2 years ago

19 – (-11) = Express your answer as an integer.

Chemistry

2 answers:

stich3 [128]2 years ago

8 0

use the keep,change,change method.

19 + 11

19,keep, "-" change to addition, -11,change to positive

now use this

19 + 11 = (30 )

horsena [70]2 years ago

5 0

Answer:

Explanation:

You might be interested in

Photosynthesis stores energy. True or False

postnew [5]

True if im wrong u can take away my points

6 0

3 years ago

Read 2 more answers

23. Which element is most likely to be malleable?<br> a. Bromine b. Radon c. Nickel d. Carbon

Aleksandr [31]

It’s c.nickel because it’s a transition metal

7 0

3 years ago

25 g of a compound is added to 500 mL of water if the freezing point of the resulting solution is

vlabodo [156]

Answer:

a) 119 g/mol

Explanation:

-We apply the formula for freezing point depression to obtain the molality of the solution:

$\bigtriangleup T_f=K_fm, \ \ K_f=1.36\textdegree C/m\\\\\therefore m=\frac{\bigtriangleup T_f}{K_f}\\\\=\frac{0.57\textdegree C}{1.36\textdegree C}\\\\=0.4191\ mol/Kg\\\\$

#We use the molality above to calculate the molar mass:

$m=\frac{0.4191\ mol}{1\ Kg}=\frac{25\ g}{0.5\ Kg}\\\\\therefore 1 \ mol=\frac{25\ g}{0.5\ Kg}\times\frac{1\ Kg}{ 0.4191}\\\\=119.3033\approx 119\ g/mol$

Hence, the molar mass of the compound is 119 g/mol

5 0

3 years ago

“Sound plays an important role in our lives”. Give two points in support of this statement.

masha68 [24]

Sound can be used to alert us in emergencies. 2. Sound can also be used to help blind people navigate the world better. I’m sorry if these horrible but I tried lol

3 0

3 years ago

Read 2 more answers

Rocks formed by changes in heat and pressure or the presence of hot, watery fluids

Irina18 [472]

If you're looking for "what rocks are formed by changes..." it's Igneous Rocks.

3 0

3 years ago

Read 2 more answers