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
MakcuM [25]
3 years ago
13

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be consid

ered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.
Physics
1 answer:
Inga [223]3 years ago
6 0
The answer is B.

A cannot be the answer is melting is a physical change. No chemical reaction took place.

B is the answer as it is a EXOTHERMIC REACTION so heat will be given off.

C cannot be the answer as dissolving is basically atoms becoming ions, not a chemical reaction whereby a reactant reacts with another reactant to form a product.

D cannot be the answer. Same reason as for why A is not the answer.

Cheers.
You might be interested in
A 4 kg mass is in free fall. What is the velocity of the mass after 11 seconds
Ksju [112]
Velocity of the mass after 11 seconds = ( value of the gravitational acceleration) * ( time )
velocity = ( 9.81 m / s^2 ) ( 11)
velocity = 107.91 meters per second
5 0
3 years ago
Climates on Earth get _____ as you move from the equator to the poles.
andreev551 [17]
The correct answer that would best complete the given statement above would be the last option: COLDER. Climates on Earth get colder <span>as you move from the equator to the poles. The places that are located near or on the equator experience the warmest or the hottest climates such as Africa. Hope this answer helps. </span>
5 0
3 years ago
Read 2 more answers
The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this
svlad2 [7]

Answer: They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

Explanation: On Edgenuity!!

7 0
3 years ago
Density=2g/mL and volume=20mL what is mass
leva [86]

Answer:

40g

Explanation:

Mass = density x volume

= 2 x 20

= 40g

8 0
3 years ago
Read 2 more answers
What is the magnitude of the orbital velocity of the earth in m/s?
Lana71 [14]
Circumference C=2πr 
<span>C=2π(1.5x10^8)=9.42x10^8 </span>

<span>In 365 Days there are 8760hr </span>

<span>V=distance/time </span>

<span>V=(9.42x10^8)/8760=107534.2km/hr </span>
8 0
3 years ago
Other questions:
  • A .5 kg air puck moves to the right at 3 m/s, colliding with a 1.5kg air puck that is moving to the left at 1.5 m/s.
    13·1 answer
  • A rock with a mass of 25 kg has a weight of 40.8 n on the moon. what is the value of the acceleration of gravity (g) on the moon
    14·1 answer
  • Orchids are a family of thousands of types of flowers that all share the same shape. Many gardening clubs are devoted to collect
    11·2 answers
  • Part 1: A rope has one end tied to a vertical support. You hold the other end so that the rope is horizontal. If you move the en
    13·1 answer
  • Jessica took a mylar balloon outside on a very cold day. As she waited for the bus the balloon began to shrink. What is the best
    7·1 answer
  • What are the different types of Energy transformations and Energy Transfers?
    10·1 answer
  • How does the eye and brain work together to give you perception of color
    14·1 answer
  • You only need to burn 20% of the calories you consume daily<br><br><br>true or false​
    6·1 answer
  • A temperature of 20°C is equivalent to approximately
    9·2 answers
  • Explain the relationship between air resistance and gravitational acceleration on a falling object
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!