1. What is one of the oldest tests in a chemist’s toolbox? 2. Each element essentially has its own when viewed through the new device
making use of a prism called a .
3. This element was first found on the sun because of the use of the spectroscope.
4. is credited for bringing order to the unruly nature of all the known elements at the time.
5. At the end of the 1860”s how many different scientists detected a hidden order to the elements?
6. What was the publication date of Mendeleev’s first two chapters of his second volume?
7. Mendeleev likens the problem of the elements to his favorite card game called .
8. What two elements crystallized Mendeleev’s thinking about the order which alluded him?
and
9. Mendeleev not only left blanks in his periodic table, but also suggested for
those elements.
10. “The laws of nature to do not permit .

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

Need asap ! what is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

According to newton’s first law of motion, which force is expected to cause a body to accelerate?