Answer:
4.47 x 10²² atoms
Explanation:
Given parameters:
Mass of Bismuth = 15.5g
Unknown:
Number of atoms = ?
Solution:
To find the number atoms, first solve for the number of moles in this element first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{15.5}{209}[/tex] = 0.074mole
So:
1 mole of a substance contains 6.02 x 10²³ atoms
0.074 mole of Bismuth will contain 0.074 x 6.02 x 10²³ atoms
= 4.47 x 10²² atoms
Question and answer options are on the PICTURE please help :(
Answer:
The sun
Explanation:
Because plants use sunlight to conduct photosynthesis which is the process the need to create energy
acid+base->salt+water
What type of reaction is this?
Answer:
The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.
Answer:
Neutralization reaction
Explanation:
Neutralization reaction it the reaction of acids and bases that form salt and water
hope it's helpful ❤❤❤❤
THANK YOU.
What would be the most likely explanation if none of the tested paint samples had turned brown?
1. The reaction was not actually caused by UV light.
2. The reaction only happens in real sunlight, not artificial.
3. The paint behaves differently on a canvas than it does in a laboratory.
4. None of the tested mixtures matched the chemical composition of Van Goghs paint.
Answer:4/d
Explanation:
i did this before
Questions and answer options are on ( Picture )
remember pick 2 answers it says
help :(
ZOOM IN if needed
Answer:
The answer is A
Explanation:
I dont see any claim
Calculate the vapor pressure (in torr) of a 35°C solution of ethanol and propanol where the mole fraction of propanol is .75.
Assume ideal behavior.
P°ethanol = 100 torr
P°propanol = 36 torr
Answer:
i wish i know
Explanation:
Give 2 reasons why is copper used for electrial wires
Answer:
Copper electrical wires are safer to use than wires made of most other conductive metals because they are resistant to heat. As you can see, copper is the preferred metal for electrical wires for several reasons. It has high electrical conductive; it's inexpensive; it's ductile; and it's thermal resistant.
Hey can someone please help me with this
Answer:
This is not a redox reaction.
Explanation:
A redox reaction is a reaction that involves reduction and oxidation processes. The best way to identify a redox reaction. Changes in the oxidation number f the species indicates that it is a redox reaction.
Na+
Reactant side = +1, Product Side = +1; No change
Cl-
Reactant side = -1, Product Side = -1; No change
Ag+
Reactant side = +1, Product Side = +1; No change
N
Reactant side = +5, Product Side = +5; No change
O
Reactant side = -2, Product Side = -2; No change
There is no change in any of the oxidation numbers, Hence this is not a redox reaction.
what is the answer PLEASE HELP!!
Answer:
the water displaced will not help the student find the correct volume because you can not accurately calculate it. you have to get the water when it is settled then you place the wood in.
Explanation:
Which formula represents a
polar molecule
containing polar covalent bonds?
A. H2O
B. CO2
C. NaCL
D. Cl2
Answer:
A. H2O
Explanation:
Let us first define the three types of bonds:
1. Nonpolar Covalent: electronegativity difference < 0.4
2. Polar Covalent: electronegativity difference between 0.4 and 1.8
3. Ionic: electronegativity difference > 1.8
This will help us eliminate choices C and D:
-NaCl has a electronegativity difference of 3.0 - 0.9 = 2.1 (ionic bond)
-Cl2 has a electronegativity difference of 3.0 - 3.0 = 0 (nonpolar covalent bond)
However, we still have two more options, A and B, but they are not diatomic for us to use the electronegativity differences with.
We must now consult their geometries. Because CO2 has a linear geometry (O=C=O), the two sides will cancel each other out, resulting in a nonpolar covalent bond. At this point, by process of elimination, we can already determine the answer to be A. H2O. We can verify this by looking at the geometry of H2O, which is bent (H-O-H; imagine the O is above the H's, I cannot draw it in this response). H2O's bent geometry classifies it as polar covalent; the electrons are slightly more attracted towards the O, the more electronegative element. Side note: this makes the O slightly more negative in charge, whilst the H's are slightly more positive in charge.
P.S. I apologize for not being able to draw and demonstrate that last paragraph, but I hope you get a general idea. You can search up the "H2O geometry" and "CO2 geometry" to get a better idea! :)
H₂O represents a nonpolar molecule containing polar covalent bonds. Hence Option (A) is correct
What is Polar Covalent Bond ?A polar covalent bond exists when atoms with different electronegativities share electrons in a covalent bond.
Consider the hydrogen chloride (HCl) molecule. Each atom in HCl requires one more electron to form an inert gas electron configuration.
Water (H₂O), like hydrogen Chloride (HCl), is a polar covalent molecule. When we look at a diagram of water , we can see that the two hydrogen atoms are not evenly distributed around the oxygen atom
Water (H₂O) is polar because of the bent shape of the molecule. The shape means most of the negative charge from the oxygen on side of the molecule and the positive charge of the hydrogen atoms is on the other side of the molecule.Thus, This is an example of polar covalent chemical bonding.
Therefore, H₂O represents a nonpolar molecule containing polar covalent bonds. Hence Option (A) is correct
Learn more about bonding here :
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Electrical energy is the amount of energy that an object contains due to kinetic energy
Answer:
The energy an object has due to its motion is called kinetic energy. Factors Affecting Kinetic Energy: the kinetic energy of an object depends on both its speed and its mass. The faster an object moves, the more kinetic energy it has.
Explanation:
Scott and his classmates were looking at an animal cell under a microscope. They are trying to locate the cell's DNA, which is found in its chromosomes. Where should Scott look to find the chromosomes?
In the mitochondria
In the cell nucleus
In the cytoplasm
In the cell vacuole
A student increases the temperature of a 300 cm3 balloon from 40 °C to 110 °C.
What will the new volume of the balloon be? Round your answer to one decimal point.
(To convert, add 273.15)
Will Mark brainliest!!!
Answer:
367.1 cm³
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 300 cm³
Initial temperature (T₁) = 40 °C
Final temperature (T₂) = 110 °C
Final volume (V₂) =?
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273.15
Initial temperature (T₁) = 40 °C
Initial temperature (T₁) = 40 °C + 273.15
Initial temperature (T₁) = 313.15 K
Final temperature (T₂) = 110 °C
Final temperature (T₂) = 110 °C + 273.15
Final temperature (T₂) = 383.15 K
Finally, we shall determine the final volume (i.e the new volume) of the balloon. This can be obtained by using the Charles' law equation as illustrated below:
Initial volume (V₁) = 300 cm³
Initial temperature (T₁) = 313.15 K
Final temperature (T₂) = 383.15 K
Final volume (V₂) =?
V₁/T₁ = V₂/T₂
300 / 313.15 = V₂ / 383.15
Cross multiply
313.15 × V₂ = 300 × 383.15
313.15 × V₂ = 114945
Divide both side by 313.15
V₂ = 114945 / 313.15
V₂ = 367.1 cm³
Therefore, the new volume of the balloon is 367.1 cm³
Using the balanced chemical equation:
4NH3 + 302 --> 2N2 + 6H20
Determine the amount of grams of N2 is produced If 4.03 moles of NH3 react?
Taking into account the reaction stoichiometry, 56.42 grams of N₂ are formed when 4 moles of NH₃ react.
Reaction stoichiometryIn first place, the balanced reaction is:
4 NH₃ + 3 O₂ → 2 N₂+ 6 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
NH₃: 4 molesO₂: 3 molesN₂: 2 molesH₂O: 6 molesThe molar mass of the compounds is:
NH₃: 17 g/moleO₂: 32 g/moleN₂: 28 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
NH₃: 4 moles ×17 g/mole= 68 gramsO₂: 3 moles ×32 g/mole= 96 gramsN₂: 2 moles ×28 g/mole= 56 gramsH₂O: 6 moles ×18 g/mole= 108 gramsMass of N₂ formedThe following rule of three can be applied: if by reaction stoichiometry 4 moles of NH₃ form 56 grams of N₂, 4.03 moles of NH₃ form how much mass of N₂?
[tex]mass of N_{2} =\frac{4.03 moles NH_{3} x56 grams of N_{2} }{4 moles NH_{3}}[/tex]
mass of N₂= 56.42 grams
Then, 56.42 grams of N₂ are formed when 4 moles of NH₃ react.
Learn more about the reaction stoichiometry:
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Microgravity is a condition where an object or person can appear to be weightless. true or false
Answer:
its true
Explanation:
Cause i know because i just have notes a lot and i am in 10th grade U w U
How did modern scientists experiment with Van Gogh's paints to determine their chemical reactions?
1. They used X-ray analysis.
2. They used litmus testing.
3. They burned the paint to examine what elements were left after the chromium was burned off.
4. They studied the density of modern yellow paint to that of 100-year-old paint.
Answer:
I think the answer is A - they used X-ray analysis.
Explanation:
Answer:They used X-ray analysis
Explanation:
It’s in the text
PLEASE HELP
which of the following has the smallest ionic radii?
1. K
2.Na
3.Ca
4.Mg
Answer:
sodium, Na
Explanation:
Na, is the smallest with atomic number 11 and it has one valence electron
Helppp me plzzzzz!!!
Answer:
they use echos to communicate
Explanation: dolphins make echos in order to signal there partners, and others in there pod. or they can use it to signal for prey, or signal that they are in trouble.
