If you have a solid like ice (solid water), which of the following substances below would most closely resemble the structure of ice? indium cadmium quartz topaz
What net ionic equation can be derived from this complete ionic equation? 2fe3+(aq) + 6cl– (aq) + 6na+(aq) + 3co32– (aq) → fe2(co3)3(s) + 6cl– (aq) + 6na+(aq)?
The atomic number of this element is 9 and its mass is 20. how many neutrons does this element have?
Answer:
11 neutrons
Explanation:
Mass no. = 20
atomic no. = 9
no. of neutrons = mass number - atomic number
= 20 - 9
= 11 neutrons
A substance has a volume of 10.0 cm3 and a mass of 89 grams. What is its density?
Answer:
Density of the substance = 8.9 g/cm³
Explanation:
The volume of the substance = 10 cm³
Mass = 89 gm
Density = mass / volume = 89 gm / 10 cm³ = 8.9 g/cm³
What statement correctly describes the key features of the graph of f(x) = 4(1/2)^(x + 1 )− 3
Y-intercept of (0, −1), starts up on the left, gets closer to y = −3 on the right
Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right
Y-intercept of (0, 1), starts up on the left, gets closer to y = −3 on the right
Y-intercept of (0, 1), starts down on the left, gets closer to y = −3 on the right
Answer:
The correct option is:
"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"
Explanation:
You have the following function:
[tex]f(x)=y=4*(\frac{1}{2}) ^{x+1} -3[/tex]
The intersection on the "y" axis implies that the value at "x" must be zero. So, to calculate the value in "y" you must replace "x" with the value 0 and perform the corresponding calculations:
[tex]y=4*(\frac{1}{2}) ^{0+1} -3[/tex]
[tex]y=4*(\frac{1}{2}) -3[/tex]
[tex]y=2 -3[/tex]
[tex]y=-1[/tex]
Being (x, y) a point on the graph, the y- intercept is (0,-1).
This function is an exponential function function, whose form corresponds to the general expression:
[tex]g(x)=k*a^{x-h} +b[/tex]
Where:
If a is greater than 1 (a> 1), the function is increasing. On the other hand, if a is less than 1 (a <1), the function is decreasing. b is the independent term of the equation and determines the Horizontal Asymptote, which is a horizontal line to which the function is approaching indefinitely. In this case it is the value -3.The graph of the function is shown in the attached image.
The correct option is:
"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"
According to the collision theory what two factors must be true to successfully result in a reaction
Explanation:
According to collision theory, more is the number of collisions between the particles of reactants more will be the rate of a reaction.
Two important factors of collision theory are as follows.
Sufficient energyOrientationSufficient energy: Molecules participating in a chemical reaction should have sufficient amount of energy so that they can overcome activation energy barrier and participate effectively in the reaction.
Orientation: Collision between the molecules should take place with proper orientation so that they successfully result in the formation of products.
According to the collision theory, the two factors that must be true for a reaction to occur are sufficient energy and proper orientation of reactant particles.
What is the collision theory of reactions?The collision theory states that a reactant molecules must collide effectively with energy greater than or equals to activation energy for products to be formed.
According to the collision theory, the two factors that must be true are:
reactant molecules must be oriented properly the reactant molecules must have sufficient energyTherefore, sufficient energy and proper orientation of particles is necessary for product formation.
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If nickel is added to copper sulfate solution, the nickel will replace the copper. write the balanced equation
Answer:-
Ni + CuSO4 --> NiSO4 + Cu
Explanation:-
The symbol for Nickel is Ni.
The Symbol for copper is Cu.
Copper Sulphate has the formula CuSO4.
If Nickel replaces copper from copper sulphate then nickel sulphate is formed.
Nickel sulphate has the formula NiSO4.
So the equation becomes
Ni + CuSO4 --> NiSO4 + Cu
Calcium fluoride (CaF2) has a solubility constant of 3.45 x 10-11
. What is the molar solubility of CaF2 in water?
4.15 x 10-6 M
5.87 x 10-6 M
2.05 x 10-4 M
3.26 x 10-4 M
the basic organizational feature of the periodic table of elements
True or False no two elements have the same atomic number.
