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Portage) CHM095 - Basic Lab Chemistry - Final Assessment Guide 2024-2025

HEAL100 Health Care — exam and revision material · Other

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Health Care exam material, 7 pages. Originally published on StudyMerit.

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7
Academic year
2025/2026
Language
English

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Chem 095 - Final Exam Review (All Chapters) Students also studied Science Chemistry Analytical Chemistry Make a copy Save Chem 095 Module 1 test prep 107 terms grace_fye5 Preview Chem 095 Module 3 Polyatomic Ion ... 17 terms joestine7 Preview Chem 095 Module 2 68 terms mxrciev Preview CHEM 17 terms tay P What are the two types of scientific observations? qualitative and quantitative what type of observation is a quantitative one? a measurement What is scientific notation used for? to express very large or very small numbers What is the metric and SI units for length? Meters (m) What is the metric and SI units for mass? Metric- gram (g) SI- kilogram (kg) What is the metric and SI units for volume? Metric- liters (L) SI- cubic meters (m^3) What is the conversion factor between cubic centimeters and milliliters useful for density problems? 1 cm^3 = 1 mL What is the formula for density? Density = mass/volume What is the unit for density? g/mL how are exact numbers obtained? by counting or by using a definition that compares two units ex: # of tires on a car, # of eggs in fridge, 100cm=1m, 12 items=1 dozen What type of numbers are not always exact and have some degree of uncertainty? measured numbers

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What are the rules of significant figures? 1. All nonzero numbers are always significant. 2. Zeros: Leading - never Captive - always Trailing - sometimes 3. Exact numbers determined by counting or a definition, equality, or conversion factor What are the rules of significant figures in multiplication and division? The number of significant figures in the result is the same as that in the measurement with the smallest number of significant figures. What are the rules of significant figures in addition and subtraction? The limiting term is the one with the smallest number of decimal places. What are the metric prefixes you must know? mega (M) - 10^6 kilo (k) - 10^3 deci (d) - 10^-1 centi (c) - 10^-2 milli (m) - 10^-3 micro (u) - 10^-6 nano (n) - 10^-9 What is a unit conversion factor? a ratio of two equivalent quantities expressed in different measurement units Change 18.0 mL to liters with the appropriate number of SFs 0.0180 3 SFs are required Express a volume of 1.250 L in mL with the appropriate number of SFs 1250 mL Express 2.63 pounds in milligrams with the appropriate number of SFs 1 lb = 453.6 g 1 190 000 mg What is matter? Anything that has mass and takes up space What is a pure substance? either elements or compounds that always have the same composition ex: pure H2O, Fe, Al What are elements? fundamental substances that cannot be broken down into other substances by chemical means. Found on the periodic table. ex: iron, aluminum, oxygen, hydrogen What are compounds? a substance composed of a given combination of elements that can be broken down into those elements by chemical methods ex: water (H2O), carbon dioxide (CO2), table sugar (C12H22O11)

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What is a mixture? Two or more elements or compounds not chemically combined together ex: wood, wine, coffee, water pumped from the earth What is a homogeneous mixture? a mixture in which its constituents are visibly indistinguishable, also known as a solution. ex: salt/water What is a heterogeneous mixture? a mixture in which its constituents are not uniform throughout ex: sand/water What kind of substance is copper? an element What kind of substance is water? a compound What kind of mixture is brass? homogeneous What kind of mixture is a cup of water with pennies in it? heterogeneous What are diatomic elements? Two atoms of the same element chemically joined together. ex: O2, N2, H2 Describe a solid a state of matter with a definite shape and fixed volume with slow molecular motion held by very strong forces Describe a liquid a state of matter that takes the shape of its container and has a definite volume. The molecular motion is moderate where its particles are held by strong forces Describe a gas A state of matter with no definite shape or volume that has fast molecular motion. Its particles are weakly held together with essentially no interaction. What are physical properties? Observable properties that include color, odor, state, density, melting point, and boiling point. What are chemical properties? a substances ability to form new substances including toxicity, reactivity, and combustibility. What is a physical change? a change in the form of a substance, not in its chemical composition. Through physical changes, the molecule stays intact, only the motion and distances between individual molecules change. ex: melting, boiling, condensing, freezing, sublimation, deposition What are types of physical changes? Change of state, change of appearance, change of shape, change of size

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