Manganese dioxide (mno2(s), hf = –520. 0 kj) reacts with aluminum to form aluminum oxide (ai2o3(s), hf = –1699. 8 kj/mol) and manganese according to the equation below. What is the enthalpy of the reaction? use. –1,839. 6 kj –1,179. 8 kj 1,179. 8 kj 1,839. 6 kj.

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.

Which of the following does the reading test of the sat ask you to do ?

Acheetah ran 75 meters at a speed of 25 meters per second. how long was the cheetah running? 3 seconds 5 seconds 30 seconds 50 seconds