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3 years ago

Physical science exam help

Chemistry

2 answers:

DiKsa [7]3 years ago

5 0

Answer:

b. let other scientists closely review her work

d. scatter plot

a. Chemical changes involve the breaking of bonds in molecules.

Explanation:

Scientists publish their work in peer reviewed journals such that their work can be replicated by independent labs all over the world, and as a result scientific consensus can be reached

Scatter plot shows both positive, negative and no correlation between different amount of products formed under different experimental conditions.

Chemical changes involves the formation of new bonds and breaking of old bonds such that new products are formed that are chemically completely different from the reactants. In a physical change there is no change in the chemical composition of the material but the substance undergoes a change in phase.

nataly862011 [7]3 years ago

4 0

Answer: B)

Explanation: I got this answer correct thanks to the help of the same answer above

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What is20 grams of HNO^3

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63.01284*20=1260.568

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a cube of iron (cp = 0.450 j/g•°c) with a mass of 55.8 g is heated from 25.0°c to 49.0°c. how much heat is required for this pro

krek1111 [17]

Q = ?

Cp = 0.450 j/g°C

Δt = 49.0ºC - 25ºC => 24ºC

m = 55.8 g

Q = m x Cp x Δt

Q = 55.8 x 0.450 x 24

Q = 602.64 J

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The potential energy diagram shows the gain and loss of potential energy as water molecules decompose into hydrogen and oxygen.

Dovator [93]

Answer:

The diagram with the five labels of the parts is in the image attached. Please, see the image.

Explanation:

1) General explanation: a potential chemical energy diagram is used to show how the reactants gain energy until they reach the activation energy, form the activated complex, and release part of the energy to form the products.

The difference between the chemical potential energy of the products and the reactants is the enthalpy of the reaction:

ΔH rxn = ΔH products - ΔH reactants.

The labels that correspond to each part of the diagram are explained next.

2) Reactants:

This is the substances at the start, so they appear on the left bottom side of the diagram.

3) Activation energy:

It is the energy that the reactants must reach (the highest point) in order to the reaction occurs.

4) Activated complex:

This is the intermediate state and of highest energy. The reactants have formed a complex at mid way between the reactants and the products.

5) Products:

These are the substances formed when the reaction is completed. They are lower in energy than the activated complex. They can be either higher or lower in energy than the reactants. The products are shown to the right of the diagram.

6) Enthalpy of the reaction:

The enthalpy of the reaction is the difference in energy of the products and the reactants. In this case, since, the products are higher in energy, it means that the reaction absorbed energy and it is an endothermic reaction.

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What is the empirical formula for ribose (C5H10O5)?

C. CH20

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Explain wether or not a reaction takes place when when bromine water is added to sodium chloride solution

CaHeK987 [17]

Answer:

When chlorine (as a gas or dissolved in water) is added to sodium bromide solution, the chlorine takes the place of the bromine. Because chlorine is more reactive than bromine, it displaces bromine from sodium bromide. The solution turns brown. ... The chlorine has gone to form sodium chloride.

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