Answer the following question given this paragraph: Other applications of carbonates include glass makingwhere carbonate ions serve as a source of oxide ionsand synthesis of oxides. Hydrogen carbonates are amphoteric because they act as both weak acids and weak bases. Hydrogen carbonate ions act as acids and react with solutions of soluble hydroxides to form a carbonate and water: KHCO 3(aq) + KOH(aq) K 2 CO 3(aq) + H 2 O(l) With acids, hydrogen carbonates form a salt, carbon dioxide, and water. Baking soda (bicarbonate of soda or sodium bicarbonate) is sodium hydrogen carbonate. Baking powder contains baking soda and a solid acid such as potassium hydrogen tartrate (cream of tartar), KHC4H4O6. As long as the powder is dry, no reaction occurs; immediately after the addition of water, the acid reacts with the hydrogen carbonate ions to form carbon dioxide: HC 4 H 4 O 6 (aq) + HCO 3 (aq) C 4 H 4 O 6 2(aq) + CO 2(g) + H 2 O(l) Dough will trap the carbon dioxide, causing it to expand during baking, producing the characteristic texture of baked goods. Q: Substances that act as both weak acids and bases are said to be what? Choices: - amphiphilic - hygroscopic - atmospheric - amphoteric A:
amphoteric
(Question)
Answer the following question given this paragraph: In this image, you see small pools of elemental mercury. The Latin name for mercury is hydrargyrum, a compound word meaning "water-silver" (hydr- = water, -argyros = silver), since it is liquid like water but shiny like silver. Mercury is the only pure metal that exists as a liquid at room temperature. Q: What is the latin name for mercury? Choices: - trichina - stibium - spirogyra - hydrargyrum A:
(Answer)
hydrargyrum
Ques: Answer the following question given this paragraph: Q: What are the food making factories of plants? Choices: - stems - fruits - roots - leaves A:
Ans: leaves
(Q).
Answer the following question given this paragraph: Community Dynamics Community dynamics are the changes in community structure and composition over time, often following environmental disturbances such as volcanoes, earthquakes, storms, fires, and climate change. Communities with a relatively constant number of species are said to be at equilibrium. The equilibrium is dynamic with species identities and relationships changing over time, but maintaining relatively constant numbers. Following a disturbance, the community may or may not return to the equilibrium state. Succession describes the sequential appearance and disappearance of species in a community over time after a severe disturbance. In primary succession, newly exposed or newly formed rock is colonized by living organisms; in secondary succession, a part of an ecosystem is disturbed and remnants of the previous community remain. In both cases, there is a sequential change in species until a more or less permanent community develops. Primary Succession and Pioneer Species Primary succession occurs when new land is formed, for example, following the eruption of volcanoes, such as those on the Big Island of Hawaii. As lava flows into the ocean, new land is continually being formed. On the Big Island, approximately 32 acres of land is added to it its size each year. Weathering and other natural forces break down the rock enough for the. Q: What term describes the sequential appearance and disappearance of species in a community over time after a severe disturbance? Choices: - supression - generational replacement - pattern - succession A:
(A).
succession
Ques:Answer the following question given this paragraph: How fast or slow something moves is its speed . Speed determines how far something travels in a given amount of time. The SI unit for speed is meters per second (m/s). Speed may be constant, but often it varies from moment to moment. Q: What unit of measurement determines how far something travels in a given amount of time? Choices: - distance - volume - density - speed A:

Ans:speed
Answer the following question given this paragraph: We see many objects out in space that emit light. We see other objects that emit other types of electromagnetic radiation. The matter we can see is contained in stars. The stars are contained in galaxies. Scientists think that stars and galaxies make up only a small part of the matter in the Universe. The rest of the matter is called dark matter . Q: What is the area of our universe that isn't stars and galaxies called? Choices: - nebula - solar systems - galaxies - dark matter A:
dark matter