09/18/20

I don not know how to explain 2 questions below. Help me, please!
1) A cup of water sits at room temperature in a fully insulated cup. Could you identify its heat? Explain! 2) The room temperature water is then poured into a cup of refrigerated... more
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09/17/20

How does increasing the mass of a substance while keeping the volume constant affect its density?
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09/17/20

Chemistry NEED HELP ASAP PLSS!
The table compares the characteristics of a substance in three different states of matter. Comparison of CharacteristicsCharacteristicState XState YState Z Average Speed of the... more
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09/17/20

Chemistry NEED HELP ASAP PLS!
Which of the following types of energy does an object have because of its position? (4 points) Kinetic energy Potential energy Radiant energy Sound energy
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09/17/20

Cesium-137, used in cancer treatment, has a half-life of 30 years.
Enter the balanced nuclear equation for the beta decay (0/-1e) of cesium-137.How many milligrams of a 36 mg sample of celsium 137 remain after 120 yearsExpress the mass to two significant figures... more
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09/17/20

Write a balanced nuclear equation for the alpha decay of each of the following:
bismuth-208 Express your answer as a nuclear equation.
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09/17/20

Determine the number of protons and number of neutrons in the nucleus of each the following.
Strontium - 88rubidium-84merury-200
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09/17/20

For the following neutral atoms, give the number of protons, neutrons, and electrons:
195/80 Hg129/53 I75/35 Br137/55 Cs196/78 Pt
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09/17/20

Calculate the mass of ammonia NH3 that contains a million 1.0 x 10^6 hydrogen atoms.
Calculate the mass of ammonia NH3 that contains a million 1.0 x 10^6 hydrogen atoms.Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.
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09/17/20

BUFFER SOLUTION P
What is the pH of the buffer formed by mixing 50.00 mL of 0.205 mol/L NaH2PO4 (Ka for H2PO4- = 6.32x10-8) with 50.00 mL of 0.111 mol/L NaOH.(Enter your answer to three significant figures. Ignore... more
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09/17/20

BUFFER SOLUTION pH
A buffer solution of pH 4.62 is to be prepared from acetic acid (with Ka = 1.80 x 10-5, sodium acetate and water. What must be the molar ratio of acetate ion to acetic acid in this solution to... more
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09/17/20

calculate the pH
25.00 mL of a solution containing 0.0997 M acetic acid (Ka = 1.75 x 10-5) is to be titrated with 0.129 M NaOH.CH3COOH + NaOH → CH3COONa + H2OCalculate pH after the addition of 25.85 mL of base.... more
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09/17/20

Calculate the mass of glucose C6H12O6 that contains a trillion 1.000 x 10^12 carbon atoms.
Calculate the mass of glucose C6H12O6 that contains a trillion 1.000 x 10^12 carbon atoms.Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
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09/17/20

How do I find the molarity and number of ions in this question

A 54.0 mL solution had 5.90g of MgCl2 and 2.10 g of NaHCO3 dissolved with it. What is molarity of NaHCO3 in solution? What is molarity of chloride ions in solution? how many ions are there in... more
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09/17/20

What is the effusion rate of hydrogen iodide?
Under the same conditions of temperature and pressure, does hydrogen iodide (HI) or ammonia (NH3) effuse faster? Calculate the relative rates at which they effuse. Ps. The effusion rate of ammonia... more
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09/17/20

You have 10g of pentane undergo combustion with 12g of oxygen , how many molecules of CO2 are produced?
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09/17/20

How do I solve this

A cereal contains 11.0g of sucrose her 60.0 g of cereal. How many grams of cereal must be eating to consume 0.0424 moles of sucrose
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09/15/20

A block of aluminum with a volume of 96.5 cm3 absorbs 69.5 J of heat.
If its initial temperature was 38.5 , what is its final temperature? (density of aluminum =2.70 )
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09/15/20

For the reaction 2 A + 4 B → 2 C + 4 D, what is the absolute magnitude of the rate of change for [B] when [C] is increasing at 2.0 M/s?
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09/15/20

A reaction has a rate law of Rate = (1.25 M⁻¹s⁻¹)[A][B]. What is the rate of the reaction if [A] = 0.301 M and [B] = 0.280 M?
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09/15/20

What is the rate for the first order reaction A → Products when [A] = 0.201 M? (k = 0.360 1/min)
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09/15/20

The second order reaction A → Products takes 13.5 s for the concentration of A to decrease from 0.740 M to 0.205 M. What is the value of k for this reaction?
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09/15/20

What is the rate constant of a first-order reaction if the half-life is 2.50 min?
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09/15/20

For the reaction A(g) → B(g) + 4 C(g), what is the rate of pressure change for C if the pressure change for A is -0.050 atm/s?
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09/15/20

For the reaction A + 2 B → 3 C + D, what is the magnitude of the rate of change for [B] when [C] is increasing at 4.6 M/s?
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