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dybincka [34]
2 years ago
9

What would be the definition of chemical indicators?​

Chemistry
1 answer:
Gwar [14]2 years ago
5 0

Answer:

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

Explanation:

You might be interested in
calculate the mass of butane needed to produce 64.1 g of carbon dioxide to three significant figures and appropriate units
cricket20 [7]

Answer:

21.2 gm

Explanation:

calculate the mass of butane needed to produce 64.1 g of carbon dioxide to three significant figures and appropriate units

butane is the hydrocarbon C4H10  

in combustion, we react hydrocarbons with O2 to form CO2 and H2O

so

C4H10  + O2---------------->  CO2 + H2O

BALANCE

2C4H10 + 1302--------> 8CO2 + 10 H2O

the molar mass of CO2 is 12 + 16X2 = 44

64.1 gm of CO2 is

64.1/44 = 1.46 MOLES OF  CO2,

FOR EVERY 8 MOLES OF CO2 WE NEED 2 MOLES OF BUTANE  IT IS A

8:2 OR 4:1 RATIO.  THE MOLES OF C4H10 ARE 1/4 THE MOLES OF CO2

SO

THE MOLES OF C4H10 H10 ARE 1.46/4 =0.365 MOLES

THE MOLAR MASS OF BUTANE IS 58.12

0.365 MOLES OF C4H10 HAS A MASS OF 0.365 X 58.12 = 21.2 gm

6 0
3 years ago
Which compound contains both ionic and covalent
netineya [11]
The answer is (1) CaCO3. The bond between C and O is covalent bond. And the bond between Ca2+ and CO3 2- ion is the ionic bond. So the compound CaCO3 satisfy this condition.
4 0
3 years ago
Read 2 more answers
At a certain temperature 3.24 moles of co2 gas at 2.15atm takes up a volume of 35.28 what is the temperature in celsius
andrew-mc [135]

Answer:

The temperature is 12.35 C.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

  • P= 2.15 atm
  • V= 35.28 L
  • n= 3.24 moles
  • R= 0.082 \frac{atm*L}{mol*K}
  • T= ?

Replacing:

2.15 atm* 35.28 L= 3.24 moles* 0.082\frac{atm*L}{mol*K} * T

Solving:

T=\frac{2.15 atm* 35.28 L}{3.24 moles* 0.082\frac{atm*L}{mol*K}}

T=285.5 K= 12.35 C (being 273.15 K= 0 C)

<u><em>The temperature is 12.35 C.</em></u>

3 0
3 years ago
Given the following equation: 2H2O 2H2 +0g What mass of oxygen would form from 5 moles of water?​
Anna35 [415]

Answer:

Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.

Explanation:

6 0
2 years ago
What is the molarity of the solution with a volume of 8.26 Liters and 9.870 moles?
stiv31 [10]

Answer: 1.19 M

Explanation:

molarity = (moles of solute)/(liters of solution) = 9.870 / 8.26 = 1.19 M

3 0
2 years ago
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