Answer the following question given this paragraph: Saturated hydrocarbons are hydrocarbons that contain only single bonds between carbon atoms. As a result, each carbon atom is bonded to as many hydrogen atoms as possible. Q: What hydrocarbons contain only single bonds between carbon atoms? Choices: - caloric hydrocarbons - simple carbohydrates - unsaturated hydrocarbons - saturated hydrocarbons A:
saturated hydrocarbons
Answer the following question given this paragraph: Why does it snow instead of rain? Air temperature determines which type of precipitation falls. Rain falls if the air temperature is above freezing (0 C or 32 F). Frozen precipitation falls if the air or ground is below freezing. Frozen precipitation may fall as snow, sleet, or freezing rain. You can see how the different types form in Figure below . Q: What determines which type of precipitation falls? Choices: - air pressure - air currents - ground temperature - air temperature A:
air temperature
Q: Answer the following question given this paragraph: An experiment generally tests how one variable is affected by another. The affected variable is called the dependent variable . In the plant experiment shown in the Figure above , the dependent variable is plant growth. The variable that affects the dependent variable is called the independent variable . In the plant experiment, the independent variable is fertilizersome plants will get fertilizer, others will not. In any experiment, other factors that might affect the dependent variable must be controlled. In the plant experiment, what factors do you think should be controlled? ( Hint: What other factors might affect plant growth?). Q: In a scientific experiment, the variable that is affected by the other one is called what? Choices: - effective variable - essential variable - independent variable - dependent variable A:
A: dependent variable
Question: Answer the following question given this paragraph: Oceans are an important part of the water cycle. They absorb gases from the atmosphere. They evaporate and supply water vapor to the atmosphere. Q: Where do oceans absorb gases from? Choices: - stratosphere - wind - sunlight - atmosphere A:
Answer: atmosphere
*Question*
Answer the following question given this paragraph: While the great majority of the alpha particles did pass straight through the foil with no deflection, to everyone's surprise, some alpha particles were deflected. In fact, some alpha were bounced almost straight backward by the foil. Rutherford, using Coulomb's law and Newton's laws found that the results could be explained only if all the positive charge of the atom were concentrated in a tiny, central core, now called the nucleus . Rutherford's model of the atom is therefore, called the nuclear model of the atom. All of the positive charge and essentially all of the mass of the atom are in its nucleus. The atom is 10,000 times as large as the nucleus and is mostly empty space. It was known that electrons are outside the nucleus but how the electrons were arranged in an atom was still a mystery. Q: The nucleus is comprised primarily of? Choices: - energy - faith - matter - empty space A:
**Answer**
empty space
(Question)
Answer the following question given this paragraph: Pure Substances and Mixtures A pure chemical substance is any matter that has a fixed chemical composition and characteristic properties. Oxygen, for example, is a pure chemical substance that is a colorless, odorless gas at 25C. Very few samples of matter consist of pure substances; instead, most are mixtures, which are combinations of two or more pure substances in variable proportions in which the individual substances retain their identity. Air, tap water, milk, blue cheese, bread, and dirt are all mixtures. If all portions of a material are in the same state, have no visible boundaries, and are uniform throughout, then the material is homogeneous. Examples of homogeneous mixtures are the air we breathe. Q: What type of substance is any matter that has a fixed chemical composition and characteristic properties? Choices: - physical substance - versatile chemical substance - seawater chemical substance - pure chemical substance A:
(Answer)
pure chemical substance