Answer:
d = 3.65 g/mL
Explanation:
This problem is solved by using the equation:
d= m/V
But we have to be careful with the number of significant figures and number of decimals to report our result.
There are two steps to calculate the density:
1. We should perform a substraction to determine the mass of potassium chloride.
mass KCl =( Weight cylinder + KCl ) - (Weight empty cylinder)
92.7 g - 5.55 g = 87.15 g = 87.2 ( rounded to 1 decimal place)
The rule for addition and substraction is that we round the result to the number of decimal place with the least number of decimals ( 92.7 has one decimal, 5.55 has two)
2. We can now calculate the density by dividing the mass into the volume, but retaining the number of significant figures to the number with the smallest number of significant figures, the rule for multiplication and division.
d= m/V = 87.2 g / 23.9 mL = 3.648 g/mL
87.2 has three significant figures and so does 23.9, so we have to round to 3 significant figures.
The rule here is that if the left most digital to be dropped is greater o equal to 5, we round to the nearest higher digit, so 8 is greater than 5 and we rounded up 3.648 to 3.65.
i'm pretty sure the answer you chose is correct
The low pressure system wind flow in a counterclockwise direction toward the center because low pressure are connected, and in fact often generally, by upper atmosphere with winds. Winds generally blow from high pressure to low pressure areas at the surface. The direction of deflection is caused by the rotation of the Earth and the resulting Coriolis effect.
A way to remember this is.....some stoners like to get "high around the clock" (as in clockwise, but please don't do this!!)
Low pressure systems usually bring cloudy stormy conditions, while high pressure system bring clear bright skies and in the summer, warm weather.
Answers:
7. Pistil
8. Stamen
9. Anther
10. Petals
11. Ovary, ovules
Answer:
Increasing precision with multiple measurements
Explanation:
The more measurements you take (provided there is no problem with the clock!), the better your estimate will be. Taking multiple measurements also allows you to better estimate the uncertainty in your measurements by checking how reproducible the measurements are.
