TRUE or FALSE 1. Technologists start with new materials and work out how to use them to design new things for a certain purpose.

2. A pen should be used to write the title and axes of a graph.

3. Predicting is making a general statement about what you expect to happen.

4. Corrosive chemicals will destroy living cells as well as other substances such as equipment used in the laboratory

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

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.)