If you live in Earth's northern hemisphere, on June 20th or 21st you experience summer solstice, which represents the official start of summer. This is the longest day of the year. What causes this change in day length?

Which of the following does a transverse wave have? A) compressions B) amplitude C) rarefactions D) ability to travel through space

A 100.00 ml of volume of 0.500 M HCl was mixed with 100.00 ml of 0.500 M KOH in a constant pressure calorimeter. The initial temperature of individual acid and base was 23.0 oC. The final temperature after mixing was 25.5 oC.

What is the reason for heat transfer from one substance to another?

In comparing the absorption spectra for chlorophyll a and chlorophyll b, which statement is most correct?

A substance contains 36.1 percent calcium and 63.9 percent chlorine by weight. what is the empirical formula of thegiven compound?

Write a net ionic equation for the reaction that occurs when barium sulfite (s) and excess hydrochloric acid (aq) are combined. Note: Sulfites follow the same solubility trends as sulfates.

A hydrate is a compound with water molecules incorporated into its crystal structure. In an experiment to find the percentage of water in the compound, the following data was recorded.

What do you get when you mix dog breeds such as a bulldog and a shih tzu?

How does temperature change with depth in the Earth's crust?

Which is the best metal to use in an alloy to increase its electrical conductivity? Aluminum (Al) Silver (Ag) Zinc (Zn) Antimony (sb)