Properties of matter, Density, Specific heat, Classification, State of Matter Flashcards
If water starts to freeze at 0 degrees Celsius, what would be its temperature when completely frozen?
0 degrees Celsius
In which state of matter are particles spread out uniformly and randomly?
Gas
What is the formula for calculating density?
Density = Mass/Volume
If the mass of a substance increases while the volume remains the same, what will happen to the density?
The density will increase
Which of the following materials likely has the lowest density?
Air
In a chemical reaction, what state of matter does not hold a definite shape but has a definite volume?
Liquid
Why does a cork float on water?
Its density is less than that of water
The specific heat capacity of water is 4.184 J/g°C. How much heat is absorbed when 500g of water is heated from 20°C to 90°C?
147300 J
Differentiating water and mercury using their specific heat is because…
Each substance has a unique specific heat
If a substance has a high specific heat, it means…
It needs more heat to increase its temperature
Why are substances with high specific heats often used for heat storage?
They can absorb lots of heat without getting too hot
What does the specific heat of a substance indicates about that substance?
Its resistance to temperature changes
What does specific heat refer to in a substance?
The energy needed to change the temperature of 1g by 1°C
In calculating specific heat, which one is the ‘amount of heat’ variable in the formula q=mcT?
q
If two substances have the same mass, receive the same amount of heat, but have different specific heat capacities, what will be different?
Their resulting temperatures will be different
What is the process of a liquid turning into a gas called?
Evaporation
The specific heat of lead is 0.129 J/g°C. If 400 g of lead absorbs 10,320 J of heat, what is the temperature change?
200°C
What happens to molecules of a gas during condensation?
They slow down and come closer together
An object has a volume of 20 cm3 and a mass of 100 g. What is its density?
5 g/cm3
In an exothermic reaction, if 300 grams of substance X with a specific heat of 0.897 J/g°C releases 1500 J of heat energy, what is the temperature change?
5.57°C
If two substances, A and B, have the same mass, which would require more energy to raise its temperature if A has a higher specific heat than B?
Substance A
How do we calculate specific heat in Chemistry?
q = mcΔT
How does temperature generally affect the density of a liquid or gas?
Density decreases as temperature increases
Gold has a density of approximately 19.3 g/cm³. How does this compare to the density of water (1g/cm³)?
Gold is denser than water
