An unknown mass of aluminum requires 6290 joules to raise the temperature from 23.9 degrees Celsius to 80.0 degrees Celsius. What is the mass of the aluminum? The specific heat of aluminum is 0.900 J/g. °C

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

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.