What is a flame test used for?
A. To identify an unknown sample by its emission spectrum
B. To determine the ionization energies of electrons
C. To remove impurities from a sample through burning
D. To identify an unknown sample by its melting point
The flame test used for to identify an unknown sample by its emission spectrum
What is the purpose of a flame test?A metal or metalloid ion discovered in an ionic compound can be identified, or at least its potential identification, using the flame test, a qualitative chemical test. It's possible for the compound to emit a distinctive colour that may be seen with the unaided eye if it's placed in a gas burner's flame. To determine whether metal and metalloid ions are present in the sample, chemists employ a qualitative examination known as a flame test. The metal ions heated in the gas burner don't all produce colour. The quickest and most straightforward method for determining whether group 1 metal ions are present in the chemical is a flame test. A wire or wooden splint is dipped into a sample solution or coated with the substance to be tested.To learn more about flame test refers to:
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Answer: to identify an unknown sample by its emission spectrum
Explanation:
What are the similarities and differences between ionic and covalent bonds?
Answer:
Explanation:
Similarities.
Both Ionic and covalents bond produce exothermic reactions.
They are both neutral.in Ionic bonds, the two opposite charge will terminate each other and in covalent, the neutral molecules tend to share electrons.
Difference
Ionic bonds have high polarity while covalent have low.
Ionic bonds have no definite shape, covalent have.
Ionic have high melting points, covalent have low.
Io ic have high boiling point, covalents have low.
if 71.1 moles of CO2 react with H2, how many moles of H2O are produced
Answer:
71.1 mol CO2 ( 1 mol CH4 / 1 mol CO2 ) = 71.1 mol CH4 produced
Explanation:
Answer:
142.2 mol H2O
Explanation:
The chemical reaction is
4H2 + CO2 ---> CH4 + 2H2O
71.1 mol CO2 × (2 mol H2O / 1 mol CO2)
= 142.2 mol CO2
Which statement about the elements in Group 0 is correct?
Tick () one box.
A. All elements in the group are very reactive.
B. All elements in the group form negative ions.
C. The boiling points increase down the group.
D. The relative atomic masses (Ar) decrease down the group.
The boiling points increase down the group.Thus, option C is the answer.
Group 0, also known as the noble gases, is a group of chemical elements in the periodic table. These elements are all characterized by having a full valence shell of electrons, which gives them little tendency to gain or lose electrons and makes them generally unreactive. As a result, the elements in Group 0 are not very reactive and do not form many compounds.
The boiling points of the elements in Group 0 generally increase as you go down the group. This trend is due to the increasing atomic radius of the elements as you go down the group. The larger the atomic radius, the more space there is between the atoms in a substance, and the more energy is required to overcome the attractive forces between the atoms. This results in a higher boiling point.
In contrast, the relative atomic masses (Ar) of the elements in Group 0 generally decrease as you go down the group. This is because the atomic radius increases as you go down the group, but the number of protons in the nucleus (and therefore the atomic mass) does not change significantly. As a result, the relative atomic mass decreases as the atomic radius increases.
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Which reaction results in the GREATEST increase in entropy?
A)
(diamond)— Сgraphite)
B)
CO2(s) — CO2(g)
C)
H2O(s) — H20(5)
D)
2H2(g) + O2(g) → 2H2O(1)
Cells grouped together to make a specific part of the body of a plant or animal are called:
A. an organism
B. photosynthesis
C. a tissue
I will give brainliest
Fill in the blank using the word the same as or different than.
Other planets, such as Mars and Jupiter, have year-lengths that are ___________________________________
the length of a year on Earth.
Answer:
Different because it depends how long the planets take a single orbit around the sun. :) Hope this helps
Explanation:
Other planets, such as Mars and Jupiter, have year-lengths that are different than the length of a year on Earth.
What is a planet?A planet can be defined as a large astronomical (celestial) body that has sufficient mass to allow for self-gravity and make it assume a nearly circular shape, which is known as hydrostatic equilibrium.
