Answer:
T(initial) = 241.4˚C
Explanation:
∑q = q(metal) + q(water) = 0*
Q(metal) = (m∙c∙ΔT)Fe = 360g x 0.444j/g˚C x (45.7˚C – T(initial)) = 159.84j/˚C(45.7˚C – T(initial)) = 7304.69 j – 159.84j/˚C x T(initial)
Q(water) = (m∙c∙ΔT)water = 425g x 4.184j/g˚C x (45.7˚C - 24˚C) = 38,586.94 joules
∑[Q(metal) + Q(water)] = 7304.69j -159.84j/˚C x T(initial) + 38586.94j = 0
=> 159.84 x T(initial)j/˚C = 38586.94j
=> T(initial) = 38586.94j / 159.84j/˚C = 241.4˚C
____________________________________
*Initial equation is from Heat Loss = Heat Gained (Conservation of Energy) That is, Heat lost + (- Heat gained) = 0
=> ∑(heat loss by metal) + (- heat gained by water) = 0
using heat transfer equation with temperature change
=> mcΔT(metal) + (-mcΔT(water) = mcΔT(metal) - (mcΔT(water) = 0
Explain how the skeletal and muscular system work together to support body movement from this picture.
Answer:
Tendons connect the skeletal system to the muscular system by attaching muscle to bone. When muscle contracts, the tendon acts on the bone, causing movement. Joints, the point at which two or more bones connect, can be fixed, slightly movable, or freely movable.
What is the concentration if 20 grams of NaOH was dissolved in enough water to make a 250 mL NaOH solution?
Answer: 1 molar NaOH contains 40 grams of NaOH per every liter of water
Explanation:
so 2 M NaOH contains twice that amount, ie. 80 grams per liter. Then, ine 250 ml of weater, there should be 80/4 = 20 grams of solid NaOH dissolved.
Explain how the hypothalamus and certain endocrine glands work together to maintain the following conditions in the body. Specify the endocrine glands involve and the hormones it releases.
Answer:
Nerve cells in the hypothalamus make chemicals that control the release of hormones secreted from the pituitary gland. The hypothalamus gathers information sensed by the brain (such as the surrounding temperature, light exposure, and feelings) and sends it to the pituitary.
Explanation:
5. (10 Points) To calculate the heat released in the reaction you used the formula
q=cmAT. What do each of the symbols represent in the this formula?
Explanation:
To calculate the heat released in the reaction, we use the formula-
Q = m×c×Δt
Where
Q - The heat energy
m - the mass of the object/substance being heated
c - the specific heat of the object/substance being heated
Δt - the change in temperature in °C
im struggling and dont want to fail
Answer: Hey I am sure you will do great just try your best
Explanation:
40 points. Explain how a substituted hydrocarbon is made.
Answer: Organic acids form when a carboxyl group (−COOH) is substituted for one of the hydrogen atoms in a hydrocarbon.
Can someone explain the steps for balancing chemical equations in depth?
Answer:
Steps explained below
Explanation:
To explain balancing of chemical equations, I will make use of an example equation where Hydrogen and oxygen react to form water.
H2 + O2 = H2O
Now, the equation I've listed above is an unbalanced chemical equation. It can be balanced by the following steps;
Step 1: Identify the elements on both the left Hand side and the right hand side.
In this case;
on the left hand side, we have H and O.
On the right hand side, we have H and I also.
Step 2: Identify the number of atoms of each element on both the left and right hand sides.
On the left, H has 2 atoms and O has 2 atoms.
On the right, H has 2 atoms and O has 1 atom.
Step 3: For the equation to be balanced, the number of atoms of each element on the right and left hand side must be the same.
Thus,
O on the left hand side has 2 atoms but on the right hand side it has 1 atom. Thus, we will multiply O on the right by 2 to balance what we have on the left.
So, we now have;
H2 + O2 = 2H2O
Step 4: Check equation: We now have;
H2 + O2 = 2H2O
Our left hand side remains 2 atoms of H and 2 atoms of O. But on the right, we now have;
2 atoms O and 4 atoms of H.
Which means atoms of H is not balanced with the left side.
Step 5: rebalance equation: To rebalance, we multiply H on the left by 2 to give us 2 × 2 = 4 atoms.
Thus, we now have;
2H2 + O2 = 2H2O
Answer:
Representation of chemical reactivity by symbols follows two absolute rules:
Explanation:
1
.
Mass is conserved.
2
.
Charge is conserved.
What do we mean by this? If we start with 10 g of reactant FROM ALL SOURCES, AT MOST we can get 10 g of product; and in practice we are not even going to get that. Since mass is a fundamental property of atoms and molecules it follows that atoms and molecules are conserved in EVERY chemical reaction.
)
Because it is not balanced (why not?), we can reject it out of hand, because we know that it does not reflect reality.
)
80 g of reactant gives 80 g of product
...charge and mass are balanced here. And so this is a reasonable representation of reality.
I know I am being absolute when I say that charge and mass are conserved, but this reflects EVERY CHEMICAL REACTION, EVERY EXPERIMENT EVER PERFORMED: when a reaction is studied in detail,
garbage out has always equalled garbage in.
And how do we know that masses are conserved; that stoichiometry operates? How else but by experiment? How else but by extensive and quantitative study of particular chemical reactions?
Every chemical reaction ever performed (and as far we know, TO BE PERFORMED), displays conservation of mass. And today we have a particle view of chemical reactivity, and our ideas, developed over only some 200-300 years, insist that matter is conserved. That molecules and atoms themselves have discrete masses, which are certainly measurable, supports our notion of conservation of mass.
This idea can be extended to the representation of redox reactions, where we can invoke the electron as a charged particle that is exchanged between species in a redox process. Charge is conserved, as well as mass.
If this all seems a lot to take in, remember you will only be asked to balance equations to which you have already been introduced. Alkanes combust in air to give carbon dioxide and water, iron combines with oxygen to give rust,
If you can write a chemical equation that balances mass and charge, you have proposed a reasonable chemical pathway. See here for redox equations.
Explanation:
distinguish between climate and atmosphere.
what is called decomposition reaction question explain with chemical equation
Answer:
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
Explanation:
decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen
How many moles are in 7.777x 10^24 molecules of Mg2. Watch your significant
figures
Answer:
12.91 moles of Mg₂, 8.4x10²⁴ atoms of I.
Explanation:
The number of molecules of any chemical substance is converted to moles using Avogadro's number (That is 6.022x10²³ molecules / mol) :
7.777x10²⁴ molecules * (1mol / 6.022x10²³molecules) =
12.91 moles of Mg₂As you can see, there are 4 significant figures in the number of molecules and the answer of moles.
In the same way, 14 moles of I are:
14 moles I * (6.022x10²³ atoms / mol) =
8.4x10²⁴ atoms of IDecay chains exist because
radioactive elements remain radioactive regardless of decays.
radioactive elements require multiple decays in order to release all of their radiation.
radioactive elements can decay into stable or unstable elements.
radioactive elements require large amounts of time to decay to a stable element.
Answer:
Find the length of side x in simplest radical form with a rational denominator.
Answer:
The answer is C
radioactive elements can decay into stable or unstable elements.
How is a less-intense wave different from a more-intense wave?
Answer:
A less-intense wave will have fewer decibels than a more-intense wave.
Explanation:
sound is measured in units called decibels (dB). The higher the decibel level, the louder the noise. On the decibel scale, the level increase of 10 means that a sound is actually 10 times more intense, or powerful.
In order to solve Ideal Gas Law calculations, what unit must temperature be in? *
Fahrenheit (°F)
Celcius (°C)
Kelvin (K)
Atmospheres (atm)
Answer: Atm
I took a test and got it right.
how does farming affect or change Earth systems? Give at least 3 examples.
Answer:
1.Exhaust from farming machines pollutes the air
2.Cows give off methane gas that gets into the atmosphere
3.The land the farm was cleared away on effects other recosystems
Explanation:
Farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
How does farming affect or change Earth systems?Agriculture causes a number larger of environmental issues that cause environmental degradation such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
For example, exhaust from farming machines pollutes the air, Cows give off methane gas that gets into the atmosphere and the land the farm was cleared away on effects other ecosystems.
So we can conclude that farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.
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How many grams of SO2 can be produced if
2.5 moles of O2 are used?
S2 + 2O2 → 2SO2
Answer: mass of SO2 is 160 g
Explanation: according to equation number of moles of SO2
Is same as amount of Oxygen, also 2.5 moles.
Molar mass of SO2 is 32.07 +2·16 = 64.07 g/mol
Mass is m= nM = 2.5 mol· 64.07 g/mol= 160.175 g
The term mole concept is used here to determine the mass of hydrogen. The mass of SO₂ produced from 2.5 moles of O₂ is 160.165 g.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The balanced reaction is given as:
S₂ + 2O₂ → 2SO₂
2 mole O₂ = 2 mol SO₂
Number of moles of O₂ = 2.5
Moles of SO₂ = 2.5 × 2 / 2 = 2.5 mol
The molar mass of SO₂ = 64.066 g/mol
Mass of SO₂ = 64.066 × 2.5 = 160.165 g
Thus the mass of SO₂ is 160.165 g.
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This sea grass has had the sun shining on it for most of the day. What can the sea grass do because it is in sunlight? What does this mean for the number of energy storage molecules in the sea grass?
The sea grass can
Answer:
I don't really get your question but I think my answer relates to your question :)
Explanation:
Due to the high availability of sunlight, sea grass can get the sufficient light energy to carry photosynthesis and storage of energy.
What is photosynthesis ?Photosynthesis is a biochemical process by which green plants synthesis energy and in the leaves by the aid of light energy. Here, the light energy is converted to chemical energy.
Plants need sunlight for the light reaction of photosynthesis. In the absence of sunlight, they cant synthesis energy and the chlorophyll does not get active. They will grow towards sunlight.
The sea grass are getting sufficient light energy for the synthesis of energy. The energy storage molecules ie. ATP in sea grass will be synthesized in higher rate with the presence of sun shining.
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Which gas law would you use if pressure remains constant? *
Boyle's Law
Charles's Law
Gay-Lussac's Law
Combined Gas Law
Answer:
vfv
Explanation:
Answer:
boyle's law
Explanation:
what is the difference between isotopes and allotrope not more than three line
Answer:
An allotrope is one way that atoms can be arranged in a solid. An isotope is one way that protons and neutrons can form the same atomic element.
do you really get 7 years of bad luck if you crack a mirror :(
Answer:
nope its a myth don't worry :)
WILL GIVE BRAINLIEST
Calculate the number of moles of AL2O3 that are produced when 0.25 moles of fe is produced
2AL(s) + 3FeO(s)-----> 3Fe(s)+ Al2O3(s)
Which gas will have the greatest volume at STP?
A) 22.4 L of nitrogen gas
B) 5 g of hydrogen gas
C) 1 mole of helium
D) 10 g of oxygen gas
Answer:
1 mole of Helium is answer
20g of butanedioic acid were shaken with a mixture of 100 cm3 ether and 100 cm3 water at 298K. After titration with standard sodium hydroxide, it was noted that the ether layer needed 12.4mL of 0.2 mol dm-3 solution for complete neutralisation. Calculate the partition co-efficient.
Answer:
I'm Not Good At Chemistry.
Explanation: It's Hard.
One molecule of a compound weighs 2.93 10–22 g. The molar mass of this compound is:
A)
2.06 g/mol
B)
567 g/mol
C)
168 g/mol
D)
176 g/mol
E)
none of these
Answer:
176 g/mol
Explanation:
To get this, multiply the weight of the molecule by Avogadro's number:
(2.93×[tex]10^{-22}[/tex]) × (6.022×[tex]10^{23}[/tex]) = 176.44 g/mol
im planning to tell a girl i like her how should i do it?
please answer! will mark brainiest for correct answer!
Answer:
when the electron moves from the first orbit to the third it gains energy but when it jumps from a higher energy orbit to a lower the energy is being radiated. So whihever is the higher energy you know what it is.
Explanation:
Answer: So ever is the higher energy you know what it is.
Explanation:
How many grams of water can be vaporized by 2.153 kJ of energy?
Answer:
That is, water has a high heat of vaporization, the amount of energy needed to change one gram of a liquid substance to a gas at constant temperature. Wate
Explanation:
How many moles are in 558 grams of Hydrofluoric acid? please show dimensional analysis
Answer:
29.4mol
Explanation:
Using mole = mass ÷ molar mass
Molar mass of HF (hydrogen fluoride) = 1 + 19 = 20g/lol
Using the formula;
Mole = mass/molar mass
Mole = 588/20
Mole = 29.4mol
state the reason why the liebig condenser should be slanting and not horizontal?
Answer:
Explanation:I hope it help:)
Instead of being utilized horizontally, the Liebig condenser is frequently tilted because this promotes greater cooling and circulation of the cooling fluid.
What is Liebig condenser?A popular condenser used in chemistry to cool and condense heated vapor or gas into liquid form is the Liebig condenser.
It is constructed with an inner tube that allows hot vapor or gas to pass through and an outer jacket that allows cooling fluid, such water, to flow through in order to condense the vapor or gas.
Slanted condensers allow cooling liquid to pass through the outer jacket more freely, improving heat transfer and increasing cooling effectiveness.
Therefore, it provides for better cooling and circulation of the cooling fluid, the Liebig condenser is often utilized in a tilted position as opposed to a horizontal one.
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and a 40N Torce in a southeriy direction?
4. A car works harder to accelerate from 0 to 10km/hr than it does to maintain a 10km/hr speed. Why is this? A. b/c
static friction is harder to overcome than kinetic or rolling friction. B. b/c static friction is easier to overcome than
kinetic or rolling friction. C. b/c static friction is harder to overcome than potential energy. D. b/c static friction is
easier to overcome than gravity.
Answer:
I Don't Know.
Explanation: I'm Sorry, But I'm Not Good At This Subject. Atleast I'm Being Honest.
CHEMISTRY QUESTION 20 pts.... URGENT
Answer:
E i is like Math so I think this will help you
