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When a nucleus emits an alpha particle, the atomic number (increases or decreases)? by (1),(2),(3),(4)? and the mass number (increases) or (decreases)? by (1),(2),(3,)(4)?
Hint: the words or numbers in parentheses with a question mark behind them are the viable answers.
Given that the enthalpy of formation is -277.7 kJ/mol for C2H5OH(l) and -393.5 kJ/mol for CO2(g), find the enthalpy of formation for C6H12O6.
When you turn on more lights and appliances in your home, the current in the circuits is greater. Why is this, given that you are adding more resistance with each component?
A solution of HCl is found to be 0.5277 N and 39.65 mL of its equivalent to 20.65 of standard NaOH. a. What is the normality of NaOH
What is the OH- in a solution that has a pH of 4.92? Give your answer to 3 significant figures using E-notation (i.e., 1 number before and 2 after the decimal point)
Describe the preparation of 2.00 L of a 6.75 ppm NO3 solution from the salt Al(NO3)3.
1. Draw an orbital overlap diagram to represent the bonding in ammonia, NH3.
Problem- What is the pH of a solution that is 0.30 M in acetic acid, HC2H3O2, and 0.70 M in sodium acetate, NaC2H3O2, at 25 degrees C.
how much energy is required to turn 500 g of ice at -15.0 celsius to liquid water at 55.0 celsius? specific heat (ice) = 2.10 J/g * C. Specific heat (water)= 4.18 J/g*C
The value of Δo for the complex [Cu(CH3NH2)4]2& + is 15210 cm-1. Determine whether this complex would favour tetrahedral or square planar geometry and by how much. The answer should be in units of cm-1.
A 643 mL gas sample at STP is compressed to a volume of 285 mL, and the temperature is increased to 26C. What is the new pressure of the gas in Pa? Answer in units of Pa.
The sodium content of a urine specimen was found by using an ion selective electrode. The subsequent values were obtained: 102, 97, 99, 98,101,106 mM. Explain what are the 95% confidence limits for the sodium concentration
Find the formal concentration of the acid in each phase when 100 mL of 0.10 M aqueous acid is extracted with 25 mL of octanol at pH 4.00 in water.
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