Answer:
c)heat and pressure is the correct answer.
Explanation:
Rock change into a metamorphic rock by heat and pressure.
Metamorphic rocks are formed due to physical and chemical change by heat and pressure of existing rocks. The magma heat warms the enclosing rocks making them change.
The rocks buried underground in the Earth, when they are subjected to heat and pressure these rocks change into metamorphic rocks.The pressure crushes the rock to produce metamorphic rock.
Which material is very strong and tough but shows very little elongation as it absorbs energy? spider silk rubber Kevlar® concrete
Why is water the universal solvent? solubility, solute, solvent, dissolve?
Answer:
Water
Explanation:
If an element has an atomic number of 11 and a mass number of 23, how many protons, neutrons, and electrons does it have
●1. What is the density of 2.0 g of a substance that has a volume of 5.0 mL?
The density of 2.0 g of a substance that has a volume of 5.0 mL is 0.4 g/ml.
What is density ?The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however the Latin letter D may also be used. Density is calculated mathematically by dividing mass by volume.
How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au). Styrofoam blocks are less dense than bricks. Mass per unit volume serves as its definition.
Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion.
Density = Mass / Volume
Density = 2.0g / 5.0ml
Density = 0.4 g/ml
Thus, The density of 2.0 g of a substance that has a volume of 5.0 mL is 0.4 g/ml.
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What is the mass of a light bulb
The mass of a light bulb varies depending on the type and size of the bulb and is not given by its power rating. The power ratings, such as 60 W or 100 W, pertain to energy consumption, not to mass. To find the mass, you would need to physically weigh the bulb.
Explanation:Mass of a Light Bulb
The question does not explicitly specify the mass of a light bulb. However, as a physics concept, when discussing light bulbs, we often refer to their energy consumption and power ratings rather than their physical mass. A light bulb's power rating, such as 60 watts (W) or 100 watts (W), indicates how much electrical energy it uses per unit of time. The mass of a light bulb can vary based on the type and size of the bulb.
When we're examining a bulb's energy usage, we might ask how much energy a 100 W light bulb uses or compare the resistance and current in light bulbs of different wattages. The resistance of a filament in a bulb determines the amount of energy converted into heat and light. A higher-wattage bulb will usually be hotter and brighter as it converts more electrical energy compared to a lower-wattage bulb.
For the mass of a specific light bulb, you would typically need to weigh it using a scale, as the mass is not directly related to its power consumption or electrical characteristics.
What is the relationship between an atom's atomic mass and one mole of that atom?
Final answer:
The atomic mass of an element in atomic mass units (amu) is numerically the same as the molar mass in grams per mole (g/mol). One mole of any substance contains Avogadro's number of entities and has a mass in grams equal to its atomic or formula mass. This correlation is a fundamental concept in chemistry that allows for conversions among mass, moles, and number of atoms or molecules.
Explanation:
The relationship between an atom's atomic mass and one mole of that atom is represented by the concept of molar mass. Specifically, the atomic mass of an element, expressed in atomic mass units (amu), is numerically equivalent to the molar mass of that element in grams per mole (g/mol). This means that if you have a sample with a mass in grams equal to the atomic mass listed on the periodic table, you have one mole of that element.
For example, the atomic mass of carbon (C) is 12 amu, and therefore, the molar mass of carbon is 12 g/mol. If we have 12 grams of carbon, we have one mole of carbon atoms, which also contains Avogadro's number of atoms, roughly 6.022 × 1023 atoms. This relation provides an essential link between microscopic particles, such as atoms, and macroscopic quantities that we can measure in the laboratory.
Understanding the molar mass allows chemists to convert between mass, moles, and number of atoms or molecules, which is crucial for performing calculations related to chemical reactions and the stoichiometry of compounds.
Of protons neutrons and electrons, which of these can never change in atom during an ordinary chemical or physical change
The number of electron or proton of an atom can change depending on the chemical bond and the other chemical it is bonded with; an atom can either gain or lose electron. However, the number of neutrons of an atom can never change, this is the primary identity or signature of an atom.
Answer:
neutrons
In an ordinary chemical or physical change, the protons within an atom remain unchanged. They reside in the atom's nucleus and define the atom's identity. Chemical reactions mostly involve movement of electrons whilst protons remain constant.
Explanation:In the context of an ordinary chemical or physical change, the particle that remains unchanged within an atom is the proton. Protons, along with neutrons, reside within the nucleus of the atom, and are fundamental to an atom's identity. Each unique element is distinguished by its specific number of protons, known as the atomic number.
