Answer the following question given this paragraph: Q: What is the process of action potentials in myelinated axons jumping between the nodes of ranvier called? Choices: - photoreactive conduction - saltatory movement - pinworm conduction - saltatory conduction A:
saltatory conduction
Answer the following question given this paragraph: Other applications of carbonates include glass makingwhere carbonate ions serve as a source of oxide ionsand synthesis of oxides. Hydrogen carbonates are amphoteric because they act as both weak acids and weak bases. Hydrogen carbonate ions act as acids and react with solutions of soluble hydroxides to form a carbonate and water: KHCO 3(aq) + KOH(aq) K 2 CO 3(aq) + H 2 O(l) With acids, hydrogen carbonates form a salt, carbon dioxide, and water. Baking soda (bicarbonate of soda or sodium bicarbonate) is sodium hydrogen carbonate. Baking powder contains baking soda and a solid acid such as potassium hydrogen tartrate (cream of tartar), KHC4H4O6. As long as the powder is dry, no reaction occurs; immediately after the addition of water, the acid reacts with the hydrogen carbonate ions to form carbon dioxide: HC 4 H 4 O 6 (aq) + HCO 3 (aq) C 4 H 4 O 6 2(aq) + CO 2(g) + H 2 O(l) Dough will trap the carbon dioxide, causing it to expand during baking, producing the characteristic texture of baked goods. Q: Substances that act as both weak acids and bases are said to be what? Choices: - amphiphilic - hygroscopic - atmospheric - amphoteric A:
amphoteric
Q: Answer the following question given this paragraph: Scientific experiments involve controls , or subjects that are not tested during the investigation. In this way, a scientist limits the factors, or variables that can cause the results of an investigation to differ. A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine their relationship with an observed phenomenon. Dependent variables are the observed phenomenon, and change in response to the independent variable. Controlled variables are also important to identify in experiments. They are the variables that are kept constant to prevent them from influencing the effect of the independent variable on the dependent variable. Q: Controlled variables are kept what to prevent them from influencing the effects of the independent variable on the dependent variable? Choices: - mechanical - temporary - fleeting - constant A:
A: constant
Question: Answer the following question given this paragraph: the current. Capacitors can be used to filter out low frequencies. For example, a capacitor in series with a sound reproduction system rids it of the 60 Hz hum. Q: Capacitors can be used to filter out low frequencies. for example, a capacitor in series with a sound reproduction system rids it of the 60 hz what? Choices: - white noise - vibration - echo - hum A:
Answer: hum
*Question*
Answer the following question given this paragraph: In everyday conversation, to accelerate means to speed up. The accelerator in a car can in fact cause it to speed up. The greater the acceleration, the greater the change in velocity over a given time. The formal definition of acceleration is consistent with these notions, but more inclusive. Average Acceleration Average Acceleration is the rate at which velocity changes,. Q: In scientific terms, average acceleration is the rate at which what changes? Choices: - direction - volume - gravity - velocity A:
**Answer**
velocity
*Question*
Answer the following question given this paragraph: Salts of Weak Bases and Strong Acids When we neutralize a weak base with a strong acid, the product is a salt containing the conjugate acid of the weak base. This conjugate acid is a weak acid. For example, ammonium chloride, NH4Cl, is a salt formed by the reaction of the weak base ammonia with the strong acid HCl: NH 3(aq) + HCl(aq) NH 4 Cl(aq) A solution of this salt contains ammonium ions and chloride ions. The chloride ion has no effect on the acidity of the solution since HCl is a strong acid. Chloride is a very weak base and will not accept a proton to a measurable extent. However, the ammonium ion, the conjugate acid of ammonia, reacts with water and increases the hydronium ion concentration: NH 4 +(aq) + H 2 O(l) H 3 O +(aq) + NH 3(aq) The equilibrium equation for this reaction is simply the ionization constant. Ka, for the acid NH 4 + :. Q: When we neutralize a weak base with a strong acid, the product is ________ containing the conjugate acid of the weak base. Choices: - an electron - an ion - water - salt A:
**Answer**
salt