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The following best describes technology is:
C. the application of engineering to create useful products.
Technology is the application of scientific knowledge to solve practical problems. It is the use of tools, machines, and other methods to do things more efficiently and effectively. Technology can be used to create products, services, and systems that improve our lives.
Engineering is the discipline that applies scientific principles to design and build structures, machines, and other products. Engineers use their knowledge of science and mathematics to solve problems and create new products.
When engineers apply their knowledge to create useful products, they are using technology. For example, engineers used their knowledge of physics and chemistry to create the first computers. They also used their knowledge of engineering to design and build the machines that are used to manufacture computers.
So, technology is the application of engineering to create useful products. It is the use of scientific knowledge to solve practical problems and improve our lives.
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The complete question is:
Which of the following best describes technology
A. Something created for only scientists to use
B. the method of thinking that scientists use.
C. the application of engineering to create useful products.
D. A scientific idea
How many protons neutrons and electrons are present in the 93Nb+3 ion
Final answer:
The 93Nb+3 ion has 41 protons, 52 neutrons (assuming the most common isotope of Nb-93), and 38 electrons.
Explanation:
To determine the number of protons, neutrons, and electrons in the 93Nb+3 ion, we use the periodic table to find niobium's (Nb) atomic number and mass number. The atomic number, which is the same as the number of protons, is 41 for niobium. The ion has a 3+ charge (Nb+3), meaning it has lost 3 electrons compared to the neutral atom. Since the neutral atom has the same number of protons and electrons, the Nb+3 ion has 41 protons and 41 - 3 = 38 electrons.
To find the number of neutrons, we need additional information such as the isotope's mass number. However, this was not provided in the question. Typically, we could use the most common isotope for niobium, which is Nb-93 (mass number 93), where the number of neutrons is the mass number minus the atomic number: 93 - 41 = 52 neutrons.
Assuming the most common isotope and no additional isotopic information, the 93Nb+3 ion contains 41 protons, 52 neutrons, and 38 electrons.
Does a bottle of acetic acid contain a solid or a liquid on a chilly morning with the window open and the laboratory at 10 ∘ C ?
Answer is: a bottle of acetic acid contains a solid.
Acetic or ethanoic acid (CH₃COOH) when undiluted is called glacial acetic acid.
Glacial acetic acid has freezing point (melting point) around 16.6°C, so it will be at solit state.
Vinegar is mixture of acetic acid (CH₃COOH) and water (H₂O). Vinegar is colourless liquid with sour taste and pungent smell, freezing point of the vinegar is lower than glacial acetic acid.
Acetic acid dissociate in aqueous solution to form hydrogen ions (H⁺) and acetic anion (CH₃COO⁻).
Balanced chemical reaction (dissociation):
CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).
Balancing a redox equation by the half-reaction method is based on which of the following actions? A. the transfer of atoms B. the transfer of electrons C. the transfer of hydroxide ions D. the transfer of oxygen molecules
Pretty sure it's the transfer of electrons.
Answer: Option (B) is the correct answer.
Explanation:
A chemical reaction in which there is transfer of electrons between any two species is known as a redox reaction.
For example, [tex]Cu(s) + 2Ag^{+}(aq) \rightarrow Cu^{2+} + 2Ag(s)[/tex]
Oxidation-half reaction: [tex]Cu(s) \rightarrow Cu^{2+} + 2e^{-}[/tex]
Reduction-half reaction: [tex]2Ag^{+}(aq) + 2e^{-} \rightarrow 2Ag(s)[/tex]
Thus, we can conclude that balancing a redox equation by the half-reaction method is based on action of transfer of electrons.
Match the term with the example that shows its definition.
flammability
heat of combustion
toxicity
Compressibility
A) Gasoline catches fire
B) The burning of coal releases heat
C) Gas is squeezed into a small container
D) High lead levels in a lake kill fish
Explanation:
Flammability is defined as the ability of a substance to easily catch fire.
A substance that is poisonous in nature which might even lead to death is known as a toxic substance.
When one mole of a substance oxidizes completely then the heat released is known as heat of combustion.
Compressibility is defined as the ability of a substance to reduce in size.
Hence, we can conclude the terms are matched with the example that shows its definition are as follows.
Gasoline catches fire - flammability.The burning of coal releases heat - heat of combustion.Gas is squeezed into a small container - Compressibility.High lead levels in a lake kill fish - toxicity.density = 7g/ml volume = 10ml
The problem is about calculating mass using the provided density and volume of an object or substance. In physics, mass is determined by multiplying density by volume, resulting in a mass of 70g in this instance.
The subject of this question is tied to the concept of density, a physical property of matter. In physics, we calculate density by dividing mass by volume.
Here, the density is given as 7g/ml, and the volume is stated as 10ml. Using the provided values, you could rearrange the density formula to find the mass.
