Chem Unit 1 Test
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Chem Unit 1 Test - Details
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155 questions
| 🇬🇧 | 🇬🇧 |
| A digit that is either reliably known or estimated | Significant digit |
| Cannot be described in terms of anything else. ex: mass=kg, length=m, time=s | Fundamental measurement unit |
| Fundamental measurements combined to make a derived unit. ex: speed=m/s, density=g/cm^3 | Derived measurement unit |
| The rearrangement of atoms into different combinations | Chemical reactions |
| Electrons have a _______ charge | Negative |
| + in the nucleus | Protons |
| 0 in the nucleus | Neutrons |
| - outside the nucleus | Electrons |
| Protons + neutrons | Mass number |
| Substance composed of two or more elements that are chemically combined (water, table salt, sugar) | Compound |
| Made up of atoms | Elements |
| A substance where the atoms are held together by covalent bonds, ex: H2O | Molecular compounds |
| Compounds consisting of ions (atoms who have gained either a positive or negative charge) | Ionic compounds |
| Matter is neither created nor destroyed in chemical reactions | Law of the conservation of mass |
| Solids, liquids, gas | Physical states |
| Have definite composition and definite unchanging properties | Pure substances |
| Pure substances tendency to undergo chemical change. ex: burning, color changes, tarnishing | Chemical properties |
| A substance exists in a particular physical state under defined conditions. increase in temp will alter physical state (ex: color, odor, taste) | Physical properties |
| Property that does not depend on the amount of material (ex: density) | Intensive properties |
| Change in physical property (ex: melting, freezing) | Physical change |
| Non-uniform mixture containing two or more substances (ex: salt and pepper, oil and water) | Heterogeneous mixture |
| Uniform mixture, same throughout (ex: salt water, milk) | Homogeneous mixture |
| Substance doing dissolving | Solvent |
| The capacity to do work | Energy |
| Energy cannot be created nor destroyed, but only transformed from one form to another | Law of the conservation of energy |
| Produce energy | Exothermic reactions |
| Require energy | Endothermic reactions |
| Energy availalbe due to position or composition | Potential energy |
| Energy resulting from motion | Kinetic energy |
| H | Hydrogen |
| He | Helium |
| Li | Lithium |
| Be | Beryllium |
| B | Boron |
| C | Carbon |
| N | Nitrogen |
| O | Oxygen |
| F | Flourine |
| Ne | Neon |
| Na | Sodium |
| Mg | Magnesium |
| Al | Aluminum |
| Si | Silicon |
| P | Phosphorus |
| S | Sulfur |
| Cl | Chlorine |
| Ar | Argon |
| P | Phosphorus |
| Ca | Calcium |
| Sc | Scandium |
| Ti | Titanium |
| V | Vanadium |
| Cr | Chromium |
| Mn | Manganese |
| Fe | Iron |
| Co | Cobalt |
| Ni | Nickel |
| Cu | Copper |
| Zn | Zinc |
| Ga | Gallium |
| Ge | Germanium |
| As | Arsenic |
| Se | Selenium |
| Br | Bromine |
| Kr | Krypton |
| Rb | Rubidium |