Which group beleow is correctly placed in order of least to most electronegative
K, Si, O, F
Si, K, O, F
F, O, SI, K
F, K, O, Si,

Answer:

I believe your answer should be C.

Explanation:

Your smartphone is composed of atoms.

Gold is not a type of light.

Answer: Removing salt from sea water

Answer:

removing seed casings from grains

a soda bottle bubbling when it is opened

removing salt from seawater

The balanced reactions are;

NH3 (aq) + HBr (aq) → NH4Br (aq)

PO4^3-(aq) + H3O^+(aq) ----> HPO4^2- (aq)+ H2O(l)

HS^-(aq) + OH^-(aq) ----> H2O(l) + S^2-(aq)

A conjugate acid/base pair consists of two species that are distinct from one another by one proton. The base is the species that can accept a proton, and the acid is the species that can donate a proton. When a base takes a proton, it changes into an acid, and when an acid gives a proton, it changes into a base.

In reaction (1) above, the conjugate acid of NH3 is NH4^+ while the conjugate base of HBr is Br^-.

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Answer:

The two system must be the same temperature for it to occur

Hope it helps

Answer: C // One system must have higher kinetic energy than the other system.

Explanation: edge 2023

Answer:

if you weigh 100 pounds on Earth, you would weigh only 38 pounds on Mercury. That's because Mercury weighs less than Earth, and therefore its gravity would pull less on your body. If, on the other hand, you were on heavy Jupiter, you would weigh a whopping 253 pounds!

Answer:

Science tells us that light is the reason we are able to see objects. Without light, we wouldn't be able to process the visible world. ... The electromagnetic spectrum is the range of all types of electromagnetic radiation, including visible light, infrared light, ultraviolet light, X-rays, and gamma rays.

Explanation:

i hope this is right :)

Answer:1

Explanation:i know cuz I got it right

NaBr is classified as a compound because sodium and bromine are chemically combined in a fixed proportion.

Explanation:

So, from this, we can conclude that NaBr is classified as a compound because sodium and bromine are chemically combined in a fixed proportion.

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Under normal atmospheric pressure, it boils.

The freezing point of pure water falls at 32 on this scale (and the boiling point at 212). Because Anders Celsius DID use water as the foundation for his scale, the values for these phase transition points (0 and 100 degrees) on the Celsius scale are more practical.

Technically, pipes can freeze at 32 degrees because that is the temperature at which water begins to freeze. Yet, it's not quite that easy. At 32 degrees or lower, pipes can freeze, but it takes a sustained amount of time for this to happen.

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Fahrenheit 32 = Water freezes

Fahrenheit 212 = Water boils

Answer:

True...I think I'm not sure

The half reaction with a more positive standard reduction potential will proceed spontaneously in a redox reaction

The half reaction with a more positive standard reduction potential will undergo reduction when compared to the half reaction with a more negative standard reduction potential.

Oxidation-reduction reactions, often known as redox reactions, are a set of chemical reactions that involve electron transfer between reactants. In a redox reaction, one reactant is oxidized, losing electrons, while the other reactant is reduced, gaining electrons.

The oxidation half-reaction is the process of losing electrons and increasing the oxidation number, whereas the reduction half-reaction is the process of gaining electrons and decreasing the oxidation number. The total reaction is referred to as the redox reaction.

Half-reaction:Half-reaction refers to the two parts of an oxidation-reduction reaction that happen separately. A half-reaction must always be either an oxidation reaction or a reduction reaction. It also describes the movement of electrons and hydrogen ions in an equation.

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Answer:

C.) 0.85m

Explanation:

If you moved it for 3 seconds and it went 0.65m then continued to move for another 0.20m you would just add the two numbers together.

0.65+0.20=0.85m

Answer:

28.22L of HF are needed.

Explanation:

1st) It is necessary to convert the 14.2L H2 to moles, using the relation for gases that 22.4L is equal to the volume of 1 mole:

2nd) Now, with the stoichiometry of the balanced reaction (we know that 1 mole of H2 is formed from 2 moles of HF), and the 0.63 moles of H2, we can calculate the moles of HF needed:

Now we know that 1.26 moles of HF can produce 14.2L (0.63moles) of H2 gas.

3rd) Finally, we have to convert the 1.26 moles of HF to liters:

So, 28.22L of HF are needed.

Answer:

For example, the chemical formula for water is H2O which indicates that 2 atoms of Hydrogen combines with 1 atom of oxygen.

Explanation:

The chemical formula for sodium chloride (Salt) is NaCl indicating that one atom of sodium combines with one atom of chlorine in a one-to-one ratio.

The kinetic energy of the oxygen gas under the same condition is the same as that of helium.

We know that the kinetic energy of a gas depends on the temperature of the molecules of the gas. Temperature is the measure of the average kinetic energy of the molecules of the gas.

When we know that we have two gases, what would determine the average kinetic energy of the molecules of the gas would only be the temperature of the gas. Thus irrespective of the molar masses of the gases, they would have the same kinetic energy at the same temperature.

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A chemical reaction in which electrons are transferred from one atom to another is an ionic bond.

The total transfer of certain electrons from one atom to another results in the formation of an ionic bond.

A negatively charged ion known as a cation results from an atom losing one or more electrons. An anion, an ion with a negative charge, is created when an atom gains one or more electrons.

Ionic bonds are formed for a number of reasons, one of which being the stark disparities in electronegativity between atoms, which draw other atoms near them for the exchange of electrons.

Thus,A chemical reaction in which electrons are transferred from one atom to another is an ionic bond.

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Answer:

alkali metals

Explanation:

s block elements are also called alkali metals

Answer:

B) 10.1g

Explanation:

Answer:

10.1 g

Explanation:

Answer:I suppose it is mercury...

Explanation:

I don't say u must have to mark my ans as brainliest but if it has really helped u plz don't forget to thnk me...

The concentration of the acid is \(0.25 M\).

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.

The titration formula can be given by,

(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)

\(\Rightarrow V_1N_1=V_2N_2\)

Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).

The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).

The equivalence of the base (\(NaOH\)) is \(1\).

Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).

Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).

Let us assume that the normality of the acid (\(HCl\)) \(N_2\).

Substitute the values in the given formula of titration.

\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)

Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).

The equivalence of the acid (\(HCl\)) is \(1\).

Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).

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So when something is boiling it is moving faster meaning the molecules are more spread out and not condense like a solid

So the answer is the 2nd set

Answer:

i think niether

Explanation:

The sample of white powder contains 47.1% K2CO3 and 0.39% Na2CO3.

Molar mass of sodium carbonate = 106 g/mol

Molar mass of potassium carbonate = 138 g/mol

Number of moles of HNO3 = 10/1000 L × 0.8903 M = 0.008903 moles

Mass of HNO3 =  0.008903 moles × 63 g/mol = 0.56 g

Mass of sample added = 1.091 g

Mass of sample left over = 0.573 g

Mass of sample reacted = 1.091 g - 0.573 g = 0.518 g

The reacted sample contains xg of Na2CO3 and (0.518 - x) g K2CO3.

Na2CO3 + 2HNO3 --> 2NaNO3 + CO2 + H2O

106g of Na2CO3 reacts with 126g of HNO3

x g of Na2CO3 reacts with (126 × x/106)g of HNO3

K2CO3 + 2HNO3 --> 2KNO3 + CO2 + H2O

138 g of K2CO3 reacts with 126 g of HNO3

(0.518 - x) g of K2CO3 reacts with [(0.518 - x) × 126/138] g

Total mass of HNO3 used;

1.19x + 0.47 + 0.91x = 0.56

2.1x + 0.47 = 0.56

2.1x = 0.56 - 0.47

2.1x = 0.09

x =  0.09/2.1

x = 0.0043 g

Mass of K2CO3 = (0.518 - x) g = 0.518 - 0.0043 = 0.5137 g

Mass percent of K2CO3  = 0.5137 g/ 1.091 g × 100/1 = 47.1%

Mass percent of Na2CO3 = 0.0043/1.091 g × 100/1 = 0.39%

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Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer: At a pressure of 15.613 atm a 5.32 mol \(Cl_{2}\) sample occupy 5.08 L at 181.59 K.

Explanation:

Given: Moles = 5.32 mol

Volume = 5.08 L

Temperature = 181.59 K

Formula used to calculate the pressure is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\P \times 5.08 L = 5.32 mol \times 0.0821 L atm/mol K \times 181.59 K\\P = \frac{5.32 mol \times 0.0821 L atm/mol K \times 181.59 K}{5.08 L}\\= 15.613 atm\)

Thus, we can conclude that at a pressure of 15.613 atm a 5.32 mol \(Cl_{2}\) sample occupy 5.08 L at 181.59 K.

0.25 Molarity of lead nitrate aqueous solution is there when a solution of nacl is added slowly to  a solution of lead nitrate.

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Hello!

\(\large\boxed{a = 3m/s^{2}}\)

Use the following equation to solve for the average acceleration of the motorcycle:

\(a = \frac{v_{f}-v_{i}}{t}\)

Plug in the given final, initial velocities, and the time:

\(a = \frac{15-6}{3}\\\\a = \frac{9}{3}\\\\a = 3m/s^{2}\)

Moles of oxygen = 22g / 32 (Mr of O2)

Moles of oxygen = 0.7 moles (1 dp)

Avogadro's constant = 6.02×10^23 particles per mole

0.7 moles×(6.02×10^23) = Answer

This is assuming it wants O2, if it wants pure oxygen then replace 32 with 16.

Answer:

The pH value is 3.23

Explanation:

Given that,

\([H_{3}O^{+}]=5.79\times10^{-4}\ M\)

We know that,

pH is defined as the negative log10 of the hydrogen ion activity,

We need to calculate the pH

Using formula of pH

\(pH=-log_{10}[H_{3}O^{+}]\)

Put the value of \([H_{3}O^{+}]\)

\(pH=-log_{10}(5.79\times10^{-4})\)

\(pH=3.23\)

Hence, The pH value is 3.23