Question

question 19 (5 points) a liquid has a volume of 34.6 ml and a mass of 46.0 g. what is the density of the liquid? 1330 g/ml 1.00 g/ml 0.752 g/ml 1.33 g/ml 0.663 g/ml question 20 (5 points) the measurement 0.000 0043 m, expressed correctly using scientific notation, is 0.43×10⁻⁵ m. 4.3×10⁻⁶ m. 4.3×10⁶ m. 4.3×10⁻⁷ m. 4.3 m.

Explanation:

Step1: Recall density formula

The formula for density $
ho$ is $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume.

Step2: Substitute values

Given $m = 46.0\ g$ and $V=34.6\ mL$, then $
ho=\frac{46.0\ g}{34.6\ mL}\approx1.33\ g/mL$.

Step3: Recall scientific - notation rules

For a number $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer. For the number $0.0000043$, we move the decimal point 6 places to the right to get a number between 1 and 10. So, $0.0000043 = 4.3\times10^{-6}$.

Answer:

Question 19: D. 1.33 g/mL
Question 20: B. $4.3\times10^{-6}\ m$