Chemical reactions, which are characterized by the rearrangement of atoms, primarily involve the movement of electrons, which constitute the outer part of an atom. Positive charges form when these electrons are lost. However, the number of protons remains constant throughout these changes.
An exception to this rule comes into play with certain nuclear reactions, such as radioactive decay, where the number of protons can change, leading to the formation of a different element. However, these are not considered 'ordinary' chemical or physical changes.
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What is a solution that contains a large amount of solute compared to solvent?
How many valence electrons are in a stable ion of a period 4 metal?
A stable ion of a period 4 metal typically has 2 valence electrons, but the specific number can vary depending on the element within the period.
How many valence electrons are in a stable ion of a period 4 metal?In a period 4 metal, the number of valence electrons can vary depending on the specific element. However, many period 4 metals, such as those in Group 2 (e.g., calcium, strontium) and Group 12 (e.g., zinc, cadmium), have 2 valence electrons because they are in the s-block of the periodic table. These metals typically form stable ions by losing these valence electrons to achieve a stable electron configuration.
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Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray?
8 x 10⁻² moles of luminol are present in the 2.00L of the diluted spray.
The number of moles =? The molarity = (4.0 x 10⁻² M) Volume = 2LMolarity refers to the molar concentration of solution and expressed as the number of moles of solute in one liter of solution. In other words, it is the concentration of a solution in regards to the number of moles of the solute in one liter of solution.
Further ExplanationTo determine the Molarity of a solution, the moles of solute will be divided by the liters of solution. This can be expressed as:
Molarity = moles of solute / liters of solution
if you cross multiply, then you have:
N = M x V
Therefore, In the given question, the mole of luminol can be calculated using the Equation below:
N = M x V , where
N represents the number of moles M represents molarity V represents the Volume (liters of solution)If you substitute the Values, then you have:
n = (4.0 x 10⁻² M) (2 L)
n = 8 x 10⁻² moles
Thus, 8 x 10⁻² moles of luminol are present in the 2.00L of the diluted spray.
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Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 M https://brainly.com/question/5685664The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O https://brainly.com/question/2814870KEYWORDS:
luminoldiluted solutionmolaritymolesdiluted spraysolute per literThe conjugate acid of a particular halide has a pka = 3. a student wants to use this halide in a substitution reaction thinking it will have a good leaving group. can this student use this halide in a substitution reaction?
Since the leaving ability of the halide ions increasees as the basicity of the halide decreases.
If the basicity of the halide decreases as the its conjugate acid is strong.
Since the pKa value of conjuage acid of haldie is 3, it is a weak acid. So, it halide is not a good leaving group.
Therefore the answer is No, because a good leaving group is the conjugate base of a strong acid. The halide not acidic enough to be a good leaving group.
Which of the following ions came from an atom that lost two electrons
Final answer:
An ion from an atom that lost two electrons is a cation with a 2+ charge, such as Ca²⁺ for calcium or Mg²⁺ for magnesium, typically occurring with group 2 elements.
Explanation:
An ion that came from an atom that lost two electrons is known as a cation. This is because when an atom loses electrons it becomes positively charged since it has more protons than electrons. The alkaline earth metals of group 2 in the periodic table are an example of atoms that lose two electrons to form cations with a 2+ charge. When a calcium atom loses two electrons, it forms a Ca²⁺ ion, which is a calcium ion with a 2+ charge. Similarly, a magnesium atom will lose two electrons to form a Mg²⁺ ion, also known as a magnesium ion. These ions have the same number of electrons as the nearest noble gas in the periodic table.
Ionic equation shows all soluble ionic substances dissociated into ions both teh atoms and the electrical must be balanced in this type of equation
Suppose that in an ionic compound, "m" represents a metal that could form more than one type of ion. in the formula mf2 , the charge of the m ion would be:
The charge of metal would be +2. Ionic compounds are neutral compounds. It is formed from positively charged ions (cations) and negatively charged ions (anions).
In MF2 is a neutral ionic compound. Therefore, net charge on MF2 is zero. F belongs to halogen family. It gains one electron to get noble gas configuration. So, fluorine has -1 charge.
Hence, charge on metal would be:
Charge of metal + 2*charge of fluorine =0
Charge of metal + 2*(-1) =0
Charge of metal - 2=0
Charge of metal= +2
Thus, we can conclude that, charge of metal in MF2 is +2. i.e., metal loses two electrons to attain noble gas configuration.
