True or False? Atmospheric oxygen increased after the evolution of photosynthetic prokaryotes.

Which of these statement is conclusive evidence that mixing sugar in water is a physical change? A). there is no change in color B). there is no precipitate formed. C). there is no gas given off. D). there is no molecular change.

Tectonic plates make up which of the following layers of the Earth?

Which compound is formed from a network of bonded ions? A) sugar, C12H22O11 B) water, H2O C) methane, CH4 D) salt, NaCl

Basic substances have a gritty texture. TRUE FALSE A substance is added to pure water and the concentration of aqueous H + ions increases. What kind of substance has been added to the water? an acid a base water either an acid or a base

What is the significance of the Galápagos Islands to the theory of evolution

Determine the molar mass of an unknown monoprotic acid to two decimal places if 20.01 ml of a 0.098 m naoh solution were used to titrate 0.215 g of the unknown acid

A diatomic molecule with a triple covalent bond is A. H2 B. N2 C. O2 D. Br2 (P. S. The answer turned out to be B. N2)

Consider the following half-reactions: Half-reaction E° (V) I2 (s) + 2e - 2I - (aq) 0.535V 2H + (aq) + 2e - H2 (g) 0.000V Zn2 + (aq) + 2e - Zn (s) - 0.

Where did the longest tsunami form?

Calculate the number of H atoms in 0.190 mole C 6 H 14 O .