Answer:
2.873 g of CO₂
Explanation:
This problem will be solved in two steps.
Step 1: Calculating mass of Octane:
Data Given:
Volume = 1 L = 1000 cm³
Density = 0.703 g/cm³
Mass = ??
Formula Used:
Density = Mass ÷ Volume
Solving for Mass,
Mass = Density × Volume
Mass = 0.703 g/cm³ × 1000 cm³
Putting Values,
Mass = 703 g
Step 2: Calculating Mass of Oxygen:
Data:
Volume = V = 5.0 L
Temperature = T = 25 °C = 298.15 K
Pressure = P = 1.0 atm
Moles = n = ?
Assuming that the gas is acting as Ideal gas so, we will use Ideal gas equation i.e.
P V = n R T
Solving for n,
n = P V / RT
Putting values,
n = 1.0 atm × 5.0 L / 0.0821 atm.L.mol⁻¹.K⁻¹ × 298.15 K
n = 0.204 moles
As,
Moles = Mass / M.Mass
So,
Mass = Moles × M.Mass
Mass = 0.204 mol × 16 g/mol ∴ M.Mass of O₂ = 16g.mol⁻¹
Mass = 3.26 g
Step 3: Calculating mass of CO₂:
The balance chemical equation is follow,
2 C₈H₁₈ + 25 O2 = 16 CO₂ + 18 H₂O
According to equation
228.45 g (2 mol) of C₈H₁₈ reacts with = 799.97 g (16 mol) of O₂
So,
703 g of C₈H₁₈ will react with = X g of O₂
Solving for X,
X = 703 g × 799.97 g ÷ 228.45
X = 2461 g of O₂
While, we are only provided with 3.26 g of O₂. This means O₂ is the limiting reactant and will control the yield of the final product. Therefore,
According to balance equation,
799.97 g (16 mol) of O₂ produced = 704.152 g (16 mol) of CO₂
So,
3.26 g (0.204 mol) of O₂ will produce = X g of CO₂
Solving for X,
X = 3.26 g × 704.152 g ÷ 799.97 g
X = 2.873 g of CO₂
B. Measurements can be made only on models.
C. Models help scientists visualize things they can’t see.
D. Models are perfectly accurate representations of objects.
E. Scientists can analyze models to make predictions.
Answer:
Option (C).
Models help scientists visualize things they can'tsee
Explanation:
Since a long time models have been used by scientists to study about various things and phenomenons. A model helps the scientist community understand things that they cannot actually see or fathom. It can be thought of as a thinking tool, to help form explanations. It represents physical and touchable visualization of the theory rather than imaginative.
Models are useful simplifications to aid understanding. It can then be used to explain further phenomena and to make predictions of future behavior. Hence, models are very helpful for scientists in various studies.
Answer:
AI-generated answerScientists use models for several reasons:
1. Models make some things easier to understand: Models are simplified representations of complex phenomena or systems. They help scientists break down complicated concepts into simpler components, making it easier to understand and study.
2. Models help scientists visualize things they can't see: Many scientific phenomena occur at scales that are too small or too large to observe directly. Models allow scientists to visualize these phenomena by creating representations that are more manageable and observable. For example, scientists use models to understand atomic structures or celestial bodies.
3. Scientists can analyze models to make predictions: Models provide a way for scientists to test and analyze various scenarios without directly manipulating the real system. By adjusting variables in the model, scientists can make predictions about how the real system might behave under different conditions. This allows them to gain insights and make informed decisions without the need for costly or time-consuming experiments.
4. Measurements can be made only on models: In certain situations, it may be difficult or impossible to make direct measurements on the real system. In such cases, scientists can create models that replicate the behavior of the system and make measurements on the model instead. This allows them to gather valuable data and draw conclusions about the real system. It is important to note that while models are valuable tools for scientific understanding, they are not always perfectly accurate representations of objects or phenomena. Models are simplified versions of reality, and they may not capture all the complexities or intricacies of the real system. Scientists continuously refine and improve models based on new evidence and observations.
Explanation:
The pencil's slim, lightweight structure and graphite core, known for its unique layering of carbon atoms via sp²-hybrid orbitals, are essential for its function of writing or drawing.
The structure of a pencil is tightly linked to its function. The pencil is made of a slim wooden case which is lightweight and easy to grip, enabling convenient writing or drawing. This wooden case houses a graphite center, the 'lead' of the pencil.
Why graphite? It is important to consider the properties of graphite. Graphite is soft and slippery, which allows it to easily leave marks on paper. Its structure consists of layers of carbon atoms, each connected to three others in a planar arrangement through sp²-hybrid orbitals. This layering structure allows for the graphite to be gradually worn away as the pencil writes, leaving a trail on the page, while the pencil reverts to its equilibrium state due to the torque produced by its weight.
So, in simple terms, the slim size, lightweight nature, and graphite core (with its unique structure and properties) are integral to a pencil's function of writing or drawing.
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Answer: it's a and D
Explanation:
Just answered it and got it right
Answer:
The more the precipitation which comes from the water, the more rain the clouds make witch effects vegetation and animals
Explanation: