For each bond, select the arrow that indicates the direction of bond polarity. Leave the box blank for a completely (Δ=0.0) nonpolar bond.

Answer:

+3

Explanation:

This is ionic bond in combination with the basic rules of the coordination number of atoms in molecules, the O atom valence electrons 6, 3 valence electrons, Al₂O3 need to fill 2 electronic outer orbit, Al lose 3 electrons also brings inner shell stability, LCM is 6, 2 Al provides 2 x3 electronics, then it must have 3 O to accept it. If you have 2 O, there's no stable home for the extra electrons. So it usually forms Al₂O3

At equilibrium, the concentration of [Cu2+] in the solution is 0.3 M. To calculate the concentration of Cu2+ ions at equilibrium, we need to understand the chemical reaction that occurs between NH3 and CuSO4.

The initial volume of the NH3 solution is 0.9 liters, and its concentration is 0.3 M. It is used to dissolve 2.5 grams of CuSO4. At equilibrium, the concentration of Cu2+ ions ([Cu2+]) can be determined. In the presence of NH3, CuSO4 undergoes a complexation reaction to form a complex ion, [Cu(NH3)4]2+.

CuSO4 + 4NH3 ⇌ [Cu(NH3)4]2+ + SO4^2-

Since the NH3 solution is in excess, we assume that all of the CuSO4 has reacted and formed the complex ion at equilibrium. Therefore, the concentration of [Cu(NH3)4]2+ at equilibrium is equal to the initial concentration of NH3.

Given that the initial concentration of NH3 is 0.3 M, the concentration of [Cu(NH3)4]2+ (which is equivalent to [Cu2+]) at equilibrium is 0.3 M.

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Answer:

B. A mixture has different properties throughout; a pure substance has the same properties throughout

Explanation:

Which of the following best describes the difference between a mixture and a pure substance?

A. A mixture has the same properties throughout; a pure substance has the different properties throughout.

B. A mixture has different properties throughout; a pure substance has the same properties throughout.

C. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. ✓

D. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.

Answer:

A niche is a specie's function in its habitat or its level on the food chain, so two species competing at the same level for the same food and habitat eventually one species will have to migrate or starve due to lack of food.

Answer:

amplitude

Explanation:

The amplitude of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough

Answer:

I think it is wave length

Explanation:

yeah pretty sure

Answer:

c

Explanation:

In the modern periodic table, periods with heavier elements are longer than periods with lighter elements. This difference in period length exists because there are many more heavy elements than light elements.

The periodic table is arrangement of elements in groups and periods. Elements in the same group of the periodic table have the same number of valence electrons while elements in the same period have the same number of shells.

Period 1 contains the lightest elements, hydrogen and helium. However, in the periodic table, we notice that periods with heavier elements are longer than periods with lighter elements. This is because there are many more heavy elements than light elements.

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Answer:

I think some important qualities for a scientist to have is to be hard working, clever, and be able to manage your time and projects well. When you’re a scientist, you are going to be in a lab or in the field a lot. You need to be clever to carefully write down things that are important and interesting. You're also going to have to be hard working as well because as a scientist, it is important to work hard and get sound results.

I think one of the qualities that shows in my schoolwork is hard work. I always do my best on my assignments. I constantly work to get ahead and finish my work on time. The harder I work, the less work I have to do. Since I keep myself busy, I make myself less busy.

Explanation:

yep

Answer:

Explanation:

Criss Cross charges for the formula

No need to write 1 if there is a negative 1 or positive 1 charge

NO NEGATIVES in formula ONLY POSITIVE

The 2s cancel each other out same if it was both +4 and -4

Barium Chloride

Barium Oxide

Barium Iodide

Barium Sulfate

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Baking Soda is a substance is in nature.

Thus, An alkaline white powder called baking soda is a staple of contemporary kitchens. One significant brand is largely to blame for its rise. Dr. Austin Church and John Dwight, two brothers-in-law, joined forces to market baking soda in 1846 and baking soda.

The product was called Arm & Hammer Church & Co's bicarbonate of soda, and it was created in Dwight's kitchen. Arm & Hammer planned to demonstrate to the populace the ingredient's versatility by 1860.

They started handing out small cookbooks filled with recipes for various foods, including bread, cakes, cookies, puddings, and baking soda.

Thus, Baking Soda is a substance is in nature.

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The given question is 98, 99, 100 , 90, 98 , 100

Mean= \(\frac{Sum of observations}{Number of observations}\)

In mathematics and statistics, the average is the average of a set of values. The mean can be calculated in a number of ways, including the simple arithmetic mean (adding the numbers and dividing the sum by the number of observations), the geometric mean, or the harmonic mean.

