# Posts by Shay

Total # Posts: 416

**chemistry**

How much in $ is one MOLE of pennies?

**chemistry**

What two conditions necessary for molecules to be polar? Her's my answer pls check. First, at least one covalent bond in the molecule has to be a polar covalent bond. For a bond to be polar, there must be a difference in the electronegativities of the two atoms that are ...

**chemistry**

What is the complete ionic equation for the double displacement reaction: CuNO3(aq) + K2S(aq)= what is the chemical name and formula of this chemical reaction? plsss. need help

**Chemistry**

Would you expect a chemical change to be always accompanied by a physical change? Explain?

**Chemistry**

which sign of chemical reaction is not detectable by sight?

**chemistry**

when two solutions are mixed and a new color is observed is this color change an indication that a chemical reaction has occurred? Explain why?

**chemistry**

Reacting Mg with acid solution to form Mg salt and Hydrogen gas. What are the: 1.general reaction type 2. Chemical equation include phase 3. complete ionic equation include phase 4. chemical equation for the reaction between magnesium with water

**chemistry**

Hi DrBob222 i mean the evidence of the reaction pls

**chemistry**

decomposition of water to form elemental Hydrogen and Oxygen gas. What will be the balanced chemical equation, type of reaction and the driving force of the reaction?

**chemistry**

what is the gas formed when baking soda is added to vinegar? complete the reaction: NaHCO3(s) + CH3COOH(aq)

**chemistry**

Is there a gas formed if you heat a sugar? What will be its identity

**chemistry**

what is the lewis dot structure for BN

**chemistry**

Identify the following molecules as polar or nonpolar. 1. H2S 2. PBr3 3. SiCl4 4. SO2

**chemistry**

For each of the following bonds, indicate the positive end with \delta^{+} and the negative end with \delta^{-}. Write an arrow to show the dipole for each. 1. Si-Cl 2. Se-F 3. Br-F 4. N-H 5. N-P

**chemistry**

Write the formulas of the compounds formed Pb+4 with the following anions:OH-, NO3- , CO3(2-), HSO4- , PO4{3-} . Use the given order of anions.

**chemistry**

For each of the following bonds, indicate the positive end with \delta^{+} and the negative end with \delta^{-}. Write an arrow to show the dipole for each. 1. Si-Cl 2. Se-F 3. Br-F 4. N-H 5. N-P

**chemistry**

If the boron nitride molecule,BN, were to form, what would its structure look like? pls. need help

**chemistry**

thanks a lot DrBob222 you're such a big help

**chemistry**

is IBr a hydrogen bonding or dipole-dipole interactions or dispersion forces

**chemistry**

Write the formulas of the compound Al+3 formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

**chemistry**

Write the formulas of the compound Pb+4 formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

**chemistry**

Write the formulas of the compound Al3+ formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

**chemistry**

Write the formulas of the compound NH4+ formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

**chemistry**

The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample?

**chemistry**

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?

**chemistry**

Iodine-131, a beta emitter, has a half-life of 8 days.How many grams of a 10.0g sample of iodine-131 would remain after 56.0 days?

**chemistry**

When californium-249 is bombarded by oxygen-18, a new isotope and four neutrons are produced. Express your answer as a nuclear equation.

**chemistry**

Radon-222 undergoes alpha decay.what is the nuclear equation

**chemistry**

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?

**chemistry**

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals?

**math**

As an entrepreneur, there are going to be many decisions that you need to make, such as the price to charge your customers for your goods and services. You have just graduated from college and recently opened a specialty pizza restaurant. Based on surveys conducted in your ...

**chemistry**

thanks a lot big help

**chemistry**

The safe level of radon gas at home is 4X10e-12 Ci/L or less. If you measure radon levels in the basement what is the maximum number of Ci that could be safe to find in a basement with dimensions of 12 ft x 15 ft x 6 ft?

**chemistry**

It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

**chemistry**

if you are exposed to all sources of radiation from natural sources and human activities (worldwide average). How many years would it take for you to absorb a fatal dose of radiation plss help

**Science chemistry**

It takes 1 hour and 17 min. for a 1.000gsample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

**chemistry, i need help like a.s.a.p!!!!**

Volume= 3.1 x 4.6 x 1.9 = 27.094cm3 Density=mass/volume = 19.07g / 27.094 cm3 Density= 0.7038g/cm3 or 0.704g/cm3

**Chemistry**

Carbon-14 has a half-life of 5730 years In a plant fossil you find that the 14 C has decayed to 1/8 of the original amount how long ago was this plant

**Physics**

A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?

**Physics**

A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?

**Geometry**

idk

**math**

add or subtract the following polynomials as indicated (5.9x3 + 3.4x2 -7)-(2.9x3-9.6x2 +3)

**math**

tracy had coffee once a day, and the special blend she bought at Donna's Coffee Stop cost about $3.00 a cup. Max bought coffee at Donna's coffee stop twice a day. He bought several different types of special blends that cost $.400 a cup on average 3. Tracy and Max ...

**Math**

Find the remainder when 13^18 + 19^12 is divided by 247.

**Math**

what does x reduce to???? 6x=15(mod 21) 2x=5(mod 7) x= ?(mod)7

**Math**

What are the 3 solutions? I'm stuck! 6x=15(mod 21) a=6,m=21,b=15 d=gcd(6,21)=3 solns. 6x=15(mod 21) 2x=5(mod 7) 21=6(3)+3 6+3(2)+0 0=6-6 6-(21-6(3))=3 6-21+18=3 6( )-21()=3 (21-6(3))(15)-6=3 ???????

**Math**

Find the units digit in 23^7777 by looking for mod 10.

**Math**

Consider the congruence 6x=15(mod 21). How many solutions does the congruence have? What are all the solutions?

**math**

Round all answers to the nearest hundredth square root of b^2-4ac;b=3,a=-1,c=-2?

**math**

Round all answers to the nearest hundredth -5a^2;a=-2?

**world mythology**

What are the implied moral values of the Greek/roman underworld?

**world mythology**

What are the cultural assumptions of the greek/roman underworld?

**world mythology**

Identify the main characteristics of the Greek/roman underworld

**math116**

in some year election for the president there were 86.7 million voters,whereas in the next year there were 126.2 million voters. find the percent change in the number of voters.

**english language writing skills**

after a prolonged delay due to technical difficulties,the program resumed. identify the verb.

**English/Literature**

List the six people presented in this excerpt from Hiroshima. Besides surviving the explosion of the atomic bomb, what do they have in common?

**math**

Solve the equation: 6x^2+12x+5=0

**Geometry**

The ratio of the areas of two similar trapezoids is 1/9. What is th eratio of the lengths of their altitudes?

**math, trig**

Graph one period of the following function. Show all work . y=2sinx+2cosx

**mth, trig**

Thanks but how did you find that? My numbers came out completely different -_-

**mth, trig**

Given cos a=-7/25 in quadrant II , and sin b=-12/13, in quadrant IV , find cos(a+b) and sin2a

**Math**

Thank you soooo much!

**Math**

Damien sets up a bucket to catch rain drops the bucket can hold 1 gallon. If each raindrop is mae of about 1/90 fluid ounce of water,how many raindrops will the bucket be able to hold?

**math**

There are 12 inches in a foot and 36 inches in a yard, so if your are trying to find how many in a yard: 36 * 12 =

**geometry**

point A is located at (1,5) and point B is located at (3,2). What is the length of line segment AB in simplest radical form

**CHEMISTRY**

What happens to the NH4+ and Cl] ions when they enter the water? Does this process release or require energy?

**CHEMISTRY**

What happens to the NH4+ and Cl] ions when they enter the water

**math**

If anyone could answer this it would help me so much. (-36)(-5/-9) - (-20) = What do I do if there are two numbers with parentheses?

**math**

Thank you

**math**

What is -16 + -8 x -2 -(4-9)= ? I did it and got -72. I want to know if I'm right. I'm so confused with operations. Would you subtract the numbers and add, then multiply?

**math**

I knew it! Thanks

**math**

what is -3 x -3 x -3 x -3? My mom and I were having a debate and I think it's 81, but she thinks it -81. Which one of us is right?

**3 grade math**

They both intersect. Perpendicular lines intersect to form right angles, while intersecting lines just intersect. A right angle is 90 dergees. Any angle less than that is an acute angle. Any more is an obtuse angle and a straight line is 180›.

**cell crossword puzzle 14 across**

Golgi Complex

**Math**

It forms a triangle. I don't know what kind since I can't see the picture or angles.

**physics**

A tennis ball is thrown vertically upward with an initial velocity of +7.5 m/s. What will the ball’s velocity be when it returns to its starting point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s How long will the ball take to reach its starting ...

**physics**

A ﬂowerpot falls from a window sill 25.3 m above the sidewalk. What is the velocity of the ﬂowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s How much time does a passerby on the sidewalk below have to move out...

**math**

Monday is 4 hours.

**Math**

1/4 times 5 = 1/4 * 5/1 = 5/4, The improper fraction. The mixed number is 1 1/4.

**math**

Assuming that the large shirts are the adult shirts, then the person has a 5 out of 12 chance of getting one.

**Math; I really need help.**

The standard form would be x + y = -5. But, I am not sure if that is the same for multiplication.

**Math**

There are an abundance of answers for this question. I can tell you of one such as 6,000 + 7,000 + 4,491 because this is one of the easiest.

**Science 7R**

Unless that 79 is a 79.5 or higher than it is not good for an 80.

**geometry**

You forgot to give us the lenght of the side of the line that connects from the middle of the pentagon to a side of the pentagon.

**algebra**

If w = weeks, I would use the equation: $20 + 6w = $150 - $4w. You can than solve this by finding w.

**thunderstorms**

Thanks!

**Thunderstorms**

Can you suffer from memory-loss if you get hit by a lightning bolt?

**English**

Using the lists of possible answers, use the letters assigned to the characters/people to identify who would be the speaker of each of the following paraphrases/quotations: 1)I think we'll all be destroyed by the A-Bomb,so why should I care about anything? 2)We were dared ...

**English**

Which of these is the properly punctuated sentence? a)Ted went to work and Bob went home. b)Ted went to work; and Bob went home. c)Ted went to work. And Bob went home d)Ted went to work, and Bob went home. Would the correct answer be D?

**English**

supposed? The answer is A.

**English**

I think the answer is B

**English**

Which of the following is correct? a) We were supposed to go to the game today, but it rained. b)We were suppose to go to the game today, but it rained.

**English**

Which of the following is correct? a)Who's toothbrush is floating in the toilet? b)Whose going to Dairy Queen with me? c)Whose jacket is that? d)b&c I believe the answer is C

**English**

which of the following is an example of a fragment? A) When Ted went to work, Bob went home. B) Although Ted went to work and Bob went home. C) Bob went to work although Ted went to work. D) Although Ted went to work, Bob went home. I Think the answer is B.

**Aztecs**

could someone tell me more about the Aztecs. (Yes, I have checked google and I have some information). -Thanks, w/apprecation Shay

**African American History**

What European nations were the first to engage in trade talks with Africans

**algebra**

30/x+20/x-20=1

**math 11 grade**

How do you do this 5a+(9)-12e*5a+(3)

**Physics**

a car leaves skid marks 84 m long on the highway. Assuming a deceleration of 7.50 m/s2, estimate the speed of the car just before braking.