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3 years ago

11

Compared to brasses, acids are generally more A. Reactive B. Bitter tasting C. Slippery

1 answer:

oksian1 [2.3K]3 years ago

7 0

u can't comment I think all are wrong

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If the alum reaction was done starting with 12.000 g of al, how many moles of hydrogen gas would be produced according to the ba

mylen [45]

0.67 moles of hydrogen gas.

5 0

3 years ago

All I need is the answer I don’t need any work shown, what is the pH= ?

jeka94

PH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. The pH of water is a very important measurement concerning water quality.

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3 years ago

A compressed gas cylinder ar 135 atm and 23°C is in a room wheree a fire occurs the fire raises the temperature of the gas to 47

yan [13]

Answer: 341.15atm

Explanation:Please see attachment for explanation

7 0

3 years ago

Approximately how many ice cubes must melt to cool 650 milliliters of water from 29°C to 0°C? Assume that each ice cube contains

qwelly [4]

Answer : The number of ice cubes melt must be, 13

Explanation :

First we have to calculate the mass of water.

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}$

Density of water = 1.00 g/mL

Volume of water = 650 mL

$\text{Mass of water}=1.00g/mL\times 650mL=650g$

Now we have to calculate the heat released on cooling.

Heat released on cooling = $m\times c\times (T_2-T_1)$

where,

m = mass of water = 650 g

c = specific heat capacity of water = $4.18J/g^oC$

$T_2$ = final temperature = $29^oC$

$T_2$ = initial temperature = $0^oC$

Now put all the given values in the above expression, we get:

Heat released on cooling = $650g\times 4.18J/g^oC\times (29-0)^oC$

Heat released on cooling = 78793 J = 78.793 kJ (1 J = 0.001 kJ)

As, 1 ice cube contains 1 mole of water.

The heat required for 1 ice cube to melt = 6.02 kJ

Now we have to calculate the number of ice cubes melted.

Number of ice cubes melted = $\frac{\text{Total heat}}{\text{Heat for 1 ice cube}}$

Number of ice cubes melted = $\frac{78.793kJ}{6.02kJ}$

Number of ice cubes melted = 13.1 ≈ 13

Therefore, the number of ice cubes melt must be, 13

3 0

4 years ago

The value of a scientific variable:

beks73 [17]

Answer:

A

Explanation:

4 0

3 years ago