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
coldgirl [10]
3 years ago
10

When a cracker or bread dissolves in your mouth, is that a physical or chemical change?

Physics
2 answers:
BabaBlast [244]3 years ago
8 0
Physical because ur making dissolve
Anettt [7]3 years ago
3 0

Answer:

<u>Chemical change.</u>

Explanation:

The saliva or salivary amylase is a bio-catalyst...it causes chemical change during the dissolving process. Also, once the food is dissolved it can't be brought back to it's original state.

You might be interested in
In what part of the earth does convection occur?
n200080 [17]
The Asthenosphere is where the convection currents in the Earth occor
8 0
3 years ago
Practical steam engines utilize 450ºC steam, which is later exhausted at 270ºC.
Naily [24]

(a) 0.249 (24.9 %)

The maximum efficiency of a heat engine is given by

\eta = 1-\frac{T_C}{T_H}

where

Tc is the low-temperature reservoir

Th is the high-temperature reservoir

For the engine in this problem,

T_C = 270^{\circ}C+273=543 K

T_H = 450^{\circ}C+273=723 K

Therefore the maximum efficiency is

\eta = 1-\frac{T_C}{T_H}=1-\frac{543}{723}=0.249

(b-c) 0.221 (22.1 %)

The second steam engine operates using the exhaust of the first. So we have:

T_H = 270^{\circ}C+273=543 K is the high-temperature reservoir

T_C = 150^{\circ}C+273=423 K is the low-temperature reservoir

If we apply again the formula of the efficiency

\eta = 1-\frac{T_C}{T_H}

The maximum efficiency of the second engine is

\eta = 1-\frac{T_C}{T_H}=1-\frac{423}{543}=0.221

8 0
3 years ago
Which are most likely to be used during a routine visit to the dentist?
Paraphin [41]

Answer:

The most likely items to be used are;

Ultrasound and X-rays

Explanation:

A routine visit to a dentist consists of two areas of activities, including;

a) Dental examination and check up

b) Oral prophylaxis, and dental cleaning

The dental examination may involve the use of X-rays, which allow the detection of cavities between the teeth

The dental cleaning can be carried out with the use of an ultrasound cleaner, which allow the cleaning of sensitive teeth without hurting the patient

Therefore, the items most likely to be used during a routine dental visit are ultrasound and X-rays

8 0
3 years ago
Read 2 more answers
Hinge Joints-These jointscan only move in one direction, like a door hinge. One bone works against another. Movement is back and
prisoha [69]
Hinge joints would be your elbow, your knee and, believe it or not, your ankle as well!
6 0
3 years ago
A glass of juice at 20°C was kept in the open. After 30 minutes, the temperature of the Juice remained the same. Which statement
devlian [24]

The answer would be B the temperature of the juice was the temperature of the surrounding air

7 0
3 years ago
Read 2 more answers
Other questions:
  • Unlike a theory, a scientific law describes an observed pattern without attempting to _____ it. prove explain test verify
    15·1 answer
  • Plane microwaves are incident on a thin metal sheet that has a long, narrow slit of width 4.8 cm in it. The microwave radiation
    11·1 answer
  • Copper has a specific heat of 0.385 j. A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 Ce
    14·1 answer
  • A motorcycle is traveling with a velocity of 4 m/s and has a mass of 112 kg
    5·1 answer
  • In most cases, how many electrons does it take to completely fill the
    10·1 answer
  • what dangers higher voltages have for humans whose resistance changes depending on hand lotion, rubber gloves, other types of gl
    5·1 answer
  • The radius of the aorta in a test subject determined by MRI is 1.2 cm. At rest, his end diastolic volume is 120 mL and his end s
    7·1 answer
  • Would the following reaction be endothermic or exothermic? Why?
    15·1 answer
  • How can you return a negatively or positively charged object back to its neutral state?
    7·1 answer
  • A straight, cylindrical wire lying along the x axis has a length L and a diameter d . It is made of a material described by Ohm'
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!