(a) Calcium and chlorine react to give calcium chloride in acombination reaction. Write and balance the equation. (Type youranswer using the format CO2 for CO2. Use the lowest possiblecoefficients.)

__ Ca +_, _ ? ,_

(b) Heating decomposes Na2CO3 to sodium oxide and carbon dioxide.Write and balance the equation. Type your answer using the formatCO2 for CO2. Use the lowest possible coefficients.)

Na2CO3 ?,_ +___ CO2

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Deanna HettingerLv2

14 May 2019

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Fill in the nine gaps in this table.
Symbol B
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Neutrons 20
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Mass number 11 40

Identify the unknown particle (X) in the following equations fornuclear decay, and state whether each process is alpha decay, betadecay, or gamma decay. (Type your answer according to this format:4 2 He represents . Use gamma to enter ?.)
(a) ? X + -
X =

(b) ? + X
X =

(c) ? + X
X =

Actinium-225 () undergoes alpha decay.
(a) Write the equation. (Enter the mass number in the first raisedbox, the atomic number in the second lower box, and the element,with charge if necessary, in the third box.)
? + He

(b) The daughter formed in part (a) undergoes beta decay. Write theequation. (Enter the mass number in the first raised box, theatomic number in the second lower box, and the element, with chargeif necessary, in the third box.)
? + e

Classify each of the following materials as an element, compound,heterogeneous mixture, or homogeneous mixture.
(a) concrete
element
compound
heterogeneous mixture
homogeneous mixture

(b) clear apple juice
element
compound
heterogeneous mixture
homogeneous mixture

(c) nitrogen
element
compound
heterogeneous mixture
homogeneous mixture

(d) ozone
element
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heterogeneous mixture
homogeneous mixture

Refer to the figure below. Find the approximate solubility (g/100 gwater) of sugar at 20Â°C.
g/100 g of water

Give the symbol for each of the following elements.
(a) lead

(b) sodium

(c) oxygen

Give the name of each element.
(a) Cu

(b) Bi

(c) Ti

Volcanoes emit much hydrogen sulfide gas, H2S, which reacts withthe oxygen in the air to form water and sulfur dioxide, SO2. Every53 tons of H2S reacts with 75 tons of oxygen and forms 28 tons ofwater. How many tons of SO2 are formed?

An antacid tablet weighing 0.939 g contained calcium carbonate asthe active ingredient, in addition to an inert binder. When an acidsolution weighing 56.233 g was added to the tablet, carbon dioxidegas was released, producing a fizz. The resulting solution weighed56.954 g. How many grams of carbon dioxide were produced?

Calculate (to the nearest 0.1 u) the formula mass of thesecompounds.
(a) sodium phosphate, Na3PO4
u

(b) methane, CH4
u

(c) silver cyanide, AgCN
u

Calculate (to the nearest 0.1 u) the formula mass of thesecompounds.
(a) silver carbonate, Ag2CO3
u

(b) calcium bromide, CaBr2
u

(c) magnesium hydroxide, MgOH
u

Balance these chemical equations. (Use the lowest possiblecoefficients.)
(a) O2 + N2H4 ? H2O2 + N2

(b) Sr + H2O ? Sr(OH)2 + H2

(c) NH3 + O2 ? N2 + H2O

(d) Al + Fe3O4 ? Al2O3 + Fe

(e) Fe(OH)2 + O2 + H2O ? Fe(OH)3

(f) Pb(NO3)2 ? PbO + NO2 + O2

(a) Calcium and chlorine react to give calcium chloride in acombination reaction. Write and balance the equation. (Type youranswer using the format CO2 for CO2. Use the lowest possiblecoefficients.)

Ca + ?

(b) Heating decomposes Na2CO3 to sodium oxide and carbon dioxide.Write and balance the equation. Type your answer using the formatCO2 for CO2. Use the lowest possible coefficients.)

Na2CO3 ? + CO2

Write and balance the reaction for the complete combustion ofmethanol, CH3OH. (Type your answer using the format CO2 for CO2.Use the lowest possible coefficients.)

Write and balance the reaction for the complete combustion ofmethanol, CH3OH. (Type your answer using the format CO2 for CO2.Use the lowest possible coefficients.)
( )CH3OH + ( ) ( ) ? ( ) ( ) + ( )H2O

Write and balance the reaction for the complete combustion ofbutene, C4H8. (Type your answer using the format CO2 for CO2. Usethe lowest possible coefficients.)
______ C4H8 + ______,_______ ? _____,______ +______ H2O

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