A light green powder is heated in a test tube. A gas is given off, while the solid becomes black. In which classification of matter does the green powder belong?
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chemistry
A light green powder is heated in a test tube. A gas is given off, while the solid becomes black. In which classification of matter does the green powder belong? Explain your reasoning. 
science
A light green powder is heated in a test tube. A gas is given off and the solid becomes black. In which classification of matter does the green powder belong? Explain your reasoning. 
Chem 100 Lab
A black solid is heated in a tube that is completely evacuated of air. Hydrogen is added to the tube. An orange powder is formed and water vapor is seen on the outside of the tube. Is the original solid an element or compound? Can you identify the chemical? 
Science
* P is a a black powder, which, when fused with a mixture of potassium hydroxide and potassium nitrate and then treated with water yields a green solution. The green solution turn purple when acidified. identify P, the green solution and purple solution. write ionic equation... 
chemistry
A scientist is performing an experiment on a powder. Which of the following is a sign that a chemical change has definitely occurred during his experiment? The powder catches on fire. The powder releases bubbles. The powder heats up. The powder breaks apart into smaller ... 
Chemistry
Joseph Priestly discovered oxygen when he heated a red powder. This red powder had been prepared by heating mercury in air. a) name th red powder formed when this element is heated in air b) write a word equation to show what happens to this red powder when it is strongly ... 
chemistry
A student adds .137 grams of nickel(II) hydroxide powder to 10.0 L of distilled water at 25C with vigorous stirring. Did all of the powder dissolve? If not, how much powder remains undissolved? If so, how much more powder can be dissolved before a saturated solution is reached... 
chemistry
Q: I just did an online chemisty lab for Oxidation States of Manganese and I'm stuck. I have three test tubes that have been prepared as follows: Tube 1 Starting PH 13.82 2 mL of KMnO4 1 mL of NaOH Tube 2 Starting PH 7 2 mL of KMnO4 Tube 3 Starting PH 0 2 mL of KMnO4 1 mL ... 
5 g vial
A 5 g igal reguires addinng 8.6 ml diluent to get concentration of 250 mg/ml. The powder volume is __ ml a.9.3 b.10.6 c.11.4 d.12.8 Does the powder form a solution or a colloid? IT makes a big difference. In solutions, the sum of the powder volume and the solvent volume seldom... 
ap chemistry
A powder has a mass of 40.0g. When the powder is added to 30.0mL of water, the total volume is 45.0mL. What is the density of the powder 
Chemistry (again)
I need help with this question: Suppose you bake two cakes and the the one with twice as much baking powder raises twice as much. Is this proof of the relation between concentration and reaction rate? See I know concentration has an affect on reaction rate but I am not sure if... 
chemistry
Why is filter paper a poor material on which to powder a solid before introducing it into a melting tube? 
science
Why is filter paper a poor material on which to powder a solid before introducing it into a melting tube? 
science here is the worksheet someone help me
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work... 
Organic Chemistry
Hello! I was looking for some advice on my organic chemistry lab. We were supposed to separate and identify a solid mixed into a liquid. I found and have confirmed my liquid is acetone by distilling it out of the solid. The solid then turned into a whitish powder while in the ... 
math algebra 8
Jim creates mixtures for new candies. His boss gives him 20 pounds of 12% milk powder, and 32 pound of 20% milk powder. How many pounds of 12% milk powder jim uses if Boss wants him make 30 pounds of 18% milk powder for candies. Please help to answer , and formula also thanks 
Chemistry
Please can anyone help me with the following: Filter paper is a poor material on which to powder a solid before introducing it into a melting tube. Why? Thank you! 
science (chemistry)
filter paper is a poor material on which to powder a solid before introducing it into a melting tube .explain why? 
MATHS
ROSE USES INSTANT LEMONADE POWDER TO MAKE 7 PITCHERS OF LEMONADE .SHE USES 2/8 CUP OF POWDER FOR EACH PITCHER.WHAT IS THE AMOUNT OF POWDER THAT ROSES USES 
Organic Chemistry
Please can anyone help me with the following: Filter paper is a poor material on which to powder a solid before introducing it into a melting tube. Why? Thank you! 
Chemistry
A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. How do I find their amounts? 
chemistry
To analyze for barium in an unknown white powder, an excess of sodium sulfate solution was added to a 0.576 g sample of the powder dissolved in water. A white precipitate of BaSO4 was isolated, dried, and found to weigh 0.438 g. What is the mass percent of Ba in the white ... 
physics
Let's say you're driving in your car, approaching a red light on the Camp Hill Bypass. A black Porsche is stopped at the light in the right lane, but there's noone in the left lane, so you pull into the left lane. You're traveling at 40 km/hr, and when you're 15 meters from ... 
English
The green light is on. Let's walk across. The green light is on. Let's walk across the street. The green light is on. Let's walk across on the crosswalk. The green light is on. Let's walk across from the sidewalk. Are the sentences above all grammatical? If not, would you ... 
science help needed.
each statement is false. rewrite each one as a true statement,showing as much scientific understand as possible. 1. light waves travel slower than sound waves. 2.a black object will reflect white light. 3.a translucent object lets no light through. 4.an orange object will ... 
Math
Here's a chalenging one that i can't do at all. A deck of cards has 6 yellow, 6 green, and 5 black cards. You pick four cards from the deck. Cards are not returned after they are picked. What's the probability of picking first not green, second not green, third not black, ... 
Biology
The observed distribution of offspring was: blackred 1,070; blackwhite 177; greenred 180; greenwhite 1,072. Based on these data, what is the recombination frequency? A. 86% B. 7% C. 17% D. 14% E. 30% Background Info: In a particular species of mammal, black hair (B) is ... 
Chemistry
Purple light in the visible region of the electromagnetic spectrum has a shorter wavelength than does the green region of the spectrum. Which of the following can you conclude? Is it: a)a photon of purple light has a higher frequency than does a photon of green light or b) ... 
check/bio!!!!
okay the question is as follows: Three plants are placed in 3 different terrariums in 3 different light conditions. Plant A is placed in blue light, plant B in green light, and plant C in yellow light. In which case will there be an increase in the oxygen content of terrarium... 
Mathematics
A shopkeeper mixed coffee powder worth $2.50 per kg with coffee powder worth $3.50 per kg, and sold 20 kg of the mixture at $2.80 per kg. Find the weights of the 2 grades of coffee powder that he mixed together. Explain clearly your steps of solving it. 
chemistry
Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and shown ... 
Juba Day SS
ii) A box contains 10 white, 7 black and 3 green balls. 2 balls are drawn at random. Find out the probability that: a) both are white b) one is white and another is green c) one is black and another is green 
basic mathematics
ii) A box contains 10 white, 7 black and 3 green balls. 2 balls are drawn at random. Find out the probability that: a) both are white b) one is white and another is green c) one is black and another is green 
Physics
A blue car pulls away from a red stoplight just after it has turned green with a constant acceleration of 0.2 m/s2. A green car arrives at the position of the stoplight 7.5 s after the light had turned green. What is the slowest constant speed which the green car can ... 
physics
A blue car pulls away from a red stoplight just after it has turned green with a constant acceleration of 0.2 m/s2. A green car arrives at the position of the stoplight 7.5 s after the light had turned green. What is the slowest constant speed which the green car can ... 
Absorption spectra of pigments
On the graph light absorption in % vs wavelength, how come the color of chlorophyll is green? Since this is an absorption spectra, isn't it supposed to absorb blue and red and not green? Rather, it reflects green??? How would the graph be different if it is a reflection ... 
Physical Science
In which of these cases does a ripe banana apear black, red light/green light or blue light? Why? 
Basic Chemistry (Science)
Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy explanations and shown ... 
Chemistry
1. Tube # 3: (a) It started out as purple, and turned into green. (b) No precipitate was noticably formed. Tube #4: (a) This tube was purple, and turned into white. (b) A brown precipitate was formed after adding 1 mL of NaHSO3. Tube #5: (a) This tube was also purple, but then... 
Science
A green leaf is reflecting a. no light b. red light c. green light d. all light C 
Chemistry
I need another hypothesis: Mom and I were baking a cake for my brother's birthday. We didn't have any baking powder. The recipe said to add one teaspoon of baking powder to the cake batter. Since that's such a small amount we baked the cake anyway. We were very disappointed ... 
Math Prob/solving
As Frank drives to work he has to pass through three lights. The probability that any light is green is 39%. Estimate the probability that exactly two lights will be green. Use the following list of digits which was taken from a table of random numbers. In each pair of digits... 
