Answer the following question given this paragraph: In our calculation, we have ignored the reaction of the weakly basic anion with water, which tends to make the actual solubility of many salts greater than the calculated value. Exercise One crystalline form of calcium carbonate (CaCO3) is the mineral sold as "calcite" in mineral and gem shops. The solubility of calcite in water is 0.67 mg/100 mL. Calculate its Ksp. Answer: 4.5 109. Q: One crystalline form of calcium carbonate is the mineral sold as what? Choices: - quartz - basalt - salt - calcite A:
calcite
(Question)
Answer the following question given this paragraph: Hydrocarbons are compounds that contain only carbon and hydrogen. Hydrocarbons are the simplest type of carbon-based compounds. Nonetheless, they can vary greatly in size. The smallest hydrocarbons have just one or two carbon atoms, but large hydrocarbons may have hundreds. The size of hydrocarbon molecules influences their properties. For example, it influences their boiling and melting points. As a result, some hydrocarbons are gases at room temperature, while others are liquids or solids. Hydrocarbons are generally nonpolar and do not dissolve in water. In fact, they tend to repel water. That's why they are used in floor wax and similar products. Q: What is the simplest type of carbon-based compounds? Choices: - Buckminsterfullerine - graphite - particles - hydrocarbons A:
(Answer)
hydrocarbons
Ques: Answer the following question given this paragraph: Changes to the nucleus of an atom require tremendous amounts of energy, so protons are not easily gained or lost by atoms. Electrons, on the other hand, are held fairly loosely and can often be removed quite easily. When an object loses some electrons, the remaining object is now positively charged because it has an excess of protons. The electrons may either remain free or may attach to another object. In that case, the extra electrons cause that object to become negatively charged. Atoms that have lost electrons and become positively charged are called positive ions, and atoms that have gained electrons and become negatively charged are called negative ions . Q: Atoms that have gained electrons and become negatively charged are called what? Choices: - negative atoms - cations - anions - negative ions A:
Ans: negative ions
(Q).
Answer the following question given this paragraph: The last major ice age took place in the Pleistocene. This epoch lasted from 2 million to 14,000 years ago. Earth's temperature was only 5 C (9 F) cooler than it is today. But glaciers covered much of the Northern Hemisphere. In Figure below , you can see how far south they went. Clearly, a small change in temperature can have a big impact on the planet. Humans lived during this ice age. Q: The last major ice age took place in which era? Choices: - miocene - pliocene - cenozoic - pleistocene A:
(A).
pleistocene
Ques:Answer the following question given this paragraph: Neural Stimuli In some cases, the nervous system directly stimulates endocrine glands to release hormones, which is referred to as neural stimuli. Recall that in a short-term stress response, the hormones epinephrine and norepinephrine are important for. Q: In some cases, the nervous system directly stimulates endocrine glands to release hormones, which is referred to as what? Choices: - brain stimuli - active stimuli - functional stimuli - neural stimuli A:

Ans:neural stimuli
Answer the following question given this paragraph: A machine is any device that makes work easier by changing a force. Work is done whenever a force moves an object over a distance. The amount of work done is represented by the equation:. Q: What do you call any device that makes work easier by changing a force? Choices: - technology - invention - battery - machine A:
machine