The classification of matter. Pure substancesA pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary. ElementsAn element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.Here’s an example: Gold is an element. If you slice and slice a chunk of gold until only one tiny particle is left that can’t be chopped any more without losing the properties that make gold gold, then you’ve got an atom.The atoms in an element all have the same number of protons.
Protons are subatomic particles — particles of an atom. Elements are the building blocks of matter. And they’re represented in a strange table you may have seen at one time or another — the periodic table.
CompoundsA compound is composed of two or more elements in a specific ratio. For example, water is a compound made up of two elements, hydrogen (H) and oxygen (O).
These elements are combined in a very specific way — in a ratio of two hydrogen atoms to one oxygen atom, known as. Many compounds contain hydrogen and oxygen, but only one has that special 2 to 1 ratio we call water. The compound water has physical and chemical properties different from both hydrogen and oxygen — water’s properties are a unique combination of the two elements.Chemists can’t easily separate the components of a compound: They have to resort to some type of chemical reaction. MixturesMixtures are physical combinations of pure substances that have no definite or constant composition — the composition of a mixture varies according to who prepares the mixture.Although chemists have a difficult time separating compounds into their specific elements, the different parts of a mixture can be easily separated by physical means, such as filtration.
For example, suppose you have a mixture of salt and sand, and you want to purify the sand by removing the salt. You can do this by adding water, dissolving the salt, and then filtering the mixture. You then end up with pure sand.Mixtures can be either homogeneous or heterogeneous:.A homogeneous mixture, sometimes called a solution, is relatively uniform in composition; every portion of the mixture is like every other portion.For example, if you dissolve sugar in water and mix it really well, your mixture is basically the same no matter where you sample it.A heterogeneous mixture is a mixture whose composition varies from position to position within the sample.
8,111 results, page 3.The boys mixed 10 gallons of 20% pure lemon juice mix and 10 gallons of the 70% pure lemon juice mix, because they wanted 20 gallons of lemonade at a 40%lemon juice mixture. They thought that because 40% was almost halfway between 20% and 70%,they should asked by on.A mixture of 0.2 moles of alcohol A and 0.5 moles of alcohol B has a total vapour pressure of 40 mmHg at 297 K. If the mixture obeys Raoult's law, find the vapour pressure of pure B at 297 K given that the pressure of a pure A is 20 mmHg at 297 K. Asked by on.If you have 12 moles of a substance, how many molecules do you have of that substance? Suppose the substance has a molecular weight of 342.
How many grams of that substance would you have to dissolve in a liter of water to make a 12 M solution? Asked by on.180 ml of a mixture of water and alcohol with 90% alcohol concentration is mixed with 70 ml of pure water. What is the alcohol concentration of the new mixture? Do the following: 1) Find out how many ml of alcohol was in the first mixture. (What is 90% of asked by on.A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) - Na2CO3(s) + H2O + CO2(g) asked by on.The following questions concern the iconic Nestle Toll House Chocolate Chip Cookie recipe, shown below: 2 1/4 cups all-purpose flour 1 teaspoon baking soda 1 teaspoon salt 1 cup butter or margarine, softened 3/4 cup granulated sugar 3/4 cup packed brown asked by on.what effect over the density of a soda will have the next changes: 1)fresh soda used (not flat) 2)diet soda accidentally dilluted with distilled water 3) regular soda accidentally dilluted with distilled water electronic balance always measures too high.
Asked by on.put this in an math expression you bake two baking sheets wit 12 scones each, two baking sheets with 20 cookies each, and one baking sheet with 2 scones and 10 cookies asked by on.Only pure substance are homologous,true or false? Can you please explain too?
Asked by on.which isn't a pure substance? 1.Cl2(g) 2.Fe(s) 3.O2(aq) 4.C6H12O6(b) 5.H2O(l) asked by on.The Royal Fruit Company produces two types of fruit drinks. The first type is 60% pure fruit juice, and the second type is 100% pure fruit juice. The company is attempting to produce a fruit drink that contains 70% pure fruit juice.
