Which statement applies to the horizontal rows or periods in the periodic table? A. The properties are all the same. B. The elements have the same number of electrons. C. The properties change going across each row. D. The elements in each row combine easily.
which 0f the following describes the electron sharing between hydrogine and flourine
Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips?
A) at both Poles
B) at the South Pole
C) at the North Pole
D) in the center of the bar magnet
Answer: Option (A) is the correct answer.
Explanation:
A bar which is magnetic in nature actually has magnetic poles at its end. One end is south pole and the other one is north pole.
And it is known that opposite poles attract each other. Therefore, when north pole comes near south pole then due to force of attraction these poles are attracted towards each other.
Thus, we can conclude that at both poles they should expect the magnetic force of the bar magnet to be the strongest and pick up the most paper clips.
A cube of ice melts in a beaker to form 10 g of water. What is the best estimate of the mass of the ice cube?
2 g
5 g
10 g
15 g
if one person can clean a house in 5 hours and the second person can clean the same house in 4 hours, how long would will it take to clean the house if they worked together?
Write the complete balanced equation for the decomposition of Fe(ClO3)3. You do not need to make your subscripts smaller; just write them out as regular numbers. For example: Fe(ClO3)3. (4 points)
The complete balanced equation for the decomposition of Fe(ClO₃)₃ (iron(III) chlorate) can be written as follows:
2 Fe(ClO₃)₃ → 2 FeCl₃ + 9 O₂
This equation represents the decomposition of iron(III) chlorate into iron(III) chloride (FeCl₃) and oxygen gas (O₂).
This equation indicates that when two moles of iron(III) chlorate decompose, it forms two moles of iron(III) chloride and releases nine moles of oxygen gas.
Iron(III) chlorate, is a compound composed of iron ions and chlorate ions. Upon decomposition, it breaks down into iron(III) chloride, FeCl₃, and oxygen gas, O₂.
The decomposition process occurs due to the heat energy provided, which breaks the chemical bonds within the chlorate ions, resulting in the formation of different products.
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a cheek cell is placed in a concentrated salt solution. what would likely happen to this cell?
Explanation:
A cell place in salty solution would loose water
as water will move from cell to surrounding hypertonic medium by the process of osmosis to shrivel up.
The stone that is mane when minerals harden in the mold of a living thing
The stone you're referring to is called "petrified wood."
Petrified wood forms when minerals, typically silica, replace the organic material in the wood over thousands or millions of years. This process, known as petrification, occurs when wood is buried underground in sedimentary layers where oxygen is limited, preventing decomposition. As groundwater rich in dissolved minerals seeps through the wood, it gradually replaces the organic components with minerals, preserving the original structure of the wood. The result is a fossilized form of wood that retains the texture, grain patterns, and sometimes even the cellular structure of the original tree. Petrified wood is prized for its beauty and is often used in jewelry, decorative items, and as a geological curiosity.
Completed version:
The stone that is mane when minerals harden in the mold of a living thing.
Methane reacts with oxygen to produce carbon dioxide and water. What are the products of this reaction? A. methane and water B. oxygen and carbon dioxide C. methane and oxygen D. carbon dioxide and water
The correct answer is D. carbon dioxide and water
Describe two ways in which atoms and molecules from solid?
an element that is liquid at room temperature but gas at 100 degrees
The unit m3 measures a. length b. area c. volume d. time
The unit m3 or cubic meters is used to measure volume in the International System of Units. Volume is the amount of space a three-dimensional object occupies.
Explanation:The unit m3 or cubic meters is used to measure volume, not length, area, or time. Volume refers to the amount of space that a three-dimensional object occupies, which is measured in cubic units. In the International System of Units (SI), the standard unit of volume is cubic meters.
For example, if you have a box that is 1 meter long, 1 meter wide, and 1 meter high, its volume would be 1 cubic meter (m3).
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The unit m³ represents volume, which can be visualized as a cube with an edge length of 1 meter. The concept of a cubic meter also influences other derived quantities like density. Understanding volume extensively helps with tasks involving unit conversions.
Explanation:The unit m³ (cubic meter) represents volume, not length, area, or time. It is measured as the product of three lengths. This is most easily visualized by imagining a cube with an edge length of exactly one meter. This cube, which has both length, width, and height of 1 meter, would occupy exactly one cubic meter of space. Figure 1.25 illustrates this concept by comparing different units of volume with relatable objects.
The concept of a cubic meter also relates to the physical quantity of density, which is the mass per volume and can be expressed in units like kilograms per cubic meter (kg/m3).
Derived quantities like volume can be expressed using SI base units such as this. Understanding the concept of volume, measured in cubic meters, helps with computational tasks, particularly those involving conversion between different units.
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You can prevent foodborne illness by
Foodborne illness can be prevented by practicing good hygiene, safe food handling, and proper cooking techniques. This involves washing hands, cleaning cooking surfaces, storing food at correct temperatures, avoiding cross-contamination, and ensuring food is cooked thoroughly.
Explanation:You can prevent foodborne illness by practicing good hygiene, safe food handling, and proper cooking techniques. Firstly, always wash your hands and clean your cooking surfaces before preparing food. Secondly, be sure to store food at proper temperatures. Perishable foods should be refrigerated and cooked foods should not be left out for too long. In addition, avoid cross-contaminating raw and cooked foods, so always use separate cutting boards and utensils. Lastly, make sure that your food is cooked thoroughly. Using a food thermometer to check meat and poultry can ensure that they are cooked to a safe temperature.
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true or false
making modles involved creating representation of complex objects or processes to help people study and understacannot be observed directlynd things that
true or false
Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?
Particles move independently of one another and are widely spaced.
I need help with everything
Explain how independent assortment occurs in cells and explain its importance.
Independent Assortment is the second law of inheritanceTraits are passed from parents to offspring independently of one another.Independent assortment is random and occurs during Metaphase I of meiosis.There are two possible alignments for the chromosomes.Since the alignments are random and not assigned, genetic variation occurs.
Consult an aufbau diagram which shell would be complete with 10 electrons
f is the answer. Have an amazing day
the atomic mass of chlorine is 35.45 u. is it possible for any single atom of chlorine to have a mass number of exactly 35.45? explain
Final answer:
The atomic mass of chlorine (35.45 amu) is an average value calculated from the mass numbers of the naturally occurring isotopes chlorine-35 and chlorine-37, and individual atoms of chlorine can only be one of these isotopes with whole number mass numbers.
Explanation:
The atomic mass of chlorine is 35.45 amu, but it is not possible for any single atom of chlorine to have a mass number of exactly 35.45. This value represents the average atomic mass, which is calculated by averaging the masses of chlorine's naturally occurring isotopes, mainly chlorine-35 and chlorine-37, in proportion to their abundance.
Individual chlorine atoms can either be the isotope chlorine-35 (with an atomic mass of approximately 35 amu) or chlorine-37 (with an atomic mass of approximately 37 amu). The atomic mass number of an isotope must be a whole number since it represents the total number of protons and neutrons in the nucleus, which are discrete entities.
The hardest mineral is called________, while the softest is called __________.
In a scientific experiment, the factor that may change in response to the manipulated variable is called the ______ variable.
What is the chemical formula of sulfur dioxide? A. SO B. SO2 C. SO3 D. S2O
Answer:
B: SO2
Explanation:
Which of the following has the least number of identified substances?
*compounds
*elements
*molecules
*subatomic particles
please help! thank you!
is mixing salt and pepper physical or chemical change ?
The mixing of salt and pepper is a physical change because they both combine and changes form but there is no change in composition.
What is physical change?The physical change is defined as change in physical properties but there is no change in chemical composition.
The physical change is reversible and this change does not form any new substance.
The chemical change is defined as change in chemical composition. In this change one substance can change in one or more substance.
The chemical change is irreversible as it forms new substance.
Thus, mixing of salt and pepper is a physical change because they both combine and changes form but there is no change in composition.
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what is the basis of an organic molecule?
Balance this chemical equation with an explanation please: CH3CH2OH + O2 = CO2 + H2O
Final answer:
To balance the equation CH3CH2OH + O2 = CO2 + H2O, one balances the carbon, hydrogen, and then the oxygen atoms in sequence, which yields the final balanced chemical equation of 2CH3CH2OH + 7O2 = 4CO2 + 6H2O.
