A sample of pure calcium fluoride with mass of 15 0 g continue 7.70 g of calcium

Question

A sample of pure calcium fluoride with mass of 15 0 g continue 7.70 g of calcium. How much calcium is contained in 45 .0 g of calcium fluoride? 2.56g 7.70 g 15.0 g 23.1g Which of the following statements describe a physical property of oxygen? Iron will nisi in the presence of oxygen. Oxygen combines with carbon to form carbon dioxide gas. The pressure is caused by collision of oxygen molecules with the sides of a container. When coal is burned in oxygen, the process is called combustion. Which of the following underlined items .s not an intensive property'? A chemical reaction requires 3.00 g of oxygen. Solid copper hydroxide is blue colored. The density of helium at 25degreeC is 1.64 times 10^-4 g/cm^3. The melting point of aluminum metal is 933 K. If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an). heterogeneous mixture element homogeneous mixture compound mixture of elements Which one of the following is often easily separated into its components by simple techniques such as filtering or decanting? heterogeneous mixture compounds homogeneous mixture elements solutions A combination of a soluble salt and water is an example of a. homogeneous mixture heterogeneous mixture compound pure substance solid

Explanation / Answer

6 ) 15 g contains = 7.70 g of CaF

45 gContains = X g CaF

45 x 7.70 = 15x X

346.5 = 15 x X

X = 346.5 / 15

= 23.1 g CaF

Ans = d ) 23.1 g

7 ) A= Chemical property = Fe & Oxygen reacts to form rust

B= Chemical property = C + O2-------> CO2

C = Physical property = Pressure is physical property & no any chemical process takes place.

D = Burning is the oxidation process which is chemical change.

ans = C)

8) Intensive proprty means the property which do nat change with change in matter.

A= 3 g chages ( Weight )

B = Colour does not change with amount of copper.

C = Density do not change

D ) Melting point does not change with quantity.

Ans = A.

9) Ans = C ) Homohenius mixture = Such type of mixtures are uniforn throughout & seperated by tecniques such as disillation.

10 )Ans =A) Heterogenius mixture = Such mixture are forms a boundry between two substances or there phases are different & therefore easily seperated by filtering or decanting.

11) Ans = A ) Homogenius mixture = Becouse they cannot be seperated by simple processes. It requires some chemical proceses to seperate it.

  

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