your seven-year-old neighbor has just developed a new interest in science and she want to learn all that she can.you know many examples of science are all around you so you decide to to take her on a house tour of your house or your nebiorhoood to point them out.
Imagine a beaker divided down the center by a rigid membrane that is freely permeable to water but impermeable to glucose. side 1 contains a 10 percent glucose solution and side 2 contains the same volume of pure water. at equilibrium, what will be the situation
What mass of butane, c4h10, is required to heat 0.35 gallon of h2o from 22°c to 100°c?
What do melted ice cooling lava and boiling water have in common?
Power plants release sulfur dioxide and nitrogen oxides into the atmosphere where they combine with water vapor to form _____.
ozone
acid precipitation
particulates
carbon monoxide
Answer:
The correct option is acid precipitationExplanation:
When sulfur dioxide react with water vapors, they form sulphuric acid. Similarly, when NOx reacts with water vapors to form HNO2 and HNO3. So these acid cause the rain water into acidic rain.How do you write zinc chloride as a chemical formula?
If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at , what is the total pressure of the system? 1,329 atm 17.5 cm hg 639 torr 1.75 atm none of these
What can you predict about the properties of xenon and helium, both in group 18 in the periodic table? why?
Elements in the same column or group have similar properties in the periodic table. Helium and xenon have similar properties because they are in the same group.
What is an element ?A chemical element is a type of atom with a specific number of protons in its nucleus, including the pure substance made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction.
Group 18 elements are gases that are chemically unreactive, meaning they do not form many compounds. As a result, the elements are referred to as inert gases. Noble gas elements, like the other group elements, exhibit trends in their physical and chemical properties.
Group 18 (Nobel Gases) elements are the least reactive. They had already finished their octet. As a result, they prefer not to gain or lose electrons. As a side note, Argon, Krypton, and Xenon are all octet rule exceptions.
Thus, Elements in the same column or group have similar properties in the periodic table.
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Why are hydrogen bonds important for the properties of water?
Water binds to each other with a strong attraction called a hydrogen bond. Water is incredibly cohesive as a result. Every day, water drops and streams provide visual proof of water's cohesion.
What is hydrogen bond ?Not a covalent link to a hydrogen atom, hydrogen bonding is a unique kind of dipole-dipole interaction between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.
When a highly electronegative atom's lone pair interacts with the hydrogen atom in an N-H, O-H, or F-H bond, they form a specific type of dipole-dipole interaction known as hydrogen bonding.
When a hydrogen atom that is connected to an electronegative atom moves toward another electronegative atom nearby, powerful intermolecular forces called hydrogen bonds are produced. The hydrogen bond acceptor's electronegativity will rise, resulting in a stronger hydrogen bond.
Thus, Water binds to each other with a strong attraction called a hydrogen attractive force.
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The speed of light has been measured to be about ____ miles a second.
186,000
1,000,000
1,100
10,000
The solubility constant of your compound depends on
The forces of attraction that hold oppositely charged ions together in ionic compounds are called _______________.
How reactive is an atom of Sodium(Na) and why?
Question 1 options:
Sodium (Na) is not very reactive because it does not have a full valence shell.
Sodium (Na) is not very reactive because it can only bond with Chlorine (Cl) to become salt.
Sodium (Na) is very reactive because it does not have a full valence shell.
Sodium (Na) is very reactive because it does not have enough protons in the nucleus.
If 32 ml of 7.0 m h2so4 was spilled, what is the minimum mass of nahco3 that must be added to the spill to neutralize the acid?
The complete balanced reaction of this neutralization reaction is:
H2SO4 + 2NaHCO3 --> 2CO2 + 2H2O + Na2SO4
Then we calculate the moles of H2SO4 that was spilled:
moles H2SO4 = 7 mole/L * 0.032 L = 0.224 mole
From the reaction, we see that 2 moles of NaHCO3 is required for every mole of H2SO4, hence:
moles NaHCO3 = 0.224 * 2 = 0.448 mole
The molar mass of NaHCO3 is 84 g/mol. Hence the mass is:
mass NaHCO3 = 0.448 * 84
mass NaHCO3 = 37.632 grams
The minimum mass of NaHCO3 that must be added to neutralize the spilled H2SO4 is 37.632 grams.
Explanation:To determine the minimum mass of NaHCO3 needed to neutralize the spilled H2SO4, we can use stoichiometry.
