Which of the following is the last step in performing a titration?
a.finding out which pH indicator works
b.determining the concentration of an unknown base
c.finding the number of moles of product produced in a reaction
d.determining the molecular masses of the products in the reaction
Claire created a model to study the day and night cycle of Earth as shown here. What causes different points on the globe to receive light at different times, explaining the day and night cycle of Earth?
the rotation of the lamp
the revolution of the lamp
the rotation of the globe
the revolution of the globe
Answer:
the rotation of the globe
Explanation:
As mentioned the model is representing the day and night cycle of earth thus the lamp must be the sun and the globe is earth.
The earth completes one year in taking one complete revolution around the sun (globe revolve around lamp).Thus due to revolution of earth the year gets completed.
The day and night of earth is due to rotation of earth on its own axis. The earth took 24 hours to complete one rotation on its axis.
Thus the rotation of globe causes it to receive light at different times.
What is the name of the compound with the formula niso3?
The compound with the formula NiSO₃ is called nickel(II) sulfite.
In chemical nomenclature, we use systematic naming rules to name chemical compounds based on their chemical formulas. The formula nickel(II) sulfite represents a compound that contains the elements nickel (Ni), sulfur (S), and oxygen (O).
To name this compound:
Identify the cation (positively charged ion) and the anion (negatively charged ion) in the formula. In this case, the cation is nickel (Ni²⁺) and the anion is the polyatomic ion sulfite (SO₃²⁻).
Use the name of cation followed by name of the anion. Since the nickel ion (Ni²⁺) has a fixed charge of +2, we use the Roman numeral "II" in parentheses after "nickel" to indicate its charge. The polyatomic ion sulfite (SO₃²⁻) consists of one sulfur atom and three oxygen atoms.
Putting it all together, we get the name "nickel(II) sulfite" for the compound with the formula NiSO₃.
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A gas at 300 k and 4.0 atm is moved to a new loacation with a temperature of 250 k. The volume changes from 5.5 L to 2.0 L. What is the pressure of the gas at the new location?
How many hydrogen atoms are there in 7.30 moles of ethanol
To find the number of hydrogen atoms in 7.30 moles of ethanol, multiply the number of moles of hydrogen per mole of ethanol (6) by the total moles of ethanol (7.30), resulting in 43.8 moles of hydrogen. Then, multiply by Avogadro's number to get approximately 2.64 × 1025 hydrogen atoms.
Explanation:To calculate the number of hydrogen atoms in 7.30 moles of ethanol, we first need to understand the chemical composition of ethanol. The chemical formula for ethanol is C2H6O, which indicates that each mole of ethanol contains 2 moles of carbon (C), 6 moles of hydrogen (H), and 1 mole of oxygen (O). Therefore, in one mole of ethanol, there are 6 moles of hydrogen atoms.
To find the total number of hydrogen atoms in 7.30 moles of ethanol, we multiply the number of moles of hydrogen per mole of ethanol (6) by the number of moles of ethanol (7.30):
Number of hydrogen atoms = 6 moles H/mole C2H6O × 7.30 moles C2H6O
Number of hydrogen atoms = 43.8 moles of hydrogen atoms.
Since one mole contains Avogadro's number of atoms, which is approximately 6.022 × 1023 atoms per mole, we calculate the total number of hydrogen atoms as follows:
Number of hydrogen atoms = 43.8 moles H × 6.022 × 1023 atoms/mole
Number of hydrogen atoms = approximately 2.64 × 1025 hydrogen atoms.
What effect does the water temperature have on solution rate hypothesis?
Katie rolls a toy car off the end of a table
? A B C D
its c just took test
Which statement about the orinoco river is true.
A. IT FLOWS THROUGH ECUADOR
B. IT IS SECOND LONGEST RIVER IN SOUTH AMERICA
C. IT FLOWS THROUGH VENEZUELA
D. IT EMPTIES INTO THE PACIFIC OCEAN
How many molecules of carbon dioxide are in 95 grams of carbon dioxide (co2)?
Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite
Sulfurous acid and lithium hydroxide react in a neutralization reaction to form water and lithium sulfite. The balanced chemical equation is H2SO3 + 2LiOH -> Li2SO3 + 2H2O.
Explanation:The question asks for a balanced equation that demonstrates the reaction between sulfurous acid (H2SO3) and lithium hydroxide (LiOH). This reaction is typically categorized as a type of acid-base reaction called neutralization, where an acid reacts with a base to produce salt and water. Here, sulfurous acid acts as the acid, and lithium hydroxide is the base. The products are lithium sulfite and water.
The balanced chemical equation is as follows: H2SO3 + 2LiOH -> Li2SO3 + 2H2O
This equation demonstrates that one molecule of sulfurous acid reacts with two molecules of lithium hydroxide to produce one molecule of lithium sulfite and two molecules of water.
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If a neutral atom of boron (B) contains 5 protons, 5 electrons and 6 neutrons, what is the mass number of this atom? (2 points)
21
11
10
5
The biosphere is made up of parts of which three layers? thermosphere, stratosphere, and lithosphere hydrosphere, thermosphere, and atmosphere lithosphere, stratosphere, and mesosphere hydrosphere, lithosphere, and atmosphere
Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. In an automobile engine, fuel is burned to convert ________energy into heat energy. The ________energy is then changed into ________energy.
Answer: 1. Chemical energy
2. Mechanical energy
Explanation:
The law of conservation of energy states that energy changes from one form of energy to another but it is neither created nor destroyed.
The fuel consists of chemical energy which when burn results in the release of energy in the form of heat or thermal energy. The heat energy is converted into mechanical energy by the internal machinery of the automobile engine. This mechanical energy is used to run the automobile.
Using the data in the table, which of the conjugate acids below is the weakest acid?
The weakest acid is the one with the weakest conjugate base. It won't ionize completely in water and operates under the inverse proportionality principle between Ka and Kb.
Explanation:According to the principle of Bronsted-Lowry acids, the strength of an acid is determined by its ability to lose or donate a proton. This proton is then accepted by its conjugate base. When dissolving in water, a strong acid tends to lose its proton completely, hence it is completely ionized, and produces a large number of hydronium ions. Its conjugate base is weak, as it cannot accept many protons due to the acid's complete ionization. On the contrary, a weak acid only partially ionizes, hence, its conjugate base is strong, being able to accept many protons. Furthermore, there's an inverse relation between Ka (acid dissociation constant) and Kb (base ionization constant), meaning the stronger the acid, the weaker the base, and vice versa.
To find out the weakest acid in a list of conjugate acid-base pairs, we need to look for the acid with the weakest conjugate base listed above water in the table, in Figure 14.8. This indicates that the acid is weak and doesn't readily give up protons when dissolved in water.
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The atoms of which elements are least likely to form chemical bonds? Check all that apply.
phosphorus (P)
helium (He)
sodium (Na)
carbon (C)
oxygen (O)
neon (Ne)
argon (Ar)
Answer:
A
Explanation:
A chemical bond is classified as a covalent bond if it involves the transfer of electrons.
a. True
b. False
Answer:
true
Explanation:
because i said so
Which of the following is NOT an assumption of the kinetic theory of gases?
Gas particles are in constant random motion.
The volume of individual gas particles is zero.
The particles in a gas are attracted to each other.
Gas particles collide without losing energy.
The correct answer is
The particles in a gas are attracted to each other.
:)
The following is NOT an assumption of the kinetic theory of gases : The particles in a gas are attracted to each other.
Further explanationKinetic Molecular Theory (KMT) states that a gas consists of molecules that move at a constant and random speed. The collisions between molecules are perfectly elastic so that no energy is wasted.
The molecules move in straight lines until they collide
Energy because this motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex] \displaystyle KE = \frac {1} {2} mv ^ 2 [/tex]
The average kinetic energy value is only affected by temperature changes. The higher the temperature, the average kinetic energy of the molecule increases
This molecule is very small when compared to the distance between molecules, so the volume of gas contains mostly empty space
Gas particles move randomly (both speed and direction, as vector)
From the question :
Gas particles are in constant random motion.Particle motion creates kinetic energy.
they collide between particles or the walls of its container
The volume of individual gas particles is zero.The volume of the individual particles is negligible
The particles in a gas are attracted to each other.The motion of each particle is independent (no attraction or repulsion)
Gas particles collide without losing energyThe collisions are elastic, so there is no loss of kinetic energy, only transferred from between particles
Learn moreinertia affect during a collision
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Keywords: Kinetic Molecular Theory, Collisions, The average kinetic energy , gas molecule
How does the rate of effusion of sulfur dioxide, so2, compare to that of helium (he)? (note: the molar masses are so2 = 64 g/mol; he = 4.0 g/mol.)?
Answer : The rate of effusion of helium gas is four times of the rate of effusion of sulfur dioxide gas.
Solution : Given,
Molar mass of sulfur dioxide gas = 64 g/mole
Molar mass of helium gas = 4.0 g/mole
According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.
[tex]R\propto \sqrt{\frac{1}{M}}[/tex]
or,
[tex]\frac{R_1}{R_2}=\sqrt{\frac{M_2}{M_1}}[/tex]
where,
[tex]R_1[/tex] = rate of effusion of sulfur dioxide gas
[tex]R_2[/tex] = rate of effusion of helium gas
[tex]M_1[/tex] = molar mass of sulfur dioxide gas
[tex]M_2[/tex] = molar mass of helium gas
Now put all the given values in the above formula, we get
[tex]\frac{R_1}{R_2}=\sqrt{\frac{4.0g/mole}{64g/mole}}[/tex]
[tex]\frac{R_1}{R_2}=\frac{1}{4}[/tex]
Therefore, from this we conclude that, the rate of effusion of helium gas is four times of the rate of effusion of sulfur dioxide gas.
Oxyacids contains at least one h+ and an oxyanion. the " sulfurous " oxyacid contains the oxyanion ________.
Answer:
Oxygenation Nitrite
Explanation:
When an atom loses one electron, the charge on its ion is _____?
Final answer:
When an atom loses one electron, it becomes a positively charged ion, known as a cation, with a +1 charge due to more protons than electrons.
Explanation:
When an atom loses one electron, the charge on its ion becomes positively charged. This occurs because there are now more protons than electrons in the ion. Atoms that lose electrons are referred to as cations. For example, when a neutral sodium atom loses one electron, it transforms into Na+, which signifies a cation with a +1 charge. The loss of electrons results in a higher number of protons than electrons, leading to a positive charge on the resulting ion, making sodium a cation, Na+, with a +1 charge. This process is essential for forming ions in chemistry, as ions are atoms that have gained or lost electrons, resulting in an imbalance that gives them a net charge.
Will the ph of a solution of nh4cn be >7, <7, or =7?
The combustion of ammonia in the presence of excess oxygen yields no2 and h2o: 4 nh3 (g) + 7 o2 (g) → 4 no2 (g) + 6 h2o (g) the combustion of 43.9 g of ammonia produces ________ g of no2.
The combustion of 43.9 g of ammonia produces 118.6 g of NO2.
Explanation:To determine the mass of NO2 produced from the combustion of 43.9 g of ammonia, we first need to calculate the moles of ammonia used. The molar mass of ammonia (NH3) is 17.03 g/mol. We can use the molar ratio from the balanced equation to find the moles of NO2 produced.
4NH3 (g) + 7O2 (g) → 4NO2 (g) + 6H2O (g)
From the balanced equation, the molar ratio between NH3 and NO2 is 4:4. Therefore, the moles of NO2 produced is also equal to the moles of NH3 used. Finally, we can calculate the mass of NO2 produced by multiplying the moles of NH3 used by the molar mass of NO2 (46.01 g/mol).
Mass of NO2 produced = Moles of NH3 used × Molar mass of NO2
Now let's plug in the numbers:
Mass of NO2 produced = 43.9 g × (46.01 g/mol / 17.03 g/mol) = 118.6 g
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how do you think earths internal processes cause surface features on earth as large as mount everest
Explanation:
The mountain ranges like the Himalayas, where Mt. Everest is situated, and other bigger peaks are the outcomes of plate tectonics, resulting mainly due to huge slabs of Earth's crust colliding with each other. The point where collision takes place is known as a subduction zone, in which one of the subducts or slabs goes underneath, and the other gets on the top. When such kind of phenomenon take place, the push of one slab against the other, and the friction resulting on both the slabs lead to the formation of mountain ranges with the peaks like of Mt. Everest.
At a certain temperature, the equilibrium constant, kc, for this reaction is 53.3. at this temperature, 0.500 mol of h2 and 0.500 mol of i2 were placed in a 1.00-l container to react. what concentration of hi is present at equilibrium?
equation: h2 + i2 = 2hi
The concentration of HI present at equilibrium is approximately 1.13 M.
To find the equilibrium concentration of HI in the reaction between hydrogen (H₂) and iodine (I₂) to form hydrogen iodide (HI), we can follow these steps:
The balanced chemical equation for the reaction is:
[tex]H_2(g) + I_2(g) \rightleftharpoons 2HI(g)[/tex]
The given equilibrium constant, K_c, for this reaction at a certain temperature is 53.3.
In this scenario, we have:
0.500 moles of H₂ 0.500 moles of I₂ Volume of the container = 1.00 LThis means that the initial concentrations of H₂ and I₂ are:
[tex][H_2]_{initial} = \frac{0.500 \text{ moles}}{1.00 \text{ L}} = 0.500 ext{ M}[/tex]
[tex][I_2]_{initial} = \frac{0.500 \text{ moles}}{1.00 \text{ L}} = 0.500 ext{ M}[/tex]
Let’s denote the change in concentration of H₂ and I₂ at equilibrium as -x (since they will decrease) and the increase in concentration of HI as +2x (because 1 mole of each H₂ and I₂ produces 2 moles of HI). The changes can be summarized as:
[tex][H_2] = 0.500 - x[/tex]
[tex][I_2] = 0.500 - x[/tex]
[tex][HI] = 0 + 2x[/tex]
At equilibrium, we can express K_c:
[tex]K_c = \frac{[HI]^2}{[H_2][I_2]}[/tex]
Substituting the equilibrium concentrations into the expression:
[tex]53.3 = \frac{(2x)^2}{(0.500 - x)(0.500 - x)}[/tex]
This simplifies to:
[tex]53.3 = \frac{4x^2}{(0.500 - x)^2}[/tex]
Cross-multiplying gives:
[tex]53.3(0.500 - x)^2 = 4x^2[/tex]
Expanding the left side:
[tex]53.3(0.250 - x + x^2) = 4x^2[/tex]
This leads to:
[tex]13.325 - 53.3x + 53.3x^2 = 4x^2[/tex]
Combining terms yields:
[tex]49.3x^2 - 53.3x + 13.325 = 0[/tex]
To solve this quadratic equation, we apply the quadratic formula:
[tex]x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}[/tex]
Where:
Calculating the discriminant:
[tex]b^2 - 4ac = (-53.3)^2 - 4(49.3)(13.325)[/tex]
Let's calculate
[tex]= 2840.89 - 2631.89 = 209.00[/tex]
Now substituting back into the formula, we compute:
[tex]x = \frac{53.3 \pm \sqrt{209}}{2(49.3)}[/tex]
Finding the positive root:
[tex]x \approx 0.563 \text{ (taking only the positive root for concentration)}[/tex]
We can now calculate the final concentration of HI:
[tex][HI]_{eq} = 2x = 2(0.563) \approx 1.126 ext{ M}[/tex]
Consider the chemical equilibrium of the reaction. NH4OH(aq) mc014-1.jpg NH4+(aq) + OHmc014-2.jpg(aq) What will happen to the chemical equilibrium if NH4Cl is added to this solution? The chemical equilibrium will shift to the right. The chemical equilibrium will not shift. The chemical equilibrium will shift to the left. The chemical equilibrium will be lost.
Le chateliers principle is applicable only to reversible reaction not to the irreversible reaction . The equilibrium will shift to the left side of the reaction that is towards the reactant on increasing the amount of NH₄Cl .
What is Le chatelier's principle?According to le chatelier's principle if any change in temperature, pressure or concentration of reactant is brought in the reaction that is in equilibrium then the the equilibrium will shift so as to tend to counteract the effect of the change.
The balanced reaction is
[tex]\rm NH_4OH(aq) \rightleftharpoons NH_4^+(aq) + OH^-(aq)[/tex]
If we add [tex]\rm NH_4Cl[/tex] to the reaction the number of ions of [tex]NH_4^+[/tex] increases in the product side and hence the reaction will counteract to change and equilibrium shift towards left.
Therefore, the equilibrium will shift to the left side of the reaction that is towards the reactant on increasing the amount of NH₄Cl.
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What is the use of calcium chloride?
Which of these is a combustion and synthesis reaction?
A. CH4 + 2 O2 → CO2 + 2 H2O
B. Mg + O2 → MgO
C. H2O → H2 + O2
D. CaO → Ca + O2
Answer:
It's B!
Explanation:
Which term describes the degree to which an element attracts electrons? view available hint(s) which term describes the degree to which an element attracts electrons? oxidation. reduction. electronegativity. polarity?
A molecule has the formula ab3 and the central atom is in a different plane from the surrounding three atoms. its molecular shape is __________.
Answer: trigonal pyramidal
What steps are always part of both the process of technological design and the process of scientific investigation?
Both technological design and scientific investigation involve making observations, identifying questions, researching, formulating hypotheses, and testing them.
The steps that are always part of both the process of technological design and the process of scientific investigation include: making observations, identifying a question to be answered, conducting research on existing knowledge, forming a hypothesis, and then testing that hypothesis.
It is important in both processes to document each step, provide justification for decisions, and communicate the results clearly. In doing so, the science connection behind each choice and the justification for the selected solution, based on factors and weights of requirements and constraints, should be well articulated.