Answer:indicates the number of electrons in an atom.
Explanation:
hope it helps u
Phosphorus has 5 valence
valence electrons is located to their group#
yes because of TAVE available valence electrons
Explanation:
First Question
- The correct chemical formular is ; Al2(SO4)3
Second question
The following applies;
- The mass of the products is the same as the mass of the reactants
- At least one new product formed is a gas
- Molecules are changing into different molecules
Third Question
- Zn + HCl → ZnCl2 + H2
Fourth Question
- The atoms in the original substances regroup and form a different substance
- Matter is conserved
- The same atoms are present before and after the reaction
The correct answers are 1 and 4.<span>
1. Both are hormones that control glucose
production and storage in the body.
2. Insulin and glucagon have opposite effects on
blood glucose level.
<span>Both hormones are secreted by the pancreas. Pancreas has 2 cells as alpha and beta. alpha cells
produce glucagon and beta cell produce insulin. Insulin is responsible for decreasing blood glucose
level and glucagon is responsible for increasing blood glucose level. Hence,
both hormones have opposite effects on blood glucose level and they help to
maintain blood glucose level.</span></span>
<span> </span>
Given data: <span>molar mass = 180.2 g/mol in 920.0 ml of water at 25 °c.
</span><span>the vapor pressure of pure water at 25 °c is 23.76 mm hg.
</span>Asked: <span>the vapor pressure of a solution made by dissolving 109 grams of glucose
</span><span>
Solution:
moles glucose = 109 g/ 180.2 g/mol=0.605
mass water = 920 mL x 1 g/mL = 920 g
moles water = 920 g/ 18.02 g/mol=51.1
mole fraction water = 51.1 / 51.1 + 0.605 =0.988
vapor pressure solution = 0.988 x 23.76 = 23.47 mm Hg</span>
