Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.
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Carbon -14 is an example of dating
Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 Amu
The periodic table is based on an element'sa. atomic number. b. atomic mass. c. molecular size. d. molecular mass.
A sample of Ca(OH)2 is considered to be an Arrhenius base because it dissolves in water to yieldA. Ca2+ ions as the only positive ions in solution B. H3O+ ions as the only positive ions in solution C. OH– ions as the only negative ions in solution D. H– ions as the only negative ions in solution
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Answer:
Explanation:
1 mol of helium contains 6.022 × 10²³ atoms
The balloon contains .
69.253 helium particles are in the balloon.
What is helium particles?
Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen, a closed-form solution to the Schrodinger equation for the helium atom has not been found.
A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen, a closed-form solution.
Helium is the element which you can find on the upper right side of the periodic table with atomic number 2. It comes first amongst the family of the noble gases. Helium falls under inert gas since its outermost electron orbital is full with two electrons.
The answer is 69.253.
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Answer: There are 6 mole of oxygen present in 1 mole of .
Explanation:
The given formula of compound is . In this compound, there are 1 mole of magnesium, 2 mole of chlorine and
mole of oxygen atom.
Therefore, we can conclude that the total number of moles of oxygen atoms present in 1 mole of is 6 mole.
Thats the question right? the answer is 6
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So we are going to take our known value of 4 moles, and multiply by 6.02 x 10^23 (Avogadro's number) and we will get the number of atoms that are in 4 moles.
(4.0 moles of Na) x (6.02 x 10^23) / (1 mole) = 2.4 x 10^24 atoms of Na
There are 2.4 x 10^24 atoms of Na in 4.0 moles.
Final answer:
To find the number of atoms in 4.0 Mol of sodium, you need to multiply the number of moles by Avogadro's number. This will give you approximately 2.4088 x 10^24 atoms.
Explanation:
To calculate the number of atoms in 4.0 Mol of sodium, you need to use Avogadro's number, which is 6.022 x 1023 atoms per mole. The calculation is as follows:
Start with the number of moles given, which is 4.0 mol.Multiply this by Avogadro's number (6.022 x 1023) to get the total number of atoms:4.0 mol x 6.022 x 1023 atoms/mol = 2.4088 x 1024 atoms
So, there would be approximately 2.4088 x 1024 atoms in 4.0 mol of sodium.
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(2) 37°C (4) 298 K
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Answer;
37 ° C
Explanation;
-The average kinetic energy of gas particles is directly proportional to the the temperature. An increase in temperature increases the speed at which the gas molecules move, and thus increasing their kinetic energy. At any given temperature gases have the same kinetic energy.
-Hence, the temperature at which Helium gas will have the highest kinetic energy is at the highest temperature, which is 37° Celsius.
Answer:
2: 37°C
Explanation:
This is because the temperature at which Helium gas will have the highest kinetic energy is at the highest temperature, which is 37° Celsius.
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Answer: Iron is considered as a Group B element.
Explanation:
Mendeleev divided the periodic table into 8 groups, each divided into two sub-groups named as A and B. He arranged the elements according to their atomic masses.
Group A elements are considered as the elements which are present in s-block and p-block.
Group B elements are the transition elements. Transition elements are the elements that belong to d-block.
From the given elements:
Lithium (Group 1-A) and helium (Group VIII-A) are s-block elements.
Tellurium is a p-block (Group VI-A)element.
Uranium is a f-block element.
Iron is the d-block (Group VIII-B)element (transition element)
Hence, iron is considered as a Group B element.
A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
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Melting of wax is a physical change and chemical change is the burning of candle.
What is chemical and physical changes?
Chemical changes are those changes by which composition of the original matter changes and physical changes are those changes by which only appearance of the matter changes.
In the given activity:
- Melting of wax is a physical change because during this composition of wax not changes but only outer structure changes.
- Burning of candle and lighting the match are chemical change as it produces energy in the form of heat and light.
Hence, Roger is correct ie. The melting wax is a physical change and the burning candle wick is a chemical change.
To know more about physical and chemical changes, visit the below link:
brainly.com/question/17166994
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