Explanation:
To balance the chemical equation CH3CH2OH + O2 = CO2 + H2O, we need to ensure there are equal numbers of each type of atom on both sides of the equation. This process is known as stoichiometry.
Step 1: Balance the carbon atoms.
We have 2 carbon atoms in the ethanol (CH3CH2OH) molecule, so we need 2 CO2 molecules to balance the carbons: CH3CH2OH + O2 = 2CO2 + H2O.
Step 2: Balance the hydrogen atoms.
With 6 hydrogen atoms in ethanol, we need 3 H2O molecules to balance: CH3CH2OH + O2 = 2CO2 + 3H2O.
Step 3: Balance the oxygen atoms.
Now we have 4 oxygen atoms in the CO2 and 3 in the H2O, for a total of 7 oxygen atoms needed on the reactant side. We can get this by multiplying O2 by 7/2: CH3CH2OH + ½ 7O2 = 2CO2 + 3H2O.
Step 4: Balance the entire equation by getting rid of the fraction. Multiply all coefficients by 2 to get whole numbers: 2CH3CH2OH + 7O2 = 4CO2 + 6H2O.
The final balanced equation is 2CH3CH2OH + 7O2 = 4CO2 + 6H2O.
This is stoichiometry. The equation is balanced not only at the molecular level but also in terms of molar amounts of reactants and products.
If an object’s mechanical energy is equal to its potential energy how much kinetic energy does the object have how do you know
Final answer:
If an object's mechanical energy is equal to its potential energy, the kinetic energy of that object is 0 joules because the total mechanical energy is the sum of kinetic and potential energy which must remain constant in the absence of non-conservative forces.
Explanation:
If an object's mechanical energy is equal to its potential energy (PE), this means that the object has no kinetic energy (KE) at that moment. We deduce this from the principle that the mechanical energy of a system is conserved in the absence of non-conservative forces, such as friction or air resistance. Therefore, if mechanical energy equals potential energy, then the equation KE + PE = constant simplifies to 0 + PE = constant, which indicates that KE must be 0 joules because all the mechanical energy is stored as potential energy.
In scientific method, results are shared during _____.
1.data analysis
2.observation
3.communication
4.data collection
Which would be easier to seperate, a mixture or a compound
Mixtures are easier to separate than compounds because they can be separated by physical processes without changing the identity of the substances, whereas compounds require chemical reactions to be broken down into their elements.
To answer your question, mixtures are generally easier to separate than compounds. A mixture is a physical blend of two or more components that can be separated into their individual parts using physical methods, without changing the identity of the substances. For example, if you have a mixture of iron filings and sand, you can separate them with a magnet because each component retains its own properties. On the other hand, a compound is a substance that is chemically pure and is formed when two or more elements are combined through a chemical reaction to create a new substance with different properties from its elements.
Separating components of a mixture can be simple or complex depending on whether the mixture is heterogeneous or homogeneous. Heterogeneous mixtures have non-uniform composition and can often be separated by mechanical means. In comparison, homogeneous mixtures (solutions) have uniform composition and potential separation techniques include distillation or crystallization, based on physical properties like boiling point. For example, saltwater can be separated by distillation. Compounds usually require a chemical reaction to be broken down into their constituent elements, such as electrolysis for water.
Which of the following is a valid reason why a scientist might reject a scientific theory
A scientist might reject a scientific theory when contradictory observations are found, as scientific theories must be based on testable and falsifiable evidence that can withstand rigorous scrutiny.
Explanation:Valid Reasons for Rejecting Scientific Theories
A scientist might reject a scientific theory for several valid reasons. However, the reason that aligns with the scientific method and process is the discovery of contradictory observations. When experimental results or observations do not support the theory or directly conflict with it, scientists must reconsider and potentially discard the current theory. This is because a central tenet of the scientific method is that hypotheses and theories must be testable and falsifiable. If evidence accumulates that contradicts a theory, the responsible scientific action is to refine or replace the theory to better reflect the evidence.
Theories are not discarded due to public opinion, religious opposition, or legal and institutional votes, as these are external to the empirical basis of science. Rather, scientific theories are constantly subjected to scrutiny and must withstand rigorous testing and confirmation from multiple independent sources. This iterative process ensures that scientific knowledge evolves and becomes more robust over time.