The third chemistry of the metal problem knows that D is to be explained

Important: Balance balance, under known conditions, only the same amount of gas can be generated. Therefore, 1 is correct, the same mass and equal mass fraction of hydrochloric acid is completely consumed, and the same amount of gas is produced.

2. Error, from the molar mass of calcium carbonate is greater than that of magnesium carbonate, the same mass of calcium carbonate and magnesium carbonate, the number of moles of magnesium carbonate is more, if calcium carbonate and magnesium carbonate are not left, then magnesium carbonate produces more gas, and the balance should be tilted towards calcium carbonate. 3. Correct, probably, the analysis is derived from 2.

The essence of the mass change in both reactions is that H ions combine with carbonate ions to form carbonic acid, which is then decomposed into water and carbon dioxide. Changes in carbon dioxide are key. Write out chemical equations.

Because the mass is still equal after the reaction, the amount of carbon dioxide produced is equal. That is, in both reactions, H ions are bound as much as carbonate ions. Because the hydrochloric acid is of equal mass, there are the same number of H ions, and the same amount of carbonate ions are required.

The relative atomic mass of calcium carbonate is greater than that of magnesium carbonate, so either they are fully reacted and the hydrochloric acid is reacted, so that the H ions consumed are the same as the carbonate ions, and the carbon dioxide generated is the same; Either magnesium carbonate just reacts hydrochloric acid, and calcium carbonate also reacts hydrochloric acid, but there is a surplus (or because of its large relative atomic mass). So the answer is d pure hand hitting, hope.

1.The iron crust is rich in socks, malleable, ferromagnetic, and can be used as various metal products and magnetic materials;

Aluminum is lighter, has a dense oxide protective film, corrosion resistance, and can be used as aviation materials.

Copper has good conductivity and can be used as cables;

Silver has good malleability and can be used as jewelry.

2.Good ductility, oxidation resistance, corrosion resistance.

3.I don't know.

4.It is under the condition of high temperature that O2 and C react to form CO2 to remove C in pig iron, that is, C + O2 = high temperature = CO2

The melting point is lowered, which is convenient for casting molding.

2.Added some special features. For example:

Aluminum alloy, aluminum alloy is made of pure aluminum with some alloying elements, such as aluminum-manganese alloy, aluminum-copper alloy, aluminum-copper-magnesium duralumin alloy, aluminum-zinc-magnesium-copper superduralumin alloy. Aluminum alloy has better physical and mechanical properties than pure aluminum: easy processing, high durability, wide range of application, good decorative effect, and rich colors.

For example, the advantages of magnesium alloy are small density, high specific strength, high specific stiffness, strong seismic ability, and can withstand large impact loadsAt the same time, it has good cutting and polishing performance, and is an important structural material for aerospace, instrumentation, transportation and other industrial sectors.

3.The hardness of an alloy is greater than the metal of which it is composed. For example, aluminum alloys.

Use iron and not apply to disturb the aluminum, cherry blossom and plum rent.

Iron pot, stir-fry with aluminum pot for a long time, aluminum poisoning. Iron-containing soy sauce.

Aluminum is not iron.

The aluminized paper pieces wrapped in chewing gum are difficult to plating with spine iron and high cost.

Iron thermal conductivity.

Aluminum ductility.

Copper conductivity.

Silver has a metallic sheen.