Chemistry Homework Assistance
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You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.
- 2. Describe Relationships How are energy levels and orbitals related? SC.91
- Worksheet-Law of conservation of mass Solve each of the following. Remember to follow rules of rounding and significant figures in your calculations. 1. In the complete reaction of 22.99 g of sodium with 3545g of chloride, what mass of sodium chloride is formed? 2. A 12.2 g sample of X reacts with a sample of y to form 78.9 g of XY What is the mass of Y that reacted? 3. A 10.0 g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. How many grams of oxygen reacted? 4. From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.0 g of hydrogen and 79.49 of oxygen. How much water was originally involved in the process? 5. A student carefully placed 15.6 g of sodium in a reactor supplied with an excess quantity of chloride gas. When the reaction was complete, the student obtained 39.7g of sodium chloride. How many grams of chloride gas reacted? How many grams of sodium reacted? 6. In a flask 10.3 g of aluminum reacted with 100.0g of liquid bromine to form aluminum bromide. After the reaction no aluminum remained and 8.5 grams of bromine remained unreacted. How many grams of bromine reacted? How many grams of compound were formed? 7. A 3.5 kg iron shovel is left outside through the winter.The shovel, now orange with rust, is rediscovered in the spring Its mass is 3.7 kg. How much oxygen combined with the iron? 8. When 5.0g of fin reacts with hydrochloric acid, the mass of the products, tin chloride and hydrogen, totals 8.19. How many grams of hydrochloric acid were used? 9. Iron and oxygen combine to form iron oxide (rust). List the reactants and products of this reaction. 10. After burning for three hours, a candle has lost half of its mass. Explain why this example does not violate the law of conservation of mass.
- Unit 11 Comprehensive Quiz - L Balance the following chemical equation: P_(4)+O_(2)arrow P_(2)O_(3) Use a 1 if no coefficient is needed. Coefficient for P_(4) square Coefficient for O_(2) square Coefficient for P_(2)O_(3) square
- (f) Which m etal is found in the Earth as the metal itself? Tick one box. Calcium square Gold square Lithium square Potassium square (g) Iron is found in the Earth as iron oxide (Fe_(2)O_(3)) Iron oxide is reduced to produce iron. Balance the equation for the reaction. underline ( )Fe_(2)O_(3) +underline ( )C arrow underline ( )Fe +underline ( )CO_(2) (h) Name the el ement used to reduce iron ox ide. (1) (i) What is meant by reductio n? Tick one box. square Gain of oxide square square Loss of oxygen square
- Question 11 Which of the following statements about pH are true pH is a measure of hydrogen ion concentration A single unit of change in the pH sclae is equivalent to a 20% change in hydrogen ion concentration none of the choices are correct pH measure the alkalinity of a substance more than one of the choices are correct