Answer:
its d
Explanation:
The Millikan oil-drop experiment, which was the first experiment to measure the charge of the electron, compared the electrical force on a small charged oil drop with the force exerted on this drop by gravity.
a. True
b. False
Answer:
True
Explanation:
The oil drop experiment was carried out by Robert Millikan and Harvey Fletcher in 1909 to determine the charge of an electron. By balancing downward gravitation force with upward drag and electric force, they suspended small charged droplets of oil between two metal electrodes.
The charge over an oil droplet was often an integral value of e, was determined by changing the intensity of the electric field.
So, the given statement is true
A 2.5 L container is filled with propane. The ambient temperature is 25°C and the
pressure in the container is about 3 atmospheres. If the temperature in the car
reaches 55°C (about 130°F), what will be the pressure in the container?
(please show work)
Answer:
3.3atm is the new pressure of the container
Explanation:
In the car, the temperature of the container increases from 25°C =298K to 55°C = 328K. To solve this question we must use the Boyle's law that state that the pressure of a gas is directly proportional to its absolute temperature under constant volume. The equation is:
P1T2 = P2T1
Where P is pressure and T absolute temperature of 1, initial state of the gas and 2, final state.
Replacing:
P1 = 3atm
T2 = 328K
P2 = ?
T1 = 298K
3atm*328K = P2*298K
P2 = 3.3atm is the new pressure of the container
Answer:
3.3 atm
Explanation:
First we convert 25 °C and 55 °C to K:
25 °C + 273.16 = 298.16 K55 °C + 273.16 = 328.16 KWe can solve this problem by using Gay Lussac's law, which states that at constant volume:
T₁P₂=T₂P₁Where in this case:
T₁ = 298.16 KP₂ = ?T₂ = 328.16 KP₁ = 3 atmWe input the data:
298.16 K * P₂ = 328.16 K * 3 atmAnd solve for P₂:
P₂ = 3.3 atmhow does a heavy growth of algae decrease the concentration of oxygen in a lake?
Answer:
Explanation:
iuhyesfdxgrygtvd ctrfdrdt6r76_jjdvrud83447+je8867vbde turn left then go right back then stop done
Nothing. Finished my AP chem test n wanna give some points out
Answer:
Nice
Explanation:
Answer:
thanks girl
Explanation:
a point of reference is anything that seems steady that is used compare the position of an object
TRUE OR FALSE?
Answer:
True
Explanation:
hope it'll help!!
That statement would be true
The half-life of carbon-14 is 5715 years. How long would it take for 100 grams to decay to
12.5 grams
We are given:
half-life of carbon = 5715 years
Initial mass = 100 grams
Final mass = 12.5 grams
Finding the time taken:
Number of half-lives:
We know that in the relation:
[tex]\frac{Final\_mass}{Initial\_mass} = \frac{1}{2^{n}}[/tex], n is the number of half-lives taken
replacing the given values:
12.5 / 100 = 1/2ⁿ
1/8 = 1/2ⁿ
2ⁿ = 8
2ⁿ = 2³
n = 3
Hence, it took 3 half-lives to reduce the mass to 12.5 grams
Number of years:
Time taken = 3 half-lives
we know that one half-life is 5715 years, replacing that value:
Time taken = 3*(5715) years
Time taken = 17145 years
Therefore, after 17145 years, a 100 gram sample of carbon will decay and only 12.5 grams will remain
PLEASE HELP!!
Please
For a solution with OH- concentration of 5.6 x 10-7 M, calculate the pH AND classify the solution of acidic, neutral, or basic.
a. 7.7 basic
b. -6025 acidic
c. 6.25 acidic
d. 0 basic
Answer:
la respuesta es la letra: a
The hydroxide of the solution can give the pOH of the solution used to determine the pH of the solution. The solution has a pH of 7.7 and is basic. Thus, option a is correct.
What is pH?The hydrogen potential of the solution is given by the concentration of the hydrogen or the hydroxide concentration dissolved in the solution.
