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
vovangra [49]
4 years ago
15

Read this for the next two problems: When a 125 g obsidian rock is placed into a graduated

Chemistry
1 answer:
alekssr [168]4 years ago
3 0

Answer:

29. Option (b) 32 mL

30. Option (d) 3.9 g/mL

31. Option (d) 13.195 g

Explanation:

29. Determination of the volume of the rock.

Volume of water = 15 mL

Volume of water + Rock = 47 mL

Volume of Rock =.?

Volume of Rock = (Volume of water + Rock) – (Volume of water)

Volume of Rock = 47 – 15

Volume of Rock = 32 mL

30. Determination of the density of the rock.

Density of a substance is simply defined as the mass of the substance per unit volume of the substance. It can be represented mathematically as:

Density (D) = mass (m) /volume (V)

D = m/V

With the above formula, the density of the rock can be obtained as follow:

Mass (m) of Rock = 125 g

Volume (V) of Rock = 32 mL

Density (D) =?

D = m/V

D = 3.9 g/mL

Therefore, the density of the rock is 3.9 g/mL.

31. Determination of the sum of 3.7 g and 9.495 g.

The sum of 3.7 g and 9.495 g can be obtained as follow:

3.7 g + 9.495 g = 13.195 g

You might be interested in
The molecule carbon disulfide CS2 is nonpolar and has only london dispersion forces between the molecules.Carbon tetrachloride C
SSSSS [86.1K]

Answer:- Melting point of [tex[CCl_4[/tex] is higher than CS_2 where as the vapor pressure of CS_2[/tex[ is higher than [tex]CCl_4 .

Explanations:- Since both the molecules are non polar, the forces of attraction for carbon tetrachloride are comparatively stronger as it's a bigger molecule. We know that, stronger are the forces of attraction, higher is the melting point as more heat is required to break the bonds.

Stronger are the forces of attraction, lower is the vapor pressure as the molecules are more tightly bonded and less molecules goes to the gas phase.

So, melting point of carbon tetrachloride is higher but it's vapor pressure is lower as compared to carbon disulfide.

3 0
4 years ago
Read 2 more answers
16. The exothermic reaction between liquid hydrazine (N,H) and liquid hydrogen peroxide is used to
Xelga [282]

Answer and Explanation:

N2H2 + H2O2 = N2 + 2 H2O  2.7747 moles of HOOH (hydrogen peroxide)=5.5494 moles of H2O  

7 0
3 years ago
Identify the oxidising and reducing agents in these reactions, by looking at the gaming and loss of ovygen.
Maru [420]

Answer:

A is oxidation . B is reduction

Explanation:

A will be oxidation agent because there is gain of

electrons

B will be reducing agent because there is loss of

electrons.

6 0
2 years ago
An object with a mass of 20.0 kg has a force of 5.0 Newton's applied to it. What is the resulting acceleration of the object?
Arisa [49]

Answer:

1/4

Explanation:

force/mass

5/20=1/4 abs

8 0
3 years ago
3. Describe nuclear fission. What happens to the atomic number, mass number, protons, neutrons? Be able to write the reaction eq
MaRussiya [10]

Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts (lighter nuclei). The fission process often produces free neutrons and photons (in the form of gamma rays), and releases a large amount of energy. In nuclear physics, nuclear fission is either a nuclear reaction or a radioactive decay process. The case of decay process is called spontaneous fission and it is very rare process. In this section, the neutron-induced nuclear fission, the process of the greatest practical importance in reactor physics, will be discussed.

Fusion reactions between light elements, like fission reactions that split heavy elements, release energy because of a key feature of nuclear matter called the binding energy, which can be released through fusion or fission. The binding energy of the nucleus is a measure of the efficiency with which its constituent nucleons are bound together. Take, for example, an element with Z protons and N neutrons in its nucleus. The element’s atomic weight A is Z + N, and its atomic number is Z. The binding energy B is the energy associated with the mass difference between the Z protons and N neutrons considered separately and the nucleons bound together (Z + N) in a nucleus of mass M. The formula is

B = (Zmp + Nmn − M)c2.

5 0
3 years ago
Other questions:
  • Which diagram represents an object at static equilibrium?
    7·1 answer
  • What is the mass of 23 moles of lithium atoms
    6·1 answer
  • Atoms that have a positive or negative electrical charge are called ________.
    15·1 answer
  • A projectile moves horizontally with ____?____motion<br> HELP PLEASE
    12·1 answer
  • What is the answer to...
    14·1 answer
  • You have a stock solution of HNO3 with a concentration of 4.5 x 10^-4 M. However, you need 275 ml of a 2.50 x 10^-5 M solution.
    8·1 answer
  • Which of the following is an example of physical weathering?
    5·1 answer
  • In a laboratory, a student combines vinegar and baking soda into a beaker. The initial temperature is 28 degrees Celsius and the
    12·1 answer
  • What must organisms do in order to survive in the world? Check all that apply
    7·2 answers
  • Calculate the pH of a solution with [H+] = 2.52 x 10^-5.​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!