Answer:
Oxygen, bromine, iron, helium
Explanation:
is defined as the standard enthalpy of formation. By definition, the standard enthalpy of formation is equal to 0 kJ/mol for the substances in their standard states, that is, at room temperature and 1 atm pressure.
Simply speaking, looking at the substances given, we need to understand whether their states agree with what we expect to see at standard conditions (e. g., sodium is a metal, fluorine is a gas, bromine is a liquid at standard conditions). Those are substances consisting of just one type of atoms.
- Firstly, oxygen is a gas at standard conditions and it is diatomic, so its .
- Although nitrogen is a gas at standard conditions, it is diatomic, so .
- Water is a liquid at standard conditions, however, it consists of two types of atoms, hydrogen and oxygen, so .
- Bromine is a liquid at standard conditions, so .
- Iron is a solid at standard conditions, it's a metal, so .
- Helium is a gas at standard conditions, it belongs to noble gases, so .
- Sulfur is a solid at room conditions, however, the conformation it has is and not , so .
Answer: It informs the audience if the study included controlled tests.
Explanation: Usually, scientific conferences involve presentation of papers by scientists. These paper presentations are actually the sharing of details of the scientific research carried out by other scientists.
Presenting the materials and methods section of the a research project to a scientific conference informs the audience if the study included controlled tests.
The inclusion of controlled tests in a scientific study enhances the validity of the results obtained in the study.
Mass is how much matter is in an object. Volume is how much space an object occupies. Density is the amount of mass in a volume.
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The answer is: A; Free Energy
There are three kinds of Hydrogen in 2-methyl-2-butene
The correct question is
How many kinds of hydrogen atoms are present in 2-methyl-2-butene
<h3>What is an atom ?</h3>
Atom was discovered by Dalton's Atomic theory , he predicted that each element consist of large number of a very small thing known as atom.
In the structure of 2-methyl-2-butene there are 3 types oh Hydrogen
1. Attached to the Carbon atom connecting the methyl ion to the butene
2. Connected to the last Carbon atom
3. Connected to the Carbon bond having double bond.
Therefore there are three kinds of Hydrogen in 2-methyl-2-butene.
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