Answer:
a
Explanation:
A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answer:
B.
Explanation:
I need help with Hess law
Answer:
The energy changes in converting reactants to products is the same regardless of the route by which the chemical changes occur.
PS.
13. Calculate the number of representative particles of each substance.
a. 11.5 mol Ag
c. 0.150 mol NaCl
b. 18.0 mol H2O
d. 1.35 x 10-2 mol CH4
What is the wavelength of a photon with a frequency of 7.81 x 1014 Hz?
Explanation:
If you know the frequency of the photon, you can calculate the wavelength using the equation λ=cν where c is the speed of light and ν is the frequency.
λ=cν
f=T^-1,f=1/7.81×1014s
c=3×10^8m/s
λ=3×10^8m/s×1/7.81.×1014s
λ=37881.94m
Explain why using standard chemical names for compounds would be important when working in a laboratory.
Answer:
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Explanation:
Which of the following could be the hypothesis supported by an investigation that demonstrates the law of conservation of mass in relation to chemical reactions?
A. If the reaction obeys the law of conservation of mass, then mass will be the same before and after the reaction.
B. If the reaction obeys the law of conservation of mass, then mass will increase after the reaction.
C. If the reaction obeys the law of conservation of mass, then mass will be different before and after the reaction.
D. If the reaction obeys the law of conservation of mass, then mass will decrease after the reaction.
According to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. If the reaction obeys the law of conservation of mass, the mass before and after the reaction will be the same.
What does the law of conservation of mass?Any element's mass at the start of a reaction will equal its mass at the end of the reaction. Accounting for all reactants and products in a chemical reaction results in the same total mass at any point in time in any closed system.
When coal, for example, is burned, the carbon atom transforms into carbon dioxide. The carbon atom undergoes transformation from solid to gas, but its mass remains constant.
According to the law of conservation of mass, the amount of mass that enters a chemical reaction in the form of reactants must equal the amount of mass that exits the reaction process in the form of products. This is only possible in a closed system. For example, if 2g of reactant A reacts with 32g of reactant B, the mass of the product AB formed is 34g.
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An element has the atomic number 72. The number of protons and electrons in a neutral atom of this element is
Explanation:
Hi,
The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.
I hope this helps :)
If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.
What is meant by an Atomic number?An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.
According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.
Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.
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The gas in an aerosol can is at a pressure of 3.16 atm at 32.2°C. What would the gas pressure in the can be at 22.9°C?
Answer:
The pressure of the gas would be 3.06 atm
Explanation:
Amonton's law states that the pressure is directly proportional to the absolute temperature of a gas under constant volume. The equation is:
P1 / T1 = P2 / T2
Where P1 is the initial pressure = 3.16atm
T1 is initial absolute temperature = 273.15 + 32.2°C = 305.35K
P2 is our incognite
And T2 is = 273.15 + 22.9°C = 296.05K
Replacing:
3.16atm / 305.35K = P2 / 296.05K
3.06 atm = P2
The pressure of the gas would be 3.06 atmpls ans quicckk two q
Answer:
there is nothing here
Explanation:
YALL KNOW WHATS UPPPPP
HAIIIII REEEEEEE
answer this question no links
Answer:
it is b, a stethiscope is the thing they put on your heart
Explanation:
A greater force is required to move an object with a larger mass than one with a smaller
mass.
Answer:
Explanation:
what do u need to know
if there is a bottle of grape juice with 20% juice and there is 1000mL of total drink, how many mL of water
is in the bottle?
Answer:
760ml of water
Explanation:
Answer: 800mL
Explanation:
20% of 1000mL is 200. 1000mL - 200mL is 800mL
What is a precipitation
reaction?
Answer:
A precipitation reaction is one in which substances in solution are mixed and an insoluble product is made. The insoluble product is called a precipitate and can be seen as a solid forming in the reaction mixture.
¿A que se refiere la amplitud de una onda sinusoidal?
Why particles start vibrating in solids?
it's argent
Explanation:
The particles of matter are continuously in motion due to which tehy collide with each other, and this creates a vibration in the solids
I hope it is correct ☺️
A solution of KOH is prepared with a [OH-] concentration of 3.3 × 10-2 M. Calculate [H+], pH, and identify whether the solution is acidic, basic, or neutral.
