C- row 2, colun II. Write "T" if the statement is true, and “F” if it is false,
Change the underlined word(s) to make the statement
true.
1. In the periodic table as suggested by Mendeleev, elements were
arranged in the order of increasing atomic number.
2. Sodium (Z=11) is a member of a group called alkaline earth
metals.
3. Elements to the extreme right of the periodic table are metals.
4. Metalloids have properties of metals and non-metals.

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

What’s the theoretical yield of solid lead