The compound which contains an alkaline earth metal and a halogen is CaCl₂.
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.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Determine the frequency and wavelength (in nm) of the light obsorded when the e- goes from n=1 to n=5
Answer:
Frequency = 3.16 ×10¹⁴ Hz
λ = 0.95×10² nm
Explanation:
Energy associated with nth state is,
En = -13.6/n²
For n = 1
E₁ = -13.6 / 1²
E₁ = -13.6/1
E₁ = -13.6 ev
Kinetic energy of electron = -E₁ = 13.6 ev
For n = 5
E₅ = -13.6 / 5²
E₅ = -13.6/25
E₅ = -0.544 ev
Kinetic energy of electron = -E₅ = 0.544 ev
Wavelength of radiation emitted:
E = hc/λ = E₅ - E₁
hc/λ = E₅ - E₁
by putting values,
6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.544ev - (-13.6 ev )
6.63×10⁻³⁴ Js× 3×10⁸m/s / λ = 13.056 ev
λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s /13.056 ev
λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s /13.056 × 1.6×10⁻¹⁹ J
λ = 19.89 ×10⁻²⁶ Jm / 13.056 × 1.6×10⁻¹⁹ J
λ = 19.89 ×10⁻²⁶ Jm / 20.9 ×10⁻¹⁹ J
λ = 0.95×10⁻⁷ m
m to nm:
0.95×10⁻⁷ m ×10⁹nm/1 m
0.95×10² nm
Frequency:
Frequency = speed of electron / wavelength
by putting values,
Frequency = 3×10⁸m/s /0.95×10⁻⁷ m
Frequency = 3.16 ×10¹⁴ s⁻¹
s⁻¹ = Hz
Frequency = 3.16 ×10¹⁴ Hz
Within a group, does the radii of atoms increase or decrease as the atomic
number increases? Explain.
Answer:increase
Explanation: the more electrons there are the bigger the electron field is and the bigger the atomic radii is
A reaction will be spontaneous if the change in Gibbs free energy ____
A. is greater than the entropy
B. None of these
C. is less than 0
D. is greater than 0
Answer:
C. is less than 0
Explanation:
The Gibbs free energy (G) of a system is defined as the energy that is used for the work done. The change in Gibbs free energy during a reaction shows the spontaneity and energetics of the reactions.
A reaction will be spontaneous if the change in Gibbs free energy will be negative or less than 0. Reactions with positive Gibbs free energy are non-spontaneous.
Hence, the correct answer is "C. is less than 0".
What new substance was made after they were mixed
Answer:
In the baking soda and vinegar reaction, the new substances created are carbon dioxide gas, water, and something called sodium acetate. Carbon dioxide gas was inside the bubbles you saw. The detergent did not change in the reaction.
Explanation:
Which element provides strength to bones?
sulfur
phosphorus
nitrogen
hydrogen
Answer:
Phosphorus
Explanation:
Answer:
yup there right
Explanation: :))))
Yo sum help would be sick
Each shape in the chart represents a different type of atom. Atoms with a line (stick) between them show a chemical
bond. Cells A through D tell you whether or not a chemical bond occurs when the atoms combine.
Use the drawing tool to fill in cells A through D in the chart. Show what will happen when the atoms or molecules
combine. Use stick models as necessary.
Answer:
A
Explanation:
Answer:
see photo
Explanation:
PLATO answer
Which one of these is not a pathogen?
a. parasite
b. plant
c. protozoa
d. bacteria
How can you use the VSEPR model to predict the shape of, and the bond angles in a molecule?
Answer:
the VSEPR model utilizes electron-pair geometry (regions around the central atom) and molecular geometry (amount of lone pairs around the central atom–so whatever the electron-pair geometry is, you just count the amount of lone pairs in those regions).
Explanation:
No lone pairs around the central atom, the electron pair and molecular geometry would be the same. Bond angle differs depending on the electron pair geometry and molecular geometry you have for a molecule.
