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4 years ago

7

Which represents an endothermic reaction? wood burning in a fire splitting a gas molecule changing frost to water vapor TNT expl

oding

2 answers:

scoundrel [369]4 years ago

8 0

Answer:

changing frost into water vapors.

Explanation:

KIM [24]4 years ago

6 0

Answer:

(C)Changing frost to water vapor

Explanation:

melting, boiling, evaporation, and sublimation are endothermic processes

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Bismuth (V) nitrate + strontium hydroxide

mamaluj [8]

Answer: $2Bi(NO_3)_5(aq)+5Sr(OH)_2(aq)\rightarrow 2Bi(OH)_5(s)+5Sr(NO_3)_2(aq)$

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.

The balanced chemical equation is:

$2Bi(NO_3)_5(aq)+5Sr(OH)_2(aq)\rightarrow 2Bi(OH)_5(s)+5Sr(NO_3)_2(aq)$

3 0

3 years ago

At a particular pressure and temperature, nitrogen gas effuses at the rate of 79 mL/s. Under the same conditions, at what rate w

amm1812

Rate of Sulfur dioxide : 2730.44 mL/s

<h3>Further explanation </h3>

Graham's law: <em>the rate of effusion of a gas is inversely proportional to the square root of its molar masses or </em>

the effusion rates of two gases = the square root of the inverse of their molar masses:

$\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }$

or

$\rm M_1\times r_1^2=M_2\times r_2^2$

MW of N₂ = 28 g/mol

MW SO₂ = 64 g/mol

$\tt 28\times 79^2=64\times r_2^2\\\\r_2^2=\dfrac{28\times 79^2}{64}=2730.44~mL/s$

3 0

3 years ago

Decane (C10H22) can be split into propene (C3H6) and heptane (C7H16) by cracking

notka56 [123]

Answer:

Hydrocarbons

Explanation:

They all are made up of only carbon and hydrogen atoms, so they're organic molecules known as hydrocarbons. Decane and Heptane are alkanes, Propene is an alkene.

3 0

3 years ago

Tungsten (W), Copper (Cu), and Iron (Fe) all belong to what family on the periodic table?

Dahasolnce [82]

Transition metals.

I have to write 20 so this is filler.

3 0

3 years ago

a sample of compound determined to contain 1.71 g C and 0.287 g H. The corresponding empirical formula is

fiasKO [112]

Answer: The empirical formula is $CH_2$ .

Explanation:

Mass of C = 1.71 g

Mass of H = 0.287 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{1.71g}{12g/mole}=0.142moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.287g}{1g/mole}=0.287moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{0.142}{0.142}=1$

For H = $\frac{0.287}{0.142}=2$

The ratio of C: H = 1: 2

Hence the empirical formula is $CH_2$ .

4 0

3 years ago