Check the statements that are a part of the Early Atomic Theory. a.Scientists believe that the atom is made up of elements. b.Atoms combine in whole number ratios to form compounds. c.Atoms cannot be created or destroyed during a chemical reaction.

Answers

Answer 1

Answer:

Answer: C

Explanation: Because it cannot, no one can create or destroy an atom, it just moves. It either bonds to another atom or it roams freely.

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Describe the results of Ernest Rutherford's gold-foil experiment and explain how his results changed ideas about the distribution of positive charge within the atom.

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Ernest Rutherford applies alpha particle towards an atom, some atom showed deflection by smaller angle, very few through large angle and many just passed without any deflection.

His results changed the idea for distribution of positive charges as he concluded almost all the positive charge is in center of the atom (inside nucleus) and it is very heavy than electrons which revolves outside the nucleus

Hope this helps!

Physicist Ernest Rutherford established the nuclear theory of the atom with his gold-foil experiment. When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense nucleus was causing the deflections.

Which set of properties does a substance such as CO2(g) have?

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Since CO2 (Carbon Dioxide) is a gas these properties would be: -no definite shape and volume. A gas is invisible and colorless to the human naked eye. An example of pure gas would be like air. Just like air, you see no definite shape and weight or volume.

Enter the molecular formula for butane, C4H10.
Express your answer as a chemical formula.

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Butane is from the family of alkanes with –ane as its family name. The but- prefix stands for having four carbon atoms. The C4H10 is the general formula of butane and can also represent other forms or structures of butane. However if the question asks for the molecular formula of butane, think of how many electrons it can share to the hydrogen atom. The carbon atom can share 4 and hydrogen 1. So if the three hydrogen atoms are attached to the first carbon, the other shared electron is attached to the second carbon. The second carbon atom can accommodate two hydrogen and 1 carbon. The third carbon can accommodate 2 hydrogen atoms and 1 carbon and the fourth carbon can accommodate 3 hydrogen atoms. The molecular formula is CH3-CH2-CH2-CH3.

Identify the following as True or False? 1. The limiting reactant is the reactant that is completely consumed in a chemical reaction.
2. The reactant in excess is any reactant that occurs in a quantity greater than that is required to completely react with the limiting reactant.
3. The amount of product can be calculated based on the amount of limiting reactant.

Answers

Answer :

(1) The limiting reactant is the reactant that is completely consumed in a chemical reaction. → True

(2) The reactant in excess is any reactant that occurs in a quantity greater than that is required to completely react with the limiting reactant. → True

(3) The amount of product can be calculated based on the amount of limiting reactant. → True

Explanation :

Excess reagent : It is defined as the reactants not completely used up in the reaction. The given moles are more than the required moles.

Limiting reagent : It is defined as the reactants completely used up in the reaction. The given moles are less than the required moles.

Theoretical yield : It is calculated from the amount of the limiting reagent present in the reaction.

Actual yield : It is experimentally determined.

All the given statements are true.

Final answer:

The limiting reactant is the reactant that is completely consumed in a chemical reaction. The reactant in excess is any reactant that occurs in a quantity greater than that required to completely react with the limiting reactant. The amount of product can be calculated based on the amount of limiting reactant.

Explanation:

1. True. The limiting reactant is the reactant that is completely consumed in a chemical reaction. It determines the amount of product that can be formed.

2. True. The reactant in excess is any reactant that occurs in a quantity greater than that required to completely react with the limiting reactant.

3. True. The amount of product can be calculated based on the amount of limiting reactant using stoichiometry.

Learn more about Limiting reactant here:

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What produces hydrogen ions as The only positive ions in aqueous solution

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Mostly acids produces H+ ions. Acids dissociates into ions when in aqueous form resulting to hydronium or hydrogen ions and the other ion which has a negative charge. For instance, hydrochloric acid, it dissociates into H+ and Cl-.

Does anyone know where i can find a practice cumulative chem test online?

Answers

exam board websites often have past papers from several previous years, if you know what exam board you are going to be using, try that, if not there may be content on the edexcel and AQA websites

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