→ indicates the direction of the chemical reaction, that is, the sodium and the water reacted together in order to produce some new substances (products of the reaction). If more than one product is present then the names of each product are separated by a plus sign (+). Marisa Alviar-Agnew (Sacramento City College). When I eat starch, a chemical reaction takes place in my mouth which breaks that starch down into sugars. Consider the description below for preparing barium sulfate, a white solid that is used in medicine (known as a "barium meal"): Barium sulfate can be prepared by adding sulfuric acid to a solution of barium nitrate. Identify the "given"information and what the problem is asking you to "find.". Does the conversion factor $$\frac{1 \; \rm m}{100 \; \rm{cm}}$$ also equal 1? }=\frac{0.030 L}{1 fl oz. These bubbles force their way up through your drink until they reach the surface where they can finally escape and join the atmosphere. }, http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110, Adelaide Clark, Oregon Institute of Technology. A word equation is a short-hand way of describing a chemical reaction. Hydrogen was NOT present at the start, it was produced as a result of the chemical reaction. This is valuable because certain measurements are more accurate or easier to find than others. A conversion factor is a factor used to convert one unit of measurement into another. After paying for 3 cards and some stamps, he had \$3 left. Soccer is played with a round ball having a circumference between 27 and 28 inches and a mass between 14 and 16 oz. Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors. Here is what we would have gotten: $3.55 \; \rm{m} \times \dfrac{1\; \rm{m}}{100 \; \rm{cm}} = 0.0355 \dfrac{\rm{m}^2}{\rm{cm}}$. We know that 100 cm is 1 m, so we have the same quantity on the top and the bottom of our fraction, although it is expressed in different units. Is a 197-lb weight lifter light enough to compete in a class limited to those weighing 90 kg or less? Chemical reactions are occuring all around you every day and every night. If I add hydrochloric acid to iron, I produce iron chloride and hydrogen. But hydrogencarbonate (one word), or hydrogen carbonate (two words but no and between them), is the name of a compound. Before you break out your calculator, read the problem all the way through. If more than one reactant is present then the names of each reactant are separated by a plus sign (+). For instance, you already know that 12 eggs equal 1 dozen. that is, we start with "reactant" and we end up with "product". Subscribe to RSS headline updates from: Powered by FeedBurner. For example, water is a compound, ammonia is a compound, ethanol is a compound. I want to write a word equation to describe the chemical reaction in which carbonic acid decomposes to produce carbon dioxide and water: So my word equation for the decomposition of carbonic acid in my cola drink is: There may be more than one reactant present in a chemical reaction. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. A hummingbird can flap its wings once in 18 ms. How many seconds are in 18 ms? Have questions or comments? Is it large enough to contain the acid, the density of which is 1.83 g/mL? Perhaps you can determine the answer in your head. Write the conversion factors (as ratios) for the number of: The label on a soft drink bottle gives the volume in two units: 2.0 L and 67.6 fl oz. *pounds and ounces are technically units of force, not mass, but this fact is often ignored by the non-scientific community. The two reactants are: Let's see if we can identify a new substance that has been produced, that is, let's find the name of a product of this chemical reaction: Hydrogen is a product, it is the new substance formed when we mix the reactants (zinc and hydrochloric acid) together. If we see a word equation written down, we can follow the directions it gives in order to make the make new substance(s). Make the conversion indicated in each of the following: (a) the men's world record long jump, 29 ft 4.5 in, to meters, (b) the greatest depth of the ocean, about 6.5 mi, to kilometers, (c) the area of an 8.5 by 11 inch sheet of paper in cm2, (d) The displacement volume of an automobile engine, 161 in3, to L, (e) the estimated mass of the atmosphere, 5.6 x 1015 tons, to kilograms (1 ton = 2000 lbs), (f) the mass of a bushel of rye, 32.0 lb, to kilograms, (g) the mass of a 5.00 grain aspirin tablet to milligrams (1 grain = 0.00229 oz), Many chemistry conferences have held a 50-Trillion Angstrom (Å) Run. But the names of some metals do not end in "ium", for example, iron, silver, gold, copper, zinc, lead, mercury, nickel. We can write 1 as $$\mathrm{\frac{100\:cm}{1\:m}}$$ and multiply: $3.55 \; \rm{m} \times \dfrac{100 \; \rm{cm}}{1\; \rm{m}}$. General word equation: reactant(s) → product(s). Therefore the word equation we wrote states that Chris added some sodium to water and produced hydrogen and sodium hydroxide. Since this agrees with what we were told in the problem, we are confident that our word equation is plausible. (a) What is the volume of 25 g of iodine (density = 4.93 g/cm3)? The average volume of blood in an adult male is 4.7 L. What is this volume in milliliters? What are these specifications in cm and g? hydrogen + sodium hydroxide means that the products of this chemical reaction are the two new substances hydrogen and sodium hydroxide. Of course, there are other ratios which are not listed in Table $$\PageIndex{1}$$. Dimensional analysis is amongst the most valuable tools that physical scientists use. Phosphorus and sulfur are also elements that are non-metals. Write a word equation to describe the chemical reaction that Chris demonstrated to the students. Make sure you understand what the question is asking. You can find the names of elements in the periodic table of the elements. Here is a simple example. Pharmacists must know a lot of chemistry and biology so they can understand the effects that drugs (which are chemicals, after all) have on the body. The distance between the centers of two oxygen atoms in an oxygen molecule is 1.21 x 10-8 cm. Chances are that someone has already asked for a solution to your chemistry problem, or at least to a similar one, and you will be able to view the answer online. Some content on this page could not be displayed. During your studies of chemistry (and physics also), you will note that mathematical equations are used in many different applications. The information tells us how to prepare barium sulfate, that is, this chemical reaction will make (or produce) barium sulfate, therefore the product of the chemical reaction is barium sulfate. The label on a box of cereal gives the mass of cereal in two units: 978 grams and 34.5 oz. (c) What is the volume of 11.3 g graphite (density = 2.25 g/cm3)? From chemistry word problem-solver to subtracting rational, we have got every part discussed. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. This page was constructed from content via the following contributor(s) and edited (topically or extensively) by the LibreTexts development team to meet platform style, presentation, and quality: CK-12 Foundation by Sharon Bewick, Richard Parsons, Therese Forsythe, Shonna Robinson, and Jean Dupon. The product of a reaction is the substance that is formed, or produced, as a result of the chemical reaction taking place. Reactants and products can be elements or compounds. The diameter of a red blood cell is about 3 x 10-4 inches. As long as we perform the same operation on both sides of the equals sign, the expression remains an equality. 2020-10-15T12:00:00+01:00. Conversions in the metric system, as covered earlier in this chapter. The hydrogen gas would be released as a burp! Writing Word Equations for Chemical Reactions . Simply put, it is the conversion between an amount in one unit to the corresponding amount in a desired unit using various conversion factors. In general the name of a compound will be made up of two words. The general form of a word equation is shown below: draw an arrow to show the direction of the chemical reaction, →, write the name of the product (sugars) to the right of the arrow, write the name of the reactant (carbonic acid), write the names of each of the products separated by a plus sign (+) to the right of the arrow (carbon dioxide + water), write the names of each of the reactants separated by a plus sign (+) (hydrochloric acid + calcium carbonate), write the names of each of the products separated by a plus sign (+) to the right of the arrow (calcium chloride + carbon dioxide + water).

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