Answer:
Ionic compounds contains ionic bond
Like NaCl
Molecular compounds contains covalent bond like H2O
And metals contains metalic bond like in copper
Explanation:
H2 + O2 -> 2H2O
balanced or unbalanced pls help
Answer:
Unbalanced
Explanation:
The reaction equation is given as:
H₂ + O₂ → 2H₂O
The given reaction flouts the law of conservation of mass and it is not balanced. To know a reaction that is balanced, the number of atoms on both sides of the expression must be the same;
Number of moles
Reactants Products
Hydrogen 2 4
Oxygen 2 2
We see that the hydrogen atoms are not balanced.
name different types of nutrients that our muscles need.
PLEASE ANSWER SOON ITS DUE IN A FEW MIN HELPPPP
Answer:
Biotin. ...
Iron. ...
Vitamin C. ...
Selenium. ...
Omega 3. ...
Vitamin D. ...
Vitamin B12.
Explanation:
Explanation:
They are:-
1. Vitamins
2. Minerals
3. Protein
4. water
5. Fats
6. Carbohydrates
How many molecules are in 100 g of C6H120,?*
Answer:
3.37 × 10²³ molecules
Explanation:
Given data:
Mass of C₆H₁₂O₆ = 100 g
Number of molecules = ?
Solution:
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 100 g/ 180.16 g/mol
Number of moles = 0.56 mol
Number of molecules:
1 mole contain 6.022 × 10²³ molecules
0.56 mol × 6.022 × 10²³ molecules /1 mol
3.37 × 10²³ molecules
What type of bond is Si and S
15. Upon balancing the equation below, how many moles of sulfuric acid are needed to react completely with 6.4 moles of lithium hydroxide?
LIOH + H2SO4 -> Li2SO4 + H20 (2 points)
12.8 mol H2SO4
6.4 mol H2SO4
O 3.2 mol H2SO4
O 2.1 mol H2SO4
Moles of Sulfuric acid- H₂SO₄ needed to react completely : 3.2 moles
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction(balanced)
2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O
From the reaction equation above, the reaction coefficient shows the mole ratio of reagents and products
moles of Lithium hydroxide-LiOH = 6.4 moles
mol ratio of LiOH : H₂SO₄ = 2 : 1, so mol H₂SO₄ :
[tex]\tt moles~H_2SO_4=\dfrac{1}{2}\times 6.4=3.2[/tex]
What is a constraint on the solar oven design?
A. The solar oven must heat up quickly
B. The design should look like the provided diagram
C. The solar work in any kind of weather
D. The materials may cost no more than sixty dollars
Answer:
D
Explanation:
I may need a photo but D seemed the most logical
Which process is a genetic engineering process?
exposing food to radiation, which causes mutation in the genes
removing DNA from cells of the food
replacing some genes of the food with genes from other species
protecting food with an antimicrobial coating
Answer:
Replacing some Gene's of the food with Gene's from other species
Answer:
C. replacing some genes of the food with genes from other species
Explanation:
just did the quiz good luck <3
14.What is the main difference between a generator and an electric motor? A generator produces electricity and an electric motor consumes electricity. A generator uses a permanent magnet and an electric motor uses an electromagnet. A generator produces a magnetic field and an electric motor produces an electric field. A generator uses a rotating magnetic field and an electric motor uses a non-moving magnetic field. 15.A science lab has copper wire coated with rubber tubing, a plastic vial, and a pair of cotton gloves. Which of these materials is not an electrical insulator? A.Copper wire B.Cotton gloves C.Plastic D.Rubber tubing
Answer:
14) A generator uses a rotating magnetic field and an electric motor uses a non-moving magnetic field.
15) Copper wire
Explanation:
The electric motor is device that that converts electrical energy into mechanical energy. The armature and coil are positioned between two powerful magnets with a split ring commutator and carbon brushes. A cell is connected to the carbon brushes.
If the armature of the electric motor is made to rotate, it will act as a generator delivering current at the terminals.
An insulator is a material that does not allow electric current to pass through it. Copper allows the passage of electric current hence it is not an insulator.
