Density = mass/volume = 2000/4000 = 0.5 grams/cm3. Hope this hopes!
Answer:
This would be the hydride ion where H gains an electron from a metal such as Na
Explanation:
Answer:
Exothermic reactions feel hot
Endothermic reactions feel cool
Explanation:
In an exothermic reaction, heat is given out by the system. The energy of the reactants is greater than that of the products hence the excess energy is given off as heat. The reaction vessel feels hot.
In an endothermic reaction, the energy of products is greater than that of the reactants hence energy is taken into the system and the reaction vessel feels cool.
The answer is B but iam not sure about the answer
