1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lana [24]
3 years ago
13

How many sig-figs in the following measurements?

Chemistry
1 answer:
DerKrebs [107]3 years ago
4 0

Answer:

1.605cm = 4 significant figures

16.050cm = 4 significant figures

16.050cm = 4 significant figures

12 + 12.5 + 125 = 149.5 = 4 significant figures

1.62 × 10^3/2.8 × 10^-5 = 1620/0.000028 = 11 significant figures

You might be interested in
Calculate the change in pH when 71.0 mL of a 0.760 M solution of NaOH is added to 1.00 L of a solution that is 1.0O M in sodium
Eddi Din [679]

Explanation:

It is known that pK_{a} value of acetic acid is 4.74. And, relation between pH and pK_{a} is as follows.

                    pH = pK_{a} + log \frac{[CH_{3}COOH]}{[CH_{3}COONa]}

                          = 4.74 + log \frac{1.00}{1.00}

So, number of moles of NaOH = Volume × Molarity

                                                   = 71.0 ml × 0.760 M

                                                    = 0.05396 mol

Also, moles of  CH_{3}COOH = moles of CH_{3}COONa

                                          = Molarity × Volume

                                          = 1.00 M × 1.00 L

                                          = 1.00 mol

Hence, addition of sodium acetate in NaOH will lead to the formation of acetic acid as follows.

            CH_{3}COONa + NaOH \rightarrow CH_{3}COOH

Initial :    1.00 mol                                  1.00 mol

NaoH addition:               0.05396 mol

Equilibrium : (1 - 0.05396 mol)    0           (1.00 + 0.05396 mol)

                    = 0.94604 mol                       = 1.05396 mol

As, pH = pK_{a} + log \frac{[CH_{3}COONa]}{[CH_{3}COOH]}

               = 4.74 +  log \frac{0.94604}{1.05396}

               = 4.69

Therefore, change in pH will be calculated as follows.

                         pH = 4.74 - 4.69

                               = 0.05

Thus, we can conclude that change in pH of the given solution is 0.05.

8 0
3 years ago
Electronegativity is :_______________
bixtya [17]

Answer:

c) the attraction of an atom for the electrons in a covalent bond.

Explanation:

Electronegativity, symbol χ, is a chemical property describing an atom's ability of to attract a shared pair of electrons to itself. It is influenced by the atomic number of the atom and the distance between the valence electrons and the charged nucleus. As the electronegativity number of atoms increases, the more the atom attracts electrons towards itself.

7 0
3 years ago
Read 2 more answers
Estimate the air pressure at an altitude of 5km
r-ruslan [8.4K]
The answer is 100 kg
6 0
3 years ago
Sunspots sit on the sun’s
Crank

The answer is Photosphere Apex.      

7 0
3 years ago
90.00 ml of 0.25 M calcium hydroxide are required to titrate 100.00 ml of hydrochloric acid. What is the molarity of the HCI?
bezimeni [28]

Answer:

50000mm u add subtract multiply divide

Explanation:

4 0
3 years ago
Other questions:
  • In this molecule, what's the formal charge on the central O atom?
    11·2 answers
  • Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. For each item, explain why th
    13·1 answer
  • A positively charged ion is called a cation which means there are more protons in the atom compared to the number of protons in
    14·1 answer
  • What does the empirical formula of a compound represent?
    13·1 answer
  • Water contained in a reservoir is controlled by a dam. The energy of the trapped water is
    6·1 answer
  • The equation for photon energy, E, is E=hc/λ
    7·1 answer
  • How do you convert from Fahrenheit to Celsius temperatures
    11·2 answers
  • Use your experimentally determined value of ksp and show,by calculations, that ag2cro4 should precipitate when 5ml of 0.004m agn
    6·1 answer
  • Help asap can some one help asap pls if you do all i will give brainliest
    7·1 answer
  • Identify the type of plant tissue that brings in gases:
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!