Answer:
There are over 10 hazards or more at construction sites ,below are examples
Explanation:
1.Working at height.
2.Moving objects.
3.Slips, trips, and falls.
4.Noise.
5.Hand arm vibration syndrome.
6.Material and manual handling.
7.Collapsing trenches.
8.Asbestos.
9.Electricity.
10.Airborne fibres and materials.
From the experiment it can be concluded that a material or object which has a density that is lesser than water floats. Also, the object that has a density greater than that of water will sink. This is because density is the measure of the amount of substance that is occupied by an object in a given volume.
Answer:
Molarity = 1.23 M
Explanation:
Given data:
Molarity of NaCl = ?
Mass of NaCl = 89.94 g
Volume of solution = 1249 mL ( 1249/1000 = 1.249 L)
Solution:
First of all we will calculate the number of moles of NaCl.
Number of moles = mass/molar mass
Number of moles = 89.84 g/ 58.5 g/mol
Number of moles = 1.54 mol
Molarity:
Molarity = Number of moles of solute / volume of solution in L
Molarity = 1.54 mol / 1.249 L
Molarity = 1.23 M
Answer:
m = 0.544 moles/kg
Explanation:
To do this, we need to use the expression for molality of a solution which is:
m = n / kg water
Where:
n: moles of solute
m: molality of solution
In this case, we have the moles of the solute, which is the C6H12O6 and the grams of water, and these grams would have to be turn into kg. Let's do this first:
kg of water = 150 g * 1 kg / 1000 g = 0.150 kg of water.
Now, replacing in the above expression of molality, we can calculate the molality of the solution:
m = 0.0816 / 0.150
<h2>
m = 0.544 moles/kg</h2>
Answer:
70%
Explanation:
105 divided by 150 equal to 0.7. then u multiply 0.7 by 100. equal 70. so its C because efficiency = (effective work)/(executed work) * 100%
hope it helped :3
