Cutting of Nails is a Physical Change since no new substance is formed.
Don't confuse it with Reversible and Irreversible Changes
Answer:
Explanation:
1 mole of any substance contains the same number of particles. The particles can vary (atoms, molecules, formula units), but there are always 6.022*10²³ particles. In this case, the particles are formula units of potassium nitrate or KNO₃.
Let's create a ratio.
Since we are trying to find the formula units in 0.250 moles, we multiply by that number.
The units of moles of potassium nitrate cancel.
The denominator of 1 can be ignored, so we can make a simple multiplication problem.
If we round to the nearest tenth, the 0 in the hundredth place tells us to leave the 5 in the tenth place.
0.250 moles of potassium nitrate is approximately equal to 1.5*10²³ formula units of potassium nitrate and choice B is correct.
Answer is: <span>A. 1 molecule with 10 atoms.
Every ball represent one atom in one molecule.
</span><span>The </span>ball and stick model<span> is a </span>molecular model<span> of a </span>chemical substance<span> that shows the </span>three-dimensional<span> position of the </span>atoms<span> and the </span>bonds between them. <span>The atoms have spherical shape and they are </span><span>connected with sticks (one, two or three, depends on bonds).</span>
Answer:
A
Explanation:
B. That's a solid
C. Liquid is the only thing that can have viscosity
D. Not necessarily the case
The square brackets are used in case of complex compounds. This is known as coordination sphere. There is a metal in the coordination sphere and ligands attached to it. This complete set of metals and ligands inside the brackets is complex ion or molecule.
The ions outside this coordination sphere are counter ions of the complex.
It represents that if the complex compound is dissolved in water it will give a complex ion and the counter ion. The atoms in the bracket cannot break there bonds and will remain un-dissociated.
If there is no such bracket then it will represent simple or binary salt.
