Which element is malleable and a good conductor of electricity at STP?

(1) argon (3) iodine

(2) carbon (4) silver

A student wants to prepare exactly 250 ml of a 0.500 m aqueous potassium hydroxide solution. what mass of potassium hydroxide (molar mass = 56.10 g/mol) must the student dissolve in the 250 ml of solution?

What did early scientists assume that the polar caps had in common?

A mixture of 50% benzene and 50% toluene is contained in a cylinder at 39.36 in. hg absolute. calculate the temperature range in which a two phase system can exist.

For each of the 3 ionic compounds, select the main group element "X" belongs to ... a) X3PO4 b) CaX2 c) X2 (SO4) 3

A combustion analysis of 5.214 g of a compound yields 5.34 g co 2 , 1.09 g h 2 o, and 1.70 g n 2 . if the molar mass of the compound is 129.1 g/mol, what is the chemical formula of the compound?

Mason compare the properties of two compounds magnesium oxide is an ionic compound and hydrogen peroxide is not an ionic compound there for both compounds most likely

Cisplatin is synthesized as follows: K2PtCl4 (aq) + 2NH3 (aq)  Pt (NH3) 2Cl2 (s) + 2KCl (aq) What mass of cisplatin can be made from 100. g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?

What is the total number of protons in the nucleus of an atom of potassium-42? (1) 15 (3) 39 (2) 19 (4) 42

What happens to the equilibrium when the pressure is increased? It favors formation of products. It does not change. It favors formation of reactants. It is conserved.

After 2.0s, Isabela. was riding her bicycle at 3.0m/s on a straight path. After 5.0s she was moving 5.4m/s. What was her acceleration?