Answer:
B) translucent
Explanation:
Light only partially passes through them.
Answer:
1) Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
You would see the reaction forming bubbles vigorously. Hydrogen gas is produced in the process.
Answer:
No, it is not balanced.
The balanced equation is: Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.
Explanation:
- To balance the equation, you should apply the law of conservation of mass for the equations.
- The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).
- For the given equation: <em>Zn(OH)₂ + NaOH → Na₂ZnO₂ + H₂O.</em>
The no. of Na atoms in reactants side is 1 but in products side is 2.
The no. of H atoms in reactants side is 3 but in product side is 2.
<em>So, the equation is not balanced.</em>
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- The balanced equation is:
<em>Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.</em>
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- The no. of all atoms is the same in both of reactants and products side.
Zn (1), O (4), H (4), and Na (2).
In 1803AD, Osmium was discovered by Smithson Tennant when dissolving an impure sample of platinum in aqua regia, a mixture of hydrochloric and nitric acids. He was able to determine that the black powder left behind after dissolving the platinum was actually a mixture of two new elements, indium and osmium.
•Osmium is a bluish-white and shiny metal.
•Osmium is very hard and is brittle even at very high temperatures.
•Osmium has the lowast vapor pressure and the highest melting point among the platinum group of metals.
•Osmium's density is slightly more than iridium hence is credited as the heaviest element.
10. One of the first models of the atom was proposed by Niels Bohr. In his model, electrons existed in basic energy levels called *
A. rows
B. orbits
C. families True
D. orbitals
11. What does the principal quantum number indicate about a given electron? *
A. The shape of the electron cloud. True
B. The direction the electron is spinning.
C. The speed of the electron.
D. he general energy level of the electron.
12. When an electron drops down from an excited state to its ground state, the electron *
A. Doubles its energy
B. Moves away from the nucleus
C. Gives off energy in the form of light True
D. Absorbs additional quantas of energy
