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Gennadij [26K]
1 year ago
15

In a laboratory, Nakisha mixes a sodium hydroxide solution with an indicator called phenolphthalein. When combined, they create

a pink solution. Nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. How could Nakisha use the scientific inquiry process to determine whether mixing other solutions with phenolphthalein will also create a pink color? Check all that apply. by making qualitative observations about the sodium hydroxide and phenolphthalein in solution by asking a classmate if sodium hydroxide turns pink when mixed with other solutions by comparing the given solution to other familiar solutions containing phenolphthalein by designing an experiment to test phenolphthalein with other solutions by repeating the experiment at different temperatures
Physics
2 answers:
Gnesinka [82]1 year ago
8 0

by making qualitative observations about the sodium hydroxide and phenolphthalein in solution

by comparing the given solution to other familiar solutions containing phenolphthalein

by designing an experiment to test phenolphthalein with other solutions

Lapatulllka [165]1 year ago
8 0

Answer:

1. by making qualitative observations about the sodium hydroxide and phenolphthalein in solution

3. by comparing the given solution to other familiar solutions containing phenolphthalein

4. by designing an experiment to test phenolphthalein with other solutions

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Answer:

The answer is "between 20 s and 30 s".

Explanation:

Calculating the value of positive displacement:

\ (x_{+ve}) = \frac{1}{2} \times 15 \times  20 \\\\

          = \frac{1}{2} \times 300 \\\\=  150 \\\\

Calculating the value of negative displacement upon the time t:

(x_{-ve}) = \frac{1}{2} \times 5 \times 20- 20(t-20) \\\\

          = \frac{1}{2} \times 100- 20t+ 400 \\\\= 50- 20t+ 400 \\\\

\to X= X_{+ve} + X_{-ve} \\\\

\to  150 - 50 -20t+400 =0\\\\\to 100 -20t+400 =0 \\\\\to 500 -20t =0\\\\\to 20t =500 \\\\\to t=\frac{500}{20}\\\\\to t=\frac{50}{2}\\\\\to t= 25

That's why its value lie in "between 20 s and 30 s".

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2 years ago
When driving in heavy rain, or on a flooded road, your tires can ride on a thin film of water like skis;
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Angelina jumps off a stool. As she is falling, the Earth’s gravitational force on her is larger in magnitude than the gravitatio
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The graph represents the heating of water in a pot. At 150 seconds, the water has just reached a boil. If the heat is left on, w
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2 years ago
A bicyclist travels the first 800 m of a trip 1.4 minutes, the next 500 m in 1.6 minutes, and finishes up the final 1200 m in 2
soldier1979 [14.2K]

Answer:

 v_average = 500 m / min

Explanation:

Average speed is defined

         v = (x_{f} -x₀) / Δt

let's look in each section

section 1

the variation of the distance is 800 in a time of 1.4 min

         v₁ = 800 / 1.4

         v₁ = 571.4 m / min

section 2

distance interval 500 in a 1.6 min time interval

         v₂ = 500 / 1.6

         v₂ = 312.5 m / min

section 3

distance interval 1200 m in a time 2 min

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         v₃ = 600 m / min

taking the speed of each section we can calculate the average speed

         

the distance traveled

        Δx = 800 + 500 + 1200

        Δx = 2500 m

the time spent

        Δt = 1.4 + 1.6+ 2

        Δt = 5 min

         v_average = Δx / Δt

         v_average = 2500/5

         v_average = 500 m / min

7 0
2 years ago
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