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ch2studyguide
| Question | Answer |
|---|---|
| Carbon-carbon bonds can be single ,double, or triple ionic bonds | f, covalent |
| The molecules of life are all ______based | carbon |
| ______are weak acids or bases that can react with strong acids or bases to prevent sudden changes in ph | Buffers |
| A substance made up of only one kind of atom is an _______ | element |
| A substance with equal numbers of h + ions and -OH ions is a ______ | neutral solution |
| The substances that are present when a chemical reaction begins are the ________ | reactants |
| The basic unit of matter is the ______ | atom |
| Phosphorus-32 is a _______ isotope because it has an unstable nucleus that breaks down over time | radio active |
| The energy needed to start a chemical reaction is called the ________ | activation energy |
| The ph scale is a measurement system that indicates the concentration of ______in solution | h+ ions |
| A chemical bond formed by the transfer of electrons is an ____bond | ionic |
| The stomach produces an ____that lowers the ph and helps digest the food | acid |
| Neutrons and ______are found in the nucleus of an atom | protons |
| Of the tree subatomic particles _____are most involved in forming chemical bonds | electrons |
| A substance that speeds up the rate of a chemical reaction is called _____ | catalyst |
| Water molecules are polar with the ______ | oxygen side being slightly negative and the hydrogen side being slightly positive |
| Of the 6 electrons 4 are valence electrons. How many covalent bonds can a carbon atom form | 4 |
| Is an atom contains 11 protons and 12 neutrons ,its atomic number is____ | 11 |
| A covalent bond is formed as the result of ____ | Sharing electrons |
| The ph or rain in new york state varies from 4.22 to 4.4 according to these figure, the most acidic rainfall has a ph of ___ | 4.22 |
| What type of electron is available to form bonds | Balance |
| In a water molecule ,shared electrons spend more time around the oxygen atom than the hydrogen atom as a result the oxygen atom is ____ | Slightly negative |
| A substance with a ph of 6 is called ____ | acid |
| What kinds of atoms are boded to carbon atoms in the molecule shown is figure 2.2 | hydrogen, oxygen, and nitrogen |
| When salt is dissolved in water, the water is the ______ | solvent |
| Which of the following makes u a molecule of water | 2 atoms of hydrogen and 1 atom of oxygen |
| The tree particles that make up atoms are ____ | protons neutrons and electrons |
| Enzymes effect the reactions in living cells by changing the _____ | speed of the reaction |
| If the p of stomach acid and of oven cleaner where measured ___ | the ph of stomach acid would be below 7 but the ph of oven cleaner would be above 7 |
| Which property of water causes the curve to surface shown in figure 2-1 | adheastion |
| What is a process that changes one set of chemicals into another set of chemicals | chemical reaction |
| Amino acid is to protean as ___ | simple sugar is to starch |
| Ica tops are atoms of the same element with the same number of protons and a different number of ____ | neutrons |
| The energy needed to get a reaction started is the ____ | activation energy |
| If an atom contains 3 protons 4 neutrons and 3 electrons mass number is | 7 |
| what type of ion forms when an atom looses electrons | positive |
| A chlorine atom that has 20 protons and 21 neutrons is called ____ | chlorine-41 |
| What are found in the space surrounding the nucleus of an atom | electrons |
| If a ration in one direction releases energy, the reaction in the opposite aria ___ | absorbs energy |
| A solution is a ____ | mixture in which the substances are evenly spread out |
| Which of the following is substance forme by the chemical joining of two or more elements indefinite amounts | compound |
Created by:
amgrace