Which concept accounts for the whole-number subscripts in chemical formulas?.

The volume of a bar of soap that has a density of 2.5 g/cm3 and a mass of 100 g is 40 cm ³. Therefore, option D is correct.

The mass of a substance per unit of volume is its density. A mechanically accepted measure is density. Density is most frequently represented by the symbol, however the Latin letter D may also be used.

The mass of a solid substance's unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

Density = m / V

volume = mass / density

= 100 / 2.5

= 40 cm³

Thus, option D is correct.

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Answer:

masses are constant in chemical reactions

Explanation:

 I assume you are asking why you might get more mass out of a reaction between a metal and an acid with respect to the mass of the metal you put in.......

Metals tend to form salts in acids.......

When  metals form metal oxides, the oxide layer causes the extra mass. When acids reacts with metals, they form their metallic salts.

Metals are electropositive elements. In periodic table, the s block elements and d- block elements are metals. They are electron rich and easily loss one or more electrons from their valance shell.

Metals reacts with nonmetals such as oxygen, nitrogen, carbon etc. by donating electrons to them. Electronegative elements such as oxygen easily reacts with metals forming metal oxides.

Acids reacts with metals with donating the hydrogen ion or proton into the metal. That's why anionic acids are less mass than the acids with the protonated form.

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Answer:

Li3N

Explanation:

Lithium nitride is a compound with the formula Li₃N

Hope this helped!!!

Answer:

C

the next answer is B

the next one is C

Explanation:

Answer: you would use a weak base, as you want to combat acidity but do not want to damage your stomach. an example is tums™ which use carbon carbonate, a base.

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Explanation:

I think Low melting point

because NaCl (salt has mp 801 degC)

Water has mp 0 degC

Salt suitable for sprinkling on food at meals.

In the apparatus of the electrochemical cell, the seawater is an example of an electrolyte.

An electrolyte is a component of the electrochemical cell that is a solution of solvent or water that contains dissolved ions.

The salts of sodium, chloride, and potassium are the main components of seawater and a great electrolyte.

Therefore seawater is an example of an electrolyte.

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Answer:

The main relationship between emerging scientific ideas and open-mindedness is that for many new ideas to be accepted a population has to have an open mind, otherwise the new ideas are rejected without thought.

Explanation:

New scientific concepts are frequently the result of open-mindedness. It wouldn't have achieved scientific acceptance.

A completely new and quickly developing study area with a large scientific effect and a certain level of coherence. The four characteristics of a new research area are therefore radical innovation, rapid expansion, coherence, and scientific significance.

Scientific publications have reported on a developing concept. A new concept cannot develop into a scientific theory or rule. Many scientists have looked into a developing concept.

The Scientific Consensus is the consensus view held by the majority of scientists working in a certain subject at a given moment.

Thus, the new scientific concepts are frequently the result of open-mindedness. It wouldn't have achieved scientific acceptance.

The scientific revolution was the creation of modern science in the early modern era, when advances in biology, medicine, physics, astronomy, mathematics, and chemistry altered perspectives on society and nature.

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Answer:

Hydrogen, H, has an oxidation number of +1 unless it is combined with metals, where it has the oxidation number -1. –Examples – LiH = Li+ H-, BaH2= Ba 2+ H-7. Oxygen usually has the oxidation number -2.

Explanation:

Answer:

\(\% O=24.6\%\)

Explanation:

Hello!

In this case, since the by-mass percent of an element in a compound is computed by taking into account its atomic mass, the number of atoms in the molecules and the molar mass of the compound, we can write:

\(\% O=\frac{2*16.00}{130.18 } *100\%\\\\\% O=24.6\%\)

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The amount of alcohol contained in each of the listed beverages can be compared as follows; 1/2 oz of 80 proof liquor > 5 oz of wine (12% alcohol) > 12 oz of wine cooler (5%alcohol) = 12 oz of beer  (5%alcohol) .

A drink that contains alcohol must be an intoxicating beverage. The extent of intoxication of an alcoholic beverage depends on the amount of alcohol that the beverage contains. There are various types of alcoholic beverages as listed in the question.

The amount of alcohol contained in each of the listed beverages can be compared as follows; 1/2 oz of 80 proof liquor > 5 oz of wine (12% alcohol) > 12 oz of wine cooler (5%alcohol) = 12 oz of beer  (5%alcohol) .

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If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

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The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

The phase of energy metabolism that often begins with the sight, the smell, or even the thought of food is the cephalic phase.

The cephalic phase is the initial stage of digestion and energy metabolism that occurs before food even enters the body. It involves the sensory stimulation of the brain through visual, olfactory, and cognitive cues associated with food.

When we see, smell, or think about food, our brain sends signals to the digestive system, triggering the release of enzymes and hormones that prepare the body for food intake. This phase includes processes such as increased salivation, gastric acid secretion, and pancreatic enzyme release.

The cephalic phase plays a crucial role in preparing the body for efficient nutrient digestion and absorption, ultimately contributing to overall energy metabolism.

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Answer:

what are the gas samples

The sequence of events at the neuromuscular junction is: 1. Arrival of the action potential at the synaptic knob, 2. Release of ACh into the synaptic cleft, 3.Binding of ACh to ACh receptors in the motor end plate, 4.Generation of action potential in sarcolemma, 5.Removal of ACh from the cleft by acetylcholinesterase

The action potential travels down the axon of the motor neuron and reaches the synaptic knob. This causes the release of the neurotransmitter acetylcholine (ACh) into the synaptic cleft. The ACh binds to ACh receptors in the motor end plate of the muscle fiber, which leads to the generation of an action potential in the sarcolemma (muscle cell membrane). The action potential then travels along the sarcolemma and deep into the muscle fiber, causing muscle contraction. Finally, the ACh in the synaptic cleft is rapidly broken down by the enzyme acetylcholinesterase to prevent continuous muscle contraction.

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Answer:

b.) burning paper

Explanation:

Answer: The name of the salt produced is Calcium Sulphate.

Explanation:

we know, whenever an acid reacts with a base, we get a salt and water.

In the given question, Calcium Hydroxide is a base and Sulfuric acid is an acid.

When Calcium Hydroxide reacts with Sulfuric Acid, we get Calcium Sulphate and Water.

The required balanced chemical reaction is:-

Ca(OH)2 + H2SO4 = CaSO4 + 2H2O

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Concept attainment quizzes are designed to assess students' understanding of a particular concept or idea.

These quizzes typically present a series of examples, some of which demonstrate the concept being assessed and others that do not. The student's task is to identify which examples are related to the concept and which are not. This type of quiz can be used to assess understanding of a range of topics, including math, science, social studies, and language arts.

To prepare for a concept attainment quiz, it is important for students to review the key characteristics or attributes of the concept being assessed. They should also familiarize themselves with examples that demonstrate the concept and be able to distinguish between examples that are related and those that are not. Practice quizzes or activities can be helpful in developing these skills.

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Answer:

1.02 (or 1.03 if rounded)

Explanation:

Given 16.4 grams of oxygen gas, you would want to write that down to set up your unit conversions.

16.4 g O2/1 * 1 mol of O2/31.998 g O2 * 2 mol H2O/1 mol O2

Multiply the numbers on the top and divide that by the product of the numbers on the bottom.

16.4 * 1 * 2 = 32.8

1 * 31.998 * 1 = 31.998

32.8/31.998 = 1.025...

Don't forget to consider the number of significant figures if it asks!

Chemicals in these torches are combining with chemicals in the air because of their reactivity.

When a chemical is reactive, it means it has a strong tendency to undergo chemical reactions with other substances, which can result in the formation of new compounds. In the case of torches, the chemicals being burned are reacting with oxygen in the air to produce light and heat. This process is known as combustion, and it involves a complex series of chemical reactions. The specific chemicals involved in the reaction will depend on the type of fuel being burned, but in general, reactive chemicals are essential for torches and other combustion-based technologies to function.

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Answer:

0.45

Explanation:

(a) Diagram of characteristic X-ray generation in an atom:

[Note: Due to the limitations of text-based communication, I'm unable to provide a visual diagram. However, I'll explain the process in the following text.]

(b) Explanation of characteristic X-ray generation:

When high-energy electrons collide with an atom, they can knock out inner shell electrons, creating vacancies. Outer shell electrons then transition to fill these vacancies, releasing energy in the form of X-rays. These X-rays are called characteristic X-rays and have specific energies corresponding to the energy differences between different electron shells.

