Grams are the unit of measurement of the mass or the weight of the substance. There are 1.17 gms of chlorine atoms in the sample.
What is mass?The mass of the substance is the multiplication of the moles and the molar mass.
Barium chloride dissociates as:
BaCl₂ ⇄ Ba²⁺ + 2 Cl⁻
From the reaction, it can be said that 1 mole of barium chloride dissociates into 1-mole barium ion and 2 moles of chloride ions.
Moles of barium chloride are calculated as:
Moles = mass ÷ molar mass
= 3.45 gm ÷ 208.23 g/mol
= 0.016 moles
If 1 mole of Barium chloride has 2 moles then 0.016 moles of the sample will have, 0.0331 moles of chloride ions.
The mass of chlorine atoms is calculated as:
Mass = moles × molar mass
= 0.0331 × 35.45
= 1.17 gms
Therefore, 1.17 gms of chlorine atoms are present in barium chloride.
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At 27.0 °C a gas has a pressure of 6.00 atm. What will the pressure be at 150.0 °C?
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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Which do you predict to have the greater electron affinity, Na or Na+ ? And why?
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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Milk in a bottle has a mass of 442grams and a volume of 425cubic centimeters. Calculate its density. Write your answer to the hundredths place. gramspercubic centimeter
Answer:1.04 grams per cubic centimeter
Explanation:
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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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
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 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.
Please help!!! Only one try. Explain why the answer is the right answer
Which equation is an example of artificial transmutation
Answer:Nitrogen can be transformed into oxygen by bombarding an alpha particle into the nucleus of nitrogen. An atom of hydrogen is produced as part of the transformation. Aluminum is transformed into phosphorous by combining the nucleus with an alpha particle
Explanation:
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
What changes in color occur when bromine reacts with an alkene?
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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Part B
What do radio waves carry?
Answer:
information from station to receiver
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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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:
most of the volume of an atom is occupied by ?
G. Empty space
Hope this helps!
water comes from different a.levels b.phases c.sources d.stages
Answer:
C. sources
Explanation:
What completely ionizes in solution
Answer:
Strong acids. hope this helps :)
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.
Which explanation describes the last part of a chemical reaction?
Reactants collide to form a transition state.
Transition state falls apart to form products.
Products collide to form reactants.
Reactants collide to form products.
I am not sure between Reactants collide to form a transition state and Transition state falls apart to form products. please put an explanation.
Answer:
Transition state falls apart to form products.
Explanation:
Reactants collide to form a transition state is actually the initial step (not the last step) because reactants have react with each other. Transition state is the middle stage, once this stage falls or passes, you get products. I have attached an example reaction scheme to better understand.
At 20°C, the volume of chlorine gas is
15dm3. Compute the resulting volume
if the temperature is adjusted to 318K
provided that the pressure remains
the same.
Given:
Unknown:
Formula:
Solution:
Final Answer:
Solving typed question by you
20°C=293KApply charles law
V1T2=V2T115(318)=293V2V2=16.27dm³Answer:
See below ~
Explanation:
Typed question
Given :
T₁ = 20 °C = 293 KV₁ = 15 dm³T₂ = 318 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂Solution :
15/293 = V₂/318V₂ = 318/293 x 15V₂ = 1.09 x 15V₂ = 16.35 dm³Final Answer :
16.35 dm³Question 3 (in attachment)
Given :
V₁ = 600 mLP₁ = 700 torrV₂ = 600(1 - 1/3) = 600(2/3) = 400 mLUnknown :
P₂Formula :
P₁V₁ = P₂V₂Solution :
700 x 600 = P₂ x 400P₂ = 600/400 x 700P₂ = 1.5 x 700P₂ = 1050 torrFinal Answer :
1050 torrHow do hydrogen ions exist in a solution?
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]
What environment will produce the largest crystal sizes?
Construct a short Essay (Make sure you include information about Temp, Pressure, amount of dissolved solids, & cooling time)
Is there support for your Claim?
Drink mix compound what is the formula for drink mix compound
Answer:
Is drinks a compound or mixture?
Drinks are usually solutions of various substances dissolved in the water. Since the amount of each of these can vary (sugar, flavoring, color, carbonation), it’s a mixture. The components can be separated by various physical methods such as evaporation. Is smoke a compound or a mixture? Smoke is a mixture.
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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What atoms have the most positive overall charge to least positive
overall charge.
Atom B: 24 protons, 18 electrons
Atom P: 7 protons, 10 electrons
Atom X: 104 protons, 102 electrons
Atom Q: 15 protons, 16 electrons
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.