How many pints of each asked by on.a can of soda at 80 F is placed in a refrigerator that maintains a constant temperature of 37 F the temperature T of the soda t minutes after it is placed in the refrigerator is given by T(t)=37+43e^-0.058t find temp to the nearest degree of the soda after asked by on.Hi. I am conducting a science experiment to present to a class. Details of experiment below.
Materials: 1 can of non-diet soda 1 can of diet soda 2 buckets of water 1. Fill bucket 2. Put can of non-diet soda into a bucket of water. Wait for the can to asked by on.The following questions concern the iconic Nestle Toll House Chocolate Chip Cookie recipe, shown below: 2 1/4 cups all-purpose flour 1 teaspoon baking soda 1 teaspoon salt 1 cup butter or margarine, softened 3/4 cup granulated sugar 3/4 cup packed brown asked by on.Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until asked by on.2.
Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring asked by on.Ph scale Which on is true A substance with ph is twice as acidic as substance with ph of 4. A subtances with ph 3 is 10 as acidic as substance with ph of 4. A substance with ph 3 twice as alkies as substances with ph 4.
A substancs with ph 3 10 time alkies asked by on.Substance A and substance B react to form substance C as described by the equation: A + B ↔ C If only substance A and substance B are placed in an enclosed vessel and allowed to react what would the reaction be? Asked by on.As a growing number of producers pursue multichannel distribution, they could probably learn some lessons from the masters at the game—the big soda companies.
Think of all the places in your community where you can purchase a Coke or a Pepsi. How is the asked by on.The Royal Fruit Company produces two types of fruit drinks.
The first type is 65% pure fruit juice, and the second type is 90% pure fruit juice. The company is attempting to produce a fruit drink that contains 75% pure fruit juice. How many pints of each asked by on.1.What two things happen to particles in a substance when the substance is heated? What are the three most common states of matter on Earth? Why does a liquid take the shape of whatever container it is in but does not expand to fill the container asked by on.Which of the following is NOT a pure substance? Carbon dioxide asked by on.Which of the following is not a pure substance? Carbon dioxide asked by on.Hi!
I'm having trouble solving this question, not sure how to go about starting it: Magnalium is a solid mixture of aluminum metal & magnesium metal. An irregular shaped chunk of a sample of magnalium is weighed twice, once in air (211.5g) and once in asked by on.125/500 women soda drinkers indicate they drink diet soda. At the.01 level, does this evidence indicate that more than 20% of the women soda drinkers drink diet soda? Determine and explain the P-value please.
I have the numbers.just cannot explain. Asked by on.Critical Thinking Question When baking biscuits a coworker adds yeast to the formuala in addition to baking powder.
What should you do. Explain asked by on.How many cups or tablespoons are in 30 mL?
I am baking and I need the amount. What baking tool should i use for 30 mL? Asked by on.In exercises 31-34, a cooler at a picnic contains 100 cans of soda covered by ice.
There are 30 cans of soda, 40 cans of orange soda, 10 cans of ginger ale,and 20 cans of root beer. The cans are all the same size and shape. If one can is selected at random asked by on.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 asked by on.what does a soda CAN do? What materials are used in making a soda CAN and why? How does a soda CAN do what it does? Asked by on.what does a soda can do? What materials are used in making a soda can and why?
How does a soda can do what it does? Asked by on.The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to asked by on.A 75% alcohol concentration mixture of water and alcohol was made by mixing 30ml of pure alcohol with 150 ml of original mixture of water and alcohol. What was the alcohol concentration of the orignal mixture The amount of water has not changed.
Since the asked by on.this is in a crossword puzzle, what is the simplest type of a pure substance? There are 7 spaces and the second letter is a L.
Asked by on.Suppose you are given a sample of a homogeneous liquid. What would you do to determine whether it is a solution or a pure substance?
Asked by on.Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about.50 mol/dm^3. I'm pretty sure the formula to use is pj=xjpj'. Asked by on.When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved.
This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of a white precipitate. The chemical was.
The household ammonia NH3 b. Asked by on.Two solutions are prepared. In Solution A, 5.0 g of a substance of molecular weight 50 is dissolved in 100 mL of pure water. In Solution B, 5.0 g of a substance with molecular weight of 75 is dissolved in 100 mL of pure water. The solute is non volatile asked by on.which of the following is an example of a chemical change? A)Iron changes when heated B)Gas bubbles form in boiling water C) Balls of wax form when melted wax is poured into ice water.
D)A gas forms when vinegar and baking soda are mixed My Choice D asked by on.If mixing baking soda, (NaHCO3) with vinegar (CH3COOH) to generate carbonic acid (H2CO3), which breaks up into water and carbon dioxide gas) and sodium acetate (NaCH3COO), would the equation be: NaHCO3 + CH3COOH yields H2CO3 + NaCH3COO asked by on.The solvent for an organic reaction is prepared by mixing 50.0 of acetone with 57.0 of ethyl acetate. This mixture is stored at 25.0. The vapor pressure and the densities for the two pure components at 25.0 are given in the following table. What is asked by on.Scott wants to make 6 gal of a 50% sugar solution by mixing together a 60% sugar solution and pure water. How much of each solution must he use?
Mixture 1 @ 60% = x gallons pure water = 100% - x (??? That's my question.is that correct? Or is it 0?) asked by on.i really need help on this question!! I need to solve it using a system of two equations, the question says that an automobile radiator contains 16L of antifreeze and water. This mixture is 30%antifreeze. How much of this mixture should be drained and asked by on.Ethan is observing chemical and physical properties of a substance.
He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. Asked by on.the estimate the number of cans of soda thet drink each week? Number of student just pretend this is a bar graph. Number of student.number of can of soda 2 students of zero and 3 can of soda for 3 students,2 soda of 4 students, 3 can soda asked by on.I must come up with an maths model to solve this.
Sally is baking some biscuits for a party. It takes 5/6 of a cup of mixture to make one batch. How many batches can she make out of cups of mixtures? Asked by on.You have decided to eat sushi for lunch and have a grand total of $20 to spend. Whatever money you have left over from buying sushi rolls will be spent on cans of soda to get you through the rest of the day.
Your problem is to choose the best combination asked by on.which of the following compounds dissolve in water?? -Sodium Nitrate (NaNO3) - Sucrose (C12H22O11) - Sodium Chloride (NaCl) - Potassium Sulfate (K2SO4) - Ethanol (C2H5OH) - Sodium Bicarbonate (Baking Soda)(NaHCO3) - Calcium Sulfate (CaSO4) i did an asked by on.pure acetylsalicylic acid has a melting point of 135.0 - 135.5 degreed celsius. What would you expect to happen to the melting point if this was mized as a 50:50 mixture with pure benzoic acid (mp 121 - 122) asked by on.You need 715 mL of a 45% alcohol solution.
On hand, you have a 55% alcohol mixture. How much of the 55% alcohol mixture and pure water will you need to obtain the desired solution?
Asked by on.Which of the following is pure substance? Chocolates milk Orange juice Seawater Hydrogen peroxide I'm not sure what's the right answer!! Asked by on.What is pure liquid? What is impure liquid? Thx You are going to have to define these in context.
'Pure' is a relative term. For instance, the term 'pure' water.is it really pure?
It depends on the definition of pure being used. Pure liquid could mean asked by on.I have to design a gadget that will either: light a match, pop a balloon, cause something to change color, lift a 500gm object at least 5cm, Blow out a candle, and/or turn on a light bulb. This experiment can be done by either using baking soda and vinegar asked by on.I titrated 0.25g of soda ash mixed with 25mL of deionized water and it took 43.7mL of hydrochloric acid to complete the titration.
