Fill in the blank.
5.22x10^-3 = [? ]x 10^-2

Answer: 1×10^11

Explanation:

concept to know: scientific notation must be written in the form of a × 10^b

where 0<a<10.

100 billion= 100,000,000,000

there are 11 zeros after 1

1 × 10^11

Hope this helps!! :)

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]Density = \frac{mass}{volume} [/tex]

From the question

mass = 52 g

volume = 26 mL

Substitute the values into the above formula and solve for the density

That's

[tex]Density = \frac{52}{26} [/tex]

We have the final answer as

Hope this helps you

Explanation:

for immiscible liquids it is quite easy to separate and the separating funnel can be used but for miscible liquid they form a single entity and separating them is quite impossible if the differences in temperature is not considered,so in distillation the one with lower boiling point evaporates out living behind the one with high boiling point

Answer:

92.72 kJ

Explanation:

2 N₂ (g) + O₂ (g) —-> 2 N₂O

According to question , one mole of N₂O requires 163.2 kJ of heat

Molecular weight of N₂O = 44 gm

25 g  N₂O = 25 / 44 mole

25 / 44 mole will require 163.2 x 25 / 44 kJ

= 92.72 kJ

Answer:

Explanation:

Since the mass of NaCl and it's volume has been given we can find the molarity by using the formula

where

C is the molarity

m is the mass

M is the molar mass

v is the volume

From the question

v = 0.5 L

m = 205 g

We must first find the molar mass and then substitute the values into the above formula

M( Na) = 23 , M( Cl) = 35.5

Molar mass of NaCl = 23 + 35.5 =

58.5 g/mol

So the molarity of NaCl is

[tex]C = \frac{205}{0.5 \times 58.5} \\ C = \frac{205}{29.25} [/tex]

C = 7.00854

We have the final answer as

Hope this helps you

Answer:

115g

Explanation:

100*8=800

800+150+200=1150

1150/10=115

Answer:

[tex][base]=0.28M[/tex]

Explanation:

Hello,

In this case, by using the Henderson-Hasselbach equation one can compute the concentration of acetate, which acts as the base, as shown below:

[tex]pH=pKa+log(\frac{[base]}{[acid]} )\\\\\frac{[base]}{[acid]}=10^{pH-pKa}\\\\\frac{[base]}{[acid]}=10^{4.9-4.76}\\\\\frac{[base]}{[acid]}=1.38\\\\[/tex]

[tex][base]=1.38[acid]=1.38*0.20M=0.28M[/tex]

Regards.

Answer:

[tex]15141.7\frac{in}{min}[/tex]

Explanation:

Hello,

In this case, by knowing that one inch equals 2.54 centimetres and 1 minute equals 60 seconds, the required velocity in inches per minute turns out:

[tex]641\frac{cm}{s}*\frac{1in}{2.54cm}*\frac{60s}{1min}}\\\\15141.7\frac{in}{min}[/tex]

Best regards.

Answer:

it turns red in colour.

Explanation:

Answer:

Yes Scientific ideas change over time as our evidence improves.

Explanation:

A scientific idea is an explanation for how something works, or the truth about some aspect of the world, that was figured out using the scientific process. ... Scientific ideas change over time as our evidence improves. The more experiments we do, and the more data we collect, the better our scientific ideas become.

Answer:

Yes scientific ideas can change...That's why they are called ideas so it may be right or wrong... ideas are just guesses that you consider may work or not.... I hope this helps you

Answer:

Explanation:

Hello,

In this case, considering the given specific gravity we are to compute the density of the 64% HNO3 solution:

[tex]\rho=1.24*1g/mL=1.24g/mL[/tex]

In such a way, since the given solution of nitric acid is 64 % by mass, we've got:

[tex]\frac{64gHNO_3}{100g\ solution}[/tex]

Thus, by using the previously computed density and the molar mass of HA (90.2 g/mol) we can compute the required molar concentration as follows:

[tex]M=\frac{(100g-64g)HA}{100g\ solution}*\frac{1.24g\ solution }{1mL \ solution}*\frac{1000mL\ solution}{1L\ solution}*\frac{1molHA}{90.2gHA} \\\\M=4.95M[/tex]

Regards.

Answer:

London forces only

Explanation:

Dimethyl ether is a nonpolar organic compound. Remember that for nonpolar organic substances, London forces are the primary intermolecular forces present.

Since dimethyl ether is a nonpolar organic compound, then it has London forces as its major intermolecular force. Intermolecular forces hold molecules of a substance together in a given state of matter.

Answer:

False

Explanation:

Hello,

In this case, it is possible to substantiate that the statement is false, since the entropy of sucrose is greater than the entropy of ribose due to the fact that molar mass of the sucrose (342 g/mol) is greater than the molar mass of ribose (150 g/mol) and the general rule states that the greater the molar mass the greater the entropy.

Best regards.

Answer:

Explanation:

The pH of the solution can be found by using the formula

pH = - log [H+]

From the question

[H+] = 10^-5 M

Substitute the value into the above formula and solve for the pH

That's

[tex]pH = - log( {10}^{ - 5} ) [/tex]

We have the final answer as

pH = 5

Hope this helps you

Answer:

1- d= m/v  d=540/200 d=2,7 g/cm

Explanation:

Answer:

BELOW

Explanation:

[tex]Density = \frac{Mass}{Volume}\\ \\D=?\\mass = 5.5g\\volume = 4.10\\\\D = \frac{5.5}{4.10} \\\\Density = 1.34[/tex]

Answer:

You must add 13.86g of I₂

Explanation:

In the reaction:

5 P₄O₆ + 8I₂ → 4P₂I₄ + 3P₄O₁₀

5 moles of P₄O₆ reacts with 8 moles of I₂.

First, we need to determine how many moles of I₂ reacts completely with 7.15g of P₄O₆ (Molar mass: 219.88g/mol, thus:

7.15g P₄O₆ * (1mol / 219.88g) = 0.0325 moles P₄O₆.

Using the chemical reaction, the moles of I₂ that reacts are:

0.0325 moles P₄O₆ * ( 8 moles I₂ / 5 moles P₄O₆) = 0.0520 moles of I₂ react completely.

As molar mass of I₂ is 253.81g/mol, the mass of I₂ that reacts completely is:

0.0520 moles of I₂ * (253.81g / mol) =

13.2g of I₂.

As you must add 5.00% of excess:

13.2g + 5%13.2g =

You must add 13.86g of I₂

Answer: 2.652882206 but it depends on how you round it so I would say 2.65 or 2.7 g/mL

Explanation: Density is mass divided by volume

Liters and millilitres are the most common units of volume.

The volume equal to a gallon of gasoline is 3785 m L which is equal to 3.785 L.

The volume equal to pint of milk is 473...

A a cup of water is 0.24 L

Answer:

more rapid

Explanation:

A higher temperature of fresh concrete results in a more rapid hydration of cement. This causes reduction in the setting time of the cement, also known as accelerated setting of the cement.

It also reduces the workability of the concrete; as it makes the movement of aggregates harder by reducing the lubricating effect of the cement.

Answer:

No.

Explanation:

Graduated cylinder is an instrument in chemistry used to measure approximate volumes of liquids. But you can't make volumetric analysis with these instruments because are not accurate as enough.

In chemistry, the measure of a sample must be accurate because you work with a sample to know which sample is and which is its purity. For that reaseon, graduated cylinder in not appropriate to measure 1.0mL of a sample. You must use PIPETTES.

Answer:

4.83 km

Explanation:

Let's consider the following subtraction.

4.910 km - 0.08 km

For an addition or a subtraction, the rule for significant figures is as follows: limit the reported answer to the rightmost column that all numbers have significant figures in common, in this case, 2 figures after the decimal point.

4.910 km - 0.08 km = 4.83 km

Answer:

The Earth is divided into two halves by the prime meridian, forming two half spheres divided vertically. The Earth is also divided into two halves by the equator, creating two half spheres divided horizontally.

