BIO FINAL SANDALL FRESH
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- solutions that contain concentrations of H+ ions lower than pure water are...
- are bases
- a substance w/ a pH of 6 is
- an acid
- what type of ion forms when an atom loses electrons
- posotive
- water molecuoles are polar w/ the
- oxygen slightly negative and hydrogen slightly posotive
- if the pH of stomach acid and oven cleaner were measure
- pH of stomach acid would be below 7, but, pH of oven cleaner would be above 7
- if an atom contains 11 protons and 12 neutrons its atomic number
- 11
- when hydrogen and oxygen combine and form water, water is
- a product
- the nucleus is made of
- protons and netrons
- if an atom contains 11 protons and 12 neutrons. its mass number is
- 23
- ice floats on water because
- molecules are less densly packed than those in a liquid
- a substance formed by the chemical combination of 2 or more elements in a fixed ratio
- compound
- radioactive isotopes used in research and medecine are
- oberve what happens to different atoms within organism
- a covalent bond is formed as the result of
- sharing an electron pair
- space surrounding the nucleus of an atom contains
- electrons
- most common elements in most living things arer
- oxygen. carbon. hydrogen. and nitrogen
- a solution is a
- uniform mixture of 2 or more substances
- a map of Eastern North America, showing the pH of rainfall in carious states indicates the pH of rain in New York State state varies from 4.22 to 4.40. acording to thesee figures the most acidic rainfall in New Yourk state has a pH of
- 4.22
- the reactants in the chemical reaction, CO2 + H20 -> h20CO3
- CO2 and H2O
- isotopes are atoms of the same element / same number number of protons and
- a different number of neutrons
- in chemical reactions, atoms are
- rearranged
- which makes up a molecule of water
- 2atoms of hydrogen and 1 oxygen atom
- 3 particles that make up an atom are
- protons, neutons, and electrons
- when salt is dissolved in water, water is the
- solvent
- the substances that are presend when a chemical reaction begins are the products
- FALSE
- scientists show how the number and types of atoms in a molecule using a chemical formula
- TRUE
- when atoms share 6 electrons. they are joined by a double bond
- FALSE
- a substance with equal numbes of H+ ions and OH - ions is a basic solution
- FALSE
- usually its the electrons in the lowest energy level of an atom that determine how the atom reacts
- FALSE
- buffers are substances that cause a solution to resisit change in pH
- TRUE
- a pure substance that cannot be broken down into other substances by chemical means is an element
- TRUE
- adhesion is responsible for causiong the surface of the water in a graduratetd cylinder to curve slightly at the sides
- TRUE
- when a substance is dissolved in water, the result is called a solute
- FALSE