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Biology - Chapter 2
10th Grade Biology - Chapter 2 Test
| Question | Answer |
|---|---|
| Water molecules are polar, what does this mean? | oxygen side being slightly negative and the hydrogen side being slightly positive. |
| Ice floats on water because? | Water expands as it freezes |
| The most abundant compound in most living things is? | Water |
| Atoms are composed of what three subatomic particles? | Protons, neutrons, electrons |
| A substance with a pH of 4 is called? | An acid |
| What type of electron is available to form bonds? | Valence |
| Ionic bonds form between elements that have _________ charges. | Opposite charges |
| What atoms make up a molecule of water? And How many of each? | Two atoms of hydrogen and one atom of oxygen |
| If an atom contains 14 protons and 15 neutrons, its atomic number is what? | 14 |
| The space surounding the nucleus of an atom contains which subatomic particles? | Electrons |
| What is the primary factor that determines the polarity of a bond between atoms? | The difference in the relative attraction of electrons to each atom |
| A covalent bond is formed as the result of ______________ electrons. | Sharing electrons |
| Isotopes are atoms of the same element with the same number of protons and __________ of neutrons. | Different Numbers |
| Why do noble gases not form bonds? | Their outer energy levels are full |
| What are the uses of radioactive isotopes? | Used to treat cancer and kill bacteria that spoils food, determine age of rocks and fossils, used as "tracers" to follow movement of substances inside organisms |
| What is the definition of valence electrons? | Valence electrons are involved in bonding. |
| If an atom contains 5 protons, 6 neutrons, and 5 electrons, its mass number would be? | 11 |
| What type of ion forms when an atom loses electrons? (charge?) | Positive |
| When hydrogen and oxygen combine to form water, water is what? A product or reactant? | Product |
| Describe when covalent bonds form | Two hydrogen atoms share electrons with one oxygen atom |
| In a water molecule, shared electrons spend more time around the oxygen atom then the hydrogen atoms. As a result, the oxygen atom is what? | Slightly negative |
| Three particles that make up atoms are? | Protons, neutrons, and electrons |
| What is the maximum number of covalent bonds that can formed between a single nitrogen atom and 1 or more hydrogen atoms? | 4 |
| As part of an experiment, a student adds 20 ml of 5% Sodium Hydroxide solution (s strong base) to 100 ml of Water. What is the most likely result? What happens to the concentration of H+ ion and OH ions? | the concentration of hydrogen ions (H+) will increase, |
| A molecule that has a partial positive charge on one side and a partial negative charge on the other side is called? | A Polar Molecule |
| Solutions that contain concentrations of H+ ions lower than pure water are called? | are bases |
| The bond formed when two atoms share a pair of electrons is called ? | Covalent bond |
| Breaking which type of bond would require the most energy? Covalent, Ionic or Hydrogen bond? | Covalent |
| The electrons of an atom are found where in the atom? | Occupy the space surrounding the nucleus |
| In a chemical reaction, atoms are? | Rearranged |
| Carbon-14 is a radioactive isotope used to determine the age of ancient objects composed of organic matter. Carbon-12 and carbon-13 are other isotopes. The number of what subatomic particles varies among these carbon isotopes? | neutrons |
| An atom that has gained or lost electrons is called? | An Ion |
| Identify the reactants(s) in the chemical reaction, C6H12O2 +H2) ---> 6CO2 + 6H2) + Energy. | CO2 and H2O |
Created by:
tonilynne1
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