Hydrocarbons are chain-like or ring-like molecules made of carbon and ________ atoms.
The table shows the results of four surveys that randomly sampled 50 girls at a community center about their favorite sport at the center.
Swimming Basketball Soccer Total
Survey 1 16 15 19 50
Survey 2 15 15 20 50
Survey 3 7 35 8 50
Survey 4 14 18 18 50
Identify surveys that are likely biased. Based on the unbiased surveys, what percent of the girls at the community center are likely to choose swimming as their favorite sport?
14 %
23 %
26 %
30 %
Answer:
30%
Explanation:
Which of the following is the best conductor of electricity
Nacl (s)
Nacl (aq)
C6h12o6 (aq)
C6h12o6 (S)
Option B: NaCl (aq)
There are two important factors that make a compound a good conductor of electricity that is its state and number of charge particles.
Here, the substances in solid state do not conduct electricity due to unavailability of free ions as movement of free ions in a substance is responsible for electricity conduction.
Therefore, NaCl(s) and [tex]C_{6}H_{12}O_{6}(s)[/tex] do not conduct electricity.
Now, out of NaCl(aq) and and [tex]C_{6}H_{12}O_{6}(aq)[/tex], NaCl(aq) is a good conductor of electricity because in aqueous solution, NaCl completely dissociates into [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions. Due to the presence of these ions it is good conductor of electricity.
NaCl (aq) is the best conductor of electricity. Therefore, option B is correct.
When NaCl is dissolved in water, it dissociates into its constituent ions, Na+ and Cl-. These ions are electrically charged particles that can move freely in the solution. The presence of these mobile ions allows the solution to conduct electricity.
In an aqueous solution of NaCl, the positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) are attracted to the oppositely charged electrodes of an electrical circuit. When a voltage is applied across the solution, the ions are driven toward their respective electrodes. This movement of charged particles constitutes an electric current. Thus, option B is correct.
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What is the bond angle in a tetrahedral molecule? 120° 180° 109.5° 90°
The bond angle in a tetrahedral molecule is ideally 109.5° but can be slightly smaller in molecules like water and ammonia due to the presence of lone pairs of electrons.
Explanation:The bond angle in a tetrahedral molecule is 109.5°. However, it can differ slightly due to the effects of repulsion between atoms or if lone pairs of electrons are involved. For instance, in water, which has a tetrahedral structure, the angle is 104.5° due to the two lone pairs of electrons on the oxygen atom.
These lone pairs occupy more space, causing the bond angle to be slightly less than the ideal. Similarly, ammonia has a bond angle of 107.3° due to its one lone pair. Thus, while the ideal bond angle in a tetrahedral molecule is 109.5°, the presence of lone pairs can cause the angle to be slightly smaller.
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Question 1 unsaved the atoms of group b elements _____ electrons when they form ions. question 1 options: cannot be determined either gain or lose lose gain
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
The molarity of a solution of 5.0 g of kcl in 100. ml of solution is ________.
Answer: The molarity of solution is 0.67 M
Explanation:
To calculate the molarity of solution, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}[/tex]
We are given:
Mass of solute (KCl) = 5.0 g
Molar mass of potassium chloride = 74.55 g/mol
Volume of solution = 100 mL
Putting values in above equation, we get:
[tex]\text{Molarity of solution}=\frac{5g\times 1000}{74.55g/mol\times 100mL}\\\\\text{Molarity of solution}=0.67M[/tex]
Hence, the molarity of solution is 0.67 M
PLEASE HELP MEEEEE (using 98 points to post)
Given that the molal freezing point depression constant (kf) for methyl alcohol (CH3OH) is -0.83 oC/molal, how much will the freezing point of methyl alcohol be lowered if 46.0 g of glycerine (C3H8O3) is added to 1.00 kg of methyl alcohol? (must show work, correct unit and correct answer)
2.86 °C = (1) (1.86 °C kg mol-1) (x / 0.750 kg)
2.86 °C = (2.48 °C mol-1) (x)
x = 1.1532 mol
33.7 g / 1.1532 mol = 29.2 g/mol
The heating curve below shows the temperature change that occurs as a solid is heated. What is occurring at segment CD of the graph? (3 points)
A line graph showing the heating curve of a substance being heated from the solid phase all the way to the gas phase. From left to right across the x-axis, the different regions of the heating curve are labeled with variables A through F. First, there is an incline with a positive slope labeled AB, followed by a horizontal region labeled BC. Then there is another incline with a positive slope labeled CD, followed by another horizontal region labeled DE. The end of the heating curve shows another incline with a positive slope labeled EF.
boiling a liquid
melting a solid
heating a liquid
heating a solid
Which of the following objects does not decompose?
