Answer:
Hydrogen lithium and sodium
predict the reactants or products in the following nuclear reactions:
Answer:
I will try to solve these problems
What is one of the oldest tricks in the chemist toolbox? Why did this become less and less useful?
10. What two pieces of information does a chemical formula give?
The chemical formula gives the ratio of atoms and elements in the compound. Therefore, option B, D is correct.
What is the chemical formula?A chemical formula of a compound provides the chemical proportions of each element in a given compound or molecule. The chemical formula of a compound can be written with help of chemical symbols of elements, numbers, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.
A chemical formula exhibits of no words related to the compound but can be drawn in some simple chemical structures. Chemical formulae of the compound should be limited in power than chemical names as well as chemical structural formulae.
There are two kinds of chemical formulas in chemistry: empirical formula and molecular formula.
The chemical formula gives in the formation of the different types of elements in the compound and the ratio of their atoms.
Learn more about chemical formula, here:
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Consider the reactions C2H4(g) + 2O2(g) → 2CO(g) + 2H2O(g) ∆H = −758 kJ mol−1 2C(s) + 2H2(g) → C2H4(g) ∆H = +52 kJ mol−1 H2(g) + O2(g) → H2O(g) ∆H = −242 kJ mol−1 The enthalpy of formation of carbon monoxide is A −111 kJ mol−1 B −163 kJ mol−1 C −222 kJ mol−1 D -464 kJ mol−1
C2H4(g) + 2O2(g) → 2CO(g) + 2H2O(g) ∆H1 = −758 kJ mol−1 ....1)
2C(s) + 2H2(g) → C2H4(g) ∆H2 = +52 kJ mol−1 ....2)
H2(g) + O2(g) → H2O(g) ∆H3 = −242 kJ mol−1 ....3)
Now, enthalpy of formation of carbon monoxide is given by :
∆H = ∆H1 + ∆H2 - ∆H3
∆H = ( -758 + 52 - ( -242 ) ) kJ mol−1
∆H = −464 kJ mol−1
Therefore, the enthalpy of formation of carbon monoxide is -464 kJ mol−1.
Hence, this is the required solution.
Describe air using the terms: mixture, atoms, and molecules.
Answer:
Air, is a mixture of atoms and molecules, while the space between said atoms, and molecules can expand and contract depending on the temperature.
Mia put one liter of a substance into a 5 liter container. After 5 minutes she checked and the substances had expanded to take up the entire container. What substance did she use?
Group of answer choices
liquid
ice cubes
solid
gas
Answer:
Solid
Explanation:
Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. ... It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained.
Advertisers use the
because companies hope that repeated exposure to their product will make people feel familiar with it and more likely to buy it.
Advertisers use the familiarity effect because companies hope that repeated exposure to their product will make people feel familiar with it and more likely to buy it.
What is familiarity effect ?Psychologists have even discovered that the more you see someone, the more likely you are to develop attraction for them. Even if the stimuli you are repeatedly exposed to is negative, you will find comfort in its familiarity.
We are drawn to people who appear familiar to us because familiarity provides predictability and safety." Imprinting is one such theory that is linked with familiarity.
Thus, Advertisers use the familiarity effect because companies hope that repeated exposure to their product will make people feel familiar with it and more likely to buy it.
To learn more about the familiarity effect, follow the link;
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A quarterback back pedals 3.3 meters southward and then runs 5.7 meters northward
Answer:
if you run backward 3.3 meters then run 5.7 meters the opposite ways then you would have run 2.4 meters then where you started off. I hope this helped.
Explanation:
Bored pls talk to me.
my Roblox account name jxal1...........
Explanation:
Jesus Christ had dreads so shake em', I ain't got none but I'm planning on growing some
Answer:
ooo_SoSpooky add me :>
Superstition or science
Singing while cooking is prohibited because you will end up marrying a widower.
Explanation
Science not chemistry.
Answer:
superstition
Explanation:
Because its not related to science ,and also telling about future.
what is the house off Neutron
Answer: Jimmy Neutron 's House is host to Jimmy Neutron, Judy Neutron, Hugh Neutron, and Goddard. It is located on one side of the street from Cindy Vortex 's Building, both of which are located in Retroville, Texas, the United States of America, Alaska and Hawaii, North America and Planet Earth. Inhabitant: Jimmy Neutron.
Explanation:
Where do i find the grad? What is the Grad???
advantage fossil fuel
Answer:
The advantages of fossil fuels are that they are abundant and accessible, they provide a large amount of concentrated energy, they are relatively low cost and they can be transported relatively easily.
Hope this helped, if not, don’t hate.
PLEASE HELP ! (PICTURE)❗️
Answer:
si
Explanation:
Which of these best defines climate?
a
Atmospheric condition at one place and time
b
Day-to-day condition of the atmosphere
c
Long-term condition of the atmosphere
d
Current atmospheric condition
Answer:
c
Explanation:
they usually say "climate change" like it's a big deal so it should be long term
A. Atmospheric condition at one place and time.
Explanation:I think the letter A is the one that best defines "climate"
hope this help!
Sorry if Im wrong
ch question carries 2 mark. Time Remaining : 00 : 46 : 33 Some oxides are given below. (i)Na2O (ii)NO2 (iii) CO2 (iv) MgO a) Which are the basic oxides among these? b) What is the name of the aqueous solution of CO2 ?
The basic oxide is an oxide-forming a base solution.
These oxides are mainly from group 1 alkaline and group 2-alkaline earth
If this oxide is dissolved in water it will form an alkaline solution
LO + H₂O --> L(OH)₂ ---> alkaline earth
L₂O + H₂O --> LOH --> alkaline
So the basic oxides : Na₂O and MgO
Na₂O + H₂O --> NaOH (sodium hydroxide, strong base)
MgO + H₂O --> Mg(OH)₂ (magnesium hydroxide, strong base)
The aqueous solution of CO₂ , obtained by dissolving CO₂ in water
CO₂ + H₂O --> H₂CO₃ (carbonic acid)
In general, basic oxide is obtained from metal oxide, while acid oxide is obtained from non-metal oxide
Is Orange Juice with Pulp is Heterogeneous
or Homogeneous Mixture?
Answer:
I think so henterogeneous
In science, a summary of observed behavior is referred to as a(n)
Answer:
Law
Explanation:
A law is a summary of observed (measurable) behavior, whereas a theory is an explanation of behavior. A law tells what happens; a theory (model) is our attempt to explain why it happens.
convert 1234584 dimes to dollars
HUGE POINT GIVEAWAY EASY QUESTION + BRAINLIEST :))))))))
(((PICTURE BELOW)))
Answer:
Electrolytes
Explanation:
I answered this before kk
Answer:
ions lol
Explanation:
What indicates a chemical change?
O A. A change in the shape of a substance
O B. A change in volume
O C. A change from a liquid to a gas
O D. A change from one substance to another
Answer:
O D.A change from one substance to aonther
Explanation:
the formeashon on iron is a chemical change
Help me please!!!!!!!!?????
Answer:
i believe its A or D
Explanation:
sorry is its wrong
hope it helps
Except for the bolt, note the difference between the calculated volumes and the volume found by the displacement method. Which method is more accurate? Why?
Answer:
See explanation
Explanation:
The most accurate method of determining the volume of an object, is the water displacement method. It has the peculiar advantage of working well with irregular solids.
There are often errors that prevent exact measurements of the volume of objects. This makes the water displacement method a preferred and easier method of determining the volume of an object.
An orbital that could never exist according to the quantum description of the atom is
Answer:
d. 3f
Explanation:
An orbital in chemistry is defined as the wave function that defines the position of electrons in an atom.
There are four types of orbitals that include s, p, d, and f. On the basis of the quantum description, 3f orbital does not exist because in the third energy level only three sublevels are present that are s, p, and d that can hold a maximum of 18 electrons.
Hence, the correct answer is "d.3f".
For the 3 principal orbitals, f suborbital has not been possible. Thus the orbital that could never exist according to the quantum description of the atom is 3f. Thus the correct option is d.
Quantum mechanics helps in the determination of the electron address. The electron address has been given by the 4 quantum numbers namely,
Principal quantum numberAzimuthal quantum numberMagnetic quantum numberSpin quantum numberThe principal quantum number gives the information to the orbital, and the azimuthal quantum number gives the information of the subshell.
The orbitals have been formed by the mixing of the bonding and anti-bonding orbital. The mixing of the 3 orbital has resulted in the 3 suborbital namely s, p, and d.
Thus for the 3 principal orbitals, f suborbital has not been possible. Thus the orbital that could never exist according to the quantum description of the atom is 3f. Thus the correct option is d.
For more information about the quantum description of atom, refer to the link:
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Malia is interested in observing cognitive development in children and wants to design a study that will allow her to observe small changes in how 6-year-olds learn to solve problems. She plans to collect data from each child every week for three months.
Which design is her best choice?
A] microgenetic
B] cross-sequential
C] cross-sectional
D] longitudinal
Answer: Microgenetic
Explanation: I just took the test :3
Calculate the energy of a photon of light with a frequency of 6.17 x 1014 Hz.
Answer:
The answer is
[tex] \huge 4.088 \times {10}^{ - 19} \:J[/tex]
Explanation:
The energy of a photon of light can be found by using the formula
E = hfwhere
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
f = 6.17 × 10¹⁴ Hz
We have
E = 6.17 × 10¹⁴ × 6.626 × 10-³⁴
We have the final answer as
[tex]4.088 \times {10}^{ - 19} \: \: J[/tex]
Hope this helps you
In the early 1900s, Ernest Rutherford set up an experiment to study the atom. He bombarded thin metal sheets with protons and neutrons. He found that most of particles got deflected a bit, but some of them bounced back as if bouncing off a brick wall. What conclusion came from this experiment?
Answer:
Atoms are mostly empty space.
Why does a sound moving away from you have a bwerport?
a. the wavelength is decreasing
c the wavelength is increasing
b. The object is moving too fast
d. the object is moving too slow
I
Why can’t you store a fixed amount of gas in an open container like a glass?
Answer:
Gasoline is very volatile and if not kept in a tightly sealed container will quickly fill a space with vapors at a sufficient concentration to be a fire and explosion hazard. Don't even THINK about keeping gasoline in an open container. Well, you can if it is a dense and heavier-than-air gas.
Explanation:
What is the primary reason why elements form compounds?
Answer:
To gain stability
Explanation:
If the outermost shell is not completely filled with electrons, the element has one of the three options: gaining electrons, losing electrons or sharing electrons. By gaining or losing electrons, ionic compounds are produced. Sharing of electrons results in the formation of covalent compounds.