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
scoray [572]
3 years ago
12

Digestion is the process of breaking down food into substances that the can use. Which of the following is a physical change tha

t takes place during digestion?
A- Bite helps break down fast
B- The teeth grind food into smaller pieces
C- Enzymes help break down carbohydrates
Chemistry
2 answers:
Yuri [45]3 years ago
8 0
C - Enzymes help break down carbohydrates.
ankoles [38]3 years ago
3 0

Answer:

B- The teeth grind food into smaller pieces

Explanation:

A physical change is a type of change in which the form of matter or substance is altered but not its chemical composition. The size or shape of matter may be changed, but no chemical reaction occurs. Physical changes are majorly a reversible process. The teeth grinding food into smaller pieces affects the size and shape not the chemical composition of the food.

You might be interested in
Hi! I need some solar system facts!
nikitadnepr [17]
The Solar System[b] is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.[c] Of the objects that orbit the Sun directly, the largest are the eight planets,[d] with the remainder being smaller objects, the dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly—the natural satellites—two are larger than the smallest planet, Mercury.[e]
5 0
3 years ago
Read 2 more answers
Which of the following describes a reference point?
Vitek1552 [10]

Answer:

A

Explanation:

i think the answer is A

5 0
3 years ago
What is the molar mass of an unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C?
soldier1979 [14.2K]

Answer:

Explanation:Explanation:

Your starting point here will be the ideal gas law equation

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

P

V

=

n

R

T

a

a

∣

∣

−−−−−−−−−−−−−−−

, where

P

- the pressure of the gas

V

- the volume it occupies

n

- the number of moles of gas

R

- the universal gas constant, usually given as

0.0821

atm

⋅

L

mol

⋅

K

T

- the absolute temperature of the gas

Now, you will have to manipulate this equation in order to find a relationship between the density of the gas,

ρ

, under those conditions for pressure and temperature, and its molar mass,

M

M

.

You know that the molar mass of a substance tells you the mass of exactly one mole of that substance. This means that for a given mass

m

of this gas, you can express its molar mass as the ratio between

m

and

n

, the number of moles it contains

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

M

M

=

m

n

a

a

∣

∣

−−−−−−−−−−−−−

(

1

)

Similarly, the density of the substance tells you the mass of exactly one unit of volume of that substance.

This means that for the mass

m

of this gas, you can express its density as the ratio between

m

and the volume it occupies

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

ρ

=

m

V

a

a

∣

∣

−−−−−−−−−−−

(

2

)

Plug equation

(

1

)

into the ideal gas law equation to get

P

V

=

m

M

M

⋅

R

T

Rearrange to get

P

V

⋅

M

M

=

m

⋅

R

T

P

⋅

M

M

=

m

V

⋅

R

T

M

M

=

m

V

⋅

R

T

P

Finally, use equation

(

2

)

to write

M

M

=

ρ

⋅

R

T

P

Convert the temperature of the gas from degrees Celsius to Kelvin then plug in your values to find

M

M

=

1.02

g

L

⋅

0.0821

atm

⋅

L

mol

⋅

K

⋅

(

273.15

+

37

)

K

0.990

atm

M

M

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

26.3 g mol

−

1

a

a

∣

∣

−−−−−−−−−−−−−−−−

I'll leave the answer rounded to three

7 0
3 years ago
Woodpeckers find insects to eat by pecking holes in trees with their beaks. One day, a woodpecker finds a particular tree that o
bixtya [17]

Answer:

1. Reflex Conditioning

Explanation:

Conditioning is an aspect of learning where a stimulus works effectively in producing a response from an organism. This response becomes regular given the type of reinforcement that is administered to the organism. The reinforcement is usually a reward that is given to the organism.

This is what is observed in the woodpecker.  The stimulus or reinforcement which proves effective in producing a continuous response  from the woodpecker is the abundant supply of the birds favorite bugs. This reinforcement makes it possible for the woodpecker to become conditioned towards returning to the tree.

4 0
3 years ago
Earth's atmosphere, which traps heat and radiation from the sun, helps to keep our temperature somewhat stable, even when we are
Elis [28]

Answer:

It is true

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • The frequency of sound wave determines what?
    12·1 answer
  • Scientists define work as the spending of energy.<br><br> True<br> False
    7·1 answer
  • How can a scientific law be expressed as a mathematical equation?
    8·2 answers
  • Which substance is completely consumed in a chemical reaction?
    8·1 answer
  • If I titrate an acid with 255mL of 3.4 M NaOH (base) and reach the equivalence point, how many moles of H+ ions were in the acid
    7·1 answer
  • As you have seen in this lab, the density of water is near 1 g/cm3. Anything with a density lower than this will float in water,
    9·2 answers
  • Hi question, what number should I change the 9 to so it's balanced?
    15·1 answer
  • 8. A wave has a frequency of 46 Hz and a wavelength of 2.1 meters. What is the speed of the wave?
    13·1 answer
  • An element with 3 valence electrons would be a
    9·1 answer
  • When the u-235 nucleus is struck with a neutron, the zn-72 and sm-160 nuclei are produced, along with some neutrons. How many ne
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!