An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?A) An atom that contains 12 protons and 13 neutrons. B) An atom that contains 13 protons and 12 neutrons. C) An atom that contains 12 protons and 25 neutrons. D) An atom that contains 25 protons and 12 neutrons.
Answer: The correct answer is Option A.
Explanation:
An atom consists of 3 subatomic particles: Electrons, neutrons and protons.
Atomic number is equal to the number of electrons or number of protons.
Atomic number = Number of electrons = Number of protons ....(1)
Mass number is the sum of number of protons and number of neutrons.
Mass number = Number of protons + Number of neutrons .....(2)
We are given:
Atomic number = 12
Mass number = 25
From equation 1:
Number of protons = Number of electrons = 12
From equation 2:
Number of neutrons = 25 - 12 = 13
Thus, an atom contains 12 protons and 13 neutrons.
Hence, the correct answer is Option A.
Containers of ice cream are sold by volume, not by weight. Some ice cream manufacturers pump air into the ice cream before packaging it. Why does this practice make the ice cream more expensive to the consumer?
A) Air weighs more than ice cream does.
B) Air weighs less than ice cream does.
C) After air is pumped into ice cream, the mixture occupies a greater volume than the ice cream alone did.
D) After air is pumped into ice cream, the mixture occupies a smaller volume than the ice cream alone did.
In the game of economics, goods are objects that fulfill peoples needs and ____.
Goods are objects that fulfill peoples needs and wants.
You should know the location of safety equipment
in the laboratory and
1. use or test it once a month.
2. where it is produced.
3. use or test it once a week.
4. how to use it properly
which is a model that shows only the valence electrons of an atom?
The AWNSER i think is c and do you use time4learning
The electrons in the outermost shell, or energy level, of an atom are Valence electrons. Electron dot model is a model that shows only the valence electrons of an atom, i.e., option C.
What is an electron dot model?Because valence electrons are so crucial, atoms are frequently represented by simple diagrams that only show their valence electrons.
These are known as electron dot diagrams. Also referred to as Lewis structures.
Electron dot model is a model that shows only the valence electrons of an atom.
Thusm the correct option is C.
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science question down below
Which element had the longest effect on human history?
In the chemical laboratory why do scientists use a mortar and pestle
Answer:
to increase surface area or A
Explanation:
4. What does the data mean for people involved in farming and agriculture?
Answer:
There are several benefits farmers and owners of agribusinesses.
It is often said that one cannot manage what they can't measure. Data helps farmers manage with better efficiency their operations. They can make more tailored decisions with respect to their farm’s specific needs if they have more information.When data is obtained and analysed, it generates information. The information obtained can help farmers identify efficiencies that lead to higher productivity and profitability, lower input costs, and optimise use of important farm input such as fertiliser and feed.Data help farmers reduce the risks associated with their operations. One of such risks is Market risks. If a farmer has adequate information about how a particular product is performing in the market with respect to demand and trends, it helps them plan production in such a way that they don't over produce thus creating a surge in supply which can lower prices. This is also beneficial to a farms supply chain relationships or network.Cheers!
What is the dependent and independent variable for the sentence "Different rose bushes are grown in a greenhouse for 2 months. The number of flowers on each bush is counted at the end of the experiment.
Critique the following statement: "Any time a scientific theory is challenged, it means it's not a good theory."
Challenging a scientific theory is an essential part of the scientific process, not an indication of a theory's weakness. Theories are meant to be falsifiable and robust, able to withstand scrutiny and adapt to new evidence. Criticism and challenge signify the self-correcting nature of science.
The statement "Any time a scientific theory is challenged, it means it's not a good theory" is a misconception about the nature of scientific inquiry. In science, challenging theories is fundamental to scientific progress.
When a theory is challenged, it does not necessarily mean the theory is weak or incorrect; rather, it's an opportunity to test the robustness of the theory. Scientific theories are built to be falsifiable, meaning that they can be tested against observations and experiments. If a theory cannot be falsified, it's not considered a strong scientific theory.
When we encounter data that contradicts a theory, it's critical to examine this data critically. Sometimes, after scrutiny, the data may not be credible, but other times it can lead to a theory being revised or replaced. A revolutionary scientific theory is often not accepted until it has undergone rigorous testing and scrutiny, potentially replacing an older theory. Valid criticism and challenges to a theory, rather than indicating poor quality, demonstrate the self-correcting nature of the scientific method.
Moreover, the progress of science involves improving upon or discarding theories when new evidence arises. In this sense, science has no sacred ideas that cannot be challenged.
The strength of a scientific model lies in its ability to withstand challenges and adapt to new data. If a theory does not fit within the observed data or if new information arises that contradicts the theory, it is the standard scientific practice to either modify the theory or develop a new one that better explains the phenomena.
five years ago, my grandfather was five times as old as I was. Three years from now, my grandfather will be three times as old as I will be. how old am I now?
