Answer:
Part 1:sodium
rubidium
Part 2: protons neutrons and electrons are all 12
The number of protons is equal to the no. of neutrons from the electronic arrangement of magnesium and the no. of electrons is got from the atomic no. of magnesium
When two atoms of Hydrogen combine together, or fuse, they make an atom of Helium.
Yes i believe there are energy changes when substances are dissolved in water which are either exothermic or endothermic. When a substance is dissolved in water and temperature goes up, heat is released or produced which is called exothermic change. Most substances dissolve in water lowering the temperature and are endothermic changes as energy is absorbed. For example when sodium chloride dissolves in water there is very little change in temperature which is exothermic.
Answer:
a. pH paper can tell you the pH. pH paper only can turn a variety of colors that represent different pH numbers.
B. Litmus paper only tells you acid or base in order to turns red or blue color.
Explanation:
pH paper is a type of paper which is used for the identification of pH of the substance. On pH paper, colors are present which shows pH numbers of a solution while litmus paper is a type of paper which is used for the identification of solution whether it is acidic or basic. There are two colors i. e. Red and Blue. If the litmus paper turns red, the solution is acidic or if the litmus paper turns blue, the solution is alkaline or basic.
Answer:
Explanation:
<em><u>1) Data:</u></em>
a) V = 10.0 l
b) He, m₁ = 48.5 g
c) CO₂, m₂ = 94.6 g
d) T = 398 K
e) p = ?
<em><u>2) Formulae:</u></em>
a) ideal gas equation: pV = nRT
b) Number of moles, n: n = mass in grams / molar mass
<em><u>3) Solution:</u></em>
a) <u>Number of moles of He</u>:
- atomic mass of He: 4.003 g/mol
- n₁ = 48.5 g / 4.003 g/mol = 12.12 mol
b) <u>Number of moles of CO₂</u>:
- molar mass of CO₂: 44.01 g/mol
- n₂ = 94.6 g / 44.01 g/mol = 2.15 mol
c) <u>Total number of moles of the gas mixture</u>:
- n = n₁ + n₂ = 12.12 mol + 2.15 mol = 14.27 mol
d) <u>Pressure, p:</u>
- p = 14.27 mol × 0.0821 atm-l/K-mol × 398K / 10.0l = 46.6 atm
