Answer: 4.87 g
Explanation:
We know that for every 3 moles of zinc that are consumed, 3 moles of hydrogen are produced (we can reduce this to the number of moles of zinc consumed = moles of hydrogen produced)
We know that the formula mass of hydrogen is 2(1.00794)=2.01588 g/mol, so in 0.15 g, there is about 0.15/2.01588 = 0.074409191023275 moles.
This means that about 0.074409191023275 moles of zinc are needed, and since the atomic mass of zinc is 65.409 g/mol, the answer is (0.074409191023275)(65.409)=4.87 g
What happens in a synthesis reaction?
A. Two substances combine to form a single new substance.
B. One substance breaks down into two substances.
C. One substance separates into ions in solution.
D. Atoms in two substances rearrange to form new substances.
Answer: A) two substances combine to form a single new substance
Answer:Two substances combine to form a single new substance.
Explanation: just took it
select two correct answers
Answer:
D and E
Explanation:
The other answers don't support steel, they support iron or are supporting both, and the question is why steel alloys are more often used
C supports both
B supports how iron's strength
A supports iron being easily shaped and bent
hope this helps
Which of the following is an ionization reaction?
a. H2SO4 (aq) + Ca(OH)2 (aq) → CaSO4 (s) + 2 H2O (l)
b. NH3 (aq) + H2O (l) ⇋ NH4+ (aq) + OH– (aq)
c. CH3COO– (aq) + H2O (l) ⇋ CH3COOH (aq) + OH– (aq)
d. None of these
e. H2O (l) + H2O (l) ⇋ H3O+ (aq) + OH– (aq
Answer:
d
Explanation:
Question 9
5 pts
Which energy transfer is correctly matched?
Fusion in the sun: chemical to light and heat
Lighting a match: heat energy into chemical energy
a cell phone: thermal to electrical
Turning on a ceiling fan: electrical to mechanical
Answer:
fusion in the sun
Explanation:
I know this because I am currently talking this test and I know it cause I did it
Answer:Turning on a ceiling fan: electrical to mechanical
I took the test and Fusion in the sun: chemical to light and heat Lighting a match: sound energy into chemical energy were the wrong answers.
Dissolving salt in water causes a CHEMICAL change. true or false
Answer:
False. It is a PHYSICAL change.
please help me please
Answer:
Two advantages are: Its cheap and it is a renewable energy source. Two disadvantages are it's not windy everyday and it will take up a lot of space for windmills.
Explanation:
What is the name of the planet next to the label A?
Solar System
EARTH
SUN
A. Uranus
O ОО
B. Neptune
C. Jupiter
d
D. Saturn
Please help
Answer:
B. Neptune. Neptune is next to Uranus
Which of the following is a primary source for scientific information? O A. Doctoral theses OB. A handbook of scientific facts O C. Reviews of scientific studies D. Public opinion about a scientific issue
What is the phase label on HCl?
A. g
B. aq
C.
D. e
E. s
Answer:
B. aq if the reaction is inorganic (double or single displacement), neutralization, etc.
Explanation:
Hello there!
In this case, unfortunately we are not given the undergoing chemical reaction; however, in the most of the double displacement, neutralization, precipitation and in general, inorganic reactions, the hydrochloric acid must be B. aq as it must be dissolved in water as the reaction media. On the other hand, in some organic reactions, it can be either aqueous or gaseous, the latter, specially as a product. For that reason, you will need to make sure whether your reaction is organic or inorganic to correctly figure out the phase label.
Best regards!
Juan observes a material in the rocks of a hilluan hammers off a piece and then examines the pieces with a hana tena He
makes the following notes about what he observes
• has luster
• cubic crystals
• clear in color
What did he most likely observe through the hand lens?
A)
rock
B)
fossil
mineral
D)
animal bones
Answer:
I definitely think he mostly observed that it was clear in color.
Explanation:
In this project, you will develop a model of a chemical reaction that either releases energy or absorbs energy. Whether a reaction releases or absorbs energy depends on the overall difference in the bond energies of the reactants and products. Your model should show the relationships between the parts of the system. These parts are the molecules and atoms that take part in the reaction. The model should also distinguish the reaction system from other systems.
Answer:
that ain't chemistry that's science
The change of energy from one form to another result in _____. Need help please
Answer:
The change of energy form one form to another result in chemical reaction!
Ice at 0.0 degrees Celsius is combined with 50.0g of water at 75.0 degrees Celsius. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.00 degrees Celsius after the ice melts. Specific heat of water is 4.18 J/g degrees Celsius. SHOW WORK!
Answer:
m-Ice = 23.85g
Explanation:
The heat absorbed for the cold water (Heat of the increase of water + Heat of ice melting) is equal to the heat released for the water at 75°C. The equation is:
m-Ice-*C*ΔT + Hf*-m-Ice = m-water*C*ΔT
Where m-Ice- is our incognite
C is specific heat of water = 4.18J/g°C
ΔT is change in temperature = 25.0°C - 0.0°C = 25.0°C
Hf is enthalpy of fusion of water = 333.6J/g
m-water = 50.0g
ΔT is change in temperature = 75.0°C - 25.0°C = 50.0°C
m-Ice-*4.18J/g°C*25°C + 333.6J/g*-m-Ice = 50.0g*4.18J/g°C*50.0°C
104.5 m-Ice- + 333.6 m-Ice- = 10450
438.1 m-Ice = 10450
m-Ice = 23.85gCalculate the pOH of this solution. pH = 1.90 pOH =
Answer:
12.1Explanation:
Since the pH has been given, the pOH can be found by using the formula
pH + pOH = 14
pOH = 14 - pH
From the question we have
pOH = 14 - 1.9
We have the final answer as
12.1Hope this helps you
Answer:
12.10
Explanation:
Be sure to answer all parts. For an aqueous solution of sodium chloride (NaCl), determine the molarity of 4.05 L of a solution that contains 195 g of sodium chloride. M Determine the volume of this solution that would contain 4.63 moles of sodium chloride. L Determine the number of moles of sodium chloride in 25.35 L of this solution. mol
Answer:
[tex]0.824\ \text{M}[/tex]
[tex]5.62\ \text{L}[/tex]
[tex]20.89\ \text{mol}[/tex]
Explanation:
Molar mass of NaCl = 58.44 g/mol
Mass of NaCl = 195 g
Volume of solution = 4.05 L
Molarity of solution is
[tex]\dfrac{195}{4.05}\times \dfrac{1}{58.44}=0.824\ \text{M}[/tex]
The molarity of the solution is [tex]0.824\ \text{M}[/tex]
Moles of NaCl = 4.63 mol
Volume is given by
[tex]\dfrac{4.63}{0.824}=5.62\ \text{L}[/tex]
The volume of the solution that contains the required amount NaCl is [tex]5.62\ \text{L}[/tex]
Volume of solution = [tex]25.35\ \text{L}[/tex]
Moles of solution is given by
[tex]0.824\times 25.35=20.89\ \text{mol}[/tex]
The number of moles of NaCl is [tex]20.89\ \text{mol}[/tex].
Which of the following is NOT one of the three layers that terrestrial worlds have?
Core
Crust
Mantle
Seismic zone
To check the accuracy of a new method, a standard copper alloy containing 23.24% Cu was analyzed and calculated to contain 23.17%. calculate the relative error of the method in parts per thousand (ppt).
Answer:
3ppt is the relative error of the method
Explanation:
The relative error is a measurement used to determine the accuracy of your experiment, the equation to find the value in parts per thousand is:
Error = |True Value - Observed Value| / True Value * 1000
Where True value is 23.24%
And Observed value is 23.17%
Replacing:
Error = |23.24% - 23.17%| / 23.24% * 1000
Error =
3ppt is the relative error of the methodwhy was the introduction of oxygen such a big deal?
Why is a rotting apple a reaction in which energy is neither absorbed nor released?
A. The chemical energy in the reactants is almost equal to the chemical energy in the products.
B. The chemical energy in the reactants is much greater than the chemical energy in the products.
C. The chemical energy in the reactants is much less than the chemical energy in the products.
( don’t send links, I won’t click them)
I take in oxgyen from the air and send it into your bloodstream. I also remove the carbon dioxide from your body. What system am I?
muscular system
respiratory system
digestive system
skeletal system please help
In exothermic reactions, the system
in energy.
energy, while the surroundings
*
absorbs, increase
absorbs, decrease
releases, increase
releases, decrease
Answer:
releases, increase
Explanation:
The total energy of products in an Exothermic reaction is less compare to
total energy of the reactants. As a result of these the enthalpy becomes negative, then there is release of heat to the surroundings, which increase the energy of the immediate surroundings inform of heat. Hence the system release energy while the surroundings energy increase.
What is the name of the compound Cd(MnO4)2?
A
cadmium manganate
B.
cadmium manganite
C.
cadmium permanganate
O
D.
admium permanganite
Convert 2.178×1010 g to each of the following units.
Answer:
2.178x10⁷kg, 2.178x10¹³mg, 2.178x10¹⁶μg, 2.178x10⁴ metric tons.
Explanation:
The units are kg, μg, mg and metric tons (1metric ton = 1000kg)
To solve this question we must convert, first, the grams to milligrams, and to kilograms. Then, the kilograms to metric tons and the milligrams to micrograms:
kg:
2.178x10¹⁰g * (1kg / 1000g) = 2.178x10⁷kg
mg:
2.178x10¹⁰g * (1000mg / 1g) = 2.178x10¹³mg
μg:
2.178x10¹³mg * (1000μg / 1mg) = 2.178x10¹⁶μg
metric tons:
2.178x10⁷kg * (1metric ton / 1000kg) = 2.178x10⁴ metric tons
atoms that have a high electronegativity...
Helium, bromine, agron, neon,flourine
Given the following skeleton equation, what are the coefficients for the chemicals in the reaction? __ FeSO4 + __ Al(OH)3 → __ Al2(SO4)3 + __ Fe(OH)2
Answer:
3 FeSO4 + 2 Al(OH)3 -> 1 Al2(SO4)3 + 3 Fe(OH)2
Explanation:
Which process breaks down a compound into its elements?
Answer:
Chemical decomposition
Explanation:
Chemical decomposition, analysis or breakdown is the separation of a single chemical compound into its two or more elements or to simple compounds.
Answer:
Other processes that break down chemical substances into simpler substances, include depolymerization, decomposition, etc
Hope it helps!!!
Explanation:
In many cases, a negatively charged compound (ex Cl-) will interact with a positively charged metal (ex Fe2 ). Usually we would consider this type of interaction to be ionic, but in the case of metals we do not. What type of bond is being formed when a ligand interacts with a metal and how could you know that the bond you are forming is that type of bond
Answer:
See Explanation
Explanation:
An ionic bond occurs due to electrostatic attraction between a positively charged ion and a negatively charged ion.
A metal and a ligand are bound by a coordinate covalent bond or a dative bond. This bond occurs due to donation of electron pairs from ligands to available orbitals on metals.
The formation of coordinate bonds is evident when neutral molecules or negative ions with non bonding electrons donate same to empty metal orbitals. This is sometimes shown by an arrow pointing from the ligands to the metal center.
For instance; tetraammine copper II ion is formed when four ammonia molecules donate a lone pair each to available vacant orbitals of the copper metal center to form [Cu(NH3)4]^2+.
Question 6
Simplify the following expression
-3 + 4(a - 3b + 2) - 514 - a + 3b)
1. There are basic particles from which matter could
be made except
salt.
B
atom.
Cion.
D molecules.
Answer: Hello, There! your Answer is Below
Option A Salt
Explanation:
Salt is A Chemical Used For Varites of Purposes, So It's not Part of Matter.
Atom being the Smallest Part of Molecule And ion Are Charge Which is Part of Matter.
Hope this helps!!
Have a great day!!!
A tree can be a _________________________ for insects in a schoolyard.
Answer:
habitat/shelter
Explanation: