Answer:
proton and electrons orbit close together around a center nucleus
Answer:
a
Explanation:
How many moles are in 2.47 x 10^22 molecules of H2O
Need to divide by Avogadro’s number which is 6.022*10^23
(2.47 * 10^22 molecules)/(6.022*10^23 molecules) = 0.041 mole
To find the number of moles in 2.47 x 10^22 molecules of water, divide the number of molecules by Avogadro's number (6.02 x 10^23). The result is approximately 0.0410 moles.
Explanation:The subject of your question is in the field of Chemistry, specifically in stoichiometry and the mole concept. You're interested in finding the number of moles in 2.47 x 1022 molecules of H2O (water). To tackle this, we use Avogadro's number, which states that one mole of any substance contains 6.02 x 1023 particles (atoms, molecules, ions, etc.).
To solve this, you divide the number of molecules by Avogadro's number:
2.47 x 1022 molecules / 6.02 x 1023 molecules/mole = 0.0410 moles.
So, there are roughly 0.0410 moles in 2.47 x 1022 molecules of H2O.
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Molecules in a gas don’t stick together, so they can’t form drops as a liquid does. How could you compare two different gases to determine which gas particles are more strongly attracted to each other?
For ideal gas, there is no attraction between its molecules. But for real gas molecules, there are attractive forces in between molecules. Those are called Van der Waals forces.
To determine which gas particles are more strongly attracted to each other, you can compare two different gases at constant pressure but different temperatures. Because of the Van der Waals forces, the increase in volume due to temperature will be smaller than what is predicted by the ideal gas law. The larger the difference from the ideal gas law's prediction, the larger the intermolecular attractive force is.
Answer:
Explanation:
another way to look at it - for gases within the same group, the larger the attractive force, the closer the gas molecules can get together; i.e. the higher the gas density.
for example, for Group VII Halogens gases, the further down the gas, the higher its gas density: I2 > Br2 > Cl2 > F2. The Van der Waal force is also dependent on the gas masses. That means higher gas density indicates stronger attractive force.
A reaction between an acid and a base produced lithium chloride (LiCl). What acid and base combination could produce this salt?
A - sulfuric acid and lithium hydroxide
B - hydrochloric acid and lithium hydroxide
C - sulfuric acid and magnesium hydroxide
D - hydrochloric acid and magnesium hydroxide
Answer: The answer is B hydrochloric acid and Lithium hydroxide
Explanation:
A reaction between B - hydrochloric acid and lithium hydroxide produced lithium chloride.
A reaction between an acid and a base is called neutralization. A salt is formed, which contains the cation provided by the base and the anion provided by the acid.
A reaction between an acid and a base produced lithium chloride (LiCl). What acid and base combination could produce this salt?
A - sulfuric acid and lithium hydroxide. NO. Sulfuric acid provides the sulfate anion. B - hydrochloric acid and lithium hydroxide. YES. C - sulfuric acid and magnesium hydroxide. NO. Sulfuric acid provides the sulfate anion and magnesium hydroxide the magnesium cation. D - hydrochloric acid and magnesium hydroxide. NO. Magnesium hydroxide provides the magnesium cation.A reaction between B - hydrochloric acid and lithium hydroxide produced lithium chloride.
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Which of the following measures thermal energy in an object?
Volume
Heat
Mass
Temperature
i am confused
heat or temperature
but according to me the answer is heat
Answer: temperature
Explanation:
Thermal energy is the energy possessed by an object by virtue of its temperature. The hotter the substance, the more its molecules vibrate, and therefore the higher its thermal energy.
Thermal energy refers to the sum of kinetic, potential, vibrational ,electronic and rotational energies of the object.
Heat is the thermal energy which is transferred from a body at higher temperature to a body at colder temperature.
Temperature of an object is the measure of hotness or coldness of n object.
1. Air contains mostly nitrogen (78%) and oxygen (21%). It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids). Write a brief explanation about why air is a mixture, whether it is homogeneous or heterogeneous, and how it can be separated into its components.
Air is a mixture of gases (and some dust) because the gases (oxygen, nitrogen, carbon dioxide, etc.) do not combine chemically into other compounds. Just like a mixture of salt & pepper doesn't combine into some other thing.
The mixture is homogenous if it consists only of gases. If dust is mixed in the mixture is heterogeneous (dust is solid matter, gas is gas) A heterogenous mixture is one of different types of matter.
Separating one gas from the other is different for each gas and a complicated matter.
Answer: Air is a homogeneous mixture of gases.
Explanation: Mixture is a composition in which 2 or more substances are present together without making a chemical bond or a chemical compound between them.
Thus Air qualifies itself as mixture because there are several number of gases present in different composition and different proportions. These gases do not combine with each other to form a chemical compound between them.
Homogeneous mixture is the mixture in which the phase of the mixture is just single phase and it is not possible to separate the components. Thus Air is a homogeneous mixture and its component can never be separated because it forms a single phase.
Wavy bands of light and dark minerals visible in gnesis bedrock probably formed from the ?
1) cementing together of individual minerals grains
2) cooling crystallization of magma .
3) evaporation of an ancient ocean.
4) heat and pressure during metamorphism
it is number 4 heat and pressure during metamorphism
If a gas has a volume of 1000 ML at a temperature of 23°C and a pressure of 100 mmhg, what is it’s volume under standard conditions of temperature and pressure?
Answer:
119.7 mL.
Explanation:
From the general law of ideal gases:PV = nRT.
where, P is the pressure of the gas.
V is the volume of the container.
n is the no. of moles of the gas.
R is the general gas constant.
T is the temperature of the gas (K).
For the same no. of moles of the gas at two different (P, V, and T):P₁V₁/T₁ = P₂V₂/T₂.
P₁ = 100.0 mmHg, V₁ = 1000.0 mL, T₁ = 23°C + 273 = 296 K.P₂ = 1.0 atm = 760.0 mmHg (standard P), V₂ = ??? mL, T₂ = 0.0°C + 273 = 273.0 K (standard T).∴ V₂ = (P₁V₁T₂)/(T₁P₂) = (100.0 mmHg)(1000.0 mL)(273.0 K)/(296 K)(760.0 mmHg) = 121.4 mL.
Calculate the percent of Cl in KClO4
Answer:
25.6 %.
Explanation:
To calculate the % of Cl in KClO₄:% Cl = [Atomic mass of (Cl)/molar mass of KClO₄] x 100 = [(35.5 g/mol)/(138.55 g/mol)] x 100 = 25.62 % ≅ 25.6 %.
FIRST ONE TO ANSWER GETS BRAINLIEST!!!!!! HELP!!!
According to current scientific thinking, how did the solar system that contains earth form?
Answer:
The dust and gas particles of a slowly rotating nebula gradually came together to form a cloud with a huge central bulge surrounded by a flat ring of dust and gas. The sun was formed from the material in the bulge. The flat ring became several rings. In each ring, a planet formed and continued to revolve around the sun in the plane of the ring it came from.
Explanation:
please help!!! Which of the following describes a response to external stimuli ?
a. A boy sneezes when exposed to a cat dander.
b. A girl eats food when she is hungry.
c. A child becomes hyperactive do to a chemical imbalance.
d. A person yawns when oxygen levels in the blood are low.
Answer: Saliva, sweat, pee, and dander (dead skin cells) can all trigger allergies. Pet fur also traps mold, pollen, and other outdoor allergens that make you sneeze and your eyes water.
Explanation:
Answer:
A
Explanation:
PLEASE HELP ASAP ONE MORE QUESTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following is a direct result of technological advances in farming techniques?
A.
The United States can produce enough food to feed all the people in the world.
B.
The average life expectancy in the United States is beginning to decrease.
C.
Heart disease is the leading cause of death in industrialized countries.
D.
The percent of the population with type II diabetes has increased in the past few decades.
A. The United States can produce enough food to feed all the people in the world. is your best answer, and is the only logical answer.
It is the only answer that actually has the word "food" in it, and is a direct result of farming technological advances.
~
Match the terms to their definition.
1. centi-
Finding the size, quantity, or amount by comparing with a standard.
2. decimal system
Prefix meaning one-hundredth (.01).
3. kilogram
A system of numeration that is based on units of 10.
4. kilo-
The basic measure of mass in the metric system.
5. liter
Prefix meaning one thousand (1,000).
6. measurement
The basic measure of volume in the metric system.
1. Centi
Prefix meaning one-hundredth (.01).
2. Decimal system
A system of numeration that is based on units of 10.
3. Kilogram
The basic measure of mass in the metric system.
4. Kilo
Prefix meaning one thousand (1,000).
5. Liter
The basic measure of volume in the metric system.
6. Measurement
Finding the size, quantity, or amount by comparing with a standard.
Please find the explanations in the document.Final answer:
The terms centi-, decimal system, kilogram, kilo-, liter, and measurement are related to the metric system, used for specifying measurements using prefixes like centi- for one-hundredth and kilo- for one thousand. These prefixes help in measuring various sizes using the decimal system.
Explanation:
The terms to be matched with their definitions are related to the metric system and its units of measurement. Here is the matched list:
Centi-: Prefix meaning one-hundredth (.01).
Decimal system: A system of numeration that is based on units of 10.
Kilogram: The basic measure of mass in the metric system.
Kilo-: Prefix meaning one thousand (1,000).
Liter: The basic measure of volume in the metric system.
Measurement: Finding the size, quantity, or amount by comparing with a standard.
A metric ruler is a common tool for measuring metric lengths such as millimeters and centimeters. Metric prefixes such as centi- and kilo- simplify the process of measurement by providing a range of units that correspond to various powers of ten. This means larger or smaller quantities can be measured efficiently, using suitable units like centimeters for small lengths and kilometers for large distances.
Given 6.98 x 10 4 power grams of iron, calculate the moles of iron present
Answer:
1249.88 mol.
Explanation:
∵ no. of moles of Fe = mass of Fe/atomic weight of Fe.
∴ no. of moles of Fe = (6.98 x 10⁴ g)/(55.845 g/mol) = 1249.88 mol.
Inferences are A. never made by scientists. B. questions that are made by studying conclusions or predictions. C. exactly the same as observations. D. conclusions or predictions that are made by studying observations.
The Answer Is D. Have A Great Day
which of these can be classified as a substance A) oxygen B) carbon dioxide C) air D) acid rain
D could be a answer
Answer:
carbon dioxide
Explanation:
the rest are mixtures
A chemical substance is composed of one type of atom or molecule.
Difluoromethane has the formula CH2F2- this compound can be classified as
A.) covalent,because it contains carbon and hydrogen
B.) ionic, because it contains Fluorine ions
C.) covalent because it contains only nonmetal
D.)ionic, because it contains both hydrogen (a metal )and nonmetals
The answer is C because it is between nonmetals
The reactants side of an equation is shown. How many silver atoms should the products side of the equation have after a chemical reaction?
2 A g 2 O
⟶
?
3
2
1
4
I was thinking 2 but im not sure.
A water molecule is made up of two hydrogen (H) atoms and one oxygen (O) atom. In a chemical equation, what would be the correct way to represent six water molecules?
6 H (2) O
H (12) O (6)
6 H (2) O (2)
2 H (6) O (3)
6H(2)O?
someone help me , quick
When you ride a bicycle, several things happen that require energy and it's transformation. You pedaling the bike is transforming chemical energy, supplied by the breakdown of the food you eat, into mechanical energy to turn the pedals. The chemical energy is potential and the mechanical energy is kinetic.
How do forces in nuclear and chemical reactions differ
Nuclear reactions involve changes in the nucleus of an atom, while chemical reactions involve a transfer or sharing of electrons. The energies released in nuclear reactions are much greater than those in chemical reactions. Nuclear reactions are not affected by changes in environmental conditions, unlike chemical reactions.
Explanation:Nuclear reactions differ from chemical reactions in several ways. In chemical reactions, atoms become more stable by participating in a transfer or sharing of electrons. On the other hand, nuclear reactions involve changes in the nucleus of an atom, resulting in the production of a different element. The energies released in nuclear reactions are much greater than those involved in chemical reactions. Additionally, nuclear reactions are not significantly affected by changes in environmental conditions, such as temperature or pressure.
In France, grapes are 1.75 Euros per kilogram. What is the cost of grapes in dollars per pound if the exchange rate is 1.36 dollars to 1 Euro? ( Hint: covert 1 until at a time.) ( Remember: 1 1b =454g)
Answer:
$1.08/lb
Explanation:
You want the cost in dollars per pound of grapes that cost €1.75 per kg, given the exchange rate €1 = $1.36.
Unit conversionWe can multiply by a ratio that cancels units we don't want and leaves units we do want.
[tex]\dfrac{1.75 \text{ euro}}{1\text{ kg}}\times\dfrac{0.454\text{ kg}}{1\text{ lb}}\times\dfrac{\$1.36}{1\text{ euro}}\approx\boxed{\$1.08\text{ per lb}}[/tex]
Koolaid is a solution. What is the solute? What is the solvent?
Solute: koolaid mix , Sugar
Sovlent: water
Water acts as a solvent in our Kool-aid, dissolving the sugar plus Kool-aid powder. A solute plus a solvent make up a solution.
What is solution?A solute plus a solvent make up a solution. The thing that dissolves in the solvent is called the solute. Solubility is the measure of a solute's ability to dissolve in a solvent. For instance, salt is the solute and water is the solvent in a saline solution.
The chemicals present in lesser concentrations are solutes, whilst the substances present in greater abundance are the solvent in solutions with components within the same phase. In the case of air, the solutes are the gases of oxygen and carbon dioxide, while the solvent is the gas of nitrogen. Water acts as a solvent in our Kool-aid, dissolving the sugar plus Kool-aid powder.
Therefore, water acts as a solvent in our Kool-aid, dissolving the sugar plus Kool-aid powder.
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How does an atom-88 become a strontium ion with a +2 charge?
Strontium atom loses 2 electrons to become an ion with 2 electrons lesser than its atom. Your answer is C.
Heat always travels from ________ to
A)hot, cold.B)cold, hot.C)least dense, most dense.D)low energy, high energy.
Hey there!
The correct answer is A. Hot, Cold
Heat always travels from HOT to COLD
Hope this helps you!
God bless ❤️
xXxGolferGirlxXx
Heat always travels from hot to cold, the answer is A.
How many grams of NaNo3 are required to saturate 200 grams of water at 10 degrees Celsius
Answer:
162.0 g.
Explanation:
The solubility is the maximum amount of solute dissolved in a given amount of solvent to form saturated solution.The solubility of NaNO₃ in 100.0 g of water at 10.0°C is 81.0 g/ 100 g water.
Using cross multiplication:
81.0 g of NaNO₃ form saturated solution at 10.0°C in → 100.0 g of water.
???? g of NaNO₃ form saturated solution at 10.0°C in → 200.0 g of water.
∴ The grams of NaNO₃ form saturated solution at 10.0°C in 200.0 g of water = (81.0 g)(200.0 g)/(100.0 g) = 162.0 g.
Answer:
I belive it would be 162.0 grams
Explanation:
how will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?
A: it is tripled to three times its original volume
B:it is decreased to one third of its original volume
C:it is decreased to 3L less than its original volume
The answer is B. When you increase the pressure, you compress the gas to a fraction of its original volume.
I would decrease by a third of the orgin. volume.
The moon accelerates because it is _____.
continuously increasing its speed of orbit
constantly increasing the diameter of its orbit
in a vacuum in space
continuously changing direction
please answer fast!!
The answer for your question is the first one
The moon accelerates because it is continuously increasing its speed of orbit
Describe a protein molecule.
