Something breaking is a sign of what kind of change? a) physical only b) chemical only c) physical and chemical

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!