The VSEPR model is used to predict the shape of, and the bond angles in a molecule by counting the number of electron pairs on the valence shell of the central atom in the molecule.
The VSEPR model was introduced by Gillespie and Nyholm in 1957 to explain the shape of and bond angles of molecules.
The main point of the theory is that electron pairs on the valence shell of the central atoms of molecules position themselves as far apart in space as possible to minimize electron pair repulsion.
The number of electron pairs on the valence shell of the central atoms of molecules determine the shape and bond angle of the molecule.
If for instance, there are four electron pairs on the valence shell of the central atom of a molecule, the molecule is expected to be tetrahedral in shape with a bond angle of 109°.
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What is the reaction for CO2+ H2O= H2CO3
Science test I need help for answers answer both
Answer:
The answer to the first question is C. Also im pretty sure the answer to the next problem is C as well
Explanation:
Please help due today
Answer:
1,1,1,1 and yes it does.
Explanation:
6. Which statement is true about scientific debates?
O A. Debates are of no use in science because they do not use scientific evidence.
B. Debates always are able to resolve the problem.
O C. They are a chance for scientists to work out different points of view.
Answer:
C
Explanation:
that's really the only one that makes any sence
PLEASE ANSWER THIS FAST
Upper H Subscript 2 Baseline Upper S Upper O Subscript 4 Baseline (a q) double-headed arrow 2 Upper H Superscript + Baseline (a q) + Upper S Upper O Superscript 2 negative sign Subscript 4 Baseline (a q)
Which contain a common ion that will shift the equilibrium system represented by the equation shown? Select all that apply.
MgSO4
Na2S
HNO3
CaCl2
MgSO₄ and HNO₃ contain a common ion that will shift the equilibrium system. Therefore, option A, C is correct.
What is equilibrium?The equilibrium of a system can be defined as the state in which both the reactants and products in the chemical reactions are in concentrations that have not changed with time. The rates of reaction of the forward reactions and backward reactions are non-zero, but equal while in an equilibrium system.
By definition, a common ion can be described as an ion that enters the solution from two different sources. Solutions to which NaCl and AgCl are added also contain a common ion will be chloride Cl⁻ ion. The effect of common ions on solubility product equilibrium of the system.
The dissociation of sulphuric acid can be shown as:
H₂SO₄ → 2 H⁺ (aq) + SO₄²⁻ (aq)
MgSO₄ and H₂SO₄ have a common ion SO₄²⁻. H₂SO₄ and HNO₃ have a common ion H⁺ ion.
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Answer:
1. A, C
2. B- Equilibrium will sift to the left.
Explanation:
Human blood types are determined by genes that follow the codominance pattern of inheritance. There are two dominant alleles (A & B) and one recessive allele (O). What is the chance of having children with blood group AB for a couple with the husband of heterozygous A (AO) and the wife of heterozygous B (BO). 25%, 50%, 75%, or 100%.
The chance of having children with blood group AB for a couple with the husband of heterozygous A (AO) and the wife of heterozygous B (BO) is 25%. The correct option is A.
What is blood grouping?The antigens of the ABO blood group are encoded by a single genetic locus, the ABO locus, which has three alternative (allelic) forms A, B, and O.
A child inherits one of the three alleles from each parent, resulting in six genotypes and four blood types.
Blood groups are inherited. They follow a Mendelian pattern, which means they are the result of a single gene.
There are three types of alleles in the ABO gene: A, B, and O. The first two, A and B, are codominant, which means they are equally dominant.
As per the attached Punnett Square, the genotype can be AB, AO, BO, and OO. So, the chance of having children with blood group AB as per the given scenario, will be 25%.
Thus, the correct option is A.
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WHICH OF THE FOLLOWING WOULD NOT BE AN EXAMPLE OF AN OBJECT ACCELERATING?
A the object goes faster
B the object travels at the same speed in the same direction
C the object goes slower
D the object travels at the same speed and changes direction
True or false: Some parasites have complex life cycles where they live in different species of hosts at different stages
Answer:
true
Explanation:
Answer:
True there are a few.
Explanation:
HELP⚠️THANK YOU!!!!!
Can someone tell me what the ionic equation for this is?
2NaOH + Cl2 -> NaCl + NaOCl + HCl
ONLY ANSWER IF YOU KNOW THE ANSWER!
Explanation:
2NaOH +Cl2--> NaCl + NAOCl + HCl
IONIC EQUATION
2Na^+ + 2OH^- +Cl2-->Na^+ + Cl^- + NaOCl + H^+ + Cl^-
THE EQUATION IS NOT BALANCED FOR CHROLINE GAS.
Why are vitamins and minerals are not classified as a food?
Answer:
these micronutrients are not produced in our bodies and must be derived from the food we eat.
Explanation:
Vitamins and minerals are micronutrients required by the body to carry out a range of normal functions. However, these micronutrients are not produced in our bodies and must be derived from the food we eat. Vitamins are organic substances that are generally classified as either fat soluble or water soluble.
What do you mean by the term ' average atomic mass
The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element. Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.
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How many atoms are in 10 g of O
Answer:
Atomic mass O is 15.9994.
Molar mass of O2 =2 X 15.9994=31.99880 g/mole.
10 g X 1 mole/31.99880 g X 6.022 X 10^23 atoms/mole =
188194557295898596197357 atoms in 10 grams O2.
Explanation:
Someone already asked/answered
What do the two arrows in the diagram most likely represent?
O radiation
O photosynthesis
cellular respiration
Oenergy transfers
Oklahoma scientists are experimenting with making biofuels out of crops such as __________ to reduce the impact of biofuel production on food prices.
A.
switchgrass
B.
corn
C.
soybeans
D.
sugarcane
Answer:If biofuels are produced from feedstocks that would have been used for food, then biofuels directly reduce potential food supplies. This reduction occurs even if feedstock price increases result in an expansion of supply because the expanded feedstock supply will typically reduce the supply of other food crops.
Evidence remains limited on the impacts specifically associated with intensified biofuel production, although most of the problems are similar to those already associated with agricultural production – water depletion and pollution, soil degradation, nutrient depletion and the loss of wild and agricultural biodiversity.Specifically, using corn and other food crops to make fuel can raise food prices, pollute water systems, and lead to land-use changes that increase global warming pollution. Sustainable expansion of biofuels requires moving beyond food-based fuels like corn ethanol, and toward cleaner, non-food based biomass resources.
Answer:
Its B. corn
Explanation:
How many moles are in 28 grams of CO2?
what is the formula unit for a compound made from Li and Cl?
LiCl
because Li loses 1 electron ==> Li+
and Cl gains 1 electron ==> Cl-
Li+ Cl-
we use the criss cross rule
===> LiCl
5.Are pure solids included in equilibrium expressions? Explain your answer.
Answer /Explanation:
Corresponding Equilibrium Expression: Pure solids or liquids are excluded from the equilibrium expression because their effective concentrations stay constant throughout the reaction. The concentration of a pure liquid or solid equals its density divided by its molar mass.
What is the strength of Ammonium lauryl sulfate?
Answer:
283.43 g/mol
Explanation:
what is economics in costing
Answer:
The economics in costing is explained below in complete details.
Explanation:
The economic cost is the blend and mixture of wastes of any assets that have a worth connected to them by any one person. The economic cost is practiced largely by economists as a method to examine the prudence of one sequence of performance with that of another. The economic cost varies from accounting cost because it incorporates opportunity cost.
what is the mass of flourine-19
I NEED HELP !!! PLEASE I AM TIMED !! :(( Will mark brainliest i need the right answer these finals killing me... especially chem
Answer:
its d
Explanation:
Answer: it is D
step by step
