Please answer, please answer please answer please answer
my last 2 chemistry question.
Answer:
1. filtration and evaporation
2. i) water is added to the sand and salt mixture
ii) then the mixture is filtrated and so the sand and the salt water was seperated
iii) the salt water is heated with the help of burner until the water gets evaporated
iv) after the water gets evaporated, the salt is remained in the container
3. observation:
on adding water to the mixture, the salt is completely dissolved in the waterwhen filtrated the sand is seperated from the salt waternow the salt water when heated with the burner until the evaporation, the water is evaporatedthe salt is precipitated and remained in the container4. cautions:
while using the burner, we should be cautious with firethe container that is heated should be holded with the help of a cloth to avoid heatHow many grams of Phosphorus is required to complete combustion of 40g Oxygen P+O2-mm>P2O5 . Please balance
Answer:
Mass = 31 g
Explanation:
Given data:
Mass of phosphorus required = ?
Mass of oxygen = 40 g
Solution:
Chemical equation:
4P + 5O₂ → 2P₂O₅
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 40 g/ 32 g/mol
Number of moles = 1.25 mol
Now we will compare the moles of P and oxygen.
O₂ : P
5 : 4
1.25 : 4/5×1.25 = 1
Mass of phosphorus:
Mass = number of moles × molar mass
Mass = 1 mol × 31 g/mol
Mass = 31 g
which compound is made from metals and non metals
During witch process dose carbon dioxde gas move from the atmosphere
Answer: it is density
Explanation:
Please help me solve this USING DIMENSIONAL ANALYSIS! :
Get yourself a snack. Read the nutrition label. How many calories are in the snack? Now convert this into the international unit of energy, the Kilojoule.
How many kJ are in your snack?
1 dietary Calorie = 1000 calories (the dietary Calorie, with a capital C, is what is listed on your nutrition label. This is different than a lower-case c "calorie.")
1 calorie = 4.184 Joules
Complete this sentence: In my ___________, there are _______kJ of energy.
Answer:
Explanation:
Given: 1 dietary Calorie = 1000 calories
1 calorie = 4.184 Joules
But,
1 dietary Calorie = 1 Kcalorie
= 1000 x 4.184 Joules
= 4184 Joules
= 4.184 KJoules
1 dietary Calories contains 4.184 KJ of energy.
A bottle of Coca cola contains 42 Kcalories; thus,
1 Kcalorie = 1000 calories
= 4.184 KJoules
Energy = 42 x 1 dietary Calories
= 42 x 4.184 KJoules
= 175.728 KJoules
Energy ≅ 176 KJ
So that;
In my bottle of coca cola, there are 176 KJ of energy.
Which part of the electromagnetic spectrum has a lower frequency than visible light?
gamma rays
x-rays
infrared
ultraviolet
Answer:
Infrared Radiation
Explanation:
Infrared Radiation
The range of infrared frequencies extends up to the lower limit of visible light, just below red.
The answer is infrared.
How many unpaired electrons are present in the ground state of the atoms in Group 4A(14)?
unpaired electrons
Answer:
the correct answer is 2
Explanation:
i just did this assignment :)
There will be 2 unpaired electrons in p orbital of unpaired electrons present in the ground state of the atoms in Group 4A(14).
What are unpaired electrons?The unpaired electrons are those which do not have any pair due to absence of no more electrons and they are highly unstable elements if the electrons are not paired in the orbitals.
There are 4 types of orbitals s, p, d, and f s-orbital consist of one pair of electrons to fill and the p-orbital have 3 blocks which can be filled with 3 pair that is 6 electrons after filling, and two unpaired electrons left in p-orbital.
Therefore, in the ground state of the atoms in Group 4A(14) 2 unpaired electrons in the p orbital of unpaired electrons are present.
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Hii please answer this really easy x
Answer:
What do we need to find in that question ?
Answer:
1) no
2)yes
3)no
4)yes
Explanation:
hope that it helped you
this was wrong!! plz answer asap! i cant get this wrong :/
Why can't anything cheer me up rn?...
