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
Which factor most directly affects potential energy but not kinetic energy?
O Mass
O Density
O Velocity
Elasticity
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.
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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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 is the mass of 35.0L of oxygen?
Answer:15.9994 g/mol
Explanation:
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.
1/4 checkpoint
Time of Trial #1 (s)
2. 15
Time of Trial #2 (s)
Time of Trial #3 (s)
Average time (s)
2.05
2.02
2.07
Use the table to answer the questions.
What is the fastest time trial for the first quarter checkpoint?
seconds
What is the slowest time trial for the first quarter checkpoint?
seconds
What is the range of times measured for this checkpoint?
Answer:
here's the answers
Explanation:
Answer:
1. 2.02
2. 2.15
3. 0.13
Explanation:
doing it now of EDG :)
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
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 do scientists use gamma rays for?
Answer: To determine the elements on other planets. The Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) Gamma-Ray Spectrometer (GRS) can measure gamma rays emitted by the nuclei of atoms on planet Mercury's surface that are struck by cosmic rays.
Explanation:
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.
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:
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
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 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 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 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.
3 examples of density synonyms
frequency.
quantity.
thickness.
body.
closeness.
concretion.
heaviness.
solidity.
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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!!please help asap ty only if you can ty!!!
2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89 × 10²³ atoms of zincExplanation:
The number of atoms of zinc can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.48 × 6.02 × 10²³
We have the final answer as
2.89 × 10²³ atoms of zincHope this helps you
Answer:
2.89× 10²³ atom
Explanation:
Given data:
Number of atoms of Zn = ?
Number of moles of Zn = 0.48 mol
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
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
Which two large landmasses formed when Pangaea first started to separate?
Answer:
Laurasia and Gondwanaland
Explanation:
Answer:
D
Explanation:
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]
How many joules of energy are required to vaporize 512.0 g of water?
Answer:
The heat required to evaporate 512 g of water initially at 0°C is 1,371,340.8 J
Explanation:
The given parameters are;
The mass of water given in the question = 512.0 g
The specific heat capacity of water = 4.184 J/(g·°C)
The heat of vaporization of water = 2,260 J/g
The heat, Q, required to raise the temperature of 512.0 g from 0°C to 100°C is given as follows;
Q = 512 × 100 × 4.184 = 214,220.8 J
The heat required to vaporize 512.0 g of water at 100°C = Mass × Heat of Vaporization
The heat required to vaporize 512.0 g of water at 100°C = 512 × 2260 = 1,157,120 Joules = 1,157.12 kJ
The heat required to evaporate 512 g of water initially at 0°C is therefore;
214,220.8 J + 1,157,120 J = 1,371,340.8 J.
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.
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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