CHEMISTRY HIGH SCHOOL

Why do scientific ideas change?

Answers

Answer 1
Answer:

Answer: because they make there hypothesis before they actually get the facts.

Explanation:

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A hydrogen atom cannot emit an alpha particle true false

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false.


Hope this helped. : )

If a hypothesis is tested repeatedly and is not proven false it may next become a - A) Law
B) Rule
C) Theory
D) Higher

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Theory. It might be disproved in the future, so it can not be a law until it solid as a rock. Brainliest the answer and I will explain more.

Can someone help plsCalculate the mass in grams of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

Answers

18.22 g of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

What is STP and how the amount of HCL came out to be 18.22 grams after the reaction?

  1. STP is standard temperature and pressure which is taken into account in the question to compare the value to standardized values.
  2. Here is given 5.6 L of hydrogen measured at STP reacting with an excess of chlorine gas.
  3. According to STP, T = 273 K , P= 1 atm , R = 0.0821L atm/K mol. The equation would be like: H2 + Cl2 = 2HCl .
  4. Now using ideal gas law , PV =nRT , n =PV/RT = 1 x 5.6L/0.0821Latm/K mol x 273 = 0.2498 mol.
  5. Now molar mass of HCl = 0.4996 x 36.485 = 18.22 g . Hence the amount of HCl produced would be 18.22 grams.

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Which of the following uses a nonrenewable energy resource to generate energy? A. nuclear power plant B. wind farm C. fireplace that burns wood D. biomass power plant

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The answer is bimass power plant.

If solving for the slope of the best fit line it is a good choice to choose the points closest to the line or points on the line.T OR F?

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This is true because the most accurate slope of the line would be given by the points that either reside on the line or close to it.

A chemical reaction is at equilibrium. Compared to the rate of the forward reaction, the rate of the reverse reaction is(1) faster and more reactant is produced
(2) faster and more product is produced
(3) the same and the reaction has stopped
(4) the same and the reaction continues in both directions

Answers

A chemical reaction is at equilibrium. Compared to the rate of the forward reaction, the rate of the reverse reaction is  the same and the reaction continues in both directions and the correct option is option 4.

What is Chemical Equilibrium?

Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.

It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.

Therefore, A chemical reaction is at equilibrium. Compared to the rate of the forward reaction, the rate of the reverse reaction is  the same and the reaction continues in both directions and the correct option is option 4.

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Answer:

choice 4

Explanation:

the reaction is constant but it does not stop, therefore it's choice 4
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