7th Grade Life Science QBA2 2020-2021 Coppins, Kayleigh
13 of 3013 of 30 Items

Item 13
A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger. The student uses the dichotomous key to identify it. What arachnid has the student found?

Whip Scorpion
Whip Scorpion

Wind Scorpion
Wind Scorpion

Daddy Long Legs
Daddy Long Legs

Tick
Tick

Which statement describes james chadwick’s discovery.

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.)

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize