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one example of changing a substance chemically is
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Chapter 1 Science
| Question | Answer |
|---|---|
| one example of changing a substance physically is... | blending a milkshake |
| one example of changing a substance chemically is | burning wood |
| characteristic property that can help similar liquids apart is | boiling point |
| why might you need to study at least two or three characteristics before you can accurately identify a substance | many substances share meting points, boiling points, or other characteristic properties |
| sugar and salt are examples of | pure substance |
| substances that CANNOT be broken chemically into other substances are | elements |
| the measurement of the force of gravity on an object is the object's | weight |
| the measurement of how much matter an object contains is its | mass |
| the density of a block of wood with a volume of 50 cubic cm and a mass of 100 grams is | 2 g/cm3 |
| all elements are composed of extremely small particles called | atoms |
| the first person who came up with the idea of atoms was | Democritus |
| according to Dalton's theory of atoms, all atoms in the same element | are exactly alike |
| what did Dalton's theory of atoms say about compounds | atoms of two or more elements can combine to form compounds |
| a group of atoms that are joined together and act as a single unit is called a | molecule |
| what holds atom together in a molecule | chemical bonds |
| why can gold be separated easily from surrounding material | it has a high density |
| what technique did miners use to separate gold from sand and dirt | panning |
| copper can be separated from surrounding material because of its | chemical activity |
| in nature copper usually exists as a | compound mixed with other material |
| how would you calculate the density of an object | m/v |
| SI unit for mass is the | kilogram |
| pure substances formed from chemical combinations of two or more different elements are called | compounds |
| which type of matter consists of two or more substances that are not chemically combined | mixtures |
| how do liquid water, ice, and water vapor differ | they are different states of matter |
| which statement was not part of Dalton's theory of atoms? | all atoms are alike |
| Dalton's theory of atoms said that the masses of elements in a compound are always | in a constant ratio |
| electric current breaks the chemical bond that joins a metal and other elements in an ore in a process called | electrolysis |
| iron can be seperated from the oxygen in its ore by | by heating the ore in a hot, charcoal fire |
| statment part of Dalton's theory of atoms? | atoms of each element have a unique mass |
| a change that produces one or more new substances is called | chemical change |
| the ____ point of water is 100'C | boiling |
| a _____ substance is made of only one kind of matter and has definite properties | pure |
| an objects ___ is a measure of the force of gravity acting on the object. | weight |
| the density of a material is expressed as ____ | m/v |
| smallest particle of an element is called an ___ | atom |
| in the early 1800s, John Dalton proposed a theory including the idea that atoms ____ be broken apart | cannot |
| a ___ can contain just a few atoms or as many as a billion atoms | molecule |
| ____ is a Characteristic property that enables miners to distinguish between real gold and "fools gold", or pyrite | density |
| in blast furnaces, iron metal separates from its ore because oxygen in the ore reacts with ___ | carbon |
| the burning of wood is an example of ___ | chemical change |
| characteristic temperatures at which a pure solid changes to a liquid is its ____ | melting point |
| a ____ is formed when two or more or more substances mix together so well that they appear to be a single substance | solution |
| mass is the measure of the total amount of ____ in any object | matter |
| the units liter, milliliter, and cubic centimeters are all used to measure the ___ of an object or substance | volume |
| one of the first person known to develop the idea of atoms was the ancient Greek philosopher ____ | Democritus |
| John Dalton said that the masses of the _____ in a compound are always in a constant ratio | elements |
| A ____ is a group of atoms that are bonded together and act as a single unit | molecule |
| If you slowly pour out a mixture of metallic gold, dirt, and water, the gold will sink and remain behind because of its high ____ | density |
| Usually a ___ change is needed to release iron from the ore in which it is founf | chemical |
| Dissolving a spoonful of sugar in tea or coffee is an example of a ___ change | physical |
| boiling point and melting point are two ___ properties, which remains the same for any sample of a substance | characteristic |
| A ___ is a pure substance formed from two or more elements | compound |
| Two objects that have the same ___ will have the same weight when they experience the gravitational force of the same planet. | mass |
| The unit used to measure density is a unit of mass divided by a unit of ___ | volume |
| According to Dalton's theory about matter, the ____ of the same element are exactly alike | atoms |
| A _____ is a force that holds the atoms in a molecule together | chemical bond |
| the metallic element ____ has a high density that causes it to separate from other materials during the panning process. | gold |
| Metallic copper can be separated from its compounds by an electric current during the process called ___ | electrolysis |
| the smallest possible molecule is made of two ____ held together by a chemical bond | atoms |
| How do you find the increment on a graduate/thermometer/beaker | difference between two numbers divided by number of lines between numbers |
| When deciding where things belong in the beaker it goes from what to what | least dense to most dense |
| looks uniform | Homogeneous |
| you can see the individual parts | Heterogenous |
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16asantiago