Answer: 4.5
Explanation:
To measure temperature scientists used?
In your own words, describe how a hurricane forms. (5 points)
What must occur in order for a gas-discharge lamp to produce light?
Describe how molarity can be used in stoichiometry calculations
Answer:
The stoichiometric coefficients in your balanced chemical equation can represent molecules or moles or molarity.
When you balance an equation, you can use the coefficients to determine the quantity of either products or reactants. If the reaction occurs in water, then you can either do the conversion from reactants to products using moles or molarity.
Explanation:
For example, if you have a 1.5M solution of H2SO4, then the concentration of SO4-2 in solution can be determined by the balanced dissociation equation H2SO4 = 2H+ + SO4-2.
1.5M H2SO4(1M SO4-2/1M H2SO4) = 1.5 M SO4-2
Final answer:
Molarity is a key conversion factor in stoichiometry that relates the amount of a solute in moles to the volume of solution, facilitating calculations involving solution concentrations and chemical reactions.
Explanation:
Molarity can be used in stoichiometry calculations to determine quantities in chemical reactions. When dealing with stoichiometry problems involving solutions, molarity serves as a direct conversion factor because it is based on the mole unit. For instance, consider the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH):
HCl(aq) + NaOH(s) → H₂O(l) + NaCl(aq)
Convert the mass of NaOH to moles using its molar mass.Use the balanced chemical equation to find the molar ratio between NaOH and HCl.Convert the moles of NaOH to moles of HCl using this ratio.Finally, use the molarity of the HCl solution (moles per liter) to find the volume of HCl needed to react with the given amount of NaOH.To find out how many liters of aqueous HCl will react with a given mass of NaOH, we perform the following steps:
Note that the molarity acts as a bridge between the amount of solute (HCl) and the volume of the solution.
What color on the pH paper indicates that an acid has formed?
Answer:
red
Blue litmus paper turns red under acidic condition
Explanation:
Answer: Acidic Ph Levels: Lime green, yellow, orangle, and red
Explanation:
Alkaine Ph Levels: Purple, blue, and light green.
Neutral Ph Level: A bright green.
Acidic Ph Levels: Lime green, yellow, orangle, and red
Therefore, once the Ph paper indicates if the color is lime green, yellow, orangle, or red then that means it's acidic.
I hope this helps!
A sample of gas starts at 1.00 atm, 0.00 degrees Celsius, and 30.0 mL. What is the volume if the temperature increases to 27.0 degrees Celsius and the pressure increases to 2 atm?
Answer:
16.48mL
Explanation:
The following data were obtained from the question:
Initial pressure (P1) = 1 atm
Initial temperature (T1) = 0°C = 0°C + 273 = 273K
Initial volume (V1) = 30mL
Final temperature (T2) = 27°C = 27°C + 273 = 300K
Final pressure (P2) = 2atm
Final volume (V2) =..?
Applying the general gas equation, the final volume of the gas can be obtained as follow:
P1V1/T1 = P2V2/T2
1 x 30/273 = 2 x V2/300
Cross multiply to express in linear form
273 x 2 x V2 = 30 x 300
Divide both side by 273 x 2
V2 = (30 x 300)/(273 x 2)
V2 = 16.48mL
Therefore, the new volume of the gas is 16.48mL
The volume of a sample of gas that starts at 1.00 atm, 0.00 degrees celsius, and 30.0 mL is 16.48mL. Details about volume can be found below..
How to calculate volume?The volume of an ideal gas can be calculated by using the following formula:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressureP2 = final pressureT1 = initial temperatureV1 = initial volumeV2 = final volumeT2 = final temperature1 × 30/273 = 2 × V2/300
0.109 = 2V2/300
32.97 = 2V2
V2 = 16.48mL
Therefore, the volume of a sample of gas that starts at 1.00 atm, 0.00 degrees celsius, and 30.0 mL is 16.48mL.
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An electric current is flowing through the cord below.
What will happen to this current if a magnet is brought near the cord?
A.
It will exert a force on the electric current.
B.
The resistance of the wire will decrease.
C.
The electric current will stop flowing.
D.
