Help me to answer the question please

Answer:

[tex]\boxed {\boxed {\sf 60 \%}}[/tex]

Explanation:

Percent yield is a ratio of the actual yield to the theoretical yield. It is found using this formula:

[tex]\% \ yield= \frac {actual \ yield}{theoretical \ yield} *100[/tex]

The actual yield is 12 liters, because that was actually produced in the lab.

The theoretical yield is 20 liters, because that was the expected yield.

[tex]\% \ yield= \frac {12 \ L}{20\ L} *100[/tex]

[tex]\% \ yield= 0.6*100[/tex]

[tex]\% \ yield= 60[/tex]

For this reaction, the percent yield is 60%.

Answer:

Explanation:

ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.

Answer:

No, it is not a mineral

Explanation:

Emerald is an important gemstone. It is famous for its green colour. Emerald is one of the most valuable gemstones. It is very much useful in the production of jewelry.

Emerald can be created in the laboratory. Such laboratory created emerald are still regarded as real emerald but they are not minerals. Only naturally occurring emeralds are minerals.

Answer:

The slope of the line is [tex]-\frac{10}{7}[/tex].

Explanation:

The slope of the line ([tex]m[/tex]) is the change in dependent variable ([tex]y[/tex]) divided by the change in independent variable ([tex]x[/tex]):

[tex]m = \frac{y_{f}-y_{o}}{x_{f}-x_{o}}[/tex] (1)

If we know that [tex](x_{o}, y_{o}) = (0, 2)[/tex] and [tex](x_{f}, y_{f}) = (1.4, 0)[/tex], then the slope of the line is:

[tex]m = \frac{0-2}{1.4-0}[/tex]

[tex]m = -\frac{10}{7}[/tex]

The slope of the line is [tex]-\frac{10}{7}[/tex].

Answer:

-3/2

Explanation:

L its correct

Answer:

Beryllium.

Silicon.

Explanation:

Beryllium has 2 electrons in their outermost shell and has highly reactive than boron because Boron needs 3 electrons to lose whereas, beryllium needs to lose only 2 electrons to get stability. Silicon has 4 electrons in its outermost shell and is less reactive than aluminum because aluminum has to lose 3 electrons to get stability as compared to silicon which needs 4 electrons to lose to be stable and non-reactive.

Answer:

I believe it is a chemical change

Explanation:

because it is changing into something new

Answer: They all are vascular plants.

Explanation:

Gymnosperms are the plants which have naked seeds and ovules. They do not produce flowers. The angiosperms are the flowering plants. The ovules are enclosed inside the female flower. They produce seeds. The ferns are the seedless plants, they reproduce via spores. Gymnosperms, angiosperms and ferns share common characteristics like they have vascular system that is tissues like xylem and phloem help in conduction of water and minerals from the soil. The plant body is differentiated into root, stem and leaves. They all have photosynthetic pigments in them.

Answer:

2H2(g)+O2(g)→2H2O(l)

Explanation:

Answer:

See explanation

Explanation:

On the pH scale acidity ranges from pH values of 0-6.9. Natural rain water is slightly acidic due to the presence of carbon dioxide in the atmosphere which is an anhydride of carbonic acid.

CO2(g) + H2O(l) -------> H2CO3(aq)

B. The equations that turn sulfur to sulfuric acid are;

S(l) + O2(g) -----> SO2(g)

2SO2(l) + O2(g) -----> 2SO3(g)

SO3(g) + H2SO4(l) -----> H2S2O7(l)

H2S2O7(l) + H2O(l) ----> 2H2SO4(l)

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At pH 6, H^+ concentration = 1 * 10^-6 M

At pH 2, H^+ concentration = 1 * 10^-2 M

Hence;

1 * 10^-2/1 * 10^-6

= 10^4 times more acidic

Answer:

Albedo affects the climate by controlling the amount of radiation a particular planet absorbs, weather can also depend on how much the earth absorbs radiation in case of the earth.

.

Answer: around 137.33

Explanation:

Answer: Your answer is J

Explanation: This can occur when moon is closest to earth.

So the moon in between earth and sun.

Also factually the moon can effect human behavior, because humans are made up of some percent of water.

Answer:

v = 15/2

Decimal Form:

v = 7.5

Mixed Number Form:

v = 7  1/2

Explanation:

Hope this helps!

Answer:

Explanation:

Answer:

A WAVE CARRIED THROUGH A ROPE

Explanation:

I chose a wave on water and got it WRONG

Answer:

Physical change

Explanation:

Cutting and freezing are both examples of physical changes that do not alter the chemical composition or properties of the object/substance.

