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Science chapter 2
Chapter 2
| Question | Answer |
|---|---|
| True or False, every sample of a pure substance has exactly the same composition and the same properties. | true |
| what are the 2 categories of a pure substance? | Element and compound |
| what is an element? | An element has a fixed composition because it contains only one type of atom |
| True or false, the smallest particle of an element is an atom | True |
| Why does an element have a fixed, uniform composition? | An element has a fixed composition because it contains one type of an atom |
| what two elements is a gas at room temperature | Oxygen and Nitrogen |
| What is a compound | Always contains two or more elements joined in a fixed proportion |
| what are three things that are true about a compound? | A compund contains at least two elements The substances that make up a compound are always joined ion a fixed proportion A compound can be broken down into simpler substance |
| Why do the properties of a mixture vary? | The properties of a mixture can vary because composition of a mixture is not fixed |
| A ______ mixture is a mixture whose parts are noticeably different from one another | Heterogeneous |
| True or false, A homogeneous mixture is a mixture in which it is difficult to distinguish the substance from one another | True |
| A mixture can be classified as a solution, a suspension, or a collide based on the size of its ____ particles | Largest |
| What term identifies the homogeneous mixture that forms when sugar dissolves in a glass of hot water | solution |
| what is an example of a collide | Fog and homogenized milk |
| True or false, if salt water is poured through a filter, the salt will be trapped on the fillter | false |
| A physical property is any characteristic of a material that can be observed or measured without changing the ___ of the substance in the material | Composition |
| Explain why a wooden spoon is a better choice than a metal spoon for stirring a boiling pot of soup | the handle of a wooden spoon will stay coll because wood is not a good conductor of heat |
| True or false- A liquid with a high viscosity flows more slowly than a liquid with a low viscosity at the same temperature | True |
| True or False- Discovering which of two materials can scratch the other is a way to compare the hardness of the materials | True |
| The ability of a solid to be hammered without shattering | malleability |
| The temperature at which a substance changes from a liquid to a gas | boiling point |
| The resistance of a liquid to flowing | viscosity |
| The ability to allow heat to flow | conductivity |
| The ratio of the mass of a substance to its volume | density |
| The temperature at which a substance changes from a solid to a liquid | melting point |
| what are the three steps that can be used to identify a material | which properties to test, than test the sample, then compare the results with data reported for unknown material |
| True or False- Usually, people consider only one property when choosing a material. | False |
| Two processes that are commonly used to separate mixtures | Distillation and Filtration |
| True or False- In a physical change, some of the substances in a material change, but the properties of the materials stay the same. | false |
| What is a reversible physical change | Wrinkling shirt and freezing water |
| True or False- the substance in paraffin do not change when a candle burns | False |
| Compounds when water is formed when candle burns | water and Carbon |
| What is a chemical property | Chemical property is any property that produces a change in composition of matter |
| True or False- Flammability is a material's ability to burn in the presence of Carbon dioxide | False |
| The property that describes how readily a substance combines chemically with other substances is | reactivity |
| Property that is a chemical property | Flammability and reactivity |
| why isnt iron used to make coins? | Cause it is highly reactive in the presence of oxygen and water |
| what is the benefit of pumping nitrogen gas into seawater that is stored in steel tanks? | the nitrogen displaces dissolved in oxygen from the seawater, reducing the amount of rust that forms inside the tanks |
| A ___ change that occurs when a substance reacts and forms one or more new substances. | Chemical |
| What are three examples of chemical change | Cake baking, leaves on a tree changing, food being digested |
| What are evidences of a chemical change | A change in color, a filter trapping particles, and the formation of a solid precipitate |
| True or False- When iron is heated until it turns red, the color change shows that a chemical change has taken place | false |
| When matter undergoes a chemical change, the composition of the matter ___ | changes |
| When matter undergoes physical change, the composition of the matter | stays the same |
| The ability to be hammered without shattering is called | Malleability |
| The ability to carry electricity or heat is called | conductivity |
| A physical property is one which can be observed without | changing the substances composition |
| distillation is the process of separating substances using the property of | boiling point |
| Some substances float on water and others sink because of this physical property | density |
| Copper is a good substance for use in electrical circuits because these properties | Conductivity and ductibility |
| Gold is often chosen for jewelry because of its | luster |
| If an atom was blown up to the size of a football field, what would the size of the nucleus be? | it be the size of a grain of sand or the ball of a pen |
| A physical property that can be hit without breaking? | malleability |
| What are the three things that are taking place during a chemical change | Color, Gas, and precipitation |
| The denisty is what divided by what | Mass/Volume |
| The main way to separating things is using.. | Distillation and Fillteration |
| Fog is an example of | Colide |
Created by:
Andrew Loffredo