Answer: A good example for this one is bats.
Explanation: While a couple of bats are known to emanate the beats through their nose, most bats will in general express them. The recurrence is estimated to be around 200 heartbeats each second, nonetheless, the time frame can fluctuate with the types of a bat. Credits: Adi Ciurea/Shutterstock A bat's squeaks are more rewarding than Ben's on the grounds that with higher recurrence comes higher-goal or more distinctive detail – they are equipped for evading deterrents no more extensive than a human hair! They use it to find and explore towards prey, for example, a hurrying bug. As the distinguished sound waves that structure the pictures are basically echoes, they should adjust to a standard — the recovered train of heartbeats should be sufficiently noisy to get back to the sender, yet short sufficient with the end goal that the reverberation of the sender returns before the following one withdraw.
What is the total magnification if we using objective lens 4x and our eyepiece (ocular) lens is 10x
40x
100x
400x
1000x
sodium hydrogen carbonate is heated after heating which substance is form??? and what is the colour of the substance
What is the oxidation number for Cl?
2
+1
-1
+2.
Answer:
-1
Explanation:
which of these is the smallest particle
Answer:
atom
Explanation:
A compound is atoms combined (or something combined) and a speck of dust is visible unlike the other two
Answer:
Atom
Explanation:
It would be the atom
A doctor prescribes 125 mg of penicillan to be taken 4 times each day. The
concentration of the solution given to the patient is 250mg penicillan/5ml. How
many mL should the patient take in each dose?
1) 500 mL
2) 10.0 mL
3) 2.50mL
4) 50.0 mL
5) 2.0 mL
10 ml should the patient take in each dose
Further explanationGiven
125 mg of penicillan ⇒ 4 times/day
The concentration = 250 mg/5 ml
Required
The volume of the dose
Solution
The mass of penicillan/day :
= 125 mg x 4 times
= 500 mg
The volume/day :
= 500 mg : 250 mg/5 ml
= 10 ml
3. When two atoms are combined what do they make?
Answer:
When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element. For example, when three oxygen atoms bond together, they form a molecule of ozone (O3). If a molecule forms from atoms of two or more different elements, we call it a compound.
Explanation:
PLEASE MARK ME AS BRAINLIEST
CAN SOMEONE PLZ HELP ME ON THIS
Answer:
Q1. C
Q2.ring number 1 is 2
ring number 2 is 8 and
ring number 3 is 18
Q3. p can contain 6 electrons max
and d can contain 10 electrons max
Q4. D
how does plants react with no scratch?
Answer:
You see, plants need energy to grow and grow and grow. They use energy from sunlight to make a simple sugar, glucose. Whenever the plant needs energy, it can chomp a little glucose off of the starch.
without energy it wont get energy/food so it will eventually die
Explanation:
What valence electron number do they all have in common
What type of chemical reaction is the following reaction:
carbon monoxide and oxygen yield carbon dioxide
Answer:
decomposition reaction
Carbon Tetrahydride reacts with Oxygen gas to form Carbon Dioxide gas and Dihydrogen Monoxide gas.
Explanation:
How many moles of ammonia gas are produced from 3.6 moles of hydrogen gas and excess nitrogen gas?
Answer:
If so, the limiting reagent of Nitrogen would allow 16 moles of Ammonia to be produced.
Explanation:
23.When an atom absorbs energy
a.One or more electrons will move to a higher energy orbit
b.One or more electrons will move to a lower energy orbit
c.Colored light is produced
d.There is an explosion
Answer:
a.One or more electrons will move to a higher energy orbit
Explanation:
Absorbing energy means that the electron gets excited and jumps to a higher level.
Highlight the examples of radiation in the passage
below.
A chemist working in the laboratory is
investigating the thermal energy of H2O in a
solid, liquid, and gas state. First, she places
ice in a pan on a burner and heats it. She
records the temperature at which the solid ice
melts. Next she takes the liquid water and
heats it in a microwave. The liquid begins to
bubble and evaporate into a gas. She records
the temperature at which the liquid water
turned into a gas.
Answer:
Heating of the liquid water in a microwave.
Explanation:
Radiation is a form of heat transfer process that does not require a material medium rather it travels through space or vacuum in the form of electromagnetic waves or radiation. Heat transfer by radiation occurs in the form of microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. Some common examples of heat transfer by radiation is the warming of the Earth by the Sun, the warmth one experiences while sitting by the campfire, or the heating up of foods in a microwave.
Black bodies or surfaces are good absorbers as well as emitters of radiation. On the other shiny or white surfaces are poor radiators of heat.
From the above discussion on radiation, it can be seen that when the chemist takes the liquid and heats it in a microwave, the heat absorbed by the liquid to change to gaseous state is transferred through radiation.
