Answer:
See explanation
Explanation:
We know that we obtain the w/v % concentration as follows;
w/v (%) = [mass solute (g) ÷ volume solution (mL)] × 100
volume of solution = 4.93 mL
So,
For dextromethorphan
0.25 = mass/4.93 * 100
0.25 * 4.93 = 100 mass
mass = 0.25 * 4.93/100
mass = 0.0123 g
For guaifenisin,
1.1 = mass/4.93 * 100
1.1 * 4.93 = 100 mass
mass = 1.1 * 4.93/100
mass = 0.0542g
- A compound contains 4.56g. of Pb, 2.3g Cl, and 3.1g 0. What is the percent
composition for each element?
please show work
What causes the periodic (recurring)
patterns seen in the periodic table?
You need to buy some shirts and pants for
school. Pants cost $20 each and shirts cost
$15 each. You have $120, and need to buy at
least 9 items.
Answer:
Explanation: I did the work online because I just worked on this.
marking brainliest please help
What is the lanthanide with least mass, periodic table?
Answer:
Europium/Eu ( not really sure )
The lanthanide element with the least mass is Lutetium (Lu)
Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.
Hence, lutetium is the lanthanide element with the least mass.
Learn more about lanthanide elements here:
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What happens to the energy of gas particles when an elastic collision takes place?
Select one:
a.The more massive gas particle gains energy
b.The least massive gas particle looses energy
c.The more massive gas particle looses energy
d.No energy is exchanged between the gas particles
Answer:
the answer is D
Explanation:
When the elastic collision happens the particles energy does not change. There is no loss or gain of energy due to the elastic collision.
The energy of gas particles when an elastic collision takes place then "No energy is exchanged between the gas particles"
What is elastic collision?A collision between two bodies that would be elastic occurs when their combined kinetic energy stays constant.
What is energy?Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.
When two objects collide, there was no net loss of kinetic energy across the system. This is known as an elastic collision. In elastic collisions, momentum, as well as kinetic energy would both be conserved.
Therefore the correct answer will be option (d)
To know more elastic collisions and energy
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**PLEASE SHOW YOUR WORK**Calculate how much energy would be necessary to convert 250.0 grams of ice at -30°C to steam at 145°C.
Assume that the only time that liquid water changes to gas is when it is boiling. Please help me
Answer:
Q= mc∆T(ice) + mLF(ice) + mc∆T(water) + mLV(water) + mc∆T(steam)
m=250 g = 0.25 kg = ¼ kg c(ice)= 2100 J/kg.K c(water)= 4200 J/kg.K LF(ice)= 333.7 kJ/kg LV(water)= 2256 kJ/kg c(steam)= 2080 J/kg.K
Explanation:
Q= ¼ × 2100 × (0°-(-30°)) + ¼ × 333700 + ¼ × 4200 × (100°-0°) + ¼ × 2256000 + ¼ × 2080 × (145°-100°)
Q= 15750 + 83425 + 105000 + 564000 + 23400
Q= 791575 J
If a piece of paper with a mass of 1.3 grams is shredded into pieces and then it's weighed again so what would be the mass of the paper shreds?
Option 1: More than 1.3 grams
Option 2: stays the same (1.3 grams)
or
Option 3: Less than 1.3 grams
Answer:
option 2
Explanation:
Which indicates how evidence of climate change supports the theory of continental drift?
1. coal fields in several continents
2. volcano formation
3. glacial evidence
4. folded mountains in Africa and South America
Answer:
glacial evidence found in South America
Answer: C. Glacial evidence
314.5g HBr (MMHBr = 80.91g/mol), is mixed into 4.50L solution. Find Molarity (M) of the
solution.
Answer:
[tex]\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}[/tex]
Explanation:
The molarity of a solution is the moles per liter. It is found using this formula:
[tex]M=\frac { moles \ of \ solute}{liters \ of \ solution}[/tex]
First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.
[tex]\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Multiply by the given number of grams.
[tex]314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Flip the fraction so the grams of HBr cancel.
[tex]314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}[/tex]
[tex]\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr[/tex]
Now we know the moles, and can calculate the molarity.
There are 3.88703497714 moles of solute and 4.50 Liters of solution.
[tex]M= \frac {3.88703497714 \ mol }{ 4.50 \ L}[/tex]
[tex]M= 0.863785550476 \ mol/ L[/tex]
The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.
The 7 in the ten thousandth place tells us to round the 3 to a 4.
