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3 years ago

Why do cats purr to get attention

1 answer:

5 0

Cats purr when they are stressed, in pain or sick because cat purrs have healing powers. Not all cat purrs are purrs of contentment. Cats purr when they are stressed, in pain or severely ill. ... There are also reports that cats heal faster than other animals that do not purr, and that purring releases endorphins.

hope this helped :)
alisa202

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_S8+ _02 - SO3

Anton [14]

Answer:

a) $S_8+12O_2\rightarrow 8SO_3$

b) Combination or synthesis reaction

$1molS_8:12molO_2;or\\ \\ \\ \dfrac{1molS_8}{12molO_2}$

d) 30 g.

Explanation:

a. Balance the Equation

To balance the equation you must add the coefficients that yield the same number of atoms for the same kind of atoms on each side of the chemical equation.

You cannot modify the superscripts because the they are part of the chemical formula of the compound or molecule, they indicate the number of atoms of each kind inside the compound, i.e. they determine the composition substance.

The coefficients can be adjusted because they just indicate the number of units that react or are produced.

Starting from the skeleton equation:

$S_8+O_2\rightarrow SO_3$

Add an 8 before the SO₃ to balance the S atoms:

$S_8+O_2\rightarrow 8SO_3$

Now add a coefficient of 12 for the O₂ molecule on the left side:

$S_8+12O_2\rightarrow 8SO_3$

If you count:

Atom Leff side Right side

S 8 8

O 24 24

Thus, the equation is balanced.

b. What type of chemical reaction is this?

When two elements or compounds combine to form one single compound that is a combination reaction.

The general form of a combination reaction is:

A + B → AB

This is called comibnation to distinguish from single replacement, double replacement, decompositon, and combustion reaction.

It is also named synthesis reaction because a new compound is being synthetized ("created") from simpler substances.

The combination of a non-metal and oxygen is a typical reaction of synthesis in which a basic oxide is produced. They are named basic oxides because they react with water to form a base: hydroxide.

c. What is the molar ratio of S₈, to O₂?

The mole ratio also called theoretical or stoichiometric mole ratio is the ratio of coefficients of the substances. The mole ratio of the reactants indicate the proportion in which the reactants combine to each other to form the product or products.

Then, take the coefficients of S₈ and O₂ from the balanced molecular chemical equation and form the ratio:

$1molS_8:12molO_2;or\\ \\ \\ \dfrac{1molS_8}{12molO_2}$

That means that every molecule (or mole of molecules) of S₈ reacts with 12 molecules (or mole of molecules) of O₂ to form the products: in this case 8 molecules (or mole of molecules of SO₃).

You use this ratio to determine the yield of the reactions in a procedure called stoichiometric calculations.

d. How many grams of O₂ should be used if 100 grams of SO₃, is the desired end product?

You will need the mole ratio of O₂ to SO₃ and the molar masses of both substanes.

Mole ratio:

$\dfrac{8molSO_3}{12molO_2}$

Moles of SO₃

moles = mass in grams/molar mass

molar mass of SO₃ = 80.066g/mol

moles of SO₃ = 100g / 80.066g/mol = 1.25 mol SO₃

Moles of O₂

$1.25molSO_3\times 12molO_2/8molSO_3=1.875molO_2$

Conver to mass of O₂

molar mass of O₂ = 15.999 g/mol

mass of O₂ = 1.875mol × 15.999g/mol = 29.998 g

Round to 1 significant figures: 30 g.

6 0

3 years ago

Which of the following is NOT a property of an acid?

MrMuchimi

the correct answer is feels slippery

5 0

3 years ago

How many molecules of sugar are there in 1 can of soda?

Korvikt [17]

Answer:

$5.8\cdot 10^{22}$

Explanation:

Since no information was provided about the can of soda, let's take an example of 1 can of 12 fl oz (368 g) Coca-Cola.

The nutrition facts state that it contains 33 g of sugar. In order to calculate the number of molecules, we firstly need to know the molecular formula of sugar. Sugar can be represented by $C_{12}H_{22}O_{11}$ .

Our first step is to find the molar mass of sugar:

$M_{C_{12}H_{22}O_{11}} = 342.3 g/mol$

Secondly, dividing mass of sugar, $m = 33 g$ , by the molar mass will yield the number of moles of sugar:

$n_{C_{12}H_{22}O_{11}}=\frac{m}{M}$

Finally, multiplying moles by the Avogadro's constant will yield the number of molecules:

$N_{C_{12}H_{22}O_{11}}=n_{C_{12}H_{22}O_{11}}\cdot N_A =\frac{m}{M} \cdot N_A = \frac{33 g}{342.3 g/mol} \cdot 6.022 \cdot 10^{23} mol^{-1} = 5.8\cdot 10^{22}$

8 0

4 years ago

Which is an example of how society affects science?

Evgesh-ka [11]

Answer: Laws have been passed banning the production of a living copy of a person.

i just took the test so i know the answer is correct.

6 0

4 years ago

Read 2 more answers

What are the three types of plate boundaries? What is the direction of movement at each boundary?

pav-90 [236]

There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries.

This image shows the three main types of plate boundaries: divergent, convergent, and transform.

This image shows the three main types of plate boundaries: divergent, convergent, and transform. Image courtesy of the U.S. Geological Survey. Download image (jpg, 76 KB).

The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.

A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge and Pacific Ring of Fire are two examples of divergent plate boundaries.

When two plates come together, it is known as a convergent boundary. The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench. A chain of volcanoes often forms parallel to convergent plate boundaries and powerful earthquakes are common along these boundaries.

At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents. Thus, at convergent boundaries, continental crust is created and oceanic crust is destroyed.

Two plates sliding past each other forms a transform plate boundary. One of the most famous transform plate boundaries occurs at the San Andreas fault zone, which extends underwater. Natural or human-made structures that cross a transform boundary are offset—split into pieces and carried in opposite directions. Rocks that line the boundary are pulverized as the plates grind along, creating a linear fault valley or undersea canyon. Earthquakes are common along these faults. In contrast to convergent and divergent boundaries, crust is cracked and broken at transform margins, but is not created or destroyed.

8 0

3 years ago