Which of the following was a major contribution to chemistry by Antoine Lavoisier

Answers

Answer 1

Answer: Antoine Lavoisier proved that oxygen is required for material to burn. Without oxygen, the fire goes out which is easily testable.

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A lahar is a type of mudflow that occurs?A. after a volcanic eruption
B. before a hurricane make landfall.
C. after a severe thunderstorm
D. during a tornado

Answers

A lahar is a type of mudflow that occurs after a volcanic eruption. It is a sort of mudflow or trash stream made out of a slurry of pyroclastic material, rough flotsam and jetsam, and water. The material streams down from a fountain of liquid magma, normally along a waterway valley. Lahar is the most deadly by-products of the eruption because of the speed they can travel.

A lahar is a type of mud flow that occurs? The answer is, A. after a volcanic eruption.

Why are units used that are to express the densities of gases different from those used to express the densities of solids or liquids

Answers

If the units for gases were the same as the units for numbers would be too small to be convenient.

For example, the density of iron is 7.87 g/cm³.

Using the same units, the density of hydrogen is 0.000 0899 g/cm³.

It is much more convenient to express the density in numbers that are easier to visualize: 0.0899 g/L, and that is still a small number.

When you buy muriatic acid at the hardware store, you are actually buying hydrochloric acid. if you poor it directly on your concrete, and if your concrete contains enough limestone in it, you can actually get a pretty cool reaction. what numbers, in the correct order from left to right, would go in the blanks in order to balance this equation: ___hcl(aq) ___caco3(s) → ___cacl2(aq) ___ co2(aq) ___ h2o(aq)

Answers

The balanced chemical equation for the reaction between hydrochloric acid ($HCl$) and calcium carbonate ($CaCO_3$) is:

2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l)

Final answer:

In the reaction of hydrochloric acid and calcium carbonate, to balance the equation, the correct order of numbers would be 2 for HCl, and 1 for CaCO3, CaCl2, CO2, and H2O.

Explanation:

When hydrochloric acid (HCl) reacts with calcium carbonate (CaCO3) in concrete, it forms calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O). To balance this reaction, you could input the numbers: 2 HCl(aq) + 1 CaCO3(s) → 1 CaCl2(aq) + 1 CO2(g) + 1 H2O(l). This phenomenon is part of the larger concept known as a neutralisation reaction, where an acid reacts with a base to produce a salt and water. In this case, the hydrochloric acid is the acid and the calcium carbonate in the concrete is the base. This is also an example of a gas evolution reaction, as carbon dioxide gas is being produced.

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Why do natural systems like the water in a pond rarely reach thermal equilibrium?

Answers

Final answer:

Natural systems like water in a pond rarely reach thermal equilibrium due to temperature differences and energy transfer limitations.

Explanation:

Natural systems like the water in a pond rarely reach thermal equilibrium due to various factors.

One reason is the presence of temperature differences in different parts of the pond. For example, during the summer, the upper layer of water is warmed by the Sun and doesn't mix with deeper, cooler water, causing thermal stratification.
Another reason is that energy transfer by heat requires a temperature difference. Once the two masses of water in the pond are mixed, there is no more temperature difference left to drive energy transfer by heat and do work.

These factors prevent the pond from reaching thermal equilibrium.

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What is the percent composition by mass of hydrogen in NH4HCO3 (gram-formula mass = 79 grams/mole)?

Answers

Answer:The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Explanation:

Molecular mass of the $NH_4HCO_3$ = 79 g/mol

Mass of the hydrogen atom present in one formula unit of $NH_4HCO_3$ :

$= 5* \text{(atomic mass of hydrogen)}=5* 1 g/mol= 5 g/mol}$

$\text{percentage of hydrogen}=\frac{\text{mass of the hydrogen in}NH_4HCO_3}{\text{molar mass of}NH_4HCO_3}* 100$

$\text{percentage of hydrogen}=(5g/mol)/(79 g/mol)* 100=6.32\%$

The percent composition by mass of hydrogen in $NH_4HCO_3$ is 6.32 %.

Answers: 6.3%

Explanation:

With #27. if you can do at least two and explain how

THANK YOU

Answers

KOH - Potassium hydroxide (The compound for potassium is K, hence the first part, and OH is for hydroxide so when you put them together it makes potassium hydroxide.. pretty self explanatory)
Ca(NO3)2 - Calcium nitrate (The symbol for calcium is Ca, next is NO which is nitrate and the 3 means that there are 3 Nitrate compounds..I am not 100% sure what the 2 means at the end, but I am guessing it means that there are 2 calcium nitrate compounds in all.)
MgCO3 - Magnesium carbonate
Na3PO4 -Trisodium phosphate
LiNO3 - Lithium Nitrate
Mg(C2H3O2)2 - Magnesium acetate

Alright, so to do this, you need to know the name of the elements and compounds, since all of these are ionic compounds which have different naming rules than covalent compounds, all you need is a periodic table and an ion chart. I'll do the first column.

A. Calcium Nitrate

B. Potassium Hydroxide

C. Magnesium Carbonate.

I also am including a picture of an ion chart that include almost all of the ions to help you with the rest of them.

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