Question

The following is not one of the basic units of the SI system: meter mole gram second ampere Currently, the total number of known elements is: 83 90 92 102 118 126 238 294 Concrete contains an aggregate, consisting of silicon dioxide (SiO_2) in the form of sand or gravel, together with cement, which is a combination of calcium silicates and alumni silicates. Accordingly, concrete can be classified as An element A compound A homogeneous mixture A heterogeneous mixture None of the above The boiling point of water, expressed according to the kelvin scale, is ____ K A quantity of 254 g of sulfur was mixed with 0.032 kg of sulfur. The total amount of sulfur in the system is ___ kg. The temperature which has the same numerical value in degrees Fahrenheit and in degrees kelvin is ____ degree C. Iron has a density of 7.874 g mL^-1. Each side of a cube of iron has a length of 25.4 mm. The mass of the cube is ___ kg. The relationship between the liter and the cubic centimeter is 1 L = ____ cm^3 Of the following, the worst precision is obtained with: Burettes Graduated cylinders Pipettes Syringes Volumetric flasks The density of water is 1.00 g mL^-1 or 1.00 g-cm^-3, 1 lb = 0.453592 kg. 1 ft = 0 3048 m. The density of water is ____ lb-ft^-3.

Answer 1

7. c. gram

8. e. 118

9. d. A heterogeneous mixture

10. 100 + 273.15 = 373.15 K

11. one is in grams and the other is in kg . Take both the values in the same unit

convert 254 g into kg

254 $\times$ 1000 = 0.254 g

Total amount of sulfur is 0.254 + 0.032 = 0.286 Kg

12. maybe -40 degree celcius not sure (sorry)

13. density = mass / volume since we want mass = density * volume

= 7.8754 * (25.4*25.4*25.4)

= 0.129 Kg mL

14.1 L = 1000 cm³

15. Burettes

16. dont know