Answer:
5.a ball stuck on a roof
6.A
7.mechanical_electrical
8.A solenoid
How many moles of aluminum are needed to react with 12 moles of hydrochloric
acid
answer with explanation and you’ll get brain list
Answer:
Option D.
Explanation:
6H₂ + P₄ → 4PH₃First we convert the given reactant masses into moles, using their respective molar masses:
4.00 g H₂ ÷ 2 g/mol = 2 mol H₂6.20 g P₄ ÷ 124 g/mol = 0.05 mol P₄0.05 moles of P₄ would react completely with (6*0.05) 0.3 moles of H₂. There are more H₂ moles than required, meaning H₂ is in excess and P₄ is the limiting reactant.
Now we calculate how many PH₃ moles could be formed, using the number of moles of the limiting reactant:
0.05 mol P₄ * [tex]\frac{4molPH_3}{1molP_4}[/tex] = 0.2 mol PH₃Finally we convert 0.2 mol PH₃ into grams, using its molar mass:
0.2 mol PH₃ * 34 g/mol = 6.8 gSo the correct answer is option D.
What is the empirical formula of C20H40
Answer:
CH2
Explanation:
The empirical formula gives the lowest whole number ratio of the elements. In this case, both subscripts can be divided by 20, hence CH2.
Identify the type of each reaction in the copper cycle.
C u S O 4 ( a q ) + Z n ( s ) ⟶ Z n S O 4 ( a q ) + C u ( s ) Choose...
C u ( N O 3 ) 2 ( a q ) + 2 N a O H ( a q ) ⟶ C u ( O H ) 2 ( s ) + 2 N a N O 3 ( a q ) Choose...
C u O ( s ) + H 2 S O 4 ( a q ) ⟶ C u S O 4 ( a q ) + H 2 O ( l ) Choose...
C u ( s ) + 4 H N O 3 ( a q ) ⟶ C u ( N O 3 ) 2 ( a q ) + 2 N O 2 ( a q ) + 2 H 2 O ( l ) Choose...
C u ( O H ) 2 ( s ) Δ −→ C u O ( s ) + H 2 O ( g ) Choose...
Answer:
CuSO4 (aq) + Zn ( s ) ⟶ ZnSO4 (aq) + Cu (s): single displacement.
Cu(NO3)2(aq) + 2NaOH(aq) ⟶ Cu(OH)2(s) + 2NaNO3 (aq): Double displacement.
CuO(s) + H2SO4 (aq) ⟶ CuSO4 (aq) + H2O( l ): Double displacement.
Cu(s) + 4HNO3 (aq) ⟶ Cu(NO3)2 (aq) + 2NO2(aq) + 2H2O(l): Redox
Cu(OH)2 (s) Δ −→ CuO (s) + H2O(g): Decomposition.
Explanation:
Hello!
In this case, for the given chemical reactions, we obtain:
CuSO4 (aq) + Zn ( s ) ⟶ ZnSO4 (aq) + Cu (s): single displacement as the zinc metal is displacing copper in copper (II) sulfate.
Cu(NO3)2(aq) + 2NaOH(aq) ⟶ Cu(OH)2(s) + 2NaNO3 (aq): Double displacement as sodium is getting with nitrate and copper (II) with hydroxide.
CuO(s) + H2SO4 (aq) ⟶ CuSO4 (aq) + H2O( l ): Double displacement as the oxygen in the cupper (II) oxide turns out with the hydrogen and as a result, copper (II) sulfate is formed.
Cu(s) + 4HNO3 (aq) ⟶ Cu(NO3)2 (aq) + 2NO2(aq) + 2H2O(l): Redox since the copper joins NO3 but at the same time NO2 is released (Nitrogen goes from 5+ to 4+).
Cu(OH)2 (s) Δ −→ CuO (s) + H2O(g): Decomposition as copper (II) hydroxide is separated into copper (II) oxide and water.
Regards!
Chemical reactions are classified on the basis of the sort of change taking place in the reaction.
A chemical reaction involves the conversion of reactants into products. There are several kinds of chemical reactions depending on the nature of the change that is taking place. In the question, we have several are reactions from the copper cycle.
These copper reactions are classified as follows;
C u S O 4 ( a q ) + Z n ( s ) ⟶ Z n S O 4 - Singe replacementC u ( N O 3 ) 2 ( a q ) + 2 N a O H ( a q ) ⟶ C u ( O H ) 2 ( s ) + 2 N a N O 3 ( a q ) - NeutralizationC u O ( s ) + H 2 S O 4 ( a q ) ⟶ C u S O 4 ( a q ) + H 2 O ( l ) - NeutralizationC u ( s ) + 4 H N O 3 ( a q ) ⟶ C u ( N O 3 ) 2 ( a q ) + 2 N O 2 ( a q ) + 2 H 2 O ( l ) - Single replacementC u ( O H ) 2 ( s ) Δ −→ C u O ( s ) + H 2 O ( g ) - DecompositionLearn more: https://brainly.com/question/2510654
What can I do to increase the strength of an electric field (static electricity) on an object
Answer:
The strength of an electric field as created by source charge Q is inversely related to square of the distance from the source. This is known as an inverse square law. Electric field strength is location dependent, and its magnitude decreases as the distance from a location to the source increases
What mass of lithium phosphate would you mass to make 2.5 liter of 1.06 M lithium
phosphate solution?
Answer:
Approximately [tex]3.06 \times 10^{2}\; \rm g[/tex] (approximately [tex]306\; \rm g[/tex].)
Explanation:
Calculate the quantity [tex]n[/tex] of lithium phosphate in [tex]V = 2.5\; \rm L[/tex] of this[tex]c = 1.06\; \rm M = 1.06\; \rm mol \cdot L^{-1}[/tex] lithium phosphate solution.
[tex]\begin{aligned}n &= c \cdot V\\ &= 2.5\; \rm L \times 1.06\; mol \cdot L^{-1}\\ &= 2.65\; \rm mol\end{aligned}[/tex].
Empirical formula of lithium phosphate: [tex]\rm Li_3PO_4[/tex].
Look up the relative atomic mass of [tex]\rm Li[/tex], [tex]\rm P[/tex],and [tex]\rm O[/tex] on a modern periodic table:
[tex]\rm Li[/tex]: [tex]6.94[/tex].[tex]\rm P[/tex]: [tex]30.974[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the formula mass of [tex]\rm Li_3PO_4[/tex]:
[tex]M(\rm Li_3PO_4) = 3 \times 6.94 + 30.974 + 4 \times 15.999 = 115.79\; \rm g \cdot mol^{-1}[/tex].
Calculate the mass of that [tex]n = 2.65\; \rm mol[/tex] of [tex]\rm Li_3PO_4[/tex] formula units:
[tex]\begin{aligned}m &= n \cdot M \\ &= 2.65\; \rm mol \times 115.79\; \rm g\cdot mol^{-1} \\ &\approx 3.06 \times 10^{2}\; \rm g \end{aligned}[/tex].
4. Did you know that the polar bear has black fur? Why does it look like it has white fur?
HELP!!!!!
A 1.250-g sample of benzoic acid, C7H6O2, was placed in a combustion bomb. The bomb was filled with an excess of oxygen at high pressure, sealed, and immersed in a pail of water which served as a calorimeter. The heat capacity of the entire apparatus (bomb, pail, thermometer, and water) was found to be 10.134 kJ/K. The oxidation of the benzoic acid was triggered by passing an electric spark through the sample. After complete combustion, the thermometer immersed in the water registered a temperature 3.256 K greater than before the combustion. What is DEcombustion per mole of benzoic acid burned
Answer:
3224 kJ/mol
Explanation:
The combustion of benzoic acid occurs as follows:
C₇H₆O₂ + 13/2O₂ → 7CO₂ + 3H₂O + dE
The change in temperature in the reaction is the change due the energy released, that is:
3.256K * (10.134kJ / K) = 33.00kJ are released when 1.250g reacts
To find the heat released per mole we have to find the moles of benzoic acid:
Moles benzoic acid -Molar mass: 122.12g/mol-:
1.250g * (1mol / 122.12g) = 0.0102 moles
The dE combustion per mole of benzoic acid is:
33.00kJ / 0.0102moles =
3224 kJ/mol
HELP ASAP Describe how transferring energy into the substance affected the speed of the molecules. (Amplify science)
Answer:The faster the molecules of a substance move, the higher the kinetic energy, and the higher the temperature
Energy can be transfer from a substance through a process called conduction. In conduction, faster-moving molecules contact slower-moving molecules and move energy to them.
What do you mean by the conduction ?The term conduction is defined as the process by which heat energy is transferred through collisions between neighboring atoms or molecules.
Conduction occurs more promptly in solids and liquids, where the particles are closer together than in gases, where particles are further apart.
The faster the molecules of a substance change, the higher the kinetic energy, and the higher the temperature.
Thus, During conduction the slower-moving molecules speed up and the faster-moving molecules slow down.
To learn more about the conduction, follow the link;
https://brainly.com/question/12136944
#SPJ2
Calculate the value of Kp at 227°C for the equilibrium: 3 A(g) ⇌ B(g) + D(g) Kc = 5.15
a. 7.52
b. 0.125
c. 96.0
d. 0.0653
e. 276
What is the speed of the green line if the distance it covered is 4 m in a time of one second
40m/s
4m/s
2m/s
Answer: 40m/s
Explanation:
If a candy bar contains 345 Calories, how many calories is this?
Answer: 345,000 calories
Explanation:
Calories in food such as candy bars refer to the amount of energy that the food has. Calories are also called Kilocalories because they are the equivalent of 1,000 calories.
If the candy bar contained 345 calories therefore, and 1 Calorie is 1,000 calories, the calories in the candy bar are:
= 345 * 1,000
= 345,000 calories
why does ocean water found near the poles often have a higher leaves of salinity than ocean water found near the equator
The ocean water found near the poles has a higher level of salinity because the area of rain reduces as one moves toward the poles, and as a result of less rain and more sunshine, evaporation increases.
What is salinity?Salinity is the presence of salt in the water. Freshwater bodies have very less amount of salt, but ocean water has a large amount of salt dissolved in it.
Because cold polar air cools the water and decreases its temperature, raising its salinity, water close to the poles frequently has more salinity. When fresh water freezes out of seawater to form sea ice, the salinity of the remaining water likewise rises.
Therefore, as one travels toward the poles, the area of rain decreases, and as a result of less rain and more sunshine, evaporation increases, and the ocean water there has a higher level of salinity.
To learn more about salinity, refer to the link:
https://brainly.com/question/11798887
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There are clouds forming over Florida. The temperatures in the clouds and in the air are above freezing. Which form of precipitation do you expect Florida to get and why?
Answer:
Rain
Explanation:
Clouds are formed from water vapor, which turns into ice when the temperature is below freezing, and falls as liquid rain water when temperatures are above freezing. Since the temperatures in the clouds and in the air are above freezing, rain will fall in Florida.
Answer:
Rain
Explanation:
PLEASE PLEASE PLEASE HELP ASAP!!!
Which of the following is NOT considered evidence for plate tectonics? *
1 point
Earthquakes and volcanoes occur along specific zones.
Meteorite craters are found in various locations around the world.
The seafloor is separating along mid-ocean ridges.
The coastlines of South America and Africa seem to match up.
Answer:
It should be B
Explanation:
I hope this helps
Chemistry help will be grateful thanks
Answer:
a = double displacement(iii)
b = Single displacement (ii)
c = Synthesis reaction (i)
d = decomposition reaction (iv)
Explanation:
It's not that hard!
Newton's second law states that force is equal to
mass times weight
mass times acceleration
weight divided by mass
weight times acceleration
what adaptation help protect a cactus against herbivores
Answer:
spines
Cacti have spines, which are also called needles or thorns. Spines are modified leaves or leaves that have changed. Spines do not dry out. Spines deter herbivores from consuming this plant.
Explanation:
hope this helps...
Answer: Tunneling underground to offer protection from predators and extreme temperatures.
Explanation: A behavioral adaptation aimed at attracting a mate. A physical adaptation that allows birds to catch prey. Modified leaves that protect a cactus from herbivores.
2 CO(g) + O2(g) + 2 CO2(g)
What type of reaction is shown above?
Answer:
I'm pretty sure its a combination reaction!!
Explanation:
they generally form between metals and non metals like that^
Don’t understand need explanation and answer will give brain list
Answer:
B. is the answer.
Explanation:
Hello there!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed, we infer that the correct answer must have the same number of atoms at both sides of the equation.
Therefore, we can see how B. has three white molecules as well as three black molecules at the reactants side and after the chemical reaction there are two molecules having a total of three of each molecule at the products side unlike the other choices; for that reason the correct answer is B.
Best regards!
HELP NOW Do Now 3.5 Purple
Do Now 3.5 Purple
POSSIBLE POINTS: 100
Why can I smell a chocolate bar even though it is a solid?
Read the description of the office mystery and write your prediction below.
On a warm afternoon, a Universal Space Agency office worker returned from lunch break and noticed the office smelled like chocolate.
She didn't see anything in the air, but she noticed her coworker was opening the wrapper of a solid bar of chocolate. Why can the
office worker smell the chocolate bar even though it is in solid form?
Sim
• 1. Use the Sim to determine if the molecules of a substance can be in two different phases at the same time.
• 2. Go through each substance and see if you can get it to exist in two phases at once.
Directions
Using evidence from the articles you have read as well as the Sim and other activities you have completed in this lesson, write down
your initial ideas about why this mystery occurred. Be ready to share your ideas.
В І
Answer:
The smell of a chocolate is from the presence of volatile compounds present in the chocolate bar which at room temperature readily changes phase from solid to liquid to vapor or gas
Explanation:
There are nearly 600 identified compounds present in a chocolate bar and out of these, there are volatile components which gives the chocolate bar its distinctive aroma.
These volatile chocolate contents readily change phase from solid to vapor, with very short duration liquid phase.
For example, 3 methylbutanal, vanillin, and several organic compounds which are known to be readily volatile.
help plz ill give extra points
Answer: i think its d sorry if im wrong
Explanation:
If you add one packet of sugar to your tea, and all of the sugar crystals dissolve without
settling down on the bottom of your glass, this solution is
Answer:
b
Explanation:
sugar crystals are amzing
What type of reaction is the following?
C2H 4(g) + 30 2(g) → 2 CO 2(g) + 2 H 20(g)
Answer:
combustion reaction
Explanation:
Cos Milky Said it. Milky Smart.
this organ has 2 parts, the cervix, which is the lower part that opens into the vagina, and the main body, called the corpus.
Answer:
The correct answer is - the uterus.
Explanation:
The uterus or the womb is an organ that appears to be pear-shaped and it is hollow from inside where the fetus is developed and it is also called the birth canal. The uterus has two parts one is the cervix and the other is the corpus.
The cervix makes the lower part of the uterus and opens up into the vagina the external reproductive organ of the females. The corpus is the part that makes the main body of the uterus. The uterus is present between the bladder and rectum where the egg fertilized and implanted itself.
______ have no definite shape, but definite volume
A. solids
B. liquids
C. gases
D. plasmas
Answer:
liquids
Explaination:
When 2 equal forces act on and object and the object generally doesn't move is
A. interia
B. unbalanced force
C. balanced force
D. speed
Answer:
a balanced force since the object isn't moving
hope this helped
Features passed from parent to offspring, such as eye color, is an example of what?
cathode rays are deflected by?
4. What is the volume, in liters, of a 3.00 mole sample of carbon dioxide at STP?
Answer:
One mole of ideal gas occupies 22.4L volume at STP
Explanation:
So., we treat carbon dioxide an ideal gas:
3 mol x 22.4L •Mol-¹ ≈? ?L