How much 3m stock solution would it take to make 70 ml of 1.2 m solution?

40 g glucose

Explanation:

I have to assume that you are asking about a 2% m/v solution ( Note that specifying 2% in isolation has no meaning )

2% m/v glucose solution is : 2 g glucose in 100 mL solution

Which is ( multiply by 10): 2% m/v = 20 g glucose in 1000 mL ( = 1.0 L) solution

And so 2%m/v = 40 g glucose in 2000 mL or 2.0 L solution

Answer: 40 g glucose.

Answer:

What is the main problem with windmills?

Image result for Guided Practice Old-fashioned windmills are not aerogenerators because

As with all energy supply options, wind energy can have adverse environmental impacts, including the potential to reduce, fragment, or degrade habitat for wildlife, fish, and plants. Furthermore, spinning turbine blades can pose a threat to flying wildlife like birds and bats.

Why are the windmills not moving?

Why do the turbines not spin at times? The most common reason that turbines stop spinning is because the wind is not blowing fast enough. Most wind turbines need a sustained wind speed of 9 MPH or higher to operate. Technicians will also stop turbines to perform routine maintenance or repairs.

All the given species have the same charge except peroxide.

Thus, only peroxide is unique.

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Answer:

more rounded the grains are the more they have been moved around

Explanation:

Generally – the more rounded the grains are the more they have been moved around (i.e. the longer the length of time or distance they have moved). Angular grains cannot have travelled far

geolsoc.org.uk

Answer:

1.788 C DEGREES

Explanation:

STP is 1 atm at  273.15 K

P1V1/T1  = P2V2/T2

(1)(62.65) / (273.15) = (612/760)(78.31)/T2

T2 = 274.93 K     = 1.788 C

Answer: 2Na3 (s)-> 2Na (s) +3N2 (g)

Explanation:

look at the keywords then balance equation

Answer:

ywhehehehehdgdudcdudcd uy dshdcvv

Explanation:

bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs

When comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.

In an electrolytic cell, the reaction is non-spontaneous so it requires some input of energy for it to function while for a voltaic cell, the reaction is spontaneous.

Oxidation occurs at the anode and reduction occurs at the cathode.

Thus, when comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.

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Answer:

The solution has a pH value of 9.3.

Explanation:

To solve this problem, we can first determine the H+ ion concentration and then use this value to calculate the pH. To find the H+ ion concentration from the OH- ion concentration, we should use Kw, which we know has a value of 1 * 10^(-14).

We can then use the following formula to solve for [H+]:

Kw = [H+][OH-]

10^(-14) = (2.02 * 10^(-5)) * [H+]

[H+] = 4.950495 * 10^(-10)

Now, we can find the pH using the formula pH = -log[H+].

pH = - log[H+]

pH = - log(4.950495 * 10^(-10))

pH = 9.3

Therefore, the correct answer is that the pH of the solution is 9.3. Note that an alternative way to solve the problem is to find the pOH from the OH- ion concentration and use the resulting value to determine the pH that way instead.

Hope this helps!

Answer:

no

Explanation:To help you know the difference change it into a percentage, by moving the decimal two places to the right. That would give you 271% and 800% would you rather get a 271% or a 800% on a test? You would want to get an 800% because it’s a bigger number.

Answer:

455 Kcal

Explanation:

2Cl2(g) + 7O2(g) + 130kcal → 2Cl2O7(g)

Rearranging we get,

2Cl2(g) + 7O2(g)  → 2Cl2O7(g) Δ H = 130 kcal . mol⁻¹

So for per mol reaction will be as above.

In case of 7 mols of product, we need 7/2 mole ratio x 130 = 455 Kcal

The mass of  2.75 ×   [tex]10^{-4}[/tex]moles NaOH will be 1.1 x  [tex]10^{-2}[/tex] grams

Recall that:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, the mole is  2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.

Mass =  2.75 ×  [tex]10^{-4}[/tex]x 40 = 1.1 x  [tex]10^{-2}[/tex] grams

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Answer:

Answer is option B or:

1.10 x 10–2 g NaOH

Explanation:

hope this helps! (edge)

Answer:

D

Explanation:

The weak crust of the earth does not hold together as well as strong crust.

Answer:

A and B was right in our test.

Explanation:

A was: A volcano can suddenly get taller every time it erupts

B was: Hot magma from inside Earth is released at weak points in the crust.

Answer:

cu2 is 5he correct answer

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

Substances are either chemical elements or compounds.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself.

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

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A solution of the ionic salt CaSO₃ would have an acidic pH.

This is referred to power of hydrogen and it measures the degree of acidity or alkalinity of a substance.

CaSO₃  which is referred to as calcium sulfite or calcium salt is formed through the reaction below and has a pH of 6 thereby making it an acidic salt.

SO₂ + CaCO₃ → CaSO₃ + CO₂

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Answer:

Basic

Explanation:

acellus

Answer:

Reaction 2

Explanation:

12/30=0.4g/sec

200/(8*60)=0.41667g/sec

Answer:

The slope of the trend line is 2.55; as the temperture.

Explanation:

Answer:

749 grams CO₂

Explanation:

To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.

Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)

Molar Mass (C₃H₈): 44.094 g/mol

1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O

Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)

Molar Mass (CO₂): 44.01 g/mol

250. g C₃H₈         1 mole C₃H₈           3 moles CO₂              44.01 g
------------------  x  ----------------------  x  ----------------------  x  --------------------  =
                               44.094 g              1 mole C₃H₈            1 mole CO₂

= 749 grams CO₂

The Antoine's law means that the amount of substance before reaction must be equal the amount of substance after reaction

The equation h2 + cl2 ---> 2hcl correctly models this law.

Answer: [tex]0.654 \text{ J/g} \cdot ^{\circ}\text{C}}[/tex]

Explanation:

[tex]678=(34.57)(c)(55.0-25.0)\\\\c=\frac{678}{34.57(55.0-25.0)} \approx \boxed{0.654 \text{ J/g} \cdot ^{\circ}\text{C}}}[/tex]

Gamma decay is a type of radioactive decay that does not change the identity of the isotope.

During gamma decay the nucleus emits radiation without actually changing its composition. In this type of decay only energy is released but the structure is same.

So we can conclude that gamma decay is a type of radioactive decay that does not change the identity of the isotope.

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Answer: 0.1 M

Explanation:

Originally, [tex]0.500=\frac{\text{moles of solute}}{0.002}[/tex], so there was 0.001 mol of KOH.

Now, there is 8.0+2.0=10.0 mL of solution, so the new concentration is:

[tex]\frac{0.001}{0.01}=\boxed{0.1 \text{ M}}[/tex]

Answer:

um Im not sure what the heck that is

Taking into account the definition of calorimetry, the mass of water is 35.70 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

For granite:

For water:

Replacing in the expression to calculate heat exchanges:

For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex]  × 126.1 g× (51.9 °C - 92.6 °C)

For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qgranite = + Qwater

- 0.795 [tex]\frac{J}{gC}[/tex]  × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)

Solving:

4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C

4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water

mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]

mass of water= 35.70 grams

Finally, the mass of water is 35.70 grams.

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(I know this is late so hopefully other people find it helpful)

Answer: Solid Cu  

Since this is a voltaic cell:

Copper is the cathode, therefore having a positive charge.

Zinc is the anode, therefore having a negative charge.

(Also, I took the exam and it's correct; good luck everyone!)

Answer: 2 moles

Explanation:

We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)

So, the answer is 2 moles.

Answer:

D.

Explanation:

This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.