The temperature change indicates an increase in the average kinetic energy of the molecules in a sample is 15°C to 298 K. Thus option 1 is correct.
Kinetic energy is defined as a form of energy that an object or particle has by the reason of its movement.
It can also be defined as the measure of the work that an object does by virtue of its motion.
Average kinetic energy is defined as a product of half of the mass of each molecule and the square of RMS speed.
The kinetic energy id directly proportional to temperature, with increase in temperature kinetic energy increases.
Thus, the temperature change indicates an increase in the average kinetic energy of the molecules in a sample is 15°C to 298 K. Thus option 1 is correct.
To learn more about kinetic energy, refer to the link below:
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B: H2o
C: HI
D: C3H8
Hydrogen bonds take place between the molecules of H2O.
• Hydrogen bonding takes place only in the molecules where the hydrogen is covalently bonded to nitrogen, oxygen, or fluorine.
• The electronegativity of these three elements is so much that they withdraw most of the electron density in the covalent bond with hydrogen, leaving the atom of hydrogen extremely electron-deficient.
• In the molecule of water, the nucleus of oxygen with +8 charges attracts electrons better than the nucleus of hydrogen with its +1 charge.
• The hydrogen atoms apart from being covalently bonded with the atoms of oxygen are also attracted towards the oxygen atoms nearby. This attraction is the basis of the hydrogen bonds.
Thus, option B, H2O is correct.
To know more about:
Hydrogen bonds can be found between molecules of H2O (water). This is due to the fact that water has a highly electronegative oxygen atom and hydrogen atoms capable of forming a dipole interaction, thereby constituting a hydrogen bond.
Hydrogen bonds can be found between molecules of substance B: H2O, also known as water. Hydrogen bonding occurs when a highly electronegative atom such as Oxygen (O), Nitrogen (N), or Fluorine (F) is involved and there is a hydrogen atom attached to these. In the case of water, there are two hydrogen atoms bonded to a single oxygen atom, which is highly electronegative. These specific features allow for the formation of a relatively strong dipole interaction, called a hydrogen bond, between separate water molecules.
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The balanced chemical reaction will be:
2KClO3 = 2KCl + 3O2
We are given the amount of potassium chlorate being burned. This will be our starting point.
400.0 g KClO3 1 mol KClO3/ 122.55 g KClO3) (3 mol O2/2 mol KClO3) ( 32.00 g O2/1mol O2) = 156.67 g O2
Percent yield = actual yield / theoretical yield x 100
Percent yield =115.0 g / 156.67 g x 100
Percent yield = 73.40 %
Answer is: another name for groups of elements is family.
There are 18 numbered groups in the periodic table.
The elements in a group have similar physical or chemical characteristics and some groups have a specific name, for example group 17 (the halogens).
Elements in the group have the same number of valence electrons, for example, chemical elements in group 15 of the periodic table have neutral atom with a valence electron configuration of ns²np³.
In Chemistry, groups of elements are often referred to as families or groups.
In Chemistry, groups of elements are often referred to as families or groups. These groups are organized based on similar properties and characteristics. For example, the alkali metals (group 1) and the halogens (group 17) are two well-known families of elements.
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evaporation.
freezing.
melting.
18.If you were to pour into a container materials in all three phases of matter, which phase would most quickly spread out to fill the container?
Solid
Liquid
Gas
Evaporated