How much heat is required to raise the temperature of 0.25 kg of water from 35 C to 80 C?

Can a physical change, change what a substance is? Explain your answer by giving an example.

Which organism uses photosynthesis

The sun rose at 6:54 this morning. is this an observation or inference?

Who was the man that proposed the uncertainty principle

The Earth moving round the Sun in a circular orbit is acted upon by a force, and hence work must be done on the Earth by this force. Do you agree with this statement?

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?