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
In the typical cell cycle, DNA synthesis occurs in the _________ phase.
kumpel [21]
Interphase ???????????????????
4 0
4 years ago
Read 2 more answers
(21 points) Please help, need quick
tiny-mole [99]
Habitat: Coyotes are able to easily adapt to different habitats. They can be found living anywhere from the Sonoran Desert to large, populated cities.
Food: Coyotes will eat nearly anything. They hunt rabbits, rodents, frogs, fish, and even deer. they also eat insects, snakes, fruit, and grass.
Reproductive Process:  Reproduction<span> in the </span>coyote<span> is a very intricate </span>process<span>, as females are completely infertile for ten months out of the year, and males are sterile for eight. The </span>process<span> begins with several males vying for the attention of a single female.</span> In spring, females den and give birth to litters of three to twelve pups. Both parents feed and protect their young and their territory.
Human and Environmental Challenges: Coyotes face many challenges. They are often hunted by other larger animals. Humans also hunt them when they are interfering with their crops or livestock.
Migration pattern: <span>According to a study, coyotes migrated eastward via two main route: one that went through the northern United States, and one that went through the south. Oddly enough, the Northern and Southern coyotes seemed to meet midway</span>
5 0
3 years ago
13. The allele that results in the absence of a tail is autosomal recessive. From which parent do
PSYCHO15rus [73]

Answer:

a) both parents

Explanation:

autosomal recessive means that both copies of the "no tail" allele must be inherited in order to produce a dog with no tail, therefore the answer is both parents

5 0
3 years ago
In a forest ecosystem including rabbits, wolves, foxes, and plants, what are two possible reasons the rabbit population might de
Finger [1]
The rabbit population may decline if the plant life starts to die or there’s an increase in the fox or wolf population.
4 0
3 years ago
Read 2 more answers
What is biological evolution?
SpyIntel [72]
Biological evolution is the process through which the characteristics of organisms change over successive generations, by means of genetic variation and natural selection. hope that helps
7 0
3 years ago
Read 2 more answers
Other questions:
  • What is the definition of "nutrients"?
    8·1 answer
  • Amoebas are able to protect themselves from unfavorable conditions by forming a _____.
    15·2 answers
  • Please help with biology!
    11·1 answer
  • How do index fossils help scientists?
    7·2 answers
  • Someone please help me
    14·1 answer
  • Organs are comprised of tissues that work together to perform a specific bodily function.
    10·2 answers
  • Which is not a characteristic of the spiders?
    8·1 answer
  • How do decomposers convert energy for an ecosystem
    12·1 answer
  • If an invasive species emigrated from a continent to a small island near the continent, what would most likely occur on the isla
    14·1 answer
  • Eukaryotes that reproduce through reproduction require two cells to contribute genetic material for the production of the next g
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!