Answer:
Iodine (I)
Explanation:
The atomic mass of Arsenic (As) is 74.92 amu. Also, we know that Halogen Group consists of following elements.
Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine
And in given four options only Chlorine and Iodine belongs to halogen family. And we know that the atomic mass of chlorine is 35.45 amu which is less than that of Arsenic, therefore Iodine with atomic mass of 126.90 amu is the correct answer.
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or predictions. Hope this helps
Answer:
A water molecule is made up of two hydrogen atoms and one oxygen atom.
Explanation:
<u>Ans: (2) The gas particles have no attractive forces between them.</u>
The kinetic theory explains the behaviour of a hypothetical ideal gas. It explains pressure in terms of the collision of gas particles against the walls of the container which it occupies.
The kinetic theory of gases is based on three main postulates:
1) The collision between gas particles is elastic i.e. no energy is lost or gained
2) The gas particles are treated as point masses i.e. the volume occupied by the gas particles is negligible when compared to the volume of the container
3) There are no attractive or repulsive forces between particles.
Answer:
BaN, Ba₃N₂
Explanation:
In order to determine the empirical formula of a compound, we have to follow a series of steps.
Step 1: Determine the percent composition
Step 2: Divide each percentage by the atomic mass of each element
Step 3: Divide all numbers by the smallest one
Step 4: If necessary, multiply by a number so the coefficients are whole
Compound 1
Step 1
Ba: 90.745%
N: 100% - 90.745% = 9.255%
Step 2
Ba: 90.745/137.33 = 0.66078
N: 9.255/14.01 = 0.6606
Step 3
Ba: 0.66078/0.6606 ≈ 1
N: 0.6606/0.6606 = 1
The empirical formula is BaN.
Compound 2
Step 1
Ba: 93.634%
N: 100% - 93.634% = 6.366%
Step 2
Ba: 93.634/137.33 = 0.68182
N: 6.366/14.01 = 0.4544
Step 3
Ba: 0.68182/0.4544 = 1.5
N: 0.4544/0.4544 = 1
Step 4
Ba: 1.5 × 2 = 3
N: 1 × 2 = 2
The empirical formula is Ba₃N₂.
