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
Shalnov [3]
3 years ago
12

how was it possible that Mendeleev was able to predict the properties of elements that no one knew about

Chemistry
1 answer:
andrew-mc [135]3 years ago
7 0
<span>He used the patterns he found in properties of known elements to predict the properties of unknown elements.</span>
You might be interested in
Why is it important for scientists to keep testing a hypothesis even after they’ve found it to be true?
Drupady [299]

Answer: A hypothesis is generally based upon either someone else's observation or on previous studies.

Explanation: They just keep testing it to make sure it's <em>always </em>true.

6 0
3 years ago
For the balanced equation shown below, if 84.7 grams of H2S were reacted with 78.4 grams of O2, how many grams of H2O would be p
Klio2033 [76]
The mass  of  water  is  calculated  as   follows

  find  the  moles  of   each  reagent

that   is   moles =   mass/molar  mass

for  H2s  =  84.7/   34=   2.485  moles
      O2  =  78.4  /   32  =  2.45  moles

since    2  moles  of  H2S  react   with  3  moles  of O2  therefore  2.45  moles   of  oxygen  will  be  used  up  therefore  O2  is  the    limiting   reagent   and  H2S  is  in  excess

2H2S  +  3O2  ----->2So2   +  2H2O

by  use  of   mole   ratio  between  O2  and   H20   which  is  3:2  the   moles of  H2O  is  therefore  =  2.45 x2/3= 1.63  moles  of H2O

mass  of H2O  =  moles   x  molar  mass

=  1.63  g  x  18g/mol  =  29.4   g
4 0
4 years ago
1. empirical formula for Cu2o4?
Wittaler [7]

We know that

1) empirical formula of a compound is the representation of a molecules with the elements in simplest mole ratio.

2) the molar mass is the actual proportion of moles of elements present in a molecule

3) there is a simple ratio between the molar mass and empirical mass a molecule

Now let us solve each problem

1) empirical formula of Cu_{2}O_{4} will be CuO_{2}

2) empirical formula of Zn_{3}(NO_{3})_{4} will be Zn_{3}(NO_{3})_{4}

3) empirical formula of Ti_{2}S_{2.5} will be Ti_{4}S_{5}

4) the molecular formula will be :

Ratio=\frac{molarmass}{empiricalformula}=\frac{112.04}{28.01}=4

the molecular formula = 4 X empirical formula = 4 X CO = C_{4}O_{4}

5) the mole ratio of Cl and Cr is \frac{1.90}{0.631}=3

empirical formula will be CrCl_{3}

6 0
3 years ago
The type of compound that is most likely to contain a covalent bond is ________.
max2010maxim [7]
The type of substance that is most likely to contain a covalent bond is ONE THAT IS COMPOSED OF ONLY NON METALS.
Covalent bond is a type of chemical bond in which electron pairs are shared among the participating elements in order to achieve the octet form. Covalent bond is usually found among non metals.
6 0
3 years ago
Vanuation Question
Inessa05 [86]
Reckless driving I think
7 0
3 years ago
Other questions:
  • Make a food chain using sun, insects Toads snakes plants fungi deer spiders mice and coyotes in order
    12·1 answer
  • Help please!!! The name of the precipitate recovered by filtration is__________
    7·1 answer
  • Draw the major organic product of the reaction. Indicate the stereochemistry via wedge/dash bonds, including explicit H and D at
    8·1 answer
  • Question 6 1.75 pts The following reaction 2H2S(g)=2H2(g)+S2(g), Kc=1.625x10-7 at 800°C is carried out at the same temperature w
    10·1 answer
  • 5 atoms Pb to mol Pb
    9·1 answer
  • Who first determined the value of the avogadros number​
    7·1 answer
  • Mother is frying fish in the kitchen. The aroma of fried fish can be smelled by Sofea who is sitting in the living room. Explain
    5·1 answer
  • How many moles is ( 1 x 10^9 ) molecules O2
    9·1 answer
  • In a single displacement reaction Zinc can displace ALL but…
    5·1 answer
  • 2. If a gas at 500 mL has a temperature of 45°C, then what is the new volume when the temperature is increased to 65°C? Show you
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!