Matter And Changes: Question Preview (ID: 26865)


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The random molecular movement of a substance is at its greatest when the substance is
a) a gas b) frozen c) condensing d) a liquid
Solids have definite shape and volume. This is because
a) the molecules that make up a solid move freely around one another b) the molecules in solids stay in definite close location and vibrate c) the molecules in solids move past each other and flow d) the molecules in solids do not move at all
The random molecular motion of a substance is greatest when the substance is
a) gas b) liquid c) solid d) frozen
Solids have a definite shape and volume. This is because
a) the molecules in solids stay in a definite shape and vibrate b) the molecules in solids move past each other easily c) the molecules in solids do not move at all d) molecules in solids move freely in all directions
A balanced chemical equation reflects the idea that the mass of the products
a) equals the mass of the reactants b) is greater than the mass of the reactants c) is less than the mass of the reactants d) it is not related to the mass of the reactants
Sally is investigating physical and chemical changes using eggs, she did the following four actions: Boiled; Cracked; Fried; Scrambled. Which action describes a physical change?
a) boiled b) cracked c) fried d) scrambled
Which of the following represents a chemical reaction?
a) a cake baking in the oven b) a sugar cube dissolving in water c) ice cubes forming in a freezer d) ice cream melting in a bowl
Which action will result in a product with new chemical properties?
a) popping popcorn b) shredding a newspaper c) cutting wood d) breaking a mirror
Which is an example of a chemical reaction?
a) nails rusting b) sugar dissolving c) glass melting d) alcohol evaporating
Which of these is an example of a physical change?
a) melting ice b) baking cake c) rusting metal d) burning leaves
Roger combines vinegar with baking soda to demonstrate a chemical reaction. What should he be looking for to determine that a chemical reaction has occured?
a) formation of bubbles b) a reduction in total mass c) the disappearance of atoms d) a solid turning to a liquid
Which situation provides the best evidence that a chemical reaction is taking place?
a) A precipatant (solid) forming as two liquids are poured together into a beaker. b) A metal strip hammered into a flat sheet. c) A liquid freezing in the freezer to become a solid. d) A chemical completely dissolving in water and the temperature of the solution remains the same.
In making a stromboli sandwich, which process involves a chemical change?
a) mixing the spices for the sauce b) slicing pepperoni c) spreading cheese onto the sandwich d) baking the stromboli bread to form the crust of the sandwich
A pot on the stove containing water is heated. As the water boils the molecules -----
a) move faster and farther apart b) move slower and closer together c) get larger d) get smaller
Which of the following forms of energy is released or absorbed in most chemical reactions?
a) heat b) light c) sound d) electricity
Which of the following is a characteristic of all chemical changes?
a) A new material is formed b) A different state of matter is produced c) Some mass is converted to energy d) Some form of light is given off.
A child put a cup of kool-aid in the freezer to make it into a ice pop. This is an example of....
a) liquid changing to a solid b) liquid changing to a gas c) solid changing to a liquid d) gas changing to a liquid
Which of the following is an example of physcial change?
a) Liquid nitrogen exposed to air becomes nitrogen gas b) Iron exposed to air produces rust c) Sulfur combined with oxygen produces sulfur dioxide d) Hydrogen combined with oxygen forms water
Which statement correctly describes both gases and liquids?
a) Their shapes stay the same in any container b) Their shapes change when they are in different containers c) Their volumes stay the same in any container d) Their volumes change when they are in different containers.
Which of the following is an example of a chemical change?
a) cutting an apple into slices b) freezing water to make ice c) burning a candle d) melting a stick of butter
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