subatomic matter is not the smallest unit of matter, but its definetely smaller than atom. fernions which form subatomic particles is the smallest unit of matter.
An atom is the smallest unit of matter. It is the smallest component of an element that still has the properties of that element. Atoms are made of three particles. protons, neutrons, and electrons.
define density and erute the formula and units for calculating density
Answer:
m/v
Explanation:
m= mass
v= volume
mass divided by volume
Which best describes the primary function of the nervous system in keeping the body in homeostasis
HEY BUDDY THE ANSWER IS
It processes the environment and sends out signals.
The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions through negative feedback mechanisms.
Explanation:The primary function of the nervous system in keeping the body in homeostasis is to monitor and regulate internal conditions. This is done through a process called negative feedback. When there is a change in the internal environment, the nervous system detects the change and sends signals to various organs and tissues to make adjustments and return the body to its optimal state.
For example, if the body temperature starts to rise, sensors in the skin and internal organs send signals to the brain. The brain then sends signals to the sweat glands to produce sweat and cool down the body. This helps maintain a stable body temperature, which is necessary for the proper functioning of the body.
In summary, the nervous system plays a crucial role in maintaining homeostasis by constantly monitoring and regulating internal conditions through negative feedback mechanisms.
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Which of the following statements is true about the nucleus?
A -The strong nuclear force and the residual strong force hold the nucleus together.
B- Only neutrons hold the nucleus together.
C- The presence of neutrons, the strong nuclear force, and the residual strong force hold the nucleus together.
D- Only the strong nuclear force holds the nucleus together.
C - The presence of neutrons, the strong nuclear force, and the residual strong force hold the nucleus together.
is true about the nucleus
The correct statement is C. Neutrons play a crucial role in stabilizing the nucleus by providing additional binding energy without introducing electrical repulsion. The strong nuclear force, which acts between nucleons (protons and neutrons), is responsible for overcoming the electromagnetic repulsion between protons and binding the nucleus together.
Additionally, the residual strong force, also known as the nuclear force, is responsible for holding the nucleons together within the nucleus. These combined forces act to maintain the stability and integrity of the nucleus, ensuring its cohesion despite the repulsive forces between positively charged protons.
Therefore, statement C accurately describes the factors involved in holding the nucleus together.
Why is the use of road salt in winter impractical in many northern communities?
The use of road salt in winter is impractical in many northern communities because the temperatures can be too low for the salt to do its job.
Salt lowers the melting point of ice, but it loses its effectiveness when the temperatures drop below about -15 °C.
The winter temperatures in Winnipeg, Canada often drop below -30 °C. Road salt has no effect on ice at those temperatures.
Road salt, such as NaCl and CaCl₂, is used to lower the freezing point of water to prevent ice formation on roads and sidewalks. However, its effectiveness is limited in extremely cold temperatures, where it may not sufficiently depress the freezing point, and environmental concerns may make its use impractical.
The use of road salt in winter is a common practice in many regions to combat ice formation on roads and sidewalks. Salt such as sodium chloride (NaCl) or calcium chloride (CaCl₂) is spread because it lowers the freezing point of water, a phenomenon known as freezing point depression. This ensures water does not freeze as easily and reduces the risk of accidents due to slippery surfaces.
However, the practicality of using road salt in some northern communities diminishes as temperatures drop significantly below the effective range of these salts. For example, at temperatures around -35°C, even if salt is applied, the freezing point of water won't be sufficiently depressed to prevent ice from forming. This is because the solubility of the salts decrease with decreasing temperature, limiting their effectiveness. Additionally, environmental concerns such as the potential harm to aquatic life in urban streams may discourage the use of road salt in certain areas.
When salting the roads, it is important to consider the temperature and the environmental impact. While salt can be a solution for melting ice and improving safety in milder winter conditions, in extremely cold environments or ones sensitive to ecological impact, alternative methods or materials might need to be considered.
It is illegal for minor to __________
What does Earth's hydrosphere include? the water on Earth the hard outer part of Earth the layer of gases surrounding Earth the living things on Earth
Answer: The water on earth.
Explanation:
The hydrosphere is the sphere of the earth which includes water bodies like ocean, river, lakes, ponds, estuaries, and groundwater. The water in the water bodies is replenished by the water cycle.
what are two main ways minerals are classified?
Hardness and density to figure out a mineral'a classification.
What would happen if the cell membrane were completely made of a polar substance?
A cell membrane has a lipid bilayer meaning that it is selectively permeable - allowing only certain ions to enter the cell. Thus maintaining the unique cellular composition which is different from the extracellular environment.
A cell membrane completely made of a polar substance would be completely permeable to all ions present in the extracellular environment, thus disrupting unique ionic composition within the cell.
Answer:done
The cell would be unable to maintain a stable internal environment.
Explanation:
list four physical properties of toothpaste
An AM radio station broadcasts news at 650 kHz. What is the frequency of this radio wave in hertz?
650 KHz means 650 thousand hertz = 650,000 Hertz. If it were an FM station, say at 92.3 MHz, that would be 92.3 Million Hertz or 92,300,000 Hertz. MHz means mega hertz. Mega = Million.
The equivalency of the frequency of the radio wave in Hz is [tex]650 \times 10^3 \ Hz[/tex].
The frequency of a wave is number of cycles of the wave at a given period of time. The frequency of the wave is directly proportional to the speed of the wave and inversely proportional to the wavelength.
[tex]v = f \lambda[/tex]
where;
v is the speed of the wave
f is the frequency of the wave
λ is the wavelength
The given frequency of the wave = 650 kHz
The equivalency of the frequency of the radio wave in Hz is calculated as follows;
[tex]f = 650 \times 10^3 \ Hz[/tex]
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Why is reproducibility so important to scientists? Reproducible experiments help scientists win awards. Reproducible experiments help scientists test if the results are correct. Reproducible experiments help build confidence in the theory. Reproducible experiments help scientists because reproducing experiments is easier than designing new experiments.
These are the answers B. Reproducible experiments help scientists test if the results are correct. C. Reproducible experiments help build confidence in the theory.
Reproducibility in scientific research is crucial for validating results, building confidence in theories, and maintaining transparency and credibility in the scientific community. It allows other scientists to confirm or question the reliability of findings and ensures that advancements in the field are based on sound evidence.
Explanation:Reproducibility is a fundamental aspect of scientific inquiry because it helps to ascertain the validity of research findings. One significant reason that reproducibility is vital to scientists is that it permits the verification of results. By repeating experiments and consistently achieving the same outcomes, it builds confidence in the theories and results presented. When experiments are replicable, it means that the findings are robust against variability and not just due to chance or specific conditions of a single study. Moreover, scientific communication and the peer review process rely on clear descriptions of methodologies, so other researchers can replicate studies to confirm reliability or expand upon the findings with additional measures.
Replicability ensures the transparency and openness of scientific work, allowing for meaningful critique and genuine advances in the field. If research is not reproducible, the legitimacy of the original findings is reasonably cast into doubt, leading scientists to question and possibly abandon the theoretical claims. This rigorous process underpins the credibility of scientific knowledge and ensures that the scientific community and the public can have confidence in scientific claims. The entire scientific method relies heavily on the ability to replicate experiments to support evidence-based conclusions -- without replication, the reliability of scientific advancements would be greatly undermined.
You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?
(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.
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
List the experiment procedures. Some steps have been filled in for you. You may need to adjust the numbers to match the steps you decide on.
1. Identify the variables.
2. Write out your hypothesis in an if/then format.
3.Gather your materials.
4.
5.
6.
7.
8.
9. Analyze the data.
10. Write your conclusion.
The steps to conduct a scientific experiment include identifying variables, formulating a hypothesis, gathering materials, designing the experiment, executing the experiment, recording and organizing data, analyzing the data, writing a conclusion, and sharing the findings.
Explanation:The subject question seeks to understand the procedural steps in conducting an experiment. Below is a brief rundown of the steps:
Identify the variables. Write out your hypothesis in an if/then format. Gather your materials. Design the experiment: This is where you decide how to manipulate and measure the variables you identified. Execute the experiment: Here you follow your experimental design and record results. Record and organize data: After executing the experiment, ensure that you carefully record and neatly organize your data. Analyze the data: Use appropriate statistical tools to interpret the data you have. Write a conclusion: The conclusion should summarize the results of the experiment, supporting or disproving the hypothesis. Communicate your results: It's crucial to share your findings with others in a report or presentation format.Learn more about Experiment Procedures
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To conduct an Experiment procedures, you should identify the variables, write a hypothesis, gather materials, design the experiment, conduct the experiment, collect and record data, analyze the data, draw conclusions, and write a conclusion.