A) Tinfoil
B) Plastic Water Bottle
C) Lumber
D) Milk Carton
Final answer:
A) Tinfoil, which is made of aluminum, does not decompose as it is not an organic material. Plastic water bottles and milk cartons can take significant time to decompose due to their plastic components, while lumber, being organic, does decompose naturally.
Explanation:
The object that does not decompose among the ones listed is A) Tinfoil. Decomposition is a process that typically involves the breakdown of organic material by microorganisms. Tinfoil, which is made of aluminum, is not an organic material and thus does not decompose in the same way organic substances, like lumber, do. A plastic water bottle can take a very long time to decompose, often hundreds of years, but it can eventually break down, although not as readily as organic materials. A milk carton typically contains both paper, which is organic and degradable, and a plastic lining, which can take a considerable amount of time to decompose. As such, milk cartons often have components that can degrade and others that are very resistant to degradation. On the other hand, lumber, which is wood, will decompose over time as it is an organic material.
When the compound BaCl2 forms , what happens to the Ba and Cl ions
Answer : The correct answer is Ba²⁺ and Cl⁻ ions .
This can be explained using Solubility concept .
Solubility is defined as property referring to ability of a substance , SOLUTE , to dissolves in a SOLVENT . It is measured at maximum amount of solute that dissolves in solvent as equilibrium .
Solubility of any compound can be checked using Solubility Rule ( Image ).
BaCl₂ is salt of Chloride . Since the solubility rules says that salts if chlorides are soluble , Hence BaCl₂ is also soluble .
SO when BaCl₂ forms in aqueous solution , it again dissociates to forms ions since it is soluble in aqueous solution . It produced one Ba²⁺ ion and two ions of Cl⁻ .
The BaCl₂ dissociates as follows :
[tex] BaCl_2 (aq) \rightarrow Ba^2^+ (aq) + 2 Cl^- (aq) [/tex]
Hence even BaCl₂ forms but it remain as dissociated ionic form as Ba²⁺ and Cl⁻ ions.
When copper reacts with silver nitrate according to the equation, the number of grams of copper required to produce 432 grams of silver is -?
Final answer:
To produce 432 grams of silver from the reaction of copper with silver nitrate, 127.23 grams of copper are required according to stoichiometry and the mole ratio from the balanced equation.
Explanation:
To determine the number of grams of copper required to produce 432 grams of silver in the reaction with silver nitrate, we must first understand the balanced chemical equation:
Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
From this balanced equation, we can see that one mole of copper reacts with two moles of silver nitrate to produce one mole of copper(II) nitrate and two moles of silver. To solve the problem, we need three molar masses: that of copper (63.55 g/mol), silver nitrate (169.88 g/mol), and silver (107.87 g/mol). Using stoichiometry, we can set up the calculation as follows:
432 g Ag x (1 mol Ag / 107.87 g Ag) x (1 mol Cu / 2 mol Ag) x (63.55 g Cu / 1 mol Cu) = grams of Cu required
By calculating, we get:
432 g Ag / 107.87 g/mol Ag = 4.004 mol Ag
4.004 mol Ag x 1 mol Cu / 2 mol Ag = 2.002 mol Cu
2.002 mol Cu x 63.55 g/mol Cu = 127.23 g Cu
Therefore, 127.23 grams of copper are required to produce 432 grams of silver when copper reacts with silver nitrate according to the balanced equation.
According to the following electron structure, how many valence electrons do these fluorine atoms have? F= 1s12s22p5
Fluorine atoms have seven valence electrons according to their electron configuration, which is reflected in their belonging to Group 7A of the periodic table and is also depicted in their Lewis dot structure.
According to the given electron structure of fluorine (F=1s22s22p5), fluorine atoms have seven valence electrons. The electron configuration indicates that there are two electrons in the first energy level (1s2) and seven electrons in the second energy level (2s22p5). Since the second energy level is the outermost shell, these seven electrons are considered the valence electrons.
