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
vfiekz [6]
3 years ago
7

2000 joules are required to heat 125 grams of an unknown substance from 10 c to 28 c. What is the specific heat of the substance

?

Chemistry
1 answer:
Delicious77 [7]3 years ago
3 0
Hello! Specific heat is the amount of energy required by known amount of substance to raise its temperature by one degree celsius. In our question it is given that 2000J energy when supplied to 125 g of unknown substance raised its temperature by 18 oC. So, The specific heat is calculated as follow;

You might be interested in
At a certain temperature, Kc = 0.0500 and ∆H = +39.0 kJ for the reaction below, 2 MgCl2(s) + O2(g) → 2MgO(s) + Cl2(g) Calculate
Minchanka [31]

Explanation:

Since, it is shown that the reaction has been reversed. Therefore, value of K_{c} will become \frac{1}{K_{c}}.

Hence, new K_{c'} = \frac{1}{K_{c}}

                                      = \frac{1}{0.0500}

                                      = 20

Also, the number of moles of each reactant has been halved. So, K_{c''} for the reaction MgO(s) + \frac{1}{2}Cl2(g) → MgCl_{2}(s) + \frac{1}{2} O2(g) will also get halved.

Therefore,     K_{c''}  = K_{c'} = (20)^{0.5}

                               = 4.47

As the value of \Delta H is given as +39.0 kJ. So, it means that the reaction is endothermic in nature. So, energy of reactants will be more than the products. Hence, according to Le Chatelier's principle reaction will move in the forward direction.

As a result, K_{c} will also increase with increase in temperature.

6 0
3 years ago
Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc? Ca → ZnCO3
artcher [175]
Ca + ZnCO3 → CaCO3 + Zn
3 0
3 years ago
Read 2 more answers
When biological samples of unknown origins are discovered at a crime scene, what should investigators do?a. assume no pathogens
adoni [48]

Answer: assume pathogens are present and treat the samples accordingly

Explanation:

When investigators are unable to conclusively ascertain the source of a biological sample found at a crime scene, the correct thing to do is to treat it as if pathogens are present in it and handle it according to set rules on how to handle pathogens.

This is done to ensure that if a pathogen is indeed present, it would not cause a health emergency by infecting those who come in contact with the samples at the scene.

3 0
3 years ago
Unrestricted populations of organisms experience _____.
Fudgin [204]
Unrestricted populations of organisms experience Exponential growth. 

As a population reaches is carrying capacity there is an increase in competition for All of the above.
 Hope I helped. 
5 0
2 years ago
Read 2 more answers
What model would represent individual atoms of different types that repeat to form a crystal
Law Incorporation [45]

Answer:

Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures. Examining the crystal structure is very important in determine

Explanation:

7 0
2 years ago
Read 2 more answers
Other questions:
  • Which best describes an element?
    6·2 answers
  • 2 HI(g) ⇄ H2(g) + I2(g) Kc = 0.0156 at 400ºC 0.550 moles of HI are placed in a 2.00 L container and the system is allowed to rea
    5·1 answer
  • 150.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How long will it take
    12·1 answer
  • Imagine you pour some hot soup into a bowl. You place your hands on the outside of the bowl and feel that the bowl is very warm.
    14·1 answer
  • A colorless solution is known to contain one of these ions. Which ion is present if adding dilute HCl produces a white precipita
    10·1 answer
  • during a rising tide, ocean waves often become larger. if the amplitude of a wave increases by a factor of 1.1, by how much does
    8·1 answer
  • The sodium atom loses an electron to form a sodium Ion (Na+). Which statement is correct with respect to its atomic radius?
    8·1 answer
  • Temperature and kinetic energy have a relationship.
    15·2 answers
  • How many liters of C3H6O are present in a sample weighing 25.6 grams?
    11·1 answer
  • How much heat is needed to warm 250g of water from 22°C to 98°C ?​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!