CHEMISTRY MIDDLE SCHOOL

What scientists do that is the basis for their investigations

Answers

Answer 1
Answer: The basis of any scientific investigation is a hypothesis and a research question. These guide your research and help you focus on an area that is narrow enough to study for meaningful results. The research question helps quantify how you are going to study the hypothesis.

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What is the color of the indicator thymol blue in a solution that has a pH of 11?(1) red (3) pink

(2) blue (4) yellow

Answers

Answer is (2) - blue.


Thymol blue is a pH indicator which 3 colors according to the pH.


Thymol blue shows red color at below pH than 1.2 and shows yellow color at the pH between 2.8 and 8.0. For the pH above 9.6, thymol blue shows blue color.


Hence, the thymol blue has 2 pH ranges as 1.2 - 2.8 and 8.0 - 9.6.


Since, pH = 11 is above the pH = 9.6, thymol blue shows blue color.
The answer would be blue. This is because red indicates 1-2, pink is 3, and yellow is 6.

Because the light rays never meet, a concave lens can produce

Answers

Answer:

Virtual images.

Hope this helps.

What would be an example of a land form from magma?A.Hot springs
B.Lava Plateau
C.Dome Mountains
D.Shield Mountains

Answers

An example of a land form from magma is B. Lava Plateau.

How much energy does a 9 x 10-8 m wavelength photon have?A. 5.96 x 10-41 j

B. 2.21 x 10-18 j

C. 7.36 x 10-27

D. 1.988 x 10-49 J

Answers

Answer:

B

Explanation:

From the given formukar for energy of a photon, we can obtain the energy of the photon as shown in the image. The meaning of the parameters in the equation are also shown in the image.

Answer: 2.21 x 10^-18 j

Explanation: a pex

Would a screwdriver be an example of technology? Why or why not?

Answers

Technology is anything made my man to make tasks easier. So yes, a screwdriver is technology.
No because they is no electricity going through it because it is a hand held device Hope this helps Have a great day Smile More

From which layer of the atmosphere do particles of air escape into space?

will give brainly

Answers

Answer: The layer from where particles of air escape into space is exosphere.

Explanation:

The atmosphere is divided into layers. There are 5 main layers of atmosphere, which are: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.

  1. Troposphere is the lowest layer of the atmosphere where most of the weather occurs.
  2. Then comes the Stratosphere which is about 50 km above the Earth's surface. It contains most of the ozone which is present in the atmosphere.
  3. Then comes the Mesosphere which starts from 50 km and extends upto 85 km from the Earth's surface.
  4. Then comes the Thermosphere which starts from 90 km and extends to between 500 km and 1,000 km.
  5. Exosphere is the last layer of the atmosphere, through which anything escapes the atmosphere to space. This layer extends upto 10,000 km from the Earth's surface.

Hence, the layer from where particles of air escape into space is exosphere.

Answer:

Exosphere

Explanation:

I took the k12 test.
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