Answer:
v = 1.5 m/s
Explanation:
Given that,
Distance covered by a person, d = 105 m
Time taken, t = 70 s
We need to find the average speed of the person. We know that the average speed is given by :
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{105\ m}{70\ s}\\\\v=1.5\ m/s[/tex]
So, the average speed of the person is equal to 1.5 m/s.
Balance the following reaction:
C2H6(g) + O2(g) → CO2(g) + H2O(g)
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
C[tex]_2[/tex]H[tex]_6[/tex](g) + O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + H[tex]_2[/tex]O(g)
Multiply by 7 on reactant side and by 6 on product side to balance oxygen
C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
Now balance carbon and hydrogen
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
Therefore, the balanced equation is
2C[tex]_2[/tex]H[tex]_6[/tex](g) + 7O[tex]_2[/tex](g) → 4CO[tex]_2[/tex](g) + 6H[tex]_2[/tex]O(g)
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between 316 m/s and 1162 m/s, which has the faster speed
Answer:
1162m/s is the faster speed
Explanation:
The speed is a physical property defined as the distance travelled of an object in determined amount of time.
A speed of 316m/s means the object is travelling 316 meters per second transcurred.
In the same way, the speed of 1162m/s means the object is travelling 1162m per second.
As the second object is travelling more distance per second than the first,
1162m/s is the faster speedThis is science
Can photosynthesis still take place if plants do not receive enough water from the water cycle? Why or why not?
Answer:
No.
Explanation:
Photosynthesis is the light dependent process which must occur for the plant to live. This process also requires water and carbon dioxide. If photosynthesis does not occur, the plant will die.
If plants do not receive enough water from the water cycle, photosynthesis can be affected, and in severe cases, it may not take place at all.
Why photosynthesis requires water?Photosynthesis requires water as one of its essential inputs, as it is used in the process of creating glucose and oxygen from carbon dioxide and light energy. Therefore, if plants do not receive enough water from the water cycle, photosynthesis can be impacted, and in severe cases, it may not take place at all.
Water is not only a raw material in photosynthesis, but it is also necessary for the regulation of plant cells' internal pressure, which is essential for maintaining their shape and structure. Without enough water, the cells' internal pressure decreases, causing them to shrink and lose their rigidity. This process is known as wilting.
Hence, water is essential for plant growth and photosynthesis, and if plants do not receive enough water from the water cycle, it can lead to wilting, stunted growth, and a reduction in photosynthesis.
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What effect does an increase in carbon dioxide (CO 2 ) have on the concentration of hydrogen ions (H^ + ) in the blood?
Answer:
As the level of carbon dioxide in the blood increases, more H+ is produced and the pH decreases. This increase in carbon dioxide and subsequent decrease in pH reduce the affinity of hemoglobin for oxygen. The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right.
I need help with the stuff highlighted in the blue
Answer:
CO2 + H2O = C6H12O6 + O2
or
6CO2 + 6H2O = C6H12O6 + 6O2 if it need to be balanced
Answer:
Answer is 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2
Explanation:
HELP ME PLEASE WILL GIVE BRAINLY NO BAD ANSWERS
Answer:
7.17
Explanation:
convert 5.50g to moles of salicylic acid. Then use mole ratios and convert the moles of salicylic acid to moles of Asprin(mole ratio is 1:1). Then convert the moles to grams using the molar mass of asprin.
what color does a green objcet appear under red light
Answer:
black??
Explanation:
Please answer correctly !!!!! Will mark Brianliest !!!!!!!!!!!!!!
Answer:
I think Sr I think so maybe
Lichens, a combination of fungi and algae, grow on the surface of rocks. They secrete acids that slowly eat away at the surface of the rock.
Is this an example of chemical or physical weathering?
physical
chemical
Answer:
Chemical
Explanation:
it is a chemical weathering because it is eating away at the rock instead of actively eroding the rock.
Calculate the percent ionization of a 0.381 M solution of hydrocyanic acid.
Answer:
.00402 %
Explanation:
hydrocyanic acid (HCN) is a weak acid with a Ka of 6.17*10^-10 so you need to do a RICE table
initial concentration of HCN is .381 and initial H+ and CN- concentration is 0.
that means the equillibrium concentration of HCN will be (.381-x) and H+ and CN- will be x
put that into the formula for Ka, so it'll be Ka = x^2/(.381-x) and then use quadratic equation to solve. You'll end up getting x = 1.5 * 10^-5.
Then to find percent ionization you solve (concentration of formed ions / initial HCN)
Which will be (1.5 * 10^-5 / .381) * 100 = .00402 % making it a very weak acid <3
When 25.5 grams of a molecular substance is dissolved in 225g benzene, the solution begins to freeze at -5.05C. Calculate the molar mass of this solute (I need to understand the work, and look at the image attached for the key for benzene.
Answer:
here :). hope this helps.
Empirical Formulas are the? A) multiple of the ratio B) simplest ratio of elements C)the mass formulas D) the percent expected to make in a reaction
how many molecules are in 23 moles of oxygen
Answer:
1.385 x 1025 molecules are there in 23 mole of oxygen
What keeps mountains from being even taller than they
already are?
Answer:
Three main processes control mountain height: lateral support of mountains from tectonic forces, which stops mountains from collapsing under their own weight or pushes them up against gravity; climate-controlled erosion; and isostasy, which keeps mountains afloat on the hot and soft mantle material.
Explanation:
What must be known to find an object's average speed?
*direction and time
*distance and time
*displacement and direction
Answer:
distance and time
Explanation:
total distance/ total time
The mass of the sun is about 1.98 x 10^30 kilograms. The mass of the earth is 5.97x 10^24 kilograms. The mass of the sun is how many times greater than the mass of
the earth?
