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zubka84 [21]
3 years ago
8

Could someone help me? Will give a scobby snack!

Chemistry
1 answer:
PilotLPTM [1.2K]3 years ago
3 0
1.)Venus is less massive that earth
2.)Nitrogen
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The device shown in the picture is used by electric utility power stations to produce electrical energy from _____ energy.A. Sol
tamaranim1 [39]

Answer:

where is the picture? I can't see anything

4 0
4 years ago
Read 2 more answers
Complete the following nuclear equations by entering the missing isotope:
Margarita [4]

The nuclear equation :

₈₂²¹⁴Pb ⇒ ₈₃²¹⁴Bi + ₋₁⁰e

<h3>Further explanation </h3>

Given

₈₂²¹⁴Pb

beta β ₋₁e⁰ particles

Required

Nuclear equation

Solution

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,  

  • alpha α particles ₂He⁴
  • beta β ₋₁e⁰ particles
  • gamma particles ₀γ⁰
  • positron particles ₁e⁰
  • neutron ₀n¹

The principle used is the sum of the atomic number and mass number before and after the decay reaction is the same

The reaction

₈₂²¹⁴Pb ⇒ X + ₋₁⁰e

The element X has

-the atomic number = 82 + 1 = 83

-the mass number = 214

In the periodic system, the element with atomic number 83=Bismuth

3 0
3 years ago
What statement best describes the difference between a scientific theory and a scientific law
pshichka [43]

Answer:In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory.

Explanation:

5 0
3 years ago
Need help with this Stoichiometry question
Inessa [10]

Hi!

<u>HCl is the limiting reactant.</u>

From the equation, we understand that 1 mole of Mg(OH)2 will react with 2 moles of HCl for the reaction to be complete. To find the limiting reactant we need to see which molecule is in lower quantity (in terms of moles and not mass)

Calculating the number of moles of Mg(OH)2 given

Using the formula, number of moles= mass / molecular mass

number of moles = 50.6 / 58 = ~ 0.872

Calculating the number of moles of HCl given

Number of moles = 45 / 36.5 = ~ 1.232


There are several ways to use this information  to calculate the limiting reactant. In our case, we can subtract the number of moles of Mg(OH)2 from the number of moles of HCl and check for the remainder.

If it is more than 0.872, then HCl would be in excess, with Mg(OH)2 being the limiting reactant; however, if the remainder is less than 0.872, it would mean <em>HCl is the limiting reactant.</em>

1.232- 0.872 = 0.36

As 0.36 < 0.872 , we see that HCl is the limiting reagent.

NOTE: this is in the case that the moles of HCl needed to complete the reaction is twice that of Mg(OH)2.


Hope this helps!

8 0
3 years ago
Read 2 more answers
Why does an increase in reaction temperature generally increase the reaction rate?
Gennadij [26K]
Increasing reaction temperature increased the kinetic energy in the system. In fact, the <em>measurement of</em> <em>temperature </em>indirectly relates the relative amount of kinetic energy in a system. 
An increase in kinetic energy results in more rapid and forceful molecular collisions, thereby increasing the rate of molecular interactions (and in a fixed-volume system, the pressure increases as well!). Hence, the reaction can occur more quickly.
4 0
4 years ago
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