How many calories are absorbed in a process that absorbs 0.128 joules?
A. 0.031 cal
B. 0.536 cal
C. 536 cal
D. 0.310 cal
As you move down and to the left on the periodic table metals become a
How many atoms are in 0.500mol of calcium?
Answer:
3.01×10²³ atoms of calcium
Explanation:
number of moles = number of atoms/Avogadro's constant
n = N/NA
N = n×NA = 0.500 mol×6.02×10²³ mol^-1
N = 3.01×10²³ atoms of calcium
PLS HURRY!!!
Suppose that decades of overfishing in the Atlantic Ocean have led to a large decrease in the Atlantic cod population. As a result, there has been a steady decrease in the number of other predator species in the ecosystem. All of the populations in this marine ecosystem are now in danger of decline because of this imbalance.
Which of the following solutions would best help preserve the biodiversity of this ecosystem?
A.
introducing non-native fish species that can repopulate the ecosystem if the native populations continue to decline
B.
only allowing commercial fishing companies to fish for predator fish in this ecosystem for the next several decades
C.
implementing and enforcing laws that limit the number of fish that can be caught annually in this ecosystem
D.
only allowing commercial fishing companies to fish during the species' spawning season when the fish are laying their eggs
Answer:
A
Explanation:
I think it is C because if you read B, c or D you would probably think those would not help the biodiversity of the ecosystem.
Answer:
It's c
Explanation:
C.implementing and enforcing laws that limit the number of fish that can be caught annually in this ecosystem
I just did it soo..
What is a single-displacement reaction?
a type of reaction that occurs when two simple substances interact to form a single new, more complex compound
a type of reaction that occurs when a single substance breaks down into two or more less complex substances
a chemical reaction that occurs when a substance combines with molecular oxygen, releasing light and heat
a chemical reaction that occurs when one element within a compound is exchanged with another element
Answer:
it's the last one.
Explanation:
a compound reaction that occurs when one element within a compound is exchanged with another element.
What is the iupac name of CH3-CH2-CH2-OH?
Answer:
the iupac name of CH3-CH2-CH2-OH Propanol.
when equilibrium has been established explain in terms of reaction rates why the concentration of reactants and products remains the same.
Answer:
The concentration of reactants and products is the same because there is no forward reaction and backward reaction taking place since the equilibrium position is in the mid.
Which type of pressure system is located near Seattle? *
Answer:
Seattle is shielded from extreme weather by the Cascade and Olympic mountain regions to the east and west, respectively. Low pressure systems tend to come from the south while high pressure systems tend to come from the north.
Name the following ketone:
The correct answer is
1,4-dichloro-2-pentanone
The name of the given molecule will be "1,4-dichloro-2-pentanone".
What is molecule?A molecule represents the tiniest unit of a material that keeps its content and properties. It must be made up of two or more atoms that have been joined together by chemical bonds.
What is 1,4-dichloro-2-pentanone?This molecule will be made by carbon, oxygen , hydrogen and oxygen molecule.
It can be seen that given molecule has 5 carbon atom in which 1 and 4 position of carbon atom chlorine atom is present and at 2 carbon oxygen atom is presence. that's why the name of the given molecule will be "1,4-dichloro-2-pentanone".
In this molecule one ketone and two halogen (Cl) groups are present that's why it can be consider as keto halogen compound.
The molecular formula of this compound can be written as [tex]C_{5} H_{10} Cl_{2} O[/tex]. Presence of oxygen molecule indicate that keto group should be present in the given molecule . So the name of the compound should be 1,4-dichloro-2-pentanone
Therefore, the correct answer will be option (C).
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If there are 3 cats but they each die of different diseases one of heart fail, second of Brian tumor and 3rd of experiment gone wrong, which how many cats are left.
Answer:
none
Explanation:
It is given that there are 3 cats.
Each of the cats die with different diseases. One of cats died due to heart failure, the second cats died because of brain tumor and the third cat died due to an experiment gone wrong.
So there are none of the cats left out. All the cats died due to different reasons.
PLEASE HELP
If I put more air in a car tire, which relationship does it show?
a. pressure and volume
b. temperature and volume
c. amount of gas and pressure
Selected: d. temperature and pressure
Answer:
amount of gas and pressure
You have been hired by Acme Fireworks to create a new line of fireworks. You need a 2.5M solution of HCl to make your prototype. To what volume must 250.0 mL of 6.2M HCl be diluted in order to obtain a 2.5M solution?
A. 260ml
B. 620ml
C. 370ml
D. 990ml
Answer:7283
Explanation:
$34748
A student added 3 gms one substance in a beaker and then added 4 gms of another substance. A chemical reaction took place in the uncovered beaker, after the reaction the beaker weighed 5 gms which of the following is the best explanation?
A Some of the mass of the reactants was lost as heat and evaporated into the air.
