HELP!!!!!!!! 15 points and BRAINLIEST

Answer:

B. Volcanoes

Explanation:

B. Volcanoes

Answer:

B:Volcanoes

Explanation:

because valley rift develops

Answer:

3.3792 g

Explanation:

The balanced equation for the reaction is given as;

2 C2H2(g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g)

From the reaction;

2 mol of C2H2 requires 3 mol of O2

2.0 g of C2H2

Number of moles = Mass / Molar mass = 2 / 26.04 = 0.07680 mol

5.0 g of O2

Number of moles = Mass / Molar mass = 5 / 32 = 0.15625 mol

The limiting reactant is; C2H2

2 mol of C2H2 produces 2 mol of CO2

0.07680 mol produces x

Solving for x;

x = 0.07680 mol

Mass = Molar mass * Number of moles = 44 g/mol * 0.07680 mol = 3.3792 g

Answer:

Reaction 1 = -462.5 kJ/mol

Reaction 2 = -572 kJ/mol

Magnesium combustion = -601.83 kJ/mol

An exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.

The word exothermic means “releasing heat.” Energy, often in the form of heat, is released as an exothermic reaction proceeds.

Enthalpy of a reaction is defined as the heat energy change (Δ H) that takes place when reactants go to products. If heat is absorbed during the reaction, Δ H is positive; if heat is released, then Δ H is negative.

ΔH value negative –> energy released –> exothermic reaction

ΔH value positive –> energy absorbed –> endothermic reaction

Therefore, an exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.

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Answer:

am not sure but I think it c

Answer:

it’s A and B and the last one I still am trying to figure out.

Explanation:

Answer:

sweating

Explanation:

why do I need 20 words

Answer:

T2 = 816.8 ( To one d.p)

Explanation:

Volume= 2.5 L

Initial Temperature T1 = 297 K

Initial Pressure P1 = 120 kPa

Final Pressure P2 = 330 kPa

Final Temperature T2 = ?

The relationship between pressure and temperature is given by the equation;

P1 / T1 = P2 / T2

T2 = P2 * T1 / P1

Inserting the values;

T2 = 330 * 297 / 120

T2 = 816.75 K

Answer:

A titanium ion

Answer:

FILTRATION.

filter the solution and separate sand and salt solution

evaporation

evaporate the water and salt mixture and salt will be left as a solid

Answer:

As a human being, we are considered to be a heterotroph because we rely on other organisms for food.

We have that for the Question "How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C." it can be said that Moles of gas is

n= 0.059 moles of gas

From the question we are told

How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"

Generally the equation for the   is mathematically given as

[tex]P=\frac{600}{760}\\\\P=0.789atm[/tex]

Therefore

[tex]n=\frac{PV}{RT}\\\\Therefore\\\\n=\frac{PV}{RT}\\\\n=\frac{0.789*2.2}{0.08206*(85 + 273)}\\\\[/tex]

n= 0.059 moles of gas

Therefore

Moles of gas is

n= 0.059 moles of gas

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Answer:

amplitude or pitch

Explanation:

Answer:

balanced equation of glucose

6CO2 + 6H2O----------C6H12O6 + 6O2

in the presence of sun light.

Answer:

3 m/s²

Explanation:

First, find the change in velocity.

13 - 1 = 12

Divide the change in velocity by the time it took to cross this distance.

12/4 = 3

3 m/s² is the average acceleration of the lizard.

Answer:

toxic substances to humans

Explanation:

Answer:

Toxic substance to humans

Explanation:

Lead is a naturally occurring element found in small amounts in the earth’s crust. While it has some beneficial uses, it can be toxic to humans and animals, causing health effects.

Answer:

0.423M

Explanation:

The reaction of acetic acid with NaOH is:

CH₃CO₂H + NaOH → CH₃CO₂Na + H₂O

That means the moles of NaOH added = Moles acetic acid in the solution

To solve this problem we need to find the moles of NaOH added to find the moles of acetic acid and its concentration using its volume as follows:

Moles NaOH:

29.6mL = 0.0296L * (0.250mol / L)= 0.0074 moles NaOH = Moles acetic acid

Molarity acetic acid:

0.0074 moles / 0.0175L =

Answer:

FALSE

Explanation:

Answe AgNO₃

1:1:3 ratio

Answer:

SUN

Explanation:

Hope this helps! Plz mark as brainliest!

Answer:

section c

Explanation:

section A shows the soild state

section B shows the transition of solid to liquid

section C shows the the pure liquid state

section D shows the transition of liquid to gas

section E shows the pure gas state

Answer:

nitric acid + iron=iron+[nitric acid ] 2 hydrogen

The net ionic equation will be Fe → [tex]Fe^{2+}[/tex].

The net ionic equation would be a chemical equation which only indicates the elements, compounds, as well as ions instantly involved in a chemical reaction.

The given chemical equation is:

HNO3+Fe → Fe(HNO3)2 +H2​

It can be written in term of ionic equation.

[tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]+Fe → [tex]Fe^{2+}[/tex] + [tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]

Hydrogen ion and nitrate ion will be canceled each other.

Hence, the net ionic equation will be

Fe → [tex]Fe^{2+}[/tex]

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Explanation:

You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.

Answer:

No.

Materials like water get evaporated when heated, but materials like camphor get sublimed that is they directly get converted into gaseous form when heated, while materials like copper gets melted on heating

Answer:

plastic, glass, and electronics

Explanation:

those take longer to erode than normal trash.

Answer:

virtual

Explanation:

because we cannot touch or sense it

Answer:

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