In which of these reactions is energy released

3) prove that the composition of soda (sodium bicarbonate) is 27.4% sodium 1.2% hydrogen 14.3% carbon 57.1% oxygen

Scientists hypothesize that early whale ancestors were amphibious. Which statement below is most consistent with this hypothesis? The fossil animals

What are some reasons why Scientists predict that Niagara Falls will be gone is 50,000 years?

No pure elements are liquids at room temperature.

The atomic mass of an element is calculated using the (1) atomic number and the ratios of its naturally occurring isotopes (2) atomic number and the half-lives of each of its isotopes (3) masses and the ratios of its naturally occurring isotopes (4)

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?

What kind of chemical bond does salt have?

How does phosphorus enter the human body?