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Ilya [14]
3 years ago
5

Is uranium a mixture or pure substance

Chemistry
2 answers:
ludmilkaskok [199]3 years ago
8 0
Pure substance is the answer I think !!!!
UNO [17]3 years ago
7 0

Answer: is a pure substance

Explanation:

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How do the circulatory and the excretory systems work together to maintain the human body on a daily basis?
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The circulatory system picks up nitrogenous wastes from the cells and delivers them to the kidneys. The kidneys remove these wastes from the blood and concentrates them into the urine that is eliminated from the body.
4 0
3 years ago
Sodium peroxide (Na2O2) is often used in self-contained breathing devices, such as those used in fire emergencies, because it re
Anastaziya [24]

Answer:

725.15 L

Explanation:

The balanced chemical equation for the reaction between Na₂O₂ and CO₂ is the following:

Na₂O₂ + CO₂ → Na₂CO₃ + 1/2 O₂

From the stoichiometry of the reaction, 1 mol of Na₂O₂ reacts with 1 mol CO₂. So, the stoichiometric ratio is 1 mol Na₂O₂/1 CO₂.

Now, we convert the mass of reactants to moles by using the molecular weight (Mw) of each compound:

Mw (Na₂O₂) = (23 g/mol x 2) + (16 g/mol x 2) = 78 g/mol

moles Na₂O₂ = 96.7 g/(78 g/mol) = 1.24 mol Na₂O₂

Mw (CO₂) = 12 g/mol + (16 g/mol x 2) = 44 g/mol

moles CO₂ = 0.0755 g/(44 g/mol) = 1.71 x 10⁻³ mol CO₂

Now, we calculate the number of moles of CO₂ we need to completely react with the mass of Na₂O₂ we have:

1.24 mol Na₂O₂ x 1 mol CO₂/1 mol Na₂O₂ = 1.24 mol CO₂

In 1 L of respired air we have 1.71 x 10⁻³ mol CO₂ (0.0755 g), so we need the following number of liters to have 1.24 mol of CO₂:

1.24 mol CO₂ x 1 L/1.71 x 10⁻³ mol CO₂ = 725.15 L

4 0
3 years ago
Compared to carbon dioxide, oxygen has a relatively _____ solubility coefficient and so requires a _____ partial pressure gradie
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Oxygen has a relatively <em><u>low </u></em>solubility coefficient and therefore requires a <em><u>steep </u></em>(high) partial pressure gradient to help diffuse the gas into the blood.

Solubility is described as the limiting amount of an element that can dissolve in any amount of solvent at a set temperature. Since oxygen has a low coefficient of this, it requires the help of a higher partial pressure gradient to diffuse properly into the bloodstream.

To learn more visit:

brainly.com/question/13620168?referrer=searchResults

5 0
3 years ago
Which of these is NOT a reason that scientists do experiments?
deff fn [24]
Design a new procedure
5 0
3 years ago
Read 2 more answers
Which of the following equations are balanced?
Law Incorporation [45]
A: 2H₂ + O₂ → 2H₂O

    H: 4            H:4
    O: 2           O: 2

The equation is balanced.

B. 2S + 3O₂ → 2SO₃

     S: 2             S: 2
     O: 6            O: 6

The equation is balanced.

C. Li + Cl₂ → LiCl

     Li: 1          Li: 1
    Cl: 2          Cl: 1

The equation is not balanced.

    2Li + Cl₂ → 2LiCl

    Li: 2            Li: 2
    Cl: 2           Cl: 2

D: 2K + 2H₂O → H₂ + 2KOH

    K: 2                 K: 2
    H: 4                 H: 4
    O: 2                 O: 2

The equation is balanced.

E: 2Fe + Cu(NO₃)₂ → 2Cu + Fe(NO₃)₂

    Fe: 2                       Fe: 1
    Cu: 1                      Cu: 2
      N: 2                        N: 2
      O: 6                        O: 6

The equation is not balanced.

2Fe + 2Cu(NO₃)₂ → 2Cu + 2Fe(NO₃)₂

Fe: 2                        Fe: 2
Cu: 2                       Cu: 2
  N: 4                         N: 4
  O: 12                       O: 12

The following equations that are balanced are A, B, and D.
6 0
3 years ago
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