Answer:
The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely.
Explanation:
why is density a property of substances
HIiii. Hope y'all having a great day... so... i have a question...who's your favorite..rapper...singer....etc
u have 5 minutes GO!
Answer:
Louis Tomlinson, Emma Watson.
Explanation:
Thanks....you too ^_^
A teacher is demonstrating physical and chemical changes to her class. Which action should they use to demonstrate a chemical change?. Single choice.
(5 Points)
Cutting a piece of paper with scissors.
Ripping a piece of paper with their hands.
Burning a piece of paper with a match.
Folding a piece of paper into an airplane.
What mass of H2 is needed to react with 8.5 g of O2 according to the following equation G plus O2 (G)plus H2 ( G)?
0.547g h2
1.10g h2
4.38g h2
17.5 g h2
Based on the following electronegativity values, which of the following best explains the polarity of the bond formed?
Element
Electronegativity
Carbon 2.5
Fluorine 4.0
Lithium 1.0
Question 1 options:
Li-F is covalent because the electronegativity difference is 5.0
C-F is ionic because the electronegativity difference is 1.5
Li-F is ionic because the electronegativity difference is 3.0
C-F is covalent because the electronegativity difference is 6.5
Answer:
see the pic for the answer
How does the maximum water level for spring tides compare with the maximum water level for neap tides?
Answer:
Spring tides have higher high tides and lower low tides whereas neap tides have lower high tides and higher low tides. Hence, the range is much larger in a spring tide than in a low tide.
Explanation:
(difference in water level between high and low tide)
Mass = 120 g
Length = 3 cm
Width = 2 cm
Height = 1 cm
What is the density of the rectangular prism?
10 g/cm3
20 g/cm3
360 g/cm3
720 g/cm3
Question 15 (1 point)
Iron (II) Bromide contains one iron atom and two Bromine atoms. Replacing the anion
with oxygen would require more or less oxygen atoms? Why?
Answer:
Atoms are electrically neutral because the number of protons, which carry a 1+ charge, in the nucleus of an atom is equal to the number of electrons, which carry a 1- charge, in the atom. The result is that the total positive charge of the protons cancels out the total negative charge of the electrons so that the net charge of the atom is zero. Most atoms, however, can either gain or lose electrons; when they do so, the number of electrons becomes different from the number of protons in the nucleus. The resulting charged species is called an ion.
Cations and anions
When a neutral atom loses one or more electrons, the total number of electrons decreases while the number of protons in the nucleus remains the same. The result is that the atom becomes a cation—an ion with a net positive charge.
The opposite process can also occur. When a neutral atom gains one or more electrons, the number of electrons increases while the number of protons in the nucleus remains the same. The result is that the atom becomes an anion—an ion with a net negative charge. We can illustrate this by examining some very simple cations and anions, those formed when a single hydrogen atom loses or gains an electron.
Note: Hydrogen is actually somewhat unusual in that it readily forms both cations and anions. Most elements much prefer to form only one or the other. In terms of its electron configuration, can you explain why hydrogen can form both cations and anions? Feel free to post in the comments at the end of the article!
A hydrogen cation, a hydrogen atom, and a hydrogen anion.
A hydrogen cation, a hydrogen atom, and a hydrogen anion.
Classification cation neutral atom anion
No. of protons 111 111 111
No. of electrons 000 111 222
Net charge 111++plus 000 111-−minus
If a neutral hydrogen atom ( \text{H}Hstart text, H, end text, center) loses an electron, it becomes a hydrogen cation ( \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript, left). Conversely, if the neutral \text{H}Hstart text, H, end text atom gains an electron, it becomes a hydrogen anion ( \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript, right), also known as a hydride ion. Image credit: adapted from Boundless Learning, CC BY-SA 4.0.
In the center column, we have a diagram of a single, neutral hydrogen atom. It contains one proton and one electron; thus, its net charge is zero. If hydrogen loses its electron, it forms the cation \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript (left column). The \text{H}^+H
+
start text, H, end text, start superscript, plus, end superscript cation has a net charge of 1+ from the one proton in the nucleus since there are no electrons to cancel out the positive charge. If neutral hydrogen gains an electron, it forms the anion \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript (right column). The \text{H}^-H
−
start text, H, end text, start superscript, minus, end superscript anion has a net charge of 1- because it has one extra electron compared to the total number of protons.
Explanation: Hopes this gives a better explanation on them!
Who used scientific investigations to study atoms? Check all that apply.
Answer:
In the early 1900s, Ernest Rutherford studied (among other things) the organization of the atom — the fundamental particle of the natural world. Though atoms cannot be seen with the naked eye, they can be studied with the tools of science since they are part of the natural world.
Write 2.0 x 10^-3 in standard notation.
Answer:
20^-4
Explanation:
At what temperature does gas stay
Answer:
i would say
112 degrees Fahrenheit
or
100 degrees celsius
Explanation:
brainliest pls if correct
fill the 2 letter bellow
h_gs and k_sses
What type of bonds are shown below?1091AQ1
A. Ionic
B. Polar covalent
C. Nonpolar covalent
D. There is not enough information to determine the answer.
I'm 99% sure it is A Ionic
Answer: It’s B, Polar covalent
Explanation:
promise I will mark u brainiest help me
Answer:
Your answer is C
Explanation:
It takes a lot of energy to overcome the strong electrostatic forces of attraction between oppositely charged ions, so ionic compounds have high melting and boiling points. ... Magnesium oxide is made from ions with two charges (Mg 2+ and O 2-) and so has a much higher melting point of 2852°C.
