1. 1g A metal M reacts completely with an appropriate amount of dilute sulfuric acid to obtain 5g of bivalent metal sulfate, then the relative atomic mass of the metal is ().
A40 B 18 C24 D56
2. After the mixture containing10g of A, B and C is heated, A will all participate in the reaction, C will increase 8g and generate 4gD at the same time, so the mass ratio of A to B in the reaction is ().
a 1:5 B5: 1 C4: 1d 1:4
3. The following is () to prevent the quality of substances in the air from increasing but not deteriorating after a period of time.
A salt solution b sodium chloride c caustic soda d concentrated acid
4. After the mixture of A, B and C of10g is heated, A will all react, C will increase by 38g, and 34gD will be generated at the same time, so the mass ratio of A and B in the reaction is ().
a5: 1 b 1:5 c 1:4 D4: 1
5.a, B and C are 15g. When they react completely, 30 grams of new substance D is produced. If you add 10gC, they will continue to react. When the reaction is completed, A and B are just consumed. Then the mass ratio of A and B participating in the reaction is ()
a2: 1 B3:2 c 1: 1 D2:3
Fill in the blanks:
6. It is known that X+3Y=2Z, and the existing 6gX reacts with enough y to generate 12gZ, then the ratio of relative molecular weights of x, y and z is.
7. At 2A+B=C+2D, 5gA and 5gB react completely to form 12ghz. If 4gA reacts with enough b, D g can be generated.
8. In the reaction A+2B=3C+D, the relative molecular weight ratio of C and D is 22: 9. It is known that 2.8gA reacts completely with a certain amount of B to generate 8gC, so the mass ratio of B and D is in this reaction.
Answer the question:
9. Please design an experiment to distinguish soda ash, liquor and salt solution, and write down the operation steps, phenomena and conclusions.
Calculation problem:
10.00ml potassium chloride solution with solute mass fraction of 10% (density: 1. 1g/ml) Calculation: What is the mass fraction of the same volume of aqueous solution added to the solution? (Keep one decimal place).
1 1. Put 33.8g of the mixture of sodium chloride and sodium carbonate into125g of dilute hydrochloric acid, and fully react to obtain150g of sodium chloride solution. Calculation: If the obtained solution is diluted to 8% solution, how much water should be added?