Explanation:

I took it on edge ( :

Answer:

3.9 L of H2.

Explanation:

We'll begin by calculating the number of mole in 2.82 g of aluminium, Al.

This is illustrated below:

Mass of Al = 2.82 g

Molar mass of Al = 27 g/mol

Mole of Al =?

Mole = mass /Molar mass

Mole of Al = 2.82 / 27

Mole of Al = 0.104 mole

Next, we shall write the balanced equation for the reaction. This is given below:

2Al + 6HCI —> 2AlCl3 + 3H2

From the balanced equation above,

2 moles of Al reacted with 6 moles of HCl to produce 3 moles of H2.

Next, we shall determine the number of mole H2 produced by reacting 0.104 mole of Al.

This is illustrated below:

From the balanced equation above,

2 moles of Al reacted to produce 3 moles of H2.

Therefore, 0.104 mole of Al will react to produce = (0.104 x 3)/2 = 0.156 mole of H2.

Therefore, 0.156 mole of H2 was produced from the reaction.

Finally, we shall determine the volume of H2 produced by using the ideal gas equation as shown below:

Number of mole (n) of H2 = 0.156 mole

Pressure (P) = 769 torr = 769/760 = 1.01 atm

Temperature (T) = 35°C = 35°C + 273 = 308 K

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) of H2 =?

PV = nRT

1.01 x V = 0.156 x 0.0821 x 308

Divide both side by 1.01

V = (0.156 x 0.0821 x 308) /1.01

V = 3.9 L

Therefore, 3.9 L of H2 were produced from the reaction.

Answer:

HCl

Explanation:

The best solvent for NaF is a polar liquid. The only liquid having a significant dipole moment among the options is HCl due to the large electro negativity difference between hydrogen and chlorine.

The polar solvent can interact with the NaF via its dipoles such that the NaF dissolves due to ion-dipole interaction.

Answer: ΔH°f of gaseous nitrogen monoxide is 148.0 kJ/mol

Explanation:

The balanced chemical reaction is,

[tex]NO(g)+\frac{1}{2}O_2(g)\rightarrow NO_2(g)[/tex]

The expression for enthalpy change is,

[tex]\Delta H_{rxn}=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]

[tex]\Delta H_{rxn}=[(n_{NO_2}\times \Delta H_f_{NO_2})]-[(n_{O_2}\times \Delta H_f_{O_2})+(n_{NO}\times \Delta H_f_{NO})][/tex]

where,

n = number of moles

[tex]\Delta H_{O_2}=0[/tex] (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

[tex]-114.14=[(1\times 33.90)]-[(\frac{1}{2}\times 0)+(1\times \Delta H_f{NO})][/tex]

[tex]\Delta H_f{NO}=148.0kJ/mol[/tex]

Therefore, ΔH°f of gaseous nitrogen monoxide is 148.0 kJ/mol

Answer:

The rate of reaction is unchanged

Explanation:

The rate of reaction of tertiary alkyl halides with a nucleophile is independent of the nucleopohile concentration but depends only on the initial concentration of the alkyl halide since tertiary alkyl halides reacts via SN1 mechanism.

The nucleophile concentration does not come into the rate equation for the reaction hence any change in its concentration is inconsequential in determining the overall rate of reaction, hence the rate of reaction is unchanged when the nucleophile concentration is halved.

Answer:

Electrons occupy orbitals with the lowest energy first.

Explanation:

The Aufbau Principle states that electrons will fill the atomic orbitals with the lowest energy levels first, before occupying others with higher energy levels.

For example, electrons will fill the 1s orbital before filling the 2s orbital.

Answer:

It is Filled sublevels are more stable than partially filled sublevels.

Explanation:

Just took the test and this was right.

Answer:

i try to solve it for you, and i aplode a similer question for you

Explanation:

Answer:

A

Explanation:

The measurement represents the largest quantity among the given options is 47.3 mg Hence, Option (A) is correct.

An arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.

Therefore comparing all the four options it can be concluded that,The measurement represents the largest quantity among the given options is 47.3 mg Hence, Option (A) is correct.

Learn more about measurement here ;

https://brainly.com/question/18147632

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