Answer:
Endothermic reaction
Explanation:
The law of conservation of energy tells us that energy cannot be destroyed nor created, it can however be changed from one form to another. When reactants take in energy, in what we call an endothermic reaction, the energy does not disappear, it is instead stored in the eventual products as potential energy. This is why the products will have more potential energy than the reactants.
There is a "short-cut" to determining the number of valence electrons. how can you determine the number of valence electrons by just looking at the periodic table?
1. Fill in the chart below (Table below) by writing formulas for the compounds that might form between the ions in the columns and rows. Some of these compounds don’t exist but you can still write formulas for them.
The chemical formula of glucose is C6H12O6, so it is classified as a(n)
Answer:
The answer is D. Pure Substance
Explanation:
How does the arrangement of particles in a gas differ from the arrangements in liquids and solids?
Give an example of how each compound is used or found in nature. Be sure to use complete sentences.
Water-
Hydrogen-
Ammonia-
Carbon Dioxide-
Hydrogen Sulfide-
Thank you!
1. What unit would you use if you were measuring the average kinetic energy of a substance?
A) joules
B )calories
C) Celsius
D) Watts
2. Convert 5.8 km to the unit mm.
A) 0.0000058 mm
B) 0.0058 mm
C) 5,800 mm
D) 5,800,000 mm
3. The density of a sample of metal is calculated using these three different sets of data: 2.9 g/mL, 2.8 g/mL, and 3.0 g/mL. If the true density of the metal is 2.1 g/mL, what can be said about these calculated density values?
A) The set is both accurate and precise.
B) The set is accurate but not precise.
C) The set is precise but not accurate.
D) The set is neither accurate nor precise.
4. Which statement best represents scientific laws?
A) Scientific laws are statements that contain scientists' opinions of how the world works.
B) Scientific laws are factual statements that explain why certain natural phenomena occur.
C) Scientific laws are theories that have been tested, proven, and adopted as laws.
D) Scientific laws are descriptions of observed phenomenon, generally accepted as facts.
5. A Scottish chemist Thomas Graham observed and experimented with gas particles in the 1800s. He formulated a mathematical equation that describes the relationship between the mass of a gas molecule and its rate of effusion. This relationship is a.....
A) law because it describes what happens without explaining why.
B) law because it is based on mathematics.
C) theory because it describes a relationship.
D) theory because it is a description without an explanation.
Joules is the correct unit for measuring average kinetic energy of a substance, 5.8 km is equal to 5,800,000 mm, the density values mention precision but lack accuracy, scientific laws are descriptions of observed phenomena, and Graham's equation is a law based on description of what occurs.
Explanation:The unit used for measuring the average kinetic energy of a substance is joules (A).
Converting 5.8 km to millimeters results in 5,800,000 mm (D).
The calculated density values of a metal sample (2.9 g/mL, 2.8 g/mL, and 3.0 g/mL) compared to the true density of 2.1 g/mL show that the set is precise but not accurate (C), as the measurements are close to each other but not to the true value.
A correct representation of scientific laws is that they are descriptions of observed phenomena, generally accepted as facts (D).
Thomas Graham's mathematical equation on the relationship between gas molecule mass and effusion rate is a law because it describes what happens without explaining why it happens (A).
The theory that the pressure of a gas increases as its volume decreases because molecules have to move a shorter distance to hit the container's walls falls under a microscopic description of chemical behavior, as it deals with the behavior of individual gas molecules.
What is the molarity of a 10.2 % by mass glucose (c6h12o6) solution? (the density of the solution is 1.03 g/ml .)?
Final answer:
To find the molarity of a 10.2% glucose solution with a density of 1.03 g/ml, you calculate the mass of glucose in 1 L of solution to be approximately 105.06 g, convert this to moles, and find the molarity to be 0.583 M.
Explanation:
The question asks: What is the molarity of a 10.2 % by mass glucose (C₆H₁₂O₆) solution? (the density of the solution is 1.03 g/ml). To find the molarity, first identify the mass of glucose in a given volume of the solution. Assuming we have 1000 mL (or 1 L) of solution for simplicity, with a density of 1.03 g/mL, the total mass of the solution would be 1030 g. Given that 10.2% is by mass, the mass of glucose is 10.2% of 1030 g, which equals 105.06 g.
To find the molarity, we need to convert the mass of glucose to moles by dividing by its molar mass (180.156 g/mol for C₆H₁₂O₆). This equals approximately 0.583 moles of glucose. Since molarity is defined as moles of solute per liter of solution, and our assumed volume of the solution is 1 L, the molarity of the glucose solution is therefore 0.583 M.
The molarity of a 10.2% by mass glucose solution with a density of 1.03 g/mL is approximately 0.583 M.
The solution's volume and the number of moles of glucose were calculated to determine this value.
This gives the concentration of glucose in the solution.To find the molarity of a 10.2% by mass glucose (C₆H₁₂O₆) solution with a density of 1.03 g/mL, follow these steps:
Determine the mass of glucose and the mass of the solution: Assume we have 100 g of solution. This means we have 10.2 g of glucose and 89.8 g of solvent (water).Calculate the number of moles of glucose: The molar mass of glucose (C₆H₁₂O₆) is 180.16 g/mol.Therefore, the molarity of the solution is approximately 0.583 M .
Correct question is: What is the molarity of a 10.2 % by mass glucose (C₆H₁₂O₆) solution? (the density of the solution is 1.03 g/ml .)?
A water molecule is added to an atp molecule to break atp down into adp and a phosphate group. write the chemical equation for this reaction.
The hydrolysis of ATP involves breaking it down into ADP, an inorganic phosphate, and energy using a water molecule. The chemical equation is ATP + H₂O → ADP + Pi + energy. This reaction releases energy necessary for cellular functions.
The reaction described is a hydrolysis reaction, where a water molecule is used to break down ATP. The chemical equation for this reaction is:
ATP + H₂O → ADP + Pi + energy
In this reaction:
ATP (adenosine triphosphate)H₂O (water)ADP (adenosine diphosphate)Pi (inorganic phosphate)Hydrolysis releases the energy stored in the high-energy bonds between ATP's phosphate groups. ATP is like a rechargeable battery, where the breakdown into ADP and Pi releases energy needed for cellular processes, and can be regenerated back into ATP.
Of the pigments that were soluble in the solvent, which pigment is the most polar? yellow, red, purple, blue
Describe how molecular models might prove to be helpful to scientists.
What is the mass percent composition of oxygen in ethylene glycol, c2h6o2?
Which of the following has zero acceleration?
A. A satellite orbiting at a constant speed.
B. A car making a turn at a constant speed.
C. A person running 100 m straight across a field at a constant speed.
D. A person running once around a track at a constant speed.
Answer:
C. A person running 100 m straight across a field at a constant speed.
Explanation:
Acceleration is defined as the change in the velocity per unit time. Velocity have both direction and magnitude (speed) . So, acceleration involves both change in direction and speed.
A). The satellite is in a curved orbit, so direction of satellite is constantly changing. Hence, not the answer.
B). The car is following a curve, so its direction is changing. Hence, not the answer.
C). The person is running straight at constant speed which means no change of speed or direction. Hence, it is the answer.
D). The person is on curved track, so his/her direction is changing. Hence, not the answer.
Calculate the molecular weight when a gas at 25.0 ∘c and 752 mmhg has a density of 1.053 g/l .
Consider the reaction mg(s)+fe2+(aq)→mg2+(aq)+fe(s) at 79 ∘c , where [fe2+]= 3.50 m and [mg2+]= 0.310 m . part a what is the value for the reaction quotient, q, for the cell? express your answer numerically.
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
Let's consider the following balanced equation.
Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s)
The reaction quotient (Q) is the ratio of the molar concentrations of the product species over those of the reactant species involved in the chemical reaction, taking stoichiometric coefficients of the reaction into account as exponents of the concentrations. It only includes gases and aqueous species.
Given [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient for this cell is:
[tex]Q = \frac{[Mg^{2+} ]}{[Fe^{2+} ]} = \frac{0.310}{3.50} = 0.0886[/tex]
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
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Compound 1: 76.0% ru and 24.0% o (by mass), compound 2: 61.2% ru and 38.8% o (by mass). part a what is the empirical formula for compound 1?
Sand dollars typically live in the intertidal zone. Which adaptation do sand dollars most likely have?
Answer:
burrowing in sandy or muddy substrates.
Explanation:
sand dollar also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits.Sand dollars can also be called "sand cakes" or "cake urchins".
Sand dollars live beyond the low water line on top of or beneath the surface of sandy or muddy areas. Sand dollars are frequently found together on the ocean bottom.
Which best describes the mass realationships between protons, neutrons, and electrons?
A) electrons and neutrons are equal is mass but protons are much larger
B) protons and neutrons are relatively the same mass, whereas electrons are much lower in mass
C) protons and neutrons are basically of equal mass
Protons and neutrons are relatively the same mass, whereas electrons are much lower in mass.
What is the relationship between the mass of electron, proton, and neutron?
Protons and neutrons have an equal mass which is equal to 1.67262 × 10⁻²⁷ kg.
Whereas electrons have almost negligible mass. The mass of an electron is 1/1,836 of a proton.
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Compounds with very high vapor pressures must have very minimal intermolecular forces true or false
Explain why the quantum number set (3, 3, -2, +½) is not possible for an electron in a ground-state atom.
Which of the following is a product formed when K reacts with Cl2?
KCl
K2Cl
KCl2
K2
Answer: KCl
Explanation: Potassium [K] has an atomic no of 19 and the electronic configuration is:
[tex]K :1s^22s^22p^63s^23p^64s^1[/tex] tends to get stable by losing one electron and forming [tex]K^+[/tex]
Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :
[tex]Cl :1s^22s^22p^63s^23p^5[/tex] tends to get stable by gaining one electron and forming [tex]Cl^-[/tex]
[tex]K^+[/tex] and [tex]Cl^-[/tex] attract each other and form an ionic bond. As we have a chlorine molecule that is two atoms of chlorine are present, 2 atoms of potassium will react to form 2 moles of KCl.
[tex]2K+Cl_2\rightarrow 2KCl[/tex]
How does the number of hydrogen atoms compared to the number of oxygen atoms in each amino acid?
The number of hydrogen atoms which are compared to the number of oxygen atoms in each amino acid because:
One amino acid contains 2 oxygen atoms and 4 hydrogren atomsA hydrogen atom is an atom of hydrogen which contains one positively charged proton and a negatively charged electron and is held together by a nucleus.
As a result of this, when comparing the number of hydrogen atoms and the number of oxygen atoms, it is important to note that they have different number in the R group and each R group may be different in the number of atoms.
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Why did the flame of the burning match or splint go out sodium carbonate and hcl?
Final answer:
The flame from the match or splint is extinguished when sodium carbonate reacts with HCl because carbon dioxide gas is produced. CO2 is heavier than air and does not support combustion, therefore it surrounds the flame, displacing the oxygen and putting the flame out.
Explanation:
The flame of the burning match or splint goes out when sodium carbonate (Na2CO3) reacts with hydrochloric acid (HCl) due to the production of carbon dioxide (CO2). This chemical reaction is a typical acid-base reaction where sodium carbonate acts as a base and hydrochloric acid acts as the acid. When these substances are combined, the sodium carbonate is neutralized, and one of the products formed is carbon dioxide gas. Carbon dioxide is a well-known fire extinguisher; it does not support combustion like oxygen does. Therefore, when carbon dioxide is released during the reaction, it displaces the oxygen around the flame, causing the flame to be extinguished.
A similar observation can be made in an experiment setup using lime water and carbon dioxide. Lime water turns milky in the presence of carbon dioxide, which is a simple test to indicate the production of CO2 gas. Additionally, in a combustion analysis, CO2 is produced when a compound containing carbon undergoes combustion. In this scenario, however, the carbon dioxide is resulting from a neutralization reaction rather than combustion but still plays a similar role in snuffing out the flame.
10 points: What do Lewis structures show?
A.) only electrons that are unavailable for bonding
B.) all but the valence electrons
C.) only valence electrons
D.) all electrons
Lewis structures show only valence electrons. They use dots and lines to represent valence electrons and bonds, respectively. By drawing Lewis structures, we can understand how atoms form bonds and predict the behavior of molecules.
