8th Grade Science 2 Question Preview (ID: 39934)


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Which equation supports the Law of Conservation of Mass?
a) 2H + O yields HO
b) 2H + 2O yields 2HO
c) 2H + O yields 2HO
d)

If I reacted H and Cl to form HCl. What is/are the products?
a) HCl
b) H
c) Cl
d) H and Cl

If I reacted H and Cl to form HCl. What is/are the reactants?
a) HCl
b) H and Cl
c) H
d) Cl

If I reacted 2 g of H and 3 g of Cl to form HCl. How much HCl is produced?
a) 2 g
b) 5 g
c) 6 g
d) 3 g

Why do we balance equations?
a) Torture
b) Because of elements
c) Law of Conservation of Mass
d)

Mass is not created or destroyed
a) Law of Compounds
b) Law of Gravity
c) Law of Conservation of Mass
d)

What group of NONMETALS are the most reactive?
a) Alkaline Earth Metals
b) Alkali Metals
c) Halogens
d) Nobel gases

Where are the least reactive elements located at?
a) Alkali metals
b) Halogens
c) Nobel gases
d) Alkaline Earth Metals

Where are the most reactive elements located?
a) Group 1-Alkali Metals
b) Group 2-Alkaline Earth Metals
c) Halogens
d) Nobel gases

What element has properties similar to Lithium?
a) Cesium
b) Beryllium
c) Carbon
d) Calcium

What do the columns/groups/families tell you?
a) How many shells/orbitals
b) How many valence electrons
c)
d)

How many valence electrons does Chlorine have?
a) 3
b) 2
c) 7
d) 17

Elements on the left side of the periodic table
a) nonmetals
b) metals
c) metalloids
d)

Elements on the right side of the periodic table
a) Nonmetals
b) metals
c) metalloids
d)

Boron is
a) Metal
b) Metalloid
c) Non-metal
d)

I want to see if chewing gum increased test scores. What is the independent variable?
a) Students
b) Chewing gum
c) Test scores
d)

I want to see if chewing gum increased test scores. What is the dependent variable?
a) Test scores
b) Chewing gum
c) Students
d)

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