The molar mass of NaCl is 23 + 35.5 = 58.5 g/mol, so the mass of the sample ia 0.78 × 58.5 = 45.63 g.
There is 45.58 grams of NaCl in 0.78 moles
What are moles ?Moles is a measurement unit in Chemistry for measuring large number of molecules and atoms.
1 mole is equal to 6.022 * 10²³ atoms
It is calculated by dividing mass of the molecule/compound by Molar mass of the substance.
Mass of 1 mole of a substance = Molar mass of the substance
0.78 moles of NaCl = ? grams
1 mole of NaCl means 58.44 grams.
0.78 moles = 0.78 * 58.44
0.78 moles of NaCl = 45.58 grams of NaCl
Therefore there is 45.58 grams of NaCl in 0.78 moles.
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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.
When an organism is finished growing, which of the following best describes what happens on the cellular level? A. Its cells stop reproducing. B. Its cells reproduce and die at the same rate. C. Its cells stop growing. D. Its cells grow and shrink at the same rate.
When an organism is finished growing, its cells stop growing at a cellular level. In multicellular organisms, most cells become terminally differentiated and no longer divide.
Explanation:When an organism is finished growing, its cells stop growing at the cellular level. This means that cells no longer increase in size or mass.
For example, in multicellular organisms like humans, once an individual reaches adulthood, most of their cells are considered terminally differentiated, meaning they have entered a phase called Go and no longer divide.
In contrast, during the growth phase, cells reproduce and divide to increase the number of cells in the organism.
Final answer:
Cells in an organism that has finished growing B. reproduce and die at the same rate. This balance occurs in the stationary phase and is due to factors like resource depletion and waste accumulation.
Explanation:
When an organism has finished growing, the process that best describes what happens on the cellular level is that the cells reproduce and die at the same rate. During the stationary phase, there is no overall change in population size because cell division is equivalent to cell death. This happens when resources such as nutrients and oxygen are depleted, and waste products build up.
When the body has reached its full size, cell reproduction generally does not occur except where it is necessary for tissue repair, such as in healing wounds. Nevertheless, cells still go through the G1 and G2 stages wherein materials are acquired and biomolecules are synthesized that can later be divided between two daughter cells. In multicellular organisms, once growth is complete, cell reproduction is supposed to cease except for necessary instances like injury repair.
Which type of technology is used to map the ocean floor?
Echo Sounding is the technology used to map the ocean floor.
What is Echo Sounding ?This method was developed by German Scientist , In this different frequency of sound is used to determine different objects below the sea surface.
The ships having transducers which emit and receive sound waves in form of cone are used .
After projection of sound , depending upon the depth of the ocean the projection will be created on the ocean floor , which will echo back to the transducers after amplification to record and manipulate the data.
The depths are calculated as the time sound takes to reach through the ocean and back.
Therefore , Echo Sounding is the technology used to map the ocean floor.
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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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In which of the following is the number of electrons the ion contains given correctly
Answer:
B. K+ has 18 electrons
Explanation:
Ions are formed when atoms of element gain or loose electrons.When an atom looses electrons it forms a positively charged ion and when an atom gains electrons it forms a negatively charged ion.Metal atoms such as potassium, magnesium and aluminium looses outer most electrons to positively charged ions.Potassium atom has 19 electrons, 19 protons, with an electronic configuration of 2 : 8 : 8 : 1. To form an ion, K looses an electron to form a positively charged potassium ion (K+) with 18 electrons and 19 protons and an electronic configuration of 2:8:8.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.
The reaction shifts toward the product gas.
Ammonia is consumed in the reaction.
The system reacts by increasing the number of gas molecules.
The pressure on the gases decreases momentarily.
Answer:Amonia is consumed in the reaction.
Explanation:
According to the Le-chatieler principle by decreasing the volume on reactant side the products(amonia) will collide and will shift the reaction to the reverse side ,hence the amonia is consumed.
An atom has at least one positive proton and at least one negative electron. Which of the following is true about the protons and electrons in an atom?
A.
Protons and electrons are far apart with empty space in between.
B.
Protons and electrons are stuck together in neutral pairs.
C.
Protons and electrons orbit close together around a central nucleus.
D.
Protons and electrons are mixed together in a cloud.
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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How much heat is released when 47.50 g of CH4 (g) is burned in excess oxygen gas to produce carbon dioxide and water?
Answer:
= 2113.44 kJ
Explanation:
When 1 mole of CH4 (g) burns in excess oxygen -714.0 kJ of heat is released.
