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14 Cards in this Set
- Front
- Back
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When hydrogen gas reacts with enough oxygen gas, water is formed. From this reaction, state which substance(s) are the reactant(s) and the product(s). |
Reactants – hydrogen gas, oxygen gasProduct - water |
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Accuracy |
The closeness of a measurement to a best/accepted value |
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precision |
The ability to repeatedly get the same/similar results |
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Use a real-life example (explanation) to show that you understand accuracy and precision. |
Being able to hit the bulls eye on a target is accuracy.Being able to get the shot in the same spot 5 to 10 times is precision. |
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What is the definition and formula used for density |
Density is the mass per unit volume of a substance.d = m/v |
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What are the units used for density? |
g/mL |
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significant figures |
are all of the digits in a measurement about which you are certain plus one uncertain digit (guesstimate). |
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What does it mean when the slope of the line that separates the solid and liquid phases in a phase diagram has a negative slope (in terms of the density of the solid vs. liquid phases)? What does it mean when this slope is positive? |
Negative slope means that the solid phase is LESS dense than the liquid.Positive slope means that the solid phase is MORE dense than the liquid. |
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Why is the metric system the commonly accepted unit of measure by the international science community (over the English system with pounds, miles, inches, ounces, etc)? |
Metrics is in a scale/intervals of 10’s – it’s easier to use. |
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Why is the Kelvin scale used for temperatures over the Celsius or Fahrenheit scale? |
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 10.0px Palatino}The Kelvin scale has NO negative values. |
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Show the formula that is used to convert from Celsius to Kelvin. |
K = ˚C + 273 |
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Explain what a qualitative measurement is AND provide an example.Qualitative measurements describe an object without numerical values. |
An example of this is “the basketball is orange.” |
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Explain what a quantitative measurement is AND provide an example.Quanitative measurements describe objects using numerical values |
“the basketball weighs 3.33 lbs.” |
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If you had a mixture of sugar and tiny glass beads (the same size as the grains of sugar), provide a detailed explanation for separating the two substances. |
a detailed explanation for separating the two substances.You would add water to the mixture to make the sugar dissolve; the glass would not. Then you would filter the glass beads away from the sugar water. And last, you could boil the water away from the sugar to isolate the sugar. |
