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3 years ago

Which contains elements with similar properties in the periodic table? A.) a period B.) a column C.) a row

Chemistry

2 answers:

jok3333 [9.3K]3 years ago

8 0

it would be a group

idk whuch of these mans group but its definetly not A) period

zysi [14]3 years ago

3 0

b............................................

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When two air masses collide at a front one air mass is pushed upward by the other?

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Typically the warm front is pushed upward and the cold pushed downward.

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4 years ago

Mixtures have no unique physical properties.<br> true or false

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4 years ago

The formula for a chemical reaction is given. 2Na + 2H2O → 2NaOH + H2 Which of the following describes this reaction? Group of a

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It is a reaction between an element and a compound that results in a different element and compound

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3 years ago

BRAINLIEST IF ANSWERED CORRECTLY WITH EXPLANATION! HELP PLEASE:)

elena-14-01-66 [18.8K]

First question

$Pb(NO_3)_2 + KI \rightarrow PbI_2 + KNO_3$

Balaneced:

$Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3$

Find how many moles potassium iodide it is in 345.0 grams

$n_{KI} = \frac{345.0 \ g}{166.0 \ g/mol} = 2.078 \ mole$

Find how many moles potassium nitrate there is for 2.078 moles $KI$

$n_{KNO_3} = \frac{2}{2} \cdot n_{KI} = 2.078 \ mole$

Find how many grams potassium nitrate there is in 2.078 moles $KNO_3$

$m_{KNO_3} = 2.078 \ mol \cdot 101.1 \ g/mol = 210.1 \ g$

Second question

$yield \ \% = \frac{experimental}{theoretical} \cdot 100 = \frac{195.3 \ grams}{210.1 \ grams} \cdot 100 = 93.0 \ \%$

4 0

3 years ago

5. Hydrogen & oxygen react chemically to form water. How much water

stepladder [879]

39.25 g of water (H₂O)

Explanation:

We have the following chemical reaction:

2 H₂ + O₂ → 2 H₂O

Now we calculate the number of moles of each reactant:

number of moles = mass / molar weight

number of moles of H₂ = 14.8 / 2 = 7.4 moles

number of moles of O₂ = 34.8 / 32 = 1.09 moles

We see from the chemical reaction that 2 moles of H₂ will react with 1 mole of O₂ so 7.4 moles of H₂ will react with 3.7 moles of O₂ but we only have 1.09 moles of O₂ available. The O₂ will be the limiting reactant. Knowing this we devise the following reasoning:

if 1 moles of O₂ produces 2 moles of H₂O

then 1.09 moles of O₂ produces X moles of H₂O

X = (1.09 × 2) / 1 = 2.18 moles of H₂O

mass = number of moles × molar weight

mass of H₂O = 2.18 × 18 = 39.25 g

Learn more about:

limiting reactant

brainly.com/question/7144022

brainly.com/question/6820284

#learnwithBrainly

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3 years ago