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Cloud [144]
3 years ago
6

during which step of the scientific method does a scientist make an educated guess about the outcome of an experiment

Chemistry
2 answers:
wariber [46]3 years ago
7 0

hypothesis statement or the very beginning.

AURORKA [14]3 years ago
7 0

Answer:

The answer is Hypothesis

Explanation:

To perform a scientific method, first the scientist must (1)observe an event of the environment, then, he goes on to the (2)introduction where the observed is analyzed and a question is generated, about the "Why?" of the facts. It is here that the scientist happens to make a supposition known as (3)hypothesis, which must be (4)experienced and (5)demonstrated to finally obtain (6)conclusions about it.

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Answer:

The internal energy of a system <u>is the sum of the potential and kinetic energies of the components</u>

Explanation:

Internal energy is defined as the sum of two types of energy: kinetic energy and potential energy.

Kinetic energy is defined as the sum of all the kinetic energies that each element has within a system with respect to its center of mass. It is caused by the movement of particles. Meanwhile, the potential energy is the energy that is associated with each of the interactions. Potential energy is associated with the constituents of matter, of the electrostatic energy of each atom that is inside the molecules.

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3 years ago
Which reaction is balanced correctly?
mixas84 [53]

C3H8 + 5O2 → 3CO2 + 4H2O .

This reaction is balanced correctly because number of atoms on reactant side and product side are same.

5 0
3 years ago
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What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3
kvv77 [185]

Answer:

6.79 g of phosphine can be produced

Explanation:

The reaction is this:

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We have the mass of the two reactants, so let's find out the limiting reactant, so we can work with the equation. Firstly, we convert the mass to moles (mass / molar mass)

6.2 g / 30.97 g/mol = 0.200 moles of P

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Ratio is 3:2.

3 moles of hydrogen react with 2 moles of P

Then, 2 moles of H₂ would react with (2 . 2)/ 3 = 1.3 moles of P.

We have only 0.2 moles of P, so clearly the phosphorous is the limiting reactant.

Ratio is 2:2. So 2 moles of P can produce 2 moles of phosphine. Therefore, 0.2 moles of P must produce the same amount of phosphine.

Let's convert the moles to mass ( mol . molar mass)

0.2 mol . 33.97 g/mol = 6.79 g

3 0
3 years ago
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stepladder [879]
The answer that complete the sentence is "Arrhenius base".

The complete sentence is: A substance that increases the concentration of hydroxide ions in aqueous solution is an Arrhenius base.

Arrhenius' acid and base model says that an acid is a substance that contains hydrogen and ionizes in aqueous solution producing protons (H+) and a base is a substance that cointains hydroxide and release it in aqueous solution.
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3 years ago
What is an ecosystem?
Yakvenalex [24]
An ecosystem is a large community of living organisms (plants, animals and microbes) in a particular area. The living and physical components are linked together through nutrient cycles and energy flows. Basically where they live
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