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morpeh [17]
4 years ago
7

BRAINLIEST ANSER!!!! PLZZ HELP MEEE!

Chemistry
2 answers:
butalik [34]4 years ago
5 0
Grass is your answer

Orlov [11]4 years ago
3 0
It is A. grass. Hope this helps!
You might be interested in
When an irregular shaped object was put in a graduated cylinder with an initial volume of 25 mL of water, the water level rose t
alexandr402 [8]

Answer:

0.24 g/mL

Explanation:

The density of an object is given by the ratio between its mass and its volume:

\rho=\frac{m}{V}

where

m is the mass of the object

V is its density

In this problem, we have:

m = 7.0 g is the mass of the object

The volume of an irregular shaped object can be measured by putting it into water, and by measuring the difference in water volume.

In this case,

V_1=25 mL is the initial volume of water

V_2=54 mL is the final volume of water

So the volume of the object is

V=V_2-V_1=54-25=29 mL

Therefore, the density of the object is:

\rho = \frac{7.0 g}{29 mL}=0.24 g/mL

7 0
3 years ago
Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. What volume of water would be produced by this reac
AlladinOne [14]

Answer: 3.4 L

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given Volume}}{\text {Molar Volume}}=\frac{6.5L}{22.4L}=0.29moles

The balanced chemical equation for reaction of Hydrogen chloride gas with oxygen to form water vapor and chlorine gas.

4HCl(g)+O_2(g)\rightarrow 2H_2O(g)+2Cl_2(g)

According to stoichiometry :

4 moles of HCl produce = 2 moles of H_2O

Thus 0.29 moles of HCl will produce =\frac{2}{4}\times 0.29=0.15moles  of H_2O

Volume of H_2O=moles\times {\text {Molar Volume}}=0.15moles\times 22.4L/mol=3.4L

Thus 3.4 L of of water would be produced by this reaction if 6.5 L of hydrogen chloride were consumed

4 0
3 years ago
Which statements describe homologous structures? Check all that apply. An example of a homologous structure is the wing of a bir
denis23 [38]
<span>An example of a homologous structure is the forelimb of a whale, a human, and a dog. Homologous structures have the same structure, but may have a different function. Homologous structures indicate a common ancestor. A homologous structure is an organ or bone that's in common between different animals that demonstrates an anatomical commonality indicating that the animals share a common ancestor. This is in contrast to analogous structures where two unrelated animals have structures with similar forms or functions due to convergent evolution. With that in mind, let's look at the available options and see what fits. An example of a homologous structure is the wing of a bird and an insect. * This is an example of an analogous structure, so this is a bad choice. An example of a homologous structure is the forelimb of a whale, a human, and a dog. * Exactly. This is a good example of a homologous structure, so this is a good choice. Homologous structures have the same function but a different structure. * False. This is a type of analogous structure. Homologous structures have the same structure, but may have a different function. * True. A homologous structure is a structure that was present in a common ancestor of different animals. Further evolution may have caused those animals to diverge and the common structure may now be used for different purposes. So this is a good choice. Homologous structures indicate a common ancestor. * Yes, by definition. Homologous structures do not indicate a common ancestor. * Since the previous option was true, this must be false, so a bad choice.</span>
8 0
4 years ago
Read 2 more answers
how many grams of nahco3 (fm84.007) must be added ro 4.00g of k2co3 (fm 138.206) to give a ph of 10.80 in 500ml of water​
Anna11 [10]

Answer:

0.804g of NaHCO₃ you must add

Explanation:

pKa of HCO₃⁻/CO₃²⁻ is 10.32.

It is possible to find pH of a buffer by using H-H equation, thus:

pH = pka + log [A⁻] / [HA]

<em>Where [HA] is concentration of acid (HCO₃⁻) and [A⁻] is concentration of conjugate acid (CO₃²⁻).</em>

Moles of CO₃²⁻ = K₂CO₃ are:

4.00g ₓ (1mol / 138.206g) = 0.0289 moles CO₃²⁻

Replacing:

10.80 = 10.32 + log [0.0289] / [HCO₃⁻]

[HCO₃⁻] = 0.009570 moles you need to add to obtain the desire pH

As molar mass of NaHCO₃ is 84.007g/mol, mass of NaHCO₃ is:

0.009570 moles ₓ (84.007g / mol) =

<h3>0.804g of NaHCO₃ you must add</h3>

6 0
3 years ago
Which of the following is true about volcanic eruptions?
Sergio039 [100]

Answer:

D. Volcanic eruptions act as constructive forces when lava builds up to form volcanoes and plateaus.

Explanation:

Volcanic eruptions brings lava to the surface. They are powerful constructive forces that builds the earth and adds new materials to the surface.

  • Molten rocks from within the earth reaches the surface.
  • They then build up and accumulate to form very interesting land masses.
  • A constructive force adds new materials to the earth.
  • Weathering is a destructive force.
  • One notable constructive force usually occurs along divergent margins.
  • The mid-oceanic ridge is a very fascinating example
3 0
3 years ago
Read 2 more answers
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