the volume of liquid can be measured with? A. graduated cylinder B. pan balance C. scale D. metric ruler
1 answer:
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Answer:
See explanation and image attached
Explanation:
When 1 mole of hydrogen is added to 3-hexyne, the addition occurs on the same face or side of the triple bond to yield cis-2-hexene in the presence of lindlar catalyst which prevents further hydrogenation. This is known as syn addition.
The syn addition is achieved because the hydrogen molecule is first adsorbed on the surface of the palladium metal and is subsequently attached to the same face of the triple bond in 3-hexyne as shown in the image attached to this answer.
Answer 1) Butane : It is a compound which is made up by combination of elements of carbon and hydrogen together. It contains four carbon atoms which has ten atoms of hydrogen. The bonds between carbon and hydrogen are formed by covalently sharing of electrons. Therefore, butane is a compound.
Answer 2) Benzene : It is also a compound. Benzene contains six molecules of carbon and six molecules of hydrogen. They are covalently bonded with hydrogen atoms around the carbon atoms. It is termed as compound because it cannot be separated chemically.
Answer 3) Gasoline : This is an example of mixture. Gasoline usually contains mixture of many hydrocarbons in the compound state. It consists of mainly hydrocarbons which are between 4 to 12 carbon atoms per molecule (C4 - C12). It is majorly has the mixture of paraffins (which are alkanes), cycloalkanes (which are naphthenes), and olefins (which are alkenes). So, it will be correct to assign the term mixture to gasoline.
Answer 4) Kerosene - It is a mixture. Kerosene is made up of mixture of hydrocarbons. The chemical composition mainly depends on its source, but it usually consists of about ten different hydrocarbons, where each contains ten to sixteen carbon atoms per molecule. Therefore, assigning kerosene as a mixture is correct.
Answer 5) - It is an element. The molecular formula of oxygen is
. Which states that when found in diatomic state the oxygen is stable and can exist freely in nature. The elemental form of oxygen is in the diatomic form. Therefore, oxygen (
) is an element.
Fluorine has C seven valence electrons.
Valence electrons are the electrons that are found on the outer shell of an atom that are capable of participating in chemical reactions. The easiest way to figure out how many valance electrons Fluorine has would be to look it up in a periodic table and notice that it a group 7 element and therefore has 7 valence electrons.
The other way to tell that Fluorine has 7 valence electrons is to notice that an element with an atomic number of 9 has 9 electrons. The electronic configuration of elements has the first 2 electrons go on the first shell or energy level , the leaving the next 7 to go to the second shell
which can take up to 8 electrons.
This means that Fluorine has 7 seven valence electrons.