I am trying to figure out how to find the moles of sodium carbonate in the soda ash and then the percent of sodium carbonate asked by on.Okay, basically what we did in the lab was fill up an empty soda can with about 5mL of water, and we had to heat it up to a boiling point. After that we turned the soda can upside down into a beaker with cold water.
After a minute or so, the can just asked by on.Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A property of matter describes its asked by on.I have 2 questions in math that I am not quite sure about. Mandy begins bicycling west at 30 mph at 11 A.M. If Liz leaves from the same point 20 min. Later bicycling west at 36 miles per hour, when will she catch Mandy? A mixture of 10% acid and asked by on.I have 2 questions in math that I am not quite sure about. Mandy begins bicycling west at 30 mph at 11 A.M. If Liz leaves from the same point 20 min.
Later bicycling west at 36 miles per hour, when will she catch Mandy? A mixture of 10% acid and asked by on.Assume that a reaction occurs in which unknown substances R and S react to form unknown substances T and U. From the information below, determine the mass of substance T that will be formed if 45.0 grams of substance R reacts with 23.0 grams of substance asked by on.An unknown substance has a mass of 28.1 g. The temperature of the substance increases by 16.3 degrees Celsius when 176 J of heat is added to the substance. What is the most likely identity of the substance?
The table lists the specific heat capacities of asked by on.a bottle of a soft drink looks pure, but it is not, how could you demonstrate that it is a mixture? Thanks asked by on.Which of the following is a pure substance? Chocolate milk B. Orange Juice C.
Hydrogen peroxide (h202) is the answer C. Asked by on.2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater.
Hydrogen peroxide (H2O2) asked by on.For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that? Asked by on.For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that? Asked by on.A) How do you make 200 mL of a 0.1 M solution of a substance that has a molecular weight of 121.1 g/mol? Answer I got: 200mL = 1/0.1M x 1/(121.1g/mol) x mass of the substance.
Mass of the substance = 0.2L x 0.1M x 121.1g/mol=2.42g Note that my answer asked by on.Four people each buy 2 bottles of soda. They each want to share with three friends. How much soda does each friend receive? Asked by on.Dave is buying pizza and soda. Suppose that a slice of pizza and a can of soda each cost $4 Let E be the amount in dollars that Dave spends on pizza and soda.
If Dave buys P slices and S cans of soda, which one of the following equations correctly asked by on.Marissa bought 6 fewer pints of soda then orange juice.how many cups of soda did she buy asked by on.Marissa bought 6 fewer pints of soda than orange juice. How many cups of soda did she buy? Asked by on.If one-fourth cup of vinegar contains 0.049 mole of HC2H3O2, how many grams of baking soda will react with this amount of acetic acid? What would be the percent by weight of HC2H3O2 in this one-fourth cup of vinegar solution? (assume density of vinegar is asked by on.How could you test your gold jewelry to determine whether it is a pure compound or a mixture? Asked by on.Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of asked by on.1.
What elements are soda cans made of? What materials were used in (making) the soda can? Asked by on.1. What 2 elements are soda cans made of?
What materials were used in (making) the soda can? Asked by on.A radioactive substance decays according to the formula A=A0e^kt where A0 is the initial amount of substance (in grams) A is the amount of substance(in grams) after t years k is a constant The half-life of the substance is 10 years.If we begin with 20g of asked by on.1. Which of the following should be classified as a suspension?
Sand in water C. Which of the following is an of example of a chemical property? Flammability C. Hardness. D. Melting point 3. Which state of asked by on.I need help classifying these as physical or chemical changes!
Sodium metal exposed to air turns dark gray. Steam in a test tube condenses to moisture. Baking soda in vinegar releases bubbles. Water dissolves in vinegar to give a solution. Asked by on.A brand cookie mix calls for baking cookies at a temperature of 350°F. However, for high altitues (3500-6500 ft. Above sea level) l, baking at 37t°F is suggested.
Construct a piecewise linear function for the recommended baking temperature, T (s), as asked by on.Soda comes in packs of 6. Candy comes in 4 bags per pack.
What is the least number of each pack (Soda and Candy) she must buy to have exactly one soda per bag of candy? Asked by on.74.
Sodium hydrogen carbonate is also known as baking soda. When this compound is heated, it decomposes to sodium carbonate, carbon dioxide, and water vapor. Write the balanced equation for this reaction. What volume of carbon dioxide gas at 77 degrees C asked by on.Mixture Problem. An auto tech needs a radiator to have a 40% antifreeze solution.
The radiator currently is filled with 4 gallons of a 25% antifreeze solution. How much of the antifreeze mixture should be drained from the car if the mechanic replaces it asked by on.I have tried this 3 ways and this is my last chance to get ir rigth please help. Dave is buying pizza and soda. Suppose that a slice of pizza and a can of soda each cost $4 Let E be the amount in dollars that Dave spends on pizza and soda. If Dave buys P asked by on.describe how you would produce pure samples of iron and sulphur powders from a mixture of the two.
Asked by on.A full can of soda has a mass of 0.421 kg. It contains 3.57 x 10-4 m3 of liquid.
Assuming that the soda has the same density as water, find the volume of aluminum used to make the can. Asked by on.1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension? Asked by on.A 0.250-kg block of a pure material is heated from 20.0°C to 65.0°C by the addition of 4.35 kJ of energy.
Calculate its specific heat and identify the substance of which it is most likely composed. Asked by on.1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension? Asked by on.1)Compare the properties of metals nonmetals and metolliods? 2)Why can elements and compound be considered pure substance? 3)What is the difference between colloids and suspension?
Asked by on.Nitrogen dioxide (NO2) cannot be obtained in a pure form in the gas phase because it exists as a mixture of NO2 and N2O4. At 23°C and 0.94 atm, the density of this gas mixture is 2.6 g/L. What is the partial pressure of each gas? NO2 N2O4 asked by on.A mixture of 0.2mole of alcohol A and 0.5mole of alcohol has a total vapour pressure of 40mmHg at 298k,if the mixture obey's Raoult's law,find the pure pressure of B at 298k given that the pressure of A is 20mmHg at 298k asked by on.A mixture of 0.2mole of alcohol A and 0.5mole of alcohol has a total vapour pressure of 40mmHg at 298k,if the mixture obey's Raoult's law,find the pure pressure of B at 298k given that the pressure of A is 20mmHg at 298k asked by on.at a baseball concession stand 3 hot dogs and 2 cups of soda together cost 13.50. Two hot dogs and 1 cup.of soda together costs 8 select all statements that are true about this situation.
Each hot dog costs 2.50 B. Each cup of soda costs 3.50 C. The asked by on.Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter asked by on.Suppose soda is on sale for.50 a can and you have a coupon for.80 off the total price. Write a function rule for the cost of n cans of soda. My answer is c(n =.80n.50 asked by on.Mean=15.854, Median=15.99, Mode=16.21, SD=0.661381 1) what is the probability that a randomly chosen bottle will contain 16 ounces of soda? 0.22075, 0.587357 2)What is the value of soda associated with a Zscore of -1.5 asked by on.A baker uses sodium hydrogen carbonate as the leavening agent in a banana nut quickbread.
The baking soda decomposes according to two possible reactions. 2 NaHCO3 = Na2CO3+H2O+CO2 2. Calculate the volume in mL of CO2 that forms at asked by on.Two or more combined substances that do not react form a. Solution mixture substance compound asked by on.are these items belowed classified as a heterogeneous mixture, a solution, a compound or and element?
Chalk clear spring water oxygen tomato soup pencil ice and soda sterling silver iron asked by on.how do i get pure samples from a mixture of potassium carbonate,ammonuim chloride and copper (ii)oxide asked by on.