<span>B)<span>C2H6O<span>2
</span></span></span>
First, convert each percentage to grams: 38.7g, 9.70g, and 51.6g.
Next, calculate the number of moles of each element, based on the number of grams given.
C = 3.23 mol
H = 8.91 mol
O = 3.23 mol
Set up the ratio of moles of each element:
C3.34H9.70O3.23. Convert the decimals to whole numbers by dividing by the smallest subscript, 3.23.
The empirical formula is CH3O.
Now, compute the formula mass, which is 31. Finally, divide the molecular mass by the formula mass, 62/31 = 2. Multiple the subscripts by 2 to get the molecular formula.
Answer:
magnesium metal melts = physical change
magnesium metal ignites = chemical change
Explanation:
<em>Physical changes</em> are those in which the identity of the subtance <u>remains unaltered</u>. No new compounds are formed. They involve generally changes in <u>agreggation states of matter</u>: solid, liquid or gas. The first experiment, in which magnesium metal melts is a physical change because it only changes the state of matter, from solid to liquid, but it is still magnesium metal.
Conversely, <em>chemical changes</em> involve atoms combinations to form new compounds. The second experiment, in which magnesium metal ignites, is a chemical change. After the change, magnesium metal is no longer the metal but a metal oxide.
<span>Answer : B. hope it helped</span>
Tap water contain mineral molecules while purified water doesn't but that doesn't make it non conductor it is just a weak conductor
The weakness of the rutherford model of the atom that bohr addressed is that
- The energy of the atom is quantized and
- The atom does not lose energy as the electon rotates about the nucleus
<h3>What is Rutherford model of the atom?</h3>
The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.
<h3>What is the Bohr model of the atom?</h3>
The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that
- the energy of an atom is quantized and
- that it does not lose energy as the electron rotates about the nucleus.
<h3>What was the weakness of the rutherford model of the atom that bohr addressed?</h3>
The weakness of the rutherford model of the atom that bohr addressed is that
- The energy of the atom is quantized and
- The atom does not lose energy as the electon rotates about the nucleus
Learn more about Rutherford model of the atom here:
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