Answer: Breaking covalent bonds in molecules results in the dissipating the energy of atoms held together in molecules.
Explanation: By way of introduction,
Covalent bonds are one of four types of chemical bonds. The other three are ionic bonds, metallic bonds and hydrogen bonds. Each bond type differs in the way atom share electrons. In covalent bonds, two atoms completely share one or more pairs of electrons. These bonds are quite strong.
Covalent bonds form between atoms when the total energy present in the newly formed molecule is lower than the energy present in each of the atoms alone. The lower energy when bonded results from the fact that atoms are more stable when their outer electron shells are full. Atoms can fill their outer shells by sharing electrons with other atoms though the formation of covalent bonds.
It is important to know that there is a symmetrical relationship between the amount of energy released during the formation of a covalent bond, the amount of energy needed to break the bond. Breaking covalent bonds requires energy, and covalent bond formation releases energy.
This energy is measured as heat using the units joules or calories or kilocalories.
The amount of energy released during molecule formation can be estimated by counting the number and types of bond in a molecule. For instances, a methane molecule has one carbon atom bound to four hydrogen atoms via four single carbon-hydrogen covalent bonds. Carbon-hydrogen bonds release 100 kcal/mole of energy when formed, so the total energy needed to break all the bonds in a methane molecule is 100 kcal x 4 or 400 kcal.
Neutrons striking nuclei
a single large nucleus breaking apart
two small nuclei forming
The correct answer should be the endocrine system.
Hormones are secreted by endocrine glands in endocrine systems. Opposite of this would be the exocrine system consisting of exocrine glands.
Answer:
Nucleus
Chromosome
Gene
Explanation:
A simple explanation is that genes make up chromosomes, and chromosomes are located inside the nucleus. DNA is a thin, long string of codes and sequences that are basically the blueprint for making YOU. Genes are sections of DNA that are then shaped into a chromosome. Usually, 46 chromosomes are inside the nucleus. Having more or less chromosomes can lead to genetic problems.
Here's a photo to visualize. This photo is from Coolaboo.
Striations!
Striations means a series of ridges, furrows, or linear marks, and is used in several ways. In anatomy, striated muscle.