Sum of observations is 98+99+100+90+98+100

The summation is 585

The number of observations is 6.

= \(\frac{98+99+100+90+98+100}{6}\)

= 97.5

So, the answer is 97.5

Answer:

no, food is not a fuel because it just give energy to do many activities but it will not provide any fuel only the dead and decaying material which berries under the soil then after a long years it becomes fossil fuel

The answers include the following:

This is referred to as a region of space, throughout which all physical properties of a material are essentially uniform and are distinct stages of development.

The most appropriate way in investigating this phase change is by understanding different ways and techniques that phase change happens so as to be knowledgeable about how their properties aids this process.

The best question to ask will be how phase change happen in ways unexpected and also the different ways that phase change can occur thereby making it the correct choice.

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Answer:

here down below is the anwser

Explanation:

Whereas ionic compounds are usually formed when a metal and a nonmetal combine, covalent compounds are usually formed by a combination of nonmetals. Thus, the periodic table can help us recognize many of the compounds that are covalent.

Answer:

An energy diagram can be defined as a diagram showing the relative potential energies of reactants, transition states, and products as a reaction progresses with time.

Explanation:

The composition and management of solid waste can vary significantly based on several factors such as geographical location, population size, level of industrialization, cultural practices, and available infrastructure.

Here are some ways in which the composition and management of solid waste can vary:

1. Composition: The types of waste generated can vary depending on the activities and industries in the area. In urban areas, the waste stream typically consists of household waste, commercial waste, construction and demolition waste, and institutional waste. In industrial areas, there may be a higher proportion of industrial and hazardous waste. Rural areas may have more agricultural and organic waste.

2. Quantity: The amount of solid waste generated can vary depending on the population density, consumption patterns, and economic activities in the area. Urban areas tend to generate larger quantities of waste compared to rural areas due to higher population density and commercial activities.

3. Recycling and Waste Diversion: The extent of recycling and waste diversion practices can vary. Some regions have well-established recycling programs and waste segregation practices, leading to higher rates of waste diversion from landfills. In contrast, other areas may have limited recycling infrastructure, resulting in lower recycling rates.

4. Disposal Methods: The methods used for waste disposal can vary. Common methods include landfilling, incineration, composting, and anaerobic digestion. Developed countries often have advanced waste management systems that incorporate multiple disposal methods, whereas developing countries may rely more on traditional landfilling practices.

5. Legal and Regulatory Framework: The regulations and policies governing solid waste management can differ between regions and countries. Some areas have stringent waste management regulations in place, ensuring proper waste handling, disposal, and environmental protection. In contrast, other regions may have less comprehensive regulations, leading to inadequate waste management practices.

6. Infrastructure and Resources: The availability of infrastructure and resources for waste management can vary. Developed regions generally have better waste management infrastructure, including waste collection systems, recycling facilities, and treatment plants. In contrast, developing regions may face challenges in terms of limited resources, inadequate infrastructure, and financial constraints.

It is important to note that effective solid waste management requires a holistic approach that encompasses waste reduction, recycling, proper disposal, and awareness among individuals and communities. Local governments and authorities play a crucial role in implementing sustainable waste management practices based on the specific needs and circumstances of their respective regions.

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D5W refers to one of the solutions used as an intravenous fluid. It is a 5% by mass solution of dextrose, C6H12O6 in water. The density of D5W is 1.08 g/ml. The molarity of the solution is 0.3 M. Thus, option a is correct.

The formula for molarity is as follows:

Molarity (M) = Moles of Solute ÷ Volume of Solution (in liters).

As a result, let's start by calculating the moles of solute:

Mass (M) = Density (D) x Volume (V)

= 1.08 g/ml x 1000 ml Mass (M) = 1080 g

Since the percentage of dextrose in D5W is 5% by mass, the mass of dextrose in 1000 ml of D5W can be calculated as follows:

Mass of Dextrose = (5/100) x 1080 g Mass of Dextrose = 54 g

Moles of Dextrose = Mass of Dextrose ÷ Molar mass of dextrose

Moles of Dextrose = 54 g ÷ 180 g/mol = 0.3 mol

Molarity (M) = Moles of Solute ÷ Volume of Solution (in liters) = 0.3 mol ÷ 1 L = 0.3 M

Therefore, the molarity of the solution is 0.3 M.  Thus, option a is correct.

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Answer:

New volume V2 = 120.4 ml

Explanation:

Given:

Pressure P1 = 1.12 atm

New pressure P2 = 1.12[1+0.25] = 1.4 atm

Old volume V1 = 150.5 ml

Find:

New volume V2

Computation:

P1V1 = P2V2

(1.12)(150.5) = (1.4)(V2)

V2 = 120.4 ml

New volume V2 = 120.4 ml

Answer:

its D

Explanation:

Took the test

The specie whose concentration is plotted is D. The rate of reaction is how quickly or slowly hat a reaction proceeds.

The term rate of reaction refers to how quickly or slowly hat a reaction proceeds. A reaction rate plot involves the concentration of the species plotted against time.

Now we can see from the plot that concentration is increasing with time. Since the concentration of products increases with time, then the specie whose concentration is plotted is D.

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Answer:

Explanation:

i dont know either but im working on it now, i think that you are supposed to use this equation Q = m * ΔT * Cp once i get the answer ill tell you

Answer:

≈ 76.16%

Explanation:

What is Percent Yield? In chemistry, percent yield is the percent ratio of the weight of the product obtained to the theoretical yield. We calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %.

\(\frac{actual}{theoretical} (100)=percentyield\)  ⇒  \(\frac{278}{365} (100)=76.1643835616\)

≈ 76.16%

hope this helped :)

Answer:

76.16%

Explanation:

I know answer is correct because I got the exact same question :)

Answer:

9 moles

Explanation:

To find out how many moles of compound B are needed to have the same mass as 6.0 mol of compound A, we need to use the molar mass of each compound and set up a proportion:

Moles of A / Molar mass of A = Moles of B / Molar mass of B

We know that the molar mass of compound A is 20 g/mol and that we have 6.0 mol of it, so:

6.0 mol A / 20 g/mol A = Moles of B / 30 g/mol B

Simplifying this equation:

0.3 mol A = Moles of B / 30

Multiplying both sides by 30:

9 mol B = 0.3 mol A

So, we need 9 moles of compound B to have the same mass as 6.0 mol of compound A.

Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells.

Theodor Schwann put forth the classical cell theory in 1839. This theory consists of three parts. All organisms are composed of cells, according to the first section. The basic building blocks of life exists cells, according to the second section.

Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells. He proved that the cell is the fundamental building block of all living things.

All known living things are composed of one or more cells, according to the modern cell theory. By dividing, pre-existing cells become all living cells. All living things have cells as their basic unit of structure and operation.

Therefore, the correct answer is option d) Theodor Schwann did experimentation that demonstrated new cells come from existing, living cells.

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the NaOH concentration is 0.07799 M.

we need to find out the NaOH concentration. For this, we'll use the formula for molarity of a solution. Molarity is defined as moles of solute per litre of solution. The formula for Molarity is:

Molarity (M) = Mass of solute in grams / Molar mass of solute × Volume of solution in liters.

So, we can rearrange the formula as:

M = (m/V) × (1/MW)

where M is the molarity of solution, m is the mass of solute, V is the volume of solution and MW is the molecular weight of the solute. Using this formula, we can calculate the NaOH concentration as follows:

Given, mass of KHP = 0.6986 g

Volume of NaOH = 43.92 mL = 0.04392 L

To find: NaOH concentration

Using the given mass of KHP, we can find the number of moles of KHP as:

moles of KHP = mass / molar mass of KHP= 0.6986 / 204.22= 0.003421 mol

Now, using the balanced chemical equation between NaOH and KHP, we can say that: 1 mole of NaOH reacts with 1 mole of KHP.

This means that the number of moles of NaOH used in the reaction = 0.003421 mol

So, using the formula for molarity, we can say that:

Molarity of NaOH = moles of NaOH / volume of NaOH= 0.003421 / 0.04392= 0.07799 M

Therefore, the NaOH concentration is 0.07799 M.

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Answer: B. Proteins derived from beans have less saturated fat than proteins derived from red meats.

The resulting hydrochloric acid solution will have a pH of 1.52.

The pH of a hydrochloric acid solution is determined by the concentration of hydrogen ions, which is determined by the amount of hydrogen chloride dissolved in the water. 0.30 g of hydrogen chloride dissolved in 4.0 L of water will produce a 0.03 M solution of hydrochloric acid. The pH of this solution can be calculated using the formula:
pH = -log[H+] = -log(0.03) = 1.52

This means that the resulting hydrochloric acid solution will have a pH of 1.52. This is very acidic and can cause significant harm to living tissues. Hydrochloric acid solutions of this concentration are commonly used in industrial and laboratory applications, such as in the preparation of cleaning agents, etching of metals, and for acid-base titrations.
For safety, hydrochloric acid solutions should be handled with caution and used only in the prescribed concentrations. Always make sure to wear protective gear when handling concentrated solutions, as the acid can cause serious injury.

To summarize, the pH of the resulting hydrochloric acid solution is 1.52.

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Answer:

1.892 L. 64 fluid ounces = 1.892 liters (or L)