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Anit [1.1K]
4 years ago
12

How many significant digits are in the volume measurement 0.010 mL? A) 1 B) 2 C) 3 D) 4 E) none of the above

Chemistry
1 answer:
fgiga [73]4 years ago
6 0

Answer:

The correct answer is option B.

Explanation:

Significant figures :These are figures in a number which expresses the value of the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Significant digits in the volume measurement 0.010 mL are:

0.0\bar{10} = 2 significant figures

  • All non-zero numbers are always significant.
  • All zero’s preceding the first integers are never significant.
  • All zero’s after the decimal point are always significant.
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When a 12.8 g sample of KCL dissolves in 75.0 g of water in a calorimeter the temp. drops from 31 Celsius to 21.6 Celsius. Calcu
Delicious77 [7]

Answer:

Step 1: Calculate qsur (the surrounding is

usually the water)

qsur = ? J

m = 75.0 g water

c = 4.184 J/g

oC

ΔT = (Tfinal- Tinitial)= (21.6 – 31.0) = -9.4 oC

qsur = m · c · (ΔT)

qsur = (75.0g) (4.184 J/g

oC) (-9.4 oC)

qsur = - 2949.72 J

First, using the information we know that we

must solve for qsur, which is the water. We know

the mass for water, 75.0g, the specific heat of

the water, 4.184 j/g

o

c, and the change in

temperature, 21.6-31.0 = -9.4 oC. Plugging it

into the equation, we solve for qsur.

Step 2: Calculate qsys qsys = - (qsur)

qsys = - (- 2949.72 J)

qsys = + 2949.72

In this case, the qsur is negative, which means

that the water lost energy. Where did it go? It

went to the system. Thus, the energy of the

system is negative, opposite, the energy of the

surrounding.

Step 3: Calculate moles of the substance

that is the system

Given: 12.8 g KCl

Mol system = (g system given)

(molar mass of system)

Mol system = (12.8 g KCl)

(39.10g + 35.45g)

Mol system = 12.8 g KCl

74.55 g

Mol system = 0.172

Here, we solve for the mol in the system by

using the molar mass of the material in the

system.

Step 4: Calculate ΔH ΔH = q sys .

Mol system

ΔH= + 2949.72 J

0.172 mol

ΔH= +17179.81 J/mol or +1.72 x 104

J/mol

i hope this helps

7 0
4 years ago
What do noble gases all have in common?
erastova [34]

Answer:

D. They react readily with oxygen in the air

3 0
3 years ago
What type of intermolecular forces are present in liquid methanol?
salantis [7]

Answer:

Hydrogen bonds

Explanation:

Hydrogen bonds are bonds formed in polar molecules in which an hydrogen atom is directly joined to a highly electronegative atom such as oxygen or nitrogen or fluorine.

A hydrogen bond is just an electrostatic attraction between a hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.

Methanol has a formula of CH₃OH and the hydrogen bond is between the H and O.

7 0
3 years ago
Edit the reaction by drawing all steps in the appropriate boxes and connecting them with reaction arrows. Add charges where need
gregori [183]

Answer:

Explanation:

Edit the reaction by drawing all steps in the appropriate boxes and connecting them with reaction arrows. Add charges where needed. Electron flow arrows should start on the electron(s) of an atom or a bond and should end on an atom, bond, or location where a new bond should be created. Include all free radicals by right-clicking on an atom on the canvas and then using the Atom properties to select the monovalent radical.

7 0
4 years ago
What are the answer??
MrMuchimi

Answer:?

Explanation:None

4 0
3 years ago
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