1. A mixture is found to contain 0.69 g SiO2, 1.05 g of cellulose, and 2.17 g of calcium carbonate. What is the mass percentage of SiO2 in this mixture?

The atomic number tells the number of ___ proton neutron ._.

4g of sugar is dissolved in 46 g of water calculate the concentration as percent by mass

What units of measurement do scientists use?

In a binary system, what is the maximum number of phases that can co-exist under the equilibrium conditions? One a b Two Three C d Four

Describe how electron movement is related to the bonding in methane, CH4. A) Electrostatic sharing of electrons allows ionic bonds to form. B) The atomic orbitals overlap and share electrons to form covalent bonds.

Given the following list from the activity series of metals (from most active to least active) K, Na, Al, Mn, Cr, Cd, Co, Pb, Hg which reaction would you NOT expect to occur? 1. Co²⁺ (aq) + Al (s) → Al³⁺ (aq) + Co (s) 2.

Chemical reactions that release energy A. will not occur. B. need catalysts to occur. C. will always explode. D. often occur spontaneously.

Which metal exist in liquid state and can be cut with knife?

Based on the ionization energies of the alkali metals, which alkali metal would you expect to undergo the least exothermic reaction with chlorine gas? Express your answer as a chemical symbol.

An atom of a particular element is traveling at 1.00% of the speed of light. The de Broglie wavelength is found to be 3.31 * 10-3 pm. Which element is this? Prove it.