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physical science 19
physical science chapter 19 flashcards
| Term | Definition |
|---|---|
| In saline, what is water solvent or solute? | Solvent |
| Water is described as a polar molecule because it has: | A partial positive and partial negative end |
| The bond between a water molecule's oxygen atom and the hydrogen atoms of another water molecule is known as: | Hydrogen bond |
| A non-polar molecule is: | unlikely to dissolve in water AND uncharged |
| Fourteen-karat gold is: | An alloy, a solution, and a mixture of two solids |
| The unit most useful for measuring the particle size of a colloid is the: | Nanometer |
| One of the simplest ways to increase the dissolving rate of a spoonful of sugar in a cup of water is to: | Stir in the water |
| If you decrease the temperature what happens to the dissolving rate of NaCl in water? | The dissolving rate decreases because solids dissolve best in higher temperatures |
| Suppose you crushed an antacid tablet before dissolving it in a glass of water. The crushed antacid tablet would: | Dissolve more quickly than a whole antacid tablet |
| If large amounts of hot water are released from a power plant or factory into a lake: | The amount of dissolved oxygen in that part of the lake will decrease |
| Timed-released medicine improves the delivery of medicine to the body by using different: | Dissolving rates |
| Children's vitamins are usually chew able. Why is it a good idea to make vitamins chew able? | Chewing increases surface area, which increases the dissolving rate of the tablet |
| A neutral solution has a pH of: | 7 |
| Most plants prefer slightly acidic soil within the pH range of: | 6.5 to 7.0 |
| The chemical formula for a hydronium ion is: | H3o |
| Heartburn, often caused by overeating, is a condition caused by excess: | Stomach acid in the esophagus |
| As the amount of carbon dioxide (CO2) builds up in your bloodstream: | Your blood pH decreases and your breathing rate decreases |
| Hydrogen ions: | Are represented as H+ |
| Solution A has a pH of 6. Solution B has a pH of 8. What is true about these solutions? | Mixing equal amounts of these solutions would produce a neutral solution |
| What are the elements necessary to be present for hydrogen bonding to occur? | N, O, F |
| An example of a nonpolar material is: | Methane |
| The shape of water is: | Tetrahedral or bent |
| The formula for concentration is: | Solute/solution |
| When you shine light through a liquid and the light scatters this is called: | Tyndell effect |
| pH stands for: | Power of Hydrogen |
| What are the 3 elements found in hydrogen bonding? | Oxygen, nitrogen and Florine |
| What happens to the pH of your blood when hold your breath? | the pH goes down and becomes more acidic |
| What happens to the pH of your blood when you hyperventilate | the pH goes up and becomes more alkaline |
| What protects your body from the acid in your stomach? | the mucous in your stomach |
| What does acid do to blue litmus paper? | Acid turns blue litmus paper red |
| What does an alkaline do to red litmus paper? | A base turns red litmus paper blue |
| Feels slippery, Acid or Base? | base |
| tastes sour, Acid or Base? | acid |
| low pH, Acid or Base? | acid |
| bitter taste, Acid or Base? | base |
| baking soda, Acid or Base? | base |
| vinegar, Acid or Base? | acid |
| ammonia, Acid or Base? | base |
| bleach, Acid or Base? | base |
| produces OH, Acid or Base? | base |
| produces H3O, Acid or Base? | acid |
| Reacts with metals to produce hydrogen gas, Acid or Base? | acid |
| can be corrosive, Acid or Base? | both |
| What temperatures do gases dissolve best in? | low temperature |
| what temperatures do solids dissolve best in? | high temperatures |
| insoluable means | does not dissolve |
| positive for tyndall effect | colloids and suspensions |
| negative for tyndall effect | solution |
| alloy for karat gold | gold and copper |
| amalgam made of | mercury (Hg) and silver (Ag) |
| Brass made of | Zinc (Zn) and copper (Cu) |
| Steel made of | iron (Fe) and carbon (C) |
| purpose for using an alloy | combining 2 elements has better properties than each of the individual elements by themselves |
| Like dissolves Like | polar dissolves polar and non-polar dissolves non-polar |
| positive end of the water molecule | the oxygen end of the water molecule |
| reason for negative end of the water molecule | unshared pair of electrons |
| methane, Polar or Nonpolar? | nonpolar |
| water, Polar or Nonpolar? | polar |
| ammonia, Polar or Nonpolar? | polar |
| pH of H3O concentration of 10-4 | pH 4 |
| in the presence of an acid what is water, acid or base? | water acts as a base |
| in the presence of an alkaline, what is water, acid or base? | water acts as an acid |
| reason fish stay in cooler water during hot weather | more oxygen dissolved in cooler water than warm water |
Created by:
Hross
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