Ice melting is a physical change because ice does not change its properties
100
What is the chemical formal
H2O2
100
what is an atom
smallest particle of an element;the building block of matter
100
what is a chemical reaction
the process in which the physical and chemical properties of substances are changed into different substances that have their own physical and chemical properties
100
Which of the following correctly compares the elements on the right side of the periodic table with the elements on the left side of the periodic table?
B
200
Reactants
Food eaten
the saliva in your mouth
Stomach acid
200
How many hydrogen and carbon atoms are in a molecule of properties
8 hydrogen atoms and 3 carbon atoms
200
what is the atomic number
the number of protons in an atoms nucleus
200
what is a compound
a chemical substance that is made up of two or more different kinds of atoms that are bonded together
200
Which of the following is a property of fluorine(F), a nonmetal?
B
300
Products
anything that your body produces from chemically altering the food
300
How many hydrogen and oxygen atoms exists before the reaction
8 hydrogen atoms and 4 oxygen atoms
300
what is a chemical change
a reaction between substances that results in new substances with different chemical properties being formed
300
what is concentration
the relative amount of a material in a given area,volume or other substance
300
Which element is least likely to combine with another to form a molecule
C
400
Is the chemical reaction in such a packet endothermic or exothermic
Endothermic because it absorbs heat. If you put the pack on your skin it will pull heat energy from your body and feel cold.
400
How many hydrogen and oxygen atims exist after the reaction
8 hyrdrogen atoms and 4 oxygen atoms
400
what is the chemical formula
letters and numbers that tell the types and numbers of atoms in a single molecule
400
what is conservation of matter
the physical law stating that matter cannot be created or destroyed in chemical reactions;thus, the number of particles before and after a reaction is equal
400
Which of the following could be the amounts of X and Y in the reaction?
A
500
Explain why this is not true, and describe where the matter goes
The fuel is converted into gas which is escaped into the atmosphere
500
What four elements have chemical properties most similar to those of fluorine in column VII A?
Silver,phosphorus,lithium,tellurium,iodine
500
what is a chemical property
the characteristics of a substance that describes what will happen when it interacts with other substances
500
what is an element
a substance that cannot be broken down by simple chemical and physical processes
500
Which of the following is an example of a chemical change?