Which combination will make a buffer?

A. NaOH and NaCl

B. KOH and KC1

C. HC1 and NaCl

D. CH3COOH and CH3COONa

Answer:

In the reaction between vinegar and baking soda, the reactants are vinegar (acetic acid) and baking soda (sodium bicarbonate). The products are sodium acetate, water, and carbon dioxide gas.

24.6 mol Cu

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 1.48 × 10²⁵ atoms Cu

[Solve] moles Cu

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

24.5766 mol Cu ≈ 24.6 mol Cu

Answer:

D

Explanation:

Has no definite shape and no definite volume

Answer: Thus empirical and molecular formula is sa,e for [tex]C_4H_8O[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

1. The empirical formula is [tex]CO_2H[/tex]

The empirical weight of [tex]CO_2H[/tex] = 1(12)+2(16)+1(1)= 45g.

The molecular weight = 90 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }{\text{Equivalent weight}=\frac{90}{45}=2[/tex]

The molecular formula will be=[tex]2\times CO_2H=C_2O_4H_2[/tex]

2. The empirical formula is [tex]CH_3O[/tex]

The empirical weight of [tex]CH_3O[/tex] = 1(12)+3(1)+1(16)= 31 g.

The molecular weight = 62 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }{\text{Equivalent weight}=\frac{62}{31}=2[/tex]

The molecular formula will be=[tex]2\times CH_3O=C_2H_6O_2[/tex]

3. The empirical formula is [tex]C_2H_4O[/tex]

The empirical weight of [tex]C_2H_4O[/tex] = 2(12)+4(1)+1(16)= 44 g.

The molecular weight = 88 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }{\text{Equivalent weight}=\frac{88}{44}=2[/tex]

The molecular formula will be=[tex]2\times C_2H_4O=C_4H_8O_2[/tex]

4. The empirical formula is [tex]C_4H_8O[/tex]

The empirical weight of [tex]C_4H_8O[/tex] = 4(12)+8(1)+1(16)= 72 g.

The molecular weight = 72 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }{\text{Equivalent weight}=\frac{72}{72}=1[/tex]

The molecular formula will be=[tex]1\times C_4H_8O=C_4H_8O[/tex]

Answer: the answer is in the photo pls check and pls pls mark me as brainliest

Explanation:

During periods of strenuous activity muscle cells run low on oxygen.

Muscle cells are defined as the cellular components of muscle tissue.  Muscle cells are designed to contract, or produce a pulling force, in order to stabilize or move different body parts. Skeletal, visceral, and heart muscle cells are the three different types. They are located in the organs' hollow walls. The muscular system is made up of a variety of muscle types, each of which is essential to how the body works.

Lactic acid is produced and accumulates in the muscle when there is a high energy demand, rapid changes in the energy requirement, and a lack of oxygen. During prolonged, intense activity, muscle pH falls to 6.4–6.6. Your muscles are forced to contract as forcefully as they can during this form of exercise, which results in an increase in the number of contractile filaments in your muscle cells.

Thus, during periods of strenuous activity muscle cells run low on oxygen.

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Answer:

See explanation

Explanation:

The compound CHOOH is more acidic than  CH3CH2NH2  because the carbonyl group is strongly electron withdrawing hence electron density is withdrawn from the O-H bond making easier for the proton to be lost.

CH3CH2NH2 is more basic than CHOOH  because of the lone pair of electrons on the nitrogen atom of CH3CH2NH2. This is reinforced by the electron pushing effect of the CH3CH2-group thereby making the amine more basic(able to abstract a proton) than CHOOH .

The images attached show the structures of CHOOH and CH3CH2NH2 . They are able to react because of the proton in CHOOH  and the lone pair of electrons in CH3CH2NH2 as shown in image III. This is a reaction in which the lone pair on CH3CH2NH2 abstracts a proton from  CHOOH   leading to the formation of the products as shown.

there are 3.7503824 moles in 245.2g of zinc

Answer:

hey are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic mattet.

Explanaticuz im naruto uzamaki

Answer:

c.11.43 g of aluminum hydroxide

Explanation:

Answer:

b

Explanation:

Answer:

answer b I think so I'm.not clear about it ,I think its CRT ans plz follow me

Answer:

1

Explanation:

the answer is the first option because it's at less of an incline than the others, hope this helps!

Answer:

123.2 Liters.

Explanation:

At STP (T = 273K & P = 1atm), one mol of any gas will occupy 22.4 liters.

With the above information in mind, we can calculate how many liters would 5.500 mol of gas occupy:

5.500 mol * 22.4 L / mol = 123.2 L

So 5.500 moles of C₃H₃ would have a volume of 123.2 liters at STP.

Answer:

A. Bees bringing pollen from the flower of one plant to the flower of another plant.

Explanation:

Genetic diversity in organisms is enhanced by the process of sexual reproduction due to the meiotic process that the participant organisms undergo to produce gametes. A process unique to meiosis called CROSSING OVER ensures that the alleles of genes are recombined in the GAMETE or sex cells.

According to this question, POLLINATION, which is the transfer of pollen from a male flower to a female one, will lead to sexual reproduction via fertilization. However, a cross-pollination, which requires a pollinator like the bees in this question will ensure the most genetic diversity among the offsprings.

Answer:

Letter C is the answer Hope it helps!

Answer:

2CO + O2 =====> 2CO2          ΔH = -566 KJ

Explanation:

A thermochemical equation is a chemical equation that includes the enthalpy change of the reaction (Lumen Learning).

In a thermochemical equation, we can easily see the heat of reaction written after the symbols of reactants and products. It tells us whether heat was evolved or gained in the chemical process. When heat is gained ΔH = positive. When heat is evolved, ΔH = negative.

The thermochemical equation for the reaction of CO and O2 is shown below;

2CO(g) + O2(g) =====> 2CO2 (g)         ΔH = -566 KJ

Answer:

the answer should be D, I hope this helps!

Answer:

See explanation

Explanation:

We know that the possession of polar bonds does not make a molecule polar. The BeCl2 molecule has Be-Cl bonds which are polar. However, the molecule is symmetrical and has a zero net dipole moment hence the molecule is nonpolar.

H2O is a polar molecule. It has polar O-H bonds. The molecule is bent and has a resultant dipole moment hence it is polar.

Ozone is a triatomic molecule which is bent in shape. This bent geometry creates an overall dipole moment in the molecule, hence the molecule is polar.

Answer:

C3H8 + 502 ----> 3CO2 + 4H20

Explanation:

Answer:

The metals Co, Cu and Ti all require Roman numerals in the names of their compounds.

The elements Co, Ni, and Hg are all transition elements.

The elements P, As, and Bi are in the same family on the periodic table.

Explanation:

Transition elements are those which changes their charges as they bond with other elements or forms a compound with other elements. They show transitional behavior when they bond. Some of the transition elements are :

Chromium, Titanium, cobalt, mercury, copper, iron, vanadium, zinc, Silver, etc.

The transition elements use roman numerals in their names of the compounds.

Therefore, Cobalt (Co), Copper (Cu) and Titanium (Ti) are the elements that require a Roman numeral in the names of their compounds.

The elements Phosphorus (P), Arsenic (As) and Bismuth (Bi), they all belong to the nitrogen family of Group 15 (Va).  

Answer:

2) ch4 because 8 electrons are shared in this molecule

Explanation:

The bond between carbon and hydrogen in the molecule; CH4 is a covalent bond. This bond involves sharing of electrons. Carbon has a valency of 4 and needs four more electrons to complete it's electronic configuration. These 4 electrons are taken care of by the 4 hydrogen atoms which each have a valency of 1.

Answer:

33.0 L

Explanation:

Step 1: Given data

Step 2: Convert the temperatures to the Kelvin scale

We will use the following expression.

K = °C + 273.15

T₁: K = 25.00°C + 273.15 = 298.15 K

T₂: K = 55.00°C + 273.15 = 328.15 K

Step 3: Calculate the final volume of the balloon

If we assume ideal behavior, we can calculate the final volume of the balloon using Charles' law.

V₁/T₁ = V₂/T₂

V₂ = V₁ × T₂/T₁

V₂ = 30.0 L × 328.15 K/298.15 K = 33.0 L

Answer:

Option C. Na⁺(aq) and Cl¯(aq)

Explanation:

From the question given above, we obtained the following:

Na₂SO₄(aq) + CaCl₂(aq) —> CaSO₄(s) + 2NaCl(aq)

Ionic Equation:

2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)

From the ionic equation above, we can see that Na⁺(aq) and Cl¯(aq) are present on both side of the equation.

Therefore, Na⁺(aq) and Cl¯(aq) are the spectator ions because they did not participate directly in the reaction.

Answer:

A phase change is occurring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.

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The phase transition takes place at the molecular level by changing the strength of intermolecular forces between the molecules.

Phase changes can be defined as the physical processes of transition between a state of a medium, identified by some parameters. These changes in states of matter that can be written as liquid, gas, solid, and plasma.

A particular phase in a thermodynamic system exhibits uniform physical properties. During a phase transition, some properties of the medium change, because of the change in external conditions, such as temperature, and pressure.

In a solid state, the molecules are compactly bound by a strong force of attraction. In the liquid state, the molecules have lesser attraction forces. The phase changes depend upon the temperature and pressure.

Therefore, phase transitions occur on a molecular level as the alteration in the strength of intermolecular forces.

Learn more about phase changes, here:

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Answer:

B

Explanation: