PHYSICS HIGH SCHOOL

What are some indicators that a chemical reaction is occurring? Check all that apply. A: the formation of bubbles
B: a change in size
C: a change in color
D: the formation of a liquid
E: the formation of a precipitate

Answers

Answer 1
Answer:

The indicators that a chemical reaction is occurring include:

A: the formation of bubbles

C: a change in color

D: the formation of a liquid

E: the formation of a precipitate are all correct

Signs that show that chemical reaction is occurring

Formation of Bubbles (Gas Evolution): The production of gas bubbles can signify a chemical reaction. This often happens when reactants combine to release a gaseous product, such as in the reaction of an acid with a carbonate, producing carbon dioxide.

Change in Color: A noticeable change in color can indicate a chemical reaction. It suggests that the arrangement of atoms in the molecules has changed, leading to the absorption or emission of specific wavelengths of light.

Formation of a Precipitate: A precipitate is an insoluble solid formed when two solutions are mixed. It suggests that a chemical reaction has occurred because the reactants have combined to create an insoluble product.

The indicators that a chemical reaction is occurring include all the following

the formation of bubbles, a change in color, the formation of a liquid and the formation of a precipitate

These are common signs of a chemical reaction. A change in size can also be an indicator in some cases, especially if it accompanies the formation of a gas (bubbles).

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Answer 2
Answer: Hi there! When a chemical Reaction happens, the tell tale signs are as listed:
~The chemical produces bubbles
~ The Chemical emits an odor 
~ The liquid forms a solid(Precipitate) 
~ There is a change of color 
~ And last but not least a change in temperature! 

Hope this can help! Good luck! 

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Which phrase describes an atom?a positively charged electron cloud surrounding a positively charged nucleus
a positively charged electron cloud surrounding a negatively charged nucleus
a negatively charged electron cloud surrounding a positively charged nucleus
a negatively charged electron cloud surrounding a negatively charged nucleus

Answers

a negatively charged electron cloud surrounding a positively charged nucleus, the third one is the right answer.

Nucleus consists of electrically neutral neutrons and positively charged protons, so it is positively charged. Electrons, on the other hand are negatively charged. Electromagnetic force bounds atoms to the nucleus.

Final answer:

An atom is described as a negatively charged electron cloud surrounding a positively charged nucleus.

Explanation:

An atom is the basic unit of matter, consisting of a nucleus at its center, composed of protons and neutrons, and electrons orbiting the nucleus. It is the fundamental building block of elements, and the arrangement of electrons determines an atom's chemical properties.

An atom is described as a negatively charged electron cloud surrounding a positively charged nucleus. The nucleus of an atom contains positively charged protons and electrically neutral neutrons, while the negatively charged electrons exist in the electron cloud surrounding the nucleus. This model of the atom is known as the Bohr model, which accurately represents the distribution of electrons in an atom.

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List five factors that may affect the rate of a chemical reaction

Answers

1) temperature 
2) pressure
3) concentration
4) surface area
5) the presence of  a catalyst 

What is energy from the vibration and movement of the atoms and molecules within substances?a. nuclear energy
b. potential energy
c. radiant energy
d. thermal energy

Answers

The answer is D, thermal energy. 

Which statement is true about a polarized object?

Answers

The statement which is true about a polarized object would be "the number of the positive and negative charges can be the same." Polarized objects became polarized and it has its center of positive charges separated from negative charges. 

Answer:

For plato users: C.The number of positive and negative charges can be the same.

You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (if you run any faster, you’ll be caught for running). How much time will it take to get to your class?

Answers

200/1.5 = 133.33 seconds. 

= approximately 2 mins and 13 secs. 
Time = distance / velocity

= 200/1.5

= 133.3333 s.

Thus, the time will be around 133 seconds or 2 minutes 13 seconds.

My dog Callie can run at 21 mi/h. How far can he travel in 10 hours?

Answers

Answer: 210 miles

Explanation:

21 mi/1 hr

21 * 10 hrs

210 mi
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