If a bike messenger travels 16 kilometers in a time of 8 minutes, what is her average speed?

Answers

Answer 1

Answer:

Explanation:

16 ÷ 8 = 2

Related Questions

If you assumed 100 total atoms in a sample, how could you relate the % values
shown in the sim into a number you could use for your calculation of average
masses?

Answers

Answer:

use the percent as the abundance and multiply it by the atomic mass and add the values together

Explanation: idk but i got it from quizlet

We have that the % values shown in the sim into a number you could use for your calculation of average masses is given as

[tex]Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}[/tex]

From the question we are told

If you assumed 100 total atoms in a sample, how could you relate the % values shown in the sim into a number you could use for your calculation of average masses?

Generally

We will consider that the 100 total atoms as the the atoms at a 100 percent

The substance at a 100 atoms is to be calculated and is to be given as

Generally the equation for the average atomic mass is mathematically given as

[tex]Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}[/tex]

Therefore

Now, the % values shown in the sim into a number you could use for your calculation of average masses is given as

[tex]Avg M=\frac{\sum(atomic masses of every existing element)}{100 atoms}[/tex]

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Describe the composition of Earth’s atmosphere

Answers

Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere

Write balanced, net ionic equations for the following precipitation, acidn base, or gasn forming reactions. Include states of matter. Hint: You should write the molecular equation first to predict the products. a) mixing aqueous solutions of iron (III) chloride and lithium sulfide b) mixing aqueous solutions of sodium acetate and ammonium phosphate c) mixing aqueous solutions of perchloric acid and potassium hydroxide d) mixing aqueous solutions of ammonia and nitric acid e) mixing aqueous solutions of nitrous acid and sodium hydroxide f) adding aqueous hydroiodic acid to solid calcium carbonate g) Problems c) through f) are acid- base reactions. Comment on the differences in the net ionic equations for these reactions.

Answers

Answer:

Explanation:

a ) 2FeCl₃ + 3Li₂S = Fe₂S₃ ( s ) + 6 LiCl

2Fe⁺³ + 6Li ⁻ + 6Cl⁻ + 3S⁻² = 6Li + 6Cl⁻ + Fe₂S₃ ( s )

b )

3CH₃COONa +( NH₄)₃PO₄ = 3CH₃COONH₄ + Na₃PO₄

3CH₃COO + 3Na⁺ + 3NH₄⁻ + PO₄⁺³ = 3CH₃COO⁻ +3NH₄⁺ + Na₃PO₄

c )

HClO₄ + KOH = kClO₄ + H₂O

H ⁺ + ClO₄⁻ + K⁺ + OH⁻ = k⁺ ClO₄⁻ + H₂O

d )

NH₄OH + HNO₃ = NH₄NO₃ + H₂O

NH₄⁺ + OH⁻ + H⁺ + NO₃⁻ = NH₄⁺ + NO₃⁻ + H₂O

e )

HNO₂ + KOH = KNO₂ + H₂O

H⁺ + NO₂⁻ + K⁺ + OH⁻ = K⁺ + NO₂⁻ + H₂O

f ) HIO₃ + CaCO₃ ( s ) = Ca( IO₃ )₂ + H₂CO₃

H⁺ + IO₃⁻ + CaCO₃ ( s ) = Ca( IO₃ )₂ + H₂CO₃

g )

c ) is strong acid and strong base

d ) is weak base and strong acid

e ) weak acid and strong base

f ) Strong acid and basic salt

For clouds to form, water must vapor

Answers

Answer:

true

Explanation:

Compare the oxygen consumption of a sprinter and a marathon runner

pls give accurate answer
and answer it quickly.

Answers

Answer:

A sprinter consumes more oxygen than a marathon runner.

Explanation:

A sprinter requires big amounts of air in a short time to not get tired as fast and run faster. A marathon runner has more controlled and paced breathing so he does not get tired but can run long distances. Marathon runners also run slower than sprinters.

. A protein has molecular mass of 400 kDa when measured by size exclusion chromatography. When subjected to gel electrophoresis in the presence of sodium dodecyl sulfate (SDS), the protein gives three bands with molecular masses of 180, 160, and 60 kDa. When electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are again formed, this time with molecular masses of 160, 90, and 60 kDa. Determine the subunit composition of the protein.

Answers

Answer:

The protein has 4 subunits: 2 subunits of 90 kDa, 1 subunit of 160 kDa and 1 subunit of 60 kDa

Explanation:

In gel electrophoresis, the SDS agent produces denaturation of the protein and confers negative charge, so the protein subunits can migrate according to their masses. It produces dissociation of the protein in its subunits but it cannot disrupt disulphyde bridges (S-S) that can bond subunits together.

From the data, with SDS we observe 3 bands ⇒ 180 kDa + 160 kDa + 60 kDa

The addition of dithiotreitol (DTT), a reducing agent, produces the disruption of disulphyde bridges. From the data:

With DTT ⇒ 160 kDa + 90 kDa + 60 kDa

We observe that 160 kDa and 60 kDa subunits are conserved (they are the same as with SDS only), but 180 kDa subunit is missing and in its place appears a band of 90 kDa - a half 180 kDa.

So, the band at 180 kDa is composed by two subunits bonded by a disulphyde bridge.

Therefore, the composition of the protein is: 1 subunit of 160 kDa, 2 subunits of 90 kDa and 1 subunit of 60 kDa.

The temperature of a container of oxygen gas is increased from 149 k to 298 k which of the following statement is true, Explain:

A. The average kinetic energy of the oxygen molecules in the container decreases.
B. The average chemical potential energy of the oxygen molecules in the container increases.
C. The average kinetic energy of the oxygen molecules in the container increases.
D. The average chemical potential energy of the oxygen molecules in the container decreases.

Answers

Answer:

The average kinetic energy of the oxygen molecules in the container increases

Explanation:

I searched up, "what happens when the temperature of oxygen gas is increased''

As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.

this is the answer google gave me so im not sure of you should 100% trust it but its better than nothing

The temperature of a container of oxygen gas is increased from 149 k to 298 k then the average kinetic energy of the oxygen molecules in the container increases. Thus option C is true.

What is kinetic energy?

A kinetic energy is defined as a form of energy that an object or particle has by its motion.

It can be expressed as

K.E. = 1/2 mv²

There are basically three types of kinetic energy.

Translational kinetic energyRotational kinetic energyVibrational kinetic energy

The average kinetic energy is a product of half of the mass of each gaseous molecules.

The average kinetic energy is directly proportional to temperature.

Thus, the temperature of a container of oxygen gas is increased from 149 k to 298 k then the average kinetic energy of the oxygen molecules in the container increases. Thus option C is true.

To learn more about kinetic energy, refer to the link below:

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Please Help! 100 points!!!!!
In Parts I and II of the lab, what happened to the electrons of each element to produce the different colors of light? Explain your answers using important terms from the lesson and information provided in the laboratory.

Answers

Answer:

In Parts I and II of the lab, what happened to the electrons of each element to produce the different colors of light? ... When heat was added to the elements, the electrons absorbs the energy and moves to its excited state. Once the electron starts to fall back to a lower orbit, it emits energy in the form of light.

Happy to help ☀️Keep on shining☀️

Explanation:

determine the number of moles of KOH present in 95.0 ml of 0.255 M solution

Answers

Answer:

Moles of KOH in 1000 mL solution = 0.255 moles

Moles of KOH in 1 mL solution = 0.255/1000 = 0.000255 moles

Moles in 95 mL solution = (95 * 255)/1000000 = 24225/1000000

Moles of KOH in 95 mL 0.255M solution = 0.024225 moles

The number of moles of KOH present in 95.0 ml of 0.255 M solution is 0.024mol

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a substance can be calculated by multiplying the molarity/concentration of the substance by its volume:

no. of moles = molarity (M) × volume (L)

According to this question, 95.0 ml of KOH is present in 0.255 M solution, hence, the number of moles can be calculated as follows:

Volume of KOH = 95.0ml = 0.095L

no. of moles = 0.095 × 0.255

no. of moles = 0.024mol

Therefore, the number of moles of KOH present in 95.0 ml of 0.255 M solution is 0.024mol.

