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4 years ago

What elements make up tin??

Chemistry

1 answer:

erik [133]4 years ago

8 0

Tin (Sn), a chemical element belonging to the carbon family, Group 14 (IVa) of the periodic table.

answer choices??

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Which of the following is true about the speed of light? (2 points) Group of answer choices

riadik2000 [5.3K]

Answer:

Speed of light is measured in vacuum and is equal to 671 million miles per hour, 1080 million kilometers per hour, 173 astronomical meters per second.

The exact value of speed of light is considered to total 299,792,458 meters per second

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4 years ago

Read 2 more answers

The bone of a dinosaur and the imprint of a leaf are examples of which kind of fossils?

Semmy [17]

the answer is body fossils which is B) body

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4 years ago

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Why do we need to be aware of the sound intensity of certain things

Alex

Answer:

It may blow your eardrums, or affect your hearing in other ways.

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2 years ago

Consider again the thermite reaction. If 0.0257 g Al react completely, what mass of Fe forms? Use the periodic table to find mol

maxonik [38]

The mass of Fe that is formed is 0.0532 grams

Explanation

Fe2O3 + 2 Al → Al2O3 + 2 Fe

Step 1: find the moles of Al

moles = mass/molar mass

from periodic table the molar mass of Al= 27 g/mol

moles = 0.0257g /27 g/mol =9.5 x10^-4 moles of Al

Step 2: use the mole ratio to determine the moles of Fe

the moles ratio of Al:Fe is 2:2= 1:1

therefore the moles of Fe is also = 9.5 x10 ^-4 moles

Step 3: find the mass of Fe

mass= moles x molar mass of Fe

from periodic table the molar mass of Fe= 56 g/mol

mass= 9.5 x10 ^-4 moles x 56 g/mol =0.0532 grams

6 0

3 years ago

Read 2 more answers

In an exactly.200M solution of benzoic acid, a monoprotic acid, the [H+] = 3.55 × 10–3M. What is the Ka for benzoic acid? 8.88 ×

kondaur [170]

Answer : Option C) 6.3 X $10^{-5}$ .

Explanation : Given is the concentration of benzoic acid is 0.200 M, now only one monoprotic acid ion is getting separated from it [ $[ H^{+} ]$ .

So, the reaction will be as,

$H C_{7} H_{6}O_{2}$ ⇔ $[ H^{+} ]$ + $C_{7} H_{6}O_{2}$ .

We can use the ICE method for calculation,
The molar concentration of $H C_{7} H_{6}O_{2}$ is 0.200 M and the [ $[ H^{+} ]$ is 3.55 X $10^{-5}$ .

So here on reactant side we get, (0.2 - 3.55 X $10^{-5}$ ) = 0.196
on the product it remains as 3.55 X $10^{-5}$ .

So, $K_{a}$ = (3.55 X $10^{-5}$ ) X (3.55 X $10^{-5}$ ) / 0.196

We will get $K_{a}$ as 6.42 X $10^{-5}$ which is close to 6.3 X $10^{-5}$ .

4 0

3 years ago