Which describes a value for density?

Every burette reading must have two decimal places, with the second number being either 0 or 5. A percentage error of 0.2% is produced for each reading by a one-drop mistake in a volume of 25.00 cm3. You could attempt to put the measurements and methods together.

In terms of percentage, relative uncertainty equals x x 100. If we know the relative uncertainty, we may use the formula absolute uncertainty = relative uncertainty 100 measured value to determine the absolute uncertainty. As a result, the uncertainty of the mass measurement and the uncertainty of the density determination affect the uncertainty of the volume, which means that the factors determining the uncertainty accumulate as each physical quantity is measured.

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Answer:

Fractional distillation

Explanation:

Answer:

A

Explanation:

because they have 1 process

[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]

Here's what we observed in the following two scenarios :

When the mixture of salt and sand is placed in a beaker, they form a heterogeneous mixture, and it is a bit troublesome to separate those two

But when water is added to the mixture, salt gets dissolved in it, whereas sand doesn't and it settles down with time, amd here we can easily separate sand and salt mixture, we just need to take out the water when sand has settled and just heat it to get salt back.

Answer:

D. 1.48atm

Explanation:

Van der waals equation is given as:

(P +an²/v²) (v - nb) = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latm/molK)

a and b = gas constant specific to each gas

T = temperature (K)

n = number of moles

According to the given information; V = 22.4L, T = 0.00°C (273.15K), R = 0.0821 Latm/molK, a = 6.49L^2-atm/mol^2, b = 0.0562 L/mol, n = 1.5mol

Hence;

(P + 6.49 × 1.5²/22.4²) (22.4 - 1.5×0.0562) = 1.5 × 0.0821 × 273.15

(P + 6.49 × 2.25/501.76) (22.4 - 0.0843) = 33.638

(P + 0.0291) (22.316) = 33.638

22.316P + 0.649 = 33.638

22.316P = 33.638 - 0.649

22.316P = 32.989

P = 32.989/22.316

P = 1.478

P = 1.48atm

Answer:

The correct answer is 0.373 M.

Explanation:

The reaction will be,

H3PO4 (aq) + 3KOH (aq) ⇔ 3H2O (l) + K3PO4 (aq)

Based on the given information, the molarity of the solution KOH is 0.100 M, the volume of the solution given is 112 ml or 0.112 L.

The molarity of the solution with respect to KOH is,

M = Moles/Volume of Solution (liters)

Moles of solute = Molarity * Volume of solution

Moles = 0.100 M * 0.112 L

= 0.0112 moles

From the reaction it is clear that 3 moles of KOH needed 1 mole of H3PO4, thus, 0.0112 moles of KOH will require,

1/3 * 0.0112 = 0.00373 moles of H3PO4

The volume of the H3PO4 solution is 10 ml or 0.01 L.

The molarity of the solution will be,

M = Moles/ Volume of Solution (liters)

M = 0.00373/0.01 = 0.373 M

Thus, the concentration of the solution is 0.373 M.

The concentration of the H3PO4 would be 0.37 M

Going by the balanced equation of the reaction:

[tex]3KOH + H_3PO_4 ---> 3H_2O + K_3PO_4[/tex]

The mole ratio of KOH to H3PO4 is 3:1.

Using the equation: CaVa/CbVb = 1/3

What we are looking for is Ca:

Ca = CbVb/3Va

              = 0.1 x 112/3 x 10

                 = 0.37 M

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Answer:

45460.9

Explanation:

Answer:

37854.12

Explanation:

for every 1 US gallon there is 3.78541 liters. So if there is 10,000 gallons, you would multiply 3.78541 by 10,000.

The answer to the above question is B.

The following chemical reaction KOH + HCl → KCl + H2O is a type of single replacement reaction and the salt is Pottasium chloride.

A single replacement reaction is a type of reaction that involves the substitution of one element in a compound with another.

The following reaction is given in this question;

KOH + HCl → KCl + H2O

Pottasium displaces hydrogen in this equation to form pottasium chloride salt. Therefore, it is a type of single replacement reaction.

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The correct statement : The atomic number of the radioactive nuclide is 90.

In the following element notation,

[tex]\large {{{A} \atop {Z}} \right X}[/tex]

X = symbol of elemental atom

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

The symbol for a radioactive nuclide :

[tex]\tt ^{234}_{90}Th[/tex]

atomic number  = 90

mass number  = 234

number of neutrons = 234-90=144

number of protons = atomic number = 90

Answer:

A on EDG

Explanation:

Answer:

2C2H6 + 7O2 → 4CO2 + 6H2O

Explanation:

First off you find them by balancing the equation ( equal amounts of elements on both sides) So add a two infront of the C2H6. Now you have 4 Carbons and 12 Hydrogens on the left aswell as 2 oxygens.

Now go to the right side and put a 4 infront of CO2 and a 6 infront of H2O. You now have 4 carbons 12 hydrogens and 14 oxygens on the right side.

Finally go back to the let side and place a 7 infront to make the left have 14 oxygens just like in the right. A trick to use is to save the coefficients with only one element till the end so you can do less work in the long run.

But i hope this helped its balanced and down to the smallest whole numbers possible most teachers want whole numbers as the coefficient.

These are tricky at first but once you practice a bit you will be a pro.

Answer: true

Explanation: In this example, the processes (perceive, process, and respond), are done in a matter of milliseconds, but reaction time can vary depending on a variety of factors: Complexity of the stimulus-The more complex the stimulus, the more information that has to be processed, the longer this process will take.

Strontium ( Atomic Number 38 ) undergoes beta minus decay. Atomic mass of Strontium is 90 u. The given reaction shows the complete nuclear reaction of Strontium.

⁹⁰₃₈ Sr → ⁹⁰₃₇ Y + ⁰₋₁ β + ⁻∨ₑ

Beta particle β is a high speed electron. Whenever Strontium undergoes beta minus decay, the neutron located inside its nucleus gets converted into proton. During the same reaction, a beta particle and electron antineutrino are also being released or emitted.

In the nuclear reaction ( Beta minus decay ) of Strontium, mass and charge are conserved. 

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Answer:

2.64g of CO₂ are produced

Explanation:

The reaction of hexane with O₂ is:

C₆H₁₄ + 19/2O₂ → 6CO₂ + 7H₂O

To solve this question, we must convert each mass of reactant to moles in order to find limiting reactant and, with the chemical reaction we can find the moles of carbon dioxide produced and the maximum mass produced:

Moles hexane -Molar mass: 86.18g/mol-:

0.862g * (1mol / 86.18g) = 0.01 moles

Moles Oxygen -Molar mass: 32g/mol-:

5.1g * (1mol / 32g) = 0.16 moles

For a complete reaction of 0.01 moles of hexane there are required:

0.01moles hexane * (19/2 Oxygen / 1mol Hexane) = 0.095 moles oxygen

As there are 0.16moles, limiting reactant is hexane.

0.01 moles of hexane produce:

0.01 moles * (6 moles carbon dioxide / 1 mole hexane) = 0.06 moles of CO₂.

The mass is -Molar mass CO₂: 44g/mol-:

0.06 moles of CO₂ * (44g/mol) =

Answer:

Charles's law

Explanation:

The expression:

     V1/T1 = V2/T2

represents Charles's law

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

 So,

    V1/T1 = V2/T2

Pressure and the number of moles are constant

V and T are the volume and temperature

1 and 2 are the initial and final states.

Answer:

charle's law

Explanation:

Answer:

[tex]\boxed {\boxed {\sf C. \ Lead-204}}[/tex]

Explanation:

One way of writing an isotope is hyphen notation or:

We know the mass number (protons and neutrons) is 204. We can automatically eliminate choices A and C, because they claim the mass number is 82.

Now we must find the element name. We know the atomic number or number of protons is 82. Look on the periodic table for the element with atomic number 82, which is lead.

Therefore,

The isotope notation in hyphen notation is: Lead-204

Answer:

No, it will not exist in real life

Explanation:

Let us consider the electronic configuration of magnesium; Ne 3s2

We must also assume that the compound Mg20 is ionic. If this is the case, then it involve Mg+ and O^2-.

The electronic configuration of Mg+ is Ne 3s1. We can see that this specie has not yet attained a stable noble gas configuration, As a result of this, the ion is not stable. Hence, Mg20 does not occur in real life,

Answer:

titanium

Explanation:

according to my knowledge titanium is more expensive than diamonds....A country becomes powerfull by having more quantity of titanium....all the bombs, nuclear weapons and nuclear enegry are made from titanium so it is expensive and powerfull too..

Answer:

The correct answer is 1.10.

Explanation:

Based on the given information, the molarity of the NaOH is 0.15 M, that is, 0.15 moles per liter of the solution.

Now the moles present in the 15 ml of the solution will be,  

0.015 × 0.15 = 2.25 × 10⁻³ moles of NaOH or 0.0025 moles of NaOH

Now, molarity of the HNO₃ given is 0.20 M, which means 0.2 moles per liter of the solution.  

Now the moles present in the 30 ml of the solution will be,  

0.030 × 0.2 = 0.006 moles of HNO₃

Now the complete disintegration of acid and base will be,  

NaOH (aq) (0.025 moles) ⇔ Na⁺ (aq) (0.025) + OH⁻ (aq) (0.025 moles)

HNO₃ (aq) (0.006 moles) ⇔ H⁺ (0.006 moles) + NO₃⁻ (aq) (0.006 moles)

Now the additional Hydrogen ions at titration point is,  

= 0.006 - 0.0025 = 0.0035 moles of H+

Now the concentration of H+ ions in the 45 ml of the solution will be,  

= 0.0035/45 × 1000

= 0.078 M

pH = -log[H⁺] = -log [0.078]

= 1.10

A. Cytoplasm is the correct answer!

Answer:

Flask d

Explanation:

I promise u it’s flask d

Answer: 3 moles of HCl

Explanation: let’s do a balanced chemical equation

Al(OH)3 + 3HCl —> AlCl3 + 3H2O

We see that for every 1 mole of Al(OH)3 we need 3 moles of HCl

Answer:

yes that is true........

Answer:

1.204 x 10²⁴ atoms of oxygen in 1 mole of CO₂

Explanation:

1 mole of CO₂ contains 6.02 x 10²³ molecules of CO₂

1 molecule of CO₂ contains 2 atoms of oxygen

Therefore, Atoms of oxygen in 1 mole of CO2 => 6.02 x 10²³ molecules CO₂  x

2 atoms oxygen / molecule CO₂ = 2  X  6.02 X10²³ atoms of oxygen = 1.204x10²⁴ atoms of oxygen in 1 mole CO₂

Answer:

a. 5.39 atm

Explanation:

Pressure = ?

Volume = 1 L

Temperature = 298 K

Mass = 9.70g

The formular relating these variables is the ideal gas equation;

PV = nRT

where R = gas constant = 0.082057 L.atm.K-1.mol-1

n can be obtained from the formular below;

n = mass / molar mass = 9.70 / 44

n = 0.2205 mol

P = nRT / V

P = 0.2205 * 0.082057 * 298 / 1

P = 5.392 atm

The correct option is option A.

Answer:

Copper and silver are the best conductors, but gold connections outlast both of them because they do not tarnish. It is not that the gold lasts longer, but that it remains conductive for a longer time. Gold is ductile: It can be drawn out into the thinnest wire.

Explanation:

Answer:

Synthesis

Explanation:

Answer:

Mass of reactant and mass of product must be equal.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

One reason could be that the compound prevented cells from mutating. The correct option is D.

Any drug that is effective in the treatment of malignant, or cancerous, disease is referred to as an anticancer drug.

Anticancer drugs are classified into several categories, including alkylating agents, antimetabolites, natural products, and hormones.

Chemotherapy, also known as chemotherapy or anticancer medication, is a type of medication used to destroy, kill, shrink, or slow the growth of cancer cells.

As after the treatment, the researchers noticed that the culture had stopped growing, it can be possible that it prevented new mutation.

Thus, the correct option is D.

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Your question seems incomplete, the missing options are:

A. The compound has degraded

B. The compound had no effect

C. The compound killed the treated cell

D. The compound prevented cells from mutating

Answer:

1. MG

2. N

3. F

4. NA

5. O

6. K

Answer:

Largest to Smallest: Na, K, Mg, N, O, F

Explanation: