Answer:
[tex]\Delta T=1.53\°C[/tex]
Explanation:
Hello!
In this case, since the problem is providing mass, energy, and specific heat of water, we can write the following equation that relates them to each other:
[tex]Q=mC\Delta T[/tex]
In such a way, we get rid of both m and C, to solve for the change in temperature:
[tex]\Delta T=\frac{Q}{mC}[/tex]
Now we plug in the data to obtain:
[tex]\Delta T=\frac{1238J}{194.0g*4.184\frac{J}{g\°C} }\\\\\Delta T=1.53\°C[/tex]
Best regards!
If you have 312 grams of calcium chloride, how many atoms would you have?
1.69 × 10²⁴ atoms CaCl₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableWriting CompoundsAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Use Dimensional AnalysisExplanation:Step 1: Define
312 g CaCl₂ (calcium chloride)
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ca - 40.08 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of CaCl₂ - 40.08 + 2(35.45) = 110.98 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 312 \ g \ CaCl_2(\frac{1 \ mol \ CaCl_2}{110.98 \ g \ CaCl_2})(\frac{6.022 \cdot 10^{23} \ atoms \ CaCl_2}{1 \ mol \ CaCl_2})[/tex]Divide/Multiply: [tex]\displaystyle 1.69298 \cdot 10^{24} \ atoms \ CaCl_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.69298 × 10²⁴ atoms CaCl₂ ≈ 1.69 × 10²⁴ atoms CaCl₂
NEED HELP FAST!!!!!!!!!!!!
Are these sentences true or false? Tick the boxes
True False
a) The substance is an element.
b) The substance contains five atoms.
c) There is carbon in the substance.
d) The substance contains nitrogen and hydrogen.
Explain how the valence electrons are related to the element's period.
Answer:
The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next
what is this balanced?
Al2O3---> Al+O2
The balanced equation :
2Al₂O₃⇒ 4Al+3O₂
Further explanationGiven
Reaction
Al₂O₃⇒ Al+O₂
Required
Balanced equation
Solution
A chemical reaction is said to be balanced if the number of elements involved in the reaction is the same (either the reactants or the products)
The reaction above is said to be unbalanced because the number of elements Al and O in the reactants and products is not the same.
The balancing step
1. Give a coefficient
Al₂O₃⇒ aAl+bO₂
2. Make an equation
Al, left = 2, right = a⇒a=2
O, left = 3, right = 2b⇒2b=3⇒b=3/2
The equation becomes :
Al₂O₃⇒ 2Al+3/2O₂ x2
2Al₂O₃⇒ 4Al+3O₂
Select the correct answer.
Which of the following does the Sun orbit?
A.
The center of the Milky Way
B.
The Earth
C.
The Moon
D.
The stars
Arteries do not contain muscle of any type.
True or False?
False.
Arteries are said to be more muscular.
That means Arteries ARE* MUSCLES
A sample of 254.2 grams of copper completely reacted with oxygen to form 286.2 grams of copper oxide product how many grams of oxygen reacted
During a chemical reaction nb of atoms and mass is always conserved , so mass of Reactants is equal mass of Products.
which of the following is the best characterization of the nature of light?
Answer: Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference
Explanation:
Answer:
Light energy
Explanation:
What type of reaction has only one reactant
Answer:
composition reaction has only one reactant
I hope it helps you
How many moles of Na are in 42 g of Na?
Question 4
How many moles are contained in 67 L of CO2 gas at STP? Round your answer to three significant figures and include units.
Answer:
2.99 mol
Explanation:
Number of moles of CO₂ = ?
Volume = 67 L
Temperature and pressure = standard
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
By putting values,
1 atm × 67 L = n ×0.0821 atm.L/ mol.K × 273.15 K
67 atm.L = n×22.43 atm.L/ mol
n = 67 atm.L/22.43 atm.L/ mol
n = 2.99 mol
Given 2AL + 6HCL → 2ALCL3 + 3H2, how many grams of aluminum do I need to produce 11 L of hydrogen gas at STP?
