Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
Select the correct answer.
A compound has an empirical formula of C2H5. What is true about this empirical formula?
ОА It models the structure of the compound.
ОВ. It shows the ratio of elements in the compound.
Ос. . It gives the mass of each atom in the compound.
OD. It indicates the number of atoms in the compound.
O E. It describes only this one compound.
Answer: OB
Explanation:
The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .
Can magic 8 ball wash with water?
Ms. Kastenberg spilled a bottle of paint outside in the sun. Over time, the paint dried. This is because:
A
The paint reflected the energy from the light
B
The light was too strong for the paint
с
The sun removed energy from the paint
D
The paint absorbed the energy from the light
Answer:
I believe that the answer is the paint absorbed the energy from the light
Explanation:
The paint dried because the paint absorbed the energy from the light and the correct option is option D.
What is absorption of light?Light absorption is the process in which light is absorbed by matter and converted into energy. In an atom, electrons vibrate at a specific frequency – this is called the natural frequency.
If a wave of light hits a material in which the electrons are vibrating at the same frequency as the wave of light, the electrons will absorb the energy and convert it into vibrational motion.
This is why objects have different colours – different materials’ electrons will vibrate at different rates, and therefore absorb different frequencies of light.
Therefore, the paint dried because the paint absorbed the energy from the light and the correct option is option D.
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Calculate the potential energy of a block of mass of mass 0.3kg and at a height 2.6m above the ground.(take acceleration due to gravity:10m/s)
Explanation:
Mass (m)=0.3 kg
height(h)=2.6 m
acceleration due to gravity (g)=10m/s^2
Potential energy= MGH
=0.3×10×2.6
7.8 J
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help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)
Answer:
equal
Explanation:
Name the sub atomic particles in part Z of a boron atom give the relative charges of these sub atomic particles
Answer:
Neutrons and protons
Explanation:
There are three fundamental subatomic particles, these are;neutrons protons and electrons.
Ernest Rutherford successfully showed that every atom does possess a central core that contain positively charged particles (protons) called the nucleus. Chadwick later discovered the existence of neutrons.
Both protons and neutrons are found in the nucleus. Z represents the nucleus of the boron atom and houses the neutrons and protons of the boron atom.
a compound formed when atoms of two or more different elements share electrons
a compound formed when atoms of two or more different elements share electrons
This statement is true.
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Imagine that you are Andreas Vesalius. Write a short autobiographical statement that talks about who you are, where you’re from, and some of your important contributions.
Answer:
My name is Andreas Vesalius and I'm a 16th-century Flemish anatomist, physician, and author of one of the most influential books on human anatomy, De Humani Corporis Fabrica Libri Septem. I am often referred to as the founder of modern human anatomy. I was born in Brussels, December 31, 1514 which was then part of the Habsburg Netherlands. I was a Flemish doctor who was notable for my contribution to the science of anatomy of the human body. I was the first to perform public dissection on a human corpse, a practice that was unusual in the Middle Ages due to spiritual beliefs.
Explanation:
How many grams of sugar (C12H22011) is needed to make a 1.3 L solution that is 0.13 M?
How many moles of SO3 are in 2.4 *10^23 cules?
Answer:
0.4 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{2.4 {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.3986...[/tex]
We have the final answer as
0.4 molesHope this helps you
____N2 + ____H2 ____NH3
Answer:
N2 + 3H2 + 2NH3
Explanation:
I'm assuming you're balancing the chemical equation
[tex]nitrogen \: reacts \: with \: hydrogen.[/tex]
N2 + 3H2 → 2NH3.
Explanation:-
L.H.S.
N = 2, H = 3×2 = 6.
R.H.S.
N = 2, H = 3×2 = 6.
The individuality of an organism is
determined by the organism's
A) amino acids
B) DNA nucleotide sequence
C) nitrogenous bases
D) transfer RNA molecules
atoms of which of elements will form covalent bonds in a compound
A. C and O
B. Na and F
C. Co and Fe
D. Li and Al
bacterial cells.
Which label belongs in the area marked animal?
nucleus
DNA
cell wall
ribosomes
Answer:
I believe it would be (nucleus)
If some salt were accidently spilled as it was transferred from the balance to the cup would your calculated enthalpy of solution of the salt be too high or too low
Answer:
It would be to low
Explanation:
If some salt were accidently spilled as it was transferred from balance to cup calculated enthalpy of solution of salt be too low as there will be loss in mass which would lead less solubility of salt and hence less enthalpy.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Nearly ¾ of the world's surface is covered with water so most of the earth's living things live in the
Answer:
ocean
Explanation:
aavssdbvsvasgvesvdbvsvdbvv
Answer:
oceans/lakes/ponds/rivers/creeks/seas
Explanation:
2C2H6 + 8O2 = 4CO2 + 6H2O
My teacher wants to know how many moles are required, how many moles oaf carbon dioxide are produced and how many moles of water are produced. Can somebody please help me?
Answer:
4 moles of carbon
6 moles of water
Explanation:
I think as there no data given u have to is the numbers infront of the equation e.g 4CO2 so 4.
hope this helps :)
What is the number of moles of glucose (C₆H₁₂O₆) in 0.500 L of a 0.40 M solution?
Answer:
0.20 moles
Explanation:
In order to solve this problem it is necessary to keep in mind the definition of molarity:
Molarity = moles / litersIf we input the data given by the problem we're left with:
0.40 M = moles / 0.500 LMeaning that we can proceed to calculate the number of moles:
moles = 0.40 M * 0.500 Lmoles = 0.20 molesThe number of moles of glucose ([tex]C_6H_{12}O_6[/tex]) in 0.500 Liters of a 0.40 M solution is 0.2 moles.
Given the following data:
Molarity of solution = 0.40 MVolume of solution = 0.500 LTo determine the number of moles of glucose ([tex]C_6H_{12}O_6[/tex]) in 0.500 Liters of a 0.40 M solution:
Mathematically, the molarity of a solution is given by the formula:
[tex]Molarity = \frac{number\;of\;moles}{Volume \;in\;liters}[/tex]
Making number of moles the subject of formula, we have:
[tex]Number\;of\;moles = Molarity \times Volume[/tex]
Substituting the given parameters into the formula, we have;
[tex]Number\;of\;moles = 0.40 \times 0.500[/tex]
Number of moles = 0.2 moles.
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What type of molecule is shown below?
H H
| |
H-C-C-0-H
|
Η Η
A. Ether
B. Aldehyde
C. Ketone
D. Alcohol
The type of molecule which is shown in the given question is alcohol, due to presence of hydroxyl group.
What are functional groups?Funcional groups are those specific groups which after attaching to any compound changes the property of that compound and then that compound will known by the propeties of that functional group.
Given molecule has the molecular structure CH₃-CH₂-OH, means in this molecule hydroxyl group is present which defines the general properties of alcohol.
Hence given molecule is an alcohol.
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What happens as liquid water boils?
A) The molecules are destroyed.
B) The mass of the molecules decreases.
C) The molecules become separated from each other.
D) The molecules break down into hydrogen and oxygen atoms.
Answer:
C) The molecules become separated from each other.
Explanation:
Which of these is not an organ in the
digestive system?
A. heart
B. stomach
C. intestine
Answer:
a
Explanation:
organs are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts.
an organism that a parasite lives in or on is a
A. prey
B. host
C. consumer
D. prey
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Which of the following are indicators of a healthy water source?
A.high nitrates, high pH, and low temperatures
B.low temperature, high dissolved oxygen, and neutral pH
C.low pH, high nitrates, and low dissolved oxygen
D.high turbidity, high dissolved oxygen, and high temperature
Answer:
B.
Explanation:
B. low temperature, high dissolved oxygen, and neutral pH
Hope this Helps.
Hydrogen gas reacts with oxygen gas to form water. At STP, how many liters of hydrogen gas react with 32.4 liter of oxygen gas? (H2 + O2 -> H2O)
Answer:
I think its 1.2L? i may be wrong
Explanation:
Recall old Avogadro's hypothesis...........
Equal volumes of gases contain AN EQUAL NUMBER of PARTICLES
And thus if there are
2.4
⋅
L
of dihydrogen, stoichiometric equivalence requires
1.2
⋅
L
of dioxygen. How many litres of water g
Awnser all of them if you can its really EASY im feelin generous today 30 pts
Answer: 1. Synthetic Substance or Synthetic compound 2. Oil 3. Biofuels 4. Salt and Sugar 5. medicine 6. Synthetic 7. Background Knowledge and Visualizing
Explanation: Hope this helps! Good luck!
Answer:
1= synthetic substance
2= natural gas
3= alcohol
4=artificial musks
5= medicine
6= synthetic
7=Questioning the Text
Explanation: If my answers are correct please mark me as a brainlist.
Look at the chemical equation.
HI (aq) + LiOH (aq) → LiI (aq) + H2O (l)
a) What is the total ionic equation?
b) What is the net ionic equation?
c) What is/are the spectator ion(s)?
d) What is the salt that is formed?
Answer:
See explanation
Explanation:
a) The total ionic equation shows all the ions involved in the equation as follows;
H^+(aq) + I^-(aq) + Li^+(aq) + OH^-(aq) ----> Li^+(aq) + I^-(aq) + H2O(l)
b) The net ionic equation only involves the ions that truly participated in the reaction.
H^+(aq) + OH^-(aq) ----> H2O(l)
c) The spectator ions appear on both sides of the reaction equation. They are; I^- and Li^+.
d) The salt formed is LiI (lithium iodide)
Why is Dalton's Gas Law a problem for people who visit high altitudes?
grade 8 chem/ science
Answer:
reactants
Explanation:
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how many ml of 10.0 m cacl2 do we need to prepare 3.00 l of a 0.500 m cacl2 solution
Answer:
150 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of stock solution (M₁) = 10 M
Volume of diluted solution (V₂) = 3 L
Molarity of diluted solution (M₂) = 0.5 M
Volume of stock solution needed (V₁) =?
The volume of stock solution needed can be obtained as follow:
M₁V₁ = M₂V₂
10 × V₁ = 0.5 × 3
10 × V₁ = 1.5
Divide both side by 10
V₁ = 1.5 / 10
V₁ = 0.15 L
Finally, we shall convert 0.15 L to mL. This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.15 L = 0.15 L × 1000 mL / 1 L
0.15 L = 150 mL
Therefore, the volume of the stock solution needed is 150 mL
The chemical name for MgCl3
Answer:
The chemical name is magnesium chloride
Answer:
Magnesium chloride
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