25.0 g of a substance requires 117.4 Joules of energy to raise its temperature from 75.0 to 87.2 oC. What is the specific heat of the substance?
.054 J/g°C

.063 J/g°C

2.60 J/g°C

.385 J/g°C

Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 77.0 g of gold? explain how you got your answer and the steps you took. you

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth