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pentagon [3]
3 years ago
13

10. If you were running an experiment to determine the temperature at

Chemistry
1 answer:
Wittaler [7]3 years ago
6 0

Answer:

The temperature at which each bean is kept

Explanation:

Independent variable is what YOU CHANGE

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How many grams of solid Na2CO3 are required to neutralize exactly 2 liters of an HCI solution of pH 2.0?
Snezhnost [94]

Answer:

The answer is 1.06g.

Explanation:

Analysis of question:

1. Identify the information in the question given.

  • volume of HCl is 2 dm3
  • pH of HCl is 2.0

2. What the question want?

  • mass of Na2CO3 is ?(unknown)
  • 3. Do calculation.
  • 1st-Write a balanced chemical equation:

Na2CO3 + 2HCl (arrow) 2NaCl + H20 + CO2

  • 2nd-Determine the molarity of HCl with the value of 2.0.

pH= -log[H+]

2.0= -log[H+]

log[H+]= -2.0

[H+]= 10 to the power of negative 2(10-2)

=0.01 mol dm-3

molarity of HCl is 0.01 mol dm-3

  • 3rd-Find the number of moles of HCl

n=MV

=0.01 mol dm-3 × 2 dm3

=0.02 mol of HCl

  • 4th-Find the second mol of it.

Based on the chemical equation,

2.0 mol of HCl reacts with 1.0 mol of Na2CO3

0.02 mol of HCl reacts with 0.01 mol of Na2CO3

<u>N</u><u>a</u>2CO3>a=<u>1</u><u> </u>mol

<u>2</u><u>H</u>Cl>b=<u>2</u><u> </u>mol

  • 5th-Find the mass of it.

mass= number of mole × molar mass

g=0.01 × [2(23)+ 12+ 3(16)]

g=0.01 × 106

# =1.06 g.

3 0
3 years ago
Describe the three temperature scales used in the laboratory and in everyday life: the Fahrenheit, Celsius, and Kelvin scales.
yuradex [85]

Explanation:

<u>Fahrenheit Scale </u>

Fahrenheit temperature scale is the scale which is based on:

(a) For freezing point of the water, 32 °F.

(b) For boiling point of the water, 212 °F.  

With interval between two being divided into equal 180 parts.

<u> Celsius Scale </u>

Celsius temperature scale is the scale which is based on:  

(a) For freezing point of the water, 0 °C

(b) For boiling point of the water, 100 °C.

With interval between two being divided into equal 100 parts.

<u>Kelvin Scale </u>

It denotes the triple point of water where the solid, liquid, and gas phases exist in equilibrium which is at 273.16 K.

kelvin is defined as 1/ 273.16 of triple point temperature.

6 0
3 years ago
What is a supersaturated solution?
sergey [27]

Supersaturation is a solution that contains more of the dissolved material than could be dissolved by the solvent under normal circumstances. It can also refer to a vapor of a compound that has a higher (partial) pressure than the vapor pressure of that compound.

5 0
3 years ago
The dissolution of barium hydroxide in water is an exothermic process. Which of the following statements is correct?A) The entha
madreJ [45]

Answer:

B

Explanation:

An exothermic reaction is one in which heat is liberated to the surrounding by a reaction.In this case,the enthalpy of the product is less than that of the reactant and such  a reaction has a negative enthalpy (ΔH).

8 0
3 years ago
Read 2 more answers
Describe two ways you think a sound wave could be stopped or could change change direction.
Alla [95]

Answer:

Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. Rather, a sound wave will undergo certain behaviors when it encounters the end of the medium or an obstacle. Possible behaviors include reflection off the obstacle, diffraction around the obstacle, and transmission (accompanied by refraction) into the obstacle or new medium

8 0
2 years ago
Read 2 more answers
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