which of the following is a characteristic of a weak acid? A. It does not conduct electricity in water B. It is not as dangerous as a strong acid C. It is less concentrated than a strong acid D. It does not dissociate completely in water

Answer:

P.A.S.S

pull, aim, squeeze, sweep.

hope this answer correct (^^)..

Answer:

The proper way of using an extinguisher is:

pull, aim, squeeze and sweep.

Explanation:

P-pull

A-aim

S-squeeze

S-sweep

You can always use this to remember, okay.

Hope it helps.

Explanation:

pottassium  its one of covalent bond

Answer:

Option A. 25.7 L.

Explanation:

Step 1:

Data obtained from the question. This include the following:

Initial volume (V1) = 37.2 L

Initial pressure (P1) = 362.43 kPa

Initial temperature (T1) = 46.5 °C

Final pressure (P2) = 693.9 kPa

Final temperature (T2) = 149.2 °C

Final volume (V2) =.?

Step 2:

Conversion of celsius temperature to Kelvin temperature.

This can be achieved as shown below:

Temperature (K) = Temperature (°C) + 273

T (K) = T (°C) + 273

Initial temperature (T1) = 46.5 °C

Initial temperature (T1) = 46.5 °C + 273 = 319.5 K.

Final temperature (T2) = 149.2 °C

Final temperature (T2) = 149.2 °C + 273 = 422.2 K.

Step 3:

Determination of the new volume.

This can be obtained by using the general gas equation as shown below:

Initial volume (V1) = 37.2 L

Initial pressure (P1) = 362.43 kPa

Initial temperature (T1) = 319.5 K

Final pressure (P2) = 693.9 kPa

Final temperature (T2) = 422.2 K

Final volume (V2) =.?

P1V1/T1 = P2V2/T2

362.43×37.2/319.5 = 693.9 × V2/422.2

Cross multiply

319.5×693.9×V2 = 362.43×37.2×422.2

Divide both side by 319.5 × 693.9

V2 = (362.43×37.2×422.2)/(319.5×693.9)

V2 = 25.7 L

Therefore, the new volume is 25.7 L.

The element that has been reduced in the redox reaction [tex]AgNO_3 + Na NaNO_3 + Ag[/tex] is silver (Ag). A redox (reduction-oxidation) reaction involves the reduction of one element by the gain of electrons and the oxidation of another element by the loss of electrons.

When sodium (Na) loses one electron to generate [tex]NaNO_3[/tex] in this reaction, sodium changes from its neutral state (with a zero oxidation number) to a positive oxidation state (+1). On the other hand, when silver (Ag) in AgNO3 gets one electron to create Ag, it moves from a +1 oxidation state to a neutral state (with zero oxidation number).

Silver is the element that undergoes reduction in this process because reduction entails a gain of electrons, reducing it from its +1 oxidation state to its neutral state.

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Answer:

the answer will be Oa. 2.26

Answer:

Option A. 416.1 g.

Explanation:

Data obtained from the question include the following:

Molarity = 1.743 M

Volume = 1.4957 L

Mass of CuSO4 =..?

Next, we shall determine mole of CuSO4 present in the solution.

This is illustrated below:

Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:

Molarity = mole /Volume

With the above formula, we can obtain the mole CuSO4 present in the solution as follow:

Molarity = 1.743 M

Volume = 1.4957 L

Mole of CuSO4 =..?

Molarity = mole /Volume

1.743 = mole of CuSO4 /1.4957

Cross multiply

Mole of CuSO4 = 1.743 x 1.4957

Mole of CuSO4 = 2.607 moles

Finally, we shall convert 2.607 moles of CuSO4 to grams.

This can be obtained as follow:

Molar mass of CuSO4 = 63.55 + 32.06 + (16x4) = 159.61 g/m

Mole of CuSO4 = 2.607 moles

Mass of CuSO4 =..?

Mole = mass /molar mass

2.607 = mass of CuSO4 /159.61

Cross multiply

Mass of CuSO4 = 2.607 x 159.61

Mass of CuSO4 = 416.1 g

Therefore, 416.1 g of CuSO4 is needed to prepare the solution.

Answer:

The atom with the highest mass with 139 protons and 154 neutrons, is atom 3

Explanation:

The information given are;

The number of protons, p, the number of electrons, e, and the number of neutrons, n, we have;

p,                               e,                       n,        

39,                             39,                     52

40,                             40                     50

139,                            39                     154

40,                              39                     51

Based on the information that the mass of the proton = 1.67262 × 10⁻²⁷ kg

The mass of the electron  = 1.094 × 10⁻³¹ kg

the mass of the neutron = 1.674927471 × 10⁻²⁷ kg

We have that the atom with the most number of neutron and proton which is atom 3, has the highest mass

we have

Answer:25.7

Explanation:

Answer:

hydrogen peroxide is a chemical name for hydrogen and oxygen

Explanation:

Photovoltaic means electricity from light

photo = light voltaic = electricity

SUNLIGHT is the answer

Hope this is correct

HAVE A GOOD DAY!

Answer:

38.28

Explanation:

4×8.32(p)=33.28         33.28+5=38.28

Considering the reaction stoichiometry, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.

The balanced reaction is:

4 P + 5 O₂ → P₄O₁₀

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of each element or compound is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 124 grams of P produces 284 grams of P₄O₁₀, 8.32 grams of P produces how much mass of P₄O₁₀?

[tex]mass of P_{4} O_{10}=\frac{8.32 grams of Px284 grams of P_{4} O_{10}}{124 grams of P}[/tex]

mass of P₄O₁₀= 19.05 grams

Finally, 19.05 grams of P₄O₁₀ can be produced from 8.32 g of phosphorus.

Learn more with this examples:

Answer:

pKb = 10.96

Explanation:

Tartaric acid is a dyprotic acid. It reacts to water like this:

H₂Tart  +  H₂O  ⇄  H₃O⁺   +  HTart⁻         Ka1

HTart⁻  +  H₂O  ⇄  H₃O⁺   +  Tart⁻²           Ka2

When we anaylse the base, we have

Tart⁻²   +  H₂O  ⇄  OH⁻  +  HTart⁻       Kb1

HTart⁻  +  H₂O  ⇄  OH⁻  +    H₂Tart          Kb2

Remember that Ka1 . Kb2  = Kw, plus pKa1 + pKb2 = 14

Kb2 = Kw / Ka1  →   1×10⁻¹⁴ / 9.20×10⁻⁴  = 1.08×10⁻¹¹

so pKb = - log Kb2   → - log 1.08×10⁻¹¹ = 10.96  

Answer:

Option A. 70.0 KPa.

Explanation:

Data obtained from the question include:

Pressure (torr) = 525.4 torr

Pressure (kPa) =?

The pressure expressed in torr can be converted kPa as shown below:

760 torr = 101.325 KPa

Therefore,

525.4 torr = (525.4 x 101.325) / 760 = 70.0 KPa.

Therefore, 525.4 torr is equivalent to 70.0 KPa.

Answer:

ionize

Explanation:

Acids are chemical substances that lose/donate their hydrogen ion (H+) when they react with water. This property of acids is termed IONIZATION. In a chemical reaction involving acids and bases, acids release their proton or hydrogen ion (H+) in the presence of water solutions to form a conjugate base, which is usually an anion.

For example, in the chemical reaction;

HX + H20 -------> X- + H30+

HX is the acid because it loses its electron to water and forms the anion, X-, which is the conjugate base. Hence, it can be said that acid HX ionizes in water.

Answer:

Not enough exercise, not enough water, not a healthy diet. Consume fluids regularly during exercise, and drink 16 ounces of fluid for every pound lost during your workout.

Explanation:

Answer:

c

Explanation: c

The statement that is true from the following is catalysts are important to the industry to increase product yields. The correct option is C.

Catalysts are substances that speed up or increase the rate of reaction. The biological catalysts are enzymes. Enzymes are made up of proteins, and they are used in the reaction to increase the yield in less time. Catalyst does not mix with the process and after the reaction.

There are many chemical catalysts like nickel and iron. These catalysts are used in chemical and manufacturing processes. They impact, accelerate, and promote the reaction to get different yields.

Thus, the correct option is C. Catalysts are significant to industry to increase product yields.

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Group 8 in the periodic table contains the lightest ferromagnetic element. Therefore, option B is correct.

Ferromagnetism can be described as a property of certain materials that results in a large observed magnetic permeability and large magnetic coercivity to form a permanent magnet.

Ferromagnetic materials are metals attracted to a magnet, a consequence of large magnetic permeability. Magnetic permeability can be defined as the induced magnetization of a material because of the presence of an external magnetic field.

A steel plate can acquire a permanent magnetization, which depends not only on the strength of the applied field but varies greatly among ferromagnetic materials.

Ferromagnetism can be described as the strongest type and is responsible for the phenomenon of magnetism in magnets. Substances weakly to magnetic fields with 3 other types of magnetism which are paramagnetism, diamagnetism, and antiferromagnetism.

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Answer:

Para otros usos de este término, véase Resistencia.

La resistencia antibiótica es la capacidad de un microorganismo para resistir los efectos de un antibiótico. La resistencia se produce naturalmente por selección natural a través de mutaciones producidas por azar. El antibiótico, al entrar en contacto con una población bacteriana, permite solo la proliferación de aquellas bacterias que presentan aquella mutación natural que anula la acción del antibiótico. Una vez que se genera la información genética, las bacterias pueden transmitir los nuevos genes a través de transferencia horizontal (entre individuos) por intercambio de plásmidos; o igualmente producto de una conversión lisogénica. Si una bacteria porta varios genes de resistencia, se le denomina multirresistente o, informalmente, superbacteria.

Answer:

Chimney soot

Explanation:

Answer:

BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O

Explanation:

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.  

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:

Left side: 1 Br, 5 O and 1 N

Right side: 1 Br, 3 O and 1 N

If the reaction occurs in an acidic medium:

So, balancing the oxygen:

BrO₃⁻ (aq) + NO₂(aq) → Br⁻(aq) + NO₃⁻ + 2 H₂O

Left side: 1 Br, 5 O and 1 N

Right side: 1 Br, 5 O, 1 N and 4 H

Then, balancing the hydrogens:

BrO₃⁻ (aq) + NO₂(aq) + 4 H⁺→ Br⁻(aq) + NO₃⁻ + 2 H₂O

Left side: 1 Br, 5 O, 1 N and 4 H

Right side: 1 Br, 5 O, 1 N and 4 H

You can see that you have the same amount on each side of the reaction. So the reaction is balanced.

Answer:

Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems.

Hope this helps.

Answer:

The person above me was right.

"Cacti remain homeostasis because of the lack of leafs it has, because it has no leaves it absorbs less heat keeping more water, it also has a nice waxy coat that remains moist and grows depending on the amount of water it holds, and it's stem acts as a water supply keeping the plant fed and cool in harsh ecosystems."

Explanation:

Answer:

C

Explanation:

Rate = k(A)m(B)n

The correct option is C.

What are K , m and N in the rate law equation?

The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants.The exponents m and n are the reaction orders and are typically positive integers, though they can be fractions, negative, or zero.

What do you mean by concentrations of reactants?

The increase in the concentration of reactants, the rate of reaction increases. Ions and molecules interact to form a new compound on increasing the concentration.

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Answer:

the answer is 70.906 g/mol

Explanation:

Answer:

214.12 g

Explanation:

mass = no. of moles x molar mass

molar mass of Cl2 = atomic mass of Cl x 2

= 35.453 x 2

=70.906

so the mass of 3.02 mol Cl2 = 3.02 x 70.906

=214.12 g

The postulation of the law of multiple proportions tells us that; Choice B. nitrogen combines with oxygen in small whole number mass ratios.

Law of multiple proportions states that if two elements form more than one compound, then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.

On this note, nitrogen combines with oxygen in small whole number mass ratios.

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At dynamic equilibrium, the concentration of ice and water has been equal. Thus, option D is correct.

The equilibrium state can be given as the condition when the reactant and the product in the chemical reaction have been in equal amount.

In the condition when the water has bee kept in the freezer, the water will condense at the freezing temperature and will be converted to ice. The water there has been the reactant while the ice has been the product.

According to the law of equilibrium, at the equilibrium there has been equal concentration of reactant and products. Thus, at dynamic equilibrium, the concentration of ice and water has been equal. Thus, option D is correct.

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Answer:

Enthalpy change = -98.6kJ

Explanation:

Based on the reaction:

2SO₂(g) + O₂(g) ⟶ 2SO₃(g), △H = -198 kJ

When 2 moles of SO₂ (Molar mass: 64.066g/mol) reacts with 1 mole of oxygen, enthalpy change is -198kJ

To know enthalpy change of 58.0g of SO₂ with excess oxygen we need to calculate moles of SO₂ thus:

58.0g SO₂ ₓ (1mol / 64.066g) = 0.905 moles SO₂

If 2 moles of SO₂ produce an enthalpy change of -198kJ, 0.905 moles SO₂ will produce:

0.905 moles SO₂ ₓ (-198kJ / 2 moles SO₂) =

Enthalpy change = -98.6kJ

Answer:

175.7 mL

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 223.6 mL

Initial temperature (T1) = 74.5 °C

Final temperature (T2) = stp = 273 K

Final volume (V2) =.?

Next, we shall convert celsius temperature to Kelvin temperature.

This is illustrated below:

Temperature (K) = Temperature (°C) + 273

T (K) = T (°C) + 273

Initial temperature (T1) = 74.5 °C

Initial temperature (T1) = 74.5 °C + 273 = 347.5 K

Finally, we shall determine the volume of the gas at standard temperature as follow:

Initial volume (V1) = 223.6 mL

Initial temperature (T1) = 347.5 K

Final temperature (T2) = stp = 273 K

Final volume (V2) =.?

V1/T1 = V2/T2

223.6/347.5 = V2/273

Cross multiply

347.5 x V2 = 223.6 x 273

Divide both side by 347.5

V2 = (223.6 x 273) /347.5

V2 = 175.7 mL

Therefore, the volume of the gas at standard temperature is 175.7 mL.