Answer:
lithium, beryllium, boron, carbon, oxygen, fluorine and neon
Explanation:
There are eight elements in the second row (lithium to neon) of the periodic table as the second row can has 2 shells and second shell has maximum capacity of 8 electrons.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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mineral acids are also classified as????
An inorganic acid......
Commonly used mineral acids are sulfuric acid, hydrochloric acid and nitric acid (they are also known as bench acids). Mineral acids range from superacids (perchloric acid) to very weak ones(boric acid). Mineral acids tend to be very soluble in water and insoluble in organic solvents.
Please help asap!!!!!!!
Answer:
30
Explanation:
One significant difference between gases and liquids is that:
A) a gas assumes the shape of its container, a liquid does not
B) a gas is made up of molecules, a liquid is not
C) a gas assumes the volume of its container, a liquid does not
D) None of all
E) a gas is always a mixture, a liquid is not
F) a gas may consist of both elements and compounds, a liquid may not
Answer:
A
Explanation:
all the other answers are wrong or not applicable. hope this helps :)
You push on an object for 3 seconds. During those 3 seconds, the object 10 points
moves 0.65 m. After you stop pushing, the object moves another 0.20 m.
Which distance should you use to calculate work?*
A 0.20 m
B 0.65 m
C 0.85 m
Answer:
C.) 0.85m
Explanation:
If you moved it for 3 seconds and it went 0.65m then continued to move for another 0.20m you would just add the two numbers together.
0.65+0.20=0.85m
What is the volume percentage of 18 L of isopropanol in 45 L of water?
The volume percentage of 18 L of isopropanol in 45 L of water is 28.57%
Total solution = volume of water + volume of isopropanol
Total solution = 18L + 45L
Total solution = 63L
Volume of isopropanol = 18L
% volume of 18L isopropanol = 18/63 * 100
% volume of 18L isopropanol = 1800/63
% volume of 18L isopropanol = 28.57%
Hence the volume percentage of 18 L of isopropanol in 45 L of water is 28.57%
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MgCl,
+
K—>
balance the equation
Answer:
MgCl2 +2K= 2KCl+ Mg
Explanation:
I think MgCl2 you meant
A chemist carefully measures the amount of heat needed to raise the temperature of a 1.05 kg sample of a pure substance from 1.9 °C to 19.7 °C. The
experiment shows that 4.39 kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the
correct number of significant digits.
х
?
Now
[tex]\\ \sf\longmapsto Q=mc\Delta T[/tex]
[tex]\\ \sf\longmapsto c=\dfrac{Q}{m\Delta T}[/tex]
[tex]\\ \sf\longmapsto c=\dfrac{4390}{1.95(17.8)}[/tex]
[tex]\\ \sf\longmapsto c=\dfrac{4390}{18.69}[/tex]
[tex]\\ \sf\longmapsto c=234.8J/kg°C[/tex]
ecuación iónica de
Ba(CIO4)2 y K2SO4.
i don't remember yeah yosj
can anyone heelp me plz plz
Answer: C=1
Explanation: If you round 1.04 to a single digit its 1
FIVE SENTENCES OR MORE
All of your body’s cells need oxygen and all of your body’s cells produce carbon dioxide. Name and describe how the organ systems pictured above work together to:
1. Get oxygen to your body.
2. Distribute oxygen throughout your body.
3. Get rid of carbon dioxide your body produces.
Answer:
Explanation:
In the tiny capillaries of the body tissues, oxygen is freed from the hemoglobin and moves into the cells. Carbon dioxide, made by the cells as they do their work, moves out of the cells into the capillaries, where most of it dissolves in the plasma of the blood.
Blood rich in carbon dioxide then returns to the heart via the veins. From the heart, this blood is pumped to the lungs, where carbon dioxide passes into the alveoli to be exhaled.
HELP PLS (CHEMISTRY)
How is writing formulas for ionic compounds with transition metals different from the regular metals?
The first most obvious thing to note is when naming transitional metals, you have to state its charge with roman numerals (except for 1 if I remember correctly). For example, Iron (lll), iron has a charge of 3.
this illustration shows a kind of animal that is a free living organism. what is the common name of this organism?
amoeba
fluke
planarian
tapeworm
Answer:
Planarian
Explanation:
The chemical symbol for helium is H
Answer:No, it is He
Mark me brainlieist
What is the daily functions of the Stomach and Intestine?
I need the correct answers now please!!
Answer
Your stomach is a muscular organ that digests food. It is part of your gastrointestinal (GI) tract. When your stomach receives food, it contracts and produces acids and enzymes that break down food. When your stomach has broken down food, it passes it to your small intestine.
