Answer:
2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
Explanation:
Given data:
Mass of sample = 142.1 g
Initial temperature = 25.5°C
Final temperature = 46°C
Specific heat capacity of Al = 0.90 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 46°C - 25.5°C
ΔT = 20.5°C
Q = 142.1 × 0.90 J/g.°C × 20.5°C
Q = 2621.75 j
Thus, 2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
Which statements are true of heterogeneous mixtures? check all that apply. they settle out. they exhibit the tyndall effect. their solutes and solvents appear as one. they exhibit brownian motion. they are evenly distributed mixtures.
The statements which are true about heterogeneous mixtures are they settle out, they exhibit the tyndall effect and they exhibit brownian motion.
What are heterogeneous mixtures?Heterogeneous mixtures are those mixtures in which composition of their constituent partiles are not identical or even, they may vary place to place.
In the heterogeneous mixtures, solutes are present unevenly in the solution and this uneven arrangement is also arises the brownian motion means the randon motion of the particles. And these mixtures also shows the tyndall effect as light passes through the suspended particles may get scattered. On placing these mixtures without any motion for a long time, then it may sometimes settle down at the bottom.Hence, options (1), (2) & (4) are correct.
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Answer:
A,B,D
Explanation:
i got it right
What are The factor(s) which help in the prediction of trends in the periodic
table
Answer:
number of protons in the nucleus, number of energy levels, and the shielding effect.
Explanation:
I hope this helps :)
which of the following apply to organic compounds. select all that apply.
A. Organic compounds cannot be synthesized.
B. Organic compounds contain carbon.
C. All organic compounds are products of living things.
D. Organic compounds can be synthesized.
C. All compounds that contain carbon are organic
Answer:
Organic compounds contain carbon
Organic compounds CAN be synthesized
Explanation:
A substance made of two or more atoms bonded together
Answer:
A substance made of two or more atoms bonded together is a compound.
I think...
A 25.0 g block of copper (specific heat capacity 0.380 j/g･°c) at 88.0 °c is placed into 500.0 g of water initially at 20.0 °c. what is the change in temperature (in °c) of the copper block? (the specific heat capacity of water is 4.184 j/g･°c).
The change in temperature (in °c) of the copper block placed into the water is 67.7 °C
How to determine the equilibrium temperature Mass copper (M꜀) = 25 gSpecific heat capacity of copper (C꜀) = 0.380 J/gºC Temperature of copper (T꜀) = 88 °CMass of water (Mᵥᵥ) = 500 gTemperature of water (Tᵥᵥ) = 20 °CSpecific heat capacity of the water = 4.184 J/gºC Equilibrium temperature (Tₑ) =?Heat loss = Heat gain
M꜀C(T꜀ – Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)
25 × 0.38 (88 – Tₑ) = 500 × 4.184(Tₑ – 20)
9.5(88 – Tₑ) = 2092(Tₑ – 20)
Clear bracket
836 – 9.5Tₑ = 2092Tₑ – 41840
Collect like terms
836 + 41840 = 2092Tₑ + 9.5Tₑ
42676 = 2101.5Tₑ
Divide both side by 2101.5
Tₑ = 42676 / 2101.5
Tₑ = 20.3 °C
How to determine the change in temperature of copper Temperature of copper (T꜀) = 88 °CEquilibrium temperature (Tₑ) = 20.3 °CChange in temperature (ΔT) =?ΔT = T꜀ – Tₑ
ΔT = 88 – 20.3
ΔT = 67.7 °C
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WILL GIVE BRAINLIEST! Which statement correctly describes the properties of bases?
Basic solutions are colored blue.
Bases generate [OH–] ions in solution.
Bases are solutions with a pH less than 7.
Bases do not have the ability to injure skin and eyes.
Answer:
Acids, Bases, and the pH Scale
The terms acid and base describe chemical characteristics of many substances that we use daily. Acidic things taste sour. Basic or alkaline things taste soapy. Strong acids are corrosive and strong bases are caustic; both can cause severe skin damage that feels like a burn. However, mild acids and bases are common and relatively harmless to us. What makes a substance acidic or basic? The following equation is a good place to start:
2 H2O ⇌ 1 H3O+ + 1 OH-
We begin with two water molecules, and move some hydrogen atoms around. One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule loses a hydrogen atom and therefore becomes negatively charged. H3O+ is called a hydronium ion, and it makes things acidic. OH- is called a hydroxyl ion and it makes things basic. However, in water, there is a balance between hydroniums and hydroxyls so they cancel each others' charges. Pure water is neither acidic or basic; it is neutral.
