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Questions in chemistry

[Done] What conditions must be met in order for a reaction to be considered exothermic?

[Done] The gram formula weight of phosphoric acid is 98.00 g/mol, and the density of 85.0% phosphoric acid is 1.685 g/mL. Could you describe how...

[Done] What is the molecular formula of a compound made of 25.9% N and 74.1% O? a. NO b. NO₂ c. N₂O d. N₂O₅ e. N₂O₄

[Done] 1.133 g of silver nitrate was heated in an open tube. The silver residue weighed 0.720 g. During the reaction, 0.307 g of nitrogen dioxide was also produced. The rest of the mass loss was due to oxygen. Use the data to write the equation for the reaction.

[Done] As the electric current in a lightbulb is slowly increased, the filament glows more and more brightly. Why does this happen?

[Done] Which compound would most likely turn litmus paper to a red color? a. CH₃CH₂CH₂OH b. CH₃CH(Br)CH(Br)CH₃ c. CH₃CH₂CH(Br)CH₃ d. CH₃CH₂CH₂COOH e. CH₃CH₂CH₂CH₃

[Done] Which term is used for the tendency of an object to resist a change in its motion? A. acceleration B. displacement C. momentum D. inertia

[Done] When the Moon moves between the Sun and Earth and casts a shadow on Earth's surface, there is a(n): a. lunar eclipse b. full Moon c. new Moon d. solar eclipse

[Done] List three everyday things that exist or occur because of science. Make sure you use examples.

[Done] The vertical sequence of the layers of soil is called a soil ____?