Heat required = = 126.42 kJ
Further explanationGiven
1.96 mol NaHCO₃(s)
Required
Heat needed
Solution
Reaction( decomposition of Baking soda (NaHCO₃) :
2NaHCO₃ (s) + 129 kJ ⇒ Na₂CO₃ (s) + H₂O (g) + CO₂ (g)
For 2 mol NaHCO₃ , heat needed = 129 kJ
conversion factor :
[tex]\tt \dfrac{129~kJ}{2~mol}[/tex]
So for 1.96 mol :
= 1.96 mol x (129 kJ/2 mol)
= 126.42 kJ
how many atoms are in each compound ?
2NaCl
H5NO
5NH4C
4Bl
Answer:
i didint understand your question
- How many moles of S2 are needed to produce 1.50 moles of SO2 gas? S2 + 20, ----> 2802
Answer:
0.75 moles
Explanation:
S2 + 2O2 = 2SO2
From the reaction above,
We see that number of moles attached to S2 is 1 and number of moles attached to SO2 is 2.
Since we want to find how many moles of S2 are needed to produce 1.50 moles of SO2 gas
The answer is gotten by proportion;
Number of moles = 1/2 × 1.5 = 0.75 moles
What general trend applies to solubility?
(a) Temperature is not related to solubility.
(b) As temperature goes up, solubility goes down.
(c) As solubility goes up, temperature goes down.
(d) As temperature goes up, solubility goes up.
Answer:
Basically, solubility increases with temperature. It is the case for most of the solvents. The situation is though different for gases. With increase of the temperature they became less soluble in each other and in water, but more soluble in organic solvents.
Jamal's class is observing how different substances are affected by physical and chemical changes. What evidence might indicate that a chemical
change has occurred? Choose the three correct answers.
A. release of heat
B. change in temperature
С. color change
D. new smell
The change in color might indicating the formation of a new product. Hence, the color change indicates a chemical change.
What is chemical change ?A chemical change involves the breaking/ making or both of chemical bonds. Chemical changes results in formation of new products that have different properties and structure from the initial substances.
A physical change include change in size, shape, state etc. All phase changes such as melting, boiling, freezing are physical changes. Evolution or absorption of heat, conductivity, solubility etc are physical changes.
A change in color indicates that a new product with different color is formed in the system. Therefore, option c color change indicates a chemical change.
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Science is the process of observing and making sense of the natural world.
True or False
research the Greenhouse effect and how it relates to heat transfer.
Answer:
The greenhouse effect is a phenomenon of radiative transfer, the process by which the energy of light waves is exchanged in matter. Radiative transfer dictates what energy is reflected, absorbed, and emitted. The greenhouse effect: A summary of the heat transfer in the Earth's atmosphere
Explanation:
trust me i have a huge brain and access to the internet
i need help with it please
Answer:
1. cells
2. energy
3. pre-existing cells by division
Explanation:
Answer:
1. All living things have 1 or more cell
2. All organisms use a source of energy
3. All cells come form other pre-exsisting cells
Explanation:
The liver is a group of tissues that produce bile that is used to break down fats. The liver is a(n) _____.
Answer:
Its food for cannibals.
How many protons, neutrons, and electrons do the following elements have? Ca, Na, U, Yt
Answer:
Ca- 20,20,20
Na-11,12,11
U-92,146,92
i dont know what the last one is
Explanation:
Convert 3.01 x 1023 atoms CU to moles
The number of moles = 0.5
Further explanationGiven
3.01 x 10²³ atoms Cu
Required
moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Input the value :
n = N : No
n = 3.01 x 10²³ : 6.02.10²³
n = 0.5
Determine the empirical formula of an oxide of silicon from the following: mass of crucible= 18.20g, mass of crucible +silicon =18.48g and mass of crucibe+ oxide of silicon =18.80g
Which is a non-living feature of the environment? A. Bacteria B.sun C. Fungi D. Cow
Answer:
B. Sun
Explanation:
While what exactly qualifies as "living" can be contested when talking about viruses, bacteria, etc. It is commonly accepted that Bacteria, Fungi and Animals (Cows) are all organisms. The Sun, however is no organism.
