Answer: The answer is C
Explanation:
All minerals are made up of ____________(elements or rocks).
Answer:
elements
Explanation:
What causes the trade winds?
Answer: Trade winds are caused by the strong warming and evaporation within the atmosphere around the equator. (1) Around the equator, the warm air rises rapidly, carrying a lot of moisture.
Answer:
The Coriolis Effect.
Explanation:
combination with an area of high pressure, causes the prevailing winds—the trade winds—to move from east to west on both sides of the equator across this 60-degree "belt.
How many atoms are in 3.75 mol of calcium?
Answer:
Number of atoms = 22.58×1023
Explanation:
How much heat is needed to raise the temperature of 55.0 g sample of water by 65.0 oC.
The specific heat of water is 4.18 J/g oC. (Q = mxcx AT)
PLEASE HELP
Final answer:
To raise the temperature of a 55.0 g sample of water by 65.0°C, 14943 joules of heat energy is required, calculated using the specific heat capacity of water and the formula for heat energy.
Explanation:
The student asks about the quantity of heat energy needed to raise the temperature of a given sample of water. To calculate this, we will use the formula Q = m × c × ΔT, where 'Q' is the heat energy in joules (J), 'm' is the mass of the water in grams (g), 'c' is the specific heat capacity (4.18 J/g°C for water), and 'ΔT' is the change in temperature (°C).
In this scenario, the mass of water is 55.0 g, and we want to heat it by 65.0 °C. Therefore, we calculate the heat energy required as follows:
Q = 55.0 g × 4.18 J/g°C × 65.0 °C
Q = 55.0 × 4.18 × 65.0
Q = 14943 J
So, 14943 joules of heat energy is required to raise the temperature of a 55.0 g sample of water by 65.0°C.
How many calories must be absorbed by 20.0 g of water to increase its temperature from 383.0 C to 303.0 C
Answer:
1600 calories
Explanation:
Data obtained from the question include:
M (mass of water) = 20g
T1 (initial temperature) = 383°C
T2 (final temperature) = 303°C
ΔT (change in temperature) = T1 - T2 = 383 - 303 = 80°C
C (specific heat capacity of water) = 1 calorie/g°C
Q (heat) =?
Using the the equation Q = MCΔT, the heat in calories absorbed by the water can be obtained as follow:
Q = MCΔT
Q = 20 x 1 x 80
Q = 1600 calories
Therefore, the heat absorbed by the water is 1600 calories
How many grams of O2 are needed to produce 0.400 mole Fe2O3 in the following reaction?
4 Fe(s) + 3 028 2 Fe2O3(s)
Answer
7.2 g of Oxygen are needed to produce 0.400 mole Fe₂O₃ in the following reaction
Explanation:
4 Fe(s) + 3O₂= 2 Fe₂O₃(s)
4 moles of Fe reacts with 3 moles of oxygen to give 2 moles of Fe₂O₃
to get the grams of oxygen needed to produce 0.400 mole Fe₂O₃ in the following reaction
we first get the moles then convert it to grams
3 moles of oxygen are needed to give 2 moles of Fe₂O₃ in the equation thus we have 3:2
let the represent the moles of oxygen that will be intended for 0.400 mole Fe₂O₃ in the following reaction
x:0.4
3:2=x:0.4
3/2 = x/0.4
cross multiply
3x0.4 = 2x
1.2 = 2x
x= 1.2/2 = 0.6
moles is 0.6
1 mole of Oxygen is 12g of Oxygen
0.6 mole of oxygen will give = 0.6 x12= 7.2 g of Oxygen
7.2 g of Oxygen are needed to produce 0.400 mole Fe₂O₃ in the following reaction
To produce 0.400 moles of Fe₂O₃, 95.8 g of O₂ are needed.
Let's consider the following balanced equation.
4 Fe(s) + 3 O₂(g) ⇒ 2 Fe₂O₃(s)
We can calculate the grams of O₂ needed to produce 0.400 moles of Fe₂O₃ considering the following relationships.
The molar mass of Fe₂O₃ is 159.69 g/mol.The molar ratio of Fe₂O₃ to O₂ is 2:3.[tex]0.400molFe_2O_3 \times \frac{159.69gFe_2O_3}{1molFe_2O_3} \times \frac{3molO_2}{2molFe_2O_3} = 95.8 gO_2[/tex]
To produce 0.400 moles of Fe₂O₃, 95.8 g of O₂ are needed.
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How many grams of O₂ are needed to produce 0.400 mole Fe₂O₃ in the following reaction?
4 Fe(s) + 3 O₂(g) ⇒ 2 Fe₂O₃(s)
How many grams of magnesium(Mg, 24.30 g/mol) are in 7.43×10^22 atoms Mg?
Final answer:
To find the number of grams of magnesium in 7.43×10²² atoms, convert the number of atoms to moles and then to grams using the molar mass of magnesium.
Explanation:
To calculate how many grams of magnesium are in 7.43×10²² atoms of Mg, you need to convert the number of atoms to moles and then to grams. The molar mass of magnesium is 24.30 g/mol, which means that one mole of magnesium atoms weighs 24.30 grams.
First, calculate the number of moles of magnesium using the Avogadro's number and the given number of atoms: (7.43×10²² atoms) / (6.02×10²³ atoms/mol) = 0.123 moles of Mg.
Next, multiply the number of moles by the molar mass to get the grams of magnesium: 0.123 moles × 24.30 g/mol = 2.992 grams of Mg.
Given the balanced ionic equation:
3Pb2+(aq) + 2Cr(s) ---> 3Pb(s) + 2Cr3+(aq)
what is the number of moles of electrons gained by 3.0 moles of lead ions?
1. 5.0 mol
2. 2.0 mol
3. 3.0 mol
4. 6.0 mol
Answer : The correct option is, (4) 6.0 mol
Explanation :
The given balanced chemical equation is,
[tex]3Pb^{2+}+2Cr\rightarrow 3Pb+2Cr^{3+}[/tex]
In this reaction, lead undergoes reduction and chromium undergoes oxidation.
Oxidation reaction : It is the reaction in which a substance looses its electrons. In this oxidation state increases.
Reduction reaction : It is the reaction in which a substance gains electrons. In this oxidation state decreases.
Half reactions of oxidation-reduction are :
Oxidation : [tex]2Cr\rightarrow 2Cr^{3+}+6e^-[/tex]
Reduction : [tex]3Pb^{2+}+6e^-\rightarrow 3Pb[/tex]
From the reduction reaction, we conclude that 6 moles of electrons gained by the 3 moles of lead ions.
Hence, the correct option is, (4) 6.0 mole
Assuming all the substances below have the same mass, which substance
below requires the least energy to raise its temperature by 7°C? Use the table
to help you answer the question.
Substance
Specific Heat
J/(kg )
900
Aluminum
Gold
Water
4.184
Wood
O
A. Gold
O
B. Aluminum
O C. Wood
O
D. Water
Answer:
Gold.
Explanation:
The specific heat is the measure to determine which material needs a lesser amount of energy to rise its temperature. Specific heats are described below:
Aluminium: [tex]903\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
Gold : [tex]129\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
Water: [tex]4184\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
Wood: [tex]1300\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
Gold reports the lowest specific heat and, hence, requires the least energy to raise its temperature 7°C.
What 3 things must occur for a reaction to successfully take place
Answer:
So, the three conditions for a chemical reaction to occur are: Temperature should be above absolute zero. Chemical reactants must be in close, proximate, physical contact. The reaction must have negatie free energy (exergonic) and the system must provide it sufficient energy to overcome the Activation Energy Barrier.
Punnett Squares represent the probability of traits in offspring as a result of what type of
reproduction?
A sexual
B asexual
C both
D neither
Answer:
A
Explanation:
B is incorrect because asexual reproduction produces an offspring exactly the same as it's parent. Thus the probability does not need to be calculated.
C and D logically do not make sense since B is incorrect and A is correct. I provided the explanation why it is incorrect above.
Thus A is the correct answer.
_________________________________________________
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What happened as Leah and Isaac moved down the small slope from point C to D?
A.
Their kinetic energy decreased.
B.
Their kinetic energy changed to potential energy.
C.
Their potential energy increased.
D.
Their potential energy changed to kinetic energy.
Answer:
D
Explanation:
As you move down anything, towards the earth, (gravitational) potential energy decreases. This eliminates options B and C.
By the law of conservation of energy, the energy of the system stays the same. However the energy may be converted into different forms. In this case, the potential energy is converted into kinetic energy - this is what makes people move faster as they go down the slope. This makes option A wrong and option D right.
Mrs. Jacobson is pushing a fridge to the right with a force of 100 N. The force pushing it
to the left is 15 N. What is the net (leftover) force on the fridge?
85 N to the right
85 N to the left
115 N to the right
115 N to the left
Answer:
A
Explanation:
Let's illustrate this; see the attachment.
We see that Mrs. Jacobson is pushing to the right with a force of 100 N and there is another opposite force pushing with a force of 15 N. Since these are in opposite directions, we can say that the force opposite to Mrs. Jacobson is pushing the fridge -15 N to the right (instead of 15 N to the left).
The net force would then be:
100 N + (-15 N) = 85 N to the right
The answer is A.
Answer:
85 N to the right
Explanation:
Convention: rightwards positive
Force applied by Mrs. Jacobson:
+100
Force applied by the fridge:
-15
Net force
+100 - 15
+85
_______________ is when a compound containing carbon and hydrogen (and sometimes oxygen) combines with oxygen gas to produce carbon dioxide and water. *
Fill in the blank:
synthesis
decomposition
combustion
single replacement
double replacement
Answer:
C. Combustion
Explanation:
Combustion- an organic compound containing carbon, hydrogen and sometimes oxygen reacts with oxygen gas to form carbon dioxide and water.
Name the ions in water acidified with dilute sulphuric acid
Answer:
H + ions are attracted to the cathode , gain electrons and form hydrogen gas. OH - ions are attracted to the anode , lose electrons and form oxygen gas.
Water forms according to the equation below:
2H2(g) + O2(g) -> 2H2O(g) ΔHrxn = -483.64 kJ
How much energy is released during the formation of 1 mol H2O(g)?
__kJ
Answer:
241.82 kJ is released
Explanation:
The reaction indicates that 483.64 kJ of energy is released when TWO moles of H2O(g) is formed. You're looking to find the amount of energy released when only ONE mole of H2O forms, so that would be half the amount of energy released in the reaction (as one mole is a half of two).
483.64 / 2 = 241.82 kJ
So, your answer would be 241.82 kJ is released.
The formation of 1 mole of water (H_2O) in the given chemical reaction releases 241.82 kJ of energy.
The reaction described in the question, 2H_2(g) + O_2(g) -> 2H_2O(g) with ΔHrxn = -483.64 kJ, shows that the formation of 2 moles of water (H_2O) releases 483.64 kJ of energy.
It's an exothermic reaction, meaning energy is released. That said, if we want to find out the amount of energy released during the formation of 1 mole of water, we divide the total energy by 2.
Thus, the formation of 1 mole of water (H_2O) releases 483.64 kJ / 2 = 241.82 kJ of energy.
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4. A solution contains 4.5 x 10^-5 M HCl. Determine the following:
a. [H3O+] b. [OH-] c. pH
Answer:
[H3O+] = 4.5 x 10^-3 M
[OH-] = 1.0 x 10^-14 / 4.5 x 10^-3 =2.2 x 10^-12 M
pH = - log [H3O+]= - log 4.5 x 10^-3 =2.3
A solution contains 4.5 × 10⁻⁵M HCl so the concentration of hydronium ion is 4.5 × 10⁻⁵M, pH of the solution is 4.34 and concentration of hydroxide ion is 2.2 × 10⁻⁸M.
How do we calculate pH?pH of any solution will be calculated as pH = -log[H⁺], where
[H⁺] = concentration of H⁺ or H₃O⁺ ion
Given concentration of HCl = 4.5 × 10⁻⁵M
HCl is a strong acid so that it completely dissociates into their ions as:
HCl → H⁺ + Cl⁻
From the stoichiometry, 1 mole of HCl produces 1 mole of H⁺ ion.
Concentration of H⁺ ion = 4.5 × 10⁻⁵M
Now we calculate pH by using the concentration value as:
pH = -log(4.5 × 10⁻⁵)
pH = -(-4.34) = 4.34
Also we know the relation:
[H⁺][OH⁻] = 10⁻¹⁴
[OH⁻] = 10⁻¹⁴ / 4.5 × 10⁻⁵ = 2.2 × 10⁻⁸M
Hence required values are (a)4.5 × 10⁻⁵M, (b)4.34 and (c)2.2 × 10⁻⁸M.
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ehensive Science 3 B -IC
Theo mixes cake batter and places it in the oven at 350°F
for 45 minutes. Explain what type of reaction baking a
cake represents in terms of energy.
Answer:
Endothermic reaction
Explanation:
Baking a bake batter in an oven is a typical endothermic reaction because it absorbs heat to drive a chemical change.
The heat changes that accompanies a chemical reaction can be categorized as either exothermic or endothermic.
Exothermic changes are changes in which heat is liberated to the surrounding. The surrounding becomes hotter at the end of such change. Burning of fuel and wood is one of such example. Endothermic changes are those that absorbs heat from the surrounding. The surrounding become colder at the end of the changes.In baking a cake batter, the oven furnishes it with a high temperature which drives a chemical change there in. This kind of reaction that absorbs energy from the environment is an endothermic reaction.
Answer:
Sample Response: Baking a cake requires heat to be applied to the batter in order for it to cook and chemically change into cake. The energy or heat applied is absorbed by the ingredients, so this represents an endothermic reaction.
Compare and contrast the burning of wood and the metabolism of glucose in your cells. How are they similar, and how are they different?
Burning of wood is a combustion reaction and the metabolism of glucose in your cells is cellular respiratory reaction.
Cellular respiration releases stored energy in glucose molecules and converts it into a form of energy that can be used by cells.
Cellular respiration is the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water.
Wood as well as many common items that combust are organic (i.e., they are made up of carbon, hydrogen and oxygen). When organic molecules combust the reaction products are carbon dioxide and water (as well as heat)
Similarities:
1. Combustion reaction and metabolism of glucose both require oxygen.
2. Combustion and metabolism of glucose both product carbon dioxide and water
3. Both produces by-products: After cellular respiration and combustion have gotten what they needed from the wood, there will be byproducts from the conversion. In the case of combustion, they are noxious gases like carbon monoxide. In the case of respiration, the sugar molecule is broken into two molecules of pyruvic acid.
4. Catalyst: While breaking apart the bonds to release the stored energy either combustion or sugars for respiration the bonds will not broken by themselves. In each case, a catalyst is required to start the reaction that will break the bonds apart. In the case of combustion, the catalyst is a spark. Wood are flammable, so the spark will ignite the burning, breaking apart the bonds and releasing the energy. For respiration, enzymes are used to break the sugar molecule apart.
Differences
1. Glucose metabolism produces a chemical energy, while combustion produces light and heat energy.
2. Glucose metabolism is an endothermic reaction while combustion is an exothermic reaction (produces heat)
What is the Law of Conservation of Mass? 60g + 40g = 100g
Answer:
100g like you answered it yourself
Explanation:
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. The total mass of reactant must be equal to total mass of product.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.
Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. Another postulated that was given by Antoine Lavoisier is the role of oxygen in combustion reaction. total mass of reactant must be equal to total mass of product.
Therefore, the total mass of reactant must be equal to total mass of product.
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According to the map shown, why is geothermal renewable energy resource more often used west of the Mississippi River?
A)
Geothermal energy requires high subsurface temperatures that can found east of the Mississippi River.
B)
Geothermal energy requires lower subsurface temperatures that can found east of the Mississippi River.
C)
Geothermal energy requires high subsurface temperatures that can be found west of the Mississippi River.
D)
Geothermal energy requires lower subsurface temperatures that can be found east of the Mississippi River.
Answer:
C) Geothermal energy requires high subsurface temperatures that can be found west of the Mississippi River.Answer: C) Geothermal energy requires high subsurface temperatures that can be found west of the Mississippi River.
Explanation: i took the usa test prep and got it right!!
What happens to the equilibrium shift when NaOH is added to ammonium?
Answer:
I believe it goes to the left
Explanation:
GOOGLE it or ask me for more questions :)
PLEASEEEE HELPPPP I BEGG FOR HELPPP PLEASE
________________ are powered by redox reaction.
A) diesel engines B) steam engines C) rocket engines D) gasoline engines
Answer:
I beleive its diesel engines
Explanation:
The positive and negative ions in two compounds switch places is ______________ *
fill in the blank:
synthesis
decomposition
combustion
single replacement
double replacement
Answer: double-replacement reaction
Explanation:
How many moles are equal to 5.82 x 10^23 atoms of tungsten (w)
Answer:
0.97 mole
Explanation:
1 mole will give 6.02×10^23 atoms
Xmole of tungsten will give 5.82×10^23 atom of tungsten
X= 5.82×10^23/ 6.02×10^23
X = 0.97 moles of tungsten
Answer:
0.967 moles
Explanation:
number of moles = number of atoms / avogadro's number
We are given;
Number of atoms = 5.82×10^23
Avogadro's number = 6.02×10^23
Therefore, number of moles
= (5.82×10^23)/(6.02×10^23)
=0.967mol
Therefore, 0.967 moles are equal to 5.82×10^23 atoms
I need help ASAP!!!
All organisms are made up of _________, the basic unit of structure and function.
_________ is the ability to do work and allows living things to perform all the functions necessary to live.
Answer:
cells; energy
Explanation:
Answer:
All organisms are made up of cells, the basic unit of structure and function. Homeostasis is the ability to do work and allows living things to perform all the functions necessary to live.
Explanation:
Cells are the building blocks of all life and make up the structure and allow an organism to function properly. Homeostasis defines the second term. Hope this helps, have a great one!
How many moles are contained in 1.44 x 10^23 molecules of water?
Answer:
There are 0.239 moles of water in 1.44 x 10^23 molecules
Explanation:
We use the Avogadro´s Number, whereby in 1 mole of any substance there are 6, 023x10e23 molecules:
6, 023x10e23 molecules-----1 mol water
1.44 x 10^23 molecules -----x=
x= ( 1.44 x 10^23 molecules x 1 mol water)/6, 023x10e23 molecules
x=0,239 mol water
4.How many grams of NaCl would need to be added to 1001 g of water to increase the boiling temperature of the solution by 1.500 °C? (Kb for water is 0.5100 °C/m)
5. A solution is made using 80.1 g of toluene (MM = 92.13 g/mol) and 80.0 g of benzene (MM = 78.11 g/mol). What is the molality of the toluene in the solution?
Answer :
(4) The mass of NaCl needed would be, 172.2 grams.