How many electrons are transferred in the ionic bond between sodium and chlorine in nacl?
Answer:
1
Explanation:
Just got it right on the quiz.
That is the exchange to fill.
Hope this helps.
25 g of ethyl alcohol is dissolved in 100 ml of water (density = 0.99993 at 20 oc). what is the % w/w for the ethyl alcohol in the resulting solution?
Why does a compound have characteristic properties?
Answer: Because of the arrangement of atoms in a compound.
Explanation:
A compound is defined as the chemical specie which is formed by the combination of two or more different type of atoms. For Example: [tex]H_2O,O_2[/tex] etc...
A compound has different physical and chemical properties than corresponding elements because of change in identity. For Example: Hydrogen and oxygen are gases, but the compound formed by the combination of these two that is water is liquid.
In a chemical compound, elements are combined in a fixed ratio of their masses.
Hence, a compound has characteristic property because of the arrangement of atoms in a compound
identify solute and solvent in 80 solution of ethyl alcohol with water
calcium, magnesium, and phosphorus are all examples of
You are given a clear solution of KNO3. Using 3 – 4 sentences (in your own words) explain how you would determine if the solution is unsaturated, saturated or supersaturated.
What volume is needed to make a 4.0 molar solution holding 12 moles of solute? 3.0 liters 48 liters 12 liters 4.0 liters
Answer: Option (a) is the correct answer.
Explanation:
Molarity is defined as the number of moles present in a liter of solution.
Mathematically, Molarity = [tex]\frac{\text{no. of moles}}{volume}[/tex]
Since, it is given that molarity is 4.0 molar or 4.0 m/L and no. of moles is 12 moles.
Therefore, calculate volume as follows.
Molarity = [tex]\frac{\text{no. of moles}}{volume}[/tex]
4.0 m/L = [tex]\frac{12 moles}{volume}[/tex]
volume = 3 L
Hence, we can conclude that volume of the given solution is 3 liters.
Brainliest if answered in the next 5m
A weak acid, like Hydrofluoric acid, can be dangerous if _____. Select all that apply.
concentrated
used without adult supervision
used without goggles
used without gloves
tasted
In the sun, two hydrogen nuclides react together to make an atom of helium. the process releases energy. which type of reaction is this
Answer:
Fusion.
Explanation:
The core squeezes together so tightly that four hydrogen nuclei combine to form one helium atom. This is the textbook definition of nuclear fusion.
How many moles of electrons are required to reduce one mole of nitrogen gas (N2) to two moles of nitrogen ions (N3-)?
substance which allows energy to pass through it
He approximate molar concentration of several chemicals are given. find the ph of each. use the calculator and round to the nearest tenth, if necessary. oven cleaner: [h+] = 10−13 ph = water: [h+] = 0.0000007 ph = blood: [h+] = 0.00000004 ph = vinegar: [h+] = 0.0063 ph =
Answer:
oven cleaner: ph=13
water: ph=6.2
blood: ph=7.4
vinegar ph=2.2
Explanation:
got it right on ed
The pH values for the given solutions are calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions. The pH values for an oven cleaner, water, blood, and vinegar are found to be 13.0, 7.2, 7.4, and 2.2 respectively.
Explanation:To calculate the pH of a solution, we use the formula pH = -log[H+]. Here [H+] represents the molar concentration of hydrogen ions in moles per liter (M).
Oven cleaner: With [H+] = 10-13 M, we find pH as follows:
pH = -log(10-13) = 13.0
Water: For [H+] = 0.0000007 M or 7×10-7M:
pH = -log(7×10-7) = 7.2
Blood: Given [H+] = 0.00000004 M or 4×10-8M:
pH = -log(4×10-8) = 7.4
Vinegar: With [H+] = 0.0063 M:
pH = -log(0.0063) = 2.2
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What reactions are responsible for the glow and heat from the sun? nuclear fission nuclear fusion chemical reactions atomic disintegration?
What happens to the atomic mass of the elements moving from left to right within a period?
As you move across a period, the atomic mass increases because the atomic number also increases. ... The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.
Moving from left to right across a period on the periodic table, the atomic mass of the elements generally increases. This is due to an increase in the number of protons and neutrons in the nucleus. For instance, in the second period, the atomic mass of Lithium is less than that of Neon.
Explanation:As you move from left to right across a period on the periodic table, there is an increase in the atomic mass of the elements. This happens because the number of protons, which contribute to the atomic mass, in the nucleus of an atom increases. The atomic mass is approximated by the mass number, which is the sum of the number of protons and neutrons in an atom's nucleus. Therefore, as the number of protons (and usually neutrons) increases, the atomic mass of the elements also generally increases.
For example, in the second period, the atomic mass of Lithium (Li) is about 7 amu, while the atomic mass of Neon (Ne), at the end of the same period, is about 20 amu.
Thus, when moving from left to right within a period of the periodic table, the atomic mass generally increases due to an increase in the number of protons and neutrons in the nucleus.
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1.64 mol of nickel at 150.13ºC is placed in 1.00 L of water at 25.09ºC. The final temperature of the nickel-water mixture is 26.34ºC. What is the specific heat of nickel?
a. 0.439 J K-1 mol-1
b. 0.554 J K-1 mol-1
c. 2.28 J K-1 mol-1
d. 25.7 J K-1 mol-1
e. 31.6 J K-1 mol-1
Which type of storage facility is assumed to be safe for long term storage of nuclear waste products
Answer:
Deep geological disposal method
Explanation:
A deep geological disposal method is the most efficient method in disposing of the waste materials produced from a nuclear plant. These materials are disposed at a depth of usually about 200 to 1000 m below the surface and also from 1500 m to 5500 m below the surface. And it has to be below the groundwater level so that it does not contaminate it. So necessary precautionary measures are needed to be taken.
This method is used for the disposal of high and intermediate levels of nuclear waste often represented by HLW and ILW respectively.
Carbon monoxide poisoning is sometimes mistakenly identified as what?
When we breathe red blood cells bond to the oxygen but when we inhale carbon monoxide (CO), it sticks to red blood cells and block the oxygen and suffocation occurs. It is also known as “Silent Killer”.
Headaches, nausea and fatigue are some of early symptoms of carbon monoxide poisoning. It is sometimes mistakenly identified as “Flu”. Because this gas cannot be detected at home. It is produced by common household appliances, if not proper ventilated, such as water heaters, generators, cars etc.
Carbon monoxide poisoning and acute toxicity are related and often confused due to similar symptoms such as headache, weakness, and even death.
Carbon monoxide poisoning occurs due to inhaling excessive levels of carbon monoxide (CO), which can lead to symptoms like headache, dizziness, weakness, and even death. This poisoning is sometimes mistakenly identified as acute toxicity due to exposure to carbon monoxide.
Loss of consciousness, arrhythmias, seizures, and even death can result from large CO exposures.Long-term complications may include chronic fatigue, memory issues, and movement problems.Methanol is an important solvent. it is also an important starting material for the synthesis of other molecules. most methanol today is obtained from the
Calculate the percent ionic character of a chemical bond between beryllium and fluorine
The percent ionic character of a chemical bond, such as between beryllium and fluorine, can be determined using the difference in electronegativity between the two elements based on Pauling's scale. Most bonds exhibit partial ionic character, as they fall within the spectrum between purely ionic and purely covalent.
Explanation:The percent ionic character of a chemical bond refers to the degree to which the bond exhibits ionic properties. In an ideal ionic bond, electrons are completely transferred from one atom to another. However, in reality, most bonds fall within the spectrum between purely ionic and purely covalent, exhibiting partial ionic character.
In the case of the bond between beryllium and fluorine, you can determine the percent ionic character by making use of Pauling's electronegativity values. First, you would calculate the difference in electronegativity between the two elements. Then, you use this difference to estimate the percent ionic character based on Pauling's scale.
For example, consider the hypothetical molecule HCl mentioned in the reference. Supposed that HCl was completely ionic, its molecular dipole moment was calculated to be 6.09 D. The experimentally measured bond moment, however, turned out to be 1.03 D. The percent ionic character was hence calculated as the bond moment divided by the theoretical fully ionic bond moment, multiplied by 100%. The result was 17%.
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what are 2 key characteristics of a good scientific investigation