The exchange of gases in lungs take place in alveoli. True or false
Answer:
True
Explanation:
At the end of each bronchiole is a cluster of little air sacs called alveoli. Alveoli are wrapped in tiny blood vessels called capillaries. The air you breathe in fills these air sacs with oxygen-rich air. This is where the exchange of gases occurs.
based on the law of multiple proportions, how many grams of hydrogen would you expect 2.58 g of nitrogen to combine with to yield ammonia?
Based on the law of multiple proportions, there are 0.55 grams of hydrogen.
Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
In one molecule of the ammonia, there are three hydrogen atoms and one nitrogen atom
In a molecule of ammonia (NH3), proportion of the masses of nitrogen and hydrogen is:
m(N) : m(H) = 14 : (3·1) = 14 : 3
Mass of nitrogen is 2.58 grams
2.58 g : m(H) = 14 : 3
m(H) = 0.55 g; mass of hydrogen needed to react with nitrogen
Balanced chemical reaction: N₂ + 3H₂ ⇄ 2NH₃
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Explain your observations on what organisms need to grow. Explain how human activity can impact an organism's ability to obtain the resources it needs to survive. State your opinion about how human activity can be changed to have less impact on the lives of other organisms.
Answer:
The human being sometimes exploits the resources that other living organisms need to survive. This is how competition for the environment increases and many species on this planet are at risk of extinction.
Explanation:
An example of this is how humans exploit mambu canes for commercial products, such as sweets and even toys, thus generating that the panda bear species does not have a food resource to survive.
How did mossely esablish a more accurate periodic table
Explanation:
arranged by their number of protons rather than their atomic mass
Why does the density of a substance stay constant even if the mass of the substance increases?
Answer:
If the mass stays constant the object's density decreases as the volume increases. ... Because the property of density is a constant for all variables, density can be used to identify the material an object is made of.
Explanation:
PLEASE HELP ill be asking more questions for whoever wants to help THANK YOU:)
A.In a chemical reactions, substances after the arrow are called ________.
C2H4 + O2 → CO2 + H2O
1 products
2 reactants
3 no answer text provided
4 chemicals
B.In this reaction: sodium + water -> sodium hydroxide + hydrogen gas
which substances are the reactants?
1 hydrogen gas
2 sodium hydroxide + hydrogen gas
3 sodium + water
4 sodium hydroxide
C. This is an example of what type of reaction?
Mg + Fe2O3 → Fe + 3 MgO
1 decomposition
2 double replacement
3 single replacement
4 synthesis
5 combustion
D. This is an example of what type of reaction?
Ca(OH)2 + Al2(SO4)3 → CaSO4 + Al(OH)3
1 synthesis
2 decomposition
3 double replacement
4 combustion
5 single replacement
E. This is an example of what type of reaction? PbSO4->PbSO3 + O2
1 single replacement
2 combustion
3 double replacement
4 synthesis
5 decomposition
F. This is an example of what type of reaction?
C2H4 + O2 → CO2 + H2O
1 single replacement
2 double replacement
3 synthesis
4 decomposition
5 combustion
Each reaction has its own characteristics which can be determined from the reactants and products
Further explanationEvery chemical reaction involves a compound consisting of reactants and products
Reactants are compounds that react and form new compounds called products
There are several forms of reactions that can occur, including single replacement, double replacement, synthesis, decomposition, etc.
A. substances after the arrow are called 1 products
The product compounds in this reaction are: CO₂ + H₂O
B. which substances are the reactants : sodium + water
and The product compounds : sodium hydroxide + hydrogen gas
Reaction
2Na(s) + 2H₂O → 2NaOH(aq) + H₂(g)
C. Mg + Fe₂O₃ → Fe + 3 MgO is an example of single replacement :one element replaces the other elements of a compound to produce new elements and compounds
D. Ca(OH)₂ + Al₂(SO₄)₃ → CaSO₄ + Al(OH)₃ is an example of double replacement : there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
E. PbSO₄->PbSO₃ + O₂ is an example of decomposition : One compound breaks down into 2 components
F.C₂H₄ + O₂ → CO₂ + H₂O is an example of combustion : when Oxygen combines with hydrocarbon
When aqueous solutions of Li3PO4 and MgSO4 are mixed, Mg3(PO4)2 is a precipitate
formed. What is the balanced net ionic equation?
Answer:
Li2SO4
Explanation:
Balance the reaction of Li3PO4 + MgSO4 = Li2SO4 + Mg3(PO4)2 using this chemical equation balancer!
What is the charge of phosphate in AlPO4?
The charge of phosphate : 3-
Further explanationOxidation is an increase in oxidation number, while reduction is a reduction in oxidation number.
The formula for determining Oxidation Numbers in general:
1. Single element atomic oxidation number = 0.
Group IA (Li, Na, K, Rb, Cs, and Fr): +1
Group IIA (Be, Mg, Ca, Sr and Ba): +2
Group IIIA(Al, B) : +3
H in compound = +1, except metal hydride compounds (Hydrogen which binds to groups IA or IIA) oxidation number H = -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF2 = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in an uncharged compound = 0,
Total oxidation number in ion = ion charge, Example NO₃⁻ = -1
Compound AlPO₄ :
The oxidation number in an uncharged compound = 0
Since the charge of Al as group 3A (or group 13) is +3, while the AlPO₄ compound is a polyatomic compound (consisting of polyatomic ions PO₄ and Al), the PO₄ charge:
charge Al + charge PO₄ = 0
+ 3 + charge PO₄ = 0
charge PO₄ = -3
Help PLEASE!! Will mark brainly Calculate the total energy in 1.5 x 10^13 photons of gamma radiation having wavelength = 3.0 x 10^-12 m. Need to show ALL work.
Answer:
E = 0.994 J
Explanation:
Given that,
Total no of photons, [tex]n=1.5\times 10^{13}[/tex]
The wavelength of gamma radiation, [tex]\lambda=3\times 10^{-12}\ m[/tex]
We need to find the total energy in given no of photons. The formula for the energy of a photon is given by :
[tex]E=\dfrac{hc}{\lambda}[/tex]
For n photons,
[tex]E=\dfrac{nhc}{\lambda}\\\\E=\dfrac{1.5\times 10^{13}\times 6.63\times 10^{-34}\times 3\times 10^8}{3\times 10^{-12}}\\\\=0.994\ J[/tex]
So, the total energy is 0.994 J.
What does the chemical formula CaCl2 show about the compound it represents? It is made up of one element. It is made up of two elements. It is made up of three elements. It is made up of four elements.
Answer:
2
Explanation:
not 100%sure hehe
The compound calcium chloride with the formula CaCl₂ has two elements namely, calcium and chlorine. Hence, option b is correct, the compound is made of 2 elements.
What is a compound ?A compound is a chemical substance which is made by the combination of atoms of two or more elements. The bonding type of this elements differ from compound to compound.
Calcium chloride is an ionic compound formed by the electron transfer from calcium to chlorine. The two electrons of the valence shell of Ca is donated to each chlorine atoms.
The number of elements in this compound is thus 2, which are calcium and chlorine. There are three atoms in one calcium chloride molecule. One of calcium and two atoms of chlorine. Hence, option b is correct.
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In a double bond, two atoms share a total of _____ electrons. a two b three c four d six
Answer:
C: 4
Explanation:
In every single covalent bond, each atom shares one electron. 1 + 1 = 2. A double bond is just two bonds so, 2 x 2 = 4.
I don't know how to transcribe the following DNA sequecne too rna
Answer:
There is only one change when transcribing from a DNA sequence to a RNA sequence.
Explanation:
The change when transcribing is that instead of thymine (T) in a DNA sequence, you have Uracil (U) in a RNA sequence. The rest will stay the same. So, DNA has ATCG, whereas RNA has UACG. There should be NO thymine (T) in your RNA sequence–– it should only include the four of the following: UACG.
[FORMAT]: DNA is to RNA
A is to U (IMPORTANT, NO "T") –– Think as Apples Under the Tree
T is to A –– Think as Trees have Apples
C is to G –– Think as Car in the Garage
G is to C –– Think as Inside the Garage are Cars
PLEASE HELP ASAP!!
Choose the reaction that would not lead to the production of hydrogen gas. a. Cu + HCl
b. Na + H2SO4
c. K + H2O
d. Zn + HCl
Answer:
the answer should be c.
