Questions in Grade High-school

Questions in Grade High-school

[Homework Help] The oxygen content in the atmosphere of early Earth is thought to have increased significantly once which of these developed?

[Homework Help] Calculate the number of moles for each of the following substances: 1. 3.16 g of KMnO₄ 2. 32.33 g of K₂CrO₄ 3. 100 g of KHCO₃

[Homework Help] Is wind energy renewable, nonrenewable, or inexhaustible?

[Homework Help] A chunk of silver has a heat capacity of 42.8 J/°C. If the silver has a mass of 181 g, calculate the specific heat of silver.

[Homework Help] An oil tank has a capacity of 45 gallons. At the beginning of October, it is 80% full. At the end of October, it is \(\frac{1}{3}\) full. How many gallons of oil were used in October?

[Homework Help] Sian bought a TV in the January sales, which had been reduced by 20%.

[Homework Help] A 12-gallon tub has a faucet that lets water in at a rate of 3 gallons per minute and a drain that lets water out at a rate of 1.5 gallons per minute. If you start with 3 gallons of water in the tub, how long will it take to fill the tub completely?

[Homework Help] Calculate the average speed (in km/h) of a car stuck in traffic that drives 12 kilometers in 2 hours.

[Homework Help] Scientists can use genetic information to identify people because it is unique to each person. Which specific characteristic is unique to an individual?

[Homework Help] If a man travels \( p \) hours at an average rate of \( q \) miles per hour, and then \( r \) hours at an average rate of \( s \) miles per hour, what is his overall average rate of speed?