physical science test part 2?

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Brea

15. The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first is (1 point)sublimation.
deposition.
vaporization.
melting.

16. Which phase change is an endothermic change? (1 point)condensation
vaporization
deposition
freezing

17. How was Bohrâs atomic model similar to Rutherfordâs model? (1 point)It assigned energy levels to electrons.
It described electron position in terms of the electron cloud model.
It described how electrons gain or lose energy.
It described a nucleus surrounded by a large volume of space.

18. What is the difference between an atom in the ground state and an atom in an excited state? (1 point)The atom in the ground state has less energy and is less stable than the atom in an excited state.
The atom in an excited state has one fewer electron than the atom in the ground state.
The atom in an excited state has more energy and is less stable than the atom in the ground state.
The atom in an excited state has one more electron than the atom in the ground state.

19. The usefulness of Mendeleevâs periodic table was confirmed by (1 point)the discovery of subatomic particles.
its immediate acceptance by other scientists.
the discovery of elements with predicted properties.
the discovery of the nucleus.

20. The atomic mass of an element is (1 point)the sum of the protons and neutrons in one atom of the element.
twice the number of protons in one atom of the element.
a ratio based on the mass of a carbon-12 atom.
a weighted average of the masses of an elementâs isotopes.

21. Which general statement does NOT apply to metals? (1 point)Most metals are ductile.
Most metals are malleable.
Most metals are brittle.
Most metals are good conductors of electric current.

22. Among the alkali metals, the tendency to react with other substances (1 point)does not vary among the members of the group.
increases from top to bottom within the group.
varies in an unpredictable way within the group.
decreases from top to bottom within the group.

24. The formation of an ionic bond involves the (1 point)transfer of electrons.
transfer of neutrons.
transfer of protons.
sharing of electrons.

25. In a polar covalent bond, (1 point)electrons are shared equally between atoms.
a cation is bonded to an anion.
electrons are transferred between atoms.
electrons are not shared equally between atoms.

26. Beryllium, Be, and chlorine, Cl, form a binary ionic compound with a one-to-two ratio of beryllium ions to chloride ions. The formula for the compound is (1 point)Be2Cl.
Be2Cl.
BeCl2.
Be2Cl2.

27. When magnesium carbonate, MgCO2, reacts with nitric acid, HNO3, magnesium nitrate and carbonic acid form. Carbonic acid then breaks down into water and carbon dioxide. Which two types of reactions take place in this process?

(1 point)synthesis and decomposition
single-replacement and combustion
double-replacement and decomposition
double-replacement and combustion

28. In terms of energy, how would you classify the following chemical reaction?

2Cu + O2 2CuO + 315 kJ (1 point)endothermic
exothermic
both endothermic and exothermic
neither endothermic nor exothermic

29. A log is burning in a fireplace. The combustion reaction requires oxygen as a reactant. If the amount of oxygen reaching the log is decreased, which of the following statements is true? (1 point)The reaction rate increases.
The reaction rate decreases.
The reaction rate remains the same.
The reaction rate depends only on the temperature.

30. A student dissolved equal amounts of salt in equal amounts of warm water, room-temperature water, and ice water. Which of the following is true? (1 point)The salt dissolved most quickly in the warm water.
The salt dissolved most quickly in the room-temperature water.
The salt dissolved most quickly in the ice water.
none of the above

31. A solution that contains more solute than it would normally hold at that temperature is said to be (1 point)saturated.
unsaturated.
supersaturated.
concentrated.

32. Which of the following is NOT a property of an acid? (1 point)tastes sour
usually reacts with a metal
changes the color of an indicator
feels slippery

33. A base is defined as a compound that produces (1 point)hydroxide ions in solution.
hydrogen ions in solution.
hydronium ions in solution.
sodium ions in solution.

Answer
I am not your science teacher. Even if i was, I would probably send you to detention.

How can I convert several small, battery operated lights to run from an ac outlet?

Erica

My girlfriend and I recently moved to Texas. Our apartment has a fireplace but we have no plans to use it to actually light fires. Instead of having a dark, black pit in our living room, she wants to use flameless candles to illuminate the area. Instead of switching some 20 odd candles on one at a time and using battery power to run them, we would like to wire all of the flameless candles together, in parallel, to a wall outlet so that we only have to flick the switch and we will have an instant fire in our fireplace, without using batteries at all.

I can handle splicing wires, it's just the details that get the better of me, i.e. math.

I know that I need an adapter, but I don't know how to determine what size adapter I need.

Once I figure out what size adapter, what measures can I take to allow me to add or take away lights from the circuit as I see fit?

At the moment we have 3 types of candles: the large type requires 3 double A batteries. The medium type come wired together in twos, They use 3volt batteries. The small uses a 3 volt battery as well.

I have access to a multimeter but I can't figure out how many amps something like this uses. Also, I am under the impression that while adapters have to be specific to the voltage, it's usually better to overestimate on current. Working under this presumption, would my circuit work if I were to find an adapter rated for my circuit's voltage but rated for the highest number of amps?

If someone could give me some instruction so that I know how to adjust my system in the future if I need to change anything, that would be awesome.

Thanks!

Answer
There's a far easier way.
Electric logs. Vintage one on sale for $15 now on EBAY.
It uses a 25 watt bulb.
No need to re-invent the wheel (or fire either!)
Here:http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=electric+log&_sacat=See-All-Categories

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