How many moles are in 110 grams of NaHCO3?
Final answer:
There are approximately 1.31 moles of NaHCO3 in 110 grams of the compound. This is calculated by determining the molar mass of NaHCO3 and then dividing the mass by the molar mass.
Explanation:
To calculate the number of moles in 110 grams of NaHCO₃ (sodium bicarbonate), we need to follow these steps:
First, we determine the molar mass of NaHCO₃ by adding the atomic masses of its constituent elements: Na (sodium), H (hydrogen), C (carbon), and O (oxygen).Therefore, there are approximately 1.31 moles of NaHCO₃ in 110 grams of the compound.
Which part of the atom has to stay the same for it to be the same element? a) number of neutrons b) number of protons c) number of electrons d) number of protons, neutrons, and electrons
A sample contains 430 mg of mercury. How many significant figures are in the number?
The andromeda galaxy is located approximate 2.5 million light-years from earth. Why is the light that Reaches earth 2.5 million years old
Which is the balance equation for S8+O2=SO2
In two or more complete sentences, explain how to balance the combustion equation: ___C5H12 + ___O2 ⟶ ___CO2 + ___H2O
PLEASE HELPPPPP!!!!
Answer: [tex]C_5H_{12}+8O_2\rightarrow 5CO_2+6H_2O]/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.
[tex]C_5H_{12}+O_2\rightarrow CO_2+H_2O]/tex]
The balanced equation will be :
[tex]C_5H_{12}+8O_2\rightarrow 5CO_2+6H_2O]/tex]
how might a scientist confirm the result of other experiments by doing an experiment?
Answer:
The correct answer will be- repetition of the experiment ensures the validity and truthfulness of the results.
Explanation:
In the scientific community, the repetition of the experiment using the same procedure by the same researcher or another researcher plays an important role.
The repetition of the experiment is done to test and verify the results which could be doubtful or fraud. The experimental results of another experimenter act as evidence which if similar supports the experiment and help ensure the validity of the experiment.
Thus, the repetition of the experiment ensures the validity and truthfulness of the results is the correct answer.
if you mix together 50 mL of a strong acid and 50 mL of a strong base what would yo predict the pH of the new solution wouod be
If you mix together 50 mL of a strong acid and 50 mL of a strong base what would yo predict the pH of the new solution would be 7. Because it neutralized the solution.
What is pH ?The pH scale, which previously stood for "potential of hydrogen," is used to describe how acidic or basic an aqueous solution is. The pH values of acidic solutions are lower than those of basic or alkaline solutions.
At 25 °C, the pH of pure water (H20) is 7, but when this equilibrium is subjected to atmospheric carbon dioxide, the pH of the water decreases to about 5.2 because the airborne CO2 dissolves in the water and produces carbonic acid.
Thus, If you mix together 50 mL of a strong acid and 50 mL of a strong base what would yo predict the pH of the new solution would be 7. Because it neutralized the solution.
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What is the function of a hypothesis in the scientific inquiry process?
the density of gold is 19.3 g/cm^3. You inherit a gold bar that measures 7.0 in by 3.0 in by 2.0 in. How many ounces does the bar weigh? Express answer in scientific notation.
To find the weight of the gold bar, we need to calculate its volume and use the density of gold. The gold bar weighs approximately 467.96 ounces.
Explanation:To find the weight of the gold bar in ounces, we first need to calculate its volume in cubic inches and then convert it to cubic centimeters.
Given:
Length = 7.0 inchesWidth = 3.0 inchesHeight = 2.0 inchesThe volume (V) of a rectangular prism is given by V = Length x Width x Height.
V = 7.0 in x 3.0 in x 2.0 in = 42.0 in³
Since 1 inch is equal to 2.54 centimeters, we can convert the volume to cubic centimeters:
V = 42.0 in³ x (2.54 cm/in)³ = 686.98 cm³
Now, to find the weight of the gold bar in ounces, we can use the density of gold, which is 19.3 g/cm³.
The formula for density is Density = Mass/Volume.
Since we know the density and the volume, we can rearrange the formula to solve for the mass:
Mass = Density x Volume
Mass = 19.3 g/cm³ x 686.98 cm³ = 13,257.814 g
Finally, to convert the mass from grams to ounces, we divide by 28.35 grams/ounce:
Weight in ounces = 13,257.814 g / 28.35 g/oz = 467.96 oz
Therefore, the gold bar weighs approximately 467.96 ounces.
In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this
What is the group number of the most nonmetallic group that contains metalloids? What is the group number of the most metallic group that contains metalloids?
What is the group number of the most nonmetallic group that contains metalloids?
16
What is the group number of the most metallic group that contains metalloids?
13
Explanation:
Metalloids are the substances which show properties of both metals and non-metals.
The left side of periodic table contains metals and on moving towards the right there are non-metals. Between the metals and non-metals there are metalloids.
Group 16 is the most non-metallic group that contains metalloids. In group 16, O, S, and Se are non-metals whereas Te and Po are metalloids.
Group 13 is the most metallic group that contains metalloids. In group 13, Al, Ga, In and Tl are all metals whereas boron is a metalloid.
Your teacher gives you a black powder. When you dissolve the powder in water, you see red particles that float to the top, black particles that sink to the bottom, and a green liquid. Was the black powder a pure substance, mixture, element, or compound? compound element pure substance mixture I think it is A
Answer: Option (a) is the correct answer.
Explanation:
A substance that cannot be broken down into simpler substances is known as an element.
For example, a piece of sodium metal contains only atoms of sodium.
Whereas a compound is defined as a substance that contains two different elements which are chemically combined together in a fixed ratio by mass.
For example, LiCl is a compound in which atoms are present in 1:1 ratio.
A compound is able to dissociate into its constituent particles but an element cannot.
Both an element and a compound are pure substances.
A mixture is defined as a substance in which two or more number of different substances are mixed together. Particles of a mixture never combine chemically to each other.
So, when black powder on coming in contact with water dissociates as red particles that float to the top, black particles that sink to the bottom, and a green liquid. Then it means a chemical reaction has taken place.
Hence, we can conclude that the black powder is a compound.
When this element was discovered, it exhibited luster and malleability, and it reacted very vigorously with water. This element is never found as a free element in nature and always exists in a compound. To which group does this element most likely belong?
The element likely belongs to Group 1: The Alkali Metals, which are characterized by their luster, malleability, and vigorous reaction with water. They are never found free in nature and always exist in compounds.
The element described is likely to belong to Group 1: The Alkali Metals. These elements exhibit luster and malleability, and they react vigorously with water, typically forming alkaline solutions. They are never found as free elements in nature due to their high reactivity, particularly with water and oxygen in the air, and are always found in compound form.
Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium, each having a single electron in their outermost shell, which is very easily removed during chemical reactions making them very reactive.
What is the difference between Boron (B) and Neon (Ne).
( Please answer correctly and not asking me to look on google)
the correct formula for aluminum phosphide
students calculated the circumference of a globe to be 60.0 cm. The actual circumference of the glide is 63 cm. The percent deviation of the students calculation was. 1. 0.48% 2. 2.8% 3. 5.0% 4. 21%
Answer: The correct answer is Option 2.
Explanation:
To calculate the percentage error, we use the equation:
[tex]\%\text{ error}=\frac{|\text{Experimental value - Actual value}|}{\text{Actual value}}\times 100[/tex]
We are given:
Experimental value of circumference = 60.0 cm
Actual value of circumference = 63 cm
Putting values in above equation, we get:
[tex]\%\text{ error}=\frac{|60.0-63|}{63}\times 100\\\\\%\text{ error}=4.8\%[/tex]
Hence, the correct answer is Option 2.
Look at the distance vs. age plot. Describe the relationship between age and distance and explain how it supports or does not support your hypothesis. Think about: As the distance from Kilauea increases, what happens to the age of the volcanoes/mountains?
Final answer:
The distance vs. age plot is expected to show a positive correlation if the Pacific Plate is moving over a stationary hotspot, with older volcanoes/mountains being farther from Kilauea. A lack of pattern, like in the Line Islands, suggests a complex tectonic history. Correlation analysis and topographic and tectonic interpretations are pivotal in examining volcanic activity and age-distance relationships.
Explanation:
The relationship between the age of volcanoes/mountains and their distance from Kilauea can be determined by analyzing a distance vs. age plot. As the distance from Kilauea increases, we generally expect the age of the volcanoes/mountains to increase as well, if the hypothesis that the Pacific Plate is moving over a stationary hotspot is correct. A positive correlation between distance and age would support this, suggesting that the older features are farther away from the current hotspot location because they were formed first and have been carried away by the plate motion over time.
Conversely, if there is no clear pattern or relationship between age and distance, it could indicate a more complex tectonic history, as suggested by the Line Islands, which do not show a clear age-distance relationship. This lack of pattern could be due to different tectonic movements or the presence of multiple hotspots, as opposed to a single, stationary hotspot. The concept of correlation, which can be positive or negative, is crucial in interpreting such geologic data. As demonstrated in the example with Old Faithful's eruptions, where there's a positive correlation between eruption duration and the time between eruptions, we can use similar methods to determine the age-distance relationship.
Critical thinking about the topography and tectonic history can provide insights into why one area might have larger volcanic eruptions compared to another. Factors such as rift zones, plate boundaries, and hotspots might influence the eruption style and magnitude.