Question 1 of 10

What is technology?

A. An understanding of something new.

B. The steps that engineers go through to create a product.

C. Something created using science for use by society.

D. A method that is used to solve problems,

SUBMIT

Answer:

B

Explanation:

because it is a trigonal planar compound

Three bonding pairs around a central atom results in a trigonal planar compound. Option B is correct.

In a trigonal planar arrangement, the central atom is surrounded by three bonding pairs of electrons, forming a flat, triangular shape. The bond angles between the bonding pairs are approximately 120 degrees.

This molecular geometry is observed when a molecule has a central atom with three bonded pairs and no lone pairs. Examples of compounds with  trigonal planar geometry include boron trifluoride (BF₃) as well as formaldehyde (H₂CO).

The other options are not correct for a molecule with three bonding pairs;

Octahedral refers to a molecular geometry with six bonding pairs around a central atom.

Tetrahedral corresponds to a molecular geometry with four bonding pairs around a central atom.

Linear represents a molecular geometry with two bonding pairs around a central atom.

Hence, B. is the correct option.

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Answer:

30 ml

Explanation:

Answer

B. Oil is nonpolar, but water is polar.

Explanation

Water is held together by hydrogen bonds. Hence water is a polar molecule. Oils and fats do not have any polar part and so for them to dissolve in water they would have to break some of water hydrogen bonds.

So, non-polar molecules (e.g oil) can only mix well with other non-polar molecules and not with polar molecules like water. Therefore, this explains why oil doesn't mix well with water.

The correct answer is: B. Oil is nonpolar, but water is polar.

Answer:

contamination

Explanation:

In a solution, when we have an acid being dissociated, what is actually happening is that the acid is being pulled apart by solvent molecules, becoming two ions, the proton H+ and the conjugated base, this is what causes the solution to be acidic, and this is also how the strength of the acid is measured. Therefore the best answer is letter D

From the information in the question, the formula unit of the salt is given as VCl.

The quantity of charge produced is obtained from;

Q = It

I = current (3 A), t = time (3600 s)

Q = 3 A × 3600 s

Q = 10800 C

Now we need to find the number of electrons transferred as follows;

51 g of Vanadium is deposited by 96500n C

5.70 g is deposited by 10800 C

5.70 × 96500n = 51 × 10800

n =  51 × 10800/5.70 × 96500

n = 1

The formula of the salt is VCl.

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Answer:

31

Explanation:

Answer:

C.One molecules with two ester ends

Explanation: In intramolecular Claisen condensations, reactions occur for 1,6 and 1,7 diesters, as these substances result in the formation of compounds containing five and six membered rings, respectively.

Usually, the Claisen condensation occurs between two ester molecules. Therefore, an intramolecular Claisen condensation should occur in one molecule with two ester ends.

The Claisen condensation was first achieved by Rainer Ludwig Claisen in 1887.

The reaction occurs between;

• two ester molecules

• one ester molecule and another carbonyl compound

• One molecule with two ester ends

The intramolecular Claisen condensation occurs in a molecule with two ester ends.  

An example of Intramolecular Claisen condensation is shown in the image attached to this answer.

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Answer:

a because it help in protecting disease

The limiting reactant is N₂O₄ and the mass of N₂ formed from the reaction is 45.7 g (Option C)

The limiting reactant can be obtained as illusrated below:

N₂O₄ + 2N₂H₄ -> 3N₂ + 4H₂O

From the balanced equation above,

92.02 g of N₂O₄ reacted with 64.1 g of N₂H₄

Therefore,

50 g of N₂O₄ will react with = (50 × 64.1) / 92.02 = 34.83 g of N₂H₄

From the above calculation, we can see that only 34.83 g of N₂H₄ out of 45.0 g reacted.

Thus, the limiting reactant is N₂O₄

The limiting reactant shall be used in this case in order to obtain a maximum yield of N₂. Details below:

92.02 g of N₂O₄ reacted to produce 84.06 g of N₂

Therefore,

50 g of N₂O₄ will react to produce = (50 × 84.06) / 92.02 = 45.7 g of N₂

Thus, the mass of N₂ formed is 45.7 g

Therefore, the correct answer to the question is (Option C)

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Answer:

d. A weak base

Explanation:

For this question, we have to start with the reaction between \(HF\) and \(NaOH\). So:

\(HF~+~NaOH~->~NaF~+~H_2O\)

Now, we have to analyze each compound:

Fluorhydric acid HF this is a strong acid because it has the ability to produce hydronium ions \(H^+\)

Sodium hydroxide NaOH this is a strong base because it has the ability to produce hydroxide ions \(OH^-\)

Sodium fluoride NaF is a salt in which the cation is \(Na^+\) and the anion is \(F^-\)

Water Is a neutral molecule usually the solvent

Now, we have the reaction of a strong acid with a strong base. If we remember the conjugated base theory, a strong acid will produce a weak base. So, NaF is a weak base. We also have water, but this is a neutral molecule. With this in mind, the answer is d.