Science
Suppose that you heated a sample of a hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the top of the test tube? Explain please i really am stumped on this question... 
Math
A bag of marbles contains only green and red marbles. All of the marbles are the same size. If the probability of selecting a green marble is 1/2. Which is most likely to be the number of green and red marbles in the bag? A.2 green 4 red B.4 green 4 red C.2 green 1 red D.1 ... 
Math
A golfer hits a ball off the ground with an initial velocity of 200 ft/s at an angle of 23 degrees. The green is 750 feet away. Will the shot make it to the green? State by how much it makes or misses the green. 
physics
A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s? 
science!
this question is not a question but 20 questions. i appreciate if you review all my answers, but i wont provide an answer for the last question (most probably since i didn't finish answering it or typing it out since i only have an hour to do that). now, let's get started. ... 
College Physics
A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.56 m/s2. How far does he go after the light turns green until he reaches a cruising speed of 10.88 m/s? 
chem
Ca(H2PO4)2 and NaHCO3 are ingredients of baking powder which react with each other to produce CO2, thereby causing dough or batter to rise: Ca(H2PO4)2 (s) + NaHCO3 (s) > CO2 (g) + H2O (g) + CaHPO4 (s) + Na2HPO4 (s) (unbalanced) If the baking powder contains 39 % NaHCO3... 
Math/dilution
A powder concentrate contains 2% w/w of active ingredient. What would be the percentage concentration (w/v) of the resultant solution after a 5g packet of powder is dissolved in enough water to make 1 quart of solution? 
Science, Astrenomey
This is my theory, read well if you wish to know the truth: according to the big bang, there is a equal amount of antimatter to the matter, BUT nearly all that matter is missing! In this theory there was NO antimatter when the earth was made. antimatter is made when ... 
Chemistry 106
What are the elements used to make the ingrediants of each category (the same element may be listed in several categories, but a maximum of once in each of the 6 categories, no matter how many different ingrediants it may be in)? **name of the element with the symbol and ... 
Chemistry
Green Light has a frequency of about 6.00 * 10^14 s^1. What is the energy of the green light? 
Biology
Plz i need help. Plants are green because the pigments in plants reflect green light. Blue and red light give them the most energy to power photosynthesis. You are conducting an experiment to see how different colors of light affect the growth of plants. You place three small ... 
math
a bag contains 6 white 2 black and 10 green marbles if a marble is selected at random find the probability that it is green 
Chemistry
Some solid calcium oxide in a test tube picks up water vapor from the surrounding to change completely into solid calcium hydroxide. An observed total initial weight (calcium oxide + test tube) f 10.860g goes eventually to 11.149g. What is the weight of the test tube? 
AP Physics B
A soap bubble of index of refraction 1.43 strongly reflects both the red and the green components of white light. What minimum film thickness allows this to happen? (In air,the wavelength of red light is 703 nm, of green light 502.143 nm.) Answer in units of nm 
Algebra help??!!
I'm really confused with sets, could someone please check my answer?? I just really don't want to get it wrong... You have two boxes of colored pens, The first box contains a red pen, a blue pen, and a green pen, The second box contains a yellow pen, a red pen, and a black pen... 
Chemistryplease help
1) Metals that are above hydrogen in the reactivity series react with dilute hydrochloric acid to produce hydrogen gas. Lead is just above hydrogen in the reactivity series.I read a book that says no reaction occurs between lead & dilute acid. Why? Is it because the reaction ... 
Aluminum powder Separation
We have large quantities of powder containing 40 % alu, 23 % of Si metal , 27 % of Zr metal and other FEO2, CAO,Mg. 0 to 200 µ 200 000 Tons available How is possible to separate it ? 
physics
Green light has a wavelength of 4.96 107 m and travels through the air at a speed of 3.00 108 m/s. Calculate the period of green light waves with this wavelength. s What is the frequency? Hz 
physics
Green light has a wavelength of 4.96 107 m and travels through the air at a speed of 3.00 108 m/s. Calculate the period of green light waves with this wavelength. s What is the frequency? Hz 
math
A traffic light follows the pattern green, yellow, red for 55, 5, and 20 seconds, respectively. What is the probability that the driver approaching this light will find it green or yellow? 
propability
Lorenzo has a jar with 21 green olives and 15 black olives in it. If he takes two olives out of the jae with replacement,what is the probability that the first olive will be black and the second olive will be green? 
