When heating the solution to boiling on the hot plate , start by starting and the stabilizing the stir function.
When we heat the solution to boil on the hot plate , it start by starting and the stabilizing the stir function. Then, turn the heat to a medium heat setting to start. If necessary, turn up the heat setting after waiting about ten minutes without seeing boiling.
The safety precautions that taken when heating the solution to boiling on a hot plate is to take proper inspection of the bottom flask for the cracks, irregularities or any of the imperfection.
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The reaction between sulfur dioxide and oxygen is reversible. 2SO2(g) + O2(g) = 2SO3(g) Kc=280mol^-1 dm^3 at 1000K In an equilibrium mixture at 1000K the sulfur trioxide concentration is 6.00 mol dm^-3. What is the sulfur dioxide concentration? A) 0.175 mol dm^-3 B) 0.254 mol dm^-3 C) 0.318 mol dm^-3 D) 0.636 mol dm^-3
Answer:
0.636 mol/dm³
Explanation:
A football player runs in a straight line down the field, crossing the 20-yard line when the stopwatch reads 12 seconds and crossing the 70-yard line when the stopwatch reads 17 seconds. What is his speed in yards per second?
please show how u did it too bc my teacher is pretty specific
The speed of the football player in yards per seconds is 3.10 yard line per second.
How to calculate speed?Speed refers to the rate of motion or action, specifically the magnitude of the velocity. It is the rate distance is traversed in a given time.
This suggests that the speed can be calculated by dividing the distance of the football player by the time taken.
According to this question, the football player runs in a straight line down the field, crossing the 20-yard line when the stopwatch reads 12 seconds and crossing the 70-yard line when the stopwatch reads 17 seconds.
Total Distance = 70 + 20 = 90 yard lineTotal time = 12 + 17 = 29 secondsSpeed = 90 ÷ 29 = 3.10 yard line/seconds
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What is the molar mass of 2 moles of H2O?.
The molar mass of H₂O is 18 g/ moles, in 2 moles there are 36 g.
A substance's atomic mass is essentially the sum of the masses of its protons and neutrons. A molecule may contain more than one atom; in this case, the molecular mass is the sum of the masses of all the atoms in the molecule. Now, the unit is transformed into grams for the number of moles (g).
For instance, we all know that the atomic mass of oxygen is 16 g/moles, the molecular mass of Hydrogen is 1 g/moles
so the mass molar of H₂O is 16g/moles +2 (1 g/moles) = 18 g/ moles so in 2 moles of H₂O there are 36 g
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which size of micropipette would you select to deliver 215 microliters?
The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.
What is a micropipette?
A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.
Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.
Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.
It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.
Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.
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What is the kinetic energy of a 2000 kg ball moving at 5 m s?.
25000 J or 25kJ is the kinetic energy of a 2000 kg ball moving at 5 m/s.
KE= [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]
Kinetic energy is equal to [tex]\frac{1}{2}[/tex] * mass * [tex]velocity^{2}[/tex].
where kg represents kilogrammes and mass
Its speed is measured in metres per second (m/s).
here, m= 2000
v = 5
[tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex] = 1/2 ⋅2000 ⋅ 25
= [tex]\frac{50000}{2}[/tex]
= 25000
KE = 25000 J or 25kJ
Kinetic energy is the energy an object has while in motion. An object can only be accelerated by the application of a force. Applying force requires effort on our part. Energy is transmitted to the object once the work is accomplished, at which point it moves at a new, constant speed. Kinetic energy is a type of energy present in moving particles or objects. For such more questions on Kinetic energy:
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Some ionic compounds do not dissolve in water because too much energy is required t0 break apart te and not enough energy is gained by the ions Select one: a. bonds, slow b. Structure, moving c. molecule, dissolving d. ionic lattice hydrating
(d.) ionic lattice hydrating. Because water's lattice energy and hydration energy differ from one another, ionic compounds dissolve in it. Ions with opposing charges attract each other, while ions with like charges repel one another.
Ionic substances are ionic compounds. These ions are made up of atoms with an overall positive or negative charge as a result of electron gain or loss. Because they frequently lose electrons, metals acquire a net positive charge and change into cations. Non-metals frequently acquire electrons, giving anions a net negative charge. results in ionic, or electrovalent, compounds; they are best represented by the mixtures of nonmetals and alkali and alkaline-earth metals. A compound known as an ionic compound is one that is created when two oppositely charged ions come together to form a chemical bond, such as sodium chloride.
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What is the mass of 3.5 moles of CaCl2?
To solve this we must be knowing each and every concept related to mole and and its calculations. Therefore, 388.15g is the mass of 3.5 moles of CaCl[tex]_2[/tex].
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
mole =given mass ÷ molar mass
moles of CaCl[tex]_2[/tex] = 3.5 moles
Molar mass of CaCl[tex]_2[/tex] =110.9g/mol
mass of CaCl[tex]_2[/tex] =3.5 moles × 110.9g/mol
=388.15g
Therefore, 388.15g is the mass of 3.5 moles of CaCl[tex]_2[/tex].
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Biodiversity, aka biological diversity, usually refers to
1)The same species in a general location
2)The number of different species in a given area
3)The number of plant species in a given area
4)The number of animal species in a given area
What happens to the carbonyl peak in a ring as the size of the ring contracts? A. Peak wavenumber shifts right by 60 for every carbon atom removed B. Peak wavenumber shifts right by 30 for every carbon atom removed C. Peak wavenumber shifts left by 60 for every carbon atom removed D. Peak wavenumber shifts left by 30 for every carbon atom removed
Carbonyl peak in a ring as the size of the ring contracts will B. Peak wavenumber shifts right by 30 for every carbon atom removed .
In general ,carbonyl group C=O is having a larger dipole moment and hence it is intense in stretching and vibration these peak generally appears from 1900 to 1600. As a result, an aromatic ring is attached to a carbonyl carbon, the C=O. Also a stretching peak position is lowered due to the phenomenon of conjugation.
Also , carbonyl group act in the functional role for diminishing the bonds within the carbon chain. That makes electronegative oxygen atom to attract more electrons with the carbon it is bonded and within the carbonyl group.
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A bucket of water holds 5.00 gallons. How many milliliters is this?
all about alcohols
it's reaction and synthesis
Alcohols are organic compounds that contain a hydroxyl (-OH) group bonded to a carbon atom. They can be classified as primary, secondary, or tertiary based on the number of carbon atoms bonded to the carbon atom bearing the hydroxyl group.
What are the reactions performed by alcohols?Reactions of alcohols include:
Dehydration - the removal of water from the alcohol to form an alkene or alkyne.
Oxidation - the process by which the alcohol is converted into a more highly oxidized compound such as a carboxylic acid or a ketone.
Substitution - the replacement of the hydroxyl group with another group, such as a halogen.
Esterification - the reaction of an alcohol with a carboxylic acid to form an ester.
Synthesis of alcohols can be done through a variety of methods including:
Hydrolysis of alkyl halides or alkyl sulfates.
Reduction of aldehydes, ketones, or carboxylic acids.
Fermentation of sugars using yeast or bacteria.
Grignard reaction - the addition of a Grignard reagent (a Organo magnesium compound) to a carbonyl compound.
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if metal x is lower than metal y in the activity series, then____
If metal x is lower than metal y in the activity series, then metal x replaces ions of metal y in a solution and loses electrons more readily than metal y.
The activity series or also known as the reactivity series is a list of elements that are arranged in the order of their decreasing reactivity. Because metals replace other metals and nonmetals replace other nonmetals, each has its own activity series.
Metals and halogens are ranked in the activity series based on their ability to displace other metals or halogens below them.
There are single replacement reactions occurring in nature that only occur when the element that is doing the replacement is more reactive than the element that is being replaced. Therefore, it is important for the activity series to exist.
There are elements placed in the activity series which react with cold water, steam, and even acids.
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arrange these species from fastest sn2 reaction rate to slowest sn2 reaction rate.Bank bromomethane 1-bromo-3-methylbutane 2-bromo-2-methylbutane 2-bromo-3-methylbutane
The SN2 reaction is a type of nucleophilic substitution reaction in which a nucleophile (Nu) attacks the carbon atom of a substrate (S) from the back side, causing the inversion of configuration and the formation of a new carbon-nucleophile bond.