Answer:
Explanation:
The mass of the sun is about 1.98 x 10^30 kilograms. The mass of the earth is 5.97x 10^24 kilograms.
1.98 x 10^30 / 5.97x 10^24 = 331658 times greater
Answer:
Explanation:
The mass of the sun / the mass of the earth
= 1.98 x 10^30 / 5.97x 10^24
= 3.32 x 10^5 times greater
Select the correct answer.
An iron bar at 200°C i placed in thermal contact with an identical iron bar at 120°C in an isolated system. After 30 minutes, both iron bars are at
160°C. the iron bars were placed in thermal contact in an open system instead of an isolated system, how would the results be different?
Assume that the room temperature is 25°C.
O A The temperatures of the iron bars after 30 minutes would be less than 160°C because heat would be lost to the surroundings.
O B. it would take more than 30 minutes for both iron bars reach 160°C because heat would be transferred less efficiently.
O C. The temperatures of both iron bars would increase as they absorb heat from the surroundings.
O D. The temperatures of both iron bars would decrease because pieces of them would be lost to the surroundings.
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Complete and balance the following neutralization reaction, and estimate the
likely pH of the neutralization point. (3 pts)
Ca(OH)2 + HNO3 →
Answer:
we have a base-Ca(OH)2 and an acid - HNO3
→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)
the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .
Explanation:
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Who are the scientists that contributed in arranging of the periodic table?
Lightning is caused by the build-up of and subsequent striking of electrons against the ground. Is a lightning bolt striking the ground an example of potential or kinetic energy?
Answer:
Kinetic
Explanation:
Which type of star has the greatest temperature on the HR diagram? Question 7 options: Red Supergiants Main Sequence White Dwarfs Red Giants
Answer:
Red Super Giants
Explanation:
Beacuse of the of their size, the core temperature is more hotter then White Dwarfs and Red Giants.
Answer:
Red Super Giants
Explanation:
Their core is the hottest.
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explain two ways that bills penguin toy is similar to the water cycle
All the water on the earth is the same water that has been here since
BRAINLISTAll the water on the planet is the identical water that has been here since Penguins preen their feathers continually.
What is the water cycle?
Feathers must be defended in prime condition to provide insulation and waterproofing.
Penguins groom with their bills. A gland around the bottom of the tail secretes oil that the penguin distributes throughout its feathers.
Penguins preen for several minutes in the water by stroking their bodies with their flippers while turning and twisting.
Penguins preen to maintain their feathers in head circumstances and are waterproof. On a well-groomed penguin, moisture rarely touches the skin.
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What is the range of pH values in a basic solution?
a.pH=7
b.pH is greater than 7
c.pH is between 0 and 14
d.pH is less than 7
Answer:
b. ph is greatet than 7
Explanation:
ph=7 neutral
ph=7-14 basicity as you go up increase basicity
ph=0-7 acodity as you go down increasing acidity
How many dm3 of hydrogen are released when 3 g of potassium is reacted with hydroiodic acid?
Answer:
V = 0.0859dm³
Explanation:
Hydroiodic acid, HI, reacts with potassium, K, to produce potassium iodide, KI, and hydrogen, as follows:
2HI + 2K → 2KI + H₂(g)
To solve this question we have to find the moles of hydrogen produced knowing that 2 moles of K produce 1 mole of H₂. With the moles of hydrogen we can find the volume of hydrogen assuming there are STP conditions:
Moles K -Molar mass: 39.0983g/mol-
3g * (1mol / 39.0983g) = 0.0767 moles of K
Moles H₂:
0.0767 moles of K * (1mol H₂ / 2mol K) = 0.03836 moles H₂
Using: PV = nRT; V = nRT / P
Where V is volume in dm³,
n are moles of gas: 0.03836 moles,
R is gas constant = 0.082atm*dm³/molK
T is absolute temperature = 273.15K at STP
and P is pressure = 1atm
The volume of the gas is:
V = 0.03836mol*0.082atm*dm³/molK*273.15K / 1atm
V = 0.0859dm³Does anyone have any idea what this means lol
Answer:
29.42 Litres
Explanation:
The general/ideal gas equation is used to solve this question as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K
According to the information provided in this question;
mass of nitrogen gas (N2) = 25g
Pressure = 0.785 atm
Temperature = 315K
Volume = ?
To calculate the number of moles (n) of N2, we use:
mole = mass/molar mass
Molar mass of N2 = 14(2) = 28g/mol
mole = 25/28
mole = 0.893mol
Using PV = nRT
V = nRT/P
V = (0.893 × 0.0821 × 315) ÷ 0.785
V = 23.09 ÷ 0.785
V = 29.42 Litres
How many moles of gas are in a room with a volume of 85.0 L? A light bulb in the same room at the same temperature and pressure has a volume of 61.0 L and a 9.00 moles of gas.
Answer: A light bulb in the same room at the same temperature.
Explanation: Yw, BYE!!!
Which of the chemicals in the following chemical reaction is the acid?
HCO3- + H20 -->CO3^2- +H30+
A.) HCO3-
B.) co3²-
C.) H30+
D.) H20
A) HCO3- , carbonic acic
PLEASE HELP HELP ME. THIS IS DUE TODAY PLEASE
Answer:
B, C
Explanation:
Hope it helps i read it all
you have a coin with a volume of 10cm3 and a mass of 23g. What is the density of the coin
Answer:
2.3 grams per cubic cm
Explanation:
Density is equal to mass over volume, so
23/10=2.3
1) For the equation in the picture, write down the molecular formula for each of the following species in the reaction:
a) Acid
b) Base
c) Conjugate Acid
d) Conjugate Base
2) In your own words, what is a Bronsted-Lowry Acid?
Answer:
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