Answer:
Mass of CaBr₂ = 179.9 g
Explanation:
Given data:
Volume of CaBr₂ solution = 450.0 mL (450/1000 = 0.45 L)
Molarity of solution = 2.00 M
Mass of CaBr₂ = ?
Solution:
Formula:
Molarity = number of moles / volume of solution in L
Now we will put the values.
2.00 M = number of moles / 0.45 L
Number of moles = 2 M × 0.45 L
Number of moles = 0.9 mol ( M = mol/L)
Mass of CaBr₂:
Mass of CaBr₂ = number of moles × molar mass
Mass of CaBr₂ = 0.9 mol × 199.89 g/mol
Mass of CaBr₂ = 179.9 g
To prepare 450 mL of a 2.00 M CaBr2 solution, one would need 180 grams of CaBr2, calculated using the molarity formula and the molar mass of CaBr2.
Explanation:To calculate the amount of CaBr2 needed to make a 2.00 M solution, we can use the formula: mass = molarity × volume × molar mass. The student wants a volume of 450 mL (0.450 L) of a 2.00 M CaBr2 solution. First, we need to find the molar mass of CaBr2 by adding the atomic masses of one calcium (Ca) atom and two bromine (Br) atoms. The atomic mass of Ca is approximately 40.08 g/mol, and the atomic mass of Br is approximately 79.90 g/mol. So, the molar mass of CaBr2 is 40.08 g/mol + (2 × 79.90 g/mol) = 199.88 g/mol.
Using the formula we have: mass = 2.00 M × 0.450 L × 199.88 g/mol = 179.892 g. Rounding off, we need 180 grams of CaBr2 to create 450 mL of a 2.00 M solution.
a gas is at a pressure of 12.5psi and a volume of 750mL. What volume will the gas occupy at a pressure of 18psi?
Answer:
520.8 mL
Explanation:
We can solve this problem by using Boyle's Law, which states that:
"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"
Mathematically:
[tex]p\propto \frac{1}{V}[/tex]
where
p is the pressure
V is the volume
We can rewrite the equation as
[tex]p_1 V_1 = p_2 V_2[/tex]
where here:
[tex]p_1=12.5 psi[/tex] is the initial pressure of the gas
[tex]V_1=750 mL[/tex] is the initial volume
[tex]p_2=18 psi[/tex] is the final pressure
And solving for V2, we find the final volume of the gas:
[tex]V_2=\frac{p_1 V_1}{p_2}=\frac{(12.5)(750)}{18}=520.8 mL[/tex]
Have heat waves ever affected the world in a way? Explain.
Answer: Yes, they have.
Explanation: The frequency, severity, and length of heat waves are increasing. Heat and humidity already kill an average of 1,300 people in the U.S. each year. Deadly heat waves of at least 20 days affect 30% of the earth's population. That will increase to 75% by 2100 if global warming isn't stopped.
An atom is said to be in an excited state when it possesses more energy than when it is in its
ground state.
True or false?
Answer:
True!
Explanation:
what type of reaction is sodium reacting with chlorine
Answer:
combination reaction
Explanation:
i'm not sure i just searched it on the internet
Answer:
Combination reaction
Explanation:
When sodium reacts with chlorine
It is known to be combination reaction because they will combine to give a specific compound
That is,Na+Cl=NaCl
And the bond formed between them is ionic bond
Which of the following describes the stage that occurs after evaporation in the water cycle?
A.
precipitation
B.
radiation
C.
condensation
D.
respiration
In the water cycle, the stage following evaporation is condensation. This process involves water transforming from a gas back into a liquid form in the atmosphere, eventually leading to precipitation.
Explanation:In the water cycle, the stage that occurs after evaporation is condensation. After water evaporates from the earth's surface, it rises into the atmosphere where cooling temperatures cause it to change from a gas (steam) back into a liquid form, creating clouds.
This is the process of condensation. It's important to note that the water cycle is a continual process, and after condensation, the cycle usually moves on to precipitation, where the condensed water falls back to the earth as rain, sleet, or snow.
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Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space.
(This is for a USA TEST PREP)
In the Venn Diagram:
- "DNA replicates" goes under "Cell divides once".
- "4 Daughter cells" is placed under "Cell divides twice".
- "Growth and repair" can be in the overlap of "Asexual Reproduction" and "Both Sexual Reproduction".
In the Venn Diagram:
- "DNA replicates" would go under the category "Cell divides once" as DNA replication typically occurs before cell division.
- "4 Daughter cells" would be placed under the category "Cell divides twice" as it indicates a cell division process resulting in four daughter cells.
- "Growth and repair" can be placed in the overlapping space of "Asexual Reproduction" and "Both Sexual Reproduction" as both types of reproduction involve growth and repair processes.
The probable question maybe:
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space. ITEMBANK: Move to Bottom 2 Daughter cells DNA replicates 4 Daughter cells Cell divides once Cell divides twice Growth and repair Asexual Reproduction Both Sexual Reproduction drag and drop answer here drag and drop answer here drag and drop answer here
What is [H30+] in a solution with a pH of 10.4?
Answer:
(H30+) = 3,98 x10 ^-11 M
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
We solve (H30+) and calculate:
(H30+) = antilog - pH
(H30+) = antilog - 10.4
(H30+) = 3,98 x10 ^-11 M
At dinner your brother got mad and threw your burrito at a speed of 4 m/s. It flies for 18 seconds trough the air. How much distance did the burrito cover?
Answer:
Distance = 72 meters.
Explanation:
Given data:
speed of burrito = 4 meter/ second
Time taken in flight = 18 seconds.
Required: The distance covered during this time and having the above speed by the burrito.
Solution :
Formula of speed is given below.
Speed = distance / time interval
By putting the values of speed and time, we get,
4 meter / second = distance / 18 seconds.
Multiply 18 both, we get
4 x 18 = distance
Distance = 72 meters.
DNA damage can also occur in the form of broken bonds as in the sugar-phosphate backbone of DNA. This type of DNA damage can cause deletion mutations if pieces of DNA break away from the molecule. When those pieces rejoin a different molecule of DNA, what type of mutation has occurred?
A)Messenger Mutation
B)Mechanical Mutation
C)Translocation Mutation
D)Relocation Mutation
Answer:
A
Explanation:
Which reactant will be in excess, and how many moles of it will be left over?
Answer:
Oxygen and 0.36
Explanation:
Oxygen is usually always in excess and you use the math to find the 0.36
What is the volume, to the nearest whole cubic inch, of a cylinder with a height of 10 inches and a radius of 8 inches? Use Pi = 3.14 and round your answer to the whole number.
cubic inches
Answer:
v=2010 inches^3
Explanation:
The volume of a cylinder can be found using:
[tex]v=\pi r^2h[/tex]
We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi
v=3.14(8^2)(10)
Solve the exponent first
v=3.14(64)(10)
v=3.14(640)
v=2009.6
To the nearest whole number:
v=2010 inches^3
What size volumetric flask would you use to create 1.50 M
solution using 43.85 g of NaCl?
The size of volumetric flask is 0.5L = 500mL
Explanation:
In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.
Molarity of a solution is given by;
[tex]M= \frac{n}{V}[/tex]
Where;
n= number of moles of solute
V= volume of solution = size of volumetric flask
[tex]n=\frac{m }{ m.m}[/tex]
Where;
m= mass of solute=43.85g
m.m= molar mass of solute=58.5g
Note that solute is NaCl(s)
[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]
We know that the molarity is 1.50M
To find the size of the volumetric flask, we make V in M=n/V subject of formula
[tex]V=\frac{n}{M}[/tex]
[tex]V=\frac{0.75}{1.50}[/tex]
[tex]V=0.5[/tex]
Therefore, the size of volumetric flask is 0.5L = 500mL.
Final answer:
To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.
Explanation:
To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:
moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles
Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:
1.50 M = 0.750 moles / V (liters)
Solving for V gives us:
V = 0.750 moles / 1.50 M = 0.500 liters
Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.
Which statement is true?
In an exothermic reaction, the energy of the products is the same as the energy of the reactants.
In an endothermic reaction, the energy of the products is less than the energy of the reactants.
In an exothermic reaction, the energy of the products is less than the energy of the reactants.
In an endothermic reaction, the energy of the products is the same as the energy of the reactants.
Answer:
C
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Answer:
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Consider the following three-step reaction pathway.
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast)
Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow)
Step 3: (CH3)Au + PH3 – (CH3)AuPH3 (fast)
Which is the correct list of reaction intermediates from the reaction pathway above?
A.) (CH3)3AuPH3, (CH3)3Au, and (CH3)Au
B.) PH3 and (CH3)Au
C.) (CH3)3AUPH3 and C2H6
D.) PH3, (CH3)3Au, and (CH3)Au
Final answer:
The correct list of reaction intermediates is A)(CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
Explanation:
The correct list of reaction intermediates from the given reaction pathway is:
A)(CH3)3AuPH3
,
(CH3)3Au
, and
(CH3)Au
This can be determined by examining the steps of the reaction pathway. In step 1, (CH3)3AUPH3 is converted into (CH3)3Au and PH3. In step 2, (CH3)3Au reacts to form (CH3)Au and C2H6. Finally, in step 3, (CH3)Au reacts with PH3 to form (CH3)AuPH3. Therefore, the intermediates are (CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
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In the provided chemical reaction pathway, the intermediates are (CH3)3Au and (CH3)Au as they are produced in a step and consumed in a later step. This makes option D correct.
