1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Wittaler [7]
3 years ago
9

Researchers are investigating processes that happen during digestion. Which answer choice describes only a physical change durin

g digestion?

Chemistry
1 answer:
ElenaW [278]3 years ago
8 0

The correct answer is B. Chewing in the mouth breaks food into small pieces.

Explanation:

In physical changes, substances do not change their chemical composition or properties but only physical features such as this. This occurs during the chewing because the action of chewing only makes food to be broken down in smaller pieces but does not change its identity, composition, or properties. This does not occur once the food is in contact with saliva, the acid in the stomach, etc. because in these cases, the food reacts with other substances and a chemical reaction occurs, which changes food's identity and composition.

You might be interested in
Plz help I’m pretty confused on this question
sergeinik [125]

Answer:

Bohr model A

Explanation:

It has more valance electrons therefore has more interaction between the atoms and has more electronegativity.

7 0
2 years ago
The reducing agent in the reaction described in Fe + 2HCl → FeCl2 + H2 is A. H2. B. Fe. C. HCl. D. FeCl2.
Fed [463]
The reducing agent is b). Fe
7 0
3 years ago
Read 2 more answers
In the nucleus, there are 36 protons and 36 neutrons
antoniya [11.8K]
And??????????????????
3 0
2 years ago
What is the identity of the element, and how many neutrons does it have? An elements most stable ion forms an ionic compound wit
Pani-rosa [81]

Answer:

B. CA, 14

Explanation:

Atoms of elements contain small particles known as electrons, neutrons, and protons. The nucleus of an atom is made up of neutrons and protons which are at the center of the atom. Electrons on the other hand surrounds the nucleus. Electron has negative charge while proton has a positive charge. The number of neutrons is equivalent to the number of protons . In addition, the number of protons is equal to mass number minus the number of electrons.

For the compound XCl_{2}, it can be broken down into X^{2+} and 2Cl^{-}. Its ion has a mass of 34 and 18 electrons which means it has already lost 2 electrons.

Therefore:

For the given element, the number of electrons is 18+2 = 20 electrons.

The number of protons = 34 - 20 = 14.

And the number of neutrons is 14.

Only option B has the correct answer.

6 0
3 years ago
Someone has left a shiny metal bowl outside in the sun. Which may have the potential to damage your eyes: looking at the outside
STatiana [176]

Answer:

Looking at the inside of the bowl

Explanation:

The curvature of the bowl would likely focus the light to a single point or area above it. This higher intensity area would be more dangerous to look at.

3 0
3 years ago
Read 2 more answers
Other questions:
  • When a substance is oxidized it is called a(n): select one:
    7·1 answer
  • Define matter as a science topic<br>​
    7·2 answers
  • In general, as activation energy increases, reaction rate ________. goes down if the reaction is exothermic goes down if the rea
    9·1 answer
  • Is berkelium flammable
    14·2 answers
  • All animals need oxygen gas (O2) for their primary cellular-level functioning. Inside the cell, O2 is split apart into oxygen at
    7·1 answer
  • A gas occupies 65 mL at a temperature of 92.4 °C. What is the volume at 87.6 °C?
    8·1 answer
  • Name the following ester molecule:
    9·1 answer
  • Alkaline solutions have pH values below 7.<br><br>true or false ?<br>​
    12·1 answer
  • What happens when fats are oxidised?​
    14·2 answers
  • Why is the iron block the hardest to lift?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!