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4 years ago

Which actions represent endothermic reactions? Check all that apply.

Chemistry

2 answers:

marishachu [46]4 years ago

8 0

Answer:

Well, one is if heat is absorbed by the system from the surroundings, the system gains heat from the surroundings and so the temperature of the surroundings decreases.

Explanation:

Inessa05 [86]4 years ago

6 0

Answer

Explanation:And endothermic reaction is-A reaction that absorbs heat from the surroundings so choose the best answer that shows an endothermic reaction.I suggest that you find the answer with a exothermic reaction cut them from your answer choices then choose the answer choices you are left with then choose which answer is BEST.

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In an experiment, a student made a compund of sulfur and copper, and now she needs to find if the compound is copper (I) sulfide

finlep [7]

Answer: The formula for the given compound is $Cu_2S$

Explanation:

An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom. These are usually formed when a metal reacts with a non-metal.

The chemical formula of copper (I) sulfide is $Cu_2S$ because this is formed by the combination of $Cu^+$ ions and $S^{2-}$ ions

The chemical formula of copper (II) sulfide is $CuS$ because this is formed by the combination of $Cu^{2+}$ ions and $S^{2-}$ ions

To calculate the percent composition of element in a compound, we use the equation:

$\text{Percent composition of element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100$ ...........(1)

For copper (I) sulfide:

Mass of copper = (2 × 63.546) = 127.092 g/mol

Mass of copper (I) sulfide = 159.16 g/mol

Putting values in equation 1, we get:

$\text{Percent composition of copper in }Cu_2S=\frac{127.092g}{159.16g}=79.85\%$

For copper (II) sulfide:

Mass of copper = 63.546 g/mol

Mass of copper (II) sulfide = 95.611 g/mol

Putting values in equation 1, we get:

$\text{Percent composition of copper in CuS}=\frac{63.546g}{95.611g}=66.46\%$

Given compound:

Mass of copper in given compound = 0.8383 grams

Mass of given compound = 1.0440 grams

Putting values in equation 1, we get:

$\text{Percent composition of copper in given compound}=\frac{0.8383g}{1.044g}=80.29\%$

The percent composition of copper is close to the composition in copper (I) sulfide.

Hence, the formula for the given compound is $Cu_2S$

8 0

3 years ago

Antacids work to relieve stomach acids because of which of the following types of reactions?

Anastaziya [24]

Answer: The correct answer is Option B.

Explanation:

Decomposition is a type of chemical reaction in which larger compound breaks down into two or more smaller compounds.

$AB\rightarrow A+B$

Double displacement reactions is defined as the chemical reaction in which exchange of ions takes place.

$AB+CD\rightarrow AD+CB$

Synthesis reaction is a type of reaction in which two or more smaller compounds combines to form a single large compound.

$A+B\rightarrow AB$

Single displacement reaction is a type of reaction in which a more reactive metal displaces a less reactive metal from its chemical reaction.

$A+BC\rightarrow AC+B$

In stomach, an acid is present known as hydrochloric acid and to neutralize its effect, antacid is taken which has $CaCO_$ as a component.

The reaction between HCl and $CaCO_3$ is a type of neutralization reaction and it is a type of double displacement reaction.

The equation between the two follows:

$CaCO_3+HCl\rightarrow CaCl_2+H_2O+CO_2$

Hence, the correct answer is Option B.

4 0

3 years ago

Why does increasing the volume of a closed reaction container increase the thermal energy

lbvjy [14]

Answer:

Explanation:

An increase in the number of gas molecules in the same volume container increases pressure. A decrease in container volume increases gas pressure. An increase in temperature of a gas in a rigid container increases the pressure.

5 0

3 years ago

Go to the To Scale tab at the bottom of the simulation, and select Path from the central menu on the right. Set up a Planet-Moon

snow_lady [41]

Answer:

Go to the To Scale tab at the bottom of the simulation, and select Path from the central menu on the right. Set up a Planet-Moon simulation. Use the sliders to make both the planet and the moon as massive as possible, and then ... What do you notice about the moon's motion when it is closest to the planet?

Explanation:

3 0

3 years ago

Figure the molar mass of aluminum sulfate to the nearest gram

Brilliant_brown [7]

Should be that answer
342 gram

8 0

3 years ago