For 47.50 g;
molar mass of CH4 = 16.042 g/mol
Number of moles of CH4
= 47.5 g /16.042 g/mol
= 2.96 moles
Therefore;
1 mole = -714.0 kJ
Heat change for 2.96 moles
= 2.96 moles × -714.0 kJ
= 2113.44 kJ
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 %.
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.
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:
What is the wavelength of radio waves? A. between 1 x 10-3 and 1 x 10-1 meters B. less than 1 x 10-11 meters C. more than 1 x 10-1 meters D. between 1 x 10-8 - 4 x 10-7 meters E. between 4 x 10-7 - 7 x 10-7 meters
Answer:
The correct answer option is C. more than 1 x 10-1 meters.
Explanation:
A wavelength is the distance between the successive crests of a wave.
A type of electromagnetic (EM) radiation is called radio waves which have wavelengths that are longer than infrared light in the electromagnetic spectrum.
The wavelength of the radio waves is approximately more than 1 x 10-1 meters.
Therefore, the correct answer option is C. more than 1 x 10-1 meters.
Answer:
More than 1 × 10⁻¹ meters
Explanation:
Wavelength is defined as the distance between the successive crests and the successive trough of a wave.
Radio waves are the type of electromagnetic radiation that have longest wavelength in the electromagnetic spectrum. This wave travel with the speed of light. The wavelength of radio waves is 10³ meters.
So, the wavelength of radio waves i.e. more than 10⁻¹ meters. Hence, the correct option is (c).
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
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.
balanced forces cannot accelerate an object
True
False
True Balance forces can not change the motion or direction of an object.
Question : Balanced forces cannot accelerate an object true or false?
It would be true based on the change of the motion cannot change the motion as well as the direction of the object that is for the balanced forces.
Hopefully this helps you ! have a good evening !
If heat is released from water vapor, what phase change occurs? A) liquid to gas B) solid to gas C) liquid to solid D) gas to liquid
D) Gas to liquid. Vapor would be a gas, and in the process of releasing heat, it turns back into a liquid.
ANSWER: D: GAS TO LIQUID
EXPLANATION: Water vapor is already in a gas form because it is vapor. Anytime heat is released from a gas, it will change forms to be a liquid. It is like reverse condensation.
What element is this? How do you know?
This element is Helium. This is because it has two protons and two neutrons in its nucleus. this makes it have the atomic mass of approximately four atomic mass units. It also has two electrons in the first energy level. . It is therefore a noble gas since this is the only energy level and it obeys the 2n² rule for the filling of energy levels. n in this case is 1 making the maximum number of electrons in the first energy level to be 2.
(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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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:
What does an eco psychologist study
Ecopsychology is what it sounds like: a hybridization between the field ofpsychology (the study of human behavior and the soul) and that of ecology (the relationship of organisms to one another and to their physical surroundings1). studies the relationship between a person's mental health and the environment.
which of the following is an example of how a scientist might use a model
A. Marbles placed inside a hollow sphere are used to describe protons in a nucleus
B. Stopwatches measure the amount of time it takes for runners to complete a mile
C. Microscopes are used to magnify a group of cells on sets of slides
D. A wrench is used to tighten a nut onto a piece of wood
A. Marbles placed inside a hollow sphere are used to describe protons in a nucleus.
it would be A because the other options are just the tools used in an experiment and A is actually using other objects
Scientific modeling has been the process of using charts and tables to represent ideas. It can be used to show marbles placed inside the hollow sphere to show the proton arrangement. Thus, option A is correct.
What are scientific models?Scientific modeling has been defined as the use of graphical and conceptual topics, systems, ideas, and processes to understand and identify patterns based on scientific knowledge. It allows a better understanding and explanation of the topic.
Marbles used to describe the proton arrangement inside the hollow sphere are the best example of scientific modeling as it uses marbles to represent protons with a positive charge to show their arrangement inside the nucleus of the hollow atom.
Therefore, option A. marbles placed inside the sphere show scientific modeling.
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What is one characteristic of a sample of matter that indicates it is a pure substance?
A)It can be separated using by a physical means, such as filtering.B)The components in a pure substance do not have to be in definite ratios.C)If the composition of a sample varies, the sample is a pure substance.D)If the composition of a sample is fixed, the sample is a pure substance
Answer:
D
Explanation:
If the composition of a sample is fixed, the sample is a pure substance. According to the law of definite proportions (constant composition), components of a pure substance must be in definite ratios regardless of the source.
How many moles of barium chloride are needed to produce 105.8 g of aluminum chloride?
The answer would be 0.0861 moles
Final answer:
To find the moles of aluminum chloride from a given mass, you must use its molar mass. With a mass of 105.8 g and a molar mass of 133.33 g/mol, you get 0.794 moles of aluminum chloride. Additional information is needed to directly involve barium chloride in the calculation.