Explanation:In a chemical reaction, intermediates are substances that form during the reaction but are consumed before it's completed. Here, judging from the three-step reaction pathway you've been provided:
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast) Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow) Step 3: (CH3)Au + PH3 → (CH3)AuPH3 (fast)
The intermediates can be identified as the molecules that are produced in one step and consumed in a later step. Based on this, the correct list of reaction intermediates from this reaction pathway is (CH3)3Au, because it is produced in step 1 and consumed in step 2 and (CH3)Au, because it is produced in step 2 and consumed in step 3. So, option D.) PH3, (CH3)3Au, and (CH3)Au is correct.
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How many joules (J) are needed to increase the temperature of 10.0 g of lead (Pb) from 30 ˚C to 50 ˚C? (Cp for Pb = 0.128 J/g˚C)
25.6 J
38.4 J
64.0 J
102.4 J
Answer:
Q = 25.6 j
Explanation:
Given data:
Energy needed= ?
Mass of lead = 10.0 g
Initial temperature = 30 °C
Final temperature = 50°C
Cp = 0.128 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 30°C
ΔT = 20°C
Now we will put the values in formula.
Q = 10 g × 0.128 j/g.°C × 20°C
Q = 25.6 j
At 60 Celsius , 123 grams of NaNO3 is dissolved in 100 grams of water. What is the Molarity of this solution?
Answer:
CHAPTER 17
PROPERTIES OF SOLUTIONS
Solution Composition
12. Mass percent: the percent by mass of the solute in the solution.
Mole fraction: the ratio of the number of moles of a given component to the total number of
moles of solution.
Molarity: the number of moles of solute per liter of solution.
Molality: the number of moles of solute per kilogram of solvent.
Volume is temperature-dependent, whereas mass and the number of moles are not. Only
molarity has a volume term, so only molarity is temperature-dependent.
13. a. HNO3(l) → H+
(aq) + NO3
−
(aq) b. Na2SO4(s) → 2 Na+
(aq) + SO4
2−
(aq)
c. Al(NO3)3(s) → Al3+(aq) + 3 NO3
−
(aq) d. SrBr2(s) → Sr2+(aq) + 2 Br−
(aq)
e. KClO4(s) → K+
(aq) + ClO4
−
(aq) f. NH4Br(s) → NH4
+
(aq) + Br−
(aq)
g. NH4NO3(s) → NH4
+
(aq) + NO3
−
(aq) h. CuSO4(s) → Cu2+(aq) + SO4
2−
(aq)
i. NaOH(s) → Na+
(aq) + OH−
(aq)
14. Mol Na2CO3 = 0.0700 L ×
L
3.0 mol Na 2CO3 = 0.21 mol Na2CO3
Na2CO3(s) → 2 Na+
(aq) + CO3
2−
(aq); mol Na+
= 2(0.21) = 0.42 mol
Mol NaHCO3 = 0.0300 L ×
L
1.0 mol NaHCO3 = 0.030 mol NaHCO3
NaHCO3(s) → Na+
(aq) + HCO3
−
Which of these is a problem with using nuclear energy?
A.
It is very expensive to use.
B.
It is a non-renewable energy source.
C.
There aren't enough qualified technicians.
D.
We don't have a way to contain the radioactive waste produced.
Answer:
I think the answer is B
Explanation:
Nuclear energy is usually considered a non-renewable energy source. Although uranium is found in rocks all over the world, nuclear power plants usually use a very rare type of uranium, U-235. Uranium is a non-renewable resource.
What is the mass of 1.72 moles of BaSO4?
Answer: 401.4g
Explanation:
The mass can be calculated by using the following mathematical expression for Moles ,which is:
Moles = Mass / Molar Mass
From the question given, Moles = 1.72, Molar mass of BaSO4 = 233.38g/mol, Mass =?
Making 'Mass' the subject of formula, we get:
Mass = Molar mass x Moles
= 233.38 x 1.72 = 401.4g
How many representative particles are in 1.45 g of a molecular compound with a molar mass of 237 g?
Answer:
3.683×10^21 particles
Explanation:
Number of particles in a substance = (mass of the substance/molar mass of the substance)×Avogadro's number
Given;
Mass of compound =1.45g
Molar mass of compound =237g
Avogadro's number=6.02×10^23
Therefore, number of particles = (1.45/237)×6.02×10^23
=3.683×10^21 particles
Answer:
3.68•10^21 particles (correct to 3SF)
Explanation:
1.45 • xg molecular compound • 1mol/237g • (6.02•10^23)/ 1 mol = 3.6831•10^21 representative particles
*6.02•10^23 is Avagadro's number
Select all the correct images.
Select the atomic models that belong to the same element.
.
Answer:
There is no image
Explanation:
What is the pOH of the solution?
The pOH of the solution is 8.
What is pOH?
pOH is a measure of the hydroxide ion concentration in a solution, reflecting its alkalinity. It is calculated as the negative logarithm of the hydroxide ion concentration. The pOH scale complements the pH scale, which measures the hydrogen ion concentration, and together they provide a comprehensive view of a solution's acid-base balance.
We know that;
pOH = - log[OH-]
pOH = -log[9.5 *[tex]10^{-9[/tex]]
pOH = 8
how many grams of calcium fluoride contain 38 grams of fluoride atoms
The volume of any gas is dependent on what three variables? *
The volume of a gas is dependent on:
1. Pressure
2. Temperature
3. Amount of gas.
Lakes can disappear due to _
A. Condensation
B. Transpiration
C. Eutrophication
D. Photosynthesis
Answer:
i think it's eutrophication
Lakes can disappear due to Eutrophication, which is a biological process where a buildup of nutrients causes rapid plant growth. When these plants die and decompose, the oxygen in the water is consumed, leading to the disappearance of the lake over time.
Explanation:Lakes can disappear due to various natural phenomena, but particularly due to Eutrophication. This is a biological process, where a buildup of nutrients can cause rapid plant growth, particularly algae, in the lake. As these plants die and decompose, bacteria thrive and consume oxygen in the water, thereby making it uninhabitable for aquatic life. Continued eutrophication can eventually lead to a lake losing its water and becoming a marsh or dry land.
Condensation, Transpiration, and Photosynthesis do not directly contribute to the disappearance of lakes, as these processes are part of the water cycle and the energy balance in ecosystems, respectively.
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if a banana is a fruit what type of tree does it come out of?
Answer:
I don't know what?
Explanation:
Answer:
They don’t grow from a tree
Explanation:
They grow from a root system that produces an a over ground structure resembling a stalk
the banana tree is technically an herbaceous plant
Increasing the mass of an object will... *
Answer:
Increasing the mass of an object will decrease the acceleration, because of Newton's Second Law (the acceleration of an object increases with increased force, decreases with increased mass, and moves the same direction as the force).
A magnet moved near a coil of wire can cause a(n)
to flow.
A. electric current
B.protons
c. magnetic field
D.neutrons
Answer:
A magnet moved near a coil of wire can cause a(n) electric current to flow. (The magnet's magnetic field also moves.)
Explanation:
The answer is A.
10 POINT
I WILL MARK BRANLIEST PLSS HELP
Plants have played a role in affecting the Earth system by:
I. changing the composition of the atmosphere
II. changing the quality of the soil
III. weathering rocks
IV. altering the length of a day
A.
II and IV only
B.
I, II, and III only
C.
III and IV only
D.
I only
While waiting for your car to warm up one winter morning, you notice a liquid dripping from your tailpipe. You recently
learned in chemistry class that combustion reactions occur in car engines. The liquid dripping from your tailpipe is, therefore,
a product of this combustion.
What is the identity of the liquid?
A)
Methanol
B)
Octane
Propane
Water
Answer:
A
Explanation:
Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.
Now molecules: molecules of H2 + molecules of O2 → molecules of H2O
Answer:
Now molecules:
(2) molecules of H 2 + (1) molecules of O 2 → (2) molecules of H 2 O
Explanation:
i just got the answer correct
The question involves a basic chemical reaction in Chemistry. Two molecules of hydrogen and one molecule of oxygen combine to form two molecules of water. It shows the process of a balanced chemical equation.
Explanation:The question provided involves a basic chemical reaction, in which hydrogen (H2) and oxygen (O2) molecules combine to create water (H2O). This process is an example of a balanced chemical reaction, in accordance with the law of conservation of matter that requires the total number of atoms for each element to remain the same before and after a reaction. Essentially, 2 molecules of hydrogen (H2) and 1 molecule of oxygen (O2) will combine to form 2 molecules of water (H2O)
This can be represented as: 2H2 + O2 → 2H2O. This means, two hydrogen molecules (each containing 2 hydrogen atoms) react with one molecule of oxygen (containing 2 oxygen atoms) to form two molecules of water (each containing 2 hydrogen atoms and 1 oxygen atom).
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