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The elements potassium and sodium have similar chemical properties because they have the same number of valence electrons and form +1 ions.
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Answer:
Proust's law of definite proportion
Explanation:
The law of constant proportion states that the components elements of a given chemical compound combine with each other in a fixed mass ratio when the compound is produced by any given process
Therefore, from the question, the chemical formula for Nitrogen Dioxide is NO₂, where the molar mass of nitrogen, N = 14
The molar mass of oxygen, O = 16
Given that one molecule of NO₂, contains one atom of nitrogen and two atoms of oxygen, one mole of NO₂ will contain 14 grams of nitrogen and 32 grams of oxygen, according to Proust's law of definite proportion.
By changing only one variable in an experiment, and holding all other factors exactly the same, any change in the result of the experiment can be more likely attributed to the changed variable. This increases the validity of the experiment.
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Answer:
Explanation:
Generally, the factors that affect rate of chemical reactions include
- pressure (affects non-solid reactants)
- surface area of solid reactants
- concentration of reactants
- presence/absence of catalysts
From the above, it shows that some of these factors do not need to be considered when discussing rate of reaction of gases of equal moles as we have in the question.
The factors that will determine the difference in the reaction rates of the gases in the two syringes will just be temperature of the syringes (if the temperature of the syringes are not the same) and the pressure applied on the gases in the syringes (if the pressure applied to the syringes are not the same). If catalyst is introduced to one and not to the other, that will be increase the rate of the reaction in the one the catalyst is introduced and hence the reaction rate varies.
An increase in temperature and/or pressure will lead to an increase in the rate of reaction.