Statistics
A package of selfsticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly selecting one of the notepads and recording its color. Find the probability that a green notepad is selected given that it is either blue or green. A... 
Chem
Solid ferric nitrate and aqueous sodium hydroxide are combined with water in a test tube. A brown to red precipitate forms in the test tube. Write a complete chemical reaction that accounts for the formation of the solid. 
Chemistry
For my chemistry lab, I reacted Mg powder with HCl to create H2 gas. I measured the volume of H2 gas created by salt water displacement by reading off an inverted test tube. I measured 14.0 mL and calculated the percent yield (used PV=nRT to find theoretical volume and divided... 
math
In a bag there are red, green, black,and white marbles. If there are 6 red, 8 green, 4 black, and 12 white and one marble is to be selected at random, what is the probability it will be white? I don't know how to solve these. 
physics
At the instant a traffic light turns green, a car starts from rest with a given constant acceleration 0.5 m/s^2. just as the light turns green, a bus, traveling with a given cinstant speed 16.0 m/s, passes the car. The car speeds up and passes the bus some time later. How far ... 
physics
At the instant a traffic light turns green, a car starts from rest with a given constant acceleration 0.5 m/s^2. just as the light turns green, a bus, traveling with a given cinstant speed 16.0 m/s, passes the car. The car speeds up and passes the bus some time later. How far ... 
algebra
A TRAFFIC LIGHT IS RED FOR 38 SECONDS YELLOW FOR 10 SECONDS AND GREEN FOR ONE MINUTE AND TWELVE SEONDS. IN A CONSTANTLY REPEATING CYCLE, WHAT IS THE PROBABILITY THAT AT THE MOMENT A PASSING PEDESTRIAN GLANCES AT IT, THE LIGHT WILL BE GREEN 
phys
A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that this light stays red for 15s{\rm s} , and she wants to reach the light just as it turns green again. It takes her 1.0s{\rm s} to step on the brakes ... 
Chem
Classify each of theses changes as a positive or negative change in entropy of a sample of this green gas. A) chlorine gas condense to a liquid =  B) chlorine gas is heated in a container= + C) chlorine gas deposits on a cold surface=  
Chemistry
This question refers to spectroscopy. So why are certain colors used in this experiment? For example, why would a yellow light be used instead of a green light? And if I were to use a green light instead of a yellow light, would absorbance values be higher or lower? 
Math
ceftriaxone (rocephin) is a dry powder antibiotic that must be reconstituted for use. the label states that to create a 100 mg/ml solution, 4.8 ml must be added to a 500mg vial. what is the powder volume. I am not sure what formula to use for this problem. How do I go about ... 
Math
A car is stopped at a red light, and starts moving at time t = 0 when the light turns green, with an acceleration given by a(t) = √t, with t given in seconds, and distances given in metres. a. Find a Formul 
biology
A rock covered with green spots is placed on a screen in a test tube above some bromothymol blue solution; after several hours, the solution remains blue. What can you conclude form this experiment? AFter doing research, I found out that bromothymol solution is a blue liquid ... 
Morales
A black rectangular box is 8 inches longer than it is wide. A green rectangle box is 3 inches wider than the black box but it has the same length. The area of the green box is 39 square inches more than the area of the black box. 
Morales
A black rectangular box is 8 inches longer than it is wide. A green rectangle box is 3 inches wider than the black box but it has the same length. The area of the green box is 39 square inches more than the area of the black box. 
biology
I have another experiment that I am not clear about the results. Any help? Put water, hydrogen proxide, and manganese dioxide powder in test tube, see what happens. Then put sand in the mixture. Results? Then,put liver in it. What happens? Thanks for helping. 
Chemistry
Some solid CaO in a test tube picks up water vapor from the surroundings to change completely to Ca(OH). An observed total initial weight (CaO + test tube) of 10.860 g goes eventually to 11.149 g. What is the weight of the test tube? 
MATH CHECK!
There are 20 red beans in the jar 10 fewer white than yellow half as many orange than red 10 more black than green twice as many yellow as red 5 fewer green as red please check: 10 orange 15 green 25 black 40 yellow 25 pink 30 white 
Chemistry
If I heated NaNO3, would there be yellow gas inside the test tube? 
science
Destiny is using a nutrient solution to use in her garden.She places the powder in a watering can.Then she adds the water.Which would dissolve the powder the fastest? A.SHAKING THE CAN VIGOROUSLY B.STIRRING THE SOLUTION SLOWLY C.TILTING THE CAN CAREFULLY FROM SIDE TO SIDE D.... 
Science
Destiny is using a nutrient solution to use in her garden.She places the powder in a watering can.Then she adds the water.Which would dissolve the powder the fastest? A.SHAKING THE CAN VIGOROUSLY B.STIRRING THE SOLUTION SLOWLY C.TILTING THE CAN CAREFULLY FROM SIDE TO SIDE D.... 
chemistry
1.If a container that is 1L has 1 mol of solid NACL , if you add more nacl will the concentration of solid increase? it should? because if you increase it to two mols it will become 2 mol/l right? so in a equillibrium system like nacl(s)><na+ + cl if you increase ... 
Science
When we look at a leaf, we see the colors of light that are reflected off its surface. How does this explain there relatively low flow of oxygen in green light? 
Science
When we look at a leaf, we see the colors of light that are reflected off its surface. How does this explain there relatively low flow of oxygen in green light? 
Physics
The refractive index of a medium changes with the wavelength of incident light. Typically, the shorter the wavelength the larger the refractive index. Fused quartz has a refractive index of 1.47 for indigo light of 400 nm in wavelength, and a refractive index of 1.46 for green... 
chem lab
I'm doing a lab on helium and hydrogen emission spectra. so I got violet 20.35cm blue/green 21.70cm green 22.75 light green 23.08 yellow 27.70 red 31.70 faint red 33.95 and I also have the wavelenghts for helium spectra, its given. like for ex. violet is 380420, my question ... 
Math
Jennifer is picking a ball out of a box without looking. the probability of picking green ball is 1/12. which option BEST describes the likelihood of Jennifer picking a green ball? A Picking a green ball is impossible B Picking a green ball is unlikely C Picking a green ball ... 
Math
Mrs. Jones had some white paint and some green paint, and a bunch of wooden cubes. Her class decided to paint the cubes by making each face either solid white or green. Juan painted his cube with all 6 faces white  Julie painted her cube solid green. Hector painted 4 faces ... 
chemistry
If 10.0 g of CaCO3(s) is heated, 5.61 grams of solid CaO will remain (4.39 g CO2 gas is driven off) If 3.25 g of NaCl(s), which does not undergo decomposition, is mixed with 5.30 g of CaCO3(s) and the mixture is heated long enough to decompose all of the calcium carbonate, how... 
math PLEASE HELP ME
Mrs. Jones had some white paint and some green paint, and a bunch of wooden cubes. Her class decided to paint the cubes by making each face either solid white or green. Juan painted his cube with all 6 faces white  Julie painted her cube solid green. Hector painted 4 faces ... 
physics
Consider a horizontal road with such a set of traffic lights, each spaced 100 m apart. A car sits at the first traffic light. At t=0 the light turns green and the car accelerates. What is the maximum time t in secondsthe next light must turn green by so the driver of ... 
English
Hello, Dr. Green.  In this expression, is Dr. Green a doctor who works at a hospital? Or is Dr. Green a professor in college? 
Science
I have 2 questions. 1.) Is there a powder that just contains insoluble fiber. I know that Benifiber and many other products contain soluble fiber or both soluble and insoluble fiber. But for the experament I have put together i need an insoluble fiber powder ONLY! I have not ... 
math [pls help. it is urgent]
2/5 of my sister's beads are yellow, 7/13 of the remaining beads are green. The rest of the beads are black. If there are 32 more yellow beads than black beads, how many beads are green. 
Math
A jar contains 5 yellow marbles, 16 green marbles, and 8 black marbles. If one marble is selected at random, what is the probability that it is not green? 13 chances out of 16 (5/29*4/28)+(5/29*8/28)+(8/29*5/28)+(8/29*7/28)=39/203 
Physics
Calculate the Patm And the pressure exerted by water on the block  The area Of the upper face of block is 40 cm2 Calculate the total pressure exerted on the solid Given : In the first tube : in a tube a solid .. the height from solid to the water level in the tube is 8o cm & ...