Explanation:
The air around the equator has a high temperature, so it has a _lower_____ air pressure
PbS+FeN → Fe2S3 + Pb3N2
Can someone please valence this for meeeee
Answer:
html
Explanation:
im in web tech
The nucleus of an atom is made up of a dense ball
of_________and_____________surrounded by________.
Answer:
The nucleus of an atom is made up of a dense ball
of protons and neutrons surrounded by electrons.
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
In which layer of Earth's atmosphere does outer space begin..?
A. ) Stratosphere
B. ) Mesosphere
C. ) Thermosphere
D. ) Troposphere
Please post a real answer.
Answer:
Option C
Explanation:
Because of how low the air density is, most consider it as entering outer space when you enter into the "Thermosphere" or option C. The Thermosphere is approximately 800 kilometres in the sky right above the Mesosphere and the Stratosphere which most fighter jets maximum height is.
Hope this helps.
Which two large landmasses formed when Pangaea first started to separate?
Answer:
Laurasia and Gondwanaland
Explanation:
Answer:
D
Explanation:
Why is it important to understand the properties of matter?
:It's important for scientists to know the properties of matter because all things are made up of matter. Each type of matter has different physical characteristics and scientists need to know and understand these characteristics to make calculations.
Explanation:
Answer:
its not
Explanation:
bc its dumb.. thx for the points
355 g of chlorine gas (MW = 70.9 g/mol) isheld in a vessel with a fixed volume of 70.0 L. What is the pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius?
Answer:
1.78 atm
Explanation:
From the question given above, the following data were obtained:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Volume (V) = 70.0 L
Temperature (T) = 30 °C
Pressure (P) =?
Next, we shall determine the number of mole in 355 g of chlorine (Cl). This can be obtained as follow:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Mole of Cl =.?
Mole = mass /molecular weight
Mole of Cl = 355 /70.9
Mole of Cl = 5 moles
Next, we shall convert 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Temperature (T) = 30 °C
Temperature (T) = 30 °C + 273 = 303 K
Finally, we shall determine the pressure of the gas as illustrated below:
Volume (V) = 70.0 L
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
PV = nRT
P × 70 = 5 × 0.0821 × 303
P × 70 = 124.3815
Divide both side by 70
P = 124.3815 / 70
P = 1.78 atm
Therefore, the pressure of the gas is 1.78 atm
The pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius is 1.77 atm.
How do we calculate pressure?Pressure of the given gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of chlorine gas = ?
V = volume of chlorine gas = 70 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature chlorine = 30 degree celsius = 303 K
n is the moles of gas which can be calculated as:
n = W/M, where
W = given mass of chlorine gas = 355g
M = molar mass of chlorine gas = 70.9g/mol
n = 355/70.9 = 5 moles
On putting all these values on the above equation and calculate for P, we get
P = (5)(0.082)(303) / 70
P = 1.77 atm
Hence required pressure is 1.77 atm.
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The presence of which ion usually produces a colored solution? A. K+
B. F-
C. Fe2+
D. S2-
The presence of which Fe²⁺ ion usually produces a colored solution. Therefore, option C is correct.
What is an ion?An ion can be described as a chemical specie that exhibited a positive or negative charge. The term ‘ion’ can be referred to atoms or molecules with non-zero charges on them. Therefore, all atoms have more electrons than protons or more protons than electrons.
If the number of protons in atomic structure is greater than electrons are termed to hold a net positive charge and are referred to as cations. The ions that contain a greater number of electrons than protons in atomic structure hold a net negative charge are anions.
The electronic configuration of the iron is [Ar]3d⁶4s². As the iron atom losses 2 electrons in its valence shell, it becomes a cation Fe²⁺ ion. As it has four unpaired electrons produces a colored solution.
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As Mia mixed two substances in a test tube, she noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, what was most likely occurring inside the test tube?
The two substances underwent a physical change
The two substances were melting
A new substance was forming
A change in the mass of the two substances
Next
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9:15 AM
11/18/2020
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Answer:
A new substance was forming
Explanation:
Two types of changes are undergone by substances involved in a reaction. They are physical changes and chemical changes. Physical changes are those changes that does not involve the synthesis of a new product. On the other hand, CHEMICAL CHANGES alters the chemical composition of the substances involved, and hence, new substances are formed.
Chemical changes are usually characterized by change of temperature, color change, evolution of a gas etc. According to this question, Mia mixed two substances in a test tube and noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCE, HAS OCCURRED.
Below are models of two types of cells. Which of the following structures 2 points
are common to both cell types?
A. mitochondria and vacuoles
B. mitochondria and cell wall
C. vacuoles and chloroplasts
D. cell wall and chloroplasts
Answer:
D is the right answer cell wall and chloroplasts
Answer:D
Explanation: Because you know what each cell looks like
In support of the Thirteenth Amendment, President Lincoln argued that
slavery did not impact the Civil War.
slavery should be made illegal everywhere.
slavery should be allowed in the South only.
slavery should be allowed in the North only.
Answer:
should be made illeagl everywhere
Explanation:
i took the test
Abraham Lincoln believed that American democracy meant equal rights and equality of opportunity. According to him, slavery is wrong both morally and politically. He said that slavery should be made illegal everywhere. The correct option is B.
What is Thirteenth Amendment?The 13th Amendment to the U.S constitution ratified in 1865 in the aftermath of the civil war, abolished slavery in the united states. The 13th Amendment states that ''Neither slavery nor involuntary servitude, except as a punishment for crime shall exist within the united states.
The term slavery indicates the ownership of a person as property, especially in regards to their labor. A slave is a person who is owned by another person or is forced to work against their own will.
Lincoln's position on slavery in the united states is one of the most discussed aspects of his life. Lincoln frequently expressed his moral opposition to slavery in public and private.
Thus the correct option is B.
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99 POINTS!! Question: Tell what information each number or symbol in a chemical formula tells you. (Please be specific :)
1. subscript
2. coefficient
3. parentheses
4. element symbol
5. no number written
Answer: A subscript or superscript is a character that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, while superscripts are above.
a coefficient is a constant term related to the properties of a product. In the equation that measures friction, for example, the number that always stays the same is the coefficient.
Parentheses are used in mathematical expressions to denote modifications to normal order of operations (precedence rules). In an expression like , the part of the expression within the parentheses, , is evaluated first, and then this result is used in the rest of the expression.
Chemical symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalized.
That there are no numbers present in the chemical formula means that there is one atom of each element present in the molecule. The Periodic Table reveals that Na is the symbol for sodium, and Cl is the symbol for chlorine.
Explanation:
Is this Good enough?
Answer:
1. A subscript or superscript is a character that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text. Subscripts appear at or below the baseline, while superscripts are above.
2. In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters and must be clearly distinguished from the other variables.
3. In rhetoric, a parenthesis or parenthetical phrase is an explanatory or qualifying word, clause, or sentence inserted into a passage. The parenthesis could be left out and still form grammatically correct text. Parentheses are usually marked off by round or square brackets, dashes, or commas.
4. Chemical symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised
5. The numero sign or numero symbol, №, is a typographic abbreviation of the word number indicating ordinal numeration, especially in names and titles. For example, using the numero sign, the written long-form of the address "Number 22 Acacia Avenue" is shortened to "№ 22 Acacia Avenue", yet both forms are spoken long
Explanation:
BTW i copied and pasted from the internet, i did not have time to write it all down cause im on an edge quiz, sorry.
What group on the Periodic Table contains the elements of the alkaline
earth family?
Answer:
The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Explanation:
hope that helps
Please tell me what the answer is please
Answer:
2
Explanation:
Answer:
The brain
Explanation:
Convert 9.3 moles of KBr to grams.
Answer:
119.0023 grams
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KBr, or 119.0023 grams.
The mass of one mole of KBr is 118 grams. Hence, the mass of 9.3 moles of KBr is 1097.4 grams.
What is potassium bromide?Potassium bromide is an ionic compound formed from combination of potassium and bromine atom involving the loss of electron from the potassium metal to the bromine atom.
The atomic mass of potassium (K) = 39 g/mol
atomic mass of Br = 79 g/mol
Hence, the molar mass of KBr = 79 + 39 = 118 g/mol
Therefore , the mass of one mole of KBr is 118.
The mass in grams of 9.3 moles of potassium bromide is thus, 9.3 times the mass of one mole of KBr. Thus,
mass of 9.3 moles = 9.3 × 118 = 1097.4 g.
Therefore, the mass in grams of 9.3 moles of KBr is 1097.4 g.
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The first step in the scientific method usually is:
A:formulate a conclusion
B:conduct an experiment
C: develop a hypothesis
D: ask a question
Answer:
ask a question
Explanation:
You have to ask a question or solve a problem before you can develop a prediction/hypothesis, conduct an experiment or even make a conclusion. The question comes first.