:'(
not sure.. you should eat poptarts
Answer:
well if u need some one i'm here
Explanation:
...
How many possible values are there for the quantity "c", considering a specific chemical reaction represented by the equation aA+bB--> cC +dD, in this equation the letters A,B,C and D represent chemicals, and the letters a,b,c and d represent confessions in the balanced equation.
Answer:
There is only one possible value for the quantity "c"
Explanation:
There is only one possible value for the quantity "c". This is because the a,b,c and d represent number of moles in he balanced equation. And since the number of moles of a particular substance (atom or compound) in a balanced equation must be distinct, it (the substance) can only have one value. For example, consider the equation below
2C₂H₂ + 5O₂ ⇒ 4CO₂ + 2H₂O
It can be seen from the above equation that the individual number of moles are distinct and have just one possible value. And if C₂H₂ is A, O₂ is B, CO₂ is C and H₂O is D, then 4 is "c".
Thus, "c" is the number of moles for the substance "C" with just one possible value.
I'll give 40 pts for this one but pls help me....
What is the new volume when the pressure of 20 milliliters of an ideal gas decreases from 202 kPA to 101 kPA?
PLEASE HELP WITH THIS ASAP
This diagram shows a ball rolling from left to right along a frictionless surface. In which sections will the ball be subjected to a balanced force?
A. Sections 2 and 5
B. Sections 2 and 3
C. Sections 1 and 4
D. Sections 2, 3, and 5
In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.
What is the frictionless surface?A Frictionless surface refers to that kind of surface where the force acting on any object which makes it difficult for the object to slide is almost zero or negligible, i.e., no resistance between surface or substance allowing the object to slide and move freely without any friction.
In sections 1 and 4 the ball is subjected to a balanced force. Hence, option C is correct.
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Answer:1 and
Explanation:
During an experiment, 456 g of carbon dioxide is produced. What is the mass of carbon dioxide in kg?
Answer:
0.456
Explanation:
Carbon Dioxide, CO2 0.456
456÷1000=0.456
calculate the number of moles of nitrogen gas present in 400cm3 sample of it a pressure of 790 mmHg and 27°C.
Answer:
0.02 mol
Explanation:
Given data:
Number of moles of nitrogen = ?
Volume of sample = 400 cm³
Pressure = 790 mmHg
Temperature = 27°C
Solution:
Volume of sample = 400 cm³ (400/1000=0.4 L)
Pressure = 790 mmHg (790/760 = 1.04 atm)
Temperature = 27°C (27+273=300 K)
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1.04 atm ×0.4 L = n× 0.0821 atm.L/ mol.K ×300 K
0.416 atm.L = n× 24.63 atm.L/ mol
n = 0.416 atm.L /24.63 atm.L/ mol
n = 0.02 mol
Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. Is a chemical reaction taking place? How do you know? Please help this is due in 2 hours
Answer:
Test for carbon dioxide gas.
Explanation:
The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!
PLEASE GIVE BRAINLIEST
On mixing citric acid and baking soda a chemical reaction takes place which is indicated by the evolution of carbon dioxide gas .
What is a chemical reaction?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction, there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Which statement BEST explains whether or not matter is conserved in this chemical reaction? A Matter is being conserved because there is an equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. B Matter is not being conserved because there are more atoms of oxygen in the reactants than there are in the products, so there is also more mass in the reactants than there is in the products. C Matter is being conserved because carbon, hydrogen, and oxygen are found in the reactants and in the products in different arrangements, and the mass of the reactants is equal to the mass of the products. D Matter is not being conserved because there are 11 units in the reactants, one C8H8 and 10 O2, and 12 units in the products, eight CO2 and four H2O, so there is also more mass in the products that in the reactants.
Answer:
D
Explanation:
The matter is being conserved because the equal number of atoms of each element in the reactants and products, and the total mass of the reactants is equal to the total mass of the products. Therefore, option (A) is correct.
What is the law of conservation of matter?One or more initial substances change into different substances in any chemical change. Both the initial and final substances are made up of atoms as all matter is made up of atoms.