Answer:
[H⁺] = 3.03x10⁻¹³ MpH = 12.52The solution is basicExplanation:
We can first calculate [H⁺] by using the formula:
[H⁺] * [OH⁻] = 1x10⁻¹⁴[H⁺] * 3.3x10⁻² = 1x10⁻¹⁴[H⁺] = 3.03x10⁻¹³ MNow we proceed to calculate pH:
pH = -log [H⁺]pH = -log (3.03x10⁻¹³)pH = 12.52As the pH is higher than 7, the solution is basic.
Question 1 of 10
Which of these is an advantage of wind energy?
A. It increases greenhouse gas emissions,
B. It generates noise pollution,
c. It generates electricity
0
D. It reduces bird and bat populations.
Help please I’m confused
Answer:1 answer number 1
Explanation:
Why does the chloride ion have a charge of -1
Explanation:
As we know that chloride ion is halogen. So it has seven valence electrons in its valence shell. Hence it gains one electron from others during chemical reaction to be stable. So Chloride ion have a negative charge of -1.
Hope it will help :)❤
(b) Potassium and sodium are kept in dark reagent bottles filled with paraffin oil.
Explain why.
Answer:
these metals are stored in kerosene because kerosene contains no water and protects these metals from being exposed to any moisture in the air that would cause these metals to react, potentially violently.
What is an example of a microorganism acting in a harmful way?
Answer:
bacteria spoiling food
hope this helps
have a good day :)
Explanation:
What causes the pressure inside oxygen tanks to change as they are filled?
A. The temperature of the gas changes.
B. The volume of the container changes.
C. The pressure outside the tanks changes.
D. The number of gas molecules changes.
Answer:
The answer would be D.
: )
Explanation:
The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.
What are oxygen tanks?Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.
As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.
By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.
Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.
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ALEX RODE HIS BIKE
60 km in 4 Hours. How FAST WAS HE GOING
Answer:
15 km/hour
Explanation:
You need to find how fast he was going per hour.
Answer: 15
Divide. 60 ÷ 4
This gives us 15. So, Alex was going 15 mph
Alcohol and water are placed into closed-end manometer, in order to measure the vapor pressure of each of the 2 liquids at 25oC. the figure represents the observation few hours after placing the liquids.
a) Calculate the Vapor pressure of alcohol P vapor (alcohol) in mmHg and atm.
(choose 2 answers!)
1) Vapor pressure in mmHg = 100mm Hg
2) Vapor pressure in mmHg = 50mm HG
3) Vapor pressure in atm = 0.13 atm
4) Vapor pressure in atm = 0.26 atm
Answer:
3) Vapor pressure in atm = 0.13 atm
Explanation:
If energy was added to solid, what state would it change to
A. Super solid
B. Plasma
C. Liquid
Answer:
Explanation:
The answer is C Liquid
Consider the combustion of pentane (C5H12)
a. Write the complete, balanced equation:
b. Determine the limiting reactant if 62.5 grams of pentane combine with 107 L of oxygen gas at STP.
c. If 54.6 L of CO2 gas is produced in the experiment, what is the percent yield?
Explanation:
C5H12 + 8O2 → 5CO2 +6H2O
balanced✓
stable✓
The diagram below represents the bone
arrangements in the front limbs of three different
species of mammals.
The similarities and differences in these limbs
suggest that all three species developed from the
same ancestor, but
Answer:
these species share a common ancestor
Explanation:
i need help with this pls
I know it’s E and A
Explanation: did you count it’s exactly 28, also the electrons are not visible.
Ps: I’m in 5th grade, what grade is this, if my suggestion was correct then holy crackers.
What is the velocity of a wave with a wavelength of 0.03 m and a frequency of
120 Hz?
A. 0.28 m/s
B. 4000 m/s
C. 3.6 m/s
D. 2.5x 10-4 m/s
Answer:
A
Explanation:
Got a calculation of 8.05297
Answer:
C. 3.6 m/s
Explanation:
I just took a test on a-pe-x and it was correct! :)
¿Cuál de estas sustancias exhibe combustibilidad?
El acero.
El hierro.
El vidrio.
El papel.
Answer:
Acero
Explanation:
If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?
Answer:
A = 349 g.
Explanation:
Hello there!
In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half-life as shown below:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}[/tex]
Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:
[tex]A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g[/tex]
Regards!