(5) The molality of toluene in the solution is, 10.9 mol/kg
Explanation :
Part 4:
[tex](K_b)[/tex] for water = [tex]0.5100^oC/m[/tex]
[tex]\Delta T_b=1.500^oC[/tex]
Mass of water (solvent) = 1001 g = 1.001 kg
Molar mass of NaCl = 58.5 g/mole
Formula used :
[tex]\Delta T_b=i\times K_b\times m\\\\\Delta T_b=i\times K_b\times\frac{\text{Mass of NaCl}}{\text{Molar mass of NaCl}\times \text{Mass of water in Kg}}[/tex]
where,
[tex]\Delta T_b[/tex] = change in boiling point
i = Van't Hoff factor = 2 (for NaCl electrolyte)
[tex]K_b[/tex] = boiling point constant for water
m = molality
Now put all the given values in this formula, we get
[tex]1.500^oC=2\times (0.5100^oC/m)\times \frac{\text{Mass of NaCl}}{58.5g/mol\times 1.001kg}[/tex]
[tex]\text{Mass of NaCl}=172.2g[/tex]
Therefore, the mass of NaCl needed would be, 172.2 grams.
Part 5:
Formula used :
[tex]\text{Molality}=\frac{\text{Mass of toluene}\times 1000}{\text{Molar mass of toluene}\times \text{Mass of benzene (in g)}}[/tex]
Given:
Mass of toluene = 80.1 g
Mass of benzene = 80.0 g
Molar mass of toluene = 92.13 g/mol
[tex]\text{Molality}=\frac{80.1g\times 1000}{92.13g/mole\times 80.0g}=10.9mole/kg[/tex]
Therefore, the molality of toluene in the solution is, 10.9 mol/kg
The heat of vaporization AHv, of ammonia (NH3) is 23.4 kJ/mol. Calculate the change in entropy AS when 23. g of ammonia boils at -33.5 °C.
Be sure your answer contains a unit symbol and the correct number of significant digits.
Answer:
ΔS(23g NH₃) = 132.2 j/K ≅ 130 j/K (~2 sig. figs. based on 2 sig. figs. in 23 grams NH₃).
Explanation:
Given ΔHv(NH₃) = 23.4 Kj/mol = 23,400 joules/mole
T = -33.5°C = (-33.5 + 273)K = 239.5K
molar ΔS (at boiling) = ΔHv/T = 23,400 j/mol / 239.5K = 97.70 j/mol·K
ΔS(23g NH₃) = molar ΔS (at boiling) x (moles NH₃) = 97.70j/mol·K x (23g/17g·mol⁻¹) = 132.2 j/K ≅ 130 j/K (~2 sig. figs. based on 2 sig. figs. in 23 grams NH₃).
The change in entropy when 23 g of ammonia boils at -33.5 °C is 0.178 kJ/K. To find this, the mass of ammonia was converted to moles, the given temperature was converted to Kelvin, and then the heat of vaporization was divided by the temperature.
Explanation:To calculate the change in entropy (ΔS) when 23 g of ammonia boils at -33.5 °C, we'll use the heat of vaporization (ΔHv) of ammonia, which is 23.4 kJ/mol. First, we convert the given mass of ammonia to moles by using its molar mass (17.03 g/mol for NH3). This gives us:
23 g / 17.03 g/mol = 1.351 moles of ammonia.
Next, we use the formula ΔS = ΔHv / T, where T is the temperature in kelvin.
Since the boiling occurs at -33.5 °C, we first need to convert this temperature to Kelvin:
T = -33.5 °C + 273.15 = 239.65 K.
The total change in entropy for the vaporization of ammonia is then:
ΔS = (23.4 kJ/mol × 1.351 mol) / 239.65 K,
ΔS = 31.61 kJ / 239.65 K = 0.1318 kJ/K × 1.351 = 0.178 kJ/K (or 178 J/K).
This is the change in entropy for the given amount of ammonia with the correct number of significant digits and units.
Are 3 eggs the same quantity as 3 dozen eggs ?
Answer:
a dozen eggs is 12 eggs. Three dozen is 36 eggs. so no
Explanation: