What does a number pyramid tell you about an ecosystem?

The biomass of each trophic level.

The number of organisms in each trophic level.

The lifespan of organisms in each trophic level.

The energy transfer between trophic levels.

What is going on inside atoms of a metal when a metallic salt of that metal is dissolved in water and then placed in a hot flame?

What is pressure? O A. The force of gas molecules hitting their container O B. The space occupied by gas molecules moving around O C. The heat required to change the temperature of a gas O D. The mixing of gas molecules due to random motion

1) If calcium were to combine with the compound barium nitrate, which member of the barium nitrate would calcium replace?

A 72.0-gram piece of metal at 96.0 °C is placed in 130.0 g of water in a calorimeter at 25.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal.

find the mass of 256 mL of mercury. The density of mercury is 13.56 g/cm cubed will mercury sink or float, explain

Which of the following is true about a redox reaction? In a redox reaction, an electron is lost by the reducing agent. In a redox reaction an electron is lost by the oxidizing agent.

Is the equation above balanced? How do you know? Mg + 2HCl → MgCl2 + H2

What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common?

Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent? A. Decreasing pressure B. Decreasing surface area C. Increasing rate of stirring D. Increasing temperature

Helium, neon, and argon are examples of A) metals B) metalloids C) noble gases D) transitional metals