A P Chater 2 Checkpoint
Liliia Karakai
HSC 149 91
Allison Tsatsa
Due 02/12/2015
Checkpoint questions Chapter 2
1. Define atom Atom is the smallest stable units of matter
2. Atoms of the same element that have different numbers of neutrons are called _______. isotopes
3. How is that possible for two samples of hydrogen to contain the same number of atoms, yet have different weights? Exactly two atoms of hydrogen combine with one atom of oxygen. But individual atoms are far too small and too nomerous to be counted, so chemists use a unit called mole.
4. Define chemical bond and indetify several types of chamical bonds. Chemical bond - hold the participating atoms together once the reaction has ended. Three basic types of chemical bonds: ionic bonds, covalent bonds, hydrogen bonds.
5. Which kind of bond holds atoms in a water molecule together? What attracts water molecules to one another?
6. Both oxygen and neon are gases at room temperature. Oxygen combines readily with another elements, but neon does not. Why?
7. The chemical shorthand used to describe chemical compounds and reactions effectively is known as ________.
8. Using the rules for chemical notation, write the molecular formula for gkucoze, a compound composed of 6 carbons atoms, 12 hydrogen atoms and 6 oxygen atoms.
9. Indetify and describe three types of chemical reactions important to human physiology.
10. In cells, glucose, a six-carbon molecule, is converted into two thee-carbon molecules by a reaction that releases energy. How woud you classify this reaction?
11. What is an enzyme?
12. Why are enzymes needed in our cells?
13. Compare organic compounds to inorganic compounds.
14. Explain how the chamical properties of water make life possible.
15. Define pH, and explain how the pH scale relates to acidity and alkalinity.
16. What is the significance of pH in physiological systems?
17. Define the following terms: cid, base and salt.
18. How does an antacid help
HSC 149 91
Allison Tsatsa
Due 02/12/2015
Checkpoint questions Chapter 2
1. Define atom Atom is the smallest stable units of matter
2. Atoms of the same element that have different numbers of neutrons are called _______. isotopes
3. How is that possible for two samples of hydrogen to contain the same number of atoms, yet have different weights? Exactly two atoms of hydrogen combine with one atom of oxygen. But individual atoms are far too small and too nomerous to be counted, so chemists use a unit called mole.
4. Define chemical bond and indetify several types of chamical bonds. Chemical bond - hold the participating atoms together once the reaction has ended. Three basic types of chemical bonds: ionic bonds, covalent bonds, hydrogen bonds.
5. Which kind of bond holds atoms in a water molecule together? What attracts water molecules to one another?
6. Both oxygen and neon are gases at room temperature. Oxygen combines readily with another elements, but neon does not. Why?
7. The chemical shorthand used to describe chemical compounds and reactions effectively is known as ________.
8. Using the rules for chemical notation, write the molecular formula for gkucoze, a compound composed of 6 carbons atoms, 12 hydrogen atoms and 6 oxygen atoms.
9. Indetify and describe three types of chemical reactions important to human physiology.
10. In cells, glucose, a six-carbon molecule, is converted into two thee-carbon molecules by a reaction that releases energy. How woud you classify this reaction?
11. What is an enzyme?
12. Why are enzymes needed in our cells?
13. Compare organic compounds to inorganic compounds.
14. Explain how the chamical properties of water make life possible.
15. Define pH, and explain how the pH scale relates to acidity and alkalinity.
16. What is the significance of pH in physiological systems?
17. Define the following terms: cid, base and salt.
18. How does an antacid help