Answer:
it is an ionic compound
Explanation:
made from ions of two charges Mg 2+ and O 2- thus has a melting point of 2852 degree celsius
As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the
As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the effective nuclear charge and increase in the ionization enthalpy.
What is effective nuclear charge?Effective nuclear charge of an atom is the attraction force of positive charge of protons present inside the nucleus acts as an valence electrons.
The effective nuclear charge is alway slower than the total number of protons of the nucleus because of shielding effect. Where Z is the atomic number and S is the number of shielding electrons.
Therefore, the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the effective nuclear charge and increase in the ionization enthalpy.
Learn more about effective nuclear charge, here:
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C2H6BrCl is a compound. What is the ratio of carbon to bromine atoms in the molecules!
1:1
1:3
1:6
3:1
3:6
6:1
3:6:1
Answer:
3 1
Explanation:
what is the name of this iconic compund:
NaBr
Answer:
Sodium Bromide
Explanation:
Answer:
Sodium Bromide
Explanation:
Na is sodium, Br is bromine. Together they form the compound Sodium Bromide
When 3 fatty acids combine with one glycerol they form a
Answer: They form a Triacylglycerol
What are minerals the building blocks of?
Answer:?
Explanation:
Answer:
Minerals are the building blocks of rocks. Nature cements combinations of minerals together to form rocks.
Explanation:
Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1."
Choose...
C 3 H 8 +
Choose...
O 2 →
Choose...
CO 2 +
Choose...
h2o
Answer:
4
C 3 H 8 +
13
O 2 →
8
CO 2 +
10
H 2 O
hope this helps :)
A box has a length of 4 cm, a width of 10 cm, and a height of 2 cm. The volume of the box is:
18 cm
18 cm3
80 cm
80 cm3
Which equation is most likely used to determine the acceleration from velocity vs. time graph?
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Acceleration.
a = V2-V1/t
so the correct answer is, a = ∆v/t
option C.) is correct, a = ∆v/t
Answer:
m = y2-y1 / x2-x1
Explanation:
What does the big ‘2’ in 2NH3 mean?
Answer:
hiiii ;) how ru to day
Explanation:
PLS HELP,THANKS:)
Which ball has the most potential energy?
A. A
В. В
C. C
D. D
SUBMIT
Answer:
A. A ball has most potential energy.
Describe the observation Robert Brown made.
Answer:
In 1827, Brown observed, using a microscope, that small particles ejected from pollen grains suspended in water executed a kind of continuous and jittery movement, this was named “Brownian motion”. ... This random movement of particles suspended in a fluid is now called after him.
Explanation:
HOPE this helps :)
Answer:
In 1827, Brown observed, using a microscope, that small particles ejected from pollen grains suspended in water executed a kind of continuous and jittery movement, this was named “Brownian motion.This random movement of particles suspended in a fluid is now called after him.
Which statement about quantum numbers is NOT
correct?
a
Two or more electrons in an atom can
have the same set of quantum numbers.
b
Quantum numbers describe the orbitals
of an atom.
с
Quantum numbers describe the location
of each electron in an atom.
d
Quantum numbers describe the energy
of each electron in an atom.
The statement that is not correct here is two or more electrons in an atom can have the same set of quantum numbers. The correct option is a.
What are quantum numbers?To describe the location of an electron in an associated atom, we use a series of specific numbers known as quantum numbers.
Quantum numbers describe the properties of atomic orbitals and the electrons within them. The state of an electron in an atom or ion is described by four quantum numbers.
The primary quantum number, denoted by n, represents the electron's primary energy level. Energy levels are fixed distances from an atom's nucleus.
According to the Pauli Exclusion Principle, no two electrons in an atom or molecule can have the same four electronic quantum numbers.
Because an orbital can only hold a maximum of two electrons, the electrons must have opposing spins.
Thus, the correct option is A.
For more details regarding quantum numbers, visit:
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Why do some parents like to add water to their kids' juice? Why dilute it?
Portland cement (J. Aspdin) contains maximum % of CaO. Cement clinker contains
A) limestone & clay as raw materials
B) SiO2 to Al2O3 ratio 2.5 to 4.0 or [tex]\frac{CaO}{SiO2 + Al2O3+ Fe2O3}[/tex]
C) gypsum, fly ash and black ash (Na2CO3 + CaS)
D) [tex]Ca_{2}SiO_{4}-26%, Ca_{3}SiO_{5} -51%, Ca_{3}Al_{2}O_{6}-11% [/tex]
Answer:
The correct option is D
Explanation:
The major raw material used in making cement clinker is limestone. This limestone is usually mixed and heated with clay and can sometimes be mixed, in addition to the clay, with fly ash, black ash, bauxite, iron ore and gypsum. However, the product cement clinker contains different calcium silicates and/or aluminates such as Ca₃SiO₅, Ca₃Al₂O₆, Ca₂(Al,Fe)₂O₅ and Ca₂SiO₄. Thus, the correct option is D.
is liquid ice-cream batter a solid, liquid, or gas?
Answer:
Liquid
Explanation:
What type of microscope would be best for studying the structures found inside of cells?
a
confocal microscope
b
stereoscope
c
electron microscope
d
compound microscope