Answer:
223.4J
Explanation:
Given parameters:
Specific heat capacity of substance = 0.38J/g°C
Mass of substance = 42g
Initial temperature = 25°C
Final temperature = 39°C
Unknown:
Energy required to raise the temperature = ?
Solution:
The amount of heat required by the substances can be derived using the expression below;
H = m c Δt
H is the amount of heat energy
m is the mass
c is the specific heat capacity
Δt is the change in temperature;
Δt = 39°C - 25°C = 14°C
Now insert the parameters and solve;
H = 42 x 0.38 x 14 = 223.4J
Calculate the mass of 5.3 moles of chloric acid (hcl03)
Calcium metal reacts with hydrochloric acid (HCl) to form aq calcium chloride and hydrogen gas.
Ca(s)+2HCl(aq) -----------> CaCl2(aq)+H2(g)
0.401 g of calcium metal is reacted with 0.350L of 0.0400M hydrochloric acid.
(a) Write the complete ionic equation of the reaction.
(b) Calculate the moles of calcium and hydrochloric acid.
(c) Identify the limiting reagent.
(d) Assuming complete reation, determine the moels of excess reagent that reamains in the reaction.
Answer:
a. Ca(s) + 2H⁺ → Ca²⁺ + H₂(g)
b. 0.0100 moles Ca; 0.0140 moles HCl.
c. HCl is limiting reactant.
d. 0.0030 moles of Ca
Explanation:
a. In water, HCl dissociates in H⁺ and Cl⁻ and CaCl₂ in Ca²⁺ and 2 Cl⁻. The ionic equation is:
Ca(s) + 2H⁺ + 2Cl⁻ → Ca²⁺ + 2Cl⁻ + H₂(g)
Ca(s) + 2H⁺ → Ca²⁺ + H₂(g)b. Moles Ca -Molar mass 40.1g/mol-:
0.401g * (1mol / 40.1g) = 0.0100 moles Ca
Moles HCl:
0.350L * (0.0400mol / L) = 0.0140 moles HCl
c. In the reaction, 1 mole of Calcium reacts with 2 moles of HCl.
For a complete reaction of 0.0100 moles of Calcium there are necessaries:
0.0100mol Ca * (2 mol HCl / 1 mol Ca) = 0.0200 moles HCl
As there are just 0.0140 moles of HCl,
HCl is limiting reactant
d. For a complete reaction of 0.0140 moles of HCl, the moles of Ca that react are:
0.0140 moles HCl * (1 mol Ca / 2 mol HCl) = 0.0070 moles Ca
That means will remain:
0.0100 moles - 0.0070 moles:
0.0030 moles of Ca
Which of these is given away or accepted by an atom when it reacts with other atoms?
Electron
Neutron
Nucleus
Proton
A; Electron is your answer.
Answer:
Electron
Explanation:
An atom can either gain, share, transfer, and/or lose electron(s)
PLEASE PLEASE ANSERR THIS PLEASEEEE
Answer:
I think it is c
Explanation:
What type of cells are gametes?
Answer:
Reproductive cells(also known as sex cells) are gametes.
Explanation:
Have a great day :)
Answer:
Gametes are an organism's reproductive cells
Explanation:
Determine the mass of CaCl2·2H2O(MW 147.02g/mole) to weigh out using a four-place analytical balance to prepare 100mL of a 0.1005M solution of Ca2+.
Answer:
1.4776 g
Explanation:
First, let us determine the number of moles present in 100 mL of 0.1005 M solution of Ca2+.
mole = molarity x volume in Liter
mole of Ca2+ = 0.1005 x 0.1 = 0.01005
Also,
mole = mass/molar mass
mass of 0.01005 mole Ca2+ = mole x molar mass
= 0.01005 x 147.02 = 1.4776 g
Since 1 mole of Ca2+ is present is 1 mole of CaCl2·2H2O, 1.4776 g of CaCl2·2H2O would be weighed out in order to prepare 00mL of a 0.1005M solution of Ca2+.
To prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
We must use the molar mass and molarity formula to calculate the mass of [tex]CaCl_2.2H_2O[/tex] needed to make a 0.1005 M solution of [tex]Ca^2^+[/tex].
Let's start by figuring out how many moles of [tex]Ca^2^+[/tex]are needed for the solution:
Molarity (M) = moles/volume (L)
0.1005 M = x moles/0.1 L (100 mL converted to liters)
x = 0.1005 moles of [tex]Ca^2^+[/tex]
So, the molar mass of [tex]CaCl_2.2H_2O[/tex]:
Ca (40.08 g/mol) + 2Cl (35.45 g/mol) + 2([tex]H_2O[/tex]) (2 * 18.02 g/mol) = 147.02 g/mol
Then, we calculate the mass
Mass = moles * molar mass
Mass = 0.1005 moles * 147.02 g/mol
Mass = 14.737 grams
Therefore, to prepare a 100 mL solution of 0.1005 M [tex]Ca^2^+[/tex], we would need to weigh out approximately 14.737 grams of [tex]CaCl_2.2H_2O[/tex].
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A duck migrates South for the winter about 3000 miles each year. It takes them about 65 hours to travel this distance. What is the velocity of the duck?
Answer:
46.15
Explanation:
Which of the following is true about wind and water changing the size of mountains over many millions of years? A: The continuous movement of wind and water changes the size of mountains over many millions of years B: Nothing can change the size of mountains over many millions of years not even the continuous movement of wind and water. C: The continuous movement of wind and water changes the size of some mountains, but not all mountains D: Even though mountains change in size over many millions of years, the changes are not due to the continuous movement of wind and water
Answer:
I would say A
Explanation:
normally wind and water will work together to erode or brake away a cliff or mountain.
There is an example of this in Illinois (There are eroded away cliffs located next to the Mississippi River, they stretch from around Grafton to Alton).
A
map shows the physical properties or characteristics of a region.
highway
topographical
population
computer
compound
Answer:
Topographical is the correct ans
3
Select the correct answer.
Which form of light can a human eye see?
O A infrared light
OB.
near-infrared light
-
O c. ultraviolet light
OD
visible light
Answer:
human can see visible light
Answer:
i beleive it is D. visible light
Explanation:
if im wrong sorry this subject isnt my forte
A child and his mother both have blue eyes. They both have blue eyes because inherited traits of an organism are governed by the -
A. chromosomes found in the genes
B. nucleus found in the chromosomes
C. genetic material found in the nucleus
D. genes found in the cytoplasm
Answer: the answer is C hope it helps
Explanation:
Explain how the petrol and bitumen fractions differ in their properties and uses. (6 marks)
Explanation:
petrol or bitumen and at least one use of petrol and at least one use of bitumen eg petrol has a lower boiling point and is used as a fuel in cars, bitumen is more viscous and is used to surface roads.Aug 19, 2015
Petrol and bitumen fractions differ in their properties and uses in a number of ways with regard to melting point, viscosity, ignition ,combustion .
What is the difference between petrol and bitumen fractions?Petrol has less number of carbon chains while bitumen has large number of carbon chains.Bitumen has higher melting and boiling point as compared to petrol.
Petrol has higher viscosity as compared to bitumen.It combusts easily while bitumen does not combust completely ,it produces large number of carbon monoxide or soot.
Petrol fractions are used in cars,motorbikes,etc. while bitumen fractions are used in road surfaces and roofing. Boiling point of petrol is 35-70°C while that of bitumen is 700°C.Bitumen is more viscous as compared to petrol.
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What evidence was used in the investigation of the Gaetane Bouchard's murder? Was it considered class evidence or individual evidence?
Answer:
class i believe
Explanation:
HELP!!!
IF YOU DONT KNOW THE ANSWER THEN PLEASE DONT ANSWER!!
Answer:
1. melting
2. freezing
5. condensation
6. evaporation
A 30.0 mL sample of 0.200 M Ba(OH)2 is titrated with 0.100 M HCl.
a) Determine the pH of the solution before the addition of HCl.
b) Determine the pH of the solution after the addition of 25.0 mL HCl.
Answer:
what's the question? is it A
A 30.0 ml sample of 0.200 M Ba(OH)2 is titrated with 0.100 M HCl. teh pH will be:
a) The pH of the solution before the addition of HCl is 13.301.
b) The pH of the solution after the addition of 25.0 mL HCl is 13.494.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
a)
[tex]\rm Ba(OH)_2 = Ba_2+ + 2OH^-Ba(OH)_2[/tex]
Given, [OH¯] = 0.200 M
pOH = -log 0.200 = 0.699
pH = 14.000 - pOH = 14.000 - 0.699 = 13.301
b)
Now 25 ml HCl is added
0.025 × 0.100 = 0.0025
Moles of OH = 0.02 × 0.0025 = 0.0005
Remaining OH = 0.0025 – 0.0005 = 0.00245
Now calculate the pH
0.055 is divided by 0.200 = 0.275
pOH = -log 0.275 = 0.5606
pH = 14.000 - 0.5606 = 13.4394
Thus, a) 13.301.
b) 13.4394.
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A sample of gas contains 0.1200 mol of NH3(g) and 0.1500 mol of O2(g) and occupies a volume of 13.0 L. The following reaction takes place: 4NH3(g) + 5O2(g)4NO(g) + 6H2O(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
Answer:
14.44 Liters
Explanation:
4NH3(g) + 5O2(g) -----> 4NO(g) + 6H2O(g)
From the equation of the reaction, the mole ratio of NH3 to NO2 = 1:1
Therefore 0.12 moles of NH# produces 0.12 moles of NO
Also from the equation of reaction, mole ratio of NH3 to H20 is 4:6
Therefore, 0.12 moles of NH3 will produce 0.12 * 6/ 4 moles of H2O =0 0.18 moles of H2O
Total moles of gases produced = 0.30 mole
From Avogadro's law:
v1/n1 = v2/n2
v1 = 13.0 L
n1 = 0.12 + 0.15= 0.27 moles
v2 = ? =
n2 = 0.30
V2 = v1n2/n1
v2 = 13.0 * 0.30/0.27
V2 = 14.44 Liters
The molar mass of an imaginary molecule is is 93.89 g/mol. Determine its density at STP.
Answer:
Density = 4.191 gm/L
Explanation:
Given:
Molar mass = 93.89 g/mol
Volume(Missing) = 22.4 L (Approx)
Find:
Density at STP
Computation:
Density = Mass/Volume
Density = 93.89 / 22.4
Density = 4.191 gm/L
Dry ice is carbon dioxide in the solid state. 1.28 grams of dry ice is placed in a 5.00 L chamber that is maintained at 35.1°C. What is the pressure in the chamber after all of the dry ice has sublimed? Assume ideal gas behavior.
Answer:
0.15atm
Explanation:
Given parameters:
Mass of dry ice = 1.28g
Volume of chamber = 5L
Temperature = 35.1°C = 35.1 + 273 = 308.1K
Unknown:
Pressure in the chamber = ?
Solution:
As we assume ideality for the gases in the cylinder, we use the equation below to solve the problem;
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmdm³mol⁻¹k⁻¹
T is the temperature
Let us find the number of moles;
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Number of moles of CO₂ = [tex]\frac{mass}{molar mass}[/tex]
Number of moles of CO₂ = [tex]\frac{1.28}{44}[/tex] = 0.03moles
So;
Input the parameters and solve;
P x 5 = 0.03 x 0.082 x 308.1
5P = 0.73
P = [tex]\frac{0.73}{5}[/tex] = 0.15atm
What statement best describes what a circle graph shows?
A. The average of a data set
B. A frequency distribution
ООО
C. The relationship between two variables
D. Data as proportions of a whole
Which is the best example for genetic diversity?
Answer:
Genetic Diversity Examples
Different breeds of dogs. ...Different varieties of rose flower, wheat, etc.There are more than 50,000 varieties of rice and more than a thousand varieties of mangoes found in India.Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species.
Explanation:
i hope this helps u.
HELPPP!!!
Empty chemical containers may be re-used for storing food or water after thorough washing.
False
True
Answer:
False
Explanation:
That would still be very unsafe
Answer:
False
Explanation:
even thought it may be washed completely certain chemicals can still remain and be harmful when you consume the food that is put into. Especially if you add heat or cold to the container.
What is the mass number of an atom that has six protons , six electrons and eight neutrons
Answer:
14
Explanation:
Given parameters:
Number of protons = 6
Number of electrons = 6
Number of neutrons = 8
Unknown:
Mass number = ?
Solution:
The mass number of an atom is the sum of protons and neutrons in an atom;
Mass number = number of protons + number of neutrons
Mass number = 6 + 8 = 14
When you consume food, it goes through mechanical and chemical digestion in the mouth and is then transported to the
stomach. It then mixes with stomach acid and other enzymes. What type of digestion is taking place within the stomach?
Physical change
Absorption
Mechanical digestion
Chemical digestion
Answer:
Chemical digestion
Explanation:
The type of digestion taking place within the stomach is chemical digestion. When food reacts with stomach acids and other enzymes, a reaction takes place which reduces the food into simpler bits.
The stomach contains strong digestive acids. Cells in the stomach secrete hydrochloric acid to further aid the digestion of the food. This way, complex organic molecules becomes broken down into simpler units.What’s the full electronic configuration for lead
Answer:
1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p2.
Explanation:
mark as brainliest
9.78 cm equals how many
mm
Answer:
97.8
Explanation:
Sal drew the electron dot diagram as shown.
How should Sal correct diagram?
Answer:
Answer: He should add a single dot below the symbol to correct the electron dot diagram of an aluminium atom.
Explanation: Electron dot structures are the structures in which valence electrons around an atom are shown. The electrons are represented as dots in these structures.
Aluminium is the 13th element of the periodic table.
Electronic configuration of Aluminium is given by:
Valence electrons of aluminium = 3
In the given image, 2 valence electrons are shown and total number of valence electrons are 3. So, in order to correct the diagram, he should add a single electron below the symbol.
Explanation:
yes giuve me brainliest
What force works against friction
Answer:
work done
Explanation:
i think
work done
this is answer
Their was a watch and learn assignment and I wasn’t paying attention and we had questions so if you guys have ever done this before please help me out. You can’t answer if you haven’t your teacher conduct this experiment or if you have answers from a friend or something
Which of the following is a pure substance?
Answer:
Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances
Explanation:
β-Myrcene, a key intermediate in the production of several fragrances, is 7-methyl-3-methylene-1,6-octadiene.Draw the structure of this triene.
Answer:
this is the structure of beta myrcene but im notsure which structure you were looking for