Explanation:
According to Kepler’s 3rd law of motion, which planet will have the shortest orbital period?
A). Jupiter
B). Mercury
C). Earth
D). Saturn
Answer:
B: Mercury
Explanation:
Yuh
true or false all cells are the same size
Answer:
False
Explanation:
Answer:
false
Explanation:
yes
Todds apartment building has a statue hanging from the balcony. The statue
breaks off and falls to the sidewalk below. What energy conversion takes
place during the far?
Energy conversion takes place during the far Gravitational Potential Energy to Kinetic Energy.
What is kinetic Energy?Kinetic energy = total energy - potential energy.
The total energy of a system is the addition of kinetic and potential energy of the system. Kinetic energy can be regarded as a form of energy posses by an object when it's in motion.
Total energy = kinetic energy + potential energy.
Hence, in this question when the statue breaks off and falls to the sidewalk below gravitational potential energy is converted to kinetic Energy.
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Answer:
Gravitational potential energy to kinetic energy
Explanation:
Chromium has four naturally occurring isotopes. cr-50 (mass of 49.946 amu and 4.35% abundance); cr-52 (mass of 51.941 amu and 83.79% abundance); cr-53 (mass of 52.941 amu and 9.50% abundance); and cr-54 (mass of 53.939 amu and 2.36% adundance). calculate the average atomic mass of chromium to 3 decimal points. average atomic mass=(mass a)(%a) (mass b)(%b) (mass c)(%c) (mass d)(%d) 100
The average atomic mass of chromium to 3 decimal points is 52. 055 g. mol.
What is the average atomic mass?"The weighted average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight."
Given the different isotopes of chromium.
The four isotopes of chromium are cr-50, cr-52, cr-53 cr-54.
The average atomic mass will be
Let us take the weighted average of your isotopes:
50 × 0.0434 + 52 × 0.8379 + 53 × 0.095 + 54 × 0.0237 = 52. 055 g.
Thus, the average atomic mass of chromium is 52. 055 g.
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How many milliliters of 11.5 m hcl(aq) are needed to prepare 675.0 ml of 1.00 m hcl (aq)?
To prepare a solution of hcl(aq) with a volume of 675.0 ml and a concentration of 1.00 m from a concentrated solution of 11.5 m we need a volume of: 58.69 ml
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solutionv1 = volume of the concentrated solutionc2 = concentration of the diluted solutionv2 = volume of the diluted solutionInformation about the problem:
c1 = 11.5 mc2 = 1.00 mv2= 675.0 mlv1=?Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:
c1 * v1 = c2 * v2
v1 = (c2 * v2)/ c1
v1 = (1.00 m * 675.0 ml)/ 11.5 m
v1 = 58.69 ml
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
Solvent: it usually is in a major amount than the soluteSolute: it usually is in less amount than the solventLearn more about chemical solution at: brainly.com/question/13182946
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Which has more thermal energy: 5 grams of water at 50 °C or 500 grams of water at 50 °C?
Explain your answer.
Answer:
500 grams
Explanation:
its because it has more water. The amount of thermal energy available in a substance is proportional to the mass of the substance.
please help! Chemistry is not my subject! Thanks
Answer:
the answer is B
Al(s) ⇒ Al3+(aq) + 3e-
and Au+(aq) + e- ⇒ Au(s)
Which of the following is evidence that groundwater cause erosion and deposition
Answer:You didn't provide examples
Explanation: Groundwater can cause erosion under the surface as it moves through the soil. During the movement an acid is formed which what causes erosion and deposition.
Hope that helps
At 273°K and 1 atm (STP), the volume of a gas is 1000ml. If the temperature changes to
298° K and the pressure is doubled, what is the new volume of the gas?
Answer:
V₂ = 545.79 mL
Explanation:
Given data:
Initial volume = 1000 mL
Initial pressure = 1 atm
Initial temperature = 273 K
Final temperature = 298 K
Final volume = ?
Final pressure = 2 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1 atm × 1000 mL × 298 K / 273 K × 2 atm
V₂ = 298000 atm .mL. K / 546 K.atm
V₂ = 545.79 mL