A student decided not to reweigh his erlenmeyer flask throughout the calibration lab. after a given trial, he shook leftover water out of his erlenmeyer flask by wrist action and assumed the mass of his flask was constant. then, he reused the flask for the next trial and so on. given this information, is this an example of random or systematic error? why?

The degree of unsaturation is 1, and the possible structures are propene and cyclopropane.

Because the compound doesn't contain any heteroatoms, the matter of calculating degrees of saturation is simply deducting the number of hydrogen atoms (6) from the one a three-carbon alkane would have (8) and dividing by two:
(8 - 6) / 2 = 1

Because a single degree of unsaturation means either a double bond or a ring, we can draw an example of each, sticking to the three-carbon formula. This way we end up with propene (double bond) and cyclopropane (ring).
In addition, these are the only structures possible for this molecular formula.

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The melting point of 2.0g sodium chloride is: 400C

The temperature at which an idealized pure substance can coexist in both its liquid and solid phases is known as its melting point. The temperature at which a substance transforms from a solid into a liquid is known as its melting point. Melting happens for a pure substance at a single temperature. The melting points published in the literature have all been measured at a pressure of 1 atm of air unless otherwise specified.

Given that,

The melting point of 4.0g sodium chloride=800C

Setting up a proportion:

4X = 800(2)

4X = 1600

X = [tex]\frac{1600}{4}[/tex]

X = 400

Therefore, the melting point of 2.0g sodium chloride is 400C.

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Answer:

C,D,E,F,H,I,J are all basic observable indicators of chemical change

Explanation:

Using the density, Aluminum is heavier than wood.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

V Al = V wood = 1 m³

ρ Al = 2.7 g/cc

ρ wood is less than 1 g/cc

The heavier object is represented by mass and also mass is proportional to the density. Hence,

m ~ ρ

In the same volume, aluminum density is greater than the wood density

ρ Al > ρ wood

m Al > m wood

Thus, Aluminum is heavier than wood

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1.67 mM is the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.

It is given that the km of enzyme is 5.0 mM.

Enzyme is a protein based molecule that increase the rate of the given chemical reaction.

The conncetion in the middle of substrate and rate of reaction is calculated by the Michaelis-Menten Equation.

V = Vmax[S] / Km + [S]

where, V is initial velocity Km is measure of affinity and S is substrate concentration.

V = 0.25 [5.0] / 1/4 [5.0]

V =1.67

We apply one quarter in the given equation and the answer would be 1.67 mM

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Answer:

Physical Properties of Hafnium Hafnium is a shiny and silvery metal exhibiting ductile features. It is usually resistant to corrosion and exhibits similar chemical properties to that of zirconium.

Atomic Mass: 178.49 g.mol −

1Atomic Number: 72Symbol: Hf

Answer:

6

Explanation:

2A is a molecule Argon bond. so, it's 1 + 2+ 3

2,259.675kj/mol

10.16g of pentane is burned in a calorimeter, 9.87kg of water are heated from 21.6(degree) to 33.7(degrees), the molar heat of reaction for carbon dioxide will be

From the above statement , we have found

pentane  C5H12 = 10.16g

H2O =  9.87kg

TI = 21.6°C             T2 = 33.7°C

C5H12+8O2=5CO2+6H2O

as per the reaction, one mole of pentane gives 5 mole of carbon dioxide

now:

molar heat of CO2 = ncΔt ,

here n is number of mole, c is specific heat, t is temperature

Q = 5 ×37.35× 12.1

Q= 2,259.675kj/mol

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The odd one of the aforementioned substances is mixture because it is not a pure substance.

A pure substance is a substance that has a fixed chemical composition. In chemistry, molecules, elements and compounds are all pure substances.

Molecules are pure substances and they contain one or more types of chemical elements i.e. two or more atoms held together by chemical bonds.

Compounds are substances formed by chemical bonding of two or more elements in definite proportions by mass.

Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means.

However, mixtures are substances made up of two or more substances that are not even in their chemical composition. Mixtures are impure substances.

Therefore, the odd one of the aforementioned substances is mixture because it is not a pure substance.

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According to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.

It is a control and support tool that shows a geometric design that presents the existing links and the level of correlation between variables and how one variable influences another.

In this sense, given that it is a tool or graphic representation it is widely used in statistics, that helps to identify the possible association between two related sets of data, it seeks to correlate said variables in order to better control the process and improve it.

Therefore, we can conclude that according to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.

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The structure of the rock deep underground determined by some theory by the scientists.

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Answer:

H20

Explanation:

Answer:

H20

Explanation:

Two hydrogen and 1 oxygen

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When a cell from solution b is placed in solution a, water will enter inside the cell and it will swell up.

There are three kinds of solutions- isotonic, hypotonic, and hypertonic solutions.

When a solution has the same osmotic concentration as the cell, it is known as an isotonic solution. If a cell is placed in such a solution, water neither enters the cell nor exits from it and the cell remains the same in size.

When a solution’s osmotic concentration is more than a cell's, it is known as a hypertonic solution.

When a cell is placed in such a solution it loses water and shrinks.

When a solution’s osmotic concentration is less than a cell's, it is known as a hypotonic solution.

When a cell is placed in such a solution, water enters inside it and the cell swells up.

In the given situation, solution a is hypotonic with respect to solution b.

So, if a cell from solution b is placed in solution a, water will enter the cell and it will swell up.

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Answer: Make it extra pointy and the paper must be strong secure, but not too heavy or else is wont fly.

Explanation: it will work if you follow these steps:... BELIEVE IN YOURSELF!!! :)

The mass of the tin can with a density of 7.28g/mL and volume of 300.1mL is 2184.73 grams.

Density is simply referred to as mass of a unit volume of a material substance. It is expressed mathematically as;

p = m / v

Where m is mass and v is volume.

Given the data in the question;

To determine the mass of the tin can, plug the given values into the into the above formula and solve for m.

p = m / v

7.28 g/mL = m / 300.1mL

Cross multiply

m = 300.1mL × 7.28 g/mL

m = 300.1 × 7.28 g

m = 2184.73 g

The mass of the tin can with a density of 7.28g/mL and volume of 300.1mL is 2184.73 grams.

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Answer:

2.59 × 10^-3

move the decimal 3 spots to the right

An element is dull, brittle and a poor conductor of heat and electricity therefore the letter would be a likely place for this element to be located on the Periodic Table is B which is the third option.

These are referred to as semi-conductors and they are elements which have similar physical and chemical properties to that of metals and non-metals and a good example is Boron.

Boron has the symbol B and it is a dull, brittle element and also a poor conductor of heat and electricity which are examples of the properties of a nonmetals. It however conducts electricity under very high temperature.

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Answer:

H20 only

Explanation:

It's because that When a chemical forms, It turns into a product. The product can't just float away, but byproducts can.

The relative atomic mass, Ar, of element X is 1.43.

The relative atomic mass can be calculated by multiplying the mass of the isotope by the total isotope's abundance x 100. It is the weight is grams of the number of atoms of the element.

Given, that isotopes  X - 17 which is 11%

The isotopes X - 13 which is 89%

The relative atomic mass will be

Ar = ∑ isotopic mass × total isotope abundance 100.

Putting the values in the equation

11 / 100 x 13 / 100 x 100 = 1.43

Thus, the relative atomic mass, Ar, of element X is 1.43.

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Atomic structure refers back to the structure of an atom comprising a nucleus (center) wherein the protons (undoubtedly charged) and neutrons neutral are gifted. The negatively charged particles called electrons revolve around the center of the nucleus.

10. The elements with the number of particles:-

a. 26 electrons and 26 protons are Iron Fe.

b. Iodine(I)

c. Helium (He)

d. Calcium (Ca)

e. Radon (Rn)

11. Yes/No

a. Yes

b. No

c. Yes,

d.Yes

12. Proton, neutral, negatively, electron

13. Proton and Neutron

14. Proton, Neutron,  mass number.

15. a. Proton, neutron electron.

     b. atomic number = 5

     c. mass number = 11

16. 36 - 25 = 11 neutrons.

An atom is a particle of depending that uniquely defines a chemical element. An atom includes a principal nucleus which is surrounded by way of one or greater negatively charged electrons. The nucleus is undoubtedly charged and carries one or greater distinctly heavy particles called protons and neutrons.

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Scientists utilize their knowledge of previous occurrences to establish a general principle or explanation that may be used to forecast future events.

