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3 years ago

A company that is concerned about the environment wants to encourage the use of their fuel cell cars, so they are putting

Chemistry

2 answers:

aleksley [76]3 years ago

8 0

Fossil cell cars reduce use of non renewable fossil fuels.

Juli2301 [7.4K]3 years ago

6 0

Answer:

B. Fuel cell cars reduce use of non-renewable fossil fuels

Explanation:

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What will happen to the volume of a gas if the Kelvin temperature of the gas is reduced to 1/4 of the original temperature and t

Temka [501]

Answer:

the volume of the gas will be 1/8 of the original value

Explanation:

7 0

3 years ago

For the reaction C6H6 + ? O2 → ? CO2+? H2O , what is the maximum amount of CO2 which could be formed from 6.59 g of C6H6 and 6.6

Likurg_2 [28]

Answer: 3.52 grams

Explanation:

$2C_6H_6+15O_2\rightarrow 12CO_2+6H_2O$

Given moles:

moles of oxygen = 6.62

moles of $C_6H_6=\frac{\text {given mass}}{\text {molar mas}}=\frac{6.59g}{78g/mol}=0.08moles$

According to stoichiometry:

2 moles of benzene reacts with = 15 moles of oxygen

Thus 0.08 moles of benzene will react with = $\frac{15}{2}\times 0.08=0.6$ moles of oxygen

Thus benzene is the limiting reagent as it limits the formation of products and oxygen is the excess reagent.

As 2 moles of benzene produce = 12 moles of carbon dioxide

0.08 mole of benzene will produce = $\frac{12}{2}\times 0.08=0.48moles$ of carbon dioxide

Mass of carbon dioxide= $moles\times {\text {Molar mass}}=0.48\times 44=3.52g$

Thus 3.52 g of carbon dioxide are produced.

4 0

4 years ago

How do the alkali metals differ from the alkaline earth metals?

Alik [6]

Answer & Explanation:

The alkali metals are the elements found in the first group of the periodic table.

Alkaline earth metals are found in the second group of the periodic table.

Alkali metals are Lithium (Li), sodium(Na), potassium (K), Rubidium (Rb), Cesium (Cs) and Francium (Fr).

Alkaline earth metals include; Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radium (Ra).

Alkali metals are very reactive and none of these metals do not occur as free metals in nature.
Alkaline metals are also do not occur freely in nature and they are also very reactive.

For alkali elements, the densities of Lithium and Sodium are less than the density of water. However, the other elements are denser than water. Many of alkali metal compounds (NaCl, KCl, Na2, CO3, NaOH) are commercially very important.

Alkaline elements in this group are denser than water.

7 0

3 years ago

Pls HELP!!!! Why does copper oxide appear on a penny faster when a penny is heated in a flame than when the penny is at room tem

balu736 [363]

The rate of reaction between oxygen and copper is higher at high temperature. The rate of reaction between oxygen and copper is lower at room temperature.

at high temperature copper penny will react with oxygen as shown below

$2Cu(s)+O_{2}-->2CuO$

The reaction does not occur easily at room temperature

We can say that the reaction between copper and oxygen is an endothermic reaction so the rate of reaction is high at high temperature.

The bond energy of oxygen molecules need energy to react with copper and form copper oxide.

5 0

3 years ago

The Ka of an acid is 1.3 x 10–7. Based on the Ka and its relationship with Kw, what is the value of Kb?

Solnce55 [7]

Ka x Kb = Kw Kw = 1 x 10⁻¹⁴

(1.3 x 10⁻⁷) x Kb = 1 x 10⁻¹⁴

Kb = ( 1 x 10⁻¹⁴ ) / ( 1.3 x 10⁻⁷)

Kb = 7.7 x 10⁻⁸

Answer D

hope this helps!

6 0

3 years ago

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