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8th Grade Science Law of Conservation of Matter Review
Terms in this set (15)
Law of Conservation of Matter
States that, during a chemical reaction, matter cannot be created or destroyed. Even though the matter may change from one form to another, the same number of atoms exists before and after the changes take place.
reactant
The substances there before the chemical reaction occurs.
product
The substances there after the chemical reaction takes place.
molecule
Smallest unit of a compound; two atoms joined chemically.
subscript
Small number written to the right and slightly below a chemical symbol; indicates the number of atoms of that particular element in that compound.
coefficient
Number written before a chemical formula; shows how many molecules of a compound are present.
What cannot happen in the Law of Conservation of Matter?
Matter cannot be destroyed or created
What can happen in the Law of Conservation of Matter?
Matter can change state or form
equals
The mass of the products always ___________ the mass of the reactants.
chemical equation
Uses chemical symbols and chemical formulas to describe a chemical reaction.
What is the relationship between the reactants' and the product's masses?
The mass of the reactants equals the mass of the product;
the mass of the product also equals the reactants' masses
305 grams
If a student mixed 100 grams of sugar, 200 grams of water, and 5 grams of flavoring, how much will the solution weigh?
closed system
The environment where matter cannot enter or escape
matter
Anything that has mass
balance
Scientific tool essential for testing the Law of Conservation of Matter
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Verified questions
engineering
The function $y ( t ) = 1 - e ^ { - b t } ,$ where $t$ is time and $b > 0 ,$ describes many processes, such as the height of liquid in a tank as it is being filled and the temperature of an object being heated. Investigate the effect of the parameter $b$ on $y ( t ) .$ To do this, plot $y$ versus $t$ for several values of $b$ on the same plot. How long will it take for $y ( t )$ to reach 98 percent of its steady-state value?
Verified answer
engineering
The main waterline into a tall building has a pressure of 90 psia at 16 ft elevation below ground level. How much extra pressure does a pump need to add to ensure a waterline pressure of 30 psia at the top floor 450 ft above ground?
Verified answer
engineering
Drag measurements were taken for a sphere with a diameter of 5 cm, moving at 4 m/s in water at $20^{\circ} \mathrm{C}$. The resulting drag on the sphere was 10 N. For a balloon with 1-m diameter rising in air with standard temperature and pressure, determine (a) the velocity if Reynolds number similarity is enforced and (b) the drag force if the drag coefficient is the dependent pi term.
Verified answer
engineering
Show that for a signal of eight sample values, $$ w=e^{-i/4}=(1-i)/√2. $$ Check by squatting.
Verified answer
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