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
maw [93]
3 years ago
11

For the most effective hot pack, should the Temperature change be positive or negative ?

Chemistry
1 answer:
bazaltina [42]3 years ago
3 0

Answer:

Positive

Explanation:

For the most effective hot pack, the temperature change should be <u>positive</u>.

<em>Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.</em>

This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.

You might be interested in
________ are chemical messengers that are released by cells and transported in the bloodstream to alter the activities of specif
Reika [66]
You may be looking for neurotransmitters
3 0
3 years ago
Care to help me guys please​
earnstyle [38]

Answer:

A. Na₂SO₄ and HCl

C. Polar solutes are soluble in polar solvents but are insoluble in non-polar solvents Non-polar solutes are insoluble in polar solvents but are are soluble in non-polar solvents

Ionic solutes are soluble in polar solvents but are insoluble in non-polar solvents.

Like dissolves like simply means that molecules of substances having similar chemical properties dissolve in each other

Explanation:

A. Ionic substances like Na₂SO₄ are composed of charged particles called ions. These ions are either positively charged or negatively charged, therefore, they are attracted to substances of opposite charges. Also, polar molecules like HCl contains two oppositely charged ends. A polar solvent consists of molecules with two oppositely charged ends, therefore, ionic substances as well polar substances dissolve in them according to the concept of like dissolves like.

Gasoline being non-polar will only dissolve in like substances, polar solvents.

C. Polar solutes are soluble in polar solvents but are insoluble in non-polar solvents Non-polar solutes are insoluble in polar solvents but are are soluble in non-polar solvents

Ionic solutes are soluble in polar solvents but are insoluble in non-polar solvents.

The statement "Like dissolves like" simply means that molecules of substances having similar chemical properties dissolve in each other. For example gasoline, a non-polar substance will dissolve only in a non-polar solvent like kerosene. Also, HCl, a polar molecule will dissolve in a polar solvent like water.

7 0
2 years ago
The average person in the United States is exposed to the following amount of radiations annually. Rank the following source of
Papessa [141]
<span>#1 is air radon, #2 is x-ray, #3 is ground, #4 is cosmic radiation, #5 is TV tube, #6 is weapons test fallout . That's all I got hope I helped!</span>
8 0
3 years ago
Read 2 more answers
A balloon is filled with 35.0 L of helium in the morning when the temperature is 35.00 oC.
nexus9112 [7]

Answer: V = 33.9 L

Explanation: We will use Charles Law to solve for the new volume.

Charles Law is expressed in the following formula. Temperatures must be converted in Kelvin.

V1 / T1 = V2 / T2 then derive for V2

V2 = V1 T2 / T1

= 35 L ( 308 K ) / 318 K

= 33.9 L

5 0
2 years ago
How many significant digits are in 6.3590 x 107 mm?<br> 4<br> 5<br> 6
Verdich [7]
There are 5 significant figures in the following number. All of the numbers essentially are significant.
3 0
3 years ago
Read 2 more answers
Other questions:
  • 6. How is the law of conservation of mass shown by a balanced chemical equation?
    15·1 answer
  • What is the total number of moles of electrons needed to produce one mole of Mg metal from MgCl2?
    13·1 answer
  • Ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation:
    8·1 answer
  • What did Ernest Rutherford discover? How was his model different from Thomson’s?
    14·1 answer
  • What mass of calcium hydroxide is formed when 10.0g of calcium oxide reacts with 10.0g of water?
    6·1 answer
  • Do all cells have the same internal structures
    12·1 answer
  • Yvus UVILLE auuuulll
    6·2 answers
  • R.I.P too my brainly account lol..
    13·2 answers
  • Pls help I will give u points pls
    10·1 answer
  • Which of the following electron configurations represents an element that is MOST LIKELY to bond in a 1:1 ratio with calcium, Ca
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!