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Need help with chemistry please.
A 12.5 gram walnut is burned under 100 ml of water....
A 12.5 gram-walnut is burned under 101 mL of water. How many calories did the water...
A 12.5 gram-walnut is burned under 101 mL of water. How many calories did the water absorb if its temperature went from 22.5 degrees celsius to 95.5 degrees celsius?
It takes 100,000 calories to raise 1 kilogram of water by 100 degree C. How many...
It takes 100,000 calories to raise 1 kilogram of water by 100 degree C. How many calories does it take to raise the temperature of an equal volume of lead by 100 degree C? And how many calories to raise an equal weight of lead by 100 degree C? Explain the difference between a calorie and a Calorie. What units are used to describe the heat (or energy)value of food? A ten foot pole is jammed under a 200 pound...
6. (20 pts) You have a beaker containing 100 mL of water. The initial temperature of...
6. (20 pts) You have a beaker containing 100 mL of water. The initial temperature of the water is 20°C. (Note: Onc ml = 1 cm'). 2. You place a piece of copper into the beakct containing. When you do, the water level increases to 110.5 m... What is the mass of the copper in grams? b. If the temperature of the water increases to 35°C, how much heat (in calories) did the copper add to the water? c. You...
I need help with this question, please. What A chemistry graduate student is given 100. mL...
I need help with this question, please.
What A chemistry graduate student is given 100. mL of a 1.10 M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with Ka = - 10 =4.9 x 101 mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8.95? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your...
need help solving this, show work please 7. If 100 grams of water at 90°C and...
need help solving this, show work please
7. If 100 grams of water at 90°C and 40 grams of water at 10°C are mixed, what is the final temperature of the mixture? (Assume no heat lost to, or gained from the surroundings and that the specific heat of water is 1 cal/gm-°C)
I need help with 8 & 9 please. - ZOOM + 1. A 20.0-gram piece of...
I need help with 8 & 9 please.
- ZOOM + 1. A 20.0-gram piece of aluminum at 0.0°C is dropped into a calorimeter containing some hot water. The temperature of the water drops from 90.0°C to 75.0°C. What is the mass of water in the calorimeter? 2. When 13.0 grams of solid NaOH dissolves in 400.0 grams of water in a coffee-cup calorimeter, the temperature of the water rises from 22.2°C to 30.3°C. What is q? What is AHxn...
Need help please SOLUTION MAKING in water. Calculate the amount of NaCl you need to weigh...
Need help please
SOLUTION MAKING in water. Calculate the amount of NaCl you need to weigh out. 1 (a). You need 500mL of 15% (w/v) NaCl 1(b) What approximate volume of water would you dissolve the NaCl in? Please give a range of volumes. 1(c). Assuming that adding the NaCI to your original volume of water caused the volume to increase by 50mL before you added additional water to reach your final volume, what is the DENSITY of your final...
the date you need is: 2.0 grams of KNO3, the temp was 22.1. extra information that might help if you need it: I added 5 mL of water to the 2.0 g of KNO3. please answer the 3 parts of the question. T...
the date you need is: 2.0 grams of KNO3, the temp was
22.1.
extra information that might help if you need it: I added 5 mL
of water to the 2.0 g of KNO3.
please answer the 3 parts of the question. Thanks.
Grams KNO,Cryst. Temp, °c 22.1 2.0 g Type your calculation for solubility (in grams KNO,/100 grams water) using the data for the 2.0 gram sample. Type your calculation for molality of KNO, (in mol KNO3/kg water) using...
i need help with number 7 please Questions: Yes or No: Is the Gram stain 100%...
i need help with number 7 please
Questions: Yes or No: Is the Gram stain 100% accurate? 1. NO 2. Yes or No: Is the KOH test 100% accurate? NO 3. Yes or No: Is the vancomycin test 100 % accurate? NO 4. What cell structure causes the stringing in the KOH test? (a) the cell wall, (b) the lipopolysaccharide,(c) the DNA, (d) proteins, (e) mucus 5. Why is a Gram stain result important for treating physicians? (a) for prescribing...
need help with the calculations please. Paragraph Styles Font Section Please type your name here: Please...
need help with the calculations please.
Paragraph Styles Font Section Please type your name here: Please be am work below. I would recommend wing your work on a piece of arch and then nping any work below. For dimensional analysis, please either insert an equation or we the notation below as an example for the common or 234 Tartan i Word select "Insert and then "Equation Data and Calculations: 1kg Record data for Steps 1-8 here. For steps 9-13, do...
It takes 100,000 calories to raise 1 kilogram of water by 100 degree C. How many calories does it take to raise the temperature of an equal volume of lead by 100 degree C? And how many calories to raise an equal weight of lead by 100 degree C? Explain the difference between a calorie and a Calorie. What units are used to describe the heat (or energy)value of food? A ten foot pole is jammed under a 200 pound...
6. (20 pts) You have a beaker containing 100 mL of water. The initial temperature of the water is 20°C. (Note: Onc ml = 1 cm'). 2. You place a piece of copper into the beakct containing. When you do, the water level increases to 110.5 m... What is the mass of the copper in grams? b. If the temperature of the water increases to 35°C, how much heat (in calories) did the copper add to the water? c. You...
I need help with this question, please.
What A chemistry graduate student is given 100. mL of a 1.10 M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with Ka = - 10 =4.9 x 101 mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8.95? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your...
need help solving this, show work please
7. If 100 grams of water at 90°C and 40 grams of water at 10°C are mixed, what is the final temperature of the mixture? (Assume no heat lost to, or gained from the surroundings and that the specific heat of water is 1 cal/gm-°C)
I need help with 8 & 9 please.
- ZOOM + 1. A 20.0-gram piece of aluminum at 0.0°C is dropped into a calorimeter containing some hot water. The temperature of the water drops from 90.0°C to 75.0°C. What is the mass of water in the calorimeter? 2. When 13.0 grams of solid NaOH dissolves in 400.0 grams of water in a coffee-cup calorimeter, the temperature of the water rises from 22.2°C to 30.3°C. What is q? What is AHxn...
Need help please
SOLUTION MAKING in water. Calculate the amount of NaCl you need to weigh out. 1 (a). You need 500mL of 15% (w/v) NaCl 1(b) What approximate volume of water would you dissolve the NaCl in? Please give a range of volumes. 1(c). Assuming that adding the NaCI to your original volume of water caused the volume to increase by 50mL before you added additional water to reach your final volume, what is the DENSITY of your final...
the date you need is: 2.0 grams of KNO3, the temp was
22.1.
extra information that might help if you need it: I added 5 mL
of water to the 2.0 g of KNO3.
please answer the 3 parts of the question. Thanks.
Grams KNO,Cryst. Temp, °c 22.1 2.0 g Type your calculation for solubility (in grams KNO,/100 grams water) using the data for the 2.0 gram sample. Type your calculation for molality of KNO, (in mol KNO3/kg water) using...
i need help with number 7 please
Questions: Yes or No: Is the Gram stain 100% accurate? 1. NO 2. Yes or No: Is the KOH test 100% accurate? NO 3. Yes or No: Is the vancomycin test 100 % accurate? NO 4. What cell structure causes the stringing in the KOH test? (a) the cell wall, (b) the lipopolysaccharide,(c) the DNA, (d) proteins, (e) mucus 5. Why is a Gram stain result important for treating physicians? (a) for prescribing...
need help with the calculations please.
Paragraph Styles Font Section Please type your name here: Please be am work below. I would recommend wing your work on a piece of arch and then nping any work below. For dimensional analysis, please either insert an equation or we the notation below as an example for the common or 234 Tartan i Word select "Insert and then "Equation Data and Calculations: 1kg Record data for Steps 1-8 here. For steps 9-13, do...
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