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olasank [31]
3 years ago
7

Pablo wants to enter the science fair. Which question could be answered through scientific investigation?

Chemistry
2 answers:
Oliga [24]3 years ago
7 0

Answer:

Hello

Explanation:

utd847dcpyc08td0

Ilya [14]3 years ago
7 0
What’s the question?
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In your own words, describe how the energy of a pendulum is changed as it moves through one cycle of its motion. Pls help online
ruslelena [56]

In a perfect world without air resistance, the top of the swing would have the most potential energy, but the least amount of kinetic energy. As the pendulum falls down, it gains more kinetic energy as it travels faster due to gravitational acceleration but loses more potential energy as it loses height. The total amount of energy in the system (the sum of kinetic and potential energy) stays the same.

3 0
4 years ago
Consider the exothermic reaction
alisha [4.7K]

Answer:

The answer to your question is -2855 J

Explanation:

Reaction

                     2C₂H₆  +  7O₂   ⇒   4CO₂  +  6H₂O

Formula

Heat of reaction = ΔHrxn = ΣΔHrxn products - ΣΔHrxn reactants

Substitution

ΔHrxn = { 4(-393.5) + 6(-241.8)} - {2(-84.7) + 7(0)}

ΔHrxn = {-1574 -1450.8} - {-169.4}

ΔHrxn = -3024.8 + 169.4

ΔHrxn = -2855.4 J

4 0
3 years ago
How many formula units make up 16.4 g of magnesium chloride (MgCl2)?
Svetach [21]

<span>molar mass of MgCl2  = 24.32 + 2 x (35.45) = 95.22 g</span><span>

<span>16.4g MgCl2 x (1 mol MgCl2/95.22 g MgCl2) = 0.172 mol MgCl2 </span>
 </span>
<span>0.172 mol MgCl2 x (6.022 x 10^23/1 mol MgCl2) = 10.36 x 10^22 atoms<span> </span></span>

8 0
3 years ago
Read 2 more answers
A piece of wood near a fire is at 23°c. it gains 1,160 joules of heat from the fire and reaches a temperature of 42°c. the speci
Alex73 [517]

The mass of the piece of wood is 35.58 g.

Joule = M × T × C

Where, M = mass

T = change in temperature(42C-23C=19 C)

C = specific heat capacity = 1.716 joules/gram

Substituting the values in the equation,

1160 = M × 19 × 1.716

M = 1160/32.604 = 35.58 g

Therefore, the mass of the piece of wood = 35.58 g

<h3>What is meant by specific heat capacity?</h3>

A material's specific heat capacity, which is defined as its heat capacity divided by its mass, determines how much energy is required to increase a gram's temperature by one degree Celsius (or one Kelvin)

<h3>What is mass?</h3>

Mass is the quantity of matter in a physical body.

To learn more about specific heat capacity visit:

brainly.com/question/1747943

#SPJ4

7 0
2 years ago
Which model of election configuration is the most accurate? The quantum mechanical atomic model The Rutherford atomic model The
Natasha_Volkova [10]

Answer:

Quantum mechanical atomic model.

Explanation:

The first model of electronic configuration was given by Bohr's model.

The most accurate model of electronic configuration is the quantum mechanical atomic model.

Bohr's model has various limitations:

1. It does not explain the Zeeman effect and stark effect.

2. It is not valid for multi-electron system.

3. Heisenberg uncertainty principle is not followed by this model

The quantum mechanical atomic model explains all the four quantum numbers for the electronic configuration of an atom in the periodic table.

The quantum mechanical atomic model considered the Heisenberg uncertainty principle.

7 0
4 years ago
Read 2 more answers
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