Which of the following statements describes characteristics of an endothermic reaction? Group of answer choices

∆H is negative, and the products have more potential energy than the reactants.

∆H is positive, and the products have less potential energy than the reactants.

∆H is positive, and the products have more potential energy than the reactants.

∆H is negative, and the products have less potential energy than the reactants.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Covalent compounds: mastery test select the correct answer what is formed when atoms join together with a covalent bond? a. an ion b. a molecule c. a neutral atom d. a noble gas

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.