Answer:
Explanation:
Proteins are made up of amino acids. Amino acids are the simply the monomeric units of proteins. An amino acid is bifunctional in that it carries an amino group(-NH₂) and a carboxyl group(-COOH) attached to a carbon atom in a molecule.
Amino acids can form long polyamide chains that makes up proteins. A peptide bond binds an amino group of the first amino acid molecule with the carboxyl group of the second amino acid molecule.
Proteins are high polymers made up of one or more peptide chains.
When 412.5g of calcium carbonate react with 521.9g of aluminum fluoride,how many grams of each product can be produced
321.8 g CaF2
321.5 g Al2(CO3)3
Explanation;The equation for the reaction is;
3 CaCO3 + 2 AlF3 → 3 CaF2 + Al2(CO3)3
Number of moles of CaCO3 will be;
=(412.5 g CaCO3) / (100.0875 g CaCO3/mol)
= 4.12139 mol CaCO3
Number of moles of AlF3 will be;
= (521.9 g AlF3) / ( 83.9767 g AlF3/mol)
= 6.21482 mol AlF3
But;
4.12139 moles of CaCO3 would react completely with 4.12139 x (2/3) = 2.74759 moles of AlF3.
Thus; there is more AlF3 present than that, so AlF3 is in excess, and CaCO3 is the limiting reactant.
Therefore;
Mass of CaF2 will be;
(4.12139 mol CaCO3) x (3/3) x (78.0752 g CaF2/mol) = 321.8 g CaF2
Mass of Al2(CO3)3 on the other hand will be;
(4.12139 mol CaCO3) x (1/3) x (233.9903 g Al2(CO3)3/mol) = 321.5 g Al2(CO3)3
When 412.5 g of calcium carbonate reacts with 521.9 g of aluminum fluoride, approximately 322.1 g of CaF₂ and 345.5 g of Al₂(CO₃)₃ can be produced.
The reaction is:
CaCO₃ + AlF₃ → CaF₂ + Al₂(CO₃)₃
First, let's write the balanced equation:
3CaCO₃ + 2AlF₃ → 3CaF₂ + Al₂(CO₃)₃
Now, let's calculate the number of moles of each reactant:
n(CaCO₃) = 412.5 g / 100.09 g/mol = 4.12 mol n(AlF₃) = 521.9 g / 83.98 g/mol = 6.22 mol
Since the reaction requires 3 moles of CaCO₃ for every 2 moles of AlF₃, the limiting reactant is CaCO₃.
Now, let's calculate the number of moles of each product:
n(CaF₂) = 4.12 mol (CaCO₃) × (3 mol CaF₂ / 3 mol CaCO₃) = 4.12 mol n(Al₂(CO₃)₃) = 4.12 mol (CaCO₃) × (1 mol Al₂(CO₃)₃ / 3 mol CaCO₃) = 1.37 mol
Finally, let's calculate the mass of each product:
m(CaF₂) = 4.12 mol × 78.07 g/mol = 322.1 g m(Al₂(CO₃)₃) = 1.37 mol × 258.99 g/mol = 354.5 g
So, 322.1 g of CaF₂ and 354.5 g of Al₂(CO₃)₃ can be produced.
Every cell in the body needs oxygen for a chemical reaction called what?
cellular respiratory.
Hope that helps! :)
Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.
(text multiple choice) nonmetallic oxide + base → salt +
The non-metal oxides can be neutralized with a base to form a salt and water.
Non-Metal Oxide + Base → Salt + Water
For example,
SO3(g) + Ba(OH)2(aq) → BaSO4(aq) + H2O(l)
P4O10(s) + 12 NaOH(aq) → 4 Na3PO4(aq) + 6 H2O(l)
The non-metal oxides can be neutralized with a base to form a salt and water.
Non-Metal Oxide + Base → Salt + Water
For example,
SO3(g) + Ba(OH)2(aq) → BaSO4(aq) + H2O(l)
P4O10(s) + 12 NaOH(aq) → 4 Na3PO4(aq) + 6 H2O(l)
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