Unit 1 Mod 2 Lessons 2-3 Question Preview (ID: 54628)
Property Changes In Chemical Reactions
Energy Changes In Chemical Reactions.
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_____________chemical bonds requires energy
a) breaking
b) forming
c) bending
d) jumping
The number in front of the element symbol or chemical formula. For example, the two in 2(CO)
a) superscript
b) coefficient
c) subscript
d) variable
The _________energy particles have, the more they move and ___________ with each other.
a) less, collide
b) less, cool
c) more, collide
d) more, cool
These describe the number of atoms of an element in a compound
a) superscript
b) coeffiecient
c) subscript
d) variable
In a chemical equation, these are to the left of the arrow.
a) products
b) reactants
c) equals sign
d) solids
In a chemical equation, these are to the right of the arrow
a) products
b) reactants
c) equals sign
d) solids
Which scientist discovered the law of conservation of mass?
a) Isaac Newton
b) Antoine Lavoisier
c) Jacques Charles
d) Robert Boyle
When exposure to water and the atmosphere changes the composition of rocks and minerals, this is called
a) chemical weathering
b) physical weathering
c) erosion
d) decomposition
When leaves change color in the fall, this is an example of a __________change
a) wardrobe
b) state of matter
c) physical
d) chemical
Which of the following is NOT an indication of a chemical change?
a) When baking soda and vinegar are mixed, gas bubbles form.
b) Accidentally leaving a popsicle on the counter and finding a puddle instead of the popsicle
c) Mixing rock salt with ice in an ice cream maker to lower the temperature
d) Mrs. Landreth breaking a glow stick so she can see in the dark
If Ava dyes a t-shirt, this is a
a) physical change
b) chemical change
c) wardrobe change
d) chemical and physical change
A chemical change occurs when matter changes into other substances with
a) different physical properties
b) is used in an experiment
c) different chemical properties
d) different chemical and physical properties
_____________chemical bonds releases energy
a) breaking
b) forming
c) bending
d) jumping
In a ________________chemical reaction, MORE energy is required on the reactants side than is released on the products side
a) exoskeletal
b) elemental
c) exothermic
d) endothermic
In a ________________chemical reaction, LESS energy is required on the reactants side than is released on the products side
a) exoskeletal
b) elemental
c) exothermic
d) endothermic
Which of the following is an example fo an endothermic reaction?
a) cooking a pizza
b) a bonfire
c) using HOT HANDS to warm your hands when hunting
d) burning a candle
The ____________________________ states that even though energy is always transferring, energy is not created or destroyed.
a) Law of Conservation of Mass
b) Law of Conservation of Energy
c) Law of Conservation of Coffee
d) Landreth's Law of the Land
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