David runs a 100-m dash while pushing a stroller with a force of 25N. The work done by David is 2500 Nm.
What is force?Force is a power that changes the motion of the object.
The displacement is 100 m
The force is 25 N
Work done = force x displacement
25 x 100 = 2500 Nm
Thus, the work done by David is 2500 Nm.
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how many liters is 3.0 g of o2 gas
1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.
What is the unbalanced and balanced equation of elephant's toothpaste!? PLEASE HELP!!
Answer:
2 H2O(g) + O2(g)
2 O-1 → O20 + 2 e- 4.
Explanation:
Essentially elephant's toothpaste is just the decomposition of H2O2, hydrogen peroxide. It's catalyzed by KMnO4
Balanced Equation: [tex]2H_2O_2 \ -- > \ 2H_2O \ + \ O_2_[/tex]
Unbalanced Equation: [tex]H_2O_2 \ -- > \ H_2O \ + \ O_2[/tex]
Analyze your results.
a. Calculate the solution concentration for each of the HCl samples. The first one has been done for you.
b. As the concentration of the HCl solution increased, did the speed of the reaction increase or decrease?
Upload your data and responses to the questions in the Analysis and Conclusions section.
WRITER
c. Therefore, as the concentration of a reactant increases, does the rate of the reaction increase or decrease?
d. Do your predictions previous to this investigation agree with your results?
e. Make a general rule about the effects of concentration of reactants on reaction rates.
#b
According to Le C ha.te llors principle of we increase concentration of reactants or products equilibrium shifts.
Yes increases#c
Rate of reaction also increases#e
Stated in b
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8x10^-6 M/s. Which of the following would
explain a lower rate after another 3 seconds?
A) The concentration of reactants increased while the concentration of product decreased
B) The concentration of reactants decreased while the concentration of product increased
C) All concentrations of reactants and products decreased
D) All concentrations of reactants and products increased
Answer: B
Explanation:
One mole of which substance contains a total of 6.02 x 1023 atoms? (I need help please.)
Li
NH3
CO2
02
Answer:
Oxygen
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
Fluorine-21 has a half-life of approximately 5 seconds. what percentage of the original nuclei would remain after 15 seconds
Answer:
1/8th = 12.5%
Explanation:
Three half lives would be 1/2 * 1/2 * 1/2 = 1/8 th of original
Why do elements in the same group on the periodic table have similar
properties?
Answer:
because they possess the same number of electron at their outermost shell
15. The bird flu, also known as influenza A, is caused by a virus. Pneumonia, which can have similar symptoms to
influenza A, is caused by a bacterial infection. Which statement best summarizes the difference between these two
diseases?
O Viruses are living organisms while bacteria are not.
O Viruses are non-living organisms while bacteria are living.
O Bacterial infections are harmless to humans while viruses can be deadly.
Bacterial infections are harmful to humans while viruses can be beneficial.
a given mass of gas occupies 500 cm³ at 25° C calculate the temperature in degree Celsius at which its volume becomes doubled at constant pressure
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
What is Charles's law?Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
V₁/T₁ = V₂/T₂
Given that;
Initial volume of gas V₁ = 500cm³Initial temperature of gas T₁ = 25°CIf final volume is double of initial volume.
Final volume V₂ = 2 × 500cm³ = 1000cm³Final temperature T₂ = ?V₁/T₁ = V₂/T₂
V₁T₂ = V₂T₁
T₂ = V₂T₁ / V₁
T₂ = ( 1000cm³ × 25°C ) / 500cm³
T₂ = 25000m³°C / 500cm³
T₂ = 50°C
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
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Question 3(Multiple Choice Worth 4 points)
(08.04 LC)
Which statement is true about a substance that has a pH value of 14?
O It is a weak base.
O It is a weak acid.
O It is a strong base.
O It is a strong acid.
A substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
What the different pH reading indicates?The pH value 1 to 6 indicates acidic, 7 shows neutral whereas pH from 8 to 14 shows basic nature. pH 1 shows strong acid which becomes weak when it goes to 6 while on the other hand, pH 8 is a weak base which increases when it reaches to 14.
So we can conclude that a substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
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Answer:
C. It is a strong base
Explanation:
pH 1 to 6 is acid (weaker)
pH 7 is neutral
pH 6 to 14 is base (stronger)
27. Write balanced equations that describe the following reactions.
a. the dissociation of perchloric acid in water
b. the dissociation of propanoic acid (CH3CH2CO2H) in
water
c. the dissociation of ammonium ion in water
#a
HClO_4(aq)+H2O(l)—»H3O+(aq)+ClO_4#b
CH3CH2COOH + H2O ==> CH3COO^- +H3O#c
This is reversible reaction
H2O + NH_3 ⇄ OH^- + NH4^+3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
Example Sentence
I am tired today and don't have much energy.
Energy:
____________
Example Sentence
Make sure to turn off the lights when you're done to save energy.
Answer:
Explanation:
3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
whAT IS THE ELEMENTS FOR THE EQUATION OF DENSITY?
Answer:
Hello there! I believe the answer you need is d= M/V. Have a good day,night or miday. Sorry if I'm wrong.
What is the molarity of the resulting solution when 45.0 mL of a 1.90 M H2SO4 solution is added to 95.0 mL of 0.600 M H2SO4
When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.
To answer the question, we need to know what molarity is.
What is molarity of a solution?Molarity is the number of moles per unit volume with volume in liters.
To find the molarity of the resulting solution, we need to find the number of moles in each solution.
Number of moles, n = MV where
M = molarity of solution and V = volumeNumber of moles in first solution
Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.
M' = 1.90 M and V' = 45.0 mL = 0.045 L
So, n' = M'V'
= 1.90 M × 0.045 L
= 0.0855 mol
Number of moles in second solution
Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.
M" = 0.600 M and V" = 95.0 mL = 0.095 L
So, n" = M"V"
= 0.600 M × 0.095 L
= 0.057 mol
Number of moles in resulting solution
The number of moles in the resulting solution is n'" = n' + n"
= 0.0855 mol + 0.057 mol
= 0.1425 mol
Volume of the resulting solution
The volume of the resulting solution is V"' = V' + V"
= 45.0 mL + 95.0 mL
= 150.0 mL
= 0.15 L
The molarity of the resulting solution
The molarity of the resulting solution is M'" = n"'/V"'
= 0.1425 mol/0.15 L
= 0.95 mol/L
= 0.95 M
So, the molarity of the resulting solution is 0.95 M.
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why is vanilla extract brown when vanilla ice cream is white?
please be as detailed as possible in your answer
Answer:
Because vanilla Ice cream contains vastly more milk, sugar, etc. Then vanilla extract. It only takes a very small amount in comparison to adding that flavor.
Explanation:
I hope this helps girl
Why is vanilla ice cream white instead of brown?
It is true that Vanilla beans are brown in color and it is interesting that with this brown color ingredient, Vanilla Ice Cream is still white. Well, the vast majority of vanilla flavoring comes in the form of extract. Vanilla beans are very expensive and pure Vanilla has great flavor. When Ice Cream is made, the Vanilla we put in the Ice Cream is very insignificant quantity when compared to the milk powder, sugar, and cream that goes into the Ice Cream. Due to the whipping and procedure of the making, the brown color of Vanilla is lost amongst the huge quantities of other ingredients and we get milky white yummy Vanilla Ice cream
As the temperature increases to the ice cube's equilibrium stage, the average kinetic energy of the molecules….?
increases
decreases
remains the same
increases and then decreases
Answer:
Increase
Explanation:
if the temperature is increasing it will be slowly melting the ice causing it to turn into a liquid which will make the kinetic energy in the molecules increase.
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
The specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
How to calculate specific heat?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature2520 = 10 × c × (70 - 10)
2520 = 600c
c = 4.2 J/g°C
Therefore, the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
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Answer:
A
Explanation:
4 Identify Give an example of a physical change and an example of a chemical change.
Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
Draw two lewis structures for a compound with the formula c4h10. No atom bears a charge, and all carbon atoms have complete octets. Include all hydrogen atoms.
Answer:
See pictures!
Explanation:
Here is a drawing of butane (C4H10); labeled #1. An isomer of butane will also have the chemical formula C4H10 but is depicted different geometrically. I labeled this one #2.
Hurry please what will scientists do to solve invasive species? How will it problem solve? Will it be successful or effective?
Answer:
scientists could import or encourage breeding of a natural predator of the invasive species. it will be successful although may be a problem over time as the predator may become invasive.
Explanation:
this will greatly lower the amount of the invasive species as they are being consumed by an introduced predator, although you do risk making the predator an invasive species over time.
question 2
metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas.
a. if 24.3 g mg are heated with 12.0 g h20, identify the limiting reactant - magnesium or water (steam)?
Explanation:
[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]
A student is making tea on a cold day. When he tries to put honey in his tea, the honey will not flow out of the bottle. Describe how the student could make the honey flow out of the bottle more easily, and explain why your method would work.
Answer:
Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle
Explanation:
The conjugate base of a strong acid will always . . .
be acidic
be basic
be a spectator
importance of scientific learning
Answer:
scientific literacy provide essential tools for surviving in the news jungle and for responsible citizenship. They also teach us to understand our own actions, to review them critically, and to take care of our rights. This is why science education is important
Explanation:
True or false: in an ionic bond, the difference in electronegativities between the two bonding
atoms is greater than the difference in a covalent bond.
Answer:
its true hope this helped :)
How many moles of H2O are in 35 grams of H2O?
Answer:
1.94 Moles H2O
Explanation:
1 grams Water to mol = 0.05551 mol
so 35 x 0.05551 = 1.9427952271627198, which rounds to 1.94 moles
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A chemist needs 32.0 g of phenol, C6H5OH, for an experiment. How many moles of phenol is this?
Explain how to find the molar mass of the compound.
Explain how many significant figures your answer needs to have.
The numerical answer
A chemist needs 32.0 g of phenol, for an experiment. The number of moles of phenol is 0.340 mol.
What are moles?
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
Calculating the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{32.0}{94.11} = 0.340 moles[/tex]
The molar mass can be calculated by counting the molecules of the elements. Then multiply the molecules of each element with its molar mass and then add the total number, you'll get the molar mass of the compound.
Thus, the number of moles of phenol is 0.340 mol.
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Which type of nucleus decays during a radioactive decay?
a. radioactive
b. light
c. regular
d. heavy
Radioactive decay of a nucleus is common in nuclei that are heavy
What is a radioactive nucleus?A radioactive nucleus is a nucleus that decays by spontaneous disintegration. It is common in Many nuclei that have atomic number above 82.
Hence, radioactive decay of a nucleus is common in nuclei that are heavy and are capable of breaking apart.
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the temperature of gas is raised by 100 deggres to 200 deggres. what happens to the volume of the gas
Answer:
Increases by 100 Pa
Explanation:
According to The Ideal Gas Equation,
the temperature of the gas is directly proportional to the volume of the gas present in itIf the temperature rises from 100 K to 200 K, then the volume will increase by 100 Pa (standard unit of Pressure)What are communication skills??
Answer:
Communication skills are the abilities you use when giving and receiving different kinds of information. Some examples include communicating new ideas, feelings or even an update on your project. Communication skills involve listening, speaking, observing and empathising. It is also helpful to understand the differences in how to communicate through face-to-face interactions, phone conversations and digital communications like email and social media.
Explanation:
Answer:
The definition. Communication skills enable individuals to understand others and to be understood themselves. A variety of aspects are important in the context of these skills, such as listening, speaking, observing and empathy.