Answer:
A.
Explanation:
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PLS HELP URGENT
Electron dot diagrams
Use your periodic table to write the electron dot diagrams for the following atoms.
1. Calcium (Ca)
2. Polonium (Po)
3. Moscovium (Mc)
4. Boron (B)
5. Fluorine (F)
A compound and oxidant react to produce heat and a new product is what reaction
Answer:
A compound and oxidant react to produce heat and new product is chemical reaction.
In a given population, which members are most likely to survive and produce offspring?
Answer:
Those individuals with advantageous traits are more likely to survive and reproduce. The survivors pass down these advantageous traits to their offspring.
Explanation:
Enzymes in your body act as a catalyst. Thus the role of enzymes is to
O inhibit chemical reactions
o increase the rate of chemical reactions
O help you breathe
decrease the rate of chemical reactions
If the volume of an ideal gas is 22.5 L when it is at a temperature of 365 K, what will the volume be when the gas cools to 338K? Be sure to show your work and proper units.
Answer:
20.8L = Final volume of the gas
Explanation:
Based on Charles's law, the volume of a gas is directly proportional to the temperature of the gas under pressure constant. The equation is:
[tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]
where V is volume and T absolute temperature of 1, initial state and 2, final state.
If initial volume is 22.5L, initial T = 365K and final temperature 338K:
22.5L / 365K = V₂ / 338K
20.8L = Final volume of the gasWhat do properties of matter tell us about a substance?
Answer:
Chemical properties of matter describes its "potential" to undergo some chemical change or reaction by virtue of its composition. What elements, electrons, and bonding are present to give the potential for chemical change. It is quite difficult to define a chemical property without using the word "change"
Explanation:
Calculate the molarity of a solution that contains 85.0 g of Zn(C2H3O2)2 in 250. mL of solution (don't forget to convert mL to L first). Round to the nearest hundredth.
Answer:
[Zn(C₂H₃O₂)₂] = 1.85M (3 sig-figs accurate to 0.01 Molar)
Explanation:
Concentration is defined as amount of solute in a specified volume of solution. That is, Concentration = mass of solute/volume of solution (solution = solute + solvent). When concentration is in terms of Molar values the essential relationship is Molarity(M) = moles solute / volume of solution in liters.
For this problem => first, convert mass of Zn(C₂H₃O₂)₂ into moles and then the volume of solution into liters. Take ratio of moles/volume of solution (L).
=> Molar Concentration = moles of Zn(C₂H₃O₂)₂ / Liters of solution
moles of Zn(C₂H₃O₂)₂ = 85.0 grams Zn(C₂H₃O₂)₂ / formula weight of Zn(C₂H₃O₂)₂ = 85.0g/183.5g·mole⁻¹ = 0.463 mole Zn(C₂H₃O₂)₂.
Volume of solution in Liters = 250ml / 1000ml/L = 0.250 liters
Molarity of Zn(C₂H₃O₂)₂ solution = 0.463 mole Zn(C₂H₃O₂)₂ /0.250 liters of solution = 1.85 Molar in Zn(C₂H₃O₂)₂
_____________
Note: The symbiology convention for 'molar solution concentration' is to place brackets around the molecular formula. That is, [Zn(C₂H₃O₂)₂] = 1.85M
(8.6 1029) 7.4 X1029)
Answer:
65563.914234
Explanation:
8.61029 x 7.4 x 1029
63.716146 x 1029
multiply
= 65563.914234
What type of reaction is shown here?
2 NO2-202 + N2
O Double replacement
O Combustion
O Decomposition
O Single replacement
Synthesis
The given reaction is the type of Decomposition reaction. A decomposition reaction occurs when one reactant splits into many products.
What does a reaction's breakdown entail?Chemistry reaction reactions of decomposition. Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.
What are the names for decomposition reactions?Decomposition reactions are those that divide or break the compounds into two simpler products. Because two or more reactants are combined to create a single product in a combination reaction, they are known as the reverse of combination reactions.
The exothermic nature of a decomposition reaction is why?It entails the severing of ties. Energy is necessary to dismantle the bonding between atoms. Decomposition advances when energy in the form of heat or electricity is provided. As the bond is broken during this reaction, energy is given to them, making them endothermic processes.
To know more about the decomposition reaction visit:
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Name the 3 steps involved in the treatment of polluted water? class 7
Explanation:
The processes involved in removing the contaminants include physical processes such as settling and filtration, chemical processes such as disinfection and coagulation, and biological processes such as slow sand filtration
Which substance would be the strongest?
carbon
steel
gold
silver
Answer:
steel
Explanation:
Answer:
B. STEEL
Explanation:
Which salt is the most common found in ocean water?
magnesium
calcium carbonate
potassium
sodium chloride
Answer:
Sodium chloride
Explanation:
There are several salts in seawater, but the most abundant is ordinary table salt or sodium chloride (NaCl). Sodium chloride, like other salts, dissolves in water into its ions, so this is really a question about which ions are present in the greatest concentration. Sodium chloride dissociates into Na+ and Cl- ions.
Select the chemical formula that contains 10 atoms of hydrogen.
2C4H10
2CH4
2C2H5
2C2H6
C.
A 35.5 g cube of aluminum initially at 48.5° C is submerged into 105.3 g of water at 15.4
What is the final temperature of both substances at thermal equilibrium?
Answer:
The final temperature of both substances at thermal equilibrium is 17.3°C
Explanation:
To calculate the final temperature of both substances at thermal equilibrium -:
First , we calculate the heat of A1 cube as follows -
q= mSΔT
(where q = heat of the cube , m = mass of cube , S= specific heat of cube {0.902j/g°C}, T = Temperature )
Putting the values given in the question ,
[tex]q= 32.5g\times0.902\j/g[/tex]°[tex]C[/tex][tex]\times(T_f-45.8[/tex]°[tex]C)[/tex]
[tex]29.315\times(T_f-45.8)J[/tex]
Now , calculate the heat of water -
q=mSΔT
Putting values from the question ,
[tex]q=105.3g\times4.18j/g[/tex]°[tex]C[/tex][tex]\times (T_f-15.4[/tex]°[tex]C)[/tex]
=[tex]440.154\times(T_f-15.4)J[/tex]
Now ,
Heat lost by water A1= Heat gained by water [negative sign about heat lost]
[tex]-29.315\times(T_f-45.8)J[/tex] [tex]=440.154\times(T_f-15.4)J[/tex]
[tex]\frac{-(T_f-45.8)J}{T_f-15.4)J} =\frac{440.154}{29.315}=15.0[/tex]
[tex]-T_f+45.8[/tex]°[tex]C=15T_f-231.2[/tex]°[tex]C[/tex]
[tex](45.8+231.2)[/tex]°[tex]C[/tex]=[tex]16T_f[/tex]
[tex]16T_f=277.03[/tex]°[tex]C[/tex]
[tex]T_f=\frac{277.03}{16}[/tex] = 17.3°C
Therefore , the final temperature of both substances at thermal equilibrium is 17.3°C
At what point in the cooking process is food typically seared?
Answer: when you look at the meat, and it looks beautiful like a crispy donut made by Gordan Ramsay
Explanation:
Hells Kitchen is kewl
Which system is responsible for the production of red blood cells?
hormone erythropoietin (EPO) is responsible for the production of red blood cells.
Balance the equation by typing in the correct coefficients into the blank spaces in front of each formula. Type 1 if
the coefficient is 1, do not leave space blank
_EH + _ G2 → _EG + _HG2
Answer:
2 in front of every one
Explanation:
HOPE IT HELPS
What is the formula for silicon tetrachloride?
a
SiCl4
Ob
Si4Cl
С
Si₂C14
Od
SigCl₂
Answer:
[tex]\boxed {\boxed {\sf A. \ SiCl_4}}[/tex]
Explanation:
We are given the compound name: silicon tetrachloride.
Silicon is a metalloid and chlorine is a nonmetal, therefore we must use the rules of molecular compounds. Molecular compounds use prefixes to name the compounds. Break up the compound into 2 parts.
1. Silicon
The first element: silicon, has no prefix. Therefore, a prefix of mono (1) is implied.
2. Tetrachloride
The -ide suffix is added to the second element, so this is really chlorine. The prefix of tetra means 4.
So there is 1 silicon (Si) atom and 4 chlorine (Cl) atoms. The formula must be SiCl₄
helooo i need help please :)
What is the limiting reactant if 10 moles of NH 3 react with 30.0 moles of NO ?
Answer:
NO is the limiting reactant.
Explanation:
4NH3 + 6NO --> 5N2 + 6H2O
Molar ration NH3 : NO = 10: 30 = 1: 3
Stoichiometric molar ration NH3:NO = 4:6 = 2:3
NO is the limiting reactant.
What do the colors of light combine to make _______________ light.
the answer is dure light I'm not sure of this answer ,but it might be to go with .
What is the percent composition of Br in CuBr3?
Answer:
about 79% (79.04369332 to be exact)
Explanation:
Percent composition=(Molar mass of element x amount of it)/Molar mass of compound x 100
Br= 3 x 79.9/303.25 x100=79.04369332
Calculate the number of moles of gas that occupy a 16L container at a pressure of 3 atm and a temperature of 48oC
Answer:
1.81
Explanation:
3*16=n(0.0821)(48+273)
what fault block that is located below the fault
Answer:
it is called the foot blockCan someone help me plz
3. Which of the following do all living organisms have in common? A. Cells held up by cell walls B. The method to get water and food into their cells C. Cells are made from pre-existing cells D. Special cells that can do many different things
Why is think chemistry is important? i need 5 paragraph please
Answer:
because it is so fundamental to our world . chemistry plays a role in everyone lives.
It touches almost every aspect of our existence in some way.
Chemistry is essential for meeting our basic needs of food, cloth, etc.
Chemistry plays a important and useful role towards the development and growth of industries.
chemistry also helps you become who you want to be.
PLEASE HELP ASAP
During convection heat is transferred through fluids. Which statement is true about fluids?
Only gasses are fluids
Only liquids are fluids
Only solids are fluids
Both liquids and gasses are fluids
I'LL GIVE 30 POINTS PLEASE ANSWER!!!
Which terms correctly identify the indicated structures in this sketch of a cell viewed under a microscope? Match each label to the correct cell part. Question 5 options: Golgi Apparatus Nucleus Endoplasmic Reticulum Mitochodrion Ribosome Lysosome
1.
2.
3.
4.
5.
6.
On the periodic table, in which period is copper?
Answer:
At the top of Group 11 above silver and gold.
Period 4
Explanation: