Answer: Compounds are composed of molecules bonded together.
The statement about compounds and molecules is correct is compounds are composed of molecules bonded together. Therefore, option C is correct.
What are compound ?The term compound is defined as a substance made from two or more different elements that have been chemically attached. Water, carbon dioxide and table salt are some examples of compounds.
A compound is form when two or more atoms form a chemical bond that links them together. As we know, there are two types of bonds are present that are ionic bonds and covalent bonds.
In an ionic bond, the atoms are linked together by the electrostatic forces of the attraction between ions of opposite charge. So,compounds are composed of molecules bonded together.
Thus, option C is correct.
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How many molecules of hydrogen fluoride (HF) are in (8.5x10^-2) moles of hydrogen fluoride (HF)?
Molecules and the moles can be interconverted into each other with the help of the Avogadro's number. In 8.5 x 10⁻² moles of hydrogen fluoride, there are 51.17 × 10²¹ molecules.
What is Avogadro's number?Avogadro's number is the special number that converts the moles into molecules and vice versa. The value of the Avogadro's number is 6.02 x 10²³.
If 1 mole of HF has 6.02 x 10²³ molecules then,
8.5 x 10⁻² moles of HF will have:
(8.5 x 10⁻²) × 6.02 x 10²³) = 51.17 × 10²¹
Therefore, 51.17 × 10²¹ molecules are present in HF.
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C + 2H2 -> CH4
For the reaction shown here, predict the number of moles of hydrogen gas needed produce 32 grams of methane.
A) 1
B) 2
C) 4
D) 8
Answer:
C) 4
Explanation:
The reaction :
C (s) + 2H₂ (g) ⇒ CH₄ (g)12g 4g 16g
Hence, based on this we can say that : 2 moles of hydrogen gas are needed to produce 16g of methane.
For 32g of methane
Number of moles of H₂ = 32/16 × 2Number of moles of H₂ = 4According to the stoichiometry, 8 moles of hydrogen gas are needd to produce 32 g of methane.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is a quantitative study of reactants and products. Stoichiometric conversions make use of mass and moles.In the given example and according to the chemical reaction given,as 4 moles of hydrogen produce 16 g methane,∴for 32 g methane, 32×4/16=8 moles.
Thus , 8 moles of hydrogen gas are required to produce 32 g of
methane.
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Part B
What do radio waves carry?
Answer:
information from station to receiver
Which of the following represents the quantity of heat required to raise the temperature of one gram of a substance by one degree Celsius?
A) Heat of reaction
B) Boiling point
C) Specific heat capacity
D) Thermochemical value
Answer:
C
Explanation:
The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree. The Scottish scientist Joseph Black, in the 18th century, noticed that equal masses of different substances needed different amounts of heat to raise them through the same temperature interval, and, from this observation, he founded the concept of specific heat. In the early 19th century the French physicists Pierre-Louis Dulong and Alexis-Thérèse Petit demonstrated that measurements of specific heats of substances allow calculation of their atomic weights (see Dulong-Petit law). See also heat capacity.
The statement that represents the quantity of heat required to raise the temperature of one gram of a substance by one degree Celsius is Specific heat capacity. The correct option is C.
What is Specific heat capacity?
When the temperature of a material rises 1 K (or 1 °C), the amount of heat (J) is absorbed per unit mass (kg). It is crucial since it will show how much energy will be needed to warm or cool an object of a certain mass by a certain amount.
The formula of specific heat capacity is [tex]Q=mc\Delta T[/tex] Where q is the specific heat, m is the mass and t is the change in temperature.
According to the definition, a material's specific heat capacity is normally calculated by calculating the heat capacity of an illustration of the substance, commonly using a calorimeter, and dividing by the sample's mass.
Thus, the correct option is C. Specific heat capacity.
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Calculating the Equilibrium Solubility Constant
A specific metal ion, M²+, forms a relatively insoluble sulfide compound, MS, which dissolves to a very limited extent.
MS(s) = M²+ (aq) + S²-(aq)
The concentration of ions in a saturated solution was found:
[M²+ (aq)] = [S2-(aq)] = 0.000143 mol L-¹.
Calculate Ksp for the compound MS.
Give three significant figures.
Enter your answer in exponential form, for example, enter 0.000000672 as 6.72e-7 with no gaps and the -ve e if power
is -ve.
The solubility product of the substance MS in water is 2.0 * 10^-8.
What is solubility product?The solubility product is an equilibrium constant that shows the extent to which a solid is dissolved in water.
In this case, the equilibrium is; MS(s) = M²+ (aq) + S²-(aq) but M²+ (aq)] = S^2-(aq)] = 0.000143 mol L-¹.
Thus
Ksp = [0.000143 ]^2 = 2.0 * 10^-8
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The drawing shows a chemical reaction between hydroxide and bromomethane to produce methanol and bromide ion. The middle drawing is the activated complex. The reaction is exothermic.
Which species has the lowest energy?
A
B
C
Item 4
Item 4
Answer:
C.
Explanation:
Exothermic means the energy of products is lower than energy of reactants. Transition state will always be the highest energy among the two.
If 22.5L of nitrogen at 0.98 atm is compressed to 0.95 atm,what is the new volume?
At constant temperature, if the pressure is compressed to the given value, the volume of the nitrogen gas increases to 23.2L.
What is Boyle's law?Boyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given that;
Initial volume of the gas V₁ = 22.5LInitial pressure of the gas P₁ = 0.98atmFinal pressure of the gas P₂ = 0.95atmFinal volume of the gas V₂ = ?P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
V₂ = (0.98atm × 22.5L) / 0.95atm
V₂ = 22.05Latm / 0.95atm
V₂ = 23.2L
Therefore, at constant temperature, if the pressure is compressed to the given value, the volume of the nitrogen gas increases to 23.2L.
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When writing a net ionic equation the sum of the charges for reactants is greater than the sum of charges for products
Please select the best answer from the choices provided
OT
OF
Answer:
Explanation:
Net ionic equations must be balanced by both mass and charge. Balancing by mass means ensuring that there are equal masses of each element on the product and reactant sides. Balancing by charge means making sure that the overall charge is the same on both sides of the equation.
Question 29 of 30
The thermochemical equation for the reaction of pentane and oxygen is
shown below. What does the equation tell you about the reaction?
C,H,(g)+80,(g) → 500,(g) + 6H2O(g) + 3536 kJ
O A. It is endothermic.
B. It has a low activation energy.
C. It has a high activation energy.
D. It is exothermic.
what are three classes of levers? (science)
The three classes of lever include first, second and third class lever.
What are levers?Levers are simple type of machine that are used to transfer the force used to lift a load.
Examples of lever include the following:
First class lever: This is the type of lever where the fulcrum is between the load and the effort.Second class lever: This is the type of lever that has the load between the fulcrum and effort.Third class lever: This is the type of lever that has the effort between the fulcrum and the load.Therefore, the three classes of lever include first, second and third class lever.
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solubility constant 5
For the dissolving of CaF2, the equilibrium constant expression, Ksp, is
Select one:
O Ksp = [Ca2+] [F]²
Ksp = [Ca2+] [F] / [CaF₂]
O Ksp = [Ca²+] [F]
O
Ksp = [Ca2+] [F]²/[CaF₂]
O
Ksp = [CaF₂] / ([Ca²+] [F] ²)
The Ksp of the compound CaF2 is given as; Ksp = [Ca2+] [F]²
What is solubility product?The term solubility product has to do with the extent to which a substance dissolves in solution.
For the compound CaF2, we have; CaF2(s) ⇆Ca^2+(aq) + 2F^-(aq). Hence, the Ksp of the solution is Ksp = [Ca2+] [F]²
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Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?
Rainforest
Swamp
Tundra
Wetland
Answer:
is D :)
Explanation:
At 27.0 °C a gas has a pressure of 6.00 atm. What will the pressure be at 150.0 °C?
Imagine you are in Spain and begin cooking some pasta for your dinner.
You notice the recipe reads "Bring water to a boil at 100 C". What is the
temperature of your water in Kelvin?
Ο OK
100 K
273 K
373 K
How much heat does it take to warm 16.0 g of pure water from 90.0 degree C to 100.0 degree C?
The specific heat of water = 4.18 J/g. degree C
16.0 Joules
160 Joules
66.9 Joules
669 Joule
[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
669 J
Right option is D.
Step by Step Explanation:
[tex] \sf Mass \: of \: water(m) = 16g \\ \\ \sf Specific \: heat \: of water(C) = 4.18J/g \\ \\ \sf Change \: in \: temperature ( \triangle T) = 100 - 90 = 10{ \degree}C[/tex]
[tex] \sf \large \red{ Heat = mC\triangle T}[/tex]Now substituting the required values.
[tex] \sf \hookrightarrow Heat = 16 \times 4.18 \times 10 \\ \\ \sf \hookrightarrow Heat = 668.8(approx) \\ \\ \blue {\boxed { \hookrightarrow{Heat = 669J }}}[/tex]
How many molecules ?
Answer:
42 millions of single cells
most of the volume of an atom is occupied by ?
G. Empty space
Hope this helps!
A state government is trying to decide between using biomass or nuclear power to generate electricity. What advantage does biomass have over nuclear power?
0
A. Biomass does not produce pollution
0
B. Biomass releases less carbon dioxide.
0
C. Biomass is a nonrenewable source.
A
D. Biomass produces no radioactive waste
Answer:
D Biomass produces no radioactive waste
Explanation:
Besides drinking water, how is water helpful for life and nature?
Answer:
The composition of a water molecule is one of the first chemical compounds we learn—H2O—two hydrogen atoms and one oxygen atom. The atoms connect in a slightly offset or triangular structure, which creates a positive charge on one side of the molecule and a negative charge on the other.
Explanation:
Water is essential to life—we learn this early in our elementary school years. This information is often accompanied by the fact that over 50% of our bodies are made up of water. However, the lesson does not always go on to explain what it is about water that makes it so essential.
(Hope this was helpful!)
The substance being dissolved
A) Solute
B) Solubility
C) Solvent
Answer:
A) Solute
Explanation:
In forming a solution, the substance which is dissolved by the action of the solvent is called solute.
1. Calculate the molar mass of sucrose (C12 H11 O22)?
Answer:
=342g
Explanation:
atomic mass of C = 12g
atomic mass of H = 1g
atomic mass of O = 16g
Solution;
C12 H22 O11
= 12 (12) + 22 (1) + 11(16)
= 144+ 22 + 176
= 342g
An alpha particle is made up of
O one proton and one neutron
Otwo protons and two neutrons
Oone electron
Otwo electrons
Answer: two protons and two neutrons
Explanation:
An alpha particle is just a helium-4 isotope, which obviously has 2 protons and 2 neutrons.
A process in which a large nucleus splits into two or more parts is called ?
(A) nuclear fission
An alpha particle is made up of _____.
(C) two protons and two neutrons
Which statement best describes the type of radioactive decay shown in the model?
(D) The model shows alpha decay, which is a type of nuclear fission.
Is beta decay a form of nuclear fission?
Responses
(A) No, it is not because the mass number does not change.
Which statement correctly classifies gamma emission?
(D) Gamma emission is a type of radioactive decay, but it is not a fission reaction.
Explanation:i just did the quick check, hope this helps UwU
Most enzymes work best at 37C because at lower and higher temperatures, the conditions are not optimal for their performance. Explain in DETAIL what happens at low temperatures, optimal temperature and high temperatures with the molecular speed, energy and interactions. Be sure to explain what denaturation means.
That's because the solubility
Temperature is directly proportional to solubilityHigher the solubility higher the temperature
Lower the temperature lower the solubility
So
Less temperature makes enzymes work faster
What changes in color occur when bromine reacts with an alkene?
Besides drinking water, how is water helpful for life and nature?
Answer:
It keeps us alive, helps us grow plants, helps plants thrive, gives us food, helps keep our animals and crops healthy, cleans us, and so much more
Explanation:
How do hydrogen ions exist in a solution?
The concentration of an unknown protein sample was determined as 8.3 mg/ml. Calculate the concentration of the unknown protein in mM (millimolar) if: Average molecular mass of an amino acid = 118 g/mol The protein is 64 amino acids in length.
Based on the molar mass of the protein, the concentration of the unknown protein is 0.0011 mM (millimolar).
What is concentration?Concentration is the amount of a solute present in a given volume of substance.
Concentration = moles/volumeMoles of protein = mass/molar mass
molar mass of protein = 118 × 64 = 7552 g/mol
Moles of protein in 8.3 g = 8.3/7552 = 0.0011 moles
Concentration = 0.0011 mole/mL = 0.0011 mM.
Therefore, the concentration of the unknown protein is 0.0011 mM (millimolar).
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How Is Your Mind Related to Your Body
Answer:
The brain and body are connected through neural pathways made up of neurotransmitters, hormones and chemicals. These pathways transmit signals between the body and the brain to control our everyday functions, from breathing, digestion and pain sensations to movement, thinking and feeling.
1) Students are interested in quickly completing their lab experiment before going to lunch. What are 4
ways to increase the reaction rate below?
Zn() + 2HCl(aq)
Hz(s) + ZnCl2(g) + heat
The reaction rate can be increased by increasing the temperature, increasing the concentration of reactants, using catalysts, or increasing the surface area of the reactants.
Factors affecting rates of reactionsThe factors affecting the rate of reactions include:
Temperatureconcentration of reactantsAddition of catalystsSurface area of reactantsEach factor affects the rate of reaction as follows:
Increased temperature increases the rate of reactionIncreasing the concentration of reactants increases the rate of reactionAdding catalysts increases the rate of reactionsIncreasing the surface area of reactants increases the rate of reactions.More on factors affecting rates of reactions can be found here: https://brainly.com/question/14817541
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11. How many molecules of oxygen will be consumed when 33.6 liters of water is produced?
Answer:
67.2 litres of oxygen will be consumed
Explanation:
Step 1 : Write the balanced chemical equation:
2H₂ + O₂ → 2H₂O
Step 2: find the ratio of O₂ : H₂O
O₂ : H₂O
1 : 2
67.2 : 33.6
Thus, 67.2 litres of oxygen will be consumed