2H2O2 → 2H2O + O2
The mass of the compound can be calculated by the molarity. The mass of the calcium bromide in the given solution is 2.5 g.
The mass of the given compound can be calculated by the molarity formula,
Where,
M- molarity of the solution = 0.25 M
w - given mass =?
m -molar mass of Calcium bromide = 200 g/mol
v-volume in mL= 50 mL
Put the values in the formula,
Therefore, the mass of the calcium bromide in the given solution is 2.5 g.
To know more about Molarity,
ion in the aqueous solution is
(1) O2 (aq) (3) H (aq)
(2) OH2 (aq) (4) OH (aq)
Answer : The correct option is, (4) .
Explanation :
According to the Arrhenius theory, an acid is a substance that ionizes in water to gives ions (hydronium ions or hydrogen ions) and a base is a substance which ionizes in water to gives ions (hydroxide ions).
As we know that when the potassium hydroxide (KOH) dissolves in water or ionizes in water to gives ions (hydroxide ions) and ions (potassium ion). That means ion is a negative ion in aqueous solution and ions is a positive ion in aqueous solution.
Hence, the correct option is, (4) .
cesium (Cs)
magnesium (Mg)
titanium (Ti)
Answer: Potassium is the element which is less reactive than rubidium and more reactive than Calcium.
Explanation: Reactivity of an metal is defined as the tendency to loose electrons easily. In a periodic table, the reactivity increases down the group as size of the metal increases. The reactivity decreases across a period as the size of the metal decreases.
Rubidium lies in group 1, which has elements in the series: H, Li, Na, K, Rb, Cs and Fr.
And Calcium lies in period 4 which has elements in the series: K, Ca, (1st transition series), Ga, Ge, As, Se, Br and Kr.
So, the element to have reactivity more than rubidium and less than Calcium must be Potassium (K).
Answer:
A is the correct answer on edge
Explanation:
A)potassium (K)
cytoplasm
chlorophyll
nuclei
Answer:
chemical change
Explanation:
signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Give me brainliest plz
Answer:
Chemical change
Explanation:
because it tranformed into something else