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The charge of the M ion in the compound MF2 is -1.
Explanation:The charge of the m ion in the ionic compound MF2 can be determined based on the charges of the other ions present in the compound. Since F is a Group 17 element and forms an ion with a charge of -1, the charge of the M ion can be calculated using the formula:
2(M) + 2(F) = 02(M) = -2(F)M = -1Therefore, the charge of the M ion in the compound MF2 is -1.
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Particles in a plasma experience collisions than particles in a solid. Based on their state of matter alone, is it easier to speak of the shape of the Sun or the Moon? Two unknown substances are in identical beakers. One is a solid and the other is a plasma. If you were given a scale to allow you to obtain the mass of the substance, and had to guess based on mass alone, you would say that the plasma is in the beaker.
Particles in a plasma experience more collisions than particles in a solid.
Based on their state of matter alone, is it easier to speak of the shape of the Sun or the Moon? moon
Two unknown substances are in identical beakers. One is a solid and the other is a plasma. If you were given a scale to allow you to obtain the mass of the substance, and had to guess based on mass alone, you would say that the plasma is in the lighter beaker.
Give the physiological significance of the ions zn2+ fe2+ cl- nh4+ and po43-
I can help you with some of the ions
Cl- : the purpose of this is to alter neuron responsiveness to stimulation; also main component of stomach acid which is important in digestion; shift in erythrocytes
PO43- : forms Ca3(PO4) with Calcium which is important in hardening of bone and teeth; an important component of phospholipids; also a component of nucleotides; the most common intracellular anion; intracellular buffer
Final answer:
Zinc, iron, chloride, ammonium, and phosphate ions respectively contribute to enzyme function, oxygen transport, osmotic balance, acid-base balance, and energy transfer within the human body among other roles, highlighting their physiological significance.
Explanation:
The physiological significance of the ions Zn²⁺, Fe²⁺, Cl-, NH4+ and PO4³⁻extends across various important functions in the human body. Here we delve into each ion's role to clarify their critical contributions.
Zinc (Zn²⁺) plays a fundamental role in enzyme function, DNA synthesis, and the immune response. Iron (Fe²⁺) is essential for oxygen transport in the blood, as part of hemoglobin, and is also involved in energy metabolism. Chloride (Cl⁻) helps maintain osmotic balance, is part of hydrochloric acid production in the stomach, and assists in electrical activity of neurons. Ammonium (NH⁴⁺) results from protein metabolism and its regulation is vital for maintaining the body's acid-base balance. Phosphate (PO4³⁻ )is crucial for energy transfer within cells, as part of ATP, and contributes to the structure of DNA and RNA.
What kind of change occurs when salt dissolves in water? chemical change solution change physical change substance change Description
Answer: physical change
Explanation:
A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.
Example: salt dissolves in water, as there is only a change in phase and no new substance is being formed.
A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Oxidation of magnesium leads to formation of white magnesium oxide and is a chemical change.
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
How to determine endothermic and exothermic reaction using delta h?
A homogeneous mixture has the same composition throughout.
a. True
b. False
How many atoms are in 131.97 liters of water vapor at STP?
Answer:Total atoms in 131.97 liters of water vapor at STP are[tex]1.0643\times 10^{25} atoms[/tex].
Explanation:
At STP, one mole of gas occupies 22.4 L of volume.
Then 131.97 L of the volume will be occupied by:
[tex]\frac{1}{22.4 L}\times 131.97 L=5.8915 moles[/tex]
Number of water vapor molecules :
[tex]Moles\times N_A=5.8915 mol\times 6.022\times 10^{23} mol^{-1}=3.5478\times 10^{24} molecules[/tex]
In 1 molecule of water vapor = 3 atoms
Total number of atoms in [tex]3.5478\times 10^{24} molecules[/tex]:
[tex]3\times 3.5478\times 10^{24} molecules=1.0643\times 10^{25} atoms[/tex]
Total atoms in 131.97 liters of water vapor at STP are[tex]1.0643\times 10^{25} atoms[/tex].
What is evidence?
A. a type of package
B. Date that support a hypothesis
C. A claim made by a product
D. An expert on a topic
Draw the lewis structure for butanal, which has the condensed formula ch3(ch2)2cho. show all hydrogen atoms and lone pairs of electrons.
