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lawyer [7]
3 years ago
12

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry
1 answer:
Novosadov [1.4K]3 years ago
6 0

1.) Which of the following is a molecule but not a compound?

A.He

"He" or helium is an initial for a single element and a compound has more than one element.

2.) What is a physical combination of substances?

A.a mixture

When two substances are combined they result in a compound.

3.) What is a chemical combination of substances?

A. they form a compound

When two chemical elements are combined they form a compound.

4.) What is the relationship between the solute and solvent in a solution?

B.they form a mixture

Solutes are dissolved into the solvent which results in a mixture.

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What is the room temperature of water?
inn [45]
I surmise that the person who asked this question was wondering why water in a room may sometimes be colder than ambient air and by how much. 

For water to get cooler than ambient air requires two conditions: exposed water surface or water able to seep through a clay pot, and relatively low ambient humidity level (usually lower than 30% relative humidity). These two conditions combined enable evaporation. Now, evaporation of liquid water into water vapor necessitates input of latent energy (2257 kJ/kg), and this is at the expense of the remaining liquid water. Thus, liquid water in a room can be at a temperature lower than room temperature.

<span>By how much?  There is no straight answer to this because the temperature of the remaining liquid water depends on (1) the rate of evaporation, which itself depends on the amount of surface exposure and the room humidity and temperature, (2) the amount of water remaining in the pot, and (3) the rate of reheating of the water by the ambient air.  In practice, the water temperature can be lower than room temperature by several degrees Celsius. </span>
4 0
3 years ago
A single atom of platinum has a mass of 3.25 x 10-22g. What is the mass of 6.0 x 1023 platinum atoms?
boyakko [2]
Even though the numbers are in scientific notation, they are still just numbers. Essentially the question is as simple as "An apple weighs an ounce, how much do 35 apples weigh?". So all you have to do is multiply.

3.25 x 10^{-22}   x  6.0 x10^{23}  = 195

6 0
3 years ago
Two parts that make up a solution are... what
hjlf
Answer: All solutions have two parts: the solute and the solvent. The solute is the substance that dissolves, and the solvent is the substance that dissolves the solute.
Hope that helps (:
5 0
2 years ago
Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the expe
Anika [276]

Factors that increases reaction rate such as increase in concentration or pressure will reduce reaction time whereas factors that decrease reaction rate such as inhibitors will increase reaction time.

<h3>What are the factors that affect reaction rate?</h3>

Factors that affect reaction rate are those factors which increase or decrease the rate of chemical reaction.

The factors that affect reaction rate include:

  • temperature
  • concentration/pressure
  • catalysts
  • surface area
  • nature of substance

Any factor that increases reaction rate such as increase in concentration or pressure will reduce reaction time whereas factors that decrease reaction rate such as inhibitors will increase reaction time.

Learn more about factors affecting reaction rate at: brainly.com/question/14817541

#SPJ1

6 0
2 years ago
Net ionic equation for Barium chloride​
vaieri [72.5K]

Answer: There is one way to write it but i’ll also provide an unbalanced equation and a balanced one.

Explanation:

Unbalanced : Ba (aq) + Cl2 (aq)—-> BaCl (aq)

Balanced : 2Ba (aq) + Cl2 (aq)—> 2BaCl(aq)

3 0
2 years ago
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