What function is most important the heart or the brain

Which of the following chemical reactions will produce a precipitate?

Select all that apply. choose the two correct statements below. the elements of the halogen family are very reactive because: they readily lose one valence electron. they require only one electron to complete their outer shell.

An unknown radioactive substance has a half-life of 3.20hours. If 46.2g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units. Americium-241 is used in some smoke detectors.

An electron is in a region outside the nucleus. An electron a) Is larger than a proton and has no charge b) Has less mass than a proton and has a negative charge c) Is smaller than a proton and has no charge d) Has a positive charge

A plant that requires more light than darkness in order to grow A. Stimulus B. Tropism C. Long-day plant D. Short-day plant

Why does the sun appear to be the brightest star in the sky? A - Its apparent brightness is much greater than other stars. B - It burns more gas, making it brighter than any other star.

What effect does nuclear radiation have on atoms? It splits atoms. It burns atoms. It ionizes atoms.

The density of an aqueous solution of nitric acid is 1.36 g/ml and the concentration is 2.48 m. what is the concentration of this solution in percent by mass?

In a crystal lattice of an ionic compound, A. Kind of a given charge are clustered together B. Ions are surrounded by ions of the opposite charge C. A sea of electrons surrounds the ions D. Neutral molecules are present

Discuss why two objects of made of the same type of matter at the same starting temperature with different masses increase in temperature at different rates when the same amount of thermal energy is transferred to each object.