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enyata [817]
2 years ago
8

Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compound.

The chemical formula for cardenolides is shown below.
CH18C20H15CHCO2

How many atoms of each element are in one molecule of cardenolides?




A)
34 carbon atoms, 43 hydrogen atoms, and 2 oxygen atoms




B)
42 carbon atoms, 23 hydrogen atoms, and 2 oxygen atoms




C)
20 carbon atoms, 33 hydrogen atoms, and 2 oxygen atoms




D)
23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms
Chemistry
1 answer:
igor_vitrenko [27]2 years ago
4 0

Answer:

the answer is D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms

Explanation:

i took the test and got a 100%

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How many nitrogen atoms are represented in 2Ca(NO3)2?
arsen [322]

Explanation:

there is 2 nitrogen but if you mean nitrate is 6

4 0
3 years ago
Which is the limiting reagent in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2
NemiM [27]

Answer:

CuSO4

Explanation:

Na2S + CuSO4 → Na2SO4 + CuS

The reaction is balanced (same number of elements in each side)

To determine limiting reagent you need to know the moles you have of each.

Molar mass Na2S = 23 * 2 + 32 = 78

Molar mass CuSO4 = 63.5 + 32 + 16 * 4 = 159.5

Na2S mole = 15.5 / 78 = 0.2

CuSO4 mole = 12.1/159.5 = 0.076

*Remember mole = mass / MM

With that information now you have to divide each moles by its respective stoichiometric coefficient

Na2S stoichiometric coefficient : 1

Na2S : 0.2 / 1 = 0.2

CuSO4 stoichiometric coefficient: 1

CuSO4: 0.076 / 1 = 0.076

The smaller number between them its the limiting reagent, CuSO4

8 0
3 years ago
What is true about energy in an ordinary chemical reaction? Energy is
RSB [31]
Energy is not created or destroyed due to the law of Conservation of Energy. Hope this helps!
3 0
3 years ago
Read 2 more answers
An average person expends about 845 kilojoules of energy per hour of walking. Suppose a person eats 2 baked potatoes with butter
ExtremeBDS [4]

Answer:

         \large\boxed{2hours}

Explanation:

You will need to use the conversion between food calories, calories and joules.

       1\text { nutritional calorie }= 1,000cal\\ \\ 1cal=4.184joule

From a nutritional table (from the internet) you can obtain the amount of nutritional calories for each type macronutrient:<em> carbohydrates, protein, and fat.</em>

Macronutrient      food calories

Carbohydrate         4 cal/g

Protein                    4 cal/g

Fat                           9 cal/g

To convert food calories to regular calories, mutiply by the conversion factor:

                1=1,000cal/\text{nutritional calorie}

Macronutrient        calories

Carbohydrate         4,000 cal/g

Protein                    4,000 cal/g

Fat                           9,000 cal/g

To convert regular calories to joules, multiply by the conversion factor:

               1=4.184 joule/1cal

Macronutrient        energy in joules

Carbohydrate         16,736 joule/g

Protein                    16,736 joule/g

Fat                           37,656 joule/g

Now you can multiply the grams of each macronutrient in one potato by its energy content:

Macronutrient        energy/gram     ×   grams  =  total energy

Carbohydrate         16,736 joule/g   ×   37 g      =  619,232 joules

Protein                    16,736 joule/g   ×   4.3 g     =  71,968.8 joules

Fat                           37,656 joule/g  ×   4 g        = 150,624 joules

Total = 619,232 joules + 71,968.8 joules + 150,624 joules = 841,820.8 joules.

Since they are <u>two potatoes</u>, multiply by 2: × 841,820.8 joules = 1,683,641.6 joules.

Divide by 1,000 to convert to kilojoules = 1,683.64 kilojoules

Divide the total energy from the two potatoes by the <em>energy that an average person expend per hour of walking (845 kilojoules of energy per hour):</em>

       1,683.64kilojoules/845kilojouesl/hour=1.99hours\approx 2hours

7 0
3 years ago
Will mark brilliant pls help question is above​
Degger [83]

Answer:

a.) The garden plants provide energy to all the other organisms. While not every organism consumes garden plants directly, every organism's food lineage can be traced to garden plants. For instance, while ground beetles do not directly consume garden plants, they do eat snails, and snails eat garden plants.

b.) The slug population might increase is the aphid population decreased because there would be less competition for food resources. Both populations consume garden plants, and there is only a finite number of garden plants. Therefore, there is a limit that each population can consume. If there were less aphids eating the garden plants, there would be more left for the slugs. Less starving slugs would lead to greater reproduction and thus a higher slug population.

4 0
2 years ago
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