B. The reaction produce a gas as a product.
C. Some of the reactantants were destroyed as when the chemicals were added.
Answer:
B. The reaction produce a gas as a product.
Explanation:
According to the law of conservation of mass, the total mass of reactants must be equal to the total mass of products because mass is neither created nor destroyed in a chemical reaction.
The total mass of the reactants is 7 grams. The total mass of the products and the beaker is 5 grams. This means that the mass of products is less than the mass of reactants.
The only plausible explanation for this is that the reaction produced a gaseous product which escaped because the system is an open system thereby leading to a lesser measured mass of products since mass can not be created nor destroyed.
what is a major disadvantage of crude oil as an energy resource ?
Answer:
Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.
Explanation:
(PLEASE HELP) 500 mL of a gas is collected at 745 mmHg. What will the volume be at 1.8 atm?
Answer:
272.22 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we're finding the new volume we have
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
First convert 745 mmHg to atm
760 mmHg = 1 atm
745 mmHg = 745/760 = 0.98 atm
We have
[tex]V_2 = \frac{500 \times 0.98}{1.8} \\ = 272.222...[/tex]
We have the final answer as
272.22 mLHope this helps you
Which of the following describes an impact of the specific heat of water on the planet and the life forms that exist on it?
a) places near the sea show high high temp variation
b) inland cities have moderate temperatures throughout the year
c) marine life experiences sudden spikes and drops in temperature
d) sweat requires a lot of thermal energy to be absorbed to evaporate
Answer:
The answer is D, "sweat requires a lot of thermal energy to be absorbed to evaporate."
Explanation:
Like the other person, I just took the test.
An impact of the specific heat of water on the planet and the life forms in it is: D. sweat requires a lot of thermal energy to be absorbed to evaporate.
What is thermal energy?Thermal energy is also referred to as heat and it can be defined as a form of energy that is transferred from one physical object to another, especially due to a difference in temperature.
Generally, a lot of thermal energy is required to be absorbed for sweat to evaporate and this is mainly due to the impact of specific heat of water on the planet and all the life forms that are existing on it.
Read more on thermal energy here: brainly.com/question/12072129
DUE IN 15 MINS! I just wanna clarify
Answer:
well im sorry to say this but good luck >:}
Explanation:
Oxidation, or the loss of electrons, will result in an element becoming _____ positive. This element will show a(n) _____ in oxidation number. Reduction, the gain of electrons, will cause an element to become _____ positive and the element will show a(n) _____ in oxidation number.
Answer:
1)more
2) increase
3)less
4)decrease
Explanation:
Oxidation can be regarded as process involving loss of electrons when a reaction is taking place by an atom or molecule, atom as well as ion. Oxidation do take place as when there is increase in oxidation state of a molecule as well as atom or ion. Reduction which is opposite process takes place as a result of gain in electrons, or when there is decrease in oxidation state of an atom as well as molecule, or ion. Oxidation number gives the the number which is been allocated to elements during a reaction of chemical combination. It gives the count of sharable electrons for an atoms or electron it can gain or loose as chemical bonding is taken place.
It should be noted Oxidation, or the loss of electrons, will result in an element becoming more positive. This element will show an increase in oxidation number. Reduction, the gain of electrons, will cause an element to become less positive and the element will show a decrease in oxidation number.
How long would it take a train to travel 500 miles at 25 mph?
Answer:
2 or 3 hrs
I think
HOPE IT HELPED
1 Which process causes the greatest increase in the distance between particles?
A condensation
B freezing
C melting
D sublimation
The Answer is compensation
6.
What are the mass numbers of; hydrogen, helium
and boron? I
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On the calendar provided below, the full moon is shown happening on the eleventh of the month? What moon would you see around the 25th of the month, shown with the question mark? Question 8 options: A. First Quarter B. New Moon C. Waxing Crescent D. Waning Gibbous
Answer:
The correct answer is - B. New Moon.
Explanation:
The change of moon disc from all black to all light to all dark again is called the lunar cycle. It takes almost 30 days (29.53059 to be precise). The time from all black to all light or all light to all black is almost 15 days. All black moon is termed as the new moon and all light is termed as the full moon.
As given that the full moon is shown happening on the eleventh of the month then what moon would be around 25 which is 14 days later that should be in waxing gibbous phase and almost new moon.
Thus, the correct answer is - B. new moon.
Mg + 2HCl → MgCl2 + H2
How many grams of hydrochloric acid (HCI) is needed to produce 200g of H2?
Answer:
7242.1g
Explanation:
The balanced equation for this reaction is as follows:
Mg + 2HCl → MgCl2 + H2
From the above equation, it can be observed that 2 moles of HCl is needed to produce 1 mole of H2.
Using the formula below, we convert the mass of H2 to moles;
Molar mass of H2 = 2.016g/mol
mole = 200/2.016
mole = 99.21mol of H2
Since 2 moles of HCl is needed to produce 1 mole of H2.
Then 99.21 moles of H2 will be produced by 99.21 × 2 = 198.4mol of HCl
Molar mass of HCl = 1 + 35.5
= 36.5g/mol
Mole = mass/molar mass
Mass = molar mass × mole
Mass = 36.5 × 198.4
Mass = 7242.1g
GUYS, PLEASE HELP ME I'M ON THE LAST QUESTION AND I GET IT WRONG I HAVE TO START OVER. no links
Answer:
its actually experimental this time
Explanation:
sorry bout the last one i just wanna help:(
At STP 101.3 kPa 0 C one mole of Ar gas was collected and was found to occupy a volume of 22.4L What is the value of the gas constant in rounded to the nearest hundredth?
Answer:
8.31 KPa.L/Kmol
Explanation:
From the question given above, the following data were obtained:
Pressure = 101.3 KPa
Temperature (T) = 0 °C = 273 K
Number of mole (n) = 1 mole
Volume = 22.4 L
Gas constant (R) =?
The gas constant can be obtained as follow:
PV = nRT
101.3 × 22.4 = 1 × R × 273
2269.12 = R × 273
Divide both side by 273
R = 2269.12 / 273
R = 8.31 KPa.L/Kmol
Therefore, the value of the gas constant is 8.31 KPa.L/Kmol
18.) CCC Energy and Matter Photovoltaic power from solar panels and biomass
energy are obviously forms of solar energy, coming from sunlight. Explain why
both wind power and hydroelectric power can also be considered to be forms of
solar energy.
Answer:
See Explanation
Explanation:
Renewable energy sources refers to those energy sources that can never be depleted. This means that they can be used severally without getting exhausted. Solar, biomass, wind and hydroelectric power are all renewable energy sources.
Hence, from the perspective described above, we can say that wind is a form of solar energy because wind is formed when the air is heated by the sun.
Hydroelectric power is driven by the water cycle. This water cycle somehow depends on the sun to run efficiently. So, hydroelectric power can also be considered to be a form of solar energy.
To test paint quality, scientists designed an experiment where the paint was exposed to temperatures ranging from 260 degrees Celsius to 650 degrees Celsius. After each trial, the paint quality was determined by checking for peeling and cracking. The same paint and materials were used in each trial.
Independent Variable-
dependent variable-
constant rate(s)
Answer:
The independent variable is the temperature to which the paint and materials are exposed
The dependent variable is the presence of peeling and cracking of the paint
The constant rates are the paint and material used for each trial
Explanation:
The treatment the to which the paint is subjected = Temperatures from 260 °C to 650 °C
The method of determining the paint quality = By peeling and cracking
The types of paint and materials used = The same paint and material
The independent variable is the variable suspected as the cause of the effect being studied. It is the variable introduced as a treatment
In the question, given that the paint is subjected to different temperatures from between 260°C to 650 °C, the temperature changes introduced is the independent variable
Therefore;
The independent variable = The temperature to which the paint and materials are exposed to
The dependent variable is the effect variable. It is the variable of the property being investigated and it is also the variable that is measured in the investigation
In the question, given that the after heating the paint and material, the scientist check for peeling and cracking, the dependent variable is the occurrence of cracking and peeling at a given temperature
Therefore;
The dependent variable = The presence of peeling and cracking of the paint
The constant rate(s) are variables which are kept constant during the investigation, under the different treatments
The constant rate(s) in the tests are the paint and material, which were kept the same for each trial to reduce the effect of underlying factors that may impact on the result and obscure the relationship between the dependent and independent variables
Therefore;
The constant rate are the paint and material used for each trial
Which of these describes a similarity between nuclear energy and fossil fuel?
A. Both release products with short half-lives.
B. Both fuels have the same energy density.
C. As both fuels undergo reactions, heat is released, which is used to
do work.
D. The cost of storing both fuels is expensive.
SUBMIT
The similarity between nuclear energy and fossil fuel is "as both fuels undergo reactions, heat is released, which is used to do work."
What is nuclear energy?Nuclear energy is the type of power produced when a nuclear reaction releases energy. Nuclear energy was exemplified mostly by the electricity generated by just a nuclear reactor, which is Japan's principal source of energy.
What is fossil fuel?Fossil fuel is just a hydrocarbon-containing component that occurs naturally in the earth's crust and is collected and being used as a fuel. The most popular fossil fuels are coal, crude oil, and natural gas.
Therefore, similarity between nuclear energy and fossil fuel is both fuels undergo reactions, heat is released, which is used to do work.
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Given the formula of a compound:
(1) aldehyde
(2) alkene
(3) alkyne
(4) alcohol
Answer:
Number 3 alkyne is the answer
Explanation:
Answer: The answer is Alkyne.
Given the information in the velocity vs. time graph,
what is the displacement of the object after 1 second?
After 3 seconds?
After 5 seconds?
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