Henry divides 1.060 g by 1.0 mL to find the density of his water sample.How many significant figures should he include in the density value that he reports? one two three four

How many moles of sodium atoms are there in 4.4 grams of sodium carbonate? A. \$2.5\times 10^{22}\$ moles \begin{array}{|c|c|c|} \hline 6\ &\ 8\ &\ 11\ \\ C\ &\ 0\ &\ Ns\ \\ 12.01\ &\ 16.00\ &\ 23.00\ \\ \hline \end{array} B. \$5.0\times 10^{22}\$ moles C. 0.04 moles D. 0.08 moles E. 0.12 moles

Question 8 of 10 Why do metals conduct electricity? A. All covalent bonds conduct electricity. B. Metals never give up electrons. C. A lattice of ions allows valence electrons to move easily. D. The electrons in metals are inside the nuclei of the atoms.

A gas occupies 667.9 mL at a temperature of $26.4^{\circ }C$ What is the volume of gas at $122.87^{\circ }C$ assuming pressure did not change? Give your answer in L to the hundredths place. Do not put units in the answer space.

Consider the following compounds. Which is insoluble? $VI_{2}$ $HgBr_{2}$ ONaBr NaCl All of these None of these

How many oxygen atoms are found in a 33 g sample of manganese(III)nitrite? A. $2.06\times 10^{23}$ 0 atoms 8 7 25 N Mn 16.00 14.01 54.94 B. $4.57\times 10^{23}$ 0 atoms C. $5.10\times 10^{23}$ 0 atoms D. $6.18\times 10^{23}$ O atoms E. . $7.42\times 10^{23}$ 0 atoms

Which of these reactions forms a precipitate as a product? $AlPO_{4}+3LiBr\rightarrow ??$ $FeCl_{2}+BeS\rightarrow ??$ $NaOH+NH_{4}ClO_{3}\rightarrow ??$ $K_{2}CO_{3}+2CsCH_{3}COO\rightarrow ??$

When $CuCl_{2}$ reacts with $NaNO_{3}$ , NaCl and $Cu(NO_{3})_{2}$ are produced as shown in the following balanced chemical equation. $CuCl_{2}+2NaNO_{3}\rightarrow 2NaCl+Cu(NO_{3})_{2}$ Suppose 19.35 g $CuCl_{2}$ reacts with 20.31 $NaNO_{3}$ Determine how many moles of $Cu(NO_{3})_{2}$ will be produced if 19.35 g $CuCl_{2}$ reacts with excess $NaNO_{3}$ The molar mass of $CuCl_{2}$ is $134.45g/mol$

6.2 g of an ionic compound is dissolved in a coffee-cup calorimeter containing 100.0 g of water at $16.2^{\circ }C$ The temperature of water increased to $19.5^{\circ }C$ What is the $\Delta H$ of the dissolution process in $kJ/mol$ of compound)? Assume that the specific heat of the solution is same as specific heat of water $(4.184$ $J/g^{\circ }C)$ The molar mass of the ionic compound is $72.1g/mol$

Which of the following is a proper use for a calorimeter? Multiple Choice measuring heat of combustion measuring temperature of a mixture measuring the amount of oxygen consumed in a combustion reaction measuring entropy of a reaction

Drag the tiles to the boxes to complete the pairs. Match the elements to their periodic table groups based on their uses or properties. \begin{array}{|c|c|} \hline\ Element\ is\ used\ as\ a\ disinfectant\ &\ \begin{array}{l}\ Element\ important\ for\ the\ proper\ \\ functioning\ of\ the\ human\ body. \end{array} \\ \hline Element always stored under oil. & \begin{array}{l}\ Compounds\ of\ this\ element\ are\ \\ used\ in\ manufacturing\ of\ paints. \end{array} \\ \hline group 3-12 & \\ \hline group 1 & \\ \hline group 17 & \\ \hline group 2 & \\ \hline \end{array}