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
asambeis [7]
3 years ago
15

Why didn't scientists know about atoms for a long time

Chemistry
1 answer:
fredd [130]3 years ago
6 0
They didnt have a powerfull enough microscope to see them an when they could they were moving to fast unless they were cold

You might be interested in
1.505 times 10^23 Na atoms
Svet_ta [14]

Explanation:

Given:

Number of atoms = 1.505 x 10²³

Let us solve for the number of moles and mass of this atom of sodium.

A mole of a substance is the amount of that substance that contains the avogadro's number of particles.

     1 mole of Na = 6.02 x 10²³ atoms

Number of moles of Na  = \frac{1.505 x 10^{23} }{6.02 x 10^{23} }   = 0.25moles

Mass of Na = number of moles x molar mass

Molar mass of Na = 23g/mole

 Mass of Na = 0.25 x 23 = 5.75g

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

4 0
3 years ago
A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body. If this same amount of energy were trans
Brut [27]

The final temperature : 78.925°C

<h3>Further explanation  </h3>

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Energy releases = 130 kcal = 130 x 4.18 kJ=543.4 kJ

The final temperature :

\tt \Delta T=\dfrac{Q}{m.c}\\\\\Delta T=\dfrac{543.4}{2.5\times 4.186~kJ/kg^oC}\\\\\Delta T=51.925^oC

Final temperature :

ΔT=final-initial

51.925°c=final-27°c

final = 51.925+27=78.925°C

7 0
3 years ago
Which of the following is a biotic part of an environment?<br> mud<br> clams<br> sunshine<br> rocks
fredd [130]

Answer:

sunshine

Explanation:

because it's light u get it from the ecosystem

7 0
3 years ago
Read 2 more answers
Part A What are plate boundaries at which lithospheric plates that a) move toward each other, b) move past each other, and c) mo
Alex787 [66]

Answer:

a. Convergent boundary

b. Transform boundary

c. Divergent boundary

Explanation:

Convergent boundary are boundary where tectonic plates collide with each other. This kind of boundary might involve a collision between continental and oceanic plates, continental and continental plates and oceanic and oceanic plates. Generally, convergent boundary are regions for mountainous structures . Example of mountain formed through convergence are mountain Everest and Himalayas .

Transform boundary are boundary where tectonic plates move past each other . This kind of boundary is responsible for the creation of Extensive Fault like the San Andrea Fault.

Divergent boundary are boundary where tectonic plates move away from each other.  The diverging movements brings about oceanic ridges. The mid oceanic ridges is where magma rises to the surface to form a new crust. The up welling of this magma causes further separation of this plates.

The picture above illustrate convergent, divergent and transform boundary.

4 0
4 years ago
What normally determines whether a substance is a liquid, solid, gas, or plasma?
mrs_skeptik [129]
The motion or kinetic energy of the particles determine the state of matter
4 0
3 years ago
Other questions:
  • In the mitochondrial electron transfer chain, one of the steps that mediates transfer of electrons from NADH to O2 is the transf
    6·1 answer
  • Which balanced equation represents a redox reaction? a. AgNO3(aq) +NaCl(aq) →AgCl(s) +NaNO3(aq) b. H2CO3(aq) →H2O() + CO2(g) c.
    12·1 answer
  • Predict the product when pentanal reacts with ch3nh2 in the presence of an acid catalyst.
    5·1 answer
  • What is the percent of sodium in sodium chloride?
    15·1 answer
  • Describe the polarity of the molecule below and predict the shape of the molecule by looking at its Lewis dot structure.
    5·1 answer
  • What is the full name for an atom with 20 protons and 14 neutrons?
    7·1 answer
  • Uranium can be isolated from its ores b6 dissolving it as
    6·2 answers
  • Bài 2. gấp ạ. bt hóa 11
    9·1 answer
  • QUESTION 4<br> Balance this chemical equation. A H2S + B Ag ---&gt; C Ag2S + DH2
    5·1 answer
  • Explain your reasoning for your formula prediction for Ba+2 and S-2. A neutral molecule requires equal numbers of cations and an
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!