Fluorine belongs to Group 7A in the periodic table, which means it is expected to have seven valence electrons. This is confirmed by the electron configuration. These valence electrons are represented in a Lewis dot structure by placing seven dots around the symbol for fluorine (F).
The formula for carbohydrates is C n H 2n O n . Which statement accurately describes this general formula?
A_There are more carbon atoms than oxygen atoms.
B_There are twice as many carbon atoms as hydrogen atoms.
C_The ratio of the atoms is 1:1:2 in the carbohydrate formula.
D_There are twice as many hydrogen atoms as carbon atoms.
What type of information can one obtain by taking a mass spectrum of an organic molecule like dodecane?
The practice of concluding "do not reject h0" is preferred over "accept h0" when we
Which best explains how elements combine in different ways to produce compounds?
Elements combine in different ways to form compounds through chemical reactions, where bonds are formed holding the atoms together. The ratio of atoms in a compound is always a fixed, small, whole number, as per Dalton's atomic theory. Examples include water (H2O) and table salt (NaCl).
Explanation:Elements combine in different ways to produce compounds through a chemical reaction, which results in the formation of chemical bonds. For general reference, a compound is formed when two or more elements chemically combine, exhibiting definite chemical and physical properties distinct from its independent elements. Chemical bonds, namely ionic or covalent, hold the atoms together in a compound.
Take water as an example, it is a compound formed when two hydrogen atoms react with one oxygen atom, creating a molecule of water (H2O). In this compound, the ratio of hydrogen to oxygen atoms is 2:1, thus, presenting a clear demonstration of how elements combine in various ratios to create compounds with unique properties.
Another example can be the combination of sodium and chlorine to form table salt (NaCl). Here, one atom of sodium combines with one atom of chlorine. These examples manifest Dalton's atomic theory which elucidates that atoms of different elements can combine in fixed, small, whole-number ratios to form compounds.
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The way elements combine to produce compounds is best explained by chemical reactivity. Therefore, the correct answer is option a. chemical reactivity.
To understand which option best explains how elements combine in different ways to produce compounds, let’s look at each choice:
a. Chemical reactivity: This describes how readily an element reacts with other elements to form compounds, based on their electron configurations.b. State of matter: This refers to whether an element is a solid, liquid, or gas at room temperature, which does not directly affect how elements combine chemically.c. Similar physical properties: Elements with similar physical properties do not necessarily form compounds together.d. Matching atomic numbers: Atomic number defines an element and does not affect how different elements combine to form compounds.Therefore, chemical reactivity, best explains how elements combine in different ways to produce compounds. This is because elements combine based on their electron configurations and how their atoms interact to form stable molecules.
complete question.
Which best explains how elements combine in different ways to produce compounds?
a. chemical reactivity
b. state of matter
c. similar physical properties
d. matching atomic numbers
Copper crystallizes in a face centered cubic lattice. if the edge of the unit cell is 351 pm what is the radius of the copper atom
Final answer:
The atomic radius of a copper atom in a face-centered cubic lattice with an edge length of 351 pm is approximately 123.675 pm.
Explanation:
Calculating the Atomic Radius in a Face-Centered Cubic Lattice
For copper, which crystallizes in a face-centered cubic (FCC) lattice structure, we can calculate the atomic radius if we know the edge length of its unit cell. Given that the edge of the FCC unit cell is 351 pm, we can use the fact that the diagonal across the faces of the cube (√2 times the edge length) is equal to four times the atomic radius in an FCC lattice. This is because in an FCC structure, atoms touch along the face diagonal.
To calculate the atomic radius, we use the formula:
4r = √2 × edge length
Therefore: r = (√2 × 351 pm) / 4
r ≈ (1.414 × 351 pm) / 4
r ≈ 494.7 pm / 4
r ≈ 123.675 pm
The approximate radius of a copper atom in an FCC lattice is 123.675 pm.
How is stoichiometry used to calculate the amount of product from amount of reactant?
Stoichiometry relates moles of rectant to moles of product
How many ml of 0.112 M Pb(NO3)2 are needed to completely react with 10.0ml of a 0.105 M KI Given Pb(NO3)2 (aq) + 2KI(aq)=2KNO3(aq)?
