When energy is changed from one form to another

Answer:6.022×1023 water molecules

Explanation:

The calculation shows that 3.5 moles of water contain 2.1077 x 10²⁴ molecules.

To answer the question, we need to use Avogadro's number, which is 6.022 x 10²³ molecules per mole.

Write the given quantity and the desired quantity.

Write the conversion factor using Avogadro's number.

Set up the dimensional analysis equation to cancel out units and solve:

There are 2.1077 x 10⁴ molecules in 3.5 moles of water.

Answer: Given equal masses, water will heat up less than wood if the same heat is added.

Answer:

The correct answer is c

Answer:

value of x is -4 to solve 8=2×+4

Answer:

x=-4

Explanation:

just took test

Answer:

What reaction is balanced

Answer:

c

Explanation:

got it right on assignment

Final answer:

A net ionic equation reflects only the participating ions in a chemical reaction, omitting the spectators. For HCl reacting with NaOH, it is H+(aq) + OH−(aq) → H₂O(l). For AgNO₃ reacting with NaCl, it is Ag+(aq) + Cl−(aq) → AgCl(s).

Explanation:

What is a Net Ionic Equation?

The net ionic equation shows the chemical equation that includes only the reacting ions in a solution and omits the spectator ions. Spectator ions are those that do not participate directly in the chemical reaction and which remain in the solution unchanged. This simplification helps to focus on the actual chemical change taking place. For example, if we consider the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH), we start with the complete ionic equation:

H+(aq) + Cl−(aq) +Na+(aq) + OH−(aq) → H₂O(l) + Na+(aq) + Cl−(aq)

In this reaction, sodium ions (Na+) and chloride ions (Cl−) are spectator ions, as they do not change during the reaction. We can remove them to obtain the net ionic equation, which demonstrates the actual chemical change:

H+(aq) + OH−(aq) → H₂O(l)

Similarly, if we were to use a different example such as the precipitation reaction between silver nitrate (AgNO₃) and sodium chloride (NaCl), the net ionic equation would be:

Ag+(aq) + Cl−(aq) → AgCl(s)

This representation highlights the formation of silver chloride precipitate from the reacting ions, omitting the spectator sodium (Na+) and nitrate (NO₃−) ions.

Final answer:

The statement that covalent compounds form crystals is TRUE in the context of covalent network crystals, such as diamond or quartz, but FALSE when referring to typical molecular compounds, which exist as discrete units but can also form molecular crystals held by weaker forces.

Explanation:

The statement 'Covalent compounds form structures called crystals' can be both TRUE and FALSE depending on the context. Unlike ionic compounds, which are known for their crystal lattice structures, molecules of covalent compounds typically exist as discrete units. However, there are also covalent network crystals, such as diamond and quartz, where atoms are covalently bonded in a continuous three-dimensional network, forming a crystalline structure. Additionally, there are molecular crystals that do not form a covalent network but are held together by weaker intermolecular forces.

Atoms arrange themselves into lattices to form a crystal because of a net attractive force between their constituent electrons and atomic nuclei. These crystalline structures are categorized into ionic, covalent, and metallic, based on their bonding. It's important to distinguish between molecular crystals and covalent network crystals when discussing covalent compounds in crystal structures.

The relative energies and forces that hold crystals together are case-dependent, with factors like ionic sizes and stoichiometries influencing the structure of ionic crystals. Covalent network crystals have very high melting and boiling points, are hard and brittle, and do not conduct electricity because they are composed of atoms, not ions.

Answer:False

Explanation:

It’s false

Answer:

0.60 mol H₂

General Formula and Concepts:

Chemistry - Gas Laws

Ideal Gas Law: PV = nRT

Explanation:

Step 1: Define Variables

P = 1.4 atm

T = 430 K

R = 0.0821 (L · atm)/(mol · K)

V = 15.1 L

n = unknown

Step 2: Solve for n

Step 3: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

0.598816 mol H₂ ≈ 0.60 mol H₂

Final answer:

Approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

Explanation:

To calculate the amount of hydrogen gas necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

n = (1.4 ATM) * (15.1 L) / (0.0821 L*ATM/(mol*K)) * (430 K)

Simplifying the equation yields:

n = 0.26796 mol

Therefore, approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

Answer:

C. slightly basic

Explanation:

0-7 = acidic

7 = neutral

7-14 = basic

- Since the pH is just over 7, the answer would be slightly basic.

- Hope this helps! Please let me know if you need a further explanation.

The human blood having a pH between 7.35 and 7.45 simply means the blood is slightly basic.

