Question

1. analyze: 1. one way to test what kind of gas is in the cylinder is to use a splint test. a glowing splint is a wooden stick that has been lit on fire and then blown out, resulting in a glowing, red - hot tip. a burning splint is a splint that has a burning tip. the table shows how a splint reacts to some common gases:

gas	carbon dioxide (co₂) or ammonia (nh₃)	oxygen (o₂)	hydrogen (h₂)
burning splint	goes out	continues to burn	small explosion and \pop\ sound

a. drag the glowing splint next to the cylinder, and observe. what do you see?
b. click reset and click play, and then bring the burning splint to the cylinder. what happens now?
c. based on the table above, what gas do you think was produced in this reaction?

1. interpret: turn on show chemical equation. a chemical equation is a shorthand way to describe a chemical reaction. symbols represent the elements: h for hydrogen, o for oxygen, and na for sodium. the reactants are to the left of the arrow, and the products are to the right. for example, the equation h₂ + o₂ → h₂o shows that the reactants hydrogen and oxygen combine to form the product h₂o, or water.

a. look at the reaction shown in the gizmo. what are the reactants in this reaction?
b. what are the products in this reaction?
these symbols represent sodium hydroxide and hydrogen gas. sodium hydroxide is a strong base. (chemicals that contain the hydroxide ion (oh⁻) are bases.)
c. how do the products of the reaction relate to the phenol red test and the splint test?

Explanation:

Step1: Analyze glowing splint test

If the gas is carbon - dioxide or ammonia, the glowing splint goes out. If it's oxygen, the glowing splint ignites, and if it's hydrogen, it does not ignite. We need to observe the result of the glowing - splint test for part A.

Step2: Analyze burning splint test

For carbon - dioxide or ammonia, the burning splint goes out. For oxygen, it continues to burn, and for hydrogen, there is a small explosion and a "pop" sound. Observe the result for part B.

Step3: Identify gas based on tests

Based on the results of parts A and B, match with the table to identify the gas for part C.

Step4: Identify reactants

In a chemical equation, reactants are on the left - hand side of the arrow for part 5A.

Step5: Identify products

Products are on the right - hand side of the arrow in a chemical equation for part 5B.

Step6: Relate products to tests

For part 5C, consider the properties of the products (sodium hydroxide and hydrogen gas) and how they would interact with the phenol red test (sodium hydroxide is a base and would affect the pH indicator) and the splint test (hydrogen gas has a characteristic reaction with a burning splint).

Answer:

A. [Answer based on actual observation of glowing splint test]
B. [Answer based on actual observation of burning splint test]
C. [Gas identified based on A and B results]
5A. [Reactants from the chemical equation]
5B. [Products from the chemical equation]
5C. [Explanation of how products relate to tests]