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What happens during a physical change?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
Which is always true of a balanced chemical equation?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
Which is a clue that a chemical change has occurred?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
According to the law of conservation of mass, which of the following is a true statement about any chemical reactions?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
Which of these is a physical change?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
A physical change is taking place when
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
According to the law of conservation of mass, which of these statements is true?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
Which of the following would cause a chemical change in a piece of wood?
onions are chopped
burning the wood
A beaker becomes warmer when you mix two room-temperature liquids in it
A property of the substance changes, but its identity stays the same
The total mass of the reactants equals the total mass of the products
melting
The mass of the reactants in a chemical reaction equals the mass of the products
Both sides of the equation contain the same elements and the same number of atoms
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