Answer:
Atomic Number: 19
Approximate Weight: 39.10 g/mol
Element: Alkali Metal
Explanation:
The Periodic Table of Elements gives these 3 information already.
Answer:
.72 mols of KCl
Explanation:
Read the explanation while looking at the picture.
We start with 89g because it's what they give us:
89g of KCIO3 will cancel out with 123g of KCIO3 (molar mass)
~Grams of KCIO3 are canceled out.~
That 123g of KCIO3 is the same as 1 mol of KCIO3
Then we use mole to mole ratio:
1 mol of KCIO3 equals 2 mols of KCIO3 -- 2 moles from the equation
The 2 mols of KCIO3 is equal to 2 mols of KCl (from equation)
Multiply the numbers on top. Multiply the numbers on the bottom. Then divide. You get:

This sounds confusing. But the picture below is the format.
The SAME COLOR are the ones that cancel out.
Ask your mum she smarter than u
Answer:
radiometric dating
Explanation:
The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample. Radioactive isotopes break down in a predictable amount of time, enabling geologists to determine the age of a sample using equipment like this thermal ionization mass spectrometer.
Hope this helps!
Answer:
-0.276 Degrees C
Explanation:
kf of water is 1.86
Freezing point depression= m x kf x i
i= ions present ( K+ Cl-) 1=2
1.86x2X.743= .276
Since its freezinf point depression the freezing point will lower
so
0-.276= -.276