The balanced equation for the reaction between H2SO4 and NaHCO3 is:
H2SO4 (aq) + 2NaHCO3(aq) → Na2SO4 (aq) + 2CO2 (g) + 2H2O (l)
From the equation, we can see that 1 mole of H2SO4 reacts with 2 moles of NaHCO3. We are given the volume (32 mL) and concentration (7.0 M) of the H2SO4, so we can calculate the number of moles of H2SO4:
Moles H2SO4 = volume (L) x concentration (M) = 32 mL / 1000 mL/L x 7.0 M = 0.224 moles H2SO4
Now, we can use the stoichiometry of the reaction to calculate the minimum mass of NaHCO3 needed to neutralize the acid. Since the molar ratio of H2SO4 to NaHCO3 is 1:2, we can set up the following conversion:
0.224 moles H2SO4 x (2 moles NaHCO3/1 mole H2SO4) x (84.0 g NaHCO3/1 mole NaHCO3) = 37.632 g NaHCO3
Therefore, the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid is 37.632 grams of NaHCO3.
Work done after rutherford's gold foil experiment demonstrated that the nucleus contained ________.
What color does cobalt-oxide produce?
a. blue-violet
b. red
c. yellow
d. green?
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The color of cobalt-oxide is blue-violet. The CoO is a metallic coloring oxide that produces blue in glazes at all temperatures.
Therefore, the correct option is option A.
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The magnitude of torque is the product of which two variables
Torque is physical quantity defined in terms of force and distance. It is the product of force and the perpendicular distance. Thus the two variables are force and perpendicular distance.
What is torque?Torque can be defined as the rotational analogue of linear force. It can also called as rotational force or turning effect. The force that can make an object to rotate along an axis is measured in torque.
Similar to how force accelerates an item in linear kinematics, torque accelerates an object in an angular direction.Torque is a vector quantity. The force acting on the axis determines the direction of the torque vector.
The definition of torque is the product of the force's strength and the angle at which the force's line of action is perpendicular to the axis of rotation.
The lowercase Greek letter tau is commonly used as the torque symbol . Moment of force is frequently represented by the letter M.
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What is formed when two or more atoms are held together by covalent bonds?
A molecule is formed when two or more atoms are held together by covalent bonds. These bonds are based on the sharing of electron pairs between atoms. Water (H2O) is an example of a molecule formed through covalent bonding.
Explanation:When two or more atoms are held together by covalent bonds, a molecule is formed. Covalent bonds are a type of chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs. An example of a molecule formed through covalent bonding is water (H2O), where one oxygen atom shares electron pairs with two hydrogen atoms.
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The vapor pressure of dichloromethane, c h 2 c l 2 , at 0 ∘ c is 134 mmhg . the normal boiling point of dichloromethane is 40. ∘
c. calculate its molar heat of vaporization.
At the same conditions of pressure and temperature ammonia gas is less dense than air why is this true
Lipids with high polyunsaturatd fatty acid content are ____________ at room temperature.
The subatomic particles that play the key role in determine the properties of an element electrons
Predict the precipitate produced by mixing an Al(NO3)3 solution with a NaOH solution. Write the net ionic equation for the reaction. (Include the states of matter.)
Mixing an Al(NO₃)₃ solution with a NaOH solution results in the formation of a white precipitate of aluminum hydroxide, Al(OH)₃. The net ionic equation for the reaction is Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s), showing only the ions involved in the formation of the precipitate.
When an Al(NO₃)₃ solution is mixed with a NaOH solution, a precipitate will form. This precipitate is aluminum hydroxide, Al(OH)₃. To write the net ionic equation for this reaction, we first need to consider the full molecular equation:
Al(NO₃)₃(aq) + 3NaOH(aq) → Al(OH)₃(s) + 3NaNO₃(aq)
Now, we can write the complete ionic equation, showing all the ions present in the reaction:
Al³⁺(aq) + 3NO³⁻(aq) + 3Na⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) + 3Na⁺(aq) + 3NO³⁻(aq)
The net ionic equation only shows the species that actually change during the reaction. Spectator ions (Na⁺ and NO³⁻) are not included:
Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)
What is the ratio of Al 3+ ions to S 2- ions in a neutral compound?
Answer:
The ratio of aluminium to sulfur is 2:3
Explanation:
The ratio of the elements of the neutral compound can be computed from the ionic charges that makes up the compound. The element that makes up the compound is aluminium and sulfur. From the ions aluminium is the cation with a charge of 3+ . The aluminium ion is the cations because it loses 3 electrons from the bonding between it and sulfur. The sulfur is the anion as it gains electrons from the cations.
Aluminium has a charge of 3+ and sulfur has a charge of 2- . The atom of element that makes up the neutral compound can be computed when you cross multiply the charges.
Al3+ and S2-
cross multiply the charges
Al2S3.
The ratio of aluminium to sulfur is 2:3
What occurs when the temperature of 10.0 grams of water is changed from 15.5 degrees celsius to 14.5?
Final answer:
When the temperature of 10.0 grams of water decreases from 15.5°C to 14.5°C, it loses 41.84 Joules of heat, calculated using the specific heat capacity of water.
Explanation:
When the temperature of 10.0 grams of water is changed from 15.5 degrees Celsius to 14.5 degrees Celsius, the process involves a decrease in the water's thermal energy. To compute the amount of heat lost, the specific heat capacity of water is applied, which is 4.184 J/(g °C). The equation used is Q = mcΔT, where Q is the heat transferred, m is the mass of the water, c is the specific heat capacity, and ΔT is the change in temperature.
By plugging the values into the equation: Q = (10.0 g)(4.184 J/(g °C))(14.5°C - 15.5°C) = -41.84 J. This result indicates that the water loses 41.84 Joules of heat as its temperature decreases by 1 degree Celsius.
Large quantities of tritium were released into the atmosphere in the 1950s and 1960s during atmospheric nuclear testing. This tritium fell back to earth in precipitation. Assume that the precipitation joins runoff that goes directly to an open watershed. Where would you expect to find the tritium next? A. In a closed watershed B. In the atmosphere C. In an iceberg D. In the ocean
Answer: D. In the ocean
A watershed can be defined as regions of land where all surface water drains into the same place. It is a land that is occupied with water drained from interconnected rivers, and lakes. These drainage streams may aggregate in the ocean.
According to the above information the open watershed system likely to dispense off tritium in the ocean because the open watershed water may flow and combine with other reservoirs of water like ocean.
How did the rate of the reaction change over time in the control reaction?
Which would be the best to neutralize a large acid spill in your school lab: sodium hydroxide or baking soda? Explain
To neutralize a large acid spill, sodium hydroxide, which is a strong base, would be more efficient than baking soda. However, due to the heat it generates when reacting with acids, precautions must be taken.
Explanation:The question refers to the neutralization of a large acid spill, which requires either sodium hydroxide (NaOH) or baking soda (sodium bicarbonate, NaHCO3). Both substances are bases and can neutralize acids, raising the pH level by providing hydroxide ions (OH-) that combine with the acid's hydrogen ions (H*) to produce water.
However, considering the large scale of the spill in a school lab situation, sodium hydroxide would be a more suitable choice as it is a stronger base and reacts more readily with acids, allowing it to neutralize more acid per gram than baking soda would. Moreover, sodium hydroxide is widely used in various industries to neutralize acidic solutions, reinforcing its effectiveness.
On the other hand, using baking soda also results in the production of carbon dioxide gas, which in a confined lab environment could present additional safety considerations. Notably, the reaction of sodium hydroxide also generates a significant amount of heat, so precautions would need to be taken in its application.
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Sodium hydroxide is the best substance to neutralize a large acid spill in your school lab. It reacts with acids to form water and a harmless salt.
Explanation:The best substance to neutralize a large acid spill in your school lab would be sodium hydroxide rather than baking soda. Sodium hydroxide, also known as lye or caustic soda, is a strong base that can effectively neutralize acids. It reacts with acids to form water and a salt.
When sodium hydroxide reacts with an acid, such as hydrochloric acid (HCl), the following reaction occurs:
NaOH + HCl → H2O + NaCl
This reaction results in the formation of water and sodium chloride (common table salt), which are both harmless substances. Hence, sodium hydroxide is the preferred choice for neutralizing a large acid spill in a school lab.
The total number of oxygen atoms indicated by the formula al2(cr2o7)3 is
The number of oxygen atoms on the given formula Al₂(Cr₂O₇)₃ is equal to 21.
What is the chemical formula?A chemical formula can be described as a way of presenting information about the chemical proportions of atoms that are present in a particular molecule or chemical compound. The chemical formula is written by using chemical element symbols, numbers, and also other symbols, such as dashes, brackets, commas, and plus (+) and minus (−) signs.
A chemical formula contains no words but may imply certain simple chemical structures. Chemical formulae are generally more limited in power than structural formulae and chemical names.
In a chemical formula, more than one atom of the same element is represented by subscripts. In the given formula of a chemical compound Al₂(Cr₂O₇)₃ the oxygen has two subscripts that multiply with each other and the total number of oxygen atoms in the formula is 7×3 = 21.
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In a neon tube, what occurs immediately after an atom is excited?