The pH or the pOH of the solution can be used to determine the acidic and basic nature of the solution based on the range in which it lies.
If the pH of the solution lies below 7 then they are said to be acidic, whereas above 7 are alkaline in nature.
Given,
[OH⁻] =5.6 x 10⁻⁷ M
First, pOH is calculated as,
pOH = -log [OH⁻]
pOH = - log (5.6 x 10⁻⁷ M)
pOH = 6.252
Now, pH from pOH is calculated as:
pH = 14 - pOH
pH = 14 - 6.252
pH = 7.748
Therefore, option a. the pH of the solution is 7.7 and is basic.
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The bond that holds together positive and negative ions is
called a(n) bond.
Answer:
Ionic bond
Explanation:
An ionic bond holds positive and negative ions together.
Two motions of a planet are rotation and revolution. Which of the following best models rotation of a planet?
a plane circling an airport
spinning top
bee flying around a flower
car traveling on a race track
Answer:
spinning top is the answer
Calculate the pH if the [OH-] concentration is 5.9x10-1 M.
Plants help prevent erosion by?
A.) plants to not help prevent erosion.
B.) plowing across the slope to create slopes.
C.) anchoring soil in place so is not blown or washed away.
D.) allowing soil to be blown or washed away.
You can change a subscript in an equation, but you cannot change the
coefficient.
O True
O False
Answer:
false
because you can't change a subscript ,
but you can change the coefficient.
Separation of mixtures and purification of chemical substances
Answer:
I don't understand what to do with this
James decided to do an experiment with a can of soda. He opened a 340 g can of soda and left it open for a day. The next day, he
measured the soda can again and found it was 332 g. Which statement below best explains why the masses were different?
A. The can was open and gases were released.
B. The can was a unopen and gases were released.
C. A mistake was made and the experiment should be conducted again because the Law of Conservation of Mass was violated.
D. A mistake was made in measuring the mass of the can.
Answer:
A - The can was open and gases were released.
Sometimes Combination reaction takes place sometimes decomposition and sometime replacement.. Can someone say me the conditions required for it?
Do not tell the defination of decomposition, replacement and of combination.. During reaction sometimes gas is formed sometimes not..
Can Some one explain it in a well manner.. Do not give Undesirable answer:
Whenever any substance goes under chemical change so any of the reaction will happen either both or multiple compounds will combine to produce combination reaction either one compound will decompose itself into 2 or more compounds or elements and last one is replacement reaction the either reaction is not even going to combination nor decomposition, So when a reaction like that happens it must replacement reaction.
Now the question is what's the condition required for it, so basically a chemical reaction when takes place it depends upon several factor on the basis of which we conclude products. The factors are Temperature,catalyst,reagents, either what is the mechanism of reaction, stability of reactants and stability of products and alot more.
During reaction sometimes gas forms and sometimes not yea and well that also depends on the chemical reactivity and stability of product sometimes product found itself most stable releasing the gas evolving so it's been done itself and sometimes we add catalyst and adjust the reaction to extract that gas and get desirable product manually.
I wrote all i know if sorry if this is not what you're looking for :(
The following statements are either true or false. Read each sentences carefully, then write TRUE faLSE
1. A force cannot be seen
2. A force cannot be felt.
3. A force always causes things to move
When an object is at rest, no gravitational force is acting on it
5 Gravitational force pulls all things downward
5. Mass and weight are the same quantities
7. All objects on Earth have weight
8 Some forces are useful to people
9. Gravity makes it easy for a person to ride a bicycle up
10. Weight is measured in grams (R) and kilograms
1) T
2) F
3) F
4) F
5) T
6) F
7) T
8) T
9) F
10) ...T... grams are usually in lowercase g
Cells grouped together to make a specific part of the body of a plant or animal are called: an organism photosynthesis a tissue
Answer:
THE CORRECT ANWER IS ;Cells make up tissues, tissues make up organs, and organs make up organ ... All the systems of the body work together to keep an organism up and running. ... out a particular function, and groups of organs with related functions make up the ... Connective tissue supports and, as the name suggests, connects other tissues.
Explanation:
Answer: The correct answer to this question is "a tissue.
Explanation: "Tissue is a term used to describe a group of cells that have similar structure and function and work together to carry out a specific function in the body of a plant or animal.For example, muscle tissue is made up of muscle cells that work together to help the body move, while nervous tissue is made up of nerve cells that transmit signals throughout the body.An organism is a living entity that can carry out all of the basic life processes, while photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce food in the form of glucose.
What is voltage? A. The pressure that pushes electrons to the anode; it is derived from the negative charge of electrons at the cathode. B. None of these C. The speed of the electrons flowing to the anode; it is determined by the type of metal the electrodes are made of. D. The pressure that pushes electrons to the cathode; it is derived from the negative charge of electrons at the anode.
Answer:
D
Explanation:
I think it's D but not 100% sure
The pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode. Hence, option B is correct.
What is an electrolytic cell?An electrolytic cell is a type of electrochemical cell that undergoes non-spontaneous reactions by deriving the energy in the form of voltage from external sources.
A voltaic cell is a cell in which chemical reactions are used to produce electrical energy in form of current.
Such a cell is made up of two electrodes and their electrolytes. The electrodes are connected via a salt bridge. The salt bridge allows electrons to move between the electrodes.
In a voltaic cell, an oxidation reaction occurs in the anode. During oxidation, electrons are produced. Therefore, the Na electrode in the anode will lose an electron spontaneously. At the cathode, reduction occurs. The Iron electrode here will gain the electron produced by the oxidation reaction at the anode. The salt bridge moves the electrons from the anode to the cathode.
Hence, the pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode.
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What is the empirical formula for the compound H4O2?
Answer:
Explanation:
Dear student, there is no sufficient information to calculate the empirical formula but we will explain what Empirical Formula is all about.
An empirical formula is made up of symbols that denote the elements in a complex, such as H for hydrogen and O for oxygen, as well as subscripts that indicate the number of atoms from each constituent element.
The empirical formula is the atoms in a complex with the lowest whole number ratio. The precise number of atoms in a single molecule is not necessarily shown.
How can people REDUCE the amount of trash being put into landfills?
A recycle paper, glass, plastic and metal
B reuse shopping bags and food containers
compost biodegradable materials
D
all of the above
You have used 310 L of distilled water for a dialysis patient. How many gallons of water is that?
Answer:
82 gallons
Explanation:
There are 3.785 liters in one gallon. In order to get the amount of gallons, divide the amount of liters by 3.785.
310 L ÷ 3.785 L/gal = 81.89 gallons ≈ 82 gallons
A closed tank contains pure nitrogen gas at a pressure of 855
mmHg and a temperature of 26.3 °C. What would the pressure be
if the tank were heated to 1253 °C? (pay attention to units)
Answer:
If the tank were heated to 1253ºC, the pressure of the tank would be 40,734.41 mmHg.
Explanation:
Given that a closed tank contains pure nitrogen gas at a pressure of 855 mmHg and a temperature of 26.3ºC, to determine what the pressure would be if the tank were heated to 1253 ° C the following calculation must be performed:
26.3 = 855
1.253 = X
(1,253 x 855) / 26.3 = X
1,071,315 / 26.3 = X
40,734.41 = X
Therefore, if the tank were heated to 1253ºC, the pressure of the tank would be 40,734.41 mmHg.
Most energy resources used by humans are nonrenewable. Which of the following is NOT a nonrenewable energy resource?
A coal
B natural gas
C oil
D wind
Answer:D wind
Explanation:
Most energy resources used by humans are nonrenewable. Wind is not a nonrenewable energy resource. Therefore, option D is correct.
What are nonrenewable energy resource ?Energy derived from fossil fuels including coal, crude oil, natural gas, and uranium is referred to as non-renewable energy. Non-renewable energy requires human intervention to make it appropriate for use, in contrast to renewable energy.
Fossil fuels made of carbon are one instance. With the use of heat and pressure, the original biological substance transforms into a fuel like gas or oil.
A renewable energy source is wind power. Water does not pollute, it cannot run out, and it lessens the need for fossil fuels, which are where greenhouse gases that contribute to global warming are produced.
Thus, option D is correct.
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starting with calcium chloride describe how one can prepare calcium carbonate
Le Châtelier’s principle is applied in the bottling of carbonated soft drinks. You are probably familiar with the “hissing” or “popping” sound of opening of either an aluminum soda can or plastic bottle. This occurs by adding carbon dioxide to water to produce carbonic acid in a reversible reaction, which is shown below: H2O(l) + CO2(g) <-------------------> H2CO3(aq) As you may have known, these beverages are bottled under increased pressure, placing stress on the equilibrium. Following Le Châtelier’s principle, the system shifts to the right to reduce the stress, in response to the increase in pressure. When the bottle or can is opened, the pressure is reduced. This reaction favors the reactants, thus shifting the system to the left, and CO2 gas forms and comes out of the solution. Question # 8 :You open a can of Coca-Cola and you pour it into a glass with ice. You notice that the soda is very fizzy and quite effervescent. What do you think is responsible for this? Group of answer choices A. H2O formation under pressure. D. Release of H2O as a result of opening the can. B. H2CO3 formation under pressure. C. Release of CO2 as a result of opening the can.
Answer:
C. Release CO2 due to can opening
Explanation:
Le Châtelier’s principle states that when a reaction is at equillibrium and it is disturbed it will respond to return to equilibrium.
SO
H2O(l) + CO2(g) <-------------------> H2CO3(aq)
When you open a bottle of coke it is under pressure and not at equillibrium so it reacts by releasing the gas to reach equilibrium it can be seen in the equation above just that this is for club soda not coke, the idea applies though
Which among the following is NOT TRUE regarding solutions?
A.
a solution is a homogeneous mixture of two or more components
B.
in a liquid solution the solution particles can be ions, atoms or molecules and never settle on standing
C.
the solution particle size is much smaller than colloidal particle.
D.
solution particles can be separated by filtration.
E.
air is a gaseous solution of gases, chiefly oxygen and nitrogen.
Answer:
The answer is D.
Explanation:
I know because I am currently doing this topic in Chemistry as well. I hope it was enough.
How many atoms of oxygen (o)are present 2naOH+H2SO4 2H2O+Na2SO4
Answer:
10
Explanation:
Which of the following descriptions represents the community level of organization?
A) A single individual rabbit, of a certain species, living in a forest
B) A group of rabbits, all of the same species, living in a forest
C) All of the rabbits in a forest, as well as their predators and food plantsAll of the animals, plants, and non-living elements in a forest
D) All of the animals, plants, and non-living elements in a forest
Answer: C) All of the rabbits in a forest, as well as their predators and food plants
Explanation:
The community refers to all living things in a certain area including plants and animals. If the given area is a forest therefore, the rabbit being a living thing, as well as its predators and the plants that it relies on will be considered the community.
This is not unlike a human community where everyone in a given area is considered to be part of the community.
Answer:
C
Explanation:
I got this question on an edusmart.
In an acid-base titration, a student uses 25.62 mL of 0.100 M HCl to reach the endpoint. How many moles of acid is this?
A)2.56 x 10-1 ml HCl
B)2.56 x 10-3 mol HCl
C)2.56 x 10-2 mol HCl
Answer:
Number of mole in HCL = 2.56 x 10⁻³ mol HCL
Explanation:
Given:
Volume of HCL = 25.62 ml
Molarity of HCL = 0.1 M
Find;
Number of mole in HCL
Computation:
Volume of HCL = 25.62 ml
Volume of HCL (in liter) = 25.62 / 1000
Volume of HCL (in liter) = 0.02562 L
Number of mole = Molarity x volume in liter
Number of mole in HCL = Volume of HCL (in liter) x Molarity of HCL
Number of mole in HCL = 0.02562 x 0.1
Number of mole in HCL = 0.002562
Number of mole in HCL = 2.56 x 10⁻³ mol HCL