In a collection of marbles, 25% of the marbles have a mass of 5.00 g and 75% of the marbles have a mass of 7.00 g. The average mass of a marble is 6.50 g.
What should you use to compare one substance with another substance in a reaction?
Answer:
metal or other acids
Explanation: hope u get it right
What is the percentage by mass of sulphur in Al2(SO4)3[A12SO4 =
342g/mol, S = 32]
Answer: The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
Explanation:
Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.
[tex]{\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%[/tex]
Given: mass of sulphur = 32 g/mol
mass of [tex]Al_2(SO_4)_3[/tex] = 342 g/mol
Putting in the values we get:
[tex]{\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%[/tex]
The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
how many moles are 2.54×10^29 molecules of H20
Answer:
Explanation: The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.
Select what would most likely happen.
A. The plant population would increase; the fish population would increase.
B. The plant population would decrease; the fish population would increase.
C. The plant population would stay the same; the fish people would decrease.
D. The plant population would increase; the fish people would decrease.
Given the balanced reaction: 2KOH + H2SO4 → 2H20 + K2SO4
What mass of KOH is required to react completely with 2.70 grams of
H2SO4 to produce K2SO4 and water?
Molar mass of H2SO4 is 98 grams.
Molar mass of KOH is 56 grams.
O 2.36 g
O 3.09 g
4.73 g
O 1.54 g
I will give brainliest
Answer: 3.09 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2SO_4=\frac{2.70g}{98g/mol}=0.0275moles[/tex]
The balanced chemical equation is
[tex]2KOH+H_2SO_4\rightarrow 6H_2O+K_2SO_4[/tex]
According to stoichiometry :
1 mole of [tex]H_2SO_4[/tex] require 2 moles of [tex]KOH[/tex]
Thus 0.0275 moles of [tex]H_2SO_4[/tex] will require=[tex]\frac{2}{1}\times 0.0275=0.0551moles[/tex] of [tex]KOH[/tex]
Mass of [tex]KOH=moles\times {\text {Molar mass}}=0.0551moles\times 56g/mol=3.09g[/tex]
Thus 3.09 g of KOH is required to react completely with 2.70 grams of
[tex]H_2SO_4[/tex]
A 0.5 kg arrow was shot at a target. The arrow accelerated at 200 m/s2. What was
the net force on the arrow to the nearest newton?
Record your answer and be sure to use the correct place value.
Answer: I think 100?
Explanation:
It’s asking for the net FORCE! And the formula to find force is to multiply the mass by the acceleration which would be in this case 0.5x200 which would be 100
How are the sun and Earth's moon different? (2 points)
a
The sun is a ball of gases that revolves around Earth, while the moon is the center of the solar system.
b
The sun is a ball of rock and gas, while the moon is a ball of rock that revolves around the sun.
c
The sun is the center of the solar system, while the moon is a ball of rock that revolves around Earth.
d
The moon is the center of the solar system, while the sun is the center of the Milky Way.
25) Which of the following would exert the most pressure on the ground? 3 points
A woman standing in running shoes
O A Woman standing in high heels
A woman sitting on the ground
O It doesn't make any difference as long as the weight is the same.
C
ادا آمد
collina abinet avontually
Answer:
a women standing in high heels
Explanation:
Answer:
A woman standing in high heels
What are some ways your local environment would be affected if there was suddenly less water available?
I'll mark brainliest!
plant life dies
Explanation:
if all water disappears then plants would dry up and die, wich would impact the food chain
Au + FeSO4= ?????????
Answer:
what
Explanation:
An object traveling around another object space is in blank
Answer: An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon. Many planets have moons that orbit them
HOPE THIS HELPS
What is the molarity of an aqueous solution that contains 78g of C6H12O6 dissolved in 2500 mL of solution?
Answer:
[tex]\boxed {\boxed {\sf molarity = 0.17 \ M \ C_6H_12O_6}}[/tex]
Explanation:
Molarity is found by dividing the moles of solute by liters of solution.
[tex]molarity = \frac {moles}{liters}[/tex]
We are given grams of a compound and milliliters of solution, so we must make 2 conversions.
1. Gram to Moles
We must use the molar mass. First, use the Periodic Table to find the molar masses of the individual elements.
C: 12.011 g/mol H: 1.008 g/mol O: 15.999 g/molNext, look at the formula and note the subscripts. This tells us the number of atoms in 1 molecule. We multiply the molar mass of each element by its subscript.
6(12.011)+12(1.008)+6(15.999)=180.156 g/mol
Use this number as a ratio.
[tex]\frac {180.156 \ g\ C_6H_12 O_6}{ 1 \ mol \ C_6H_12O_6}[/tex]
Multiply by the given number of grams.
[tex]78 \ g \ C_6H_12O_6 *\frac {180.156 \ g\ C_6H_12 O_6}{ 1 \ mol \ C_6H_12O_6}[/tex]
Flip the fraction and divide.
[tex]78 \ g \ C_6H_12O_6 *\frac { 1 \ mol \ C_6H_12O_6}{180.156 \ g\ C_6H_12 O_6}[/tex]
[tex]\frac { 78 \ mol \ C_6H_12O_6}{180.156 }= 0.432958102977 \ mol \ C_6H_12O_6[/tex]
2. Milliliters to Liters
There are 1000 milliliters in 1 liter.
[tex]\frac {1 \ L }{ 1000 \ mL}[/tex]
Multiply by 2500 mL.
[tex]2500 \ mL* \frac {1 \ L }{ 1000 \ mL}[/tex]
[tex]2500 * \frac {1 \ L }{ 1000 }= 2.5 \ L[/tex]
3. Calculate Molarity
Finally, divide the moles by the liters.
[tex]molarity = \frac {0.432958102977 \ mol \ C_6H_12O_6}{ 2.5 \ L}[/tex]
[tex]molarity = 0.173183241191 \ mol \ C_6H_12O_6/L[/tex]
The original measurement has 2 significant figures, so our answer must have the same. That is the hundredth place and the 3 tells us to leave the 7.
[tex]molarity \approx 0.17 \ mol \ C_6H_12O_6 /L[/tex]
1 mole per liter is also equal to 1 M.
[tex]molarity = 0.17 \ M \ C_6H_12O_6[/tex]
1. In nature, most organisms produce through sexual reproduction. However, there are some that undergo (4)_____. Plants like strawberries and potatoes grow without seeds and spores, instead of using (5)____. In (6)______, you have a single-celled organism that copies the information inside of itself and divides into two identical organisms. Through (7)______, new organisms like yeast grow on parent organisms and split off once they're mature enough to survive independently. This isn't to be confused with (8)_____, which involves organisms splitting apart and growing independently of one another.
Word Bank for #4-8:
• budding
• binary fission
• vegetative propagation
• asexual reproduction
• fragmentation
Answer:
(4) asexual reproduction (5) vegetative propagation (6) binary fission (7) budding (8) fragmentation
The correct words to fill the given blanks would be as follows:
4). A-s-e-x-u-a-l reproduction.
5). Vegetative propagation.
6) Binary fission
7). Budding
8) Fragmentation
Reproduction
Reproduction is denoted as the process by which living organisms generate their younger beings.
Some organisms generate through s-e-x-u-a-l mediums while others generate through the A-s-e-x-u-a-l process.
The a-s-e-x-u-a-l methods of reproduction include:
BuddingFragmentationBinary FissionVegetative Propagation.Spore FormationLearn more about "Organisms" here:
brainly.com/question/9349989
If there are 27 grams of nitrogen dioxide at STP how many liters does this occupy?
Answer:
30 liters
Explanation:
a diagram of the electromagnetic spectrum is shown. which wavelength is the longest safest wavelengths for humans？ Helppp pleaseee
Answer:
radio waves
Explanation:
the answer is simple, radio waves. it is radio waves because when you look at the diagram the waves below Radio are very long. if you look at the waves under gamma ray, they are very short. radio is the longest wave while gamma is the shortest. if you are still confused it also says longer wavelength and low frequency( meaning it is safe) right under the wavelength.
How many grams of water react to form 4.50 moles of Mg(OH)2?
MgO(s) + H20(1)
Mg(OH)2(s)
Answer: mass of water is 81.1 g
Explanation: from reaction eguation you see there are equal amounts of water and Mg(OH)2. Then amount of water is 4.50 mol. Molar mass of water is 18.016 g/mol.
Mass m= n·M= 4.50 mol· 18.016 g/mol = 81.1 g
The number of grams of water reacting to form a mass of water is 81.1 g.
What is mass?Mass is the quantity of matter in a physical body.
The given reaction is
MgO(s) + H₂O(1) → Mg(OH)₂(s)
The number of moles is equal in both sides
The moles of water is 4.50
The molar mass of water is 18.016 g/mol
mass × molar mass
4.50 × 18.016 = 81.1 g.
Thus, the number of grams of water reacting to make a mass of water is 81.1 g.
Learn more about mass
https://brainly.com/question/19694949
A compound is found to be made up of 3.21 g Carbon and 1.02 g Oxygen. Determine the percent composition from this data?
Given :
A compound is found to be made up of 3.21 g Carbon and 1.02 g Oxygen.
To Find :
The percent composition from this data.
Solution :
We know, percentage composition is given by :
[tex]\%mass = \dfrac{mass}{mass of compound}\times 100[/tex]
So, percentage composition of Carbon is :
[tex]\%Carbon = \dfrac{3.21}{3.21+1.02}\times 100\\\\\%Carbon = \dfrac{3.21}{4.23}\times 100\\\\\%Carbon = 75.89 \%[/tex]
Since, compound is made up of Carbon and Oxygen.
So, %Oxygen is ( 100 - 75.89 )% = 24.11%
Hence, this is the required solution.
Heart, veins, arteries, capillaries: Which organ system do these belong to?
O
Digestive
Musculoskeletal
Respiratory
Circulatory
Excretory
Answer:
Circulatory
Explanation:
The circulatory system consists of the heart, lungs, arteries, veins, coronary, and portal vessels.
write any two equations to illustrate that hydrogen gas is a reducing agent
A certain type of material allows electricity to flow through it, but it does not flow quickly or easily through it. Is the material a good or poor conductor? Does it have a low or high resistance?
What happens in a redox reaction?
What happens to an electromagnetic wave as the
frequency (how often a wave hits a crest) decreases?
energy decreases and the wavelength gets shorter
energy increases and the wavelength gets shorter
|
energy decreases and wavelength gets longer
energy increases and the wavelength gets longer
Answer:
Energy decreases and wavelength gets longer.
Explanation:
The energy of a wave is given by :
[tex]E=hf[/tex]
Where
h is Planck's constant
f is the frequency of the wave
As frequency decreases, the energy of the wave also decreases and wavelength gets longer. Hence, the option is (d).
PLZ HELP!
Are water waves transverse or longitudinal? How do you know? IN YOUR OWN WORDS.
Explanation:
Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
How many moles is 80.0 g of calcium?
Answer:
Here we were given the weight of Ca as 80g
and the atomic mass of carbon is 40u(molar mass)
using the formula
n=W/Mwhere w is weight and m is molar mass
80/40
=2
therefore, there are 2 moles in 80g of calcium
Vinegar is added to baking soda and bubbles of carbon dioxide rapidly form. A cloudy liquid is left behind. What are products in this chemical reaction?
Answer:
When baking soda reacts with vinegar, one of the products produced is the gas carbon dioxide.
Answer:
The product left behind is carbon dioxide.
Most of the world’s energy comes from what three sources?
These energy sources are called ______________fuels and they are _____________________ resources.
Answers:
Most of the world’s energy comes from what three sources?
Oil, coal, and gas.
These energy sources are called fossil fuels and they are non-renewable resources.
Fuel type: oil
How it's formed: from the remains of ancient marine organisms
Its uses: transportation, industrial power, heating and lighting, lubricants, petrochemical industry, and use of by-products
Fule type: coal
How it's formed: when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial
Its uses: electricity generation, metal production, cement production, chemical production, gasification, and other industrial uses
Fuel type: gas
How it's formed: decomposed organic matter mixed with mud, silt, and sand on the seafloor
Its uses: heating & cooling buildings, cooking foods, fueling vehicles, and electricity generation
PLSSSSSS ANSWERRRRR???
Answer:
( j ) should be the correct option because atomic number of fluorine is 9 so, no. of electrons and protons should be same I.e. 9
What is the pH of a 1.0 x 10-2 M HNO3 solution?
maksud frasa integrasi nasional
Answer:
Adapun frasa INTEGRASI BANGSA atau INTEGRASI NASIONAL sendiri dimaknai dalam dua konteks yakni POLITIS dan ANTROPOLOGIS. Dalam konteks politis, Integrasi Nasional bermakna sebagai penyatuan berbagai macam kelompok sosial juga budaya ke dalam suatu kesatuan wilayah yang membentuk suatu identitas nasional.
Explanation:
N2(g) + 2 O2(g) → 2 NO2(g)
Answer: 1.057444301e-018
Explanation: