4x Which of the following statements describes a difference between a mixture and a pure substance? dx A The density of a mixture can change with temperature, but the density of a pure substance cannot change. 4x B The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same. C A mixture has a specific melting point, while the melting point of a pure substance can vary. D A mixture tends to be homogeneous, while a pure substance tends to be heterogeneous.

An ionic crystalline solid is hit with a hammer and shatters. Which of these is a property the solid will exhibit? malleability brittleness conductor

Question Carbohydrates usually have __ as many hydrogen atoms as carbon and oxygen atoms. Answer Input Soeling counts but capitalization doesn't $\square $

How many grams of sodium hydroxide are required to dissolve in 232 g of water to make a 2 .88 m solution? $NaOH:39.99g/mol$ $[?]gNaOH$

Which of the following steps in solution formation is exothermic? Answer: A intermolecular forces. Overcoming the solute-solute B intermolecular forces. Overcoming the solvent-solute C intermolecular forces. Overcoming the solvent-solvent D intermolecular forces. Establishing the solute-solvent

$P_{2}O_{3}+3H_{2}O\rightarrow 2H_{3}PO_{3}$ How many grams of diphosphorus trioxide, $P_{2}O_{3}$ . are required to react completely with 4.0 moles $H_{2}O$ ? molar mass $P_{2}O_{3}:109.94g/mol$ $[?]gP_{2}O_{3}$

A solution is made by dissolving 42.3 g of potassium hydroxide in 329 g of water . What is the molality of the solution? $KOH:56.11g/mol$ () m KOH

Devin knows(that his sample of strontium sulfate contains 2.4 moles. How many grams is this? Answer: $\square $

Write the names of the following ionic compounds: $NiSO_{4}$ $\square $ $Fe_{2}(SO_{3})_{3}$ $\square $ $Pb(NO_{2})_{2}$ $\square $ $SnCO_{3}$ $\square $

Type the correct coefficient for each reactant and product. 1) Balance the chemical equation for the $\square Na_{2}CO_{3}(aq)+\square H_{2}SO_{4}(aq)\rightarrow \square CO_{2}(g)+\square H_{2}O(l)+\square Na_{2}SO_{3}(aq)$ 2) Balance the chemical equation for the reaction of aqueous sodium hydroxide and sulfuric acid. $\square NaOH(aq)+\square H_{2}SO_{4}(aq)\rightarrow \square H_{2}O(l)+\square Na_{2}SO_{4}(aq)$

Which of the following is a double replacement reaction? $Ca(OH)_{2}+H_{2}SO_{4}\rightarrow CaSO_{4}+2H_{2}O$ $CH_{4}+2O_{2}\rightarrow CO_{2}+2H_{2}O$ $8Fe+S_{8}\rightarrow 8FeS$ $Zn+H_{2}SO_{4}\rightarrow ZnSO_{4}+H_{2}$