Properties of Matter
Mass is a(n) ______ property.
physical
The total mass before a chemical reaction is the same as the total mass after the reaction describes which law?
Law of conservation of mass
Endothermic reactions absorb _______ energy than they release.
more
Burning paper is an example of ______.
a chemical change.
Respiration is a chemical process that takes place inside the cells of all living organisms. Respiration, an example of a(n) ________ reaction, releases energy for the organism to use to stay alive.
an exothermic reaction
A substance's ________ properties predict how it will react with other substances.
chemical
The mass of a water molecule is equal to the mass of which type of atoms?
Two hydrogen atoms (H2) and one oxygen atom (O)
A change in temperature is a sign of energy being used in a ________.
chemical reaction
Mass is an example of a ______ property.
physical
You give the side-eye to some kid in your new HS's science class when they ask the teacher, "... respiration is an exothermic reaction and not an endothermic reaction, correct?" You, on the other hand, having been appropriately educated in 7th grade science, conclude in your mind that the kid is ______.
Correct
Mass per unit volume of a substance will gives you this.
density
The number of molecules in reactants _______ always equal the number of molecules in products
Does Not
A chemical reaction in which more energy is released than is absorbed is endothermic.
False
A substance's ________ properties predict how it will react with other substances.
chemical
You're asked to identify what type of reaction occurs when the results show that the inwardly direction of energy is greater than the outwardly direction of energy in a science experiment where you split a gas molecule. You identify it as a(n) _______
endothermic reaction
Classifying matter based on chemical properties is ____.
False
This 'two' specifically balances the following equation: 2H₂ + O₂ → 2H₂O
the 'coefficient' 2 in front of 2H2 in the product
A chemical bond _____ energy when it breaks.
Absorbs
Mass per unit volume of a substance gives you the what?.
Density
One kid sitting alone on a seesaw is joined by another kid of equal mass, resulting in the seesaw being parallel to the ground beneath it. The second kid is equivalent to which vocabulary word?
Coefficient
______ is the amount of matter in an object. Weight is the ______ on the mass of an object.
Mass, gravitational pull
Exothermic reactions _____ more energy than they _____.
release...absorb
Although you applied for the cashier position at McDonald's, the manager makes you second in command when you explain, during your interview, that the reason why it is a good idea to put an insulating lid onto the polystyrene coffee cups is because what?
Prevents heat from escaping out of the cup during an exothermic reaction, and prevents heat from entering the cup in an endothermic reaction.