Which factor most directly affects potential energy but not kinetic energy?
O Mass
O Density
O Velocity
Elasticity
On the periodic table, periods are elements with similar
O Atomic Number
O Atomic properties
O Atomic Mass
O None of the Above
Answer:
B.) Atomic Properties
can I have brainliest?
[tex]Have\\a\\nice\\day[/tex]
Question 1 (1 point)
ROOTS--What is NOT a root function in plants?
Answer:
deez nuets
Explanation:
bf gm Jr rj if dl if did fll j fll kd golf du is no u to
What is the relationship between a chemical equation and a chemical reaction? What are reactants and products in a chemical equation?
Answer:
A chemical reaction occurs when reactants are converted into products. A chemical equation is a representation of a chemical reaction using chemical symbols. The chemical equation also indicates the physical state of the reactants and products. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Explanation: because UwU
A chemical equation is an expression that gives the identities and quantities of a chemical reaction. A chemical equation shows the reactants on the left side and the products on the right which are separated by an arrow.
What is the chemical equation?A chemical equation is the representation of a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating in the reaction, formed products, and an arrow showing the direction of the chemical reaction.
The equation in which the number of atoms of substances is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass follows by a balancing of a chemical equation. According to this law, in a chemical reaction, the mass can neither be created nor destroyed.
By obeying this law, the total mass of the elements present on the reactant side should be equal to the total mass of elements present on the product side in a balanced chemical equation.
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Why are the magnetic field lines closest together at the poles?
Easy points
Please help quickly
Part 2: Determining Similarities
Using only the groups of the periodic table, choose one element that is chemically similar to each of the
following elements
Carbon
Cesium
Krypton
Magnesium
Aluminum
Bromine
Answer:
Magnesium, strontium, and barium belong to group 2A of the periodic table.
Diploid cells have:
a. the regular number of chromosomes of the parent organism
b. twice the number of chromosomes of the parent organism
c. half the chromosomes of the parent organism
Answer:
c
Explanation:
Bullets have only class characteristics, not individual characteristics.
A. True
B. False
Answer:
B false
Explanation:
The atomic number of an element is 11. What is the likely arrangement of the valence and core electrons in a neutral atom of this element?
Answer:
The correct answer is 10 core electrons and one valence electron.
Explanation:
The electrons in an atom, which are not valence and do not take part in chemical bonding are known as core electrons. The core electrons and the nucleus of an atom produces the atomic core. These core electrons are held tightly with the nucleus. On the other hand, the outer shell electrons, which are associated with an atom and take part in the generation of a chemical bond is the outer shell is open are known as valence electrons.
In the given question, the atomic number of an element is 11, thus, the electronic configuration will be,
1S² 2S² 2P⁶ 3S¹
Hence, there is only one valence electron and 10 core electrons.
Li+ is an ion that has lost 1 electron in order to have a full valence shell, making Li+ a cation. What charge does the element Be (beryllium) hold? Predict what elements will bond with Be in order for it to reach stability.
Answer:
See the answer below
Explanation:
Beryllium forms an ion with 2 electrons in its outermost shell. Hence the charge on the element is 2+, that is, Be2+. In order for Be to form a stable bond with another element, such an element must have a deficit of electrons in its outermost shell. Beryllium will have to donate its 2 electrons to this element for its self-stability.
11. When a plant is growing, coming into view that is known as:
A.Photosynthesis
B. Emergence
C.Xylem
D. Phloem
Answer:
B
............. M
Explanation:
Emergence
What makes up an ionic compound?
A. A positive anion and a negative cation
B. A positive cation and a positive anion
C. A negative anion and a negative anion n
D. A positive cation and a negative anion
Pick all that apply
Answer: B
Explanation: Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.)
What is the definition of epinephrine?
a stress hormone
a secretion of the synapses
a signal in the frontal lobe
a sex hormone
Answer:
a stress hormone is epinephrine
What type of weather fronts are close to New York
The climate of New York is continental, with cold winters and hot summers. The daily average temperature ranges from 0.5 °C (33 °F) in January to 24.5 °C (76 °F) in July.
(hope this helps ^^)
Why it is important to replicate scientific experiments?
to detect mistakes
to confirm findings
to introduce more variables
to produce more trials with data
Its A CUHH!!!!!!
WHY???- BC I SAID SO CUHH