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4 years ago

9

Hydrochloric acid and sodium hydroxide are mixed together to form salt and water. During the reaction, the temperature of the so

lution increases. Which of these best explains why this is considered to be a chemical change?

1 answer:

charle [14.2K]4 years ago

7 0

It's a chemical change because bonds are being broken and formed.

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he balanced net ionic equation for precipitation of CaCO 3 when aqueous solutions of Na 2CO 3 and CaCl 2 are mixed is ________.

ale4655 [162]

Answer:

Net ionic equation: $Ca^{2+}(aq.)+CO_{3}^{2-}(aq.)\rightarrow CaCO_{3}(s)$

Explanation:

Reaction between $Na_{2}CO_{3}$ and $CaCl_{2}$ is an example of double decomposition reaction where each cations and anions of each salt exchange their partners during reaction to form $CaCO_{3}$ and NaCl

$CaCO_{3}$ is an insoluble salt. Hence precipitation of $CaCO_{3}$ has been observed.

Molecular equation: $Na_{2}CO_{3}(aq.)+CaCl_{2}(aq.)\rightarrow 2NaCl(aq.)+CaCO_{3}(s)$

Total ionic equation:

$2Na^{+}(aq.)+CO_{3}^{2-}(aq.)+Ca^{2+}(aq.)+2Cl^{-}(aq.)\rightarrow CaCO_{3}(s)+2Na^{+}(aq.)+2Cl^{-}(aq.)$

Here $Na^{+}$ and $Na^{+}$ are spectator ions. Therefore they are eliminated from both side of total ionic equation to get net ionic equation.

Net ionic equation: $Ca^{2+}(aq.)+CO_{3}^{2-}(aq.)\rightarrow CaCO_{3}(s)$

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4 years ago

Which of the following are examples of strong electrolytes?

mihalych1998 [28]

B. Strong acids and Strong bases
Electrolytes are acids bases and salts

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3 years ago

What is greatest velocity? How do you get greatest velocity?

aksik [14]

Answer:

Maximum velocity is reached when you stop accelerating, because this is when you can't gain anymore speed, i.e. acceleration is zero. In other words the derivative of velocity is equal to zero. However, zero acceleration can also result in minimum velocity because you can't lose any more speed.

Explanation:

hope this helps

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3 years ago

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2CO (g) + O2 (g) → CO2 (g)<br><br> How many grams of O2 are needed to react with 6.64 L of CO2?

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3 years ago

Which element has the least density at STP?

vladimir2022 [97]

Answer:

Helium, this noble gas has the least density at STP

Explanation:

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3 years ago