Step 1: Collect data. These observations must be objective rather than subjective. In other words, the findings should be verifiable by other scientists. Subjective observations based on human ideas and beliefs do not belong in the world of science.

Step 2: Create a hypothesis. Our observations provide information about the past or the present. We want to be able to forecast future occurrences as scientists. As a result, we must employ our reasoning abilities.

A hypothesis is a name given to the general principle. Inductive reasoning is the sort of reasoning involved (deriving a generalization from specific details).

A hypothesis should include the following features:

• It should be a universal concept applicable across space and time.

• It should be a working hypothesis.

• It should be consistent with existing observations.

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The mole fraction of H₂ = 0.55

Applying the ideal gas law

P V = n R T

      =P V/R T

NO₂ = (2atm) (5L)/ RT

NH₂ = (4atm) (3L)/ RT

Assume the temperature of the two gases remains the same before and after the mixing occurs. The mole fraction of H₂ is

XH₂ = nH₂ /[tex]n_{total}[/tex] = nH₂ / nH₂+ nO₂

                          = [tex]\frac{\frac{(4atm)(3L)}{RT}}{\frac{(4atm)(3L)}{RT}+\frac{(2atm)(5L)}{RT}}[/tex]

                          = [tex]\frac{(4atm)(3L)}{(4atm)(3L)+ (2atm)(5L)}[/tex]

                          = 0.545455

The mole fraction of H₂ = 0.55

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Answer:

6.50 g of Hydrogen

Explanation:

We know that in every 20.0g of sucrose, there are 1.30g of hydrogen.

We now have 100.0g of sucrose. 100.0g is 5x larger than the 20.0g sample, which is a 5 : 1 ratio. Applying this ratio to the amount of hydrogen, we would have 5*1.3g of hydrogen in the 100.0g of sucrose.

5*1.3 = 6.5, so our answer is that there are 6.50g of hydrogen in 100.0g of sucrose.

Hope this helps!

Answer:

1001

Explanation:

Zeroes between non zero digits are significant

Answer:

1001 g and 120.0 mL

Explanation:

Zeros in-between natural numbers are significant

If your number has a decimal place, and you have zeroes after a natural number, then all the zeros are sig figs.

Ex: 10000.0 = 6 sig fig

Not: 0.00001 = 1 sig fig

Not: 0012.0 = 3 sig fig

Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they create a new arrangement of electron shells.

The energy needed to break a double covalent bond is 614 J, whereas the energy needed to break a single bond is 349 J.

Since a double bond requires more energy to break than a single bond does, it is stronger than a single bond. As opposed to single bonds, which can spin freely, double bonds are constrained in their rotation, making them stronger.

In comparison to a single bond between the same two atoms or molecules, a double bond is both stronger and shorter. Even stronger and shorter is a triple bond.

A bond order of 1.5, such as that found in ozone, is stronger than a single bond but weaker than a double covalent bond.

There are two single bonds and one double bond in this molecule’s high electron density areas.

While the double bond results in somewhat bigger angles (121°), and the angle between the single bonds is slightly less (118°), the basic geometry is trigonal planar with 120° bond angles.

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Complete Question

Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________.

(a) create a new arrangement of electron shells.

(b) change the reactivity of the bonded atoms.

(c) limit the rotation of the bonded atoms.

(d) prevent additional bonds from being formed with the bonded atoms.

The substance that increases [H+ ] and decreases pH when it dissociates in water is called an acid.

Acids are substances that have lower than seven pH. They are sour in taste, and they dissociate into H+ ions in the water when dissolved in water. A strong acid is a hydrochloric acid, a weak acid is a nitric acid.

They have no electrons, just protons. They turn blue litmus paper to red. Furthermore, they react with metals to form hydrogen, and they react with a base to form salts.

Thus, the substance that decreases the pH when mixed with water is acid.

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Answer:

I think 3.5 times 120mi

Explanation:

9 -3/4=

The chemical formula which represents an organic molecule is  CCl₂F₂.

Organic compounds are those which have carbon atoms in them whereas inorganic compounds do not have carbon atom in it, but their are some exceptions.

Among the give responses,

                    CCl₄ + 2HF -----SbF₅-----> CCl₂F₂ + 2HCl

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