True or false? social sciences incluse biology and chemistry

Water ice has the chemical formula H2O (s). A block of ice melts to become liquid water, H2O (l). This change can be represented as: H2O (s) → H2O (l) Is this representation a chemical reaction? Why or why not? 1.

Boron is a metalloid. How many valence electrons does boron have? A. 6 B. 3 C. 5 D. 4

What is the solubility in moles/liter for magnesium hydroxide at 25 oC given a Ksp value of 1.1 x 10-11. Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!)

Which is not an example of a vestigial structure

What is the difference between a mixture & a pure substance?

Explain two reasons why we can conclude that the rise of the water in the glass tube is due to root pressure and not transpiration or capillarity

Four type of molecular models

How many particles are in 1 mol of carbon? 1 mol of lithium? 1 mol of eggs? will 1 mol of each of these substances have the same mass?

An organic chemist plans for the synthesis of a complex organic molecule by

Which societal problem can be solved in part by scientist identifying areas of high biodiversity