CHEMISTRY MIDDLE SCHOOL

A meter is an SI unit. Which quantity might you measure in meters?A. temperature

B. mass

C. length

D. electric current

Answers

Answer 1
Answer:

Length a physical quantity will be measured in meters, therefore option (c) is correct.

What do you mean by physical quantity ?

A physical quantity can be defined as the characteristic property of a system that is generally quantified in terms of measurement.

Length , a physical quantity -

The physical quantity associated with length can be written as x meter, where x is the numerical value, and the meter specifies the unit .

Meter is represented by m. It is the fundamental unit of length.

Initially, One meter was defined as a quantity that is 1650763.73 times the wavelength of the light emitted in a vacuum .

Length a physical quantity will be measured in meters ,hence option (c) is correct.

Learn more about physical quantity ,here:

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Answer 2
Answer: The correct answer would be C.) Length

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What is a group of organisms that look alike and can reproduce among their selfs ?

Answers

The group you are asking about is called a species.
an example of this kind of species is called bacteria. they reproduce amongst themselves, and usually look alike. i hope this helped.

Can someone help me pls! Ack I accidently put chemistry. This is math LoL

Answers

87.5% (126/144) 126 is from subtracting 144 and 18

Which describes the polarity in a water molecule?

Answers

Answer:

The oxygen atom in a water molecule is strongly electronegative. The atoms of the water molecule are held together by covalent bonds. water has nonpolar bonds, but it has a bent shape and is therefore polar.

Which part of an object's rate of change best defines acceleration?velocity


force


speed


position

Answers

Answer:

Velocity

Explanation:

The change of velocity rate it's the definition of acceleration.

While increasing or decreasing velocity, it means that an acceleration it's happening.

Using some math:

a=(dv)/(dt)

This can be read as "the acceleration it's equal to te variation of velocity with respect to time"

What does the number next to isotopes signify?

Answers

The number next to isotopes signifies the sum of the number of protons plus the number of neutrons in the nucleus of an atom. An isotope is a version of an atom that has the same number of protons but different numbers of neutrons. Isotopes are very important in nuclear chemistry. A proton is a is a particle in the nucleus of an atom that has a positive charge. A neutron is also a particle in the nucleus of an atom, but it does not have an electric charge.

Which methods will help you properly identify pH with indicator paper? Check all that apply. Set a piece of pH paper in front of each solution before testing to keep organized. Dip the pH paper into each test tube and lay it on the table to let it change color. Use a transfer pipet to remove a few drops from the solution to drop onto the paper. Wait a minute or so before reading color. Use the same piece of indicator paper for each solution to conserve paper.

Answers

To identify pH with indicator paper,Set a piece of pH paper in front of each solution before testing to keep organized then, Use a transfer pipet to remove a few drops from the solution to drop onto the paper, Lastly Wait a minute or so before reading color.

What is a pH?

  • The pH is a measure of how acidic/basic a solution bythe amount of free hydrogen and hydroxyl ions in the water.
  • The range goes from 0 - 14, A point on  7 is neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates alkalinity.

A pH paper usually called litmus paper is used to determine if  the acidity, basicity or neutrality of a solution. This is determined by the following process:

  • Set a piece of pH paper in front of each solution before testing to keep organized.
  • Use a transfer pipet to remove a few drops from the solution to drop onto the paper.
  • Wait a minute or so before reading color.

Now if the paper turns red, the pH may likely be below 7 to show acidity

if the paper turns blue the pH may likely be above  7 to show basicity/alkalinity.

if the paper turns green , the pH is 7 to show neutrality.

See here for similar answer on  pH with indicator paperbrainly.com/question/15639358

Answer:

A) Set a piece of pH paper in front of each solution before testing to keep organized.

C) Use a transfer pipet to remove a few drops from the solution to drop onto the paper.

D) Wait a minute or so before reading color.
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