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Science chapter 2

Chapter 2

QuestionAnswer
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
 

 



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