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3 years ago

Someone who enjoys chemistry i need help with an online class

Chemistry

1 answer:

sertanlavr [38]3 years ago

3 0

I like chemistry but it depends on what level it is

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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

Which statement accurately describes the atoms of a specific element? explain your answer in complete sentences.

Vladimir [108]

Answer:

B. A Tin, Sn, atom contains 50 electrons outside the nucleus and 69 neutrons inside the nucleus

Explanation:

Tins number of electron and neutron are of number mostly found yet Ne has its neutron 10 mostly but it's 11 here

i guess

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4 years ago

The two factors that cause technology to progress

Paul [167]

Research and new advancements in discoveries like fingerprint unlock for phones.And 3d printers.They were made by researching and discovering new things.

8 0

3 years ago

Produced by the stomach to destroy bacteria

dalvyx [7]

Answer:

Your stomach lining also secretes hydrochloric acid, which creates the ideal conditions for the protein-digesting enzymes to work. The potent hydrochloric acid kills bacteria, protecting your body from harmful microbes which can enter your body in food.

4 0

3 years ago

Which statements describe abiotic factors in an environment? Check all that apply.

olga nikolaevna [1]

Soil retains water and nutrients.

Several rocks rest in a stream.

Clouds create shade that changes temperatures

Abiotic factors are non-living components in the environment, or rather components in the environment that are not derived from life.

Explanation:

Abiotic factors interact with biotic factors to create ecoystems. An example of biotic factors interacting with abiotic factors include plants utilizing sunlight for photosynthesis and a wild beast drinking water form a watering hole in the middle of the savanna.

Learn More:

For more on biotic and abiotic factors check out;

brainly.com/question/11015328

brainly.com/question/11483587

brainly.com/question/1542938

brainly.com/question/12689972

brainly.com/question/935464

#LearnWithBrainly

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3 years ago

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