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Mamont248 [21]
2 years ago
15

A biology class wants to perform an experiment to investigate the effect of different colors of light of green, yellow, red and

clear cellophane and plant three seeds in each one. What part do the three seeds experiment?
a. Confounding variables
b.independent variables
c. Control variables
d. Dependent variables
Chemistry
1 answer:
olga2289 [7]2 years ago
5 0

Answer:

controlled variables

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The closer you get to the equator the warmest you will be. 10 degrees north is warmer than 80 degrees north, because 10 degrees north is closer to the equator. I don't know if that was helpful or not but, I tried to answer as best as I could.
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What is the molarity when water is added to 4 moles of sodium chloride to make 0.5 liter of solution?
loris [4]
       If    0.5 L of solution contains 4 mol
then let     1 L of solution contain  x  mol
      
       ⇒    (0.5 L) x  = (4 mol) (1 L)

                         x  = (4 mol · L)  ÷  (0.5 L)

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Thus the molarity of the Sodium Chloride solution is 8 mol / L   OR  8 mol/dm³. 
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3 years ago
Specific Heat Practice
Alexxx [7]

Answer:

See below

Explanation:

<u>Specific Heat of water</u> =  4.186 J/(g-C)

J/(g-C)     multiplied  by  g   and C   results in J

4.186  * 540  * (95-32) = <u>142 407 .72 J</u>

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Explain how original mass of dry ice compares with the mass of carbon dioxide gas?
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8 0
3 years ago
How will you recognize that a single replacement reaction has occured when you combine an active metal with 6m hcl?
frez [133]

A single replacement or displacement reaction occurs when one ingredient in a compound replaces another. Only another metal can replace a less active one; a metal can only displace another metal, and a non-metal can only displace another non-metal.

<h3>Displacement reaction:</h3>

The tendency of the element to lose electrons is what makes it metallic. Due to their bigger sizes and propensity to lose electrons as size, the number of shells, and nuclear force of attraction rise, the most active metals are found on the left side of the periodic table.

The reaction in which the more reactive element displaces the less reactive element is known as the displacement reaction.

When we combine an active metal with HCl, the reaction is as follows:

We are taking sodium, Na which is the most active metal. It will replace H in HCl because it is more reactive than H.

                       2Na + 2HCl → 2NaCl + H₂

Three ways to recognize if a single displacement reaction has taken place:

1. Color change

2. Formation of bubbles (a gas)

3. Formation of a precipitate

Learn more about displacement reaction here:

brainly.com/question/15343606

#SPJ4

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