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
TEA [102]
3 years ago
10

2) ¿Cuál de los siguientes hechos no es una evidencia de una reacción química? a) Presencia de un catalizador b) Cambio de color

d) Liberación de gas​
Biology
1 answer:
Pepsi [2]3 years ago
3 0

Answer:

a) Presencia de un catalizador

Explanation:

Los dos tipos de cambios que experimentan las sustancias en la química son cambios químicos y físicos.

Un cambio físico es un cambio es un cambio en el que la sustancia cambia en su apariencia o su forma de una manera que es reversible y en la que no se forma una nueva sustancia.

Un cambio químico es aquel en el que hay un cambio en las sustancias presentes y se forma una nueva sustancia.

La evidencia de que ha tenido lugar un cambio químico incluye

1) La formación de un precipitado a partir de la mezcla de sustancias.

2) Un cambio en el color de las sustancias.

3) Un cambio en el olfato (que desprende un olor) o en el sabor.

4) La sustancia produce luz (brilla)

5) El volumen total cambia

6) Cambio de temperatura (la mezcla se calienta o enfría)

Por lo tanto, la presencia de un catalizador, que es una sustancia que no participa en una reacción pero aumenta la velocidad de reacción, no es evidencia de una reacción química.

You might be interested in
Saved
belka [17]
This is newton’s third law of motion
5 0
3 years ago
Read 2 more answers
why do the three species have similarities and differences in their body structures, and how can Xiao use the structures to dete
Luba_88 [7]

Answer:

Xiao can use these structures to create a similarity matrix that enables to differentiate between synapomorphies and homoplasies .

Explanation:

A synapomorphy is a trait that has been inherited from the same ancestor, this trait enables to establish a relation of homology between two or more species; while a homoplasy is an analog structure that doesn't have homology.

3 0
3 years ago
Early land animals had gills as well as lungs. Please select the best answer from the choices provided T F
natka813 [3]
The answer is False.

Although, there are some evidence that suggests that species from million years ago possessed both gills and lungs. For example is the Acanthostega Gunnari, one of the oldest species discovered with four limbs. The creature is a salamander-like creature found in Greenland hundreds of million years ago. Although the specie can walk on land but the finding characterized the creature primarily as a fish.
6 0
3 years ago
Read 2 more answers
What happens if the correct ligand binds to ligand-gated sodium channel in a post-synaptic neuron?
Maru [420]

Answer:

Post-synaptic neurons after receiving correct ligands called as neurotransmitter in correct amount generates action potential. This action potential may be inhibitory or accelatory.

Explanation:

Postsynaptic neuron :

These are the neurons that is present after the gap called synapse. These neurons after receiving correct ligands called as neurotransmitter in correct amount generates action potential. This action potential may be inhibitory or accelatory.

There are number of neurotransmitter. These includes

GABA ergic: This neurotransmitter is often inhibitory.

glutamatergic: This neurotransmitter is often excitatory.

Adrenergic: This neurotransmitter releases norepinephrine.

Cholinergic: This neurotransmitter activates vertebrate neuromuscular junction.

6 0
3 years ago
Which chemical formula reflects the diagram?
alukav5142 [94]

Answer:

BTW WHERE IS THE DIAGRAM

HAVE A NICE DAY

5 0
3 years ago
Other questions:
  • The monomers of DNA are composed of?
    9·2 answers
  • A mutagen is
    11·2 answers
  • Interphase occupies approximately _____ of the cell cycle.
    12·1 answer
  • What is the meaning of speed?
    13·2 answers
  • What are the benefits of cell division in somatic cells?
    13·1 answer
  • Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additia
    5·2 answers
  • Why is cellular respiration important o humans
    10·1 answer
  • How does the resistance of a light bulb filament change after the light has been turned on? Number 5
    5·1 answer
  • Muscular tissue has several important properties, such as electrical excitability. Another property of muscular tissue is that i
    11·1 answer
  • Each statement explains a cause that would prevent a plant not to bear seed in its life cycle except:
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!