Expansion and Contraction of Matter

b) When popping corn is heated, water inside the kernels becomes a a gas and expands. This creates the pressure to pop a kernel. This is a physical change because the water is just changing state from a liquid to a gas. There is no new substance produced, the popcorn is in a new shape and the water in a new state. Although it cannot be reversed, it can still be a physical

The objective of the experiment “Keeping it Liquid” was to figure out what it takes to keep a compound in a liquid form which caused a phase change. A phase change is when a substance changes from one state or phase to another. There are three main phases that normally occur and they are called Evaporation, Deposition, and Melting. Evaporation is where a liquid changes to a gas. An example of evaporation is when water drops form on the glass of a cold drink on a warm day. Deposition is where a gas vapor goes directly into the solid phase without becoming a liquid first. An example of Deposition often occurs on windows during the winter months. While Melting is where a solid turns into a liquid. Melting occurs when ice turn into a liquid when

Pour the 20mL of Hydrochloric acid into the Zip-lock® bag and hold it upright so none of the liquid pours

After 5 min passed the plastic container created a thin layer of ice surrounding the container.

Physical changes occurred in four out of the eight experiments completed in this lab. The first was experiment one, the salt and water. The salt was added to water but when the water evaporated the salt remained. The water changed to the vapor form of water and the salt did not change. The second was experiment two, the candle. When the candle was lit the heat given off from the fire melted the wax beneath it. Melting is a physical change because the liquid wax is still wax, its usual form is just a solid. Experiment four dealt with ripping paper. This was a physical change because, although the paper was being ripped apart, it was (and still is) paper. The smaller pieces did not change the mass or any other factor of it except the surface area of each piece. Experiment seven dealt with vinegar being added to milk. The vinegar did not change but the milk was curdled by the vinegar. Although the milk was curdled, the milk remained milk. The composition stayed the same. Each of these experiments showed no change in a substance so as it changed to another substance.

Shake the bottle for the oils to mix evenly. Put the tightly closed bottle in a dark bottle in a cupboard for a day where the temperature is not more that 75 degrees Fahrenheit.

    The height of the liquid dropping from the dropper may have been from the same height if the hand was resting on the table/desk for each drop of sodium chloride, however the angles the liquid was dropped and where (on which part of the penny) it was dropped may make a difference in results. It may interfere with the amount of force on the water on top of the penny to cause it to move and overflow. Another error may be with the amount of liquid dispersed on the penny each time (in one squeeze of the dropper) which also associates with the amount of force exerted as the dropper was squeezed.  A solution this would be to use a dropper than only disperses a certain amount of liquid at a time (the pressure or force of the squeeze does not make a difference to how much liquid is released). This would provide more accurate results and not create

That’s how Alan explains to me the impressive number of water bottles under the sink in Erik’s prefab home. Attack. Invasion. I found out it is just a routine emergency measure. In case the water freezes inside the pipes in the morning cold.

Fill granulated cylinder with water by submerging and make sure no bubbles at the top.

few tablespoons of water, and then cover with a plastic wrap. Let this heat for

Put the measure baking soda in the corner of the plastic bag, sealing with a twist tie.

Procedure: Cut top off 2 liter bottle and bottom off another. Fill the one without a top with water and put a

The volume is definite if the temperature and pressure are constant. When a solid is heated above its melting point, it becomes liquid, given that the pressure is higher than the triple point of the substance. Intermolecular (or interatomic or interionic) forces are still important, but the molecules have enough energy to move relative to each other and the structure is mobile. This means that the shape of a liquid is not definite but is determined by its container. The volume is usually greater than that of the corresponding solid, the most well known exception being water, H2O. The highest temperature at which a given liquid can exist is its critical temperature.[5]

Place the 5 bags labeled as “F” in the freezer, 5 bags labeled “RT” on the kitchen counter and 5 bags labeled “OT” in open climate(Outside)

An increase in internal energy is required to convert a solid to a liquid,. Conversely, a reduction in internal energy can cause liquids to freeze or solidify. When heat is added to a solid or a liquid, the temperature of the sample does not necessarily rise. During a phase change, heat is added to the sample without an increase in temperature. Heat absorbed or released as the result of a phase change is called latent heat. There is no temperature change during a phase change, thus there is no change in the kinetic energy of the particles in the material. Latent heat is an intensive