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
Ksju [112]
3 years ago
11

Ughhh ughh ughhhhhelppp​

Chemistry
1 answer:
lions [1.4K]3 years ago
3 0

Answer:

Explanation:

one is True,   an electro magnet is only magnetic because of current producing the magnetic field.  

You might be interested in
Why do the carbon anodes need to be replaced regularly in the electrolysis of Al2O3 into aluminum metal?
Nuetrik [128]

Answer:

A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.

Explanation:

In the electrolysis of Aluminium, the oxygen reacts with the carbon anodes forming carbon dioxide. That is, the anodes are oxidized. To ensure that the reaction completes, the anode must gradually be replaced as the reaction proceeds. The correct option is hence;

A) They get oxidized into carbon monoxide and carbon dioxide by the oxygen molecules generated on the electrode.

8 0
3 years ago
Which process is a chemical change​
zimovet [89]

Answer: A process that is a chemical change is Chemical reactions involve combining different substances. They produces a new substances with new and different physical and chemical properties.

Explanation:

3 0
3 years ago
Read 2 more answers
Which choices are layers of the atmosphere?
slavikrds [6]

Answer:

Mesosphere

Stratosphere

Thermosphere

Troposphere

Exosphere

Explanation:

The exosphere refers to the farthest region of the atmosphere that gradually fades into space.

The troposphere is the lowest layer of atmosphere. It is the layer where weather changes occur.

The thermosphere is right above the mesosphere but just below the exosphere. It is the layer where photoionization/photodissociation of molecules occurs thereby creating ions. This largely owes to interaction of molecules in this layer with ultraviolet radiation.

The stratosphere is composed of gases. Prominent among them is ozone which serves as a blanket against the sun's ionizing radiation.

The mesosphere lies above the stratosphere but just below the thermosphere. Temperature decreases steadily with height in the mesosphere.

8 0
3 years ago
The decomposition of HBr(g) into elemental species is found to have a rate constant of 4.2 ×10−3atm s−1. If 2.00 atm of HBr are
Dennis_Churaev [7]

Answer:

7,94 minutes

Explanation:

If the descomposition of HBr(gr) into elemental species have a rate constant, then this reaction belongs to a zero-order reaction kinetics, where the r<em>eaction rate does not depend on the concentration of the reactants. </em>

For the zero-order reactions, concentration-time equation can be written as follows:

                                          [A] = - Kt + [Ao]

where:

  • [A]: concentration of the reactant A at the <em>t </em>time,
  • [A]o: initial concentration of the reactant A,
  • K: rate constant,
  • t: elapsed time of the reaction

<u>To solve the problem, we just replace our data in the concentration-time equation, and we clear the value of t.</u>

Data:

K = 4.2 ×10−3atm/s,  

[A]o=[HBr]o= 2 atm,  

[A]=[HBr]=0 atm (all HBr(g) is gone)

<em>We clear the incognita :</em>

[A] = - Kt + [Ao]............. Kt =  [Ao] - [A]

                                        t  = ([Ao] - [A])/K

<em>We replace the numerical values:</em>

t = (2 atm - 0 atm)/4.2 ×10−3atm/s = 476,19 s = 7,94 minutes

So, we need 7,94 minutes to achieve complete conversion into elements ([HBr]=0).

6 0
3 years ago
20 pts. I am making holiday cookies and the recipe says that it will make 48 cookies. After eating some raw cookie dough I bake
Nikitich [7]
Check the attached file for the answer.

5 0
3 years ago
Other questions:
  • Tell how many significant figures this number contains. 0.00000006
    13·2 answers
  • Solid sodium bromide decomposes into bromine gas and solid sodium . write a balanced chemical equation for this reaction.
    12·1 answer
  • Burning wood represents a chemical change.<br> True or False?
    8·2 answers
  • I will give you 50 pts
    5·2 answers
  • Oxygen (O) is a gas found in the 16th column of the periodic table. What statement is true about oxygen and the other elements i
    15·1 answer
  • 0.25 mol of CO and 0.45 mol of NO2 are mixed in a 25 L reaction vessel at 350°C. Calculate the molarities of all compounds prese
    5·1 answer
  • Find the mass of an object with a density of 2.01g/mL and a volume of 3.77mL
    7·1 answer
  • Which statement best describes a physical change?
    9·1 answer
  • PLEASEE HELPPP<br> what is the ph of 1.0 times 10^-2 M HBr
    9·1 answer
  • Which energy source from a reservoir would provide affordable, abundant electricity for a factory? solar panels wind turbines ga
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!