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-BARSIC- [3]
3 years ago
11

Selma hypothesizes that the mass of a sample of water will not change if it is frozen. She conducts an experiment to test her hy

pothesis. Her experimental steps are as follows:
1. Fill a beaker with 500 mL of water.
2.
3. Place the beaker in the freezer.
4. After the water freezes, place the beaker on the balance and measure its mass.

Which of the following steps is missing from Selma's experiment?

Place the beaker on the balance and measure its mass.
Run the water through a filter to make sure there are no impurities in it.
Set a timer for 2 hours.
Use a thermometer to measure the water's temperature.
Mathematics
2 answers:
egoroff_w [7]3 years ago
4 0
Place a beaker on a balance and measure the mass
Sphinxa [80]3 years ago
4 0

Answer:

place the beaker on the balance and measure its mass.

Step-by-step explanation:

In order to see if the mass of the water changed, Selma first needs to find out what the mass of the liquid water is in order to compare it to the mass of the frozen water.

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7^5 = 7 × 7 × 7 × 7 × 7 = <span>16807
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ira [324]

Answer:

1) Subtracting one from the other

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Step-by-step explanation:

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\frac{2x+1}{2y}=7\\\\

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To solve these equations by the Elimination method we multiply equation 1 with 6 and multiply equation 2 with 2 so now,

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Now subtracting equation 2 from equation 1

12x+6=84y\\\\12x-2=20y\\\\Subtracting\ leads\ to\\12x-12x+6-(-2)=84y-20y\\0+8=64y\\8=64y\\8/64=y\\0.125=y

now insert this value of y into any equation

lets insert it into equation 1

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