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Science 8 th Grade Chemical Interactions
100 200 400 300 400 Choice1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100
Row 1, Col 1 Each family in the periodic table has its own characteristic properties based on the number of ____________ or _________. Valence electrons or protons
1,2 The attraction between similarly charged ions is called an ___________ bond. ionic
1,3 When 2 atoms share electrons it’s called a ___________ bond. covalent
1,4 The principle of conservation of mass states ___________. Matter can not be created or destroyed.
2,1 Ions that are made of more than one atom are called__________. Polyatomic ions
2,2 A covalent bond in which electrons are shared unequally is called _____________. polar
2,3 Which particles of an atom are in the nucleus? Protons and neutrons
2,4 In water, bases make ________. Hydroxide ions
3,1 The electrons that bond between atoms are called_____________. Valence electrons
3,2 The pH scale measures________. Concentration of hydrogen ions
3,3 What happens when chemical bonds break and forms new bonds? Chemical reaction
3,4 A chemical reaction will always show a ________________. New substance
4,1 Neutralization is a reaction between an_____________and a ________. Acid, base
4,2 The substances on the left side of a chemical equation are called the ______________. reactants
4,3 A chemical reaction that absorbs heat energy is _________________ endothermic
4,4 A neutralization reaction will make __________ and a _________. Water and a salt
5,1 The number in front of a chemical formula and the number below an element’s symbol are called___________ and _______. Coefficient and subscript
5,2 The minimum amount of energy needed to start a reaction is called the _______________ Activation energy
5,3 In a water solution, how are acids and bases different? Acids form hydrogen ions/bases hydroxide ions
5,4 What happens when an atom loses an electron? It becomes a positive ion
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