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Which option is an example of a chemical change?
fireworks exploding
grinding powder
ironing a shirt
melting cheese

Answers

Answer:

the answer would be A. fireworks exploding

Explanation:

I TOOOK The test and i got thisone wrong lol so i reviwed what

i got wrong

Answer:

Fireworks exploding

(yes, i know i'm late UvU )

Until a train is a safe distance from the station it must travel at 5 m/s Once the train is on open track it can speed up
to 45 mls. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (Round your answer to
the nearest whole number)
4 m/s2
5 m/s2
6 m/s2
7 m's?

Answers

Answer:

5 m/s²

Explanation:

From the question given above, it took 8 s for the train to get to a speed of 45 m/s. This simply means the train was maintaining 5 m/s as it travels in order to get to an open track.

Thus, we obtained the following data from the question.

Initial velocity (u) = 5 m/s

Final velocity (v) = 45 m/s

Time (t) = 8 s

Acceleration (a) =.?

Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it can be expressed as:

a = (v – u) /t

Where:

a is the acceleration.

v is the final velocity.

u is the initial velocity.

t is the time.

With the above formula, we can obtain the velocity of the train as follow:

Initial velocity (u) = 5 m/s

Final velocity (v) = 45 m/s

Time (t) = 8 s

Acceleration (a) =.?

a = (v – u) /t

a = (45 – 5) / 8

a = 40/8

a = 5 m/s²

Therefore, the acceleration of the train is 5 m/s².

Answer:

Its B =)

Explanation:

Construct the electron dot diagram for chlorine.
Step 1: Use the periodic table to find the chemical symbol
for chlorine.
The symbol for chlorine is:
СІ
Со
Cr

I will mark u braniest xcl XD

Answers

It’s Cl because chlorine starts with a C and the second letter is a L
also because it’s the symbol for chlorine

The chemical symbol for chlorine is Cl, which is derived from its Latin name "chlorum."

How to explain

The periodic table assigns unique symbols to each element as a shorthand notation. Chlorine is a halogen element with atomic number 17, and its symbol reflects this designation.

It is a highly reactive, greenish-yellow gas at room temperature and is commonly used as a disinfectant and in the production of various chemicals. Chlorine is an essential element in maintaining public health and is widely employed in water treatment processes to kill bacteria, viruses, and other microorganisms.

Answers

Carbon, C, P Block, 2, 6, 12.0107u. 6 protons, 6 electrons, 6 neutrons

Helium, He, S Block, 1, 2, 4.0026u, 2 protons, 2 electrons, 2 neutrons

Germanium, Ge, P Block, 4, 32, 72.64u, 32 protons, 32 electrons, 41 neutrons

Oxygen, O, P Block, 2, 8, 16u, 8 protons, 8 electrons, 8 neutrons

Scandium, Sc, D Block, 4, 21, 44.9559u, 21 protons, 21 electrons, 24 neutrons

Tellurium, Te, P Block, 5, 52, 127.60u, 52 protons, 52 electrons, 76 neutrons

Hydrogen, H, S Block, 1, 1, 1.008u, 1 proton, 1 electron, 0 neutrons

Iron, Fe, D Block, 4, 26, 55.845u, 26 protons, 26 electrons, 30 neutrons

Beryllium, Be, S Block, 2, 4, 9.012u, 4 protons, 4 electrons, 5 neutrons

Vanadium, V, D Block, 4, 23, 50.942u, 23 protons, 23 electrons, 28 neutrons

Silver, Ag, D Block, 5, 47, 108u, 47 protons, 47 electrons, 61 neutrons

Gallium, Ga, P Block, 4, 31, 69.723u, 31 protons, 31 electrons, 39 neutrons

Bromine, Br, P Block, 4, 35, 79.904u, 35 protons, 35 electrons, 45 neutrons

Fluorine, F, P Block, 2, 9, 18.998u, 9 protons, 9 electrons, 10 neutrons

Manganese, Mn, D Block, 4, 25, 54.938u, 25 protons, 25 electrons, 30 neutrons

Strontium, Sr, S Block, 5, 38, 87.62u, 38 protons, 38 electrons, 50 neutrons

Francium, Fr, S Block, 7, 87, 223u, 87 protons, 87 electrons, 136 neutrons