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
lisov135 [29]
3 years ago
12

What element has the lowest melting point

Chemistry
1 answer:
kap26 [50]3 years ago
8 0
Helium (He) has the lowest melting point of <span>-272.2 °C.</span>
You might be interested in
Which structures does a single cell organism need for movement?
arsen [322]

Answer:

Actually, many single-celled organisms have a structure that facilitates mobility within the cell's environment. These often take the form of flagella, thin structures that emanate from the cell wall and push into the outer environment

Explanation:

4 0
3 years ago
True or false
Fittoniya [83]

Answer:1

Explanation: friction is showing us how in the past

7 0
2 years ago
What is the ideal gas constant?
sammy [17]
It is a universal constant used for all gases
7 0
3 years ago
The reaction 2NO(g)+O2(g)−→−2NO2(g) is second order in NO and first order in O2. When [NO]=0.040M, and [O2]=0.035M, the observed
Oksanka [162]

Answer:

(a) The rate of disappearance of O_{2} is: 4.65*10^{-5} M/s

(b) The value of rate constant is: 0.83036 M^{-2}s^{-1}

(c) The units of rate constant is:  M^{-2}s^{-1}

(d) The rate will increase by a factor of 3.24

Explanation:

The rate of a reaction can be expressed in terms of the concentrations of the reactants and products in accordance with the balanced equation.

For the given reaction:

2NO(g)+O_{2}->2NO_{2}

rate = -\frac{1}{2} \frac{d}{dt}[NO] = -\frac{d}{dt}[O_{2}] = \frac{1}{2}\frac{d}{dt}[NO_{2}] -----(1)

According to the question, the reaction is second order in NO and first order in  O_{2}.

Then we can say that, rate = k[NO]^{2}[O_{2}] -----(2)

where k is the rate constant.

The rate of disappearance of NO is given:

-\frac{d}{dt}[NO] = 9.3*10^{-5} M/s.

(a) From (1), we can get the rate of disappearance of O_{2}.

    Rate of disappearance of  O_{2} = -\frac{d}{dt}[O_{2}] = (0.5)*(9.3*10^{-5}) M/s = 4.65*10^{-5} M/s.

(b) The rate of the reaction can be obtained from (1).

    rate = -\frac{1}{2} \frac{d}{dt}[NO] = (0.5)*(9.3*10^{-5})

    rate = 4.65*10^{-5} M/s

   The value of rate constant can be obtained by using (2).

    rate constant = k = \frac{rate}{[NO]^{2}[O_{2}]}

    k = \frac{4.65*10^{-5}}{(0.040)^{2}(0.035)} = 0.83036 M^{-2}s^{-1}

(c) The units of the rate constant can be obtained from (2).

    k = \frac{rate}{[NO]^{2}[O_{2}]}

    Substituting the units of rate as M/s and concentrations as M, we get:

\frac{Ms^{-1} }{M^{3}} = M^{-2}s^{-1}

(d) The reaction is second order in NO. Rate is proportional to square of the concentration of NO.

     rate\alpha [NO]^{2}

If the concentration of NO increases by a factor of 1.8, the rate will increase by a factor of (1.8)^{2} = 3.24

     

5 0
3 years ago
Select the correct answer from each drop-down menu.
stealth61 [152]

Answer:

Light energy; chemical

Explanation:

The light energy of the Sun is converted into chemical energy by the plants.

5 0
3 years ago
Other questions:
  • Why might a dry atmosphere cause your crystal to fracture and to eventually become a
    12·1 answer
  • What explains why curry, a spice used in cooking, is this shade of orange? A. White light hits the spice, but only orange light
    7·1 answer
  • How to convert 35ml= dl
    7·1 answer
  • 1.
    7·1 answer
  • Which radioactive isotope is most useful for determining the age of mastodont bones found in late Pleistocene sediments?
    8·2 answers
  • The residue of coal decomposition that is used in the manufacture of steel is called
    7·1 answer
  • Dwayne has a green mineral. It most likely contains
    5·2 answers
  • Give the correct thermochemical equations for a (cacl2+h2o) pack and (nh4no3+h2o) pack.
    9·1 answer
  • If a compound contains an anion which is the conjugate base of a weak acid, the addition of hydronium ion solubility does what ?
    7·1 answer
  • Suppose that we combined 75 g of magnesium with 45 g of nitrogen and heat them up. Predict the product of
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!