So how does something become acidic or basic? That happens when the hydroniums and the hydroxyls are out of balance. If there are more positively charged hydroniums than negatively charged hydroxyls, then the substance is acidic. If there are more negatively charged hydroxyls than positively charged hydroniums, then the substance becomes basic. pH actually stands for the "potential (or power) of hydrogen."
Note: Sometimes people write H+ as a shorthand for H3O+ and that can cause confusion, because sometimes when people write H+ they really do mean only H+ and not H3O+. Watch out for that, and ask for clarification!
When we dissolve acids in water, we create an excess of hydroniums. When we dissolve bases in water, we create an excess of hydroxyls. Here are two examples. Vinegar, a weak acid, has a chemical formula of CH3COOH. When dissolved in water, it becomes CH3COO- and H+. The H+ ions combine with water molecules to form H3O+ so the solution becomes acidic. Now let's look at lye, a strong base with the chemical formula NaOH (sodium hydroxide). If we add NaOH to water, it dissociates into Na+ and OH-. The sodiums don't do anything important, but the hydroxyls make the solution more basic.
One last question: Why are strong acids and strong bases so nasty? It's because they are out of balance. They either have too many positive charges and are looking for negatives to get back into balance, or they have too many negative charges and are looking for positives to get back into balance. This makes them very reactive with anything they contact. When the positives and negatives are in equal number, they neutralize each other
When large populations overpump aquifers, some wells can
A microwave oven has a power rating of 850 W.
If the microwave oven is turned on for 6 minutes, how much energy will use? Give me the simplest answer possible as for a yr6-8 student to understand.. please..
Answer:
Explanation:
Before we jump into it, I just want to point out that a microwave oven has two
power ratings. One is the amount of electrical power it takes from the wall outlet to do its job. The other is the "cooking power" it delivers into the chamber in the form of microwave radiation to heat the meatloaf. The utility power required from the wall outlet is always more than the cooking power radiated into the chamber.
But we didn't really need to go into all that in order to answer the question.
1 watt = 1 joule per second
1 minute = 60 seconds
(850 watts) x (1 (joule/sec) / watt) x (60sec/min) x (6 minutes) = 306,000 joules
What is common ion effect? Explain with reference to the Group 2 reagents.
The dissociation of a weaker acid can be suppressed or stopped by the addition of stronger acids which is known as common ion effect
Let's check about group || reagents
[tex]\\ \rm\rightarrowtail H_2S\longrightarrow H^++S^{2-}[/tex]
[tex]\\ \rm\rightarrowtail HCl \longrightarrow H^++Cl^-[/tex]
Here Hydrogen sulphide is neutralized by a stronger acid HCl
What number of moles of O2(g) is required to react with 3.6 mol SO2(g) in the following
reaction?
2SO2(g)+ O2(g) → →2SO3(g)
Answer:
first balance the equation:
2SO2+O2=2SO3. BALANCED EQUATION
find the ratio:
2:1:2. SO2:O2:SO3
5.0 moles of SO2 React
1/2×5.0 moles=2.5moles of O2 are needed
The 1.8 moles of the oxygen (O₂) gas are required to react with 3.6 mol SO₂(g).
What is the balanced chemical equation?A chemical equation is a way to represent a chemical reaction in terms of chemical symbols of the reactants and products. The equation in which the number of atoms of chemical substances (reactants and products) is equal on either side of the equation is known as a balanced chemical equation.
Balancing of a chemical equation must follow the law of conservation of mass. The total mass of the elements present on the reactant side must be equal to the total mass of elements present on the product side while obeying this law in a balanced chemical equation.
Given, the chemical equation of the formation of sulphur trioxide is:
2SO₂(g) + O₂(g) → 2SO₃(g)
From the above equation, we can say that the two moles of sulphur dioxide react with one mole of oxygen gas to form two moles of sulphur trioxide gas.
