Question

In: Chemistry

a. What sign of a positive chemical reaction will be observed in the "Reactions of Known...

a. What sign of a positive chemical reaction will be observed in the "Reactions of Known Solutions" tests?
b. What three test reagents will be used? Write their correct chemical formulas

Solutions

Expert Solution

The purpose of this experiment was to study the reactions of elements/ions when exposed to other known solutions. As, stated before we can identify elements in the same group or family because they have similar chemical reactions. Barium, Calcium and Strontium showed a positive reaction to precipitation when exposed to ammonium carbonate and ammonium sulfate; Lithium, Potassium and Sodium had no reaction. All six elements/ions (Ba, Ca, Li, K, Na,Sr) had a negative reaction when exposed to ammonium phosphate. The family or group that showed a positive precipitation test was the alkaline earth metals.


Related Solutions

What are “hallmarks” of chemical reactions, that is,how can you observe that a chemical reaction has...
What are “hallmarks” of chemical reactions, that is,how can you observe that a chemical reaction has taken place?
What are the main chemical reactions involved in AMD formation? What is the “initiator reaction” and...
What are the main chemical reactions involved in AMD formation? What is the “initiator reaction” and the “propagation cycle”? Why is this cyclical nature (regeneration of Fe2+) problematic? How do microbes play a role in these reactions? What is “yellow boy”? Oxidation of Fe2+ is very slow at low pH values. Why does this reaction occur then in acidic environments?
What are the main chemical reactions involved in AMD formation? What is the “initiator reaction” and...
What are the main chemical reactions involved in AMD formation? What is the “initiator reaction” and the “propagation cycle”? Why is this cyclical nature (regeneration of Fe2+) problematic? How do microbes play a role in these reactions? What is “yellow boy”? Oxidation of Fe2+ is very slow at low pH values. Why does this reaction occur then in acidic environments?
Predict the sign of entropy change (positive or negative) for the following processes/reactions A) a lake...
Predict the sign of entropy change (positive or negative) for the following processes/reactions A) a lake freezing B) SO2(g) + CaO(s) → CaSO3(s) C) NH3(g) + HCl(g) → NH4Cl (s) D) 4 CO2 (g) + 2 H2O (g) → 2 C2H2 (g) + 5 O2(g) E) N2H4 (g) → N2(g) + 2 H2(g) Please Help!! Answer all of the parts!! Thank You!!
1- Chemical bonds are broken and reformed in all chemical reactions. A reaction that results in...
1- Chemical bonds are broken and reformed in all chemical reactions. A reaction that results in the release of energy is referred to as Select one: a. Exergonic b. Dangerous c. Endergonic d. Activation e. Photosynthesis 2- In lab, catalase will be used to initiate a particular chemical reaction that breaks hydrogen peroxide down into water and oxygen gas. Which is the substrate in this reaction? Select one: a. Hydrogen b. Catalase c. Hydrogen peroxide d. Water e. Oxygen gas...
How does energy play a role in chemical reactions and describe its role in a chemical reaction
How does energy play a role in chemical reactions and describe its role in a chemical reaction that you have seen or done in your everyday life.(endothermic and exothermic reactions)
3. Chemical reactions and equilibrium constants (a) An alternative way of writing the reaction for the...
3. Chemical reactions and equilibrium constants (a) An alternative way of writing the reaction for the dissolution of CdCO3(s) is to form the species HCO3- rather than CO32-. Write a balanced chemical reaction for CdCO3(s) dissolution with HCO3- rather than CO32- as a product species. Calculate an equilibrium constant and standard free energy of reaction for your new reaction. You will need to look up some equilibrium constants. (b) How would you decide which reaction to use to describe the...
Many chemical reactions release energy. Suppose that at the beginning of a reaction, an electron and...
Many chemical reactions release energy. Suppose that at the beginning of a reaction, an electron and proton are separated by 0.135 nm , and their final separation is 0.105 nm . How much electric potential energy was lost in this reaction (in units of eV)?
Enzymes catalyze chemical reactions by Altering the equilibrium point of a reaction Making a non-spontaneous reaction...
Enzymes catalyze chemical reactions by Altering the equilibrium point of a reaction Making a non-spontaneous reaction spontaneous Stabilizing the transition state Being used up in the chemical reaction Disulfide bridges are formed by Cysteine side chains hydrogen-bonded Methionine side chains covalently bonded Cysteine side chains covalently bonded Methionine side chains hydrogen-bonded DNA is a polymer of ______ while proteins are polymers of _______ Glucose, acetyl-CoA Nucleotide, amino acids Nucleotides, fatty acids Sugars, amino acids
1. A chemist observed a gas being evolved in a chemical reaction and collected some of...
1. A chemist observed a gas being evolved in a chemical reaction and collected some of it for analysis. It was found to contain 80% carbon and 20% hydrogen. It was also observed that 500. mL of the gas at STP weighed 0.6695 g. What is the empirical formula for the compound? What is its molecular formula? 2. The ratio of an unknown gas effuses at a rate that is 0.325 times that of argon gas. Calculate the molar mass...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT