Hydrogen gas is produced when zinc reacts with hydrochloric acid. if the actual yield of this reaction is 85%?
how many grams of zinc are needed to produce 112 l of h2 at stp?

a. 95 g
b. 180
c. 280
d. 380

Janel’s class studied properties of matter and how matter can change. janel decided she would do an experiment mixing baking soda and vinegar. question: describe the properties of baking soda and vinegar, and explain the changes that janel should see when she mixes the two types of matter. •first, identify the physical state of matter of baking soda. describe another property of baking soda. •next, identify the physical state of matter of vinegar. describe another property of vinegar. •then, explain what janel should see when she mixes the baking soda and vinegar. •describe the states of matter of the new materials that are formed. •explain how janel can be certain a change has occurred. me

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?