[tex]M \approx 0.864 \ mol/ L[/tex]
[tex]M \approx 0.864 \ M \ HBr[/tex]
The molarity of the solution is about 0.864 M HBr.
complete the bolded items in each box below
Show the bolded items and the boxes.
What does the steepness of the line on the graph represent?
Answer:
The steepness of a hill is called a slope. The same goes for the steepness of a line. The slope is defined as the ratio of the vertical change between two points, the rise, to the horizontal change between the same two points, the run.
Question 7 of 10
The Sun has a diameter of about 865,000 miles.
Suppose you were making a scale model of the
solar system with a scale of 1 inch:1,000 miles.
How wide would the Sun be in your model?
A. 865,000 inches
B. 865 inches
C. 86.5 inches
O D. 8.65 inches
Answer:
you have to decide 865,000 with 1000 and the answer is 865
what is the radius of a circle i
s
What kind of reaction is 2H202 → 2H20 + O2?
O A. Decomposition
O B. Single-replacement
C. Double-replacement
O D. Synthesis
Answer:
this reaction is so the answer should be A
how should baking pizza be categorized
Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy
Explanation:
Answer:
endothermic; the dough absorbs heat
Explanation:
EDG2020
Write the systematic names of the following
I think it's aluminium chloride
the number of ___ in an atom tells you how many chemical bonds that atom can form
Why does nobody fking answer my questions.
How did stromatolites contribute oxygen to the early atmosphere?
through methane degradation
through photolysis
by weathering of rocks
through photosynthesis
Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Answer:
weathering of rocks is the answer to your question
Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level after several minutes. What is the flaw in the student’s investigation, and how can the students improve their investigation to correctly determine the relationship?
A.
The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for how density and volume affects pressure.
B.
The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume affects pressure.
C.
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
D.
To keep the volume of the balloon from changing, so they can focus on temperature and pressure they need to use a container that does not expand like a balloon. A constainer made of plastic or metal to hold the air.
Answer:
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
Explanation:
1. The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of the molecule.
Show work please
Answer:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Explanation:
In the electrolysis of molten lead bromide, what is the product at the anode?
Answer:
it is the second one. Lead
Solve this puzzle
R+R
HELP PLEASE Which type of power generation can produce carbon dioxide? solar hydroelectric coal wind
Answer:
COAL
Explanation:
Answer:
Coal!
Explanation:
Hope this helps!
In what way is heat transferred to the tubes? (Hint “touching’”)
Please help
I will give you Brainliest
Answer:
in heat transfer, as the fluid flows along the tube, the wall layers are heated or cooled. temp. variation occurs in the wall layers.
good luck :)
i hope this helps
have a great day !!
In a chemical reaction between copper metal and silver nitrate, 12.7 g of copper(II) and 64.5 g of silver nitrate react, and 38.1 g of Silver is produced. 21) Predict the products and write the balanced equation and include the physical state of each. 22) What type of chemical reaction is this? 23) Which is the limiting reactant? You must include the work for this to receive full credit. 24) What mass of excess is used up, and what mass is left over? 25) Calculate the percent yield.
Answer:What should you do if you realize during research that your original theory is wrong
Explanation:
how many significant figures are in the measurement 12.4 kg
list the factor on which Ka of a weak acid depends
Help! Need it ASAP!
Is steam and vapour different? If they are then how are they different?
Answer:
Explanation:
Water vapor is when water molecules are present in the air, while steam is water heated to the point that it turns into gas. In simplified science, both are referred to as the gaseous state of water. Steam is usually white or translucent in nature, while water vapor can be clear or translucent.
Steam is simply, water vapor. Hence, the key difference between steam and vapor is that steam is the gaseous state of water whereas vapor is the gaseous state of any substance. Moreover, steam is typically invisible while the vapor of some substances is colorful.
Plants are able to grow toward the light due to the process known as phototropism. This process takes place inside the plant. Is i Behavioral,structural,or Physiological
Answer:
Physiological
Explanation:
The process whereby plants respond and grow towards light is a physiological process.
Physiological processes are life-sustaining processes that require the combined efforts of cells, tissues, organs, and or systems along with that of biomolecules in the body.
The response of plants to light requires the efforts of a hormone that triggers the rapid mitotic division of cells of tissues/organs that are directly opposite the light source. Thus, the faster rate of division of these cells as compared to the cells of tissues/organs that are directly in contact with light leads to the plant's tissues/organs bending towards the light.