How to arrange these species from fastest sn2 reaction rate to slowest sn2 reaction rate?The rate of the reaction depends on several factors such as the nature of the nucleophile, the substrate, and the leaving group. In general, the reaction rate increases as the nucleophile becomes more basic, the substrate becomes more polarizable and the leaving group becomes more weakly basic.The order of the reaction rate for the given species is:1-bromo-3-methylbutane > 2-bromo-2-methylbutane > 2-bromo-3-methylbutane > bromomethane1-bromo-3-methylbutane has the fastest reaction rate because it has the most stable carbocation intermediate, due to the presence of the methyl group, which inductively stabilizes the intermediate.2-bromo-2-methylbutane has a faster reaction rate than 2-bromo-3-methylbutane because it has the most stable carbocation intermediate, due to the presence of the methyl group, which inductively stabilizes the intermediate.2-bromo-3-methylbutane has a faster reaction rate than bromomethane because it has a more stable carbocation intermediate due to the presence of the methyl group, which inductively stabilizes the intermediate.Bromomethane has the slowest reaction rate because it has a less stable carbocation intermediate due to the absence of any methyl groups that would inductively stabilize the intermediate.It's important to note that the order is based on the stability of the carbocation intermediate, and not the nucleophile.To learn more about reaction rate refer:
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which of the given purposes is the tlc method most often used for?
Thin layer chromatography (TLC) is an affinity derived approach that works to separate compounds in a mixture. TLC is deeply versatile separation method used for both qualitative and quantitative sample analysis.
In general, Thin layer chromatography is performed by using a thin, uniform layer of silica gel or alumina coated onto a piece of glass, metal or rigid plastic. These silica gel is present in stationary phase. There are three most important industrial applications that thin layer chromatography has are clinical, pharmaceutical, and food testing approaches. One of the most common specific types of clinical tests performed with TLC is for the presence of drugs of abuse.
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PLEASE HELP FAST!!If metal X is lower than metal Y on the activity series, then:A. X will react in water, but only if the temperature is low enoughB. Y will form oxides of X, but only indirectlyC. X will replace ions of Y in a solutionD. Y will replace ions of X in a solution
If metal X is lower than metal Y on the activity series, then: A are listed below.
What is metal?
Contrary to alloys, a chemical element is any of a wide range of opaque, fusible, ductile, and generally glossy materials that are good conductors of electricity and heat, yield basic oxides and hydroxides through the loss of electrons, and form cations.
What is ion ?
When ions are positively charged, we refer to them as cations. Ions with a negative charge are known as "anion" particles. Ions of several common substances can be found in the body. Salt, bicarbonate, potassium, calcium, and chloride are common examples.
Reactivity series, for instance, places copper (Cu) higher than silver (Ag). So, in a single replacement/displacement reaction, copper will replace/displace silver.
Cu(s) + 2AgNO 3 (aq) 2Ag(s) + Cu(NO3) 2 (aq)
Silver is positioned below copper in the reactivity series, hence the reverse reaction won't occur.
Cu(NO 3 ) 2 and Ag (s) don't react in aqueous form.
Therefore, if metal X is lower than metal Y on the activity series, then: A are listed above.
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How much energy is required to raise the temperature of 3 kg of lead from 15
°C to 20°C? Use the table below and this equation: Q = mc&T.
Write the subatomic particles in the order that they were discovered. Do not include commas
Answer:
This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance.
More specifically, the inclusion criteria are:
Elementary particles from the Standard Model of particle physics that have so far been observed. The Standard Model is the most comprehensive existing model of particle behavior. All Standard Model particles including the Higgs boson have been verified, and all other observed particles are combinations of two or more Standard Model particles.
Antiparticles which were historically important to the development of particle physics, specifically the positron and antiproton. The discovery of these particles required very different experimental methods from that of their ordinary matter counterparts, and provided evidence that all particles had antiparticles—an idea that is fundamental to quantum field theory, the modern mathematical framework for particle physics. In the case of most subsequent particle discoveries, the particle and its anti-particle were discovered essentially simultaneously.
Composite particles which were the first particle discovered containing a particular elementary constituent, or whose discovery was critical to the understanding of particle physics.
Explain the usages and properties of these 6 organic compounds.
Cellulose
is used in writing and taking recordsProperties - it is adsorbent material.Nitrocellulose
is used to paint nailsit is a volatile liquidWax
it is used for making candles and for coating surfacesIt is a solid and melts when burning to release carbon dioxideNylon
It is used to produce clothes and fabricsIt is a polymer and toughFatty acids
It is used in making soapsIt is acidic in natureMixed hydrocarbons
They are used as fuelsThey are highly combustible materialsWhat are organic compounds?Any chemical compound that has carbon-hydrogen or carbon-carbon bonds is considered an organic compound.
Examples of organic compounds are:
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Why CCl4 is nonpolar but ch3cl is polar?.
Because the dipole moment of one polar bond does not cancel out the dipole moment of additional polar bonds, CH₃Cl molecules are polar.
The symmetrical molecule known as carbon tetrachloeide has a consistent tetrahedral structure. As a result, the bonds' polarises cancel out, making the molecule non-polar. The geometry of methyl chloride, on the other hand, is irregular because it has one C-Cl link.
Because the Cl atoms have an electron-withdrawing action, the C-H bond in CHCl₃ is very polarised. With ô+ H and ô- Cl, CHCl₃ exhibits a sizable dipole moment. There is no dipole moment in CCl₄. Despite the fact that each C-Cl bond is somewhat polar, the molecule's tetrahedral structure cancels out all of the bond dipoles.
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A solution is made by mixing 50 ml of a stock solution of 2. 0 m k2hpo4 and 25 ml of a stock solution of 2. 0 m kh2po4. The solution is diluted to a final volume of 200 ml. What is the final ph of the solution? give your answer to 2 decimal places. (pka = 6. 82, based on phosphoric acid titration).
Answer: The pH of the final solution is 7.12.
What is the Henderson Hasselbalch equation?
The Henderson-Hasselbalch equation relates the pH (in an aqueous solution) of an acid to its pKa (acid dissociation constant). The pH of a buffer can be estimated using this equation if the concentrations of an acid and its conjugate base, or a base and the corresponding conjugate acid, are known.
It is given by the formula:
[tex]pH = pKa + log\frac{[salt]}{[Acid]}[/tex]
Apply Henderson-Hasselbalch equation:
pH = pKa + log [K2HPO4] / [KH2PO4]
[K2HPO4] = (50 x 2 / 200) = 0.5 M
[KH2PO4] = (25 x 2.0 / 200) = 0.25 M
pH = 6.82 (given) + log [0.5] / [0.25]
pH = 7.12
Therefore, the final pH is 7.12.
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Refor Explain the shape of the curve Between A and B (2 marks) a) At Point C (2 marks) in) Between C and D (2 marks) 20 00 Temperature (°C)
Answer:
hhyýuhhhí7
Explanation:
Morang District Coordination Committee (DCC), formerly called Morang District is located in Province 1 of the eastern region of Nepal. It borders with Bihar (India) to the South, Jhapa to the East, Dhankuta & Panchthar to the North and Sunsari to the west. Morang has one Sub-Metropolitian (Biratnagar), eight municipalities and 8 rural municipalities. The total area of Morang is 1,855 km2. The lowest elevation point is 60 meter and highest elevation point is 2410 meter above sea level. The headquarter of Morang is connected by Koshi National High way to the East-West Mahendra National Highway at Itahari, Sunsari, and Morang is also connected to the Hill parts of the eastern region of Nepal. Morang is the core Industrial sector for the eastern region of Nepal
Chemical formula of protein
Answer:
Although amino acids may have other formulas, those in protein invariably have the general formula RCH(NH2)COOH, where C is carbon, H is hydrogen, N is nitrogen, O is oxygen, and R is a group, varying in composition and structure, called a side chain.
Explanation:
(◕ᴗ◕✿)(◕ᴗ◕✿)(◕ᴗ◕✿)
How would I balance this?
The balance chemical reaction is as below:
4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)
What is balance chemical reaction ?The term balanced chemical equation is defined when the number of the atoms involved in the reactants side is exactly equal to the number of atoms in the products side.
The most important thing about balancing chemical equations is to satisfy the law of conservation of mass, This states that “the total mass of the products is exactly equal to the total mass of all the reactants”
Thus, The balance chemical reaction is as below:
4Fe (s) + 3O₂ (g) ⇒ 2Fe₂O₃ (s)
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how many molecules are there in one mole of co2 gas?
One mole of carbon dioxide ([tex]CO_{2}[/tex]) contains 6.022×10^23 molecules.
This number is referred to as Avogadro's number and it is the same for any substance.
To put it another way, one mole of a substance is equal to 6.022×10^23 atoms, molecules, or other particles of that substance. In the case of [tex]CO_{2}[/tex], a one mole sample contains 6.022×10^23 molecules.
To explain further, when the number of molecules of a substance is known, the mass of that substance in grams can be determined.
The mass of one mole of carbon dioxide, [tex]CO_{2}[/tex] is 44.01g, which means that one mole of [tex]CO_{2}[/tex] contains 44.01g/6.022×10^23 molecules or 7.316×10^-23g/molecule. This is the average mass of a [tex]CO_{2}[/tex] molecule.
