The salt in this experiment forces its way into the ice cube, therefore bonding with small particles of the ice molecules to raise the freezing point. Since the salt has a higher concentration then the ice causing the ice to dry and become hard to melt. The sugar intrudes the
Why? The reaction in Test 2 was defiantly a chemical change, because it started with two powders and as you kept mixed the energy/temperature changed quickly to cold and the odor was very strong like ammonia and as it was chemically changing. It turned into this milky substance that was ice cold. 6. Was the reaction in Test 3 a physical or chemical change?
This theory states that the shape of the active site changes to the correct shape when the substrate binds to the enzyme. When the products of the reaction are formed, they no longer fit the shape of the active site and fall away from the enzyme active site. The enzyme then reverts back to the original shape, until another substrate molecule collides. Below is a diagram showing the induced-fit model. Both models show why enzymes are not changed by the reactions that they catalyse and provide an explanation as to why enzymes can be continually re-used.
Explain what it means to denature an enzyme. -To denature an enzyme means to change its shape by breaking the hydrogen bonds that holds its shape, thus rendering it useless. An enzyme can be denatured with heat, or with a change in pH. 5. What factors did you need to control in your tests?
Lab Report- Grand Central Equation Introduction In this experiment, we created Zinc Iodide yet again. However, this time we did it through different means which caused a different kind of reaction. Better said, in this lab we learned that reactions can take multiple steps to go into completion. We also analyzed which was the more efficient way to generate Zinc Iodide. Focus Question Should chemists prepare Zinc Iodide, from its elements or from a Double Replacement Reaction between Barium Iodide and Zinc Sulfate?
Each of these types of reactions behaves in a similar fashion. They all involve the conversion of one substance to another substance, while preserving the original elements in some form. Another aspect of predicting products is the chart of reactivity. In order for the replacement of an element in a compound to happen, the element replacing the original element must be more reactive. The chart of reactivity tells chemists the comparable reactivity of elements.
Reaction rate is affected by any catalysts present (which speed up the reaction usually with an intermediate step), temperature (increases the number of particles collisions), concentration (increases the number of collisions), and surface area (increases the space available for collisions). Reactions can only occur when collisions take place. The most generic form of the rate law is Rate = K * [A]m * [B]n where (k is a constant specific to an equation and temperature). Now, the compounds A and B might not have any effect on the rate, which would cause them to drop out of the equation completely, or they might have so much effect that they are raised an order (squaring the concentration). The rate law for this reaction is k [CV+]m[OH-]n. Since the hydroxide ion concentration at the beginning is about 1000 times larger than the concentration of crystal violet, [OH-] will not change that much during this
What do you think would happen to the temperature of the ice if you added 6 tablespoons of salt instead of 2 tablespoons? 5. If there are charged particles that can move around in a substance, that substance is able to conduct electricity. So, do ionic compounds or covalent compounds conduct electricity when dissolved in water? Explain.
Introduction: In Stoichiometry, you can figure out how much product is produced from a chemical reaction by using the starting amount of a substance, while using math. Stoichiometry is the study of the relationships or ratios between two or more substances undergoing a physical or chemical change (Helmenstine). Since all reactions are dependent on how much was started with, we use those numbers to get the product number. In a limiting reactant problem, an amount is given for both the reactants. The smaller amount will ‘limit” how much the reactant can produce.
More complicated relationships between equations are handled as follows: if equation x is multiplied by a constant, then Hx is also be multiplied by that constant; if an equation must be reversed, thenHx must be negated. In this lab you will perform three related reactions using known concentrations of common chemicals. Measuring temperature changes will allow you to determine the heats of reaction. Because the reactions take place at constant pressure, the heat of reaction must equal the enthalpy change, which allows you to write thermochemical equations. By applying Hess’s law to the first two reactions, you will be able to calculate the enthalpy change for the third reaction and compare it to the value you obtained experimentally.