Nope, it's a physical change. When ice melts it changes into liquid water, it's still water. Changes in which no new substances are formed are physical changes, hence this is a physical change.
The molarity of a solution is the number of moles of a substance divided by the volume in liters prepared.
, where n is number of moles and V is the volume in liters.
In order to calculate the mass of solute we need to convert the volume and molarity to moles
![1.421 L solution \times\frac{0.0730 moles}{1 Lsolution}= 1.037 mol NaCO_3](https://tex.z-dn.net/?f=1.421%20L%20solution%20%5Ctimes%5Cfrac%7B0.0730%20moles%7D%7B1%20Lsolution%7D%3D%201.037%20mol%20NaCO_3)
Now that we have moles we use the relative formula mass of NaCO₃, We have 1 Na atom, 1 C atom and 3 O atoms, thus
![M_r= (1\times 22.99) + (1\times 12.00) + (3\times 16.00)= 82.99g/mol](https://tex.z-dn.net/?f=M_r%3D%20%281%5Ctimes%2022.99%29%20%2B%20%281%5Ctimes%2012.00%29%20%2B%20%283%5Ctimes%2016.00%29%3D%2082.99g%2Fmol)
![1.037 \times\frac{82.99g}{mol} = 86.1g](https://tex.z-dn.net/?f=1.037%20%5Ctimes%5Cfrac%7B82.99g%7D%7Bmol%7D%20%3D%2086.1g)
Answer:
a. Work
Explanation:
If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion.
Answer:
1.67g/cm3
Explanation:
The formula for density is
. The m variable stands for mass and the v variable stands for volume.
The mass of the brown sugar is 10.0g and the volume is 6.0cm3, so we can plug those values into the equation.
![d=\frac{10g}{6cm^{3} }](https://tex.z-dn.net/?f=d%3D%5Cfrac%7B10g%7D%7B6cm%5E%7B3%7D%20%7D)
![d=1.67](https://tex.z-dn.net/?f=d%3D1.67)
![\frac{g}{cm^{3} }](https://tex.z-dn.net/?f=%5Cfrac%7Bg%7D%7Bcm%5E%7B3%7D%20%7D)
Rounded to 3 significant figures, the density of the block of brown sugar is 1.67 g/cm3. If the mass is in grams and the volume is in cm3, the unit for the final answer is
(grams per centimetres cubed).