I hope it helps!

Answer:

A is condensation

B  is Conduction

C is erosion

D is radiation

E is deposition

Explanation:

Answer:

Compaction.

Explanation:

All the others are before this.

Answer:

because of the substance contained in a fire extingudher it woulfnt start a fire.

The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4

In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.

The other pieces of evidence listed do not necessarily point to a nuclear reaction:

Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.

Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.

Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.

Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.

Option 4

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Answer:

\(\large \boxed{\text{0.57 g/mL; 3.7 mL; 6.6 g; 0.366 g/mL}}\)

Explanation:

1. Density from mass and volume

\(\text{Density} = \dfrac{\text{mass}}{\text{volume}}\\\\\rho = \dfrac{m}{V}\\\\\rho = \dfrac{\text{8.6 g}}{\text{15 mL}} = \text{0.57 g/mL}\\\text{The density is $\large \boxed{\textbf{0.57 g/mL}}$}\)

2. Volume from density and mass

\(V = \text{9.7 g}\times\dfrac{\text{1 mL}}{\text{2.6 g}} = \text{3.7 mL}\\\\\text{The volume is $\large \boxed{\textbf{3.7 mL}}$}\)

3. Mass from density and volume

\(\text{Mass} = \text{4.1 cm}^{3} \times \dfrac{\text{1.6 g}}{\text{1 cm}^{3}} = \textbf{6.6 g}\\\\\text{The mass is $\large \boxed{\textbf{6.6 g}}$}\)

4. Density by displacement

Volume of water + object = 24.6 mL

Volume of water                = 12.8 mL

Volume of object               = 11.8 mL

\(\rho = \dfrac{\text{4.3 g}}{\text{11.8 mL}} = \text{0.36 g/mL}\\\text{The density is $\large \boxed{\textbf{0.36 g/mL}}$}\)

Your drawing showing water displacement using a graduated cylinder should resemble the figure below.

BaO has ionic bonds because of electronegative difference.

Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical compound by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom gains electrons, it becomes a negatively charged ion (cation), while if it loses them, it becomes a positively charged ion (cation) (anion). Following is a brief discussion of ionic bonds. To learn more, go to chemical bonding: the ionic bonding process.

Ionic or electrovalent compounds are produced by ionic bonding, and the compounds formed between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound. Actually, a polar covalent bond is the extreme form of an ionic bond.

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The volume of carbon dioxide gas forms is equal to 48 L and The volume of oxygen gas needed is 76 L.

A combustion reaction can be explained as a reaction that forms fire and takes place at a high temperature. Combustion Reaction is the combustion of hydrocarbon reacts with oxygen gas to give carbon dioxide and water molecules.

Given the chemical reaction of the combustion reaction of hexane:

\(2C_6H_{14}(g) + 19O_2(g) \longrightarrow 12CO_2(g)+14H_2O(g)\)

Given the volume of hexane = 8.00 L

The number of moles of hexane  = 8/22.4 = 0.357 mol

The moles of oxygen required to react with 0.357 mol of Hexane is equal to :

= (19/2) × 0.357

= 3.39 mol

The volume of oxygen gas = 3.39 × 22.4 = 76 L

The moles of CO₂ produced from 0.357 mol of Hexane is equal to :

= (12/2) × 0.357

= 2.14 mol

The volume of carbon dioxide gas forms = 2.14 × 22.4 = 48 L

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Answer:

generally occurs on Ser, Thr, and/or Tyr side chains and to a lesser extent on the His side chain

Answer:

48000

Explanation:

maths

Answer:

48000

Explanation:

(5x10^3) = 5 × 1000 = 5000

(4.3x10^4) = 4.3 × 10000 = 43000

5000 + 43000 = 48000

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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Answer:

2 unpaired electrons

Explanation:

Carbon's bonding state electron configuration is 1s2 2s1 2s1 2p1 2p1. So, there are 4 unpaired electrons in the orbitals of carbon in bonding state.

hope this helps

The multiplication od 7.125 ×8.00 outputs = 57

Answer:

Explanation:

Small changes in the chemical nature of polysaccharides can make a big difference in how they work in our bodies. Polysaccharides are complex carbohydrates found in things like fiber and medicines. Even tiny changes in their structure can affect how they are digested, how they interact with cells, and their overall impact on our health. Scientists can use these changes to create materials with specific properties or develop new treatments. So, even small tweaks in polysaccharides can have a significant impact on how they function in our bodies.

Answer:

they are known as halogens

Explanation:

everything else is correct

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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