3.6 moles of the SO₂(g) react with moles of oxygen gas = 3.6/2 = 1.8 mol
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At a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 x 105. What is the value for the reverse reaction at the same temperature
The value of the equilibrium constant for the reverse reaction is 5 × 10⁻⁶.
Equilibrium constantThe equilibrium constant is the value of the reaction quotient at equilibrium.
Given that at a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 × 10⁵.
We require the equilibrium constant for the reverse reaction at the same temperature.
Equilibrium constant for reverse reactionLet K' be the equilibrium constant for the reverse reaction.
So, we have that K' = 1/K
Substituting the value of K into the equation, we have
K' = 1/K
K' = 1/(2.0 × 10⁵)
K' = 1/2.0 × 1/10⁵
K' = 0.5 × 10⁻⁵
K' = 5 × 10⁻⁶.
So, the value of the equilibrium constant for the reverse reaction is 5 × 10⁻⁶.
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Stephanie notices that the Moon rises at 7 PM local time in the east, over the peach tree in her garden. Where and when can she expect to see the Moon rise the next day?
A) At 8 P.M. in the same place
B) At 7 P.M. in the same place
C) At 6 P.M. in the opposite direction
D) At 7 P.M. in the opposite direction
Answer:
b
Explanation:
because they can't change over 1 day it's takes time
Answer:
b
Explanation:
How does a foam-filled winter coat help keep a person warm?
Answer:
It slows down the transfer of thermal energy from outside to inside the coat.
Explanation:
The molar mass of water (H2O) is 18. 0 g/mol. A sample of water has a mass of 18. 0 g. How many moles of water are contained in this sample? 1. 00 mole 18. 0 moles 36. 0 moles 324 moles.
1 mole of water are contained in the given sample of water of 18.00 grams.
How we calculate the moles?Moles of any substance will be calculated as:
n = W/M, where
W = given or required mass
M = molar mass
In the question given that,
Molar mass of water H₂O = 18 g/mole
Given mass of water H₂O = 18 grams
Now we put all these values in the above equation, we get
Moles of H₂O = 18 grams / 18 g/mole = 1 mole
Hence, option (1) is correct, i.e. 1 mole of water is present.
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Nitrogen gas and hydrogen gas react to produce ammonia according to the following equation.
N2 + 3H2 → 2NH3
The atomic mass of nitrogen is 14 g/mol. The atomic mass of hydrogen is 1 g/mol. When the reaction produces 68 grams of ammonia, how many grams of nitrogen were present initially?
A 4
B 56 ***
C 12
D 112
Specific Mass Conversions Quick Check:
It compares the mass of the products to the mass of the reactants.For every 3 moles of hydrogen gas, the reaction produces 2 moles of ammonia.5632 g/mol4The amount of nitrogen that would produce 68grams of ammonia = 56 g/mol
Calculation of amount of nitrogenThe atomic mass of nitrogen is = 14 g/mol
2 atoms of nitrogen = 2 × 14 = 28 g/mol
The molecular mass of ammonia produced from 28 g/mol of nitrogen = 2(14+ 3)
= 2 × 17
= 34g/ mol
if 28g of Nitrogen = 34g/mol of ammonia
xg of Nitrogen = 68g/mol of ammonia
Make X the subject of formula,
X ,= 28 × 68/34
X = 1904/34
X = 56 g/mol of Nitrogen
Therefore, 56 g/mol of Nitrogen were present initially.
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Mr. Davilla drinks 80 mL (milliliters) of water. How many liters is this? (1,000 mL = 1 L)
What are magnetic field lines and what do they do? Explain likes and opposites in this
Answer:
Attract Field lines that curve toward each other show attraction.
Explanation:
What is the mass of 0.80 moles of Mg? (1 point)
a
7.5 x 1023 grams
b
4.8 x 1023 grams
c
30 grams
d
19 grams
Answer:
m = 19 grams
Explanation:
Given that,
No. of moles, n = 0.8
The molar mass of magnesium, M = 24.305 u
We need to find the mass of 0.80 moles of Mg. We know that given mass to the molar mass is equal to no of moles. Let the mass is m. So,
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=0.8\times 24.305 \\\\m=19.444\ \text{grams}[/tex]
or
m = 19 grams
So, the mass of 0.8 moles of Mg is 19 grams.
What is the number of electrons in silicon-30
What technique would you use to separate alcohol from water?
please help!!!!!
Answer:
fractional distillation.
Explanation:
Why is the amount of base needed to neutralize an acid the same regardless of strength?
This is a simple concept that I can't seem to understand. Why will a strong acid neutralize as much base as a weak acid, if the acids are of the same volume and concentration? A strong acid will dissociate more in solution and thus have a greater number of H+ ions, as far as my understanding goes.
Why do you Think you weight less on Uranus than earth even though it is more massive planet ? 
Answer:
You would weigh less on Uranus than on Earth because Uranus is far less mass-ive and dense than the Earth. This means that there is less gravity. Therefore, you would weigh less.
Explanation:
Even though Uranus is bigger, it is less massive; that is, there is less mass that makes up the planet. The volume of the planet might be larger, but the actual amount of mass isn't.
By the way, you couldn't stand on Uranus. It's made of gas!
8. What causes the shielding effect to remain constant across a period? O The atomic radius increases.O Electrons are added to the same principal energy level. OElectrons are added to different principal energy levels. O The charge on the nucleus is constant.
The charge on the nucleus is constant.
Explanation:-The number of inner shell electrons being constant causes the shielding effect to remain constant across a period
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Thank you:)The equation below represents a chemical reaction.
Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g)
A 5.00-g sample of zinc is added to hydrochloric acid. The amount of hydrochloric
acid is sufficient to allow the zinc to react completely. What mass of hydrogen gas
does this reaction produce?
Answer:
0.0308 g
Explanation:
i got it right
The cell is the basic unit of life
and _____________________ in all organisms.
When a molecule can occupy the same active site as the substrate, a situation called __________________ can result.
Describe the properties of ammonium lauryl sulfate that make it a feasible surfactant. Properties can include strength, conductivity, solubility, reactivity, durability, and state of matter.
The properties of ammonium lauryl sulfate that make it a feasible surfactant is its solubility and being able to disrupt hydrogen bonding in water.
What is a Surfactant?They are used as detergents and emulsifiers through to their ability to reduce surface tension between substances.
Hydrogen bonds are the primary contributor to the high surface tension of water which is why their ability to disrupt it makes it to be a good surfactant.
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The molar mass of carbon dioxide is 44.0 g/mol. How many moles of CO2 are present in a 58.4 gram sample of CO2
Answer:
1.33 moles CO2
Explanation:
The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.
1 mol CO2
58.4 g CO2 x -------------------------- = 1.33 moles CO2
44.0 grams
The answer has three sig figs.
Janice needs to have a gastro-intestinal study. So she is given 375 mg of radiocontrast dye containing Barium-142. The half-life of Ba-142 is 10.6 minutes and its decay is followed by -ray. After one half -life, of Ba-142 remains . After 31.8 minutes , of Ba-142 remains . After half-lives, 11.7 mg of Ba - 142 remains . After minutes , 0.366 mg of Ba - 142 remains. Finally, after approximately 3.5 hours - half-lives , only 0.000358 mg remains . The dye is no longer visible to the Xray and Janice's study is over .
After one half life, 188mg
46.9 mg of Ba-142
After 5 half lives
After 106 minutes
20 half lives , only 0.000358 mg remains
Hope this helps
The given statement could be filled in as follows:
After one half-life, 188mg
46.9 mg of Ba-142 After 5 half-lives
After 106 minutes 20 half-lives, only 0.000358 mg remains.
What is half-life?Half-life is described as the meantime necessary of 1/2 of radioactive decomposition's sample to break up.
In the given study,
Amount of Radiocontrast dye [tex]= 375 mg[/tex]
Half-life [tex]= 10.6[/tex] minutes
Therefore,
The amount left post 1 half-life = 188 mg
Now,
The amount left post 5 half-lives [tex]= 46.9 mg[/tex]
Lastly,
The amount left post 20 half-lives [tex]= 0.000358 mg[/tex]
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