It will exert a force on the voltage.
Answer:
A
Explanation:
Answer:
es la A
Explanation:
Think about the systems around you for example you’re reading this text on a computer system write definition for the word system
Answer:
A system is a group of related parts that work together as a whole.
Explanation:
edmentum.
A system is a set of interacting elements regarded as a distinctive entity for the purpose of study or observation. It can be physical like planets in a solar system, abstract like the systems operating in a computer, or organic like our nervous system.
Explanation:A system can be defined as a set of elements that interact with each other and can be considered as a single entity, often for the purpose of study or analysis. This grouping can be physical, such as planets in a solar system, or conceptual, like the motor and visual systems in the human body. Systems, whether isolated, closed, or open, abide by certain laws, including conservation laws. Isolated and closed systems have minimal interactions with their environment, while open systems can exchange energy and/or matter with their surroundings.
Examples of systems can be seen everywhere, from how your computer operates as a system, to natural systems such as your nervous system processing sensory information and controlling your body's functions.
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Consider the balanced equation below.
N2H4 + 2H2O2 → N2 + 4H2O
What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water?
1:2 and 1:4
1:3 and 1:4
1:2 and 3:5
1:3 and 3:5
Answer:
A.)
Explanation:
From the balanced equation, it is clear that the mole ratio of the hydrazine to hydrogen peroxide is 1 :2 and that of hydrazine to water is
1 :4.
What is mole ratio ?The mole ratio is the ratio between the number of moles of a reactant to the number of moles of another reactant.
The balanced chemical equation for the reaction is:
N2H4 + 2H2O2 → N2 + 4H2O
From the equation, the mole ratio of hydrazine (N2H4) to hydrogen peroxide (H2O2) is 1:2, which means that for every one mole of hydrazine used, two moles of hydrogen peroxide are used.
Similarly, the mole ratio of hydrazine (N2H4) to water (H2O) is 1:4, which means that for every one mole of hydrazine used, four moles of water are produced.
Therefore, the correct option is 1:2 and 1:4.
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For a social experiment I have to take peoples guesses so PLEASE ANSWER
Someone polled 30,000 Floridians to see what their biggest fear is. Figure out the most common
A.Tourist Drivers
B.Palmetto Bugs
C.Snakes
D.Fire Ants
E.Sinkholes
F.Sharks
G.Broken A/C
H.Alligators
I.Hurricanes
Answer:
I. hurricanes
Explanation:
Answer:
C
Explanation:
Reptiles generally pose some sort of natural bewilderment to most people.
Molar mass c3h8
Total molar mass for carbon atoms
Total molar mass for hydrogen atoms
Carbon percent composition
Hydrogen percent composition
Answer:
1. 44.11 g
2. 36.03 g
3. 8.08 g
4. 81.7%
5. 18.3%
Explanation:
1. 12.01+12.01+12.01+1.01+1.01+1.01+1.01+1.01+1.01+1.01+1.01=44.11
2. 12.01×3= 36.03
3. 1.01×8= 8.08
4.(36.03/44.11)×100= 81.7%
5. (8.08/44.11)×100= 18.3%
The molar mass of C3H8 is 44.094 g/mol. The carbon percent composition is 81.72% and the hydrogen percent composition is 18.28%.
Explanation:The molar mass of C3H8 (propane) can be calculated by adding up the atomic masses of the atoms in the molecule. Carbon has a molar mass of 12.01 g/mol, and there are 3 carbon atoms in C3H8, so the total molar mass for carbon atoms is 12.01 g/mol x 3 = 36.03 g/mol. Hydrogen has a molar mass of 1.008 g/mol, and there are 8 hydrogen atoms in C3H8, so the total molar mass for hydrogen atoms is 1.008 g/mol x 8 = 8.064 g/mol.
The percent composition can be calculated by dividing the molar mass for each element by the total molar mass of C3H8. The carbon percent composition is (36.03 g/mol / 44.094 g/mol) x 100% = 81.72%. The hydrogen percent composition is (8.064 g/mol / 44.094 g/mol) x 100% = 18.28%.
