Suppose that Biuret reagent turns purple when it is added to an unknown substance. What can you conclude about the substance?

Add more chlorine so that chlorine is in excess in the reaction will be the most effective way to decontaminate the water from legionnaires disease.

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Answer: Food chain

Explanation: none

One time explanation of one observation is a hypothesis.

Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.

For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.

Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.

For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.

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Answer:

The main difference is that neutrons are neutral while protons are positive.

Explanation:

Neutrons have nor charge and protons have a positive charge. Hope this helps!

Answer:

Protons: Determine the element

Neutrons: Is for the Average atomic mass or AMU for short.

Explanation:

Answer:

C

Explanation:

Recall that, at equilibrium, the concentration of the reactants and products stop changing because both the forward and reverse reaction rates are equal.

Therefore, Choice C is correct.

Choice A is incorrect because there is no indication that the upper line describes the products and the lower line describes the reactants.

Choice B is incorrect because the statement, while true, is not reflected by the graph. (The two lines after equilibrium are not at the same y-value.)

Choice D is incorrect because the forward reaction rate generally decreases as time increases due to the decrease in reactant concentration(s).

Answer: B. Sulfur and chlorine would form a polar covalent bond together.

Explanation:

Polar covalent bonds are formed when atoms with different electronegativities form a covalent bond. In a polar covalent bond, the electrons in the bond are shared unequally, with one atom being slightly more electronegative than the other and therefore attracting the shared electrons more strongly. This creates a small electric dipole in the molecule, with the more electronegative atom at the negative end and the less electronegative atom at the positive end.

Sulfur and chlorine have different electronegativities and therefore would form a polar covalent bond. Copper and carbon, oxygen and sodium, and fluorine and fluorine would not form polar covalent bonds because their electronegativities are either too similar or not compatible for covalent bonding.

Answer:

D

Explanation:

Answer:

1.Reactivity

2.combustibility

3.Shape

Hope this helps,

If you think I am right please give brainliest

Happy Holidays!

Explanation:

Only Ag2CO3 will precipitate from the solution.

When Na2CO3 is added to the solution, it will react with the Ag^+ and Pb^2+ ions to form precipitates of Ag2CO3 and PbCO3. The Mn^2+ ion concentration is not high enough to form a precipitate with Na2CO3.

First, let's calculate the initial concentration of Ag^+ and Pb^2+ ions in the solution:

Ag^+: 0.00050 M

Pb^2+: 0.00050 M

Next, we need to calculate the concentration of Na2CO3 after it is added to the solution. Since we added 10.00 ml of 1.0*10^-6 M Na2CO3 to a total volume of 500 ml, the final concentration of Na2CO3 is:

[Na2CO3] = (10.00 ml / 500 ml) * 1.010^-6 M

[Na2CO3] = 2.010^-8 M

Now we can use the Ksp values to determine which precipitates will form.

For Ag2CO3:

Ksp = [Ag^+]^2[CO3^2-]

8.110^-12 = (2x)^2 (2x)

8.110^-12 = 4x^3

x = 2.0*10^-4 M

Since the concentration of CO3^2- is higher than the solubility product, Ag2CO3 will precipitate.

For PbCO3:

Ksp = [Pb^2+][CO3^2-]

7.410^-14 = (0.00050 M)(2x)

x = 9.210^-11 M

Since the concentration of CO3^2- is lower than the solubility product, PbCO3 will not precipitate.

Therefore, the only precipitate that will form is Ag2CO3.

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ΔTf=−0.634°C

Explanation:

We're asked to find the freezing point depression of a solution.

To do this, we use the equation

ΔTf= i⋅m⋅Kf

where,

ΔTf is the change in freezing point temperature that we're trying to find.

i  is the Van't Hoff factor, which is given as 1 (and usually is 1 in the case of nonelectrolytes)

m is the molality of the solution, which is

molality = mol solute /kg solvent

Convert the given mass of sucrose to moles using its molar mass:

35.0g sucrose(1lmol sucrose342.30g sucrose)=0.102 mol sucrose

The molality is thus

molality=0.120lmol sucrose/0.3000lkg water=0.341m

K f is the molal freezing point constant for the solvent (water), which is given as −1.86°C/m

Plugging in known values, we have

ΔTf=(1)(0.341m)(−1.86l°C/m)

=−0.634l°C

This represents how much the freezing point decreases. The new freezing point of the solution is found by adding this value from the normal freezing point of the solvent ( 0.0°Cfor water):

new f.p. = 0.0°C −0.634°C

= −0.6341°C

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The mass of copper sulfate obtained from the reaction of 25 grams of copper oxide with excess sulfuric acid is 50.27 grams.