(c) X-ray production in an X-ray tube:

An X-ray tube consists of a cathode and an anode enclosed in a vacuum. The cathode emits a stream of high-speed electrons through a process called thermionic emission. These electrons are accelerated by a high voltage and directed towards the anode. As the fast-moving electrons collide with the anode, X-rays are produced through two main processes: bremsstrahlung radiation (braking radiation) and characteristic X-ray emission.

In bremsstrahlung radiation, the electrons are decelerated by the positively charged anode, causing them to emit X-rays with a continuous spectrum of energies. Characteristic X-ray emission occurs when the high-speed electrons displace inner shell electrons in the anode, leading to the generation of characteristic X-rays specific to the anode material.

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CH3CH2OOC(O)C4H7 is an answer. The structure of the transesterified 5-ethylfuran-2(5H)-one can be represented as CH3CH2OOC(O)C4H7, where the -OR group is replaced by -OCH2CH3.

Transesterification is a process in which the ester functional group in a molecule is replaced by another alcohol functional group. In the given reaction scheme, R"OH and R'OH represent the alcohol molecules that are involved in the reaction. When 5-ethylfuran-2(5H)-one reacts with an alcohol, such as CH3CH2OH, it undergoes transesterification, resulting in the formation of a new ester. The reaction occurs via the breaking of the ester bond in 5-ethylfuran-2(5H)-one and the formation of a new ester bond between the alcohol and the carbonyl carbon in the molecule. This reaction is commonly used in organic chemistry for the synthesis of esters with different alcohol functional groups.

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Answer:

The reactants of photosynthesis are Carbon Dioxide and water. The products are Glucose (or starch/sugar) and Oxygen. The autotroph uses light energy from the sun in order to complete this process. In the formula, the arrow is the light energy.

Explanation:

Answer:

I've inserted an image.

Explanation:

Hope this helps!

(:

Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

The largest mass percentage of nitrogen in NO. Therefore, option (A) is correct.

The percentage by mass of an element in a chemical compound can be described as the number of parts by mass of the element contained in 100 parts by mass of a chemical compound.

The mass percentage of an element can be determined in two steps:

First, calculate the molar mass of the compound and then the percentage of each element by dividing the total mass of the element present in the compound by the molecular mass of the compound multiplied by 100.

Given, the molecular formula of the compound is NO.

The molecular mass of the NO = 30 g/mol

The mass percentage of the Nitrogen = (14/30) × 100 = 46.67 %

the molecular formula of the compound is NO₂.

The molecular mass of the NO = 46 g/mol

The mass percentage of the Nitrogen = (14/46) × 100 = 30.4 %

the molecular formula of the compound is N₂O.

The molecular mass of the NO = 44 g/mol

The mass percentage of the Nitrogen = (14/44) × 100 = 31.81 %

the molecular formula of the compound is N₂O₃.

The molecular mass of the NO = 76 g/mol

The mass percentage of the Nitrogen = (28/76) × 100 = 36.84 %

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Answer:

There are 7 carbons in 2,3 dimethylpentane

Explanation:

Because 2,3-dimethlypentane is an organic compound of carbon and hydrogen with formula C7H16

Answer:

Since there's only 1 hour before your next dose, you skip the missed ... It happens when bacteria adapt to withstand one or more antibiotics.

Explanation:

Answer:

The answer would probably be C. The clock can be seen and heard.

Molar concentration of Sodium chloride (NaCl) means the number of moles of sodium chloride present in 1L of water.

Molar mass of NaCl = Molar mass of Na + Molar mass of Cl

Molar mass of NaCl = 23 + 35.5

Molar mass of NaCl = 58.5g

∴ 1L of water contains 55.55 moles of water. Hence,

Mass of ocean water = 55.55 × 18 = 999.9g

Since, 1L of ocean water has a mass of 999.9g of which 3.5% is the salt.

hence, (999.9) (0.035) = 34.99g

So, No. of moles of NaCl = Mass of NaCl / 58g NaCl per mol

No. of moles of NaCl = 34.99/58.5

No. of moles of NaCl = 0.59 moles

So, Molar concentration or Molarity would be 0.59 moles present in 1L of solution.

Hence, Molarity or Molar Concentration = Moles of NaCl/ Volume of solution (in L)

Molarity = 0.59/1L

⇒ Molarity = 0.59M

Hence, the molarity is 0.59M

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