Mass of Aluminum= 8.829 g
Further explanationGiven
Reaction
2Al + 6HCl → 2AlCl₃ + 3H₂
Required
mass of Aluminum
Solution
At STP, 1 mol gas = 22.4 L
For 11 L of Hydrogen :
= 11 : 22.4
= 0.491
From equation, mol ratio Al : H₂ = 2 : 3, so mol Al :
= 2/3 x mol H₂
= 2/3 x 0.491
= 0.327
Mass Aluminum(Ar=27 g/mol) :
= 0.327 mol x 27 g/mol
= 8.829 g
3. Do objects of different masses fall at different rates? Why or why not? *
Answer:
yes.it depends on acceleration due to gravity,weight .
When sodium is dissolved in water, why is it that the water molecules orient themselves such that their oxygen atoms are facing the sodium? Be specific.
Answer: water molecules are polar and Os are slightly negative. Na loses its electron to the nearest H and so is positive. The overall reaction is that the single electron of Na attaches to a H, breaking the bond with O. This leaves Na+ and the OH- ions in solution, while the H atoms form H2 and are released as gas.
Explanation:
According to the forces of attraction in molecules where there is attraction between opposite charges the water molecules orient themselves such that their oxygen atoms are facing the sodium.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
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hey siri how do you make ice cube ????????????????????????????????????
Answer:
1.Get a ice cub tray.
2. fill cold water to the top.
3. Put the tray in the freezer.
4 let them sit for 3-4 hours.
5.Enjoy!
Explanation:
Answer:
put hotdogs in water boil em. put the water in the cube thingy and put it in the freezer
At a certain temperature the vapor pressure of pure acetyl bromide is measured to be . Suppose a solution is prepared by mixing of acetyl bromide and of heptane . Calculate the partial pressure of acetyl bromide vapor above this solution. Round your answer to significant digits. Note for advanced students: you may assume the solution is ideal.
Answer:
0.17 atm
Explanation:
Raoult´s law can be applied in solving this problem:
Pa= XaPºa (a= acetyl bromide in this case)
where Pa = partial pressure acetyl bromide
Xa = mole fraction of acetyl bromide in the solution
Pºa= vapor pressure of pure acetyl bromide = 0.75 atm(given)
Hence we can find the mole fraction of the acetone in the mixture:
Let the number of moles of acetone be a and the number of moles of thiophene be t
Xa = mol of a / ( mol of a + mol of t )
We now have;
Molar Weight of a= 112.95 g/mol
number of moles of a = 51.8 g/mol x 1 mol/122.95 g = 0.42 moles
Molar Weight of t = 84.14 g/mol
number of moles of t = 123 g x 1mol/84.14 g= 1.46 mol
mole fraction of a; Xa = 0.42/ (0.42 + 1.46) = 0.22
Pa = 0.22 x 0.75 atm = 0.17 atm
What is tree rings tell us?
Answer:each of a number of concentric rings in the cross section of a tree trunk, representing a single year's growth.
Explanation:it tell whats the age of the tree.
PLS HELP ASAP I NEED NUMBER 8
Explanation:
determine the genotypes of the parent organisms.
write down your "cross" (mating)
draw a p-square.
4. " ...
determine the possible genotypes of the offspring by filling in the p-square.
summarize results (genotypes & phenotypes of offspring)
A student experimentally determines the density of a metal cube. The edge length of the cube is measured using calipers. The cube's true density is 12.30 g/cm. Use the student's collected data below and calculate the percent error for the measurement.
Student's Collected Data:
Cube's Mass 551786
Edge Length 1.72 cm
Percent error= _______%
Answer:
10.9%.
Explanation:
The first thing to do in order to solve this question is to Determine the value for the volume of the the cube. This can be done by taking the cube root of the length of the cube;
The volume of the cube = (length of the cube)^3 = length × length × length = 1.72 × 1.72 × 1.72 =( 1.72)^3 = 5.09cm^3.
The next thing you do is to Determine the exponential density, the can be done by using the formula below;
The exponential density = mass/ volume = 55. 786/ 5.09 = 10.96 g/cm^3.
Therefore, the percent error = (true density of the cube - exponential density of the cube)÷ true density of the cube × 100.
Hence, the percent error = 12.30 - 10.96/12.30 × 100 = 10.9%.
what is a physical change
cutting a piece of paper
Explanation:
Answer:
A physical change occurs when a substance changes, but no new substance is formed.
Explanation:
According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide? *
Mass of Mercury(Hg) : 55.8 g
Further explanationGiven
Reaction
2HgO ⇒ O₂ + 2Hg
Required
Mass of Mercury
Solution
Conservation of mass applies to a closed system, where the masses before and after the reaction are the same
So mass of reactants = mass of products
Mass of reactants = mass HgO = 60 g
Mass of products = mass O₂ + mass Hg
60 g = 4.2 g + mass Hg
mass Hg = 60 - 4.2
mass Hg = 55.8 g
The solubility in water of ionic compound X is measured and found to be 0.776g/mL at 15.°C. Calculate the volume of a saturated solution of X in water that would contain 34.0g of X at this temperature. Be sure your answer has the correct unit symbol and 3 significant digits.
Answer: The volume of a saturated solution of X in water that would contain 34.0g of X is 43.9 ml
Explanation:
Solubility is defined as the amount of solute dissolved per 100 ml of the solvent at a fixed temperatur.
Given : solubility of ionic compound X in water at [tex]15^0C[/tex] = 0.776 g/ml
0.774 g of X is contained in = 1 ml
Thus 34.0 g g of X is contained in = [tex]\frac{1}{0.774}\times 34.0=43.9 ml[/tex]
Thus the volume of a saturated solution of X in water that would contain 34.0g of X is 43.9 ml
what is the change in the velocity of the biker below as he travels from point b to point c ? ..... What is his acceleration from point b to point c ?
The change in the velocity = 4 m/s
Acceleration = 4 m/s²
Further explanationGiven
vo = initial velocity = 4 m/s
vf = final velocity = 8 m/s
t = 1 s
Required
The change in the velocity
Acceleration
Solution
the change in velocity =
[tex]\tt vf-vo=8-4=4~m/s[/tex]
Acceleration = ratio of a change in velocity and the time
[tex]\tt a=\dfrac{\Delta v}{t}= \dfrac{vf-vo}{t}[/tex]
Input the value :
[tex]\tt a=\dfrac{4~m/s}{1~s}=4~m/s^2[/tex]
how would you describe a solid substance appearance before melting
Consider the combustion of propane: A balloon is being inflated to its full extent by heating the air inside it. In the final stages of this process, the volume of the balloon changes from L to L by the addition of J energy as heat. Assume that all the heat comes from the combustion of propane. What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 50.% efficient?
Answer:
5162.539 g
Explanation:
Let assume that the volume changes from [tex]4.00 \times 10^6 \ L[/tex] to [tex]4.50 \times 10^6 \ L[/tex].
And if the addition of energy as heat is [tex]1.3 \times 10^8 \ J[/tex]
Then; we can say that the total heat that is taken by the ballon = [tex]1.3 \times 10^8 \ J[/tex]
[tex]= 1.3 \times 10^5 \ kJ[/tex]
The total heat supplied = total heat coming from the combustion of propane
∴
[tex]= \dfrac{100}{50} \times 1.3 \times 10^5 \ kJ[/tex]
[tex]= 2.6 \times 10^5 \ kJ[/tex]
[tex]C_3 H_{8(g)} + 5O_{2(g)} \to #CO_{2(g)} + 4H_2O_{(l)} \ \ \Delta H = -2221 \ kJ[/tex]
If 2221 kJ is produced as a result of the combustion of 44.1 g [tex]C_3H_{8(g)}[/tex]
Then;
[tex]2.6 \times 10^5 kJ[/tex] will produce [tex]= \Big( \dfrac{44.1 \times 2.6 \times 10^5}{2221} \Big ) \ g[/tex]
= 5162.539 g
Thus, the mass of the propane that must be burned = 5162.539 g
I NEED HELP PLEASE!!!! CHEMISTRY QUESTION: If 38 g of Li3P and 15 grams of Al2O3 are reacted, what total mass of products will result? Why?
Answer:
21.5 g.
Explanation:
Hello!
In this case, since the reaction between the given compounds is:
[tex]2Li_3P+Al_2O_3\rightarrow 3Li_2O+2AlP[/tex]
We can see that according to the law of conservation of mass, which states that matter is neither created nor destroyed during a chemical reaction, the total mass of products equals the total mass of reactants based on the stoichiometric proportions; in such a way, we first need to compute the reacted moles of Li3P as shown below:
[tex]n_{Li_3P}^{reacted}=38gLi_3P*\frac{1molLi_3P}{51.8gLi_3P}=0.73molLi_3P[/tex]
Now, the moles of Li3P consumed by 15 g of Al2O3:
[tex]n_{Li_3P}^{consumed \ by \ Al_2O_3}=15gAl_2O_3*\frac{1molAl_2O_3}{101.96gAl_2O_3} *\frac{2molLi_3P}{1molAl_2O_3} =0.29molLi_3P[/tex]
Thus, we infer that just 0.29 moles of 0.73 react to form products; which means that the mass of formed products is:
[tex]m_{Li_2O}=0.29molLi_3P*\frac{3molLi_2O}{2molLi_3P} *\frac{29.88gLi_2O}{1molLi_2O} =13gLi_2O\\\\m_{AlP}=0.29molLi_3P*\frac{2molAlP}{2molLi_3P} *\frac{57.95gAlP}{1molAlP} =8.5gAlP[/tex]
Therefore, the total mass of products is:
[tex]m_{products}=13g+8.5g\\\\m_{products}=21.5g[/tex]
Which is not the same to the reactants (53 g) because there is an excess of Li₃P.
Best Regards!
Based on the organization and colors in the periodic table, which
two elements do you think are most similar in terms of their properties:
magnesium (Mg), barium (Ba), and gold (Au)? Explain.
Answer:
Magnesium (Mg) and Barium (Ba) are most similar in terms of properties.
Explanation:
The periodic table of elements is organized with elements classified by atomic number. Each column in the table represents elements grouped together by protons in the nucleus and as a result of that also charge. The first column of elements have a +1 charge, while the second column have a +2 charge.
Electronegativity, mass and weight can also be determined by the location of elements in the table, with elements becoming more electronegative from left (least amount) to right (most) and more heavy from top to bottom. Because Magnesium and Barium are in the same column, while gold is in a different column (and assigned a different color) it indicates the element gold is not like the other two and has different properties.
Based on the organization of elements in the periodic table, the two elements that will be similar are magnesium (Mg), barium (Ba).
The periodic table is arranged in rows called periods and columns called groups.
Elements in the same group of the periodic table are chemically similar because they have the same number of electrons in their outermost shell and consequently undergo the same kind of chemical reactions.
Having said that, Barium and magnesium both belong to group 2 of the periodic table hence they have the similar properties because they are all members of the same group.
Learn more: https://brainly.com/question/11155928
What element has 70 electrons and 102 neutrons?
Answer:
The answer is Ytterbium but it is one of it isoptoped so techniacally it would be Ytterbium 102.
What is Displacementsubject Physics,
Explanation:
Displacement is the distance travelled in a specific direction. Unlike distance, displacement is a vector quantity with both magnitude and directional attribute.
When we specific displacement values, we must indicate the direction of motion to complete its description.
For example, 50m is a distance value. It has a magnitude but no direction.
When we say 50m due south, this is a displacement because both magnitude and direction are accurately specified and defined.
