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
SCORPION-xisa [38]
3 years ago
14

A sample of a substance has a mass of 27.3 grams and a volume of 7.0 centimeters3. The density of this substance is _____ grams/

centimeter3.
Chemistry
2 answers:
statuscvo [17]3 years ago
7 0

The density is defined as mass of a substance per unit of its volume

It can be expressed in different units like g/L  g/m3  Kg/dm3 etc

We are given that

mass of substance = 27.3 grams

volume of substance = 7 cm^3

the density = Mass of substance / volume of substance

density = 27.3g / 7 cm^3  = 3.9 g /cm^3

Ira Lisetskai [31]3 years ago
4 0

density = mass/volume=27.3/7=3.9

You might be interested in
Is the reaction between methane and oxygen endothermic or exothermic? Explain why we burn fossil fuels, such as natural gas.
vladimir1956 [14]
The thing that governs whether a reaction is exothermic is the energy given out / used up to break / form the bonds in the reaction. 

<span>When two substances react, the bonds in those substances first break up, releasing energy, before re-forming in a different way, taking in energy. The nature of the bonds that are broken up and reformed determines whether more energy is given out (exothermic) or taken in (endothermic)</span>
6 0
3 years ago
How much heat must be removed from 456 g of water at 25.0°c to change it into ice at?
N76 [4]
This question can be simply solved by using heat formula,
    Q = mCΔT

Q = heat energy (J)
m = Mass (kg)
C = Specific heat capacity (J / kg K)
ΔT = Temperature change (K)

when water freezes, it produces ice at 0°C (273 K)
hence the temperature change is 25 K (298 K - 273 K)
C for water is 4186 J / kg K or 4.186 J / g K
By applying the equation,
 Q = 456 g x 4.186 J / g K x 25 K
     = 47720.4 J
     = 47.72 kJ

hence 47.72 kJ of heat energy should be removed.
5 0
3 years ago
Based on the kinetic molecular theory, which of the following statements is correct about a sample of gas at a constant temperat
Scilla [17]

Answer:

C) It has a constant average kinetic energy

Explanation:

The average kinetic energy of the particles in a gas is directly proportional to the temperature of the gas, according to the equation.

k is the Boltzmann's constant

T is the absolute temperature of the gas

Therefore, temperature of a gas is a measure of the average kinetic energy of the particles.

In this problem, we are told that the gas is at constant temperature (and volume): therefore, according to the previous equation, this means that the average kinetic energy is also constant.

8 0
3 years ago
Which of the following would be appropriate reason(s) for scientists to reject atomic theory?​
leonid [27]
It posed a contradiction to Quantum Theory
3 0
3 years ago
Read 2 more answers
What is chemical reaction?<br>​
Aliun [14]

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction

3 0
2 years ago
Read 2 more answers
Other questions:
  • 1) An aerosol can contains gases under a pressure of 4.50 atm at 20.0 degrees Celsius. If the can is left on a hot, sandy beach,
    6·1 answer
  • What will the final volume of a gas be if it is heated from 9 K to 117 K, and the initial volume is 85.5 L?
    12·1 answer
  • A radioactive element is half disintegrated in 40 minutes. What is the time required for the decay of 75% of the element
    6·1 answer
  • A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the g
    15·1 answer
  • Identify balance chemical equation from the following
    10·1 answer
  • If you quickly plunge a room-temperature mercury thermometer into very hot water, what will happen to the mercury level?\
    5·1 answer
  • What new information can you add to your definition of chemical change
    6·1 answer
  • Parrotfish live in the ocean and eat plantlike organisms called algae. Sunlight is shining on the
    9·2 answers
  • 2. Katelyn is drinking a glass of tea. As the tea sits in the sun it begins to warm up. To
    12·2 answers
  • Jen and her partner were assigned the Zn/Zn cathode/anode pair which they used to construct their electrolytic cell. They decide
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!