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1. In an investigation into the action of catalase in potato 20 g of potato tissue was put into a small beaker containing hydrogen peroxide.?

i.  About four grams, because that's about how much mass was removed from the system.  I am assuming that most of the removed mass was oxygen gas that escaped ii About .5 minutes.  See the time at which the...

3 Answers · Science & Mathematics · 18/11/2019

2. How many hydrogen atoms are in 6.40 mol of ammonium sulfide?

Formula ---> (NH4)2S (6.40 mol) (6.022 x 10^23 formula units/mol) = 3.85408 x 10^24 formula units of (NH4)2S There are 8 H atoms per formula unit of (NH4)2S (3.85408 x 10^24) (8) = 3.08 x 10^25 atoms (to...

1 Answers · Science & Mathematics · 02/07/2020

3. Did women on the Bikini Islands wear bikinis before the first Hydrogen Bomb explosion?

Doubtful. The first bikinis appeared just after World War II. Early examples were not very different from the women's two pieces common since the 1920s, except that they had a gap below the...

5 Answers · Arts & Humanities · 12/01/2020

4. A 200. cm^3 sample of hydrogen oxygen gas is collected at 92.3 kPa and 30. C. What is the new volume (cm^3) if the conditions change to STP.?

Exact question: https://answers.yahoo.com/question/index?qid=20200522022256AA4g9c5

3 Answers · Science & Mathematics · 22/05/2020

5. Decomposition of hydrogen peroxide, percentage yield of oxygen is 93%. What is the actual yield gm of oxy if you start with 100. g H2O2?  ?

(100. g H2O2) / (34.015 g H2O2/mol) x (1 mol O2 / 2 mol H2O2) x (0.93) x (31.99886 g O2/mol) = 43.7 g O2

4 Answers · Science & Mathematics · 07/12/2019

6. If 30 g of hydrogen peroxide decomposes completely, what volume of oxygen gas is formed at STP?  a. 19.77 L b. 24.46 L c. 9.89 L d.10.79 L ?

2 H2O2 → 2 H2O + O2 (30 g H2O2) / (34.01468 g H2O2/mol) x (1 mol O2 / 2 mol H2O) x (22.414 L/mol) = 9.88 L So answer c.

1 Answers · Science & Mathematics · 08/06/2020

7. A electron in a hydrogen atom absorbs51.09 x 10 -20 J of energy If the electron originated at energy level 2 to what level was it excited?

Planck constant, h = 6.626 × 10⁻³⁴ J s Speed of light, c = 3.00 × 10⁸ m/s Rydberg constant, R = 1.097 × 10⁷ m⁻¹ n₂ = ?  to  n₁ = 2 E = hc/λ  and  Rydberg equation: 1/λ = R [(1...

1 Answers · Science & Mathematics · 21/09/2020

8. How to balance phosphorus pentachloride reacting with water yielding hydrogen phosphate and Hydrochloric acid by LCM method?

I can find several references to PCl3 reacting with water to form phosphorous acid (H3PO3), but none to it forming H3PO4. The equation for the reaction forming phosphorous acid is: PCl3 + 3 H2O --> H3PO3 + 3...

2 Answers · Science & Mathematics · 13/09/2020

9. An unknown compound was found to have a %composition of 67.67% carbon, 9.8% hydrogen and 22.5% oxygen. What is its empirical formula? ?

Assume you have 100g of the substance so that all the percentages become grams  Take the grams of each substance and divide by its molar mass (i.e. 12.01 for carbon) From the results, divide each of them by the smallest answer...

2 Answers · Science & Mathematics · 10/02/2020

10. What can I use to wash blood off the front and undercarriage of my truck? Will plain old soap and water work? Will hydrogen peroxide work?

Use a high pressure hose, soap and water with a splash of bleach for that pesky DNA.

4 Answers · Politics & Government · 02/06/2020

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