The balanced chemical equation for the reaction between copper oxide and sulfuric acid is:

\(CuO + H_2SO_4\ - > CuSO_4 + H_2O\)

First, we need to calculate the number of moles of CuO:

n(CuO) = m/M = 25 g / 79.55 g/mol = 0.314 mol

Therefore, the number of moles  \(CuSO_4\) produced is also 0.314 mol.

Finally, we can calculate mass  \(CuSO_4\)  produced:

m(\(CuSO_4\)) = n(\(CuSO_4\)) x M(\(CuSO_4\)) = 0.314 mol x 159.61 g/mol = 50.27 g

Therefore, assuming the reaction proceeds to completion, the mass of copper sulfate obtained from the reaction of 25 grams of copper oxide with excess sulfuric acid is 50.27 grams.

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--The complete question is, What mass of copper sulfate can be obtained from the reaction of 25 grams of copper oxide with excess sulfuric acid, assuming the reaction proceeds to completion?--

Answer:

b or c but I would just pick c

Answer:

C

Explanation:

Sun is an energy source not a matter.

Answer:

Sugar is a polar compound , in the solid state of it Hydrogen bond strongly binds the molicules of sugar together. Being a non polar solvent and low polarity difference between Cl and C atom C—Cl bond in CCl4 is unable to form hydrogen bond. That's why sugar can't be soluble in CCl4.

Explanation:

The statement "Plasmas can change shape" and "Plasmas contain ionized particles" best describe plasmas.

Plasma is a state of matter similar to solids, liquids, and gases. It is often called the fourth state of matter. Plasmas are created by ionizing a gas, which means that some or all of its atoms have been stripped of their electrons, leaving behind positively charged ions and negatively charged electrons. The resulting mixture of charged particles can conduct electricity and respond to electric and magnetic fields.

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Since it reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

In order to pinpoint the row with a probable error, we will scrutinize the correlation between temperature and volume.

Typically, whenever there is an increase in temperature, there would be an accompanying escalation in the volume of a given substance.

Let's take a closer look at the values reflected in the table:

From A to B: Temperature rises but the volume remains stagnant.

From B to C: Both temperature and volume show an increment.

Similarly, from C to D, as well as from D to E, we see that for every rise in temperature, there is subsequently more volume illustrated.

Given the dissimilarity between rows A and B – where the former shows a temperature increase while the latter reflects no change in volume – it is most likely that the data recorded in row B is erroneous.

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Which row in the table below is likely to represent an error in the student's data collection?

Temperature (°C) Volume (cm³)

A 2.4 5.8

B 21.5 5.8

C 39.6 6.7

D 55.6 6.9

E 71.2 7.4

Answer:

A student collected the data shown above. Row

✔ B

may represent an error.

Explanation:

edge 2023

The type of energy transfer between the frozen ice cream and the tongue is convection. The frozen ice cream will gradually melt because of the temperature difference.

Convection is the method of heat transfer that involves the transmission of heat in a fluid (liquid or gas) by the circulation of currents.

According to this question, a spoonful of frozen ice cream is placed on the tongue. The heat transfer will occur between the tongue with warmer temperature and the ice cream with colder temperature.

The heat energy will flow from the tongue to the ice cream, hence, making it defreeze or melt with time. This type of heat transfer is convection because it involves a fluid.

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Answer:

When Logan opens a new bottle of carbonated beverage, the sudden release of pressure causes the beverage to bubble up and overflow. What could Logan do in the future to prevent the next bottle from overflowing when he opens it.

Explanation:

This is an application of Boyle's law.

According to Boyle's law:

the volume of a fixed amount of gas is inversely proportional to its pressure at a constant temperature.

\(V \alpha \frac{1}{P}\)

So, if pressure reduces all of a sudden, the volume increases and this causes an overflow of the beverage from the bottle.

To avoid this situation, the pressure inside the bottle should not be released at once. The bottle cap should be opened slowly in such a way that opens a little and then close again open a little and then close like that many times if we do, then pressure inside the bottle goes slowly then, the volume will not increase all of a sudden.

Compute the initial moles of HCl present in the buffer before any HCl was added. This may be accomplished by utilising the buffer's starting pH and the known dissociation constant (Ka) for the weak acid in the buffer. For example, if the buffer is formed of acetic acid (CH3COOH) and its starting pH is 4.5, we may determine the initial concentration of CH3COOH in the buffer using the Ka value for acetic acid (1.8 x 10-5).

Subtract the total moles of H+ at the location from the beginning moles of H+ in the buffer.

In a chemical process, an acid either provides protons (hydrogen ions) or receives electrons. Acids have a pH value less than 7 and are distinguished by their sour taste and capacity to dissolve certain metals, such as zinc and iron

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%Chlorine= Mass of organic compound

Mass of chlorine × 100 Chloral ( CCl 3CHO ) = 147.5106.5×100=72.20% Pyrene( CCl 4 )= 154142×100=92.20% Highest

Explanation:

Answer: Chloroform (CHCL3) has a lower percentage of Chlorine than CCL4 as:

Explanation:
Percentage of Chlorine in CCL4 is 93% whereas percentage of Chlorine in CHCL3 is 35%

Hope this helps.

Answer:

Option A. ZnCl₂ (aq) + H₂ (g)

Explanation:

In a chemical equation, reactants are located on the left hand side (L. H. S) while the products are located on the right hand side (R. H. S) i.e

Reactants —> Products

From the question given above, we obtained the following equation:

Zn (s) + 2HCl (aq) —> ZnCl₂ (aq) + H₂ (g)

The products of the above equation is:

ZnCl₂ (aq) + H₂ (g)

the oxidation state of each atom

The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.

Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.

The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.

Given the mass of the ¹⁹F = 18.9984 a.m.u.

The mass defect for the ¹⁹F can be calculated as:

Δm = \((M _n +M_p) - M_F\)

\(\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984\)

\(\triangle m =0.1588 \;a.m.u.\)

The binding energy for the fluorine can be calculated as:

E = Δmc²

E = 0.1588 × 931.5

E = 147.92 MeV

The binding energy per nucleon of ¹⁹F can be calculated as:

B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon

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The solutions for both are:

V_titanium = (1/4) V_total ≈ 0.188 cm³

And

V_iron = (3/4) V_total ≈ 0.565 cm³

We have a line in the V_titanium-V_iron plane with slope -4.5/7.87 and y-intercept 5/7.87. The two solutions above correspond to the points where this line intersects the line V_titanium = 0 and V_iron = 0, respectively.

The volume of titanium and iron in a bicycle can be related using the following constraint equation:

V_titanium * 4.5 + V_iron * 7.87 = M_total / 1000

where V_titanium and V_iron are the volumes of titanium and iron in cubic centimeters (cm³), M_total is the total mass of the bicycle in grams (g), and we divide by 1000 to convert the mass to kilograms.

We are given that the bicycle weighs 5 kg or 5000 g, so we can substitute M_total = 5000 into the equation:

V_titanium * 4.5 + V_iron * 7.87 = 5000 / 1000

4.5 V_titanium + 7.87 V_iron = 5

This is a linear equation in two variables, V_titanium and V_iron. To find two solutions, we need one additional equation that relates V_titanium and V_iron. One possibility is to assume that the bicycle contains a fixed ratio of titanium to iron, say 1:3. Then we can write:

V_titanium = (1/4) V_total

V_iron = (3/4) V_total

where V_total is the total volume of the bicycle, which is the sum of the volumes of titanium and iron:

V_total = V_titanium + V_iron

Substituting these expressions into the constraint equation and simplifying, we get:

(4.5/4) V_total + (7.87/4) V_total = 5/2

3.31 V_total = 5/2

V_total = (5/2) / 3.31

V_total ≈ 0.753 cm³

Using the ratios above, we can then calculate the volumes of titanium and iron:

V_titanium = (1/4) V_total ≈ 0.188 cm³

V_iron = (3/4) V_total ≈ 0.565 cm³

These are the two solutions for the volumes of titanium and iron in the bicycle, assuming a fixed ratio of 1:3.

To graph the constraint equation, we can solve for V_iron as a function of V_titanium:

V_iron = (5 - 4.5 V_titanium) / 7.87

This gives us a line in the V_titanium-V_iron plane with slope -4.5/7.87 and y-intercept 5/7.87. The two solutions above correspond to the points where this line intersects the line V_titanium = 0 and V_iron = 0, respectively.

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Answer: 1. The empirical formula is \(PNF_2\)  

2. The molecular formula is \(PNF_2\)

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of P = 37.32 g

Mass of N = 16.88 g

Mass of F = 45.79 g

Step 1 : convert given masses into moles.

Moles of P =\(\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{37.32g}{31g/mole}=1.20moles\)

Moles of N =\(\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{16.88g}{14g/mole}=1.20moles\)

Moles of F =\(\frac{\text{ given mass of F}}{\text{ molar mass of F}}= \frac{45.79g}{19g/mole}=2.41moles\)

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For P = \(\frac{1.20}{1.20}=1\)

For N = \(\frac{1.20}{1.20}=1\)

For F =\(\frac{2.41}{1.20}=2\)

The ratio of P: N: F= 1: 1: 2  

Hence the empirical formula is \(PNF_2\)

The empirical weight of \(PNF_2\)= 1(31)+1(14)+2(19)= 82.98 g.

The molecular weight = 82.98 g/mole

Now we have to calculate the molecular formula.

\(n=\frac{\text{Molecular weight}}{\text{Equivalent weight}}=\frac{82.98}{82.98}=1\)

The molecular formula will be=\(1\times PNF_2=PNF_2\)