Identify the Experiment procedures.
Write out your hypothesis in an if/then format.
Gather your materials.
Design the experiment, including the independent and dependent variables, and any control groups.
Conduct the experiment, following the procedure and manipulating the independent variable.
Record and collect data during the experiment.
Analyze the data using statistical, mathematical, or graphical methods.
Draw conclusions from the data analysis, determining if the results support or reject the hypothesis.
Write a conclusion summarizing the findings of the experiment.
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Which state of matter does lightning represent?
Solid
Liquid
Gas
Plasma
Plasma
Explanation:Plasma is the stuff of lightning, flame and stars. Plasma is neither solid, liquid nor gas plasma is a fourth state of matter.
Plasma is when the electrons are "freed" from their host atoms for a short time, due to high temperatures. Fire is plasma, it responds to electric fields. Lightning is also plasma.
solubility is usually expressed as the maximum number of grams of
We usually expess solubility as the maximum number of grams of of a solute that will dissolve in 100 g of solvent.
For example, at 20 °C, the solubility of sodium chloride is 35.89 g/100 g water.
How does substituting a hydrogen atom with a halogen in a hydrocarbon affect the resulting compound?
A.
All the single bonds in the original molecule change to double bonds.
B.
The boiling point of the new compound increases.
C.
The bonds between the carbon atoms in the molecule become weaker.
D.
The resulting compound is called a saturated hydrocarbon.
E.
The substitution allows each carbon atom to accept more than four valence electrons.
da multiple choice imo is B.
and also i believe ur correct on the picture but i'm not 100% sure.
Question One
Let's start with what is not true. E is utter nonsense. Hydrogen for a halogen is a 1 to 1 trade. You give up Michael Jordan, you get Shaq. One for one.
A is not true. The halogen came from a single bond. The hydrogen merely takes it's place.
C is not right either. The bonds between the Carbon atoms don't change. What does is the polar charge that the halogen created. The halogen takes on an electron which makes the molecule minus on the halogen end and positive on the carbon chain.
B is not right. Because the polar charge has been removed, the boiling point will decrease. You have to read this rather carefully. Down and up are bad news in science and you will become better in the sciences when you know what down and up mean.
So we are left with D. D is the correct answer. You now have a very pure saturated compound (but it was before).
Question Two
Start with Sulfur's uncharge state. It has 16 electrons. Those 16 fill up in the following way
1s^2 2s^2 2p^6 3s^2
So far what we have used up 2 + 2 + 6 + 2 = 12
We need to fill up 4 more to put somewhere. That somewhere is in the 3p^6 orbital only we have only 4 more to go. There is a space for 2 more elections in th 3p level.
P level electrons can contain only 6 elections. So whatever follows will complete the 3p level. That's why sulfur's most common charge is - 2
When 2 more electrons are taken on two things are true.
1. The charge is - 2
2. The orbital that fills up is 3p and it becomes 3p^6
If a temperature increase from 10.0 ∘C to 22.0 ∘C doubles the rate constant for a reaction, what is the value of the activation barrier for the reaction?\
The activation barrier for the reaction can be determined by comparing the rate constants at two different temperatures using the Arrhenius equation. In this case, the activation barrier is approximately 45.1 kJ/mol.
Explanation:The activation barrier for a reaction can be determined by comparing the rate constants at two different temperatures. In this case, if the rate constant doubles when the temperature increases from 10.0 °C to 22.0 °C, it means that the reaction rate doubles. The relationship between reaction rate and temperature is given by the Arrhenius equation: k = Ae-Ea/RT, where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the ideal gas constant, and T is the temperature in Kelvin.
When the temperature increases from T1 to T2, we can use the ratio of the rate constants to find the difference in activation energy:
Ea = -R(ln(k2/k1))/(1/T2 - 1/T1)
In this case, if we assume that the pre-exponential factor remains constant, we can substitute the given information into the equation to find the activation energy:
Ea = -8.314 J/mol K (ln(2))/(1/(22+273) - 1/(10+273))
Ea ≈ 45.1 kJ/mol
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".
A scientist analyzes four samples of compounds. He finds the first compound contains 10 grams of sodium, 211 grams of potassium, 7 grams of lead, and 215 grams of zinc. The second sample contains 169 grams of zinc, 108 grams of lead, 88 grams of potassium, and 30 grams of sodium. The third sample contains 55 grams of lead, 254 grams of potassium, 56 grams of sodium, and 129 grams of zinc. The last sample contains 89 grams of sodium, 38 grams of lead, 64 grams of zinc, and 150 grams of potassium. Use these data to make a table.
Answer:
yea yea
Explanation:
helpppppp meeeee pleaasssss
The temperature scale that starts with absolute zero is the ___ scale
it's the kelvin sale
Is N2 + H2 →NH4 a balanced chemical equation? Is it obeying the law of conservation of matter?
No the equation is not balanced. The Nitrogen (N) is not balanced, but the Hydrogen (H) is balanced.
No, the equation is not balanced. Neither the Nitrogen (N) or Hydrogen (H) are balanced.
Yes, the equation is balanced. Both the Nitrogen (N) and Hydrogen (H) are balanced.
No the equation is not balanced. The Hydrogen (H) is not balanced, but the Nitrogen (N) is balanced.
The chemical equation N2 + H2 → NH4 is unbalanced. Neither Nitrogen (N) nor Hydrogen (H) atoms are balanced in accordance with the law of conservation of matter that asserts equality of atoms in reactants and products.
Explanation:The chemical equation given, N2 + H2 → NH4, is not balanced and thus it's not adhering to the law of conservation of matter. This law states that matter cannot be created or destroyed and therefore, the number of atoms present in the reactants should equal the number of atoms in the products. In this equation, there are 2 Nitrogen atoms and 2 Hydrogen atoms on the left side, but on the right side, there's 1 Nitrogen atom and 4 Hydrogen atoms in the NH4 molecule. Therefore, neither the Nitrogen (N) nor the Hydrogen (H) are balanced in this equation.
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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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Which is a characteristic of an amorphous solid?
1. made up of crystals
2. particles arranged in a repeating pattern
3. has a distinct melting point
4. becomes softer as temperature rises
4. becomes softer as temperature rises
Explanation:An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.
An amorphous solid becomes softer as temperature rises, which is distinct from crystalline solids; they do not have a sharp melting point but gradually soften with increasing temperature. Option 4 is correct.
An amorphous solid is a type of solid that lacks a well-defined, long-range order or repeating pattern in its internal structure. Unlike crystalline solids, which have sharp melting points due to identical forces holding each atom or molecule in a precise arrangement, amorphous solids do not have a distinct melting point. Instead, they soften over a range of temperatures as heat is applied.
When an amorphous material such as glass or plastic is heated, the weakest intermolecular attractions break first, leading to a gradual softening of the material. As the temperature increases, stronger attractions also begin to break. This results in amorphous solids becoming softer with the rise in temperature, which is a characteristic distinct from crystalline solids.
Therefore, the correct answer to the question is that an amorphous solid becomes softer as temperature rises.
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 mass conserved in a chemical reaction?
yes i think so i think
No, mass is not conserved in a chemical reaction.
What does emulsion mean?
Answer:
Emulsion is a mixture of liquid that do not dissolve each other or mix very well.
Select the words that correctly fill in the blanks for this statement:
The p sublevel has ________ orbitals that are ________-shaped.
three, dumbbell
three, spherical
five, dumbbell
five, spherical
The correct answer is option A. Three, dumbbell.
The p sublevel has __three_orbitals that are _dunmbbell_-shaped.
The three orbitals of the p sublevel are oriented in three directions along the x, y and Z axis. The orbitals are called px, py and pz. Each p orbital can have a maximum of 2 electrons. Since there are three p orbitals, the p sublevel can have a maximum of 6 electrons.
Answer : The correct option is, three, dumbbell.
Explanation :
As we know that there are many sub-levels which are s, p, d, f, g and so on. The sub-level are oriented in three directions along the x, y and z axis.
The 's' sub-level has one orbital that are spherically shaped.
The 'p' sub-level has three orbitals [tex](p_x,p_y,p_z)[/tex] that are dumbbell shaped.
The 'd' sub-level has five orbitals [tex](d_{xy},d_{xz},d_{yz}d_{z^2},d_{x^2-y^2})[/tex] that are double-dumbbell shaped.
The 'f' sub-level has seven orbitals [tex](f_{x(x^2-3y^2)},f_{y(x^2-3z^2)},f_{y(3x^2-3y^2)},f_{xz^2},f_{z^3},f_{yz^2},f_{xyz})[/tex] that are complex flower shaped.
Hence, the 'p' sub-level has three orbitals that are dumbbell shaped.