Explanation:Lewis structures show only valence electrons. Valence electrons are the outermost electrons in an atom, and they are the ones involved in bonding. Lewis structures use dots and lines to represent valence electrons and bonds, respectively.
The dots around the atomic symbol represent the valence electrons of the element. For example, carbon has 4 valence electrons, so its Lewis structure would have 4 dots around it. Lines are used to represent bonds, where each line represents a pair of shared electrons.
By drawing Lewis structures, we can understand how atoms form bonds with each other and how electrons are shared between atoms in a molecule. This helps us determine the shape and properties of molecules and predict their behavior.
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what occurs in a chemical reaction
a. reactants break bonds and form new bonds to make new substances.
b. reactants break bonds and reform the same bonds.
c. reactants break bonds but do not form new substances
d. no chemical bonds are broken
Answer:
a. reactants break bonds and form new bonds to make new substances.
I took test K12 :)
In a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
The chemical reaction is the way in which one substance reacts against another, that is, they are thermodynamic processes of transformation of matter.
These reactions involve two or more substances (reactants), which change significantly in the process, and can consume or release energy to generate two or more substances called products.
They involve the formation or destruction of chemical bonds between the molecules of the reactants, generating a loss or gain of energy.In a chemical reaction, matter is deeply transformed.They generate certain products depending on the nature of the reagents, but also on the conditions in which the reaction occurs.Therefore, we can conclude that in a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
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A balanced chemical equation shows the proportions of reactants and products necessary for
How many moles of chlorine are in 6.67X10^40 chlorine molecules
Please put in scientific notation
To solve for the number of moles, we simply have to use the Avogadros number which states that there are 6.022 x 10^23 molecules per mole. Therefore:
number of moles = 6.67 X 10^40 chlorine molecules / (6.022 x 10^23 molecules / mole)
number of moles = 1.108 x 10^17 moles
Answer: 1.108 x 10^17
Explanation:
Which component is missing from the process of cellular respiration? Glucose + Oxygen → Carbon Dioxide + ________ + Energy
The answer is: Water.
Chemical reaction of cellular respiration (convert biochemical energy):
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O.
glucose + oxygen → carbon dioxide + water + energy .
This reaction is exothermic (energy is released).
Carbon dioxide and water are released during cellular respiration.
In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.
Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.
The half-life of an isotope is the time required for half the nuclei in a sample of the isotope to
Which equivalence factor set should you use to convert 126 g c to atoms c? (1 mol c/126 g c)(6.02 x 1023 atoms c/1 mol
c.(1 mol c/12.01 g c)(6.02 x 1023 atoms c/1 mol
c.(12.01 g c/1 mol c)(1 mol c/6.02 x 1023 atoms
c.(12.01 g c/1 mol c)(6.02 x 1023 atoms c/1 mol c)?
Answer: The equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]
Explanation:
Molar mass of a substance is defined as the mass of one mole of a substance.
We know that:
Molar mass of carbon atom = 12.01 g/mol
Given mass of carbon atom = 126 grams
Applying unitary method:
12.01 grams of carbon occupies 1 mole
So, 126 grams of carbon will occupy = [tex]\frac{1mol}{12.01g}\times 126g[/tex]
According to mole concept:
1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, [tex]\frac{1mol}{12.01g}\times 126g[/tex] of carbon will contain = [tex]\frac{1mol}{12.01g}\times 126g\times \frac{6.022\times 10^{23}}{1mol}=\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex] number of atoms
Hence, the equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]
A 100.0 g sample of water at 27.0°c is poured into a 70.3 g sample of water at 89.0°c. what will be the final temperature of the water?
Answer:
The final temperature of water = 52.6 C
Explanation:
The heat (q) lost or gained by a substance of mass m corresponding to a temperature change from T1 to T2 degrees is given as:
[tex]q = m*c*(T2-T1)[/tex]-----(1)
where c = specific heat of the substance
For water, c = 4.18 J/gC
In the given situation:
Heat lost by 70.3 g of water = Heat gained by 100.0 g of water
Based on equation (1) and considering that heat lost is negative:
[tex]-70.3*c*(T2-89.0)=100.0*c*(T2-27.0)[/tex]
Solving the above equation gives:
T2 = 52.6 C