There are 10 hydrogen atoms that bind and there are 2 pairs of free electrons in the non-binding O atom
Further explanationAldehydes are alkane-derived compounds containing carbonyl groups (-CO-) where one bond binds to an alkyl group while another binds to a hydrogen atom.
The general structure is R-CHO with the molecular formula :
[tex]\large{\boxed{\boxed{\bold{C_nH_{2n}O}}}[/tex]
Naming is generally the same as the alkane by replacing the suffix with -al
Butanal or butyraldehyde is an aldehyde which has 4 C atoms
Inside the structure there are 3 atoms involved in bonding:
1. Atom C with 4 valence electrons, requires 4 electrons to reach the octet 2. Atom O with 6 valence electrons, requires 2 electrons to reach the octet 3. Atom H with 1 valence electron, requires 1 electron to reach a dupletIn describing Lewis's structure the steps that can be taken are:
1. Count the number of valence electrons from atoms in a molecule 2. Give each bond a pair of electrons 3. The remaining electrons are given to the atomic terminal so that an octet is reached 4. The remaining electrons that still exist in the central atom 5. If the central atom is not yet octet, free electrons are drawn to the central atom to form double bondsIn the Butanal structure (C₄H₈O) there is 1 double bond of the functional group (-CHO) between the C atom and the O atom
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Keywords: butanal, aldehyde, Lewis structure, a valence electron
There are [tex]\boxed{10}[/tex] hydrogens and [tex]\boxed2[/tex] lone pairs in the Lewis structure of butanal. (Refer structure in the attached image)
Further Explanation:
The bonding between the different atoms in covalent molecules is shown by some diagrams known as the Lewis structures. These also show the presence of lone pairs in the molecule. These are also known as Lewis dot diagrams, electron dot diagrams, Lewis dot structures or Lewis dot formula. In covalent compounds, the geometry, polarity, and reactivity are predicted by these structures.
Lewis structure of [tex]{\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}{\left( {{\mathbf{C}}{{\mathbf{H}}_{\mathbf{2}}}} \right)_{\mathbf{2}}}{\mathbf{CHO}}[/tex] :
The total number of valence electrons of [tex]{\text{C}}{{\text{H}}_3}{\left({{\text{C}}{{\text{H}}_2}}\right)_2}{\text{CHO}}[/tex] is calculated as,
Total valence electrons = [(4) (Valence electrons of C) + (8) (Valence electrons of H) + (1) (Valence electrons of O)]
[tex]\begin{aligned}{\text{Total valence electrons}}\left({{\text{TVE}}}\right)&= \left[{\left({\text{4}}\right)\left({\text{4}}\right)+\left({\text{8}}\right)\left({\text{1}}\right)+\left({\text{1}} \right)\left({\text{6}}\right)}\right]\\&=30\\\end{gathered}[/tex]
The general formula of aldehyde functional group is [tex]{\text{R}} - {\text{CHO}}[/tex] . The given molecule has also the same formula and therefore the given molecule is an aldehyde.
In [tex]{\text{C}}{{\text{H}}_3}{\left({{\text{C}}{{\text{H}}_2}}\right)_2}{\text{CHO}}[/tex] , the total number of valence electrons is 30. Here, [tex]{{\text{C}}_1}[/tex] forms two single bonds, one with a hydrogen atom and other with [tex]{{\text{C}}_2}[/tex] . It also forms one double bond with an oxygen atom. [tex]{{\text{C}}_2}[/tex] forms two single bonds with other two hydrogen atoms and two single bonds with [tex]{{\text{C}}_1}[/tex] and [tex]{{\text{C}}_3}[/tex] separately. [tex]{{\text{C}}_3}[/tex] forms two single bonds with two hydrogen atoms and two single bonds with [tex]{{\text{C}}_2}[/tex] and [tex]{{\text{C}}_4}[/tex] separately. [tex]{{\text{C}}_4}[/tex] forms one single bond with [tex]{{\text{C}}_3}[/tex] and three single bonds with three hydrogen atoms. Oxygen forms one double bond with [tex]{{\text{C}}_1}[/tex] . Each hydrogen forms a single bond with carbon atoms and therefore 26 electrons are utilized. The remaining four are present in the form of lone pair on the oxygen atom. (Refer to the structure in the attached image)
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Molecular structure and chemical bonding
Keywords: Lewis structure, valence electrons, butanal, CH3(CH2)2CHO, single bonds, double bonds, carbon atom, hydrogen atom, oxygen atom, valence electrons.
