Answer:
The periodic table is useful today for finding out all the elements that exists on Earth. The elements there can be used to write down chemical formulas, calculate things like molar mass/atomic mass of each element, atomic number for each, number of valence electrons each element has, the oxidation number for each, etc. Lastly, it can be used to predict the properties of elements yet to be discovered.
Explanation:
Hope it helped!
I am a little confused
Who has heard of TD Jakes?
Which of the following describes and an atom that is neutral?
A) 15 protons, 14 neutrons, and 14 electrons
B) 15 protons, 14 neutrons, and 15 electrons
C) 15 protons, 15 neutrons, and 14 electrons
D) 15 protons, 14 neutrons, and 16 electrons
Answer:
The answer is B
Explanation:
Protons and electrons have to be equal numbers for it to be neutral
Answer:b
Explanation:
Please help me if you good at science I’m over here struggling I’ll mark brainliest :)
Answer:
C.
Explanation:
Question: How many grains of rice are in a 453.6 g (1lb.) bag of rice?
The rice is white.
The height of the bag of rice is 2.54 cm.
The length of the bag of rice is 20 cm.
The width of the bag of rice is 8 cm.
A grain of rice has a length of 6.0 mm.
20 grains of rice weigh .58 grams.
Answer:
453.6/58/2=453.6/2.9=156.314 grains
The number of grains in a 453.6 g (1lb.) bag of rice is equal to 157 grains of rice.
What is weight?The weight can be described as the force acting due to gravity. Weight can be considered as a vector quantity if the gravitational pull is acting on the body.
Therefore, in free fall, the weight of the object would be zero. Therefore, terrestrial objects can be weightless while ignoring air resistance.
The unit for measurement of weight is the same as of force, which is the newton. A body with a mass of 1 kilogram will exhibit a weight of about 9.8 Newton on the surface of the Earth, and about 1/6th as much weight on the Moon.
Given the weight of the 20 grains = 58 g
The weight of one grain = 58/20 = 2.9 g
The number of grains (n) of rice in weight 453.6 g of the bag of rice can be calculated as:
n = 453.6/2.9
n = 156.4 ≈ 157
Therefore, the number of grains can be considered equal to 157 grains of rice.
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Is corona increasing or decreasing the albedo effect? Explain.
Answer:
corona is increasing
.......
Explanation:
.....
What do we call a cloud that forms right on the surface of the Earth? *
Answer:
that's ur answer cumulus clouds I hope it helps
Which two molecules come out of the chloroplast in photosynthesis?
Answer:
(H2O) and (O2) ??
Explanation:
I hope it helps...
jowl is a derived unit give reason
Answer:
Explanation:
Joule is the unit of energy and work done.
It is a derived quantity because it is not a fundamental or basic unit.
A derived unit is formed by the combination of two or more fundamental quantities.
Since work done = Force x distance
Force = mass x acceleration
= mass x acceleration x distance
The unit then becomes kgm²/s²
So, 1joule = 1kgm²/s²
Write the atomic number of the element with the following electronic configuration
1s2 2s2 2p6 3s2 3p6 3d7 4s2
Answer:
Atomic Number: 27 (Co, Cobalt)
Explanation:
4s2 is before 3d7*
Titanium consists of two isotopes of masses 46.90 amu and 48.95 amu. If the first isotope has a percent abundance of 70.84%, what is the percent abundance of the second isotope?
Answer: 29.16%
Explanation:
The total of 2 percentages need to equal 100% so we subtract the percent they gave us from 100.
where would you expect light waves to move fastest
A:in space
B:under the sea
c:on a mountain top
D:through a iceberg
Answer: iceberg
Explanation: im pretty sure
Answer:
In space (Trust me)
during a 2 hour trip,a family is able to travel 140 kilometers. what is the average speed of the family during this portion of this trip?
The average speed of the family : 70 km/h
Further explanationGiven
time = 2 hour
distance = 140 km
Required
The average speed
Solution
Distance is the length traveled by an object within a certain time
Average speed = total distance/total amount of time
Can be formulated :
Avg speed = d : t
Total distance traveled : 140 km
Total time : 2 hr
Avg speed = 140 : 2 = 70 km/h
How can you determine the number of neutrons in an atom?
A. Atomic number minus mass number
B. Mass number minus atomic number
C. Atomic number plus mass number
D. Mass number plus number of electrons
the first one to answer gets the brainliest UwU
Answer:
d
Explanation:
Answer: B. Mass number minus atomic number
Explanation: The atomic # is equal to the # of protons. The mass number is the total mass of neutrons & protons. You subtract the protons (atomic number) from the mass of the atom, the formula would be as shown:
Mass - Protons = Neutrons
An example is shown below
Element: Tin
Name shown on periodic table: Sn
Atomic #: 50
Mass # 118.711
118.711 - 50 = 68.711 <--- answer
Mass^ ^Protons/ Atomic #
I hope this helps :)
Balance this equation and pick the answer with the coefficients that belong there.
A coefficient of 1 is understood but make the answers clear I will include the number 1.
Group of answer choices
2,3,6,1
2,3,6,1
3,1,2,1
3,2,1,6
4,6,6,2
Answer:
2,3,6,1
2,3,6,1
Explanation:
The unbalanced reaction expression is given as:
AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃
We need to balanced this reaction equation. Our approach is a mathematical method where we assign variable a,b,c and d as the coefficients.
aAlBr₃ + bK₂SO₄ → cKBr + dAl₂(SO₄)₃
Conserving Al; a = 2d
Br: 3a = c
K: 2b = c
S: b = 3d
O: 4b = 12d
Let a = 1, c = 3, d = [tex]\frac{1}{2}[/tex] b = [tex]\frac{3}{2}[/tex]
Multiply through by 2 to give;
a = 2, b = 3, c = 6 and d = 1
2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃
How many moles of H2O would be equal to 5.69 x 1022 molecules of H2O?
Answer: 9.656332386078939e-21
Explanation:
The SI base unit for amount of substance is the mole. 1 grams H2O is equal to 0.055508435061792 mole. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between grams H2O and mole. Type in your own numbers in the form to convert the units
Calculate the number of moles in 5.37 x 10 19 atoms of Iron.
*
Answer:
Answer below:)
Explanation:
5.37 * 10^19 atoms of Iron (mol/6.022 *10^23)= 8.92 *10^-5
Ideally speaking, bonds tend to form between two particles such that they are separated by a distance where _______ net force is exerted on them, and their overall energy is _________.
The question is incomplete, the complete question is;
Ideally speaking, bonds tend to form between two particles such that they are separated by a distance where _______ net force is exerted on them, and their overall energy is _________.
A.zero, maximized
B. a negative, minimized
C. a positive, minimized
D. a positive, maximized
E. zero, minimized
F. a negative, maximized
Answer:
E. zero, minimized
Explanation:
Chemical bonding occurs when there is a dynamic equilibrium between the attractive and repulsive forces. This means that the magnitudes of the attractive and repulsive forces are equal and the net force is zero.
Also, at the point where bonding occurs, the energy of the system is minimum. The point on the potential energy curve that represents the bonding energy is the lowest point on the curve.
Ideally speaking, bonds tend to form between two particles such that they
are separated by a distance where zero net force is exerted on them, and
their overall energy is minimized.
For chemical bonding to occur there must be dynamic equilibrium. This is
formed from magnitude of the attractive and repulsive forces being equal
which translates to the net force being zero.
The overall energy at the exact point of bonding is at the minimum which is
to allow easy transfer or sharing of electrons in the formation of a compound.
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2C,H.19)
70, (9) + 400, (9) + 6H,00).
Answer:
g) 400 (h) 1331 (i) 11 (j) 20 (k) 13 (l) 15 ... (e) 1 , 2, 3, 6, 9, 18 (f) 1, 5, 25 (g) 1, 2, 4, 5, 8, 10, 20, 40. (h) 1, 2 ... 19. 70 x. (h) x. 6. (i). 9. 8 x. (j). 27. 24 x. (k). 5. 4. 20 a b. +. (l). 8. 3. 24 x y. +. (m).
What is the function of each of these structures?
which is the best definition of a molecule
Answer:
Explanation:
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and molecule is often used when referring to polyatomic ions
Chris tested several metallic objects to see if they were magnetic. He concluded that many metallic objects were not magnetic. Which observation would have led Chris to this conclusion?
Answer:
the metallic objects not sticking to a magnet
Use the following information to answer Q1-Q3
The shuttle has a separate fuel tank containing liquid hydrogen and liquid
oxygen.
Explain why hydrogen and oxygen are transported as liquids rather than as gases.
Answer:
Likely the reason behind carrying them in liquid for is to condense them. liquid takes up far less space than gases do and will last far longer. they can be transformed back into gases through heating them back up. To keep them solid would require frigid temperatures but liquid will transfer more easily through space.
P4 + 302 → 2P203
what type of chemical equation is this?
Answer:
This is an oxidation-reduction (redox) reaction
Explanation:
P4
O2
Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04
Products:
P2O3
Names: Phosphorus trioxide source: wikipedia, accessed: 2019-09-27, Phosphorus(III) oxide source: wikipedia, accessed: 2019-09-27, Phosphorus sesquioxide source: wikipedia, accessed: 2019-09-27
Appearance: Colourless monoclinic crystals or liquid source: wikipedia, accessed: 2019-09-27
5. If you combine 15.6 g Mg with 13.9 g of Br, what is the percent composition of each
element in the mixture.
Answer:
Mg: 52.9%
Br: 47.1%
Explanation:
Which particle would settle quickly?
a low-density sediment
an irregularly shaped sediment
a large sediment
a small sediment
What causes Bread to be fluffy? What kind is bread of the fluffiest?
1) Click the orange button to "Break Bonds." What is needed in order to break a
chemical bond?
Which problem can NOT be answered by experiment?
A) Do ultraviolet rays cause skin cancer
B) Does a certain drug kill the AIDS virus
C) Which wavelength of light has the most energy
D) Did continental drift cause the extinction or the megalodon?
Answer:
the answer is C
Explanation:
Explanation is C
Answer: the answer above is wrong, the correct answer is: Did continental drift cause the extinction of the megalodon
Explanation:
what metals will react with hydrochloride acid to yield hydrogen gas