Some plant seeds are adapted to sprout with a limited amount of water. For what environmental change are these seeds most likely adapted? earthquake tsunami drought global warming
Answer:
drought
Explanation:
In an ecosystem, some plant seeds are adapted to sprout with a limited amount of water. They are adapted to drought.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Determine the empirical formula of a compound that is 39.99% carbon, 53.28% Oxygen and 6.73% Hydrogen
Answer:
CH2O
Explanation:
Pretend you have a 100 gram sample.
39.99 g C * (1 mol/12.01 g) = 3.33 moles C
53.28 g O * (1 mol/16 g) = 3.33 moles O
6.73 g H * (1 mol/ 1.008 g) = 6.676 moles H
You can see from this data that there are double the number of moles of H compared to the moles of C and O.
To find the empirical formula, you divide all the moles by the least number of moles. In this case, the least number of moles is 3.33. So for carbon and oxygen, divide 3.33 by 3.33... this equals 1. For H, divide 6.676 by 3.33... this is about equal to 2. Therefore, the empirical formula is CH2O. :)
Hope this was helpful!
Answer: [tex]COH_2[/tex]
Explanation:
39.99% C
53.28% O
6.73% H
First step:
Change % to g
39.99g C
53.28g O
6.73g H
Second step:
Calculate the number of g/mol using atomic mass.
[tex]39.99gC(\frac{1mol}{12g} )=3.332mol[/tex]
[tex]53.28gO(\frac{1mol}{16g})=3.330mol[/tex]
[tex]6.73gH(\frac{1mol}{1g} )=6.73mol[/tex]
Third step:
Determine the smallest number of moles and divide each compound by it. When you get the result, simply put the whole number, not decimals.
[tex]C=\frac{3.332mol}{3.330mol}=1[/tex]
[tex]O=\frac{3.330mol}{3.330mol} =1[/tex]
[tex]H=\frac{6.73mol}{3.330mol}=2[/tex]
Fourth step:
Rewrite those number under the compounds.
This empirical formula should be: [tex]COH_2[/tex]
Ice melting is not a chemical change because __________.
A) a new reactant is formed
B) a new substance is not formed
C) a precipitate is no present
D) there is increased activation energy
Answer:
B.) A new substance is not formed
Explanation:
hope this helps
Ice melting is not a chemical change because a new substance is not formed.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Is it small intestine or Stomach or Rectum or Bladder
Answer: C. Rectum
Explanation:
Using general tendencies and the chart given in the introduction, predict the most likely mode of decay of each of the following radioactive isotopes.
Drag the appropriate items to their respective bins.
Note: Based on the valley of stability, the following processes generally tend to produce more stable neutron-to-proton (n/p) ratios:
Nuclei with Z≥84 tend to undergo α emission.
Nuclei with high n/p ratios undergo β ( 0−1e) emission.
Heavy nuclei with low n/p ratios are more likely to undergo electron ( 0−1e) capture.
Light nuclei with low n/p ratios are more likely to undergo positron (01e) emission.
The classification "high" or "low" n/p ratio can be determined by finding the coordinates on the graph that correspond to the number of protons (x or horizontal value) and neutrons (y or vertical value) in a given isotope. Then, observe whether this set of coordinates is above, within, or below the stability valley.
My Effort to Solve it myself:
K-47, Hg-190, Th-232, Na-20, I-137
# of.... p n order of greatest atomic mass
K: 19 28 4
Hg: 80 110 2
Th: 90 142 1
Na: 11 9 5
I: 53 84 3
Answer:
K-47 undergoes beta decay
Hg-190 undergoes electron capture or alpha decay
Th-232 undergoes alpha decay
Na-20 undergoes positron emission
I-137 undergoes beta decay
Explanation:
Stability of a nucleus is decided by the neutron /proton (n/p) ratio. For lower elements of atomic number 1-20, n/p=1. Elements with higher atomic numbers tend to have a slight excess of neutrons to reduce the repulsive forces between the protons.
Beta emission decreases the n/p ratio, positron emission increases the n/p ratio, electron capture increases the n/p ratio and alpha decay increases the n/p ratio.
Note that a nucleus may undergo several decay processes before stable nucleus (nuclei) is/are formed.
The decay mode of radioactive isotopes is primarily determined by the atomic number (Z) and the neutron-proton (n/p) ratio. For example, K-47 and Hg-190, with high n/p ratios, would decay through β emission. Th-232, having Z≥84 and a high n/p ratio would undergo α emission. Na-20, being a light nucleus with a low n/p ratio would do positron emission, and I-137 with high n/p ratio would do β emission.
Explanation:Based on our understanding of nuclear stability and decay, radioactive isotopes decay in a way that brings them closer to a state of stability. They do this by adjusting their neutron to proton ratios (n/p) through various forms of decay. The mode of decay depends largely on the Z number (atomic number) and the n/p ratio.
K-47 (19 protons, 28 neutrons) has a high n/p ratio, thus it will likely undergo β ( 0−1e) emission.Hg-190 (80 protons, 110 neutrons) also has a high n/p ratio and is likely to decay through β ( 0−1e) emission. Th-232 (90 protons, 142 neutrons), with Z≥84 and a high n/p ratio, is most likely to undergo α emission. Na-20 (11 protons, 9 neutrons) is a light nuclei with a low n/p ratio, so it will most likely undergo positron (01e) emission. I-137 (53 protons, 84 neutrons) has a relatively high n/p ratio and would therefore most likely undergo β ( 0−1e) emission.Learn more about Radioactive Decay here:
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A healthy breakfast supplies 230.000 calories how many joules is that same breakfast? 4.18
Joules i calone
Since 4.184 Joules equals one calorie, simply we need to make a cross multiply equation.
4.184J/1cal=x J/230000cal
Then we can multiply the crosses and set them equal to each other. 4.184(230000)=1x
962320=x
The healthy breakfast supplies 962320 joules worth of food.
Pitchblende is ore of _____.
plutonium
curium
uranium
radium
Answer:
Uranium
Explanation:
Answer:
Uranium
Explanation:
How can carbon dioxide be considered a pollutant when it is a natural component of air?
a Carbon dioxide is considered a pollutant even though it is a natural component of air, because it is
harmful to all living organisms
b Carbon dioxide is considered a pollutant when larger concentrations than normal are present in the
air as a result of human activity
Carbon dioxide is considered a pollutant, because it forms harmful chemicals when mixed with
other pollutants in the air
d. Carbon dioxide cannot be considered a pollutant under any circumstances
Please select the best answer from the choices provided
OA
ОВ
OC
OD
ASAP PLEASE
What objects do magnets stick to?
Answer:magnets, iron, cobalt, nickel, steel (because it is mostly iron), manganese, gadolinium and lodestone.
Explanation:
Hope I helped
(PLEASE HELP IMMEDIATELY)How are total
lunar eclipses and partial
lunar eclipses similar?
Answer:
Explanation:
They both have the same effect just one is whole and the other is half
If the reactants have a potential energy of 10.2 kJ/mol and the products have a potential energy of 15.7 kJ/mol, what is ΔH?
Answer:
your answer
Explanation:
The mass of the electron is
about equal to the neutron.
almost the same as the proton.
very small compared to the proton.
very large compared to the neutron.
light
2:21
Tools
why are viruses (specifically) so dangerous?
Answer:
Over 700,000 lives are taken by the AIDs virus every year. Hepatitis C claims the lives of over 200,000 people each year and haemorrhagic fevers caused by viruses such as Ebola have resulted in over 20,000 deaths.
Explanation:
What is Mitosis (no plagiarism)
a sort of cell division that outcomes in two girl cells each having indistinguishable number and sort of chromosomes from the parent core, average of conventional tissue development.
Answer:
Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
Mitosis is also the basis for healing wounds and fighting off invading pathogens that cause sickness. Certain organisms lose millions of cells per day as part of their normal function. Mitosis allows old cells to be replaced by new ones, ensuring an army of fully functioning cells.
(Hope this helps) Sky
A helium filled balloon has a volume of 2.48L and a pressure of 150kpa the volume of the balloon increases to 2.98L what is the new pressure of the helium gas
Answer:
THE NEW PRESSURE OF THE HELIUM GAS IS 124kPa AFTER THE VOLUME WAS INCREASED FROM 2.48 L TO 2.98 L
Explanation:
Using Boyle's law which states that at constant temperature, the pressure of a given gas is inversely proportional to the volume occupied by the gas.
Mathematically,
P1 V1 = P2 V2
P1 = 150 kPa = 150 * 10^3 Pa
V1 = 2.48 L
V2 = 2.98 L
P2 = ?
Rearranging the formula making P2 the subject of the equation, we obtain;
P2 = P1 V1 / V2
P2 = 150 * 10^3 * 2.48 / 2.98
P2 = 372 * 10 ^3 / 2.98
P2 = 124.83 * 10^3 Pa or 124.8kPa
In other words, the new pressure of the helium gas after its volume was increased from 2.48 L to 2.98 L is 124.8kPa.
Which of the following describes a boiling point?
A. Phase change from a solid to a liquid occurring at a specific
temperature and pressure
B. Phase change from a liquid to a gas occurring at a specific
temperature and pressure
c. Phase change from a gas to a liquid occurring at a specific
temperature and pressure
D. Phase change from a solid to a gas occurring at a specific
temperature and pressure
Answer:
Phase change from a liquid to a gas occurring at a specific temperature and pressure
Explanation:
Boiling is a physical process in which a substance changes its state from liquid to vapor state.
In this context ,boiling point is the threshold temperature at which changes of state from liquid to vapor occurs. The boiling point also depends upon atmospheric pressure of environment as well. For the same substance, boiling point at two different pressure will differ significantly.
For example : Boiling point of water at sea level is 100 degree Celsius
while at 6,250 ft , Boiling point of water is 93.4 degree Celsius.
Based on above discussion option B Phase change from a liquid to a gas occurring at a specific temperature and pressure is the correct answer.
Answer: B) Phase change from a liquid to a gas occurring at a specific temperature and pressure.
When humans burn fossil fuels, most of the carbon quickly enters the_______
as carbon dioxide.
•hydrosphere
•atmosphere
•geosphere
•biosphere
Answer:
Atmosphere.
Explanation:
Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.
Need some help with these problems
b. a 0.5 M solution containing 250 g of manganese (II) chloride (MnCl2)
c. a 0.4 M solution containing 290 g of aluminum nitrate (Al(NO3)3)
complete question:
Calculate the volume of each solution, in liters.
b. a 0.5 M solution containing 250 g of manganese (II) chloride (MnCl₂)
c. a 0.4 M solution containing 290 g of aluminum nitrate (Al(NO₃)₃)
Answer:
b. L ≈ 4.00 litres
c. L ≈ 3.4 litres
Explanation:
Molarity is the number of moles of solute per litre of solution. Together a solute and a solvent makes a solution. The formula for molarity can be represented below
M = number of moles of the solute(mol)/L
where
M = molarity
mol = number of moles of the solute
L = litre of the solution.
Therefore ,
The volume of each solution can be computed below
b. a 0.5 M solution containing 250 g of manganese (II) chloride (MnCl₂)
M = number of moles of the solute(mol)/L
number of moles of MnCl₂ = mass/molar mass
molar mass of MnCl₂ = 55 + 71 = 126 g/mol
number of moles of MnCl₂ = 250/126
number of moles of MnCl₂ = 1.9841 moles
0.5 = 1.9841/L
cross multiply
0.5L = 1.9841
L = 1.9841/0.5
L = 3.97
L ≈ 4.00 litres
c. a 0.4 M solution containing 290 g of aluminum nitrate Al(NO₃)₃
M = number of moles of the solute(mol)/L
number of moles = mass/molar mass
molar mass of Al(NO₃)₃ = 27 + 14 × 3 + 48 × 3 = 27 + 42 + 144 = 213
number of moles = 290/213 = 1.3615 moles
M = number of moles of the solute(mol)/L
0.4 = 1.3615/L
cross multiply
0.4L = 1.3615
divide both sides by 0.4
L = 1.3615/0.4
L = 3.4 litres
What helps transport proteins made by ribosomes?