Can an enzyme make a nonspontaneous reaction occur spontaneously? why or why not? see section 8.3 ( page 180) .
How many sulfur atoms are in 1.10 mol of aluminum sulfide?
There are 1.98 × 10^24 sulfur atoms in 1.10 mol of aluminum sulfide.
Explanation:The formula for aluminum sulfide is Al2S3. To determine the number of sulfur atoms in 1.10 mol of aluminum sulfide, we need to multiply Avogadro's number (6.022 × 1023 mol-1) by the number of moles of sulfur in the compound. In Al2S3, there are 3 sulfur atoms per molecule. Therefore, the number of sulfur atoms in 1.10 mol of aluminum sulfide is 3 × 1.10 × 6.022 × 1023 = 1.98 × 1024.
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Final answer:
In 1.10 mol of aluminum sulfide, there are 1.987 x 10^24 atoms of sulfur, based on the stoichiometry of Al₂S₃ and the use of Avogadro's number.
Explanation:
To determine the number of sulfur atoms in 1.10 mol of aluminum sulfide (Al₂S₃), it's essential to understand the compound's stoichiometry. Aluminum sulfide has a molecular formula of Al₂S₃, indicating that each mole of aluminum sulfide contains two moles of aluminum atoms and three moles of sulfur atoms.
Given 1.10 moles of Al₂S₃, the calculation to find the number of sulfur atoms involves multiplying the number of moles of aluminum sulfide by the ratio of sulfur atoms per mole of aluminum sulfide, then by Avogadro's number (6.022 × 1023 atoms/mol) to convert moles to atoms:
Total moles of sulfur = 1.10 moles Al₂S₃ × 3 moles S/mol Al₂S₃ = 3.30 moles STotal sulfur atoms = 3.30 moles S × 6.022 × 1023 atoms/mol = 1.987 × 1024 atoms of sulfur.Mgso4 how many of each atom exists in a molecule of epsom salts
Why do you need two ammonium ions and one sulfide ion for the formula for ammonium sulfide?
To form ammonium sulfide, two ammonium ions are needed to balance the 2- charge of one sulfide ion, resulting in the neutral formula (NH4)2S.
Explanation:The student's question pertains to why we need two ammonium ions and one sulfide ion to form the chemical formula for ammonium sulfide. The reason is the charge balance. The ammonium ion (NH4+) carries a 1+ charge, and the sulfide ion (S2-) carries a 2- charge. To neutralize the charges, two ammonium ions are required to balance out the double negative charge of a single sulfide ion. Hence, the formula for ammonium sulfide is (NH4)2S. This is a fundamental concept in ionic bonding where charge neutrality must be achieved.
The temperature of a 500 ml sample of gas increases from 150 k to 300 k. what is the final volume of the sample of gas, if the pressure in the container is kept constant?
Describe what happens in a condensation reactions
How you can use atoms mass number atomic number and charge to determine how many protons neutrons and electrons
Why should those investigating a crime scene minimize contamination and what are some ways that contamination is limited at a crime scene
Minimizing contamination at a crime scene is essential to preserve evidence integrity, mirroring the importance of cleanliness in laboratory settings. Strategies like restricting access, using PPE, documenting everything carefully, and proper evidence collection are critical in preventing contamination. These measures help maintain the crime scene's integrity, aiding in solving the crime effectively.
Explanation:Minimizing contamination at a crime scene is crucial to preserving the integrity of evidence, which is key to solving the crime effectively. Just as in a laboratory, where cleanliness and precise handling of materials are paramount to prevent cross-contamination and ensure accurate results, a crime scene requires stringent measures to avoid altering the scene or introducing foreign substances. This caution is pivotal because the evidence must reflect the event accurately without external influence, akin to preventing hazardous waste complications by avoiding spills rather than addressing them post-occurrence.
Several strategies help limit contamination at a crime scene, including:
Restricting access to the crime scene to essential personnel only to minimize the potential for contamination.Using personal protective equipment (PPE), such as gloves and shoe covers, to prevent investigators from leaving their own DNA or other trace evidence.Documenting everything meticulously before moving or touching anything. This can help ensure that the original condition of the scene is recorded and preserved.Employing proper evidence collection techniques, such as using clean tools and containers for each piece of evidence to prevent cross-contamination.Adhering to these practices helps maintain the crime scene's integrity, providing a clearer, uncontaminated narrative of events that enhances the chances of solving the crime and ensuring justice.