This is the answer hope this helps
In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to
2 answers:
<u>Answer:</u> The correct answer is a new substance is formed in this process, which is an important clue to chemical change.
<u>Explanation:</u>
Chemical change is defined as the process in which change in composition takes place. A new substance gets formed in this process. For Example: Formation of water molecule from hydrogen and oxygen gas.
A physical change is defined as the process in which change in shape, size and color takes place. No change in composition takes place as no new substance is getting formed. For Example: Melting of ice
We are given:
Sodium carbonate is being formed from sodium bicarbonate. The reaction for this follows:
As, new substance which is sodium carbonate is getting formed. Thus, it is a chemical change.
Hence, the correct answer is a new substance is formed in this process, which is an important clue to chemical change.
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Answer:
The value of the heat capacity of the Calorimeter = 54.4
Explanation:
Given data
Heat added Q = 4.168 KJ = 4168 J
Mass of water = 75.40 gm
Temperature change = ΔT = 35.82 - 24.58 = 11.24 ° c
From the given condition
Q = ΔT +
ΔT
Put all the values in above equation we get
4168 = 75.70 × 4.18 × 11.24 + × 11.24
611.37 = × 11.24
= 54.4
This is the value of the heat capacity of the Calorimeter.
Answer:- molecules.
Solution:- The grams of tetrabromomethane are given and it asks to calculate the number of molecules.
It is a two step unit conversion problem. In the first step, grams are converted to moles on dividing the grams by molar mass.
In second step, the moles are converted to molecules on multiplying by Avogadro number.
Molar mass of = 12+4(79.9) = 331.6 g per mol
let's make the set up using dimensional analysis:
= molecules
So, there will be molecules in 250 grams of
.