[sciencehelp]

Hello, I really need help with my homework. I really have a hard time with science and I try really hard. Can someone check if my answers are right? I tried the best of my ability to answer these so please help me out.
the star means the answer i think it is.



1. How many protons should be added to the nucler of oxygen atoms so the resulting gas will flow red when an electric current flows through it?
A. 1
B. Protons have to be subtracted not added.*
C. 4
D. 2
E. 3

2. One element is distinguished from another by number of
A. Protons
B. Neutrons
C. Electrons
D. All of the above.*

3. Which of these atoms has the greatest amount of electrical charge in its nucleus?
A. Carbon
B. Gold
C. Helium
D. Uranium*
E. Iron

4. Which of these atoms has the greatest number of electrons?
A. Helium
B. Uranium
C. Iron
D. Gold*
E. Carbon

5. Which of the following are electrically neutral?
A. Neutron*
B. Electron
C. Proton
D. All of the above
E. None of the above

6. Which is the smallest particle listed below?
A. A molecule*
B. A proton
C. An atom
D. A neutron
E. A quark

7. Solid matter is mostly empty space. The reason solids don't fall through another is because
A. Of gravitational forces
B. Of nuclear forces
C. Of electrical forces*
D. Atoms are constantly vibrating. Even at absolute zero
E. None of these

8. In an eletrically nuetral atom, the number of protons in the necleus is balanced by an equal number of
A. Quarks
B. Neutron*
C. Orbital electrons
D. All of these
E. None of these

9. What makes an element distinct?
A. The number of electrons
B. The number of neutrons
C. The number of protons
D. The total mass of all the particles *
E. None of these

10. The air in a normal room has?
A. Mass
B. Energy
C. Weight
D. All of these*
E. None of these

11. In a closed bottle are a certain number of hydrogen atoms. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen atoms. The bottle with the greatest number of atom is the one containing
A. Nitrogen*
B. Both the same
C. Hydrogen

12. If two protons are removed from an oxygen nucleus, the result is
A. Nitrogen
B. Neon
C. Carbon
D. Helium
E. None of these*

13. If a pair of helium nuclei are fused together, the result is
A. Lithium*
B. Beryllium
C. Heavy helium
D. All of these
E. None of these

14. If we doubled the magnifying power of the most powerful optical microscope in the world, we would
A. Be abke to see indiviual atoms
B. Still not be able to see an atom
C. Be able to photograph indiviual atoms even though we couldn't see them.*

15. In the periodic table, the metallord are found
A. Vertically to the left hand side
B. Vertically to the far right hand side*
C. Diagonally just right of the center
D. Horizontally below the main body

16. Browman motion has to do with the
A. Rhythmic movement of Brownians*
B. Atomic vibration
C. Random motions of atoms and molecules.
D. Size of atoms

17. The reason a granite block is mostly empty space is because of the atoms in the granite are
A. Not as close together as they could be
B. In perpetual motion
C. Invisable
D. Mostly empty space themselves
E. Held together by electrical forces*

18. Which of these atom has the most mass?
A. Lead*
B. Hydrogen
C. Iron
D. Uranium
E. All have the same mass

19. To change mercury into gold, a pair of protons must be
A. Added to the mercury nucleus
B. Removed from the mercury nucleus*
C. Both of these
D. Neither of these

20. Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
A. The same age*
B. Newer
C. Actually older

21. The inner transition metals are not listed in the main body of periodic table because they
A. Have properties that are unlike those of other atomic groups
B. Have masses that are much greater
C. Are all radioactive
D. Are set in the 8th and 9th period*

22. Transition metals are primilary used
A. As pigmentation in paints
B. For transforming metalloid into metals
C. For structural purpose
D. As fuel for nuclear reactors*

23. Nucler of atoms that make up a newvborn baby were made in
A. The food the mother eat before giving birth
B. The mother's womb
C. Ancient stars
D. The earth*
E. None of these

24. How many different elements are in the water molecule?
A. 4*
B. 2
C. 1
D. 3
E. None of these

25. What is the total number of protons and neutrons are in a water molecule
A. 10
B. 15
C. 12*
D. 18
E. None of these

26. Compared to the energy it takes to seperate oxygen and hydrogen from water, the amount of energy given off when they recombine is
A. The same*
B. More
C. Less

27. Which type of solid would gave the greatest tendecy to shatter upon impact with a hammer
A. A metalloid
B. An inner transition element
C. A nonmetal*
D. A metal

28. A radioactive isotope of strontium, SR, is especially dangerous to humans because if its tends to accumulate in the bone marrow tissues, Hiw does this relate to the organization of the periodic table?
A. Strontium is over twice as massive as calcium
B. Compared to calcium, strontium has an additional 18 electrons and cause harm
C. Strontium and calcium are in the same atomic group, hence they have similar physical and chemical properties.*
D.Strontium and calcium are in the same atomic period, hence they have similar physical and chemical properties.

29. If two protons are added to an oxygen nucleus, the result is
A. Nitrogen*
B. Sodium
C. Fluorine
D. Heavy oxygen
E. Neon

30. If one neutron is added to a helium nucleus, the result is
A. hydrogen
B. boron
c. beryvillium *
D. helium
e. lithium

31. there are about as many atoms of air in your lungs at any momeny as there are breaths in air in the atmosphere of
A. the whole world*
b. a large city
c. a large auditorium
d. the u.s
e. none of these

32. assuming all the atoms exhaled by julius caesar in his last dying breaths are still in the atmosphere, then we probably breathe one of those atoms with each
A. single breath*
B. day

33. which has the greatest number of protons in its nucleus?
a. silver
b. lead
c. gold
d. mercury*

34. an atom has
a. structure
b. mass
c. energy
d. all of these*
e. none of these

35. atoms heavier than hydrogen were made by
a. nuclear fusion*
b. radioactivity
c. phtosynthesis
d. radiant energy conversion
e. none of these

36. if an element of atomic number 118 is ever synthesized, it would be
a. a gas at room temperature
b. radioactive
c. chemically inert
d. all of these*

37. which of the following statement is true?
a. there are thousands of different kinds of atoms that account for a wide variety of substances*
b. there are only about 100 diffrent kind of atoms that combine to form all substances
c. atoms are so small that there is no way we can photograph them
d. an atom is the smallest particle know to exist
e. none of these are true

38. compared to the mass of a hydrogen atom, the mass of an oxygen atom is
1. 16 times greater
b. appreciable more than 16 times greater*
c. 8 times greater
d. 12 times greater

39 which of tjese forces determines the chemical properties of an atom?
a. electrical force
b. nuclear force
c. gravitational force
d. friction force
e. none of these*

[ecoli]

sciencehelp said:

2. One element is distinguished from another by number of
A. Protons
B. Neutrons
C. Electrons
D. All of the above.*

nope, it's determined by number of protons. Neutron and electron number can vary, sometimes greatly.

Quote

6. Which is the smallest particle listed below?
A. A molecule*
B. A proton
C. An atom
D. A neutron
E. A quark

A molecule, consisting of multiple atoms, would actually be the biggest particle listed here.

Quote

7. Solid matter is mostly empty space. The reason solids don't fall through another is because
A. Of gravitational forces
B. Of nuclear forces
C. Of electrical forces*
D. Atoms are constantly vibrating. Even at absolute zero
E. None of these

nope

Quote

8. In an eletrically nuetral atom, the number of protons in the necleus is balanced by an equal number of
A. Quarks
B. Neutron*
C. Orbital electrons
D. All of these
E. None of these

Neutrons are electrically neutral, and don't contribute to charge. Protons are positive and so must be balanced by a negative charge.

Quote

9. What makes an element distinct?
A. The number of electrons
B. The number of neutrons
C. The number of protons
D. The total mass of all the particles *
E. None of these

wrong, different atoms can be found with various masses and are still considered the same element.

Quote

12. If two protons are removed from an oxygen nucleus, the result is
A. Nitrogen
B. Neon
C. Carbon
D. Helium
E. None of these*

Oxygen has 6 protons. If you somehow removed two, you have four. Which, by definitiong is carbon.

Quote

16. Browman motion has to do with the
A. Rhythmic movement of Brownians*
B. Atomic vibration
C. Random motions of atoms and molecules.
D. Size of atoms

http://en.wikipedia....Brownian_motion
the answer you picked is actually kind of funny.

Quote

17. The reason a granite block is mostly empty space is because of the atoms in the granite are
A. Not as close together as they could be
B. In perpetual motion
C. Invisable
D. Mostly empty space themselves
E. Held together by electrical forces*

D


I don't have time to look at all of these, but they all can be found using google search, or directly from wikipedia. This is pretty basic stuff you should be able to find out for yourself. (PS - it helps if you don't wait until the last minute.)

[Klaynos]

sciencehelp said:

Hello, I really need help with my homework. I really have a hard time with science and I try really hard. Can someone check if my answers are right? I tried the best of my ability to answer these so please help me out.
the star means the answer i think it is.



1. How many protons should be added to the nucler of oxygen atoms so the resulting gas will flow red when an electric current flows through it?
A. 1
B. Protons have to be subtracted not added.*
C. 4
D. 2
E. 3

Someone else will have to check this I can't check atm, sorry

sciencehelp said:

2. One element is distinguished from another by number of
A. Protons
B. Neutrons
C. Electrons
D. All of the above.*

Nope, one is elements, one is ionisation, and one is isotopes.

sciencehelp said:

3. Which of these atoms has the greatest amount of electrical charge in its nucleus?
A. Carbon
B. Gold
C. Helium
D. Uranium*
E. Iron

I think that's right

sciencehelp said:

4. Which of these atoms has the greatest number of electrons?
A. Helium
B. Uranium
C. Iron
D. Gold*
E. Carbon

Don't think so.

sciencehelp said:

5. Which of the following are electrically neutral?
A. Neutron*
B. Electron
C. Proton
D. All of the above
E. None of the above

Looks about right.

sciencehelp said:

6. Which is the smallest particle listed below?
A. A molecule*
B. A proton
C. An atom
D. A neutron
E. A quark

Nope....

sciencehelp said:

7. Solid matter is mostly empty space. The reason solids don't fall through another is because
A. Of gravitational forces
B. Of nuclear forces
C. Of electrical forces*
D. Atoms are constantly vibrating. Even at absolute zero
E. None of these

I would say this depends on the scale you're looking at. You're probably correct.

sciencehelp said:

8. In an eletrically nuetral atom, the number of protons in the necleus is balanced by an equal number of
A. Quarks
B. Neutron*
C. Orbital electrons
D. All of these
E. None of these

Nope, you've already said the neutron is neutral it's got to counter the +ve charge of the protons...

sciencehelp said:

9. What makes an element distinct?
A. The number of electrons
B. The number of neutrons
C. The number of protons
D. The total mass of all the particles *
E. None of these

Nope, sorry, the mass can be cahnged by changing the isotope... Have a quick read of:


http://en.wikipedia....hemical_element

sciencehelp said:

10. The air in a normal room has?
A. Mass
B. Energy
C. Weight
D. All of these*
E. None of these

Looks right to me...


And now I must get back to my revision!

[Cap'n Refsmmat]

sciencehelp said:

2. One element is distinguished from another by number of
A. Protons
B. Neutrons
C. Electrons
D. All of the above.*

Actually, I believe it is protons. Remember that isotopes are composed of the same element with different numbers of neutrons, and ions are the same element with different numbers of electrons. It is protons that matter.

Quote

4. Which of these atoms has the greatest number of electrons?
A. Helium
B. Uranium
C. Iron
D. Gold*
E. Carbon

Check the periodic table on that one.

Quote

6. Which is the smallest particle listed below?
A. A molecule*
B. A proton
C. An atom
D. A neutron
E. A quark

Whoa there. Smallest particle. Remember that molecules are made of atoms, and so on. Go back and check that one.

Quote

8. In an eletrically nuetral atom, the number of protons in the necleus is balanced by an equal number of
A. Quarks
B. Neutron*
C. Orbital electrons
D. All of these
E. None of these

Are you sure? Remember that you answered above that neutrons have no charge. How can they balance out a charge if they have none themselves?

Quote

9. What makes an element distinct?
A. The number of electrons
B. The number of neutrons
C. The number of protons
D. The total mass of all the particles *
E. None of these

Remember what I said about question 2.

Quote

12. If two protons are removed from an oxygen nucleus, the result is
A. Nitrogen
B. Neon
C. Carbon
D. Helium
E. None of these*

Take a look at your periodic table, and remember question 2. What element has two less protons than oxygen?

Quote

16. Browman motion has to do with the
A. Rhythmic movement of Brownians*
B. Atomic vibration
C. Random motions of atoms and molecules.
D. Size of atoms

Heh. Sorry, you might want to look that up.

Quote

17. The reason a granite block is mostly empty space is because of the atoms in the granite are
A. Not as close together as they could be
B. In perpetual motion
C. Invisable
D. Mostly empty space themselves
E. Held together by electrical forces*

Is E a reason that they're empty space, or just a fact about the atoms?

Quote

18. Which of these atom has the most mass?
A. Lead*
B. Hydrogen
C. Iron
D. Uranium
E. All have the same mass

Check your periodic table.

Quote

22. Transition metals are primilary used
A. As pigmentation in paints
B. For transforming metalloid into metals
C. For structural purpose
D. As fuel for nuclear reactors*

Nuclear reactor fuel is mostly plutonium and uranium, not transition metals in general.

Quote

23. Nucler of atoms that make up a newvborn baby were made in
A. The food the mother eat before giving birth
B. The mother's womb
C. Ancient stars
D. The earth*
E. None of these

Sure?

Quote

24. How many different elements are in the water molecule?
A. 4*
B. 2
C. 1
D. 3
E. None of these

Remember what water is: hydrogen and oxygen.

Quote

29. If two protons are added to an oxygen nucleus, the result is
A. Nitrogen*
B. Sodium
C. Fluorine
D. Heavy oxygen
E. Neon

Remember question two, and use a periodic table.

Quote

30. If one neutron is added to a helium nucleus, the result is
A. hydrogen
B. boron
c. beryvillium *
D. helium
e. lithium

Remember question 2.

Quote

33. which has the greatest number of protons in its nucleus?
a. silver
b. lead
c. gold
d. mercury*

Remember that atomic number = number of protons.

Quote

37. which of the following statement is true?
a. there are thousands of different kinds of atoms that account for a wide variety of substances*
b. there are only about 100 diffrent kind of atoms that combine to form all substances
c. atoms are so small that there is no way we can photograph them
d. an atom is the smallest particle know to exist
e. none of these are true

There are only around 100 different elements...


Note that I'm not giving you the answers, only help. I also didn't answer all of the questions, as some were correct and some I just don't know.

Just remember these basic facts:

• The periodic table is organized by atomic number, which is the number of protons in the nucleus of an atom.
  
• Adding protons gives you a new atom.
  
• Adding neutrons or electrons just gives you a new isotope or ion of that same element, respectively.
  
• Atomic mass is also listed on the periodic table for your enjoyment.

Good luck.

[sciencehelp]

Thx for the help guys!

[ecoli]

Klaynos said:

I would say this depends on the scale you're looking at. You're probably correct.

I have to disagree with you on that one, Klaynos. Electrical forces are generated by electron flow, but atoms are held together (and apart) individually by intramolecular strong and weak forces. My guess is that the correct answer is "nuclear forces"

[sciencehelp]

Which 1 is it? I am pretty sure its electrical force though... can anyone verifty this?

[sciencehelp]

Hello, After all of the help I have gotten from you guys, The results that I have got is here.



1. How many protons should be added to the nucler of oxygen atoms so the resulting gas will flow red when an electric current flows through it?
A. 1
B. Protons have to be subtracted not added.*
C. 4
D. 2
E. 3

2. One element is distinguished from another by number of
A. Protons*
B. Neutrons
C. Electrons
D. All of the above.

3. Which of these atoms has the greatest amount of electrical charge in its nucleus?
A. Carbon
B. Gold
C. Helium
D. Uranium*
E. Iron

4. Which of these atoms has the greatest number of electrons?
A. Helium
B. Uranium
C. Iron
D. Gold*( not sure about this)
E. Carbon

5. Which of the following are electrically neutral?
A. Neutron*
B. Electron
C. Proton
D. All of the above
E. None of the above

6. Which is the smallest particle listed below?
A. A molecule
B. A proton
C. An atom
D. A neutron
E. A quark*

7. Solid matter is mostly empty space. The reason solids don't fall through another is because
A. Of gravitational forces
B. Of nuclear forces
C. Of electrical forces*
D. Atoms are constantly vibrating. Even at absolute zero
E. None of these

8. In an eletrically nuetral atom, the number of protons in the necleus is balanced by an equal number of
A. Quarks
B. Neutron
C. Orbital electrons*
D. All of these
E. None of these

9. What makes an element distinct?
A. The number of electrons
B. The number of neutrons
C. The number of protons*
D. The total mass of all the particles
E. None of these

10. The air in a normal room has?
A. Mass
B. Energy
C. Weight
D. All of these*
E. None of these

11. In a closed bottle are a certain number of hydrogen atoms. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen atoms. The bottle with the greatest number of atom is the one containing
A. Nitrogen
B. Both the same
C. Hydrogen*

12. If two protons are removed from an oxygen nucleus, the result is
A. Nitrogen
B. Neon
C. Carbon*
D. Helium
E. None of these

13. If a pair of helium nuclei are fused together, the result is
A. Lithium
B. Beryllium*
C. Heavy helium
D. All of these
E. None of these

14. If we doubled the magnifying power of the most powerful optical microscope in the world, we would
A. Be abke to see indiviual atoms
B. Still not be able to see an atom*
C. Be able to photograph indiviual atoms even though we couldn't see them.

15. In the periodic table, the metallord are found
A. Vertically to the left hand side
B. Vertically to the far right hand side*( This is a tricky question because it can also be C)
C. Diagonally just right of the center
D. Horizontally below the main body

16. Browman motion has to do with the
A. Rhythmic movement of Brownians
B. Atomic vibration
C. Random motions of atoms and molecules.*
D. Size of atoms

17. The reason a granite block is mostly empty space is because of the atoms in the granite are
A. Not as close together as they could be
B. In perpetual motion
C. Invisable
D. Mostly empty space themselves*
E. Held together by electrical forces

18. Which of these atom has the most mass?
A. Lead
B. Hydrogen
C. Iron
D. Uranium*
E. All have the same mass

19. To change mercury into gold, a pair of protons must be
A. Added to the mercury nucleus
B. Removed from the mercury nucleus
C. Both of these
D. Neither of these*

20. Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
A. The same age*
B. Newer
C. Actually older

21. The inner transition metals are not listed in the main body of periodic table because they
A. Have properties that are unlike those of other atomic groups*
B. Have masses that are much greater
C. Are all radioactive
D. Are set in the 8th and 9th period

22. Transition metals are primilary used
A. As pigmentation in paints
B. For transforming metalloid into metals
C. For structural purpose*
D. As fuel for nuclear reactors

23. Nucler of atoms that make up a newvborn baby were made in
A. The food the mother eat before giving birth
B. The mother's womb
C. Ancient stars*
D. The earth
E. None of these

24. How many different elements are in the water molecule?
A. 4
B. 2*
C. 1
D. 3
E. None of these

25. What is the total number of protons and neutrons are in a water molecule
A. 10
B. 15
C. 12
D. 18*
E. None of these

26. Compared to the energy it takes to seperate oxygen and hydrogen from water, the amount of energy given off when they recombine is
A. The same*
B. More
C. Less

27. Which type of solid would gave the greatest tendecy to shatter upon impact with a hammer
A. A metalloid
B. An inner transition element
C. A nonmetal*
D. A metal

28. A radioactive isotope of strontium, SR, is especially dangerous to humans because if its tends to accumulate in the bone marrow tissues, Hiw does this relate to the organization of the periodic table?
A. Strontium is over twice as massive as calcium
B. Compared to calcium, strontium has an additional 18 electrons and cause harm
C. Strontium and calcium are in the same atomic group, hence they have similar physical and chemical properties.*
D.Strontium and calcium are in the same atomic period, hence they have similar physical and chemical properties.

29. If two protons are added to an oxygen nucleus, the result is
A. Nitrogen
B. Sodium
C. Fluorine
D. Heavy oxygen
E. Neon*

30. If one neutron is added to a helium nucleus, the result is
A. hydrogen
B. boron
c. beryvillium
D. helium*
e. lithium

31. there are about as many atoms of air in your lungs at any momeny as there are breaths in air in the atmosphere of
A. the whole world*
b. a large city
c. a large auditorium
d. the u.s
e. none of these

32. assuming all the atoms exhaled by julius caesar in his last dying breaths are still in the atmosphere, then we probably breathe one of those atoms with each
A. single breath
B. day*

33. which has the greatest number of protons in its nucleus?
a. silver
b. lead*
c. gold
d. mercury

34. an atom has
a. structure
b. mass
c. energy
d. all of these*
e. none of these

35. atoms heavier than hydrogen were made by
a. nuclear fusion*
b. radioactivity
c. phtosynthesis
d. radiant energy conversion
e. none of these

36. if an element of atomic number 118 is ever synthesized, it would be
a. a gas at room temperature
b. radioactive
c. chemically inert
d. all of these*

37. which of the following statement is true?
a. there are thousands of different kinds of atoms that account for a wide variety of substances
b. there are only about 100 diffrent kind of atoms that combine to form all substances*
c. atoms are so small that there is no way we can photograph them
d. an atom is the smallest particle know to exist
e. none of these are true

38. compared to the mass of a hydrogen atom, the mass of an oxygen atom is
A.16 times greater*
b. appreciable more than 16 times greater
c. 8 times greater
d. 12 times greater

39 which of tjese forces determines the chemical properties of an atom?
a. electrical force*(This is another tricky 1 .. this can be either A or B)
b. nuclear force
c. gravitational force
d. friction force
e. none of these

[Cap'n Refsmmat]

I've moved this back into the original thread so things are clearer.

[sciencehelp]

Anyone wants to correct me? lol

[Rocket Man]

this isn't all the current mistakes, but the list is shrinking.

#1 doesn't neon glow red at electrical breakdown?
#4 neutral atoms, the one with the greatest number of protons.
#11 ideal gas laws, both diatomic, both at STP, both equal.
#36 the trend is towards solid, reactive and unstable
#39 nuclear holds the atom together, it can't quite reach to effect other nuclei.

[Bluenoise]

ecoli said:

I have to disagree with you on that one, Klaynos. Electrical forces are generated by electron flow, but atoms are held together (and apart) individually by intramolecular strong and weak forces. My guess is that the correct answer is "nuclear forces"

The answer they're looking for is electric force. Or the electromagnetic repulsion between the electron shells.

[ecoli]

Bluenoise said:

The answer they're looking for is electric force. Or the electromagnetic repulsion between the electron shells.

oh yeah, for some reason I was thinking electricity, which isn't the same. Thanks.

[Rocket Man]

this thread is beginning to look unweildly, can the spaghetti be disciplined?