The correct answer to the question is Option C. slightly basic.

The pH of a solution is simply a measure of the acidicity or alkalinity of the solution.

The pH scale ranging from 0 to 14 gives a discription of the acidicity or alkalinity of a solution as follow:

0 to 6 => acidic

7 => Neutral

8 to 14 => Basic

From the question given above,

The pH of the blood reads between 7.35 and 7.45.

This simply implies that the human blood is slightly basic as the pH reading of the blood is a little above the neutral mark (i.e 7) of the pH scale.

Therefore, Option C. slightly basic. gives the correct answer to the question.

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Answer:

d. less energy required

Explanation:

it said it in my book and i took the edg quiz

The answer is C. Potassium and D. Lithium.

The correct answers to which elements have an oxidation number of 1 are C. Potassium and D. Lithium, as both are group 1 alkali metals that typically form ions with a +1 charge.

Both potassium and lithium belong to the group 1 elements of the periodic table, also known as the alkali metals. These metals typically have a +1 oxidation state when forming compounds. Potassium (K) for example, readily loses one electron to form a K+ ion, also known as a monovalent cation. Similarly, lithium (Li) will also lose one electron to form an oxidation state of +1.

Magnesium (Mg) and Calcium (Ca), on the other hand, form ions with a 2+ charge, indicating an oxidation state of +2. For instance, in [tex]MgCl_2[/tex], magnesium has an oxidation number of +2. Therefore, options A. Magnesium and B. Calcium do not have an oxidation number of 1 and are not correct answers to the question.

This is an incomplete question, here is a complete question.

Phosphorus trifluoride is formed from its elements.

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

How many grams of fluorine are needed to react with 6.20 g of phosphorus?

Answer : The mass of [tex]F_2[/tex] needed are, 11.4 grams.

Explanation : Given,

Mass of [tex]P_4[/tex] = 6.20 g

Molar mass of [tex]P_4[/tex] = 124 g/mol

Molar mass of [tex]F_2[/tex] = 38 g/mol

First we have to calculate the moles of [tex]P_4[/tex]

[tex]\text{Moles of }P_4=\frac{\text{Given mass }P_4}{\text{Molar mass }P_4}[/tex]

[tex]\text{Moles of }P_4=\frac{6.20g}{124g/mol}=0.05mol[/tex]

Now we have to calculate the moles of [tex]F_2[/tex]

The balanced chemical equation is:

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

From the balanced reaction we conclude that

As, 1 mole of [tex]P_4[/tex] react with 6 moles of [tex]F_2[/tex]

So, 0.05 moles of [tex]P_4[/tex] react with [tex]0.05\times 6=0.30[/tex] moles of [tex]F_2[/tex]

Now we have to calculate the mass of [tex]F_2[/tex]

[tex]\text{ Mass of }F_2=\text{ Moles of }F_2\times \text{ Molar mass of }F_2[/tex]

[tex]\text{ Mass of }F_2=(0.30moles)\times (38g/mole)=11.4g[/tex]

Therefore, the mass of [tex]F_2[/tex] needed are, 11.4 grams.

The mass of F2  that should be required to react with 6.20 g should be 11.4 grams.

Since

Mass of P4 is 6.20g

The molar mass of P4 is 124 g/mol.

And, the molar mass of F2 is 38 g/mol.

Now the moles of P4 is

= Given mass / molar mass

= 6.20/124

= 0.05 mol

Now the moels of F2 is

= Moles of P4 * 6

= 0.05 * 6

= 0.30 moles

So, here the mass is

= Moles of F2 * molar mass of F2

= 0.30 * 38

= 11.4 grams

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Answer:

[tex]\large \boxed{\text{5.40 mol}}[/tex]

Explanation:

[tex]\text{Moles of water} = 3.25 \times 10^{24}\text{ molecules} \times \dfrac{\text{1 mol }}{6.022 \times\ 10^{23} \text{molecules}} = \textbf{5.40 mol}[/tex]

Answer:Flowing water creates energy that can be captured and turned into electricity. ... The most common type of hydroelectric power plant uses a dam on a river to store water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.

Explanation:

Answer:

The protection of internal environment from the harms of fluctuations in external environment is termed as homeostasis.

Explanation:

Homeostasis is the central requirement in the maintenance of an organism, which compels the adaptations in the constant changing condition and contribute in evolutionary process.

Maintaining homeostasis is crucial for all organisms to regulate their internal environment, adapt to environmental changes, and ensure their survival. A loss of homeostasis can cause diseases and negatively impact an organism's health.

Maintaining homeostasis is essential for the survival and well-being of all organisms. Homeostasis refers to the ability of an organism to regulate its internal environment, irrespective of changes in external conditions. This function is carried out by a myriad of biological processes and systems; for example, thermoregulation helps maintain a constant body temperature, and osmoregulation helps control the water and ion concentrations.

Exhibiting a lack of homeostasis can lead to great physiological stress and might be detrimental to the organism's survival. For example, in humans, a deviation from homeostasis can cause diseases such as diabetes, where the body fails to regulate blood glucose levels.

In conclusion, maintaining homeostasis is fundamentally important as it assures that all organisms can adapt to environmental changes, ensuring their survival and continued growth and development.

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Answer: 9.5

Explanation:

The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

It is defined as moles of solute in certain volume of Solvent.

The units of Molarity is mol/L or Molar(M)

Molarity = moles of solute /  Volume of Solvent

It is given that a 2.5 L , 3.8 M solution

Let n be the number of moles needed

M = n/V

Substituting the values in the equation

3.8 =  n /2.5

n = 3.8 * 2.5

n = 9.5 moles

Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

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Answer: By going solar, you can reduce demand for fossil fuels, limit greenhouse gas emissions, and shrink your carbon footprint

Explanation:

Answer:keep feet dry, avoid sharing things, wear cotton socks. That’s all

Answer:

7.875 grams

Explanation:

You multiply 175 g by .045

This gives you 7.875 grams of lactose

Final answer:

The mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, is 7.875 grams.

Explanation:

Mass is a fundamental physical quantity that represents the amount of matter in an object. It is a scalar quantity, meaning it has magnitude but no direction. Mass is typically measured in units such as kilograms (kg) or grams (g). In classical mechanics, mass plays a crucial role in determining an object's inertia, which is its resistance to changes in motion.

To calculate the mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, you can use the following formula:

Mass of lactose = (Percentage of lactose by mass) × (Total mass of the milk)

Mass of lactose = 0.045 × 175 g = 7.875 g

Therefore, the mass of lactose present in 175 g of milk is 7.875 grams.

Answer:

Explanation:

1. Get a pillow

2. Find a bed or a couch

3. Get a comfy blanket

4. SLEEP

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the formula for the number of moles can be given as

number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

number of atoms of oxygen=4.5 x 10²⁴atoms

Substituting all the given values in the above equation, we get

number of atoms of oxygen=(4.5 x 10²⁴)/(6.02 x 10²³)

number of atoms of oxygen= 7.475 mole

Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

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Answer:

D

Explanation:

the stuff being dissolved when making a solution

it is dissolved in the solvent

Answer:

Gases

Explanation:

Answer:

gases

Explanation:

because gases have less particles then water and solids

Answer:

electromagnetic radiation

Explanation:

I had a quiz abt it

Answer:

Explanation:

but what is it.

Answer:

6 CO2 + 6H2O produces 1 C6H12O6 + 6O2

Explanation:

  I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.

A solid sample of oil is warmed until it turns into a liquid. Density is the  property of the oil will decrease.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

As temperatures rose, the density of all oils decreased. The temperature coefficients of density change differed slightly between oils. The density differentials between oil and water, as well as their temperature coefficients, varied significantly between oils.

Oil is denser than alcohol but denser than water. Because the molecules that make up oil are larger than those that make up water, they cannot pack as tightly as water molecules can. They occupy more space per unit area and have a lower density.

Thus, Density is the  property of the oil will decrease.

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Answer:

Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction. ... A mixture is made by simply mixing together elements and compounds. No new chemical bonds are formed

compounds containing two elements

sodium chloride

zinc sulfide

aluminium oxide

compounds containing three elements

potassium nitrate

copper carbonate

Answer:

i.

Mixture are made up of element that are not chemically bonded. (eg. In the air, containing O2, H2, N2 but jot mized together)

Compounds are made up of 2 or more type of atoms that are chemically bonded. (e.g CO2, H20)

ii.

Compound containing 2 elements :

Compound containing 3 elements :

Answer:

Explanation:

it is important for cattle ranchers to understand the basics of chemistry because feeding and health of their valuable animals rely in the principles of chemical science.

Understanding what elements or compounds animal food must contain for the animals grow better is an esential part of animal husbandry.

The same can be said about the vitamins, drugs, antibiotics, and medicines in general, needed by the livestock to be healthy and cure diseases.

Chemistry involves the study of the substances, their propeties, and how to combine them (chemical reactions) which is the basis of the nutritrion and medicine; two essential parts of cattle breeding.