The rover was designed to explore A.Mars
Answer:
The arrangement of particles is least ordered is a > c > b > d
Explanation:
Given that,
The arrangement of particles is least ordered in a sample of NaCl.
We know that,
The least ordered arrangement are.
The form of state of particle in least ordered.
So, The least ordered arrangement will be
aqua > gas > liquid > solid
The arrangement of particles is least ordered in a sample of NaCl

Hence, The arrangement of particles is least ordered is a > c > b > d
Answer:
0.025g
Explanation:
Firstly, we need to write a balanced chemical equation.
Ca + 2H2O —-> Ca(OH)2 + H2
From the chemical equation, we can see that one mole of calcium metal yielded one mole of hydrogen gas.
Now, we need to know the actual number of moles of hydrogen gas given off.
The number of moles is the mass divided by the atomic mass. The atomic mass of calcium is 40g/mol. The number of moles is thus 0.5/40 = 0.0125 mole
Since the mole ratio is 1:1, the number of moles of hydrogen gas produced too is 0.0125 moles.
We now Proceed to get the mass of the hydrogen gas produced. This is the number of moles of hydrogen multiplied by the molar mass of the diatomic hydrogen gas. The molar mass of the diatomic hydrogen gas is 2g/mol.
The amount given off is thus 2 * 0.0125 = 0.025g