Natural Science Quizzes Online & Trivia

At my school we learned that it is a controlled variable

1. neptune-plutos orbit is quite eccentric, and at its perihelion (closest approach to the sun) pluto is simply closer than neptune to the sun. for ten years before perihelion and ten years after, plutos orbit moves inside neptunes to make it the eighth planet from the sun. plutos period of revolution is 248 years, so it is actually the farthest planet from the sun for more than 90 percent of its orbit. plutos last perihelion occurred in 1989; this means that it became the eighth planet from the sun in 1979, and it retained this title until 1999.

1. isomers-for example, glucose and fructose are two common monosaccharides that have the same empirical and molecular formulaschobut different structural formulas. that is, they are both composed of the same number of atoms of the same three elements, but the arrangement of those atoms in space differs between the two compounds, and this accounts for their chemical differences. especially with organic compounds, how the atoms are arranged in the molecule is as important as what elements are present.

1. baco₃-the first answer simply restates the molar ratios and is not in an acceptable form as a formula. the common method is to divide each molar ratio by the smallest of the numbers in the list of molar ratios. in simple problems like this, it is easier to multiply the molar ratios by 2, 3, 4, etc., until results close to whole numbers are obtained. this is especially true if the work must be done without a calculator. in this instance, doubling the molar ratios gives new ratios of 1.08 : 1.16 : 3.04, which is very close to 1: 1 : 3. it is also the smallest ratio of whole numbers that will workanother important point.

Sea urchins and brittle stars.Grasshoppers and butterflies are insects, spiders are arachnids, while clams and mussels are mollusks. Sea urchins and brittle stars are echinoderms (characterized by plates or spines in their body wall), as is the common sea star (starfish).

HomeostasisHomeostasis is a concept that is central to any understanding of physiology. Homeothermy is a superficially similar word, but as the -thermy ending suggests, it refers to body temperaturein this instance, the active maintenance of a steady body temperature.

500m before the net The vertical and horizontal motions are independent. First, use height = (1/2)gt2 to find the time required for the package to fall to the ground: t = 5s. Then, multiply by the speed of the airplane to find the horizontal distance the package will travel before hitting the ground: 100 5 = 500m.

The bottle and the toy hit the ground at the same time. Vertical and horizontal motion are independent. Both objects take the same amount of time to fall.

Eight years You can find this by using Keplers third law, which states that the square of the period of revolution in years is proportional to the cube of the average distance between the sun and planet in Astronomical Units.