According to the law of conservation of matter, matter can neither be created nor destroyed, we just can convert it from one form to another. So the same number and kind of atoms before and after the chemical change are present.
According to this law, the total mass of the reactants in a chemical reaction must be equal to the total mass of products for a low-energy thermodynamic process.
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The energy required to remove an electron from a neutral atom is known as its:
Answer:
Ionization energy
Explanation:
how many joules are needed to warm 25.5 grams of water from 14.0°C to 22.5°C? the heat capacity of liquid water is 4.184J/g°C
Answer:
Q = 906.882 J
Explanation:
Given data:
Mass of water = 25.5 g
Initial temperature = 14.0 °C
Final temperature = 22.5 °C
Specific heat capacity of water = 4.184 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 22.5 °C - 14.0 °C
ΔT = 8.5 °C
Q = 25.5 g × 4.184 J/g.°C × 8.5 °C
Q = 906.882 J
Use the Periodic Table to find molar mass of water. Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation: NaOH + HCl → NaCl + H2O What mass of water forms when 2.75 × 10–4 mol NaOH reacts completely? 2.75 × 10–4 mol NaOH = g H2O
Answer:
0.00496
Explanation:
Answer on EDG 2020
Answer:
the answer is 0.00496
Explanation:
2.75 x 10-4 mol NaOH = 0.00496 g H20
the second part is A.
FOR EDG 2020
A change in temperature causes a change in density. \
True False
Answer:
it will be true
Explanation:
What is a solution?
Answer
there are to answers one is an answer to a problem or a mixture of chemicals
Explanation:
Answer:
a liquid mixture in which the solute is uniformly distributed within the solvent.
Explanation:
The _____ variable is the change you are observing and that changes in response to the _____ variable.
Answer:
Independent variable, dependent variable
Explanation:
Answer:
Dependent variable, independent variable
Explanation:
The dependent variable DEPENDS on the independent variable.
Which is Chemical Equation is Balanced?
CH, +0,------CO,+2H2O
4A1+30,-----2A1,0,
H2+O2-----2H,0
Z forms chloride compounds with the formulae ZCl2 and ZC13.
ZCl2 is a pale green solid and ZC13 is a brown solid.
Based on the given information, which are true about element Z?
I Element Z has high melting point.
II Element Z can form complex ion.
III Element Z has more than one oxidation number.
IV Element Z is a metalloid.
A I, III
B II, IV
C I, II, III
D I, II, III, IV
Answer:
(B) II, IV.
hope this answer is helpful for u.
10. Haley the hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
What is her speed?
Answer:
4
Explanation:
Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.
The speed of Haley the hummingbird is 4 m/s.
From the question,
We are to calculate the speed of Haley the hummingbird
Speed is given by the formula
[tex]Speed =\frac{Distance\ traveled}{Time\ taken}[/tex]
From the given information,
The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.
That is,
The bird can cover a distance of 20 meters in 5 seconds.
Therefore,
Speed of the hummingbird = [tex]\frac{20}{5}[/tex]
Speed of the hummingbird = 4 m/s
Hence, the speed of Haley the hummingbird is 4 m/s.
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Determine the frequency of light with a wavelength of 4.50 x 10-7 m.
Answer:
f = 0.67×10¹⁵ s⁻¹
Explanation:
Given data:
Frequency of light = ?
Wavelength = 4.50 ×10⁻⁷ m
Solution:
Formula:
Speed of light = wavelength × frequency
Speed of light = 3×10⁸ m/s
Now we will put the values in formula.
3×10⁸ m/s = 4.50 ×10⁻⁷ m × f
f = 3×10⁸ m/s / 4.50 ×10⁻⁷ m
f = 0.67×10¹⁵ s⁻¹
What happens to the luminosity of stars in the main sequence as temperature decreases
PERIODIC TABLE LOVERS HELP ME WITH THIS AND ILL PUT U ON BRAINLIEST !
Answer:
an educated guess of f and i
Explanation: