The researchers already knew that any methanogens in the sample would consume hydrogen—but they did not know if the microbes could dissolve calcium carbonate to generate methane. To answer this ...

Choose a toothpaste with calcium carbonate or hydrogen peroxide if you want to whiten your teeth. Avoid toothpaste with ingredients like activated charcoal, which can damage enamel. Shopping for ...

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Finally, the hydroxide and hydrogen carbonate ions reacted with other ions dissolved in the seawater, such as calcium and magnesium. The solid minerals calcium carbonate and magnesium hydroxide ...

followed by selective removal of the calcium carbonate particles. Using it as a catalyst for electrochemical hydrogen ...

followed by selective removal of the calcium carbonate particles. Using it as a catalyst for electrochemical hydrogen peroxide production, experiments and calculations have shown that the curved ...