Answer:

physical change

Explanation:

carrot lost its original shape

Answer:

Temporal lobes

Explanation: They are right above the ears...And they help us process sounds...They are also important for learning and memory, as well as the understanding of language

Answer:

Grignard reagents are formed by the reaction of magnesium metal with alkyl or alkenyl halides. They're extremely good nucleophiles, reacting with electrophiles such as carbonyl compounds

Explanation:

hope this helps!

Answer:

10 L of CO₂.

Explanation:

The balanced equation for the reaction is given below:

2CO + O₂ —> 2CO₂

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Finally, we shall determine the volume of CO₂ produced by the reaction of 10 L CO. This can be obtained as follow:

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Therefore, 10 L of CO will also react to produce 10 L of CO₂.

Thus, 10 L of CO₂ were obtained from the reaction.

10L of carbon dioxide will be produced from 10L of carbon monoxide.

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Answer:

A oxygen

Explanation:

For plant growth nitrogen, potassium and phosphorous are the three main elements needed. oxygen is expelled from plants. Plants doesn't need oxygen

Answer:

Liquids and gases flow easily because their particles can move or slide past one another.

Explanation:

Hope this helped Mark BRAINLEST!!

Answer:

Yes

Explanation:

There are 2 energy forms which one can transfer to and or from. An objects energy can be converted from one form to another.

Answer: 1.5 moles/L

Explanation:

Molarity = moles/ Liters

to find the molarity of BaO: 3moles/2L = 1.5 moles/L

Answer:

Yes, a chemical reaction has occurred

Explanation:

A chemical change is known to lead to the appearance of a new substance. Another name for chemical change is chemical reaction.

The new substance is formed when the bonds in the reactants are being rearranged to yield the products of the reaction.

In this case, two clear liquids were mixed and the contents of the system interacted briefly to yield a new product which appears as the white powder suspended in a clear,  colorless liquid.

Answer:

1.03 mol of dihydrogen gas will evolve, with a volume slightly over

22.4 [tex]dm^{3}[/tex] at STP.

Explanation:

Answer:

84% yield

42/50 = 0.84 = 84%

Answer:

A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and accelerated rate calorimeters are among the most common types.

Explanation:

Explanation:

An apparatus for measuring the heat generated or absorbed by either a chemical reaction, change of phase or some other physical change is a calorimeter.

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Answer:

Mass ratio:

a. Approximately [tex]51.2\%[/tex].

b. Approximately [tex]35.3\%[/tex].

c. Approximately [tex]43.2\%[/tex].

Explanation:

Look up the relative atomic mass of each element on a modern periodic table:

For example, the relative atomic mass of [tex]\rm Al[/tex] is [tex]26.982[/tex]. Hence, the mass of one mole of [tex]\rm Al\![/tex] atoms would be (approximately) [tex]26.982\; \rm g[/tex].

Calculate the formula mass of [tex]\rm H_2O[/tex]:

[tex]\begin{aligned} & M({\rm H_2O}) \\ &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the formula mass for each of the hydrates:

[tex]\begin{aligned}& M({\rm MgSO_4 \cdot {7\, H_2O}}) \\ &= 24.305 + 32.06 + 4 \times 15.999 \\ & \quad\quad + 7 \times (2 \times 1.008 + 15.999) \\ &= 246.466\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm LiC_2H_3O_2 \cdot {2\, H_2O}}) \\ &= 6.94 + 2 \times 12.011 + 3 \times 1.008 + 2 \times 15.999 \\ & \quad\quad + 2 \times (2 \times 1.008 + 15.999) \\ &= 102.014\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm Al(NO_3)_3 \cdot {9\, H_2O}}) \\ &= 26.982 + 3 \times (14.007 + 3 \time 15.999) \\ &\quad \quad + 9 \times (2 \times 1.008 + 15.999) \\ &= 375.129\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

The mass of [tex]1\; \rm mol[/tex] of [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units is [tex]246.466\; \rm g[/tex].

There are seven mole of [tex]\rm H_2O[/tex] formula units in that many [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units. The mass of that [tex]7\; \rm mol[/tex] of [tex]\rm H_2O\![/tex] formula units would be [tex]7 \; \rm mol \times 18.015\; \rm g \cdot mol^{-1} = 127.105\; \rm g[/tex].

Hence, the percentage mass of [tex]\rm H_2O[/tex] in [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] would be:

[tex]\begin{aligned}\frac{127.015\; \rm g}{246.466\; \rm g} \approx 51.2\%\end{aligned}[/tex].

Similarly:

In an ecosystem it is a bad idea to plant 100 seeds in your plant experiment as there would be competition for resources among the seeds.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

Learn more about ecosystem,here:

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Answer:

Maybe you could do something with nuclear power plants and how we use those to create electrical energy for our phones, houses etc?