Please help me with science!?

Horse Girl

2010-03-10 21:34:39 UTC

1.

A group of covalently bonded atoms that acts together as one charged atom is a ____.

• negative ion

• polyatomic ion (correct answer, your response)

• molecule

• crystal?

Points earned: 5 out of 5

2.

The oxidation number of an atom is shown with a ____?

• negative number ( wrong)

• superscript

• positive number (wrong)

• subscript

Points earned: 0 out of 5

3.

The elements that make up a compound and the exact number of atoms of each element in a unit of the compound can be shown in a ____.

• superscript

• chemical formula?

• chemical symbol (correct answer, your response)

• subscript

Points earned: 5 out of 5

4.

The ____ tells you how many electrons an atom must gain, lose, or share to become stable?

• atomic mass

• atomic number

• ionic number

• oxidation number (correct answer, your response)

Points earned: 5 out of 5

5.

Why do the noble gases NOT form compounds readily?

• They have no electrons.

• They have seven electrons in the outer energy levels.

• Their outer energy levels are completely filled with electrons. (correct answer, your response)

• They have empty outer energy levels.

Points earned: 5 out of 5

6.

In a chemical formula, the number of each type of atom in the compound is shown by numbers called ____?

• oxidation numbers

• chemical symbols

• superscripts

• subscripts (Correct answer)

Points earned: 0 out of 5

7.

A chemical bond that occurs when atoms share electrons is a(n) ____ bond?

• magnetic

• covalent (correct answer, your response)

• ionic

• polyatomic

Points earned: 5 out of 5

8.

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 4

• 2

• 8 (correct answer, your response)

• 6

Points earned: 5 out of 5

9.

The sum of the oxidation numbers in a neutral compound is always ____?

• zero (correct answer, your response)

• a negative number

• a positive number

• one

Points earned: 5 out of 5

10.

What is the correct formula for magnesium oxide (Mg+2 and O-2)?

• Mg2O

• MgO2

• MgO (correct answer, your response)

• Mg2O2

Points earned: 5 out of 5

2010-03-10 20:12:43 UTC

I see you're cheating on the quia quiz too?

Well I got the first few answers:

The sum of the oxidation numbers in a neutral compound is always ____?

• one

• zero (correct answer, your response)

• a negative number

• a positive number

Points earned: 5 out of 5

A group of covalently bonded atoms that acts together as one charged atom is a ____.

• negative ion

• molecule

• polyatomic ion (correct answer, your response)

• crystal?

Points earned: 5 out of 5

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 2

• 6

• 8 (correct answer, your response)

• 4

Points earned: 5 out of 5

What is the correct formula for magnesium oxide (Mg+2 and O-2)?

• Mg2O2

• MgO2

• Mg2O

• MgO (correct answer, your response)

Points earned: 5 out of 5

Why do the noble gases NOT form compounds readily?

• They have empty outer energy levels.

• They have no electrons.

• They have seven electrons in the outer energy levels.

• Their outer energy levels are completely filled with electrons. (correct answer, your response)

♥(:Sum girl:)♥

2010-03-10 20:59:42 UTC

Hahah hi guys! Its maddie, 2nd per right?:)

This quiz was harder.. but I think I got most the answers...

These were my results, I got two wrong.

The sum of the oxidation numbers in a neutral compound is always ____?

• a positive number

• zero (correct answer, your response)

• one

• a negative number

Points earned: 5 out of 5

The ____ tells you how many electrons an atom must gain, lose, or share to become stable?

• oxidation number (correct answer, your response)

• ionic number

• atomic number

• atomic mass

Points earned: 5 out of 5

A chemical bond that occurs when atoms share electrons is a(n) ____ bond?

• polyatomic

• ionic

• magnetic

• covalent (correct answer, your response)

Points earned: 5 out of 5

The oxidation number of an atom is shown with a ____?

• superscript

• negative number

• positive number

• subscript (your response) WRONG. :(

Points earned: 0 out of 5

What is the correct formula for magnesium oxide (Mg+2 and O-2)?

• Mg2O2

• MgO2

• Mg2O

• MgO (correct answer, your response)

Points earned: 5 out of 5

The elements that make up a compound and the exact number of atoms of each element in a unit of the compound can be shown in a ____.

• chemical symbol

• chemical formula? (your response) WRONG. :(

• subscript

• superscript

Points earned: 0 out of 5

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 8 (correct answer, your response)

• 6

• 4

• 2

Points earned: 5 out of 5

In a chemical formula, the number of each type of atom in the compound is shown by numbers called ____?

• oxidation numbers

• chemical symbols

• superscripts

• subscripts (correct answer, your response)

Points earned: 5 out of 5

A group of covalently bonded atoms that acts together as one charged atom is a ____.

• crystal?

• negative ion

• polyatomic ion (correct answer, your response)

• molecule

Points earned: 5 out of 5

Why do the noble gases NOT form compounds readily?

• They have seven electrons in the outer energy levels.

• Their outer energy levels are completely filled with electrons. (correct answer, your response)

• They have no electrons.

• They have empty outer energy levels.

Points earned: 5 out of 5

?

2016-05-31 02:23:19 UTC

You sound like me when i was 16. ^_^ Jobs for biology: any type of Medical Doctor, but this requires 4 years of undergraduate school, at least six years of post graduate school and then years of internships Clinical Research, which involves working with pharmaceutical companies to develope and test experiment drugs that haven't been approved by the FDA to sell in the market yet. There are all different kinds of stages of clinical research from the initial testing on animals, all the way through to the drug being on the market for people and reevaluating it for further benefits. There is also just any type of scientist, from digging up dinosaur bones as a paleontologist or studying weather patterns as a metiorologist. You have to narrow it down to what type of science you like the best. There are a lot of Ivy League schools that have great biology programs, like Penn U, Princeton and UMDNJ. Find out what colleges your science teachers attended and if they liked the programs. Also, go to college fairs and sign up to receive info in the mail. You'll receive piles and piles of college stuff in the mail, but take a Saturday afternoon and go through all of them. Anything that looks like it would be strong in science, look them up on the internet for more information. To get into a good college, take as many science classes in high school as you can. Most high schools will give students the standard curriculum: 1 math, 1 science, 1 social studies and 1 english/literature. However, when you get to your junior and senior year, you can usually opt out of some classes and take additional science classes instead of something like a foreign language or phyis ed. my 11th grade year I took biology and chemistry and then in 12th grade I took AP biology and physics. You may think, "but i'm not interested in chem or physics." but, in college with a biology major you'll be required to take upper level chem and some physics classes to graduate. Having a strong background in these classes will aid you in getting accepted into college. Also, find out if there are any science fairs you can participate in locally. Even if you don't win, that's still bonus points on your application. And, of course, apply early! Take your SATs junior year and apply before the end of your junior year. Early acceptance is a big plus. Also, apply to at least four schools. hmmm, fun facts, eh? Let's see.... -Look up a guy named Phineas Gage. Interesting story. -your brain is the size of a grapefruit and your heart is the size of your fist. -there are 206 bones in the adult human body, but 300 when we are children. Many of our bones fuse together as we get older -the more bumpy your brain is, the smarter you are. Its all about surface area. -the smallest bone in your body is in your inner ear -the longest cell in your body is your motor neuron that can stretch from your big toe to your lower spinal cord -the most poisonous animal in the world is a frog in south america -the stegosaurus was over 25 feet long, but had a brain smaller than a golfball -the human eye blinks over 4 millions times per year -it takes about 12 hours for food to entirely digest -the longest living cells in the body are neurons, which can last your whole life. However, neuron cells cannot regenerate or replicate, so once they die, there is no going back -there is more computer technology in a Nintendo game system (the ones from the 1980s) than in the Hubble Space Telescope. -the average human brain weighs 3 lbs, but the heaviest ever recorded was over 5lbs -plants "lean" towards a sunny window because the lack of sunlight on the dark side of the plant causes a reaction that makes the cells swell. The plant is not "leaning towards the light" on purpose.