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
Kryger [21]
2 years ago
12

Which of the following is a change in which the identity of the substance

Chemistry
1 answer:
sergey [27]2 years ago
3 0

Answer:

physical

Explanation:

physical is the answer not chemical

<u>I</u> <u>think</u><u> </u><u>so</u>

You might be interested in
An 85 kg construction worker has 37 485 J of gravitational potential energy. To the nearest whole number, the worker is___
Dmitry [639]

Answer:

44,1 m

Explanation:

Ep= m * g * h

37485 = 85 * 10 * h

h = 44,1 m

7 0
3 years ago
Which of these pairs of elements have the same number of valence electrons?
Taya2010 [7]
The same number of valence electrons exists in the same family of elements in the periodic table. In finding the answer to this problem, we just have to find the pair that belongs to the same family in the periodic table. The same family means same column. Among these, Oxygen and lead (Pb) are in the same family. This pair is the answer.
7 0
3 years ago
1. Calculate the average reaction rate expressed in moles H2 consumed per liter per second.
valentina_108 [34]

Answer:

1) 0.0025 mol/L.s.

2) 0.0025 mol/L.s.

Explanation:

  • For the reaction:

<em>H₂ + Cl₂ → 2HCl.</em>

<em></em>

<em>The average reaction rate = - Δ[H₂]/Δt = - Δ[Cl₂]/Δt = 1/2 Δ[HCl]/Δt</em>

<em></em>

<em>1. Calculate the average reaction rate expressed in moles H₂ consumed per liter per second.</em>

<em></em>

The average reaction rate expressed in moles H₂ consumed per liter per second = - Δ[H₂]/Δt = - (0.02 M - 0.03 M)/(4.0 s) = 0.0025 mol/L.s.

<em>2. Calculate the average reaction rate expressed in moles CI₂ consumed per liter per second.</em>

<em></em>

The average reaction rate expressed in moles Cl₂ consumed per liter per second = - Δ[Cl₂]/Δt = - (0.04 M - 0.05 M)/(4.0 s) = 0.0025 mol/L.s.

7 0
3 years ago
Why k has more shielding effect than Na?​
lara [203]

Explanation:

As the charge of all electrons are equal, the repulsive force exerted by each of them is also going to be equal. So, as K has more electrons repulsing its valence electron than Na, it has greater electron shielding.

8 0
3 years ago
How many moles (of molecules or formula units) are in each sample?
Alexus [3.1K]

The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles

<h3>What is the number of moles?</h3>

The number of moles of a substance is the ratio of the mass of the substance to the molar mass.

In other words; mole = mass/molar mass.

Thus:

  • moles of 18.0 g NO_2 = 18.0/46

                                   = 0.391 moles

  • moles of 1.35 kg CO_2 = 1350/44

                                         = 30.7 moles

  • moles of 46.1 g KNO_3 = 46.1/101.1

                                          = 0.456 moles

  • moles of 191.8 kg Na_2SO_4 = 191800/142

                                                 = 1350 moles

More on the number of moles of substances can be found here: brainly.com/question/1445383

#SPJ1

5 0
1 year ago
Other questions:
  • The solvent was propanone. Which of the three basic colours is most soluble in propanone?​
    7·1 answer
  • Explains WHY things behave the way they do - it is an explanation of a set of related observations or events based on a proven h
    7·1 answer
  • Which is a good example of a contact force? A. protons in the nucleus of an atom B. a ball falling down after it's thrown up int
    6·1 answer
  • If an atom has twelve electrons, how many electrons are in the n=1 energy level? How many electrons are in the n=2 energy level?
    5·1 answer
  • How many moles are there in 12.5 g of methanol, CH3OH?
    12·1 answer
  • Why do the aquatic plants not break down by water current?
    13·1 answer
  • What organism is responsible for the cycling of nitrogen?
    10·1 answer
  • 2. What are some common properties of metals, nonmetals, and semimetals?
    15·2 answers
  • can energy and matter be created during photosynthesis and cellular respiration pleasssseeee this is due today
    11·2 answers
  • Elabore el balance de la ecuación por oxido reducción enumerando cada paso
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!