeneous solution when combined. For those that form homogeneous solutions, indicate the type of forces that are involved.
Answer:
Explanation:
1st) one are homogenous because the have the same kind of force 9 London force ) all the hydrocarbons are nonpolar and have a London force between their molecules
so pentane dissolve in hexane (like dissolves like )
2nd ) CBr4 has a tetrahedral shape its a nonpolar compound (London bond )
but the water is polar molecules has a ( hydrogen bond ) its molecular shape (bent shape) . Both do not dissolve in each other because they have a different kinds of bond so they are not a homogenous solution .
3rd) its a homogenous because the water can dissolve the ionic bonds between the Li ( cation ) and (NO3 -1 anion ).
4th ) here we can say alcohol can dissolve in a little amount why ?
pentane has a London force bond Alcohol has two different parts first part has OH making hydrogen bond which cant dissolve in the pentane different kinds of bonds ,and the other part -CH3 has a London force bond that can dissolves easily in the pentaneso one part dissolves but the other part can't dissolve so the two compound are slightly dissolves in each other that which mean its not a homogenous solutionWhy are alkalis sometimes
described as the opposite of
acids?
Answer: Because Alkalis are bases that can dissolve in water, which can also neutralize acid.
Give two real life applications of chromatography
Answer:
Food testing.
Beverage testing.
Drug testing.
Forensic testing.
Answer:
1. Additive detection
2. Crime scene testing
Which of the following is characteristic of grasslands, but not savannas? a. wide temperature range b. two seasons c. droughts and fires d. wet and dry seasons
Answer:
wide temperature range
Explanation:
Grasslands are ecosystem that covers grass and herbs. It can occur in any type of climates. The rainfall is low in grasslands but it is periodic. The temperature in the summer can exceed 100 degrees Fahrenheit in grasslands.
Savannas is a type of grasslands. It is also known as tropical grasslands. They have average annual temperatures that only vary between 70 and 78 degrees Fahrenheit.
It can be concluded that, out of the given options, that shows the characteristic of grasslands, but not savannas is option (a) " wide temperature range".
Answer: A. wide temperature range
Explanation: Got it correct on the Edgenuity 2020 quiz :)
Which of the following pairs of elements are most likely to form an ionic bond?
A- Br and Ca
B- Br and N
C- Ca and Mg
D- Ca and Fe
Answer:
Ionic bonds ussally form with a metal, and a non metel elements, so the answer would most likley be B.
Explanation:
hope I could help
john has a solution with a pH of 12.21. what is the hydrogen ion concentration of this solution?
Answer:
In this way, ph is determined by hydrogen ion concentration . In the case of neutral solution [H+] =10-7 which we call a ph of 7. This means, for example, that a hydrogen-ion concentration of a solution with a ph of 4 is 10-4 mol/l, meaning it contains 0.0001 mole of hydrogen ion in a solution of 1 liter.
An element is an arrangement of atoms in a particular way; True or False?
Answer:
i think it's true because An element is a substance that is made entirely from one type of atom
Can you help me answer the question ?
In an atom of an element there are a fixed number of electrons. If the total mass of electrons in 1 mole (6.022 x 1023) of atoms of a certain element is 18.65 mg, how many protons must there be in the nucleus of that atom? (mass of electron = 9.109 x 10–28 g).
Answer:
No. of protons = 34
Explanation:
First we need to calculate the number of electrons in one mole of the the element:
No. of electrons per mole = Total Mass of Electrons/Mass of 1 Electron
No. of electrons per mole = (18.65 x 10⁻³ g)/(9.109 x 10⁻²⁸ g)
No. of electrons per mole = 2.04 x 10²⁵ electrons/mol
Now, we calculate the no. of electrons in 1 atom:
No. of electrons per atom = No. of Electrons per mole/No. of atoms per mole
No. of electrons per atom = (2.04 x 10²⁵ electrons/mol)/(6.022 x 10²³ atoms/mol)
No. of electrons per atom = 34 electrons/atom
Since, the no. of protons in a pure element are equal to the number of electrons. Therefore,
No. of protons = 34
In this exercise we have to use the knowledge of atoms to calculate the number of protons, in this way we find:
Protons will be 34
First we need to reckon the number of electrons fashionable individual blemish of the the place where one feels comfortable:
[tex]electrons \ per \ mole = Total\ Mass\ of \ Electrons/Mass\ of\ 1 \ Electron\\ electrons\ per\ mole = (18.65 * 10^{-3} g)/(9.109 * 10^{28} g)\\ electrons \ per \ mole = 2.04 x 10^{25} electrons/mol[/tex]
Now, we plan on the electrons in 1 smallest part of something:
[tex]electrons\ per\ atom = Electrons\ per\ mole/atoms\ per\ mole\\ electrons\ per\ atom = (2.04 * 10^{25} electrons/mol)/(6.022 * 10^{23} atoms/mol)\\ electrons\ per\ atom = 34 electrons/atom [/tex]
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What are the components of the water-based carbon cycle?
Answer:
Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate.
Explanation:
ur welcome
Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate.
What is the carbon cycle?The carbon cycle describes how carbon moves between the atmosphere, soils, living creatures, the ocean, and human sources.
Carbon gets incorporated into marine organisms as organic matter or structural calcium carbonate. When organisms die, their dead cells, shells and other parts sink into deep water. Decay releases carbon dioxide into this deep water.
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What ions are present in an aqueous solution of NiCl2?
Answer:
Ni²⁺ and Cl⁻ ions
Explanation:
NiCl₂ is an ionic compound which is composed by 2 chloride ions (Cl⁻) and 1 nickel (II) ion (Ni²⁺). It dissociates in water as follows:
NiCl₂ ⇒ Ni²⁺ + 2 Cl⁻
Therefore, in an aqueous solution of NiCl₂ will be present Ni²⁺ ions and Cl⁻ ions.
7. What happen if we don't have water?
Answer:
our bodies will dehydrate causing us to die a dreadfully excruciating painful death
. A certain medication is set to deliver through an IV at a rate of 3.0 mg/min. What is this rate in mg/s?
Answer:
[tex]rate=0.05\frac{mg}{min}[/tex]
Explanation:
Hello,
In this case, considering that 1 min equals 60 seconds, we need to perform the unit conversion as shown below in order to compute the rate on mg/s:
[tex]rate=3.0\frac{mg}{min}*\frac{1min}{60s} \\ \\rate=0.05\frac{mg}{min}[/tex]
Best regards.
Was the french revolution driving force behind the metric system?
Answer:
yes, they were
Explanation:
The history of the metric system began in the Age of Enlightenment with notions of length and weighttaken from natural ones, and decimal multiples and fractions of them. The system became the standard of France and Europe in half a century. Other dimensions with unity ratios[Note 1] were added, and it went on to be adopted by the world.
Question 1 (Multiple Choice Worth 2 points)
(01.01 LC)
The strength of gravitational force is affected by the distance between objects and which of the following?
O Weight
O Speed
O Density
O Mass
Please help me with this? :(
Answer:
1. Diagram C.
2. Diagram A.
Explanation:
1. Calcium atom, Ca has 20 protons and 20 electrons. On the other hand, Calcium ion, Ca^2+ has 20 protons and 18 electrons. This is true because the +2 charge on the calcium ion, Ca^2+ indicates that the calcium atom, Ca has loss 2 electrons.
From the above illustration we can say that calcium ion, Ca^2+ has the following:
Proton = 20
Electron = 18
Therefore, diagram C indicates calcium ion, Ca^2+.
2. Fluorine atom, F has 9 protons and 9 electrons. Fluoride ion, F¯ has 9 protons and 10 electrons. This is so because the –1 charge on the fluoride ion, F¯ indicates that the fluorine atom, F has gained 1 electron.
Thus, we can say that the fluoride ion, F¯ has the following:
Proton = 9
Electron = 10
Therefore, diagram A represent fluoride ion, F¯.