3. Classify the chemical reaction shown here: Mg + H2SO4 + MgSO4 + H2
A. Combination
B. Single replacement
C. Decomposition
D. Double replacement

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.