Answer : The volume of [tex]Pb(NO_3)_2[/tex] needed are, 4.6875 ml
Explanation :
First we have to calculate the moles of [tex]KI[/tex].
[tex]\text{Moles of }KI=\text{Molarity of }KI\times \text{Volume of solution}=0.105mole/L\times 0.01L=0.00105mole[/tex]
Now we have to calculate the moles of [tex]Pb(NO_3)_2[/tex]
The given balanced chemical reaction is,
[tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow 2KNO_3(aq)+PbI_2[/tex]
From the balanced chemical reaction, we conclude that
As, 2 moles of KI react with 1 mole of [tex]Pb(NO_3)_2[/tex]
So, 0.00105 moles of KI react with [tex]\frac{0.00105}{2}=0.000525[/tex] mole of [tex]Pb(NO_3)_2[/tex]
Now we have to calculate the volume of [tex]Pb(NO_3)_2[/tex]
[tex]\text{Volume of }Pb(NO_3)_2=\frac{\text{Moles of }Pb(NO_3)_2}{\text{Molarity of }Pb(NO_3)_2}[/tex]
[tex]\text{Volume of }Pb(NO_3)_2=\frac{0.000525mole}{0.112mole/L}=4.6875\times 10^{-3}L=4.6875ml[/tex]
conversion used : (1 L = 1000 ml)
Therefore, the volume of [tex]Pb(NO_3)_2[/tex] needed are, 4.6875 ml
) how much of a 0.225 m kcl solution contains 55.8 g kcl?
Answer : The volume of solution is, 3.33 liter
Explanation : Given,
Mass of KCl = 55.8 g
Molar mass of KCl = 74.5 g/mole
Molarity = 0.225 M
Molarity : It is defined as the number of moles of solute present in one liter of solution.
In this question, the solute is KCl.
Formula used :
[tex]Molarity=\frac{w_b}{M_b\times V}[/tex]
where,
[tex]w_b[/tex] = mass of solute KCl
[tex]M_b[/tex] = molar mass of solute KCl
V = volume of solution = ?
Now put all the given values in the above formula, we get the molarity of the solution.
[tex]0.225mole/L=\frac{55.8g}{74.5g/mole\times V}[/tex]
[tex]V=3.33L[/tex]
Therefore, the volume of solution is, 3.33 liter
How much ammonia (nh3) is produced from two moles of nitrogen gas? 3h2 + n2 --> 2nh3?
What are the relative ion concentrations in an acid solution?
An Arrhenius base is a
substance that dissociates in water to form hydroxide ions (OH⁻).
For example lithium hydroxide is an Arrhenius base:
LiOH(aq) → Li⁺(aq) + OH⁻(aq).
Answer:
more H+ ions
Explanation:
Whats the point of love?
All animals want to survive. With this in mind, lets talk about some natural drugs that your body creates to create this feeling of "love".
P.E.A. is a natural anti-depressant that the body makes, kind of like dopamine. This is the most affiliated with the nickname "love drug". It creates the need to reproduce sexually. This is the primal instinct; to reproduce and pass on your genetic material.
Now, as you stay with one partner, you may find that the feeling changes a bit; this is P.E.A. turning into oxytocin. This is a deeper kind of love that humans develop once they have been with a partner for long enough. High levels of oxytocin are found when a mother has a child, usually found during breastfeeding.
There are many natural drugs that your body produces to create the feeling of love. If you have any questions, let me know! Hope this helps!
Why can you predict the base sequence of one strand in a molecule of DNA if you know the sequence of the other strand?
A-The order of bases in the two strands are identical.
B-There are only two base sequences, and a DNA molecule has each.
C-In DNA, each base pairs up with only one other base.
D-Every molecule of DNA has the same base sequence.
The sequence of bases on one strand of DNA can be predicted from the other due to specific base pairing rules, with adenine pairing with thymine, and cytosine with guanine, a principle foundational to DNA replication and repair mechanisms. Option c
The ability to predict the base sequence of one DNA strand when the sequence of the complementary strand is known is due to base pairing rules, which are critical for DNA replication and maintenance. In this specific pairing, adenine (A) always binds to thymine (T), and cytosine (C) always binds to guanine (G).
The bases on one strand form hydrogen bonds with the bases on the opposite strand, leading to a complementary base sequence: whenever there is an 'A' on one strand, there is a 'T' opposite it, and for every 'C' there is a 'G'. This strict pairing, which was elucidated in the Watson-Crick model of DNA, essentially allows one to recreate one strand's sequence from the other.
An example of complementary base pairing would be a DNA strand with the sequence 5'-AATTGGCC-3' having a complementary strand with the sequence 3'-TTAACCGG-5'..
Due to the nature of these interactions, the process of DNA replication involves separating the two strands and using each as a template to create a new complementary strand. This results in two DNA molecules where one strand is original and the other newly synthesized. The redundancy in information encoded by the complementary strands is a crucial aspect of genetic fidelity and repair mechanisms in the cell, ensuring the DNA's integrity over generations.
How many elements are in a compound that has a formula NiCI2+6H2O?
Which statement describes the difference between chemical reactions and nuclear decay
Chemical reactions can result in new compounds, while nuclear reactions can result in new elements.
In the Bronsted-Lowry model of acids and bases, a(n) _____ is a hydrogen donor and a(n) _____ is a hydrogen acceptor.
In the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.
What is Bronsted-Lowry acid and base?Bronsted-Lowry acid is any substance that donates a proton or hydrogen ion while a Brønsted-Lowry base is that which accepts an hydrogen ion.
Based on this definition, it can be said that a Brønsted-Lowry acid must possess hydrogen ion(s) to donate.
Examples of Brønsted-Lowry acid are as follows:
HClHCNH2SO4Therefore, in the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.
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Which of the following statements is not true of the process of nuclear fission? (3 points) It is the process used in most nuclear power plants. It only occurs in very small atoms with low mass. It involves the splitting of an atom's nucleus. It can occur in a chain reaction.
Ch of these three gases is most abundant in the atmosphere? which of these three gases is most abundant in the atmosphere? carbon dioxide (co2) nitrous oxide (n2o) methane (ch
Answer is Carbon dioxide.
The given gases are trace gases. Our atmosphere
has 0.1% of trace gases. Among those trace gases, carbon dioxide level is
highest as 93.49%. Methane has 0.44% and amount of nitrous oxide is 0.07%. But
when considering the whole atmosphere nitrogen gas is the most abundant gas as
78% and next is oxygen as 21%.
Carbon dioxide is the most abundant of the three gases mentioned in the Earth's atmosphere. Nitrogen and oxygen are the most abundant gases overall. Methane is more effective on a per-molecule basis at heating the atmosphere than carbon dioxide.
The question involves identifying which of the three gases carbon dioxide ([tex]CO_2[/tex]), nitrous oxide ([tex]N_2O[/tex]), or methane ([tex]CH_4[/tex]) is most abundant in the Earth's atmosphere. When considering these gases specifically, carbon dioxide is the most abundant. However, it is important to note that the major components of the atmosphere are nitrogen (78.1%) and oxygen (20.9%), with gases such as argon, carbon dioxide, neon, helium, methane, and nitrous oxide present in much smaller amounts.
Regarding the effectiveness at heating the atmosphere, methane is more effective on a per-molecule basis than carbon dioxide due to its ability to absorb more heat. However, carbon dioxide is more abundant and also contributes significantly to the atmospheric warming, playing a crucial role in the Earth's greenhouse effect beside water vapor, the most abundant greenhouse gas.
What mass of argon occupies 4.3 l at 70 kpa and 20 c?
To find the mass of argon gas at 4.3 liters, 70 kPa, and 20 °C, use the ideal gas law, convert units to atm and Kelvin, solve for moles, and then multiply by the molar mass of argon to obtain the mass, which is approximately 4.07 grams.
Explanation:The question asks for the mass of argon gas that occupies a volume of 4.3 liters at a pressure of 70 kPa and a temperature of 20 °C. To answer this, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we convert the given temperature to Kelvin:
Next, we need to convert the pressure from kPa to atm, since the ideal gas constant (R) is typically given in L·atm/(mol·K):
We can then rearrange the ideal gas law to solve for the number of moles (n):
Using the values and R = 0.0821 L·atm/(mol·K), we calculate n:
Finally, using the molar mass of argon, which is about 39.948 g/mol, we find the mass:
Therefore, the mass of argon that occupies a volume of 4.3 liters at 70 kPa and 20 °C is approximately 4.07 grams.