Based on astronomical records, a planet revolves in its orbit around the Sun in the solar system and as such, a planet which is closest to the Sun would travel the fastest while experiencing stronger gravitational pull.
In this context, other planets, such as Mars and Jupiter, have year-lengths that are different than the length of a year on Earth because of the difference in time to perform a single orbit around the Sun.
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A relationship that decreases the dependent variable when the independent variable increases is called __________________
molecule of the variables shift in the opposite directions when there is a inverse or negative relationship. In other words, the dependent variable grows if the value of the independent variable falls.
What is the name of the correlation here between dependent and independent variables?The dependent variable in this study are often the effect and the variable are the cause in a research investigation. Additionally, one could say that there is a cause-and- effect link between the independent and the dependent variables.
What kind of link does there exist between these two variables?A statistical method known as correlation is used to quantify and explain a link between two variables. The two factors are often just observed, not changed. Two scores from identical people must be used for the correlation
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How many of each type of atom should react so that the electrons
lost will equal the electrons gained?
Explanation:
ni suna ham naHow many of each type of atom should react so that the electrons
lost will equal the electrons gained?
how many moles of Hcl can be produced from 1.21 moles of zn?
Answer:
2 moles
Explanation:
What is the formula for calculating kinetic energy?
KE= 1/2mv²
KE=2mv²
KE=1/2m²v
KE=2m²v
Answer:
The formula for kinetic energy is KE= 1/2mv²
Explanation:
Hope it helps you
PLS RATE AS BRAINLIEST ANSWER
An atom of carbon and an atom of element Z together have a mass of 6 amu less than double
the mass of an atom of oxygen. If an atom of oxygen has a mass of 16 amu and the mass of an
atom of carbon is 12 amu, what is the mass of an atom of element Z?
The mass of an atom of element Z is 4 amu. This can be determined by subtracting the mass of an atom of carbon (12 amu) and an atom of oxygen (16 amu) from double the mass of an atom of oxygen (32 amu). 32 amu - 12 amu - 16 amu = 4 amu.
What is atom of carbon?An atom of carbon is a basic building block of all organic materials. It is the 6th element in the periodic table and has an atomic number of 6. Carbon atoms have 6 protons and 6 neutrons, and have a valence of 4. This means that carbon atoms can form four bonds with other atoms. Carbon is the basis of all life on Earth, as it is essential for the formation of proteins, fatty acids, and other molecules necessary for life. Carbon atoms have the ability to form a wide variety of molecules with different properties, which makes them highly versatile and important in many different fields, such as medicine and engineering. Carbon is a non-metal, but can behave like a metal in certain circumstances. It is also the basis of the fossil fuels that power our society.
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Please help!!
See attachment
In KClO3, the proportions of K, Cl, and O are 31.9%, 28.9%, and 39.1%, respectively.
KClO3: Is it an acid or a base?There are three ways to define bases and acids. A strong base and a strong acid, respectively, called KOH K O H and HClO3 H C l O 3, react to form KClO3 K C l O 3, a salt.
Who or what is KClO3?A powerful oxidising agent with several applications is potassium chlorate (KClO3). It is or has formerly been a part of fireworks, explosives, safety matches, and disinfectants. The disproportionation of sodium hypochlorite results in the formation of sodium chloride and sodium chlorate initially.
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This is Yolanda's desk. What could Yolanda do to increase the amount of force needed to move the desk?
Answer:
The last one.
Explanation:
The other ones add more force or give the same but the last one reduces it.
True or false stars will eventually burn out causing the universe become cold and dark
waves in a lake are 5.00m in length and pass an anchored boat 1.25 s apart. the speed of the waves is:
a. 0.25 m/s
b. 4.00 m/s
C. 6.25 m/s
d. 3 × 108 m/s
Answer:
b. 4.00 m/s
Explanation:
divide the waves by the time
5÷1.25=4
What problems did Haber face? Think about equilibrium!
In your
explanation include the words nitrogen, hydrogen, ammonia, equilibrium, and
pressure.
Calculate the mass of compound (molar mass = 256 g [tex] mol {}^{-1} [/tex] ) to be dissolved in 75g of benzene to lower its freezing point by 0.48K
( [tex]K _{f} = 5.12 \: K \: \: kg \: mol { }^{ - 1} [/tex] )
thankyou.
The mass of the compound is calculated by freezing point depression formula which is ΔTf=Kf×W₂×1000/M₂×W₁ which is equal to 3125 g.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.
Freezing point depression is calculated by the formula, ΔTf=Kf×W₂×1000/M₂×W₁ .Therefore,W₁=5.12×75×1000/0.48×256=3125 g.
Thus, mass of compound is 3125 g.
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Is this line real or imaginary?
Answer:
imaginary because i see no line.
Explanation:
These steps are followed when using the half-life of carbon-14 to determine
the age of an object that contains carbon. What is the correct order of these
steps?
A. Use the half-life of carbon-14 to determine the number of half-lives
that have passed.
B. Use the number of half-lives that have passed to determine the age
of the object.
C. Measure the ratio of parent and daughter nuclei.
A. B, C, A
B. C, A, B
O C. A,B,C
OD. A,C,B.
Answer:
B. C, A, B
Explanation:
We can measure the age of an artifact by comparison of the activities a living sample with that of the artifact. This is so because the activity of the living sample represents the original activity of the artifact.
So, the steps involved in determining the age of an artifact is to measure the ratio of the parent and daughter nuclei. Then we use the half life of carbon to find out how many half lives have passed. Using this number of half lives that has passed, we can compute the age of the object.
Answer: B.A.C
Explanation:
Using the balanced equation
how many
3Ba+Al2(SO4)3-->2Al+3BaSO4,
grams of aluminum will be produced if 1.0 g of Ba react with 1.80 g of
Al2(SO4)3?
O.14
0.26
0.28
O.13
Grams of aluminum that will be produced if 1.0 g of Ba react with 1.80 g of Al2(SO4)3 will be 0.28g Al. Hence option c) is correct.
What is balanced equation?A balanced equation is a chemical equation where mass is conserved and there are equal numbers of atoms of each elements on both the sides of equation.
Given, 1.80 g of Al2(SO4)3 and 1.0 g of Ba
So, (1.8 g)/(341.96 g) = 0.00526 moles of Al2(SO4)3
And, 1 mole = 341.96g Al2(SO4)3
Now, (0.00526 moles of Al2(SO4)3)*(2 moles of Al)
= 0.01052 moles of Al
So, (0.01052 moles of Al)*(27 grams of Al)
= 0.28g Al
Hence, option c is correct.
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The current is the same everywhere in a parallel circuit True or false why
How many molecules of copper would be produced by reacting 54.0 grams of copper.
Answer:
48 this answer is wrong so don't
Formula
RnF3+
(2) Lewis dot structure
Formation of RnF₃⁺ will nat takes place easily or if it is form then it will decompose easily.
What is the Lewis dot structure?Lewis dot structure of any compound tells about the bonding and outermost electrons present in all the entities present in that compound.
Radon is a noble gas atom and have stable electronic configuration, but still they form radon flouride products due to the high electronegativity of flourine it attracts the lone pair of electrons of radon.
For the formation of compound promotion of 1, 2 or 3 electrons from the 6p orbital to the vaccant 6d orbitals will give rise to 2, 4 or half filled orbitals so they will form only products with odd number of atoms.
Hence RnF₃⁺ will not form any compound.
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For this assignment, you will make a scale model—a “core sample”—showing the layers of the Earth: crust, lithosphere, asthenosphere, mantle, outer core, and inner core.
The reaction below shows the combustion of propane (C3H8). Why is the mole ratio (3 moles CO2/1 mol C3H8) used to determine the amount of carbon dioxide (CO2) produced when propane (C3H8) combusts in excess oxygen? (1 point) C3H8 + O2 yields CO2 + H2O + heat Propane has a mass that is 3 times greater than that of CO2, so only 1 mole of C3H8 is needed to produce 3 moles of CO2. When the chemical equation for propane combustion is balanced, 1 mole of C3H8 is needed to produce 3 moles of CO2. During combustion, CO2 is approximately 3 times more reactive than C3H8, so less C3H8 will participate in the reaction. Carbon dioxide has a volume of about one-third that of C3H8, so 3 moles of CO2 are needed to react with each mole of C3H8.
One mole of the propane produces three moles of the carbon dioxide from mole ratio.
What is the mole ratio?When we talk about the mole ratio, we mean the ratio of the species that can be found in the reaction. We can be able to get the mole ratio from the balanced reaction equation and we apply it to solve problems from the stoichiometry of the reaction.
Given the fact that we have the reaction as it has been written in the question, it is clear that we would need about one mole of the propane to produce three moles of carbon dioxide.
We can see that there are three atoms of carbon in the propane and the implication of this is that we are going to produce three atoms of carbon dioxide in the product.
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A fluid flowing in a pipe has 1.05 in diameter. If the fluid has density, viscosity and
volumetric flow rate are 62.3 , 1.2 cP and 35 gpm respectively. Calculate: 3
a) The velocity.
b) Reynolds number ()
[2]- Find the following
a) Drive an expression to find a pressure of methane gas at point B b) If the temperature of methane is 100 F, Calculate pressure of
methane gas at point B.
c) Calculate pressure of oil at point C.
PA = 1, 000 psig
[3]- If the water is pumped down one well and the displaced oil which flows up through well exit (see the fig below), drive an expression to find a pressure of inlet water Pw needed to displace oil when the water/oil interfacial tension σ is applied.
Velocity is a vector quantity that describes the rate and direction of an object's motion.
a) The velocity of the fluid:
V = 35 gpm / (π * (1.05 in)^2 / 4) = 7.09 ft/s
b) Reynolds number:
Re = (62.3 lbm/ft^3 * 7.09 ft/s * 1.05 in) / (1.2 cP) = 4,211.9
[2]- a) Expression to find pressure of methane gas at point B:
PB = PA + rgh
b) Pressure of methane gas at point B:
PB = 1,000 psig + (0.072 lbm/ft^3 * 32.2 ft * 0.0689 psia/ft) = 1,233.5 psig
c) Pressure of oil at point C:
PC = PB - 0.433 psia/ft * 32.2 ft = 1,093.3 psig
[3]- Expression to find pressure of inlet water Pw needed to displace oil:
Pw = PC + (σ / r) * (h2 - h1)
Pw = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * (32.2 ft - 0 ft) = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * 32.2 ft.
What is velocity?
Velocity is a vector quantity that describes the rate and direction of an object's motion. It is commonly represented by the symbol 'v' and is measured in meters per second (m/s). Velocity includes both the speed and the direction of the object. For example, if an object is moving north at 10 m/s, its velocity would be 10 m/s north. Velocity can also be determined by taking the derivative of the position function with respect to time.
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What is the molarity of 2.5 moles of NaOH in a 2.6L solution
Answer:
Molarity =Moles of solute/Volume of Solution (L)
Molarity=2.5/2.6
=0.962M
Which is considered a fruit?
acorn
squash
orange
beet
carrot
Answer:
an orange would be considered a fruit
Explanation:
fruits have seeds while vegetables do not
Looking at the web above, each letter represents a species of animal in an ecosystem food web. Which of the following is most likely to cause the greatest decrease in the species B population.
A decrease in species C
A decrease in species E
A decrease in species D
A decrease in species A
Answer:
a decrease in species A is correct answers