Consider this experiment. A scientist fills a glass container with water and places an aquatic plant inside the container, then closes the lid and places the container in direct sunlight. The scientist observes small bubbles on the surfaces of the plant’s leaves on days 1 and 2, but no bubbles on day 3.11. If the scientist concludes that the bubbles were caused by photosynthesis, then which reactant should be added to the water in order for the bubbles to reappear?

Question

6co2 + 6h2o -----> c6h12o2 + 6o2

Answer 1

In photosynthesis, carbon dioxide (CO₂) and water (H₂O) are the reactants that produce glucose (C₆H₁₂O₆) and oxygen (O₂) as products. The equation you provided reflects this process:

\[ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \]

Since the scientist observed bubbles, which are likely oxygen bubbles resulting from photosynthesis, and the bubbles stopped appearing on day 3, it is possible that the concentration of carbon dioxide in the water was depleted.

To encourage the reappearance of the bubbles, the scientist should add carbon dioxide (CO₂) to the water in the container. This addition would provide the aquatic plant with the necessary reactant to resume the process of photosynthesis and produce oxygen again, leading to the formation of bubbles on the leaves of the plant.

Answer 2

12. Using the chemical equation for photosynthesis, choose the correct number of atoms from the drop down box for the element shown in the reactants and products.

6co2 + 6h2o -----> c6h12o2 + 6o2

REACTANTS: Carbon Hydrogen Oxygen

PRODUCTS: Carbon Hydrogen Oxygen

Answer 3

To analyze the chemical equation for photosynthesis:

\[ 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 \]

Let's count the number of atoms for each element in the reactants and products:

Reactants:

• Carbon (C):
  • From \(6CO_2\): \(6 \times 1 = 6\) carbon atoms
• Hydrogen (H):
  • From \(6H_2O\): \(6 \times 2 = 12\) hydrogen atoms
• Oxygen (O):
  • From \(6CO_2\): \(6 \times 2 = 12\) oxygen atoms
  • From \(6H_2O\): \(6 \times 1 = 6\) oxygen atoms
  • Total Oxygen: \(12 + 6 = 18\) oxygen atoms

Products:

• Carbon (C):
  • From \(C_6H_{12}O_6\): \(6\) carbon atoms
• Hydrogen (H):
  • From \(C_6H_{12}O_6\): \(12\) hydrogen atoms
• Oxygen (O):
  • From \(C_6H_{12}O_6\): \(6\) oxygen atoms
  • From \(6O_2\): \(6 \times 2 = 12\) oxygen atoms
  • Total Oxygen: \(6 + 12 = 18\) oxygen atoms

Summary:

Now we can fill in the counts:

REACTANTS:

• Carbon: 6
• Hydrogen: 12
• Oxygen: 18

PRODUCTS:

• Carbon: 6
• Hydrogen: 12
• Oxygen: 18

Thus, the correct number of atoms for each element in the reactants and products is:

• Reactants:

  • Carbon: 6
  • Hydrogen: 12
  • Oxygen: 18

• Products:

  • Carbon: 6
  • Hydrogen: 12
  • Oxygen: 18

Answer 4

13-15. Match each phrase to the correct biochemical process.

This chemical reactions is driven by the absorption of solar energy in sunlight.

This chemical reaction uses oxygen gas and releases stored energy.

The sugars produced from this process can be used immediately or stored for growth or later use.

Answer 5

Here are the matches for each phrase to the correct biochemical process:

1. This chemical reaction is driven by the absorption of solar energy in sunlight.

   • Photosynthesis: This process occurs in plants, algae, and some bacteria, where sunlight is absorbed to convert carbon dioxide and water into glucose and oxygen.

2. This chemical reaction uses oxygen gas and releases stored energy.

   • Cellular Respiration: This process occurs in all aerobic organisms, where oxygen is used to break down glucose to release energy in the form of ATP.

3. The sugars produced from this process can be used immediately or stored for growth or later use.

   • Photosynthesis: Again, this refers to photosynthesis, where glucose (a sugar) is produced and can be utilized right away or stored for future energy needs.

Summary of Matches:

1. Photosynthesis
2. Cellular Respiration
3. Photosynthesis

Answer 6

16. Identify the products and reactants of cellular respiration.

glucose

carbon dioxide gas

oxygen gas

water

Answer 7

Cellular respiration is a process by which cells convert glucose (and sometimes other organic molecules) into usable energy in the form of adenosine triphosphate (ATP). The overall equation for cellular respiration can be summarized as follows:

\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (ATP)} \]

Reactants:

• Glucose (C₆H₁₂O₆): This is the primary fuel molecule.
• Oxygen gas (O₂): This is required for aerobic cellular respiration.

Products:

• Carbon dioxide gas (CO₂): This is a waste product released into the atmosphere.
• Water (H₂O): This is another product formed during cellular respiration.
• Energy (ATP): While energy is not typically listed as a product, it is the main purpose of the process.

Summary:

• Reactants: Glucose (C₆H₁₂O₆) and Oxygen gas (O₂)
• Products: Carbon dioxide gas (CO₂), Water (H₂O), and Energy (ATP)

Answer 8

which of the following are autotrophs?

Birds, Grass, Fox, Sparrowhawk, Rabbit

Answer 9

Autotrophs are organisms that can produce their own food through processes such as photosynthesis or chemosynthesis, using inorganic substances. In contrast, heterotrophs are organisms that cannot produce their own food and must consume other organisms for energy.

From your list, the only autotroph is:

• Grass: As a plant, it performs photosynthesis to create its own food.

The others on the list are all heterotrophs:

• Birds (e.g., sparrowhawk): Heterotrophs that eat other organisms.
• Fox: A heterotroph that hunts and eats prey.
• Sparrowhawk: A bird of prey that consumes other animals.
• Rabbit: A herbivore that consumes plants but does not produce its own food.

Summary:

• Autotrophs: Grass
• Heterotrophs: Birds, Fox, Sparrowhawk, Rabbit

Answer 10

are blackbarries an autotroph

Answer 11

Yes, blackberries (the fruit from the blackberry plant, Rubus fruticosus) are considered autotrophs. As plants, blackberry plants produce their own food through the process of photosynthesis. They use sunlight, carbon dioxide from the air, and water from the soil to create glucose (a form of sugar) and oxygen. This ability to convert inorganic substances into organic matter through photosynthesis classifies them as autotrophic organisms.