How to figure out if a reaction is exothermic or endothermic?

How can an experiment support or fail support a hypothesis

What is the oxidation number assigned to magnesium in KMnO4?

Complete and balance the following reactions ca+H

Scientific explanations of natural phenomena are based on A. opinion polls of scientists. B. only the observations made by a single scientist. C. only the most recent empirical evidence. D. all the empirical evidence available.

For real gases, how does a change in pressure affect the ratio of PV to nRT? a. The ratio decreases as pressure increases. b. The ratio increases as pressure increases. c. The ratio is constant at all pressures.

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?