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It is required to make 20 grams of certain chemical compound called z. This is made from compounds w, x, and y in the ratio of 2:1:3. The compound y is itself made from w and x. To make 6 grams of y requires 4 grams of w and 2 grams of x. How much w and x is required to make the required amount of z.
9.32 grams of W and 4.66 grams of X are required to make the required amount of z.
What is a compound?
A compound is a material created by the chemical joining of two or more distinct components. Examples of compounds are table salt (NaCl), which is formed of the elements sodium and chloride, and water (H2O), which is made of the elements hydrogen and oxygen.
Given;
Mass of Z = 14 grams
W:X:Y = 2:1:3
4 grams of W and 2 grams of X are required to make 6 grams of Y
W:X = 4:2 = 2:1
Substituting the composition of Y to Z
Z = W:X:Y = 2:1:3
We have;
Z = W:X = 4:2 = 2:1
The final mixing ratio for W and X are 2:1,
To make 14 grams of Z, we need;
W = 2/3 × 14grams = 28/3 grams
W = 9.33 grams
X = 1/3 × 14grams = 14/3 grams
X = 4.67 grams
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PLEASE HELP ASAP!!!
ANSWER FOR PHOTO 1
STUDENT 1
STUDENT 2
STUDENT 3
STUDENT 4
ANSWERS FOR PHOTO 3
A
B
C
D
The student that gave the correct response is student 3.
What is the correct response?We know that there are three main subatomic particles that we can be able to find in the atom and these are;
ProtonsElectronsNeutronsWe know that the electrons can be classified in to groups based on the valence electrons that the elements have and this is what we can be able to use to judge the reactivity of the atoms of the elements as we know in chemistry.
Hence, the valence electrons determine the chemical reactivity of the atom.
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How many molecules are in 1g of oxygen?.
One mole of a substance contains Avogadro's number of atoms or molecules, which is approximately 6.022 x 10²³. Therefore, 1 gram of a substance contains the same number of atoms or molecules as its molar mass in grams.
The molar mass of oxygen (O2) is 32 grams per mole. Therefore, there are approximately 6.022 x 10²³ molecules in 1 gram of oxygen.
Avogadro's number is a fundamental constant of chemistry that is used to define the number of atoms, ions, or molecules in one mole of a substance. Avogadro's number is approximately 6.022 x 10²³, which is the same as saying that one mole of a substance contains 6.022 x 10²³ atoms, ions, or molecules.
This relationship between the number of atoms, ions, or molecules in a substance and the number of moles of that substance is known as Avogadro's Law.
For example, a mole of oxygen gas (O2) contains 6.022 x 10²³ oxygen molecules. Since the molar mass of O2 is 32 g/mol, 1 gram of O2 contains 6.022 x 10²³÷ 32 = 1.8605 x 10²³ oxygen molecules.
This relationship can be useful in many areas of chemistry and physics, such as calculating the number of atoms in a sample of a substance, determining the concentration of a solution, and more.
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Why energy efficiency is so important nowadays explain?.
With the rising cost of energy and the growing demand for electricity, energy efficiency has become increasingly important.
Finding ways to reduce electricity usage and increase efficiency can save money in the long run, while also having a positive impact on the environment.
There are a number of different methods to help increase energy efficiency, such as using energy-efficient appliances, making sure your home is properly insulated, and utilizing energy-saving strategies such as turning off lights and unplugging appliances when not in use.
Additionally, you can take advantage of energy-saving programs offered by local utilities, or even install renewable energy systems such as solar panels.
By taking steps to become more energy efficient, you can help reduce your energy bills, protect the environment, and ensure a sustainable future.
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How many molecules are in 1.2 moles of H₂O?
Cuanto tiempo demorara un competidor en recorrer 500 metros planos, avanzando a 5 m/s
The length of time it takes a competitor to cover a distance of 500 meters flat, the speed at 5 m/s is 100 seconds.
Speed is a quantity that indicates how fast an object is moving. The International Unit of Speed is m/s
Distance is a number that indicates how far an object changes position. The international unit of distance is the meter (m).
Time is the interval between two states/events, or it can be the duration of an event. Unit of Time seconds or seconds (s).
How to calculate the travel time, namely the distance traveled divided by the speed.
t = s/v
Formula Description:
s = Distance traveled (m, km)
t = Travel time (hours, seconds)
v = Speed (km/h, m/s)
Then the time needed is
t = s/v
t = 500m/ 5m/s
t = 100 seconds
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