Answer: 0.5 M
Explanation:
molarity = (moles of solute)/(liters of solution)
To find liters of solution, we can convert the 500 grams of water to liters, which is 0.5 L.The formula mass of NaCl is about 58.44 g/mol, so 13.7 grams is about 13.7/58.44 = 0.234 mol.Hence, the molarity is (0.234)/(0.5) = 0.5 M (to 1 s.f.)
A telescope would be MOST useful in answering which question? . O How do rockets move in space? What shape is a human skin cell? O What is on the surface of the Moon? O How do worms breathe underground?
Answer:
what is on the surface of the moon.
Explanation:
What clues indicate that a chemical reaction has occurred?
Choose all correct answers.
the formation of a new liquid
a color change
a temperature change
the formation of bubbles
Answer:
its probably all of the above, if not then it should be the formation of a new liquid, and a color change
Explanation:
Protons and neutrons are made from which of the following particles?
Down quarks only
Hadrons
Up quarks and down quarks
Up quarks only
describe what happens when water vapour cools to liquid water(change in arrangement,change in movement,change in energy)
Answer:
CONDENSATION When steam is cooled, it releases thermal energy and turns into its liquid state. This process is called condensation.
Explanation:
Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in a 36.0-g sample after 45 hours
Answer:
4.5 gm left
Explanation:
45 /15 = 3 half lives (1/2 )^3 =1/8 th
1/8 * 36 = 4.5 gm
how many grams of sodium Phosphate is needed to prepare 5.0 L of a 2.6M solution ?
Molarity is the ratio of the moles and the volume. The mass of 2.6 M sodium phosphate solution is 2131.22 gms.
What is mass?
Mass is the product of the moles and the molar mass of the substance. It is given as,
Mass = Moles × Molar mass
The moles from molar concentration is used to calculate mass as:
Mass = Molarity × volume × molar mass
= 2.6 × 5.0 × 163.94
= 2131.22 gms
Therefore, 2131.22 gms is the mass of sodium phosphate.
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Which of the following equation is balanced?
Answer:
2fe2o3+3c=4fe+3co2
Explanation:
because 2×2 =4 fe &2×3=6 so we put it like 3co2
What property of copper makes it ideal to create thin sheets of
copper?
Copper is a soft, ductile, and malleable metal that bends and stretches easily without breaking. Copper is a versatile metal for construction and manufacturing because of this.
What is the poh in a solution if the [oh-] = 5.42 x 10-5 m?
a
5.26
b
7.26
c
4.26
d
6.26
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
How many kilojoules of heat are produced when 34.0 g of Fe2O3 reacts with an excess of CO according to the following reaction? Fe2O3 + 3 CO 2 Fe + 3 CO2 ΔH = -26.3 kJ
The heat produced when iron oxide reacts with carbon monoxide is -23.47 kJ/mol.
What is the enthalpy of reaction?
The standard enthalpy of the reaction is given by the enthalpy of formation of the products and the reactants. The reactants and the products of the reaction are:
Fe₂O₃ (s) + 3CO (g) → 2Fe(s) + 3CO₂ (g)
We know,
The standard enthalpy of formation of iron oxide = −825.50 kJ/mol
The standard enthalpy of formation of carbon monoxide = −110.53 kJ/mol
The standard enthalpy of formation of carbon dioxide = −393.52 kJ/mol
The standard enthalpy of reaction is calculated as:
[tex]\rm \Delta H_{rxn}[/tex] = [2(0) + 3(−393.52)] - [1(-825.50) + 3(-110.53)]
= (0−1180.56+825.50+331.59)
= −23.47 kJ/mol
Therefore, −23.47 kJ/mol is produced.
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which term best defines the feeding behavior of most gulls?
Answer:
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, most gulls were placed in the genus
[Then mother noticed that two children who are watching the game are sick and coughing.She told her son to keep distance from those children to avoid getting sick]
1.Observe illustration no.1 and read the caption.Why did the mother ask her son to avoid the kid with cough?
2.Observe illustration no.2 and read the caption.Why did the mother let her son play with the kid with asthma?
please don't report this
Answer:
in illustration 1
the mother told her son not to play with the boy having cough because it is a transferable disease which could cause him also to get sick and would get cough.
while in
illustration 2
the mother let the boy play with the boy having asthma because it is not a transferable disease which wold not affect him or any one else.
Explanation:
this is the reason
#1
Cough is a infectious disease .It spreads through the droplets falling outwards during coughing.If her son stays there for long time he would be affected by cough also or he would get sick .So the mother denied .#2
Asthama is although a disease of lungs but it doesn't spread through air or droplets.It's not infectious .So nothing would happen if her child playsYou and your classmates are working to develop a prototype for a new type of drone. The drone needs to fly and will be controlled by a remote control. Which STEM fields would be most important for you to have knowledge of to build this drone?
A) chemistry and botany
B) astronomy and geology
C) medicine and geology
D) physics and computer science
What is the color of bromocresol green indicator in a solution with a ph value of 2. 0.
Answer:
The answer would be "Yellow"
Explanation:
Hope this helps!
A nuclide of phosphorus 3015P decays into a nuclide of silicon 3014Si. In order to satisfy charge conservation and lepton number conservation the other products must be __________.
In order to satisfy charge conservation and lepton number conservation the other products must be neutron.
What is conservation of mass?
The principle of conservation of mass states that, the sum of the initial mass of reactants must be equal to final mass of the products.
[tex]_{15}^{30}P\ --- > \ _{14}^{30} Si \ + \ ^{0}_{1} n[/tex]
The balanced reaction of radioactive decay of phosphorous shows conservation of mass.
Thus, in order to satisfy charge conservation and lepton number conservation the other products must be neutron.
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I need this now for a test
explain why the dust clouds that moved to the east coast of the united states during the 1934 storm were composed mostly of silt and clay particles
instead of sand
Dust clouds that moved to the east coast of the united states were composed mostly of silt and clay particles due to constant ploughing during drought.
What is Drought?This is defined as dry period in the climate due to insufficient rainfall in the area at a given time.
The drought led to the soil being constantly ploughed thereby loosening and changing the soil type which is susceptible to wind erosion.
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Calculate the number of joules released when 75.0 grams of water are cooled from
100.0°C to 27.5°C
Answer:
-22750.5J or -2.28× 10⁴J
Explanation:
q=(75.0g)(4.184J)(27.5°C-100.0°C)
q= -22750.5J
q= -2.28× 10⁴J
WILL GIVE BRAINLIEST
If an element is in period 6, what is the highest possible number of electrons that can be in that atom?
d. What is being done to save this species
e. An organization/group that is working towards
Create a commercial that showcases why we should save the manta rays
a. Commercials should be about 30seconds-1 minute. No longer than 30
Answer:
answer
Explanation:
I think it's e hope it right
formation of water: 2H2 + 1 O2 --> 2H20
How many moles of O2 will I need to produce 15 moles of H2O?
Answer don’t delete comment or I’ll report
Answer:
n=15 moles H2O
1:2
x:15
x=7.5 moles of O2
PLEASE HELP DUE IN 10 MINUTES In your own words, how does photosynthesis work?
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil
If the molar mass of aluminum chloride was actually 400 g/mol, what would the molecular formula of aluminum chloride be?
Answer:
3AlCl₃
Explanation:
molar mass of aluminum chloride AlCl₃ is 133.33 g/mole
133.33 times 3 is 400
put 3 in front of AlCl₃
3AlCl₃
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how many grams of KNO3 can be dissolved in 100g of water at 80c
Answer:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
Explanation:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
why might it be unwise to drink water straight from a pond
Answer:
it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well
Explanation:
____ are designed to make necessary adjustments to place a satellite into stable orbit.
there an A B C D thing?
Explanation:
890
Answer: thrusters
Explanation: got it right
Water has a specific heat of 4.184 J/goC. Copper metal has a specific heat of 0.385 J/goC. What can be said about the amount of heat needed to raise both substances 1 degree Celsius. (In other words, which one will take more heat to raise 1 degree.)
It can be said that water will take more heat to raise its temperature by 1°C than copper. Details about specific heat can be found below.
What is specific heat capacity?Specific heat capacity of a substance can be defined as the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K or 1 °C.
According to this question, water has a specific heat of 4.184 J/g°C while Copper metal has a specific heat of 0.385 J/g°C. This shows that water has a higher specific heat.
Therefore, it can be said that water will take more heat to raise its temperature by 1°C than copper metal.
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A semiconductor:
A.
always allows charge to flow.
B.
never allows charge to flow.
C.
cannot be used at normal temperatures.
D.
has characteristics between conductors and insulators.
Answer:
D. has characteristics between conductor and insulator
The lewis electron dot system represents electrons in the--
a) outer energy level
b) inner level
c) core level
d) middle level
Answer:
the correct answer is a. the lewis structure represents only the outer energy level
Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
Answer:
a. because it is an element
Explanation:
its pure because it only has one type of atom, making it an element
How many oxygen atoms are in one mole of carbon dioxide
Answer:
abt 2 moles
Explanation:
1 mole of carbon atoms per mole of carbon dioxide = 6.02 x 1023 carbon atoms. 2 mole of oxygen atoms per mole of oxygen atoms = 2 x 6.02 x 1023 oxygen atoms.