Explanation:
Assuming that the volumes are additive, and the gases behave ideally, calculate the entropy of 12.0 L of N2 with 4.00 L of N2O at 250 K and 0.550 atm. (20 points) Write a meaningful comment on your findings. (5 points)
This problem is describing a gaseous system composed by 12.0 L of nitrogen and 4.00 L of dinitrogen monoxide at 250 K and 0.550 atm. In addition, it is asking for the entropy of the system assuming it is ideal and the volumes are additive; this means we can use the following equation for the entropy of the mixture:
[tex]S_{mix}=-n_{N_2}*R*ln(\frac{n_{N_2}}{n_{N_2}+n_{N_2O}} )-n_{N_2O}*R*ln(\frac{n_{N_2O}}{n_{N_2}+n_{N_2O}} )[/tex]
It means we need to calculate the moles of both gases, which can be obtained by using the ideal gas equation for the common T,P conditions and the volume of each gas:
[tex]n_{N_2}=\frac{PV_{N_2}}{RT} =\frac{0.550atm*12.0L}{0.08206\frac{atm*L}{mol*K}*250K} =0.322mol\\\\n_{N_2O}=\frac{PV_{N_2O}}{RT} =\frac{0.550atm*4.00L}{0.08206\frac{atm*L}{mol*K}*250K} =0.107mol[/tex]
Next, we recall the aforementioned equation for the calculation of the entropy and plug in the values:
[tex]S_{mix}=-8.3145\frac{J}{mol*K}[0.322mol*ln(\frac{0.322mol}{0.322mol+0.107mol} )+0.107mol*ln(\frac{0.107mol}{0.322mol+0.107mol} )]\\\\S_{mix}=2.00\frac{J}{mol*K}[/tex]
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For which properties can a student design an investigation of the electrostatic forces between molecules in a substance?
A. melting point and boiling point, but not surface tension and vapor pressure
B. surface tension and vapor pressure, but not melting point and boiling point
C. boiling point, but not melting point, surface tension, or vapor pressure
D. melting point, boiling point, surface tension, and vapor pressure
To determine the melting point of ice, which procedure would best help measure the melting point temperature?
A. Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.
B. Mix ice with water until equilibrium is reached but some ice remains that is still melting.
C. Mix ice with water until just before equilibrium is reached but some ice remains that is no longer melting.
D. Mix ice with water until just before equilibrium is reached but some ice remains that is still melting.
Answer:
1. D: melting point, boiling point, surface tension, and vapor pressure
2. I’m not too sure about the second one. Maybe D Mix ice with water until just before equilibrium is reached but some ice remains that is still melting. However I am unsure. So do not take my word for it
Explanation:
The properties that a student can design an investigation of the electrostatic forces between molecules in a substance are melting point, boiling point, surface tension, and vapor pressure.
To determine the melting point of ice, which procedure would best help measure the melting point temperature is to Mix ice with water until equilibrium is reached but some ice remains that is still melting.
Intermolecular forces are regarded as the forces of attraction or repulsion that exist or act between close particles of atoms, molecules, or ions.
The slow heating rate at the melting point is important in order to get an the measurement.
When an individual heat ice, its temperature often rises, but as soon as the ice starts to melt, the temperature stays constant until all the ice has melted.
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What is the molar solubility of magnesium oxalate Mg(C2O4 ) in water?
The solubility-product constant for MgC2O4 is 8.6 × 10-5
A) 4.3 × 10-5 mol/L
B) 1.7 × 10 -4 mol/L
C) 8.35 mol/L
D) 1.3 × 10-2 mol/L
E) 9.3 × 10-3 mol/L
Answer:
had this quetionn
Explanation:
B :))
The molar solubility of magnesium oxalate Mg(C2O4 ) in water is 9.3 x 10⁻³ mol/L. So, the correct option is D.
What is meant by molar solubility ?Molar solubility of a substance is defined as the number of moles of solute that can be dissolved to make one litre of a saturated solution.
Here,
The solubility product constant of magnesium oxalate, Ksp = 8.6 x 10⁻⁵
The reaction for dissociation of magnesium oxalate in water can be written as,
MgC₂O₄ + H₂O ⇆ Mg²⁺ + C₂O₄²⁻
Magnesium oxalate is a binary salt.
So,
The molar concentration of Mg²⁺ = molar concentration of C₂O₄²⁻
[Mg²⁺] = [C₂O₄²⁻] = x
The solubility product constant of MgC₂O₄,
Ksp = [Mg²⁺] [C₂O₄²⁻]
Ksp = x²
Therefore,
Molar solubility of MgC₂O₄,
x = √Ksp
x = √8.6 x 10⁻⁵
x = 9.3 x 10⁻³ mol/L
Hence,
The molar solubility of magnesium oxalate Mg(C2O4 ) in water is 9.3 x 10⁻³ mol/L.
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which turkey (15lb or 25lb) will thaw faster and why?
Answer:
15lb
Explanation:
A 15lb pound of turkey will thaw faster compared to 25lb because it's not only smaller but the weight of the turkey affects how temperature circulates throughout.
Hