Solve the following problem: (12×10^9)÷(6×10^5)
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Describe the difference between chronic and acute exposure.
What is the empirical formula for a compound if a sample contains 3.72 g of P and 21.28 g of Cl?
Elvis eats a peanut butter sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Elvis plans to go for a run later this afternoon. He is breathing normally. What does he need from the food he ate and the air he breathes so that he can go on his run? How do Elvis' body systems work together to get the molecules he needs into his cells? How do his cells use these molecules to release energy for his body to run?
Sort the following situations into chemical change or physical change:1. salt dissolves in water2. Hydrochloric acid reacts with magnesium to produce hydrogen gas3. a piece of copper is cut in half4. a sugar cube is ground up5. water is heated and changed to steam6. iron rusts7. ethyl alcohol evaporates8. ice melts9. milk sours10. sugar dissolves in water11. sodium and potassium react violently with water12. pancakes cook on a griddle13. grass grows on a lawn14. a tire is inflated with air 15. food is digested in the stomach16. water is absorbed by a paper towel17. ethyl alcohol boils at 79 egress Celsius18. paper burns19. water freezes at 0 degrees Celsius20. fireworks explode21. alka-seltzer gives off carbon dioxide when added to water22. clouds form in the sky
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The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
What is Alchemy ?
Alchemy began to fully evolve into chemistry in the 17thcentury, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.
The alchemists were never successful in changing lead into gold, but modernnuclear physics can accomplish this task.
Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
Learn more about Alchemy here ;
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Answer : The mass percentage of carbon in sucrose is, 42.1 %
Explanation: Given,
Molar mass of C = 12 g/mole
Molar mass of H = 1 g/mole
Molar mass of O = 16 g/mole
First we have to calculate the molar mass of sucrose.
Molar mass of sucrose =
Now we have to calculate the mass of carbon in 5 g of sucrose.
As we now that there are 12 number of carbon atoms, 22 number of hydrogen atoms and 11 number of oxygen atoms.
The mass of carbon =
As, 342 g of sucrose contains 144 g of carbon
So, 5 g of sucrose contains of carbon
Now we have to calculate the mass percentage of carbon in sucrose.
Formula used :
Now put all the given values in this formula, we get:
Therefore, the mass percentage of carbon in sucrose is, 42.1 %
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
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Empirical formula referst to the simplest whole-number ration of atoms in a molecule. A compound's molecular formula can either be the same or multiple of its empirical formula. The structural and molecular formulas are also part of the compound formulas
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Answer: The given statement is false.
Explanation:
When there is more difference in the ratio or number of protons and neutrons then nucleus of the atom becomes unstable in nature. This unstability is caused due to greater repulsion between the like charges of sub-atomic particles.
As a result, this force of repulsion becomes greater than the binding energy. And, this force is known as the weak force because it is unable to bind the neutrons and protons together.
The proton and neutron ratio for smaller elements is 1:1 and for higher elements it has to be 1:5. Since, is a smaller element with 4 protons and 4 neutrons. Hence, the proton and neutron ratio is 1:1.
Therefore, is stable in nature.
Thus, we can conclude that the statement nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons), is false.