What is the charge of an iron atom with 24 electrons? -2 +24 -24 +2

13. Given the reaction: $Mg+2HCl\rightarrow MgCl_{2}+H_{2}$ What is the total number of grams of Mg consumed when 0.5mole of H2 is produced? 6.09 12g 3.0g 24g

10. Salt dissolved in water is classified as a: Pure substance Heterogeneous mixture Homogeneous mixture Compound

3. If 0.60 moles of iron sulfide react with 1.20 moles of oxygen, which is the limiting reactant? $4FeS+9O_{2}\rightarrow 2Fe_{2}O_{3}+4SO_{3}$

2. What is the gram-molecular mass of the compound with the formula $CH_{3}COOH$ 22.4g 44.09 48.09 60.09

1. What is the mass of 1.00 mole of f 02 gas? $O_{2}$

6. What trend in atomic radius occurs across a period on the periodic table? What causes this trend?

Which example is an exothermic reaction? melting ice condensation dissolving ammonium nitrate in water to cool the water dissolving sugar in water

19. How many milliliters of isopropyl alcohol would you use to prepare 870mL of a $20\% (v/v)$ solution of isopropy alcohol?

Which of the following is not a synthesis reaction? a $Mg+2HCl\rightarrow MgCl_{2}+H_{2}$ b $2CO+O_{2}\rightarrow 2CO_{2}$ C $3H_{2}+N_{2}\rightarrow 2NH_{3}$ d $2H_{2}+O_{2}\rightarrow 2H_{2}O$

6. Given the reaction: $Ca+2H_{2}O\rightarrow Ca(OH)_{2}+H_{2}$ How many moles of $H_{2}O$ are needed to exactly react with 2.0 moles of Ca? 1.0 mol 20 mol 0.5 mol 4.0 mol