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3 years ago

Please help me answer this question

Chemistry

2 answers:

Alisiya [41]3 years ago

8 0

Answer with explanation:

1) general word equation=acid + metal= salt + hydrogen gas

chemical/balanced equation= 2HCl+Mg=MgCl2+H2

2)The gas thus formed is an effervescent carbon di oxide when calcium chloride reacts with hydrochloric acid. the carbon di oxide gas also acts as an extinguisher for fires. Hence the burning candle is extinguished.

tester [92]3 years ago

7 0

1) metal reacts with acid to produce hydrogen gas and salt

an example of the reaction will be
2Na+ 2HCl —> 2NaCl +H2

2) we know the metal in compound A is calcium as one of the compound formed is calcium chloride.

the gas that’s causing effervescent effect is CO2 as CO2 is non polar and does not mix with water hence appears as bubbles. there are 2 possible calcium compounds that can produce CO2 with addition of HCl.

those compounds are calcium carbonate (CaCO3) and Calcium Bicarbonate ( Ca(HCO3)2 )

reaction for both possible compounds
- CaCO3 + 2HCl —> CaCl2 + H2O + CO2
- Ca(HCO3)2 + 2HCl —> CaCl2 + 2H2O +2CO2

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Assume that the ΔHo and ΔSo of vaporization do not change significantly with temperature. Calculate the vapor pressure of CH3OH

expeople1 [14]

We are given with
ΔHo = 38.0 kJ
ΔSo = 112.9
for these standard conditions:
To = 25 C
Po = 1 atm

Using the Clapeyron Equation
ln (P/Po) = (ΔHo / R)(1/T1 - 1/T2)
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4 years ago

Write the balanced equation for the reaction of 1 mol of naoh with 1 mol of h2po4

solmaris [256]

Answer:

3 NaOH + H₃PO₄ -----> Na₃PO₄ + 3 H₂O

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another. Therefore, Na⁺ (from NaOH) is swapped with H⁺ (from H₃PO₄). When constructing the new compounds, you may need to alter the amount of each ion within a particular compound to to make it neutral.

New Product #1: Na₃PO₄

----------> Na⁺ and PO₄³⁻

----------> +1 + 1 + 1 + (-3) = 0

New Product #2: H₂O (or HOH)

----------> H⁺ and OH⁻

----------> +1 + (-1) = 0

Now that you know the products, you need to balance the chemical equation. An equation is balanced when there is an equal amount of each element on both sides. These amounts can be modified by adding coefficients.

The unbalanced equation:

NaOH + H₃PO₄ -----> Na₃PO₄ + H₂O

Reactants: 1 sodium, 5 oxygen, 4 hydrogen, 1 phosphorus

Products: 3 sodium, 5 oxygen, 2 hydrogen, 1 phosphorus

The balanced equation:

3 NaOH + H₃PO₄ -----> Na₃PO₄ + 3 H₂O

Reactants: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

Products: 3 sodium, 7 oxygen, 6 hydrogen, 1 phosphorus

**I was having trouble balancing the equation with the reactant H₂PO₄⁻. From my experience, I believe this compound may have been mistyped. As such, I used H₃PO₄. Please let me know if the reactant was written properly**

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2 years ago

what two errors in the data will result if you raise the temperature of the melting point apparatus too quickly?

grandymaker [24]

The two errors in the data resulting from an experiment where the temperature is raised too quickly are: First, the melting point temperature may not be recorded correctly since it cannot be monitored closely if the heat supplied is too high.

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3 years ago

Dipole-dipole interactions are (weaker than, stronger than, equal to) hydrogen bonds.

kozerog [31]

Answer and Explanation:

Dipole-Dipole interactions are weaker than hydrogen bonds.

Hydrogen bonds are a form of dipole-dipole interactions, being the strongest form of dipole-dipole interactions.

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3 years ago

Which pair of substances would most likely result in the production of a gas when reacting with an acid?

vovangra [49]

Answer: metal and carbonate

Explanation:

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions $(OH^-)$ when dissolved in water and an acid is defined as a substance which donates hydrogen ions $(H^+)$ in water.

An acid is represented as :

$HX\rightarrow H^++X^-$

1. When metal is treated with an acid such as $HCl$ , if the metal is more reactive than hydrogen displaces hydrogen from its salt solution and thus produce zinc chloride and hydrogen gas.

$M+xHCl(aq)\rightarrow MCl_x(aq)+xH_2(g)$

2. When carbonates are treated with acid, double displacement takes place ad carbon dioxide is released as a gas.

$MCO_3(aq)+xHCl(aq)\rightarrow MCl_x(aq)+xH_2O(l)+CO_2(g)$

7 0

4 years ago

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