Explanation:
To determine how many moles of barium chloride are needed to produce 105.8 g of aluminum chloride, we'll need to consider the stoichiometry of the reaction. However, based on the information provided, there seems to be a possible error as barium chloride does not directly react to form aluminum chloride in a simple exchange reaction. Instead, we'll determine the moles of aluminum chloride (AlCl3) from its mass and molar mass.
First, calculate the molar mass of AlCl3:
Al: 26.98 g/mol
Cl: 35.45 g/mol × 3 = 106.35 g/mol
The molar mass of AlCl3: 26.98 g/mol + 106.35 g/mol = 133.33 g/mol.
Now use this to find the moles of AlCl3:
(105.8 g AlCl3) / (133.33 g/mol) = 0.794 moles of AlCl3.
Assuming a typical synthesis reaction where aluminum reacts with chlorine, the stoichiometry would be 2 Al + 3 Cl2 → 2 AlCl3. For every 2 moles of AlCl3 produced, you would need 2 moles of Al and 3 moles of Cl2. Any additional information such as the reaction involving barium chloride would be needed to provide a more specific answer involving barium chloride.
when fossils fuels are burned what is their chemical potential energy converted into?
The chemical potential energy is converted into electrical energy.
When burned, the chemical potential energy of fossil fuels is converted into thermal and light energy. This transformation occurs through the combustion process, creating carbon dioxide and water while releasing heat. Fossil fuels represent a way of storing energy from ancient sunlight, transformed over millions of years under high pressure and temperature.
Explanation:When fossil fuels such as coal, oil, and natural gas are burned, their chemical potential energy is primarily converted into thermal energy (heat) and light energy. The process of burning is essentially a chemical reaction where these fuels combine with oxygen (O2) to form carbon dioxide (CO2) and water (H2O), releasing energy in the form of heat. This energy release results from breaking the higher energy bonds in the hydrocarbon molecules of the fossil fuels and forming the lower energy bonds of the combustion products.
Fossil fuels are considered a form of long-term storage of energy that originated from ancient sunlight. Through photosynthesis, living organisms such as plants, algae, and photosynthetic bacteria captured solar energy, which then became chemically stored in the organic matter that, under high pressure and temperature over millions of years, transformed into the various types of fossil fuels we use today. This process indicates why fossil fuels are seen as non-renewable energy sources, as the accumulation of such fuels took an extremely long time and cannot be quickly replicated.
It is not possible for global warming to have any positive side effects. Please select the best answer from the choices provided T F
False. For example, changing climates will mean that some areas that experience harsh weather will soon being to experience milder weather. :)
Answer: True
Explanation:
Global warming is a natural phenomena associated with increase in the global temperatures worldwide due to abundance of greenhouse gases in the atmosphere. These greenhouse gases like carbon monoxide, carbon dioxide, nitrogen dioxide are added into the atmosphere by the human activities like burning of fossil fuels and deforestation. It is concerned with many negative side effects like melting of glaciers, loss of biodiversity due to increase in global heat, increase in incidences of human diseases like asthama, hypertension.
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.
What does the map show about the Earth 225 million years ago ?
About 225 million years ago, the earth contained a single landmass; called Pangaea. That landmass was divided into two landmasses, viz. Laurasia and Gondwana Land; about 200 million years ago. ... The Gonwana Land included the modern day India, Australia, South America, South America and Antarctica.
Answer:
It shows Pangaea.
Explanation:
The map about the Earth 225 million years ago shows the supercontinent Pangaea, in which present-day continents were located close to each other. At that time, plants and animals were moved freely over all of the continents. Pangaea was centred on the Equator and surrounded by the superocean Panthalassa.
what atom is 10ne20
[tex]^{20}_{10}\text{Ne}[/tex].
That's a neon-20 atom.
ExplanationHere's the symbol of neon-20, showing both its atomic number and its mass number.
[tex]^{20}_{10}\text{Ne}[/tex].
Ne is the chemical symbol of neon. The number 20 in the upper-left corner is the mass number of this atom.The number 10 in the lower-left corner is the atomic number of this atom.How to name this atom?
Start with the name of the element: "neon" for Ne, atomic number 10.Write a hyphen: "-" with no space around.Write the mass number: "20" right next to the hyphen.What about the atomic number? The atomic number is unique for each element. It is implied in the first part of the name. For example, the atomic number of a "neon-20" atom is always going to be 10 since the atomic number of neon is 10. That number is printed on the periodic table. However, the mass number may vary between isotopes of each element. That number needs to be specified.
The name of this atom is neon-20.