Which event may occur when ocean salinity increases?
mass of water increases
the freezing point of water increases
sunlight in deeper locations decreases
amount of dissolved gases in water increases
Answer:
The answer is C: “sunlight in deeper locations decrease”
Explanation:
C is the answer because the more salinity water has.. the harder it is to see and the harder it is for light to travel through the ocean.
Answer:
c
Explanation:
The red and yellow diamond in a NFPA sign represents what?
The red diamond tells how flammable the chemical compound is or how easily it catches fire.
The yellow diamond tells about reactivity how quickly the compound reacts with other materials.
If a plant cell is placed in a solution and the cell shrivels up, what type of solution was it placed in? How do you know?
Answer:
The cell is in a Hypotonic solution. When a cell is in a Hypotonic solution the lower osmotic pressure causing water to move across the pressure gradient into the solution causing the cell to shrivel.
Matter changes phase by:
1.particle interaction
2.particles moving closer or further away from one another
3.particles moving faster or slower
4.heat being added or released
Answer: 4.heat being added or released
Two people are pushing on a shopping cart from opposite sides. When will the motion of
the shopping cart change?
A. When the two forces are equal
B. When the forces acting on it are unbalanced
C. When both people stop applying a force
D. When the two people push with the same force
Answer:
The answer is B
The motion of the shopping cart will change when the forces acting on the shopping cart are unbalanced. Option B is correct.
According to Newton's first law of motion, an object will remain in its state of motion (either at rest or moving with a constant velocity) unless acted upon by an external force. In this case, the shopping cart is initially at rest or moving with a constant velocity due to the balanced forces exerted by the two people pushing it from opposite sides.
If the two forces applied by the people pushing the cart are equal the cart will continue to move in the same direction with the same velocity. The forces cancel each other out, resulting in a balanced force situation, and there is no change in motion.
However, if the forces applied by the two people pushing the cart are unequal, the forces are unbalanced. This will result in a net force acting on the shopping cart, causing an acceleration and a change in its motion. The cart will either start moving if it was initially at rest or change its speed and/or direction if it was already in motion.
When both people stop applying a force is incorrect because, the cart's motion will continue unchanged if it was already moving with constant velocity due to the absence of any unbalanced forces.
Hence, B. is the correct option.
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HELP ASAP PLSSS 3 AND 4
Answer:
both parents traits and genes
Answer this chemistry question below
WILL GIBE BRAINLIEST!!!!!! Think research, and discuss: As you move across a period, you will recall that
the radius decreases. Why do you think a decrease in atomic radius would
result in a greater ionization energy?
(5 Points)
The effective nuclear charge is increasing due to less distance between protons and
neutrons.
O
The effective nuclear charge is increasing due to less distance between protons and
electrons.
The effective nuclear charge is decreasing due to less distance between protons
and neutrons.
The effective nuclear charge is decreasing due to less distance between protons
and electrons.
stars evolve and change over time, what is something else on earth that changes over time? describe the similarities and differences
Answer:
Trees change over time.
Explanation:
In the summer, trees thrive on the nutrients the sunlight gives them. In the winter, their leaves change colors and they start to perish. Then, with a little bit of sunlight ad water, they can thrive again. Stars also start to perish at some point, but they do not thrive again. They continue perishing until they implode.
Does the following compound contain a polyatomic ion? VF5
Yes
No
Answer:
the answer is yes
Explanation:
I don't no
What mass of oxygen combines with 2.81 mol
of magnesium in the reaction
2 Mg(s) + O2(g) → 2 MgO(s)?
22.48 g. mass of oxygen combines with 2.81 mol of magnesium in the reaction. For the reaction 2 Mg(s) + O2(g) → 2 MgO(s).
What do you mean by molar mass ?The term molar mass is defined as the mass of 1 mole of that particular substance and number of grams per mole of a compound.
In other words, the molar mass is the total mass in grams of all the atoms that make up a mole of a specific molecule. As a result, the molar mass units are grams/mole.
The balance chemical equation is as follows :
2 Mg(s) + O2(g) → 2 MgO(s)
The metal Mg reacts with Oxygen in a 2:1 ratio you would divide 2.81 by two.
Now, we get,
2.81 / 2 = 1.405
You would then multiply 1.405 by the molar mass of Oxygen which is 15.999
= 1.405 × 16
= 22.48 g.
Thus, 22.48 g. mass of oxygen combines with 2.81 mol of magnesium in the reaction.
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Jimmy's Chemical reaction/ Recipe for making Grilled chese sandwiches is given below: 1 slice of cheese + 2 slices of bread = 1 Grilled chese sandwich ( mole ratio is, 1:2:1) If Jimmy has the following amounts of ingredients (reactants/ reagents) : 10 slices of cheese 30 hslices of bread Answer the questions below in your submission: a) What is the limiting reagent/reactant? b) what is the excess reactant? c) True or false? The number of glilled chese sandwishes he can make is decided by the limiting reactant because it gets used up most.
Answer:
See explanation
Explanation:
We have been told in the question that the equation of the reaction is; 1 slice of cheese + 2 slices of bread = 1 Grilled cheese sandwich ( mole ratio is, 1:2:1) .
Then the reagents are 10 slices of cheese 30 slices of bread. It then follows that 10 slices of cheese should be combined with 20 slices of bread according to the mole ratio.
However, we have 30 slices of bread and 10 slices of cheese so cheese is the limiting reactant while bread is the reactant in excess.
Yes, the number of glilled chese sandwishes he can make is decided by the limiting reactant because it gets used up most.
What step of the water cycle has the most direct impact on freshwater storage
Answer:
Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff.
Explanation:
Ethylene glycol (C2H6O2) is used as an antifreeze in cars. If 250 g of ethylene glycol is added to 3.00 kg of water, what is the molality? Calculate how much the freezing point of water will be lowered. The freezing-point depression constant for water is Kf = –1.86°C/m. Show your work.
Answer:
2,909 M
Explanation:
molair mass is of.ethylene is 26,04 g/mol
first you need to calculate how much mL 3 kg is. You can do this by using the density of ethylene: 1,1 g/mL.
3000 g x 1.1 = 3300 mL = 3,3 L
Next you need to calculate the amount of moles:
250 g / 26,04 g/mol = 9,60 mol
Now you can calculate the molarity:
9,6/3.3 = 2,909 M
I don't know the answer for the second question. I'm sorry.
which phrase best defines the term energy
Answer:
theres no options?
Explanation:
What components make up an environment?
Answer:
Environment mainly consists of atmosphere, hydrosphere, lithosphere and biosphere. But it can be roughly divided into two types such as (a) Micro environment and (b) Macro environment. It can also be divided into two other types such as (c) Physical and (d) biotic environment.
Explanation:
How many grams of Na2SO4 can be produced from 423.67 g of NaCl?
Mass of Na2SO4= 514.18 grams
Further explanationGiven
423.67 g of NaCl
Required
mass of Na2SO4
Solution
Reaction
2NaCl + H2SO4 → Na2SO4 + 2HCl
mol NaCl :
= 423.67 g : 58.5 g/mol
= 7.24
From the equation, mol Na2SO4 :
= 1/2 x mol NaCl
= 1/2 x 7.24
= 3.62
Mass Na2SO4 :
= 3.62 mol x 142,04 g/mol
= 514.18 grams
what elements can calcium nitrate be decomposed into
Answer:
when heated to incandescence, calcium nitrate decomp into /nitrogen oxide, calcium oxide and oxygen/
Explanation:
Answer:
Explanation:
Do you mean what elements is Ca(NO3)2 made from? I think that's what you mean. Every mol of Ca(NO3) contains
Ca = 1 mol
N = 2 mols
O6 = six moles of oxygen
