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Chemistry
Review for Exam
| Question | Answer |
|---|---|
| Which of the following is NOT a physical property of water? | It is composed of hydrogen and Oxygen |
| The properties of a compound are the same as the properties of the element that is present in the largest proportion of the compound. T/F? | False |
| Appears the same throughout--same stuff | Homogeneous |
| A chemical bonding of two or more different atoms | compound |
| A physical separation of a mixture of two liquids using boiling points | distolation |
| A physical separation of a mixture by particle size using a porous barrier | filtration |
| a physical blend of two or more substances | mixture |
| not uniform in composition | Heterogeneous mixture |
| One of the differences between a mixture and a compound is that ... | a compound can only be separated into its components by chemical means |
| a compound can only be separated into its components by chemical means | Has fixed ration of elements that it is made of |
| Which is the separation technique that relies on the different boiling points of the parts of the mixture? | distillation |
| Matter that has a uniform and unchanging composition is called a pure substance. T/F? | True |
| Which of the following descriptions best classifies aluminum foil? | Homogeneous pure element |
| Mixtures can be separated by a series of physical changes. T/F? | True |
| Matter is defined as anything that... | has matter and takes up space |
| silver is classified as an | element |
| table salt is classified as an | compound |
| chocolate chip cookie is classified as an | mixture |
| fresh-squeezed orange juice is a | mixture |
| Seawater is a pure substance T/F? | False |
| The magnetization of an iron rod is an example of a chemical change. T/F? | False |
| An 8.00-g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. How many grams of oxygen are used in the reaction? | 7.20 g |
| Which of the following processes does NOT involve a change in chemical properties? | boiling |
| A chemical composition of two or more different elements joined together in fixed proportions is known as a/an ____ | compound |
| Which is NOT a chemical change | ingredients for a cake are stirred together |
| Which is the state of matter that has a definite shape and definite volume? | solid |
| Which term is described as the amount of matter in an object | mass |
| Which of the following substances is an element? | Iron |
| An object has a mass of 26.94 grams and a volume of 2.568 cubic centimeters. What material is it likely to be made of? | Silver (10.49) |
| Which of the following are physical changes? | Ice melts to form water and sugar dissolves in water |
| A compound is... | a fixed ration of elements that is is made of. |
| Which scientist described the existence of the neutron? | Chadwick |
| How many protons, electrons and neutrons does an atom with an atomic number 50 and a mass number of 120 contain? | 50 protons, 50 electrons and 70 neutrons |
| Stated at all elements were made of atoms and the atoms for the same element were all alike. Elements combine in definite proportions. | Dalton |
| Electrons orbit around the nucleus. | Bohr |
| Discovered Atoms as mostly empty space with a positive nucleus. | Rutherford |
| Plum Pudding model. Electrons in a sea of positive charge | Thomson |
| Said Atoms were the smallest piece of matter and could not be cut. | Democritus |
| Which is the number of neutrons in 80/35 | 45 |
| An element has an atomic number of 80. How many protons and electrons are in a neutral atom of the element? | 80 protons/electrons |
| According to the modern concept of the atom, which are located in the nucleus of an atom? | Protons and Neutrons |
| Which element has 14 protons? | Silicon |
| All atoms of the same element have the same... | number of protons |
| the central part of a an atom, containing protons and neutrons | nucleus |
| a negatively charged subatomic particle | electron |
| the smallest part of a of an element that retains the properties of that element | atom |
| a subatomic particle with no charge | neutron |
| a positively charged subatomic particle | proton |
| Which has a charge of +1? | proton |
| When a chemical change occurs, the products have a greater mass than the reactants? T/F? | False |
| the average mass of a naturally occuring element is very close to the mass of the elements most abundant isotope. T/F? | True |
| What is true about atoms? | Atoms are made up of mostly empty space with a small dense nucleus, 99.9% of the mass of the atom is in the nucleus but the nucleus makes up less than 1% of the volume |
| Strong force is the energy that binds a nucleus of an atom together. T/F? | True |
| An atom of an element is unstable when it has to few or to many protons compared to the number of neutrons. T/F? | True |
| Isotopes are forms of an element that have the same number of protons but a different number of electrons. T/F? | False |
| The average mass of a naturally occurring element is very close to the mass of the heaviest isotope of that element. T/F? | False |
| The mass of a neutron is approximately equal to the mass of a proton | True |
| Valence electrons are the electrons in outside orbitals of: | s and p |
| The number of electrons in an orbital depends on the orbital’s shape. | false |
| there are a total of 5 different types of d-orbital | true |
| Which block contains 5 orbitals? | D |
| Which is the halogen that is in Period 5? | Iodine |
| Which is the energy level that is being filled by electrons in the transition elements of period 5? | fourth |
| In which pair is the one on the left larger than the one on the right? | K, K+ |
| Which correctly describes elements in the same group? | They have the same number of valence electrons |
| The radius of an atom is defined as half the distance between the nuclei of two adjacent or bonded atoms of that element. T/F? | True |
| An element can be identified by the characteristic bright-line atomic emission spectrum it can produce. T/F? | true |
| The electronegativity of elements increases from left to right and from top to bottom on the periodic table. F/T? | False |
| Why do copper compounds turn green when placed in a fire? | Coppers electrons absorbs a specific amount of energy and then releases it in the form of a green flame |
| Which is a transition element with five d-block electrons in energy level 4? | Technicium (Tc) |
| Valence refers to the total number of electrons that exist in the orbitals that occupy the outermost energy level of an atom. T/F? | True |
| Which is defined as the energy required to remove an electron from an atom of an element in the gaseous state? | Ionization energy |
| Which category of elements is commonly used to make computer chips and solar cells due to their ability to conduct electricity only under certain conditions? | metalloids |
| All of the nonmetals on the periodic table are gases. T/F? | False |
| The electronegativity of elements increases from left to right and from top to bottom on the periodic table. T/F? | False |
| Elements in the same family tend to have the same number of valence electrons. T/F? | True |
| When an atom loses electrons, its radius gets smaller. T/F? | True |
| How many single covalent bonds can carbon form? | 4 |
| What two conditions have to happen for a molecule to be polar? | Asymetrical Molecule,an Electronegativity difference between .4 and 1.7 |
Created by:
holmeskas
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