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
EastWind [94]
3 years ago
7

Which sample is a pure substance?

Chemistry
1 answer:
marin [14]3 years ago
7 0

Answer:

A test tube of zinc oxide.

Explanation:

The zinc and oxygen are not at a set ratio, the flask of pond water contains a whole lot of stuff (mixture), and a jar of soil is a mixture.

You might be interested in
If after heating the reaction between magnesium and hydrochloric acid, the mass of the magnesium chloride and beaker is measured
Allushta [10]

Since the beaker was heated we can asume that only magnesium cloride is left in the beaker, therfore the difference between the beaker with magnesium chloride and the empty beaker give the mass of magnisium chloride:

\text{mass MgCl}_2=massbeakerwithMgCl_2-mass\text{ emprty beaker =37.83 g - 33.95g = 3.8}8g

7 0
1 year ago
Which of the following best shows two element combining to form a compound
marshall27 [118]

Answer:

there are no examples but 1 example is H2O which has 2 elements combining a compound.

Explanation:

6 0
3 years ago
Consider the following equilibrium reaction having gaseous reactants and products. 4HCl + O2 ⇌ 2H2O + Cl2 Which of the following
gulaghasi [49]
<h3><u>Answer</u>;</h3>

B.The rate of forward reaction increases.

<h3><u>Explanation;</u></h3>
  • Le Chatelier's principle states that changing a factor such as concentration, temperature, or pressure of a reaction at equilibrium will cause the reaction to shift in the direction that counteracts the effect of that change.
  • <em><u>Therefore, when reactants are added to a reaction at equilibrium shift when more reactants are added then the reaction shifts to the right to make more products.</u></em>
3 0
4 years ago
What method would you use to find the volume of an irregularly shaped object?
dimulka [17.4K]
Displacement, usually the method that is used to measure the volume of an irregularly shaped object.
4 0
4 years ago
A binding protein binds to a ligand l with a kd of 400 nm what is the concentration of ligand when y is 0.25
vampirchik [111]

Answer:

The answer is 7600 nm.

Explanation:

As, Y = 0.25 = [ L ÷ (400 + (L)]

0.95 x 400 + 0.25 [ L] = [ L ]

380.25  = [ L ] - 0.95 [ L ]

              = 0.05 [L]

[L] = 380 ÷ 0.05 = 7600nm

6 0
3 years ago
Other questions:
  • Polarity of water. Which is the correct answer?
    5·2 answers
  • How many mL of a 0.300 M AgNO3 solution will it take to make 500 mL of a 0.100 M AgNO3 solution?
    6·2 answers
  • What is the total pressure of a gaseous mixture that contains three gases with partial pressures of 0.845 atm, 120 torr and 210
    7·1 answer
  • The combustion of a sample of butane, C4H10, produced 2.46 grams of water.
    10·1 answer
  • The mass number of Fez is 56. How many neutrons are there in a single Fez atom?
    6·1 answer
  • How are elements symbols represented on the periodic table
    6·1 answer
  • What is true of a sample of gas as temperature is increased?
    15·2 answers
  • What happens in a double-replacement reaction?
    5·2 answers
  • A common characteristic of killers who choose poison as their weapon. This way they can avoid having to confront their victim me
    13·1 answer
  • CHEMISTRY HELP!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!