Mass is calculated by multiplying density by volume, resulting in a mass of 70g.
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Given:
CH4+2O2 - CO2 + 2H2O
in chemical reaction, if 10 moles of H2O are produced, ___?___ moles of CO2 are also produced.
Final answer:
If 10 moles of H2O are produced in the given chemical reaction, CH4 + 2O2 → CO2 + 2H2O, then 5 moles of CO2 are also produced, based on the stoichiometry of the balanced equation.
Explanation:
The given chemical reaction is CH4 + 2O2 → CO2 + 2H2O. This reaction represents the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O).
According to the balanced equation, for every mole of CH4 that reacts, one mole of CO2 is produced and two moles of H2O are produced.
Hence, if 10 moles of water are produced in the reaction, that means that 10 moles of H2O are the result of 5 moles of CH4 completing the reaction since the ratio is 1:2. Therefore, 5 moles of CO2 are also produced, as the ratio of CH4 to CO2 is 1:1.
Is frying an egg chemical or physical change
It is a chemical change
Answer:
Chemical change
Explanation:
Combustibility is pretty much frying and egg and combustibility is a chemical change so :p
You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?
Answer sixteen please
Which of the following would not cause an increase in the pressure inside a sealed container of neon gas?
The pressure in a sealed container means the volume of container is fixed
so we cannot change the volume of container hence gas
The other factors which can affect the pressure are
a) moles of gas : if we increase the moles of gas the pressure of gas will increase
b) Temperature: if we increase the pressure of gas the pressure of gas will increase due to increase in kinetic energy
So the following cannot increase pressure
a) decrease in moles of gas
b) decrease in temperature of gas
Hey there! Your answer is C. Increasing the volume of the container
This is because the container is already sealed, so the volume is fixed.
A compound has an empirical formula of CH2 and a molar mass of 70.15. What is its molecular formula?
Cyclopentane (C5H10)
Explanation:The molar mass of CH2 is about 14.3, Since empirical is a ratio just divide the given molar mass by the molar mass of the empirical. 70.15/14.3=5 So now multiple everything by 5 in the empirical equation.
So, a compound that has an empirical formula of CH2 and a molar mass of 70.15 will have molecular formula of" C5H10".
In the measurement 543.1267 inches which digit is estimated
The total number of digits that are counted while performing a measurement, are called significant figures or significant numbers. In a measured number, all the digits are certain except the last digit. The last digit which is uncertain in a measured number is called estimated digit. In the measurement 543.1267 inches, the last digit 7 is estimated digit. While taking into account the total number of significant figures, we count all the certain digits plus the estimated digit. Therefore, the number 543.1267 has 7 significant figures.
Final answer:
In the measurement 543.1267 inches, the estimated digit is 7 since it's the least significant digit in the sequence and is beyond the smallest marked unit of the measuring tool, thus it must be estimated.
Explanation:
In the measurement 543.1267 inches, the estimated digit is the 7. This is because in any measurement, the last digit that you report is always an estimated digit. The least significant digit is this estimated digit. To understand this concept, consider a ruler which may not have exact markings below a certain decimal place. In such cases, the smallest digit marked on the instrument is known for certain, while the next smallest digit—or the digit beyond the smallest marked unit—is considered to be an estimate.
For example, using a ruler with millimeter markings, if the length measured is between two marks, the measurer can be certain of the millimeters but would estimate the tenths of a millimeter. This principle helps to understand the accuracy of the measurement, which is critical for various scientific and technical applications. Thus, in the given measurement of 543.1267 inches, the digit 7 represents a level of precision that must have been estimated based on the granularity of the measuring tool.
have a region surrounding the central area called
The nucleus of the atom is the region which is surrounded by orbits of electrons around it. The central area of the atom is called as its nucleus which usually contains protons and neutrons in it. These are called subatomic particles of the atom, which includes proton, electron and neutron.
Protons are positively charged species, neutrons are neutrally charged they do not have any charge on it whereas electrons are negatively charged species. The number of protons and electrons is same in a particular specific elemental atom.
Penny has a pencil that is 19 cm long. How long the pencil In inches
Answer : The length of pencil in inches are 7.48 inches.
Explanation :
The conversion used form centimeter to inch is :
[tex]1in=2.54cm[/tex]
As we are given that the length of the pencil is 19 cm. Now we have to determine the length of the pencil in inches.
As, 2.54 centimeter length of pencil = 1 inch
So, 19 centimeter length of pencil = [tex]\frac{19cm}{2.54cm}\times 1inch=7.48inches[/tex]
Therefore, the length of pencil in inches are 7.48 inches.
Penny has a pencil that is 19 cm long. Penny's pencil is 7.48 inches long.
To convert centimeters to inches, use the conversion factor that is 1 inch is equal to 2.54 centimeters.
To find out how long the pencil is in inches, divide the length of the pencil in centimeters by the conversion factor as follows:
Length in inches is equal to the ratio of Length in centimeters to the Conversion factor.
The calculation for length in inches:
Length in inches = 19 cm / 2.54 cm/inch
Length in inches = 7.48 inches
Therefore, Penny's pencil is 7.48 inches long.
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6 atoms of element A combine with 8 atoms of element B to produce 6 compound particles. How many atoms of elemnt A and element B does each particle contain? Are all atoms used to form compounds?
Each compound particle contains 1 atom of element A. However, not all atoms of element B are used, signifying that some are left over after the compounds are formed.
Explanation:In this case, the question is looking at how atoms of element A and element B are combining to form 6 compounds. If we break down the numbers, 6 atoms of A combine with 8 atoms of B to create 6 compound particles. This means that for each compound, there must be 1 atom of element A (6 atoms of A / 6 compounds = 1 atom of A per compound) and roughly 1.33 atoms of element B (8 atoms B / 6 compounds = 1.33), but as we cannot have a fraction of an atom, this suggests that not all atoms of element B are used in the creation of these compounds, perhaps leaving some atoms of element B left over.
For a chemically correct scenario, all participating atoms are usually used up in the formation of compounds unless specified otherwise, illustrating the principle of matter conservation in chemical reactions.
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Each particle contains 1 atom of element A and 1 atom of element B. All 6 atoms of element A and 8 atoms of element B are used to form the compounds.
Explanation:In this compound, 6 atoms of element A combine with 8 atoms of element B to form 6 compound particles. To determine the number of atoms in each particle, we divide the total number of atoms by the total number of particles. In this case, each particle contains 1 atom of element A and 1 atom of element B.
Not all atoms are used to form compounds. In this scenario, all 6 atoms of element A and all 8 atoms of element B are used to form the 6 compound particles.
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Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
B. Scientists hope to learn more about how many stars are in space.
C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.
D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.
Answer:
A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.
Explanation:
As can be seen from the options only first option shows an observation. Here the scientists observed the wobbling of the stars and through that they deduced that there will be planets orbiting around that star. This deductions stands true as the gravity of the planet affects the motion of the star as well. Other options do not show such instances.
define density and erute the formula and units for calculating density
Answer:
m/v
Explanation:
m= mass
v= volume
mass divided by volume
Is mass conserved in a chemical reaction?
yes i think so i think
No, mass is not conserved in a chemical reaction.
Why does a metal spoon left on a bowl of hot soup get warm?
Answer:
The spoon inside the soup bowl heats up due to heat conduction.
Conduction is one of the types of thermal transfer that allows heat to be transmitted from a hot object to a cold one. (from soup bowl to spoon)
In conduction there is no matter transport. What is transferred is heat, which is a form of energy, corresponding to the increase in the kinetic energy of the atom.
Thermal conduction involves the propagation of heat by contact.
(PLEASE HELP ASAP)
To demonstrate the arrangement of atoms in solids, a teacher tapes off a square section on the classroom floor. How should the students modeling as atoms stand or move in the taped-off section?
a. They should leave some vacant space and move around one another.
b. A few students should move about holding hands in one half of the space.
c. They should all squeeze close together so that there is no vacant space.
d. A few students should run randomly in the entire space within the section.
Answer: Option (c) is the correct answer.
Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy. This means that there is very less space between the molecules of a solid substance.
Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy and some vacant space between each molecule.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions and wide spaces between each molecule.
Thus, we can conclude that when the students modeling as atoms stand or move in the taped-off section then they should all squeeze close together so that there is no vacant space.
Alicia cashed her paycheck and used half her earnings to take 3 friends to dinner. She spent $42.15 on dinner and she brought home more than $20.00. write a inequality to represent the situation, using x to represent the amount of alicia check.
Alicia took half of her salary which is $42.15. So the total amount of her salary is $84..30.
Therefore, x-$42.15 ≥ $20.00
$84.30/x ≥$62.15
The amount of Alicia check is [tex]X[/tex].
Amount spent on dinner = [tex]\$42.15[/tex] (given)
Amount brought to home = more than [tex]\$20.00[/tex] (given)
The above information can be written in equation as:
[tex]X - \$42.5 > \$20.00[/tex]
Solving for [tex]X[/tex] as:
[tex]X > \$20.00 + \$42.15[/tex]
[tex]X > \$62.15[/tex]
Hence, inequality to represent the situation is [tex]X > \$62.15[/tex].
If you add water to a 15.00 mL solution of 3.22 M CaCl2 (MM=110.98 g/mol) in order to create a solution that is 15.00% CaCl2 by mass, what is the final mass of the new solution. The density of water is exactly 1.00 g/mL. Assume that the density of the CaCl2 solution is also exactly 1.00 g/mL.
The mass of the new solution is 35.7 g.
Step 1. Calculate the moles of CaCl₂ in the first solution.
[[tex]\text{Moles of CaCl}_{2} = \text{0.015 00 L solution} \times \frac{\text{3.22 mol CaCl}_{2}}{\text{1 L solution }} = \text{0.048 30 mol CaCl}_{2}\\[/tex]
Step 2. Calculate the mass of CaCl₂.
[tex]\text{Mass of CaCl}_{2} = \text{0.048 30 mol CaCl}_{2} \times \frac{\text{110.98 g CaCl}_{2} }{\text{1 mol CaCl}_{2} } = \text{5.360 g CaCl}_{2} \\[/tex]
Step 3. Calculate the mass of the new solution.
[tex]\text{Mass of solution }= \text{5.360 g CaCl}_{2} \times \frac{\text{100 g solution }}{\text{15.00 g CaCl}_{2} } = \textbf{35.7 g solution} \\[/tex]
One example of a chemical change is filtering a mixture, burning wood, boiling water, or crushing a can?
Burning wood is a chemical change.
Among the given options, burning wood is an example of a chemical change as it leads to the formation of new substances, namely, carbon dioxide, water vapor, and ash.
Explanation:The correct option for an example of a chemical change among the given choices is burning wood. Chemical change involves forming new substances with new properties. In the process of burning wood, wood (cellulose) reacts with oxygen in the air to form carbon dioxide, water vapor, and ash, which are completely different substances from the original wood and oxygen. The other three options, filtering a mixture, boiling water, and crushing a can, are physical changes because they do not result in any new substances being formed; they only change the state, shape, or appearance of the substance.
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A teniss ball has more mass than a gold ball because
Whhhhaaaatttt????? A gold ball has more mass because it is a solid and we all know that gold is sssuuuuuuuuppppppeeerr heavy...
So a tennis ball does not have more mass because it is not heavy... I don't know how to say it but it is a solid... but not heavier.
Hope this helps....
Food spoils because of chemical reactions. Many types of spoilage occur because of the actions of microorganisms, such as bacteria. These organisms, like all organisms, rely on chemical reactions within their bodies to carry out their life processes.
Based on this information, what is the most likely reason that refrigerating most foods reduces the rate at which they spoil?
The lower temperature causes foods to expand, increasing the distances between molecules and reducing the reaction rate.
The lower temperature reduces molecule speeds, reducing the number of effective collisions.
The lower temperature causes food to contract, increasing the distances between molecules and reducing the reaction rate.
Answer: The lower temperature reduces molecule speeds, reducing the number of effective collisions.
Almost all food spoils. Most of the spoilage is because of the enzyme activity of microorganisms. Bacteria, which is an example of microorganism, grows rapidly at room temperature or higher temperatures mainly ranging between 40 degrees F to 140 degrees F.
The most commonly used strategy to minimize the rate of food spoilage is to keep it in a cool environment i.e. by refrigerating it. The lower temperature provided to the food slows down the movement of molecules and the number of collisions between them, thus slowing down the rate of enzyme activity.
Answer:
The lower temperature reduces molecule speeds, reducing the number of effective collisions.
Explanation:
Whay type of ion might sodium form?
It is illegal for minor to __________
is luster a physical or chemical property
Luster, the way light interacts with the surface of a material, is a physical property. It describes a characteristic of the material itself, unrelated to chemical reactions. An example is the high luster of diamond due to exceptional light reflection.
Explanation:Luster refers to the way light interacts with the surface of a substance or material, such as a mineral. It is considered a physical property, not a chemical property, because it describes something about the material itself, and not how it reacts with other substances or changes its composition. For example, a diamond has a high luster due its excellent ability to reflect light, which is a quality inherent to the physical structure of the diamond and not related to any chemical reactions.
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THIS IS ON MY UNIT 3 STUDY GUIDE!!!!!!!!!
What is a covalent compound? Write an example.
water is a covalent compound which is formed by the covalent bonding between hydrogen and oxygen atoms.
What type of map should have a north arrow ,key , and map scale?
A political map is a kind of map which contains a north arrow, key and a map scale.
This kind of map usually indicates the governmental boundaries of countries, states, or any counties,
And, they give information about the location of major cities, also they usually include significant bodies of water.
Answer:
Political maps contains north direction, key and scale of map
Explanation:
Map is the two-dimensional representation of the earth showing its various features and locations along with proper latitude and longitude. It has different types of maps, of which the physical maps are widely used. Political maps are those maps in which the countries are separated by distinct boundaries. It is widely used to determine the location of any particular place on earth. It highlights the countries with different colors with various colors excluding blue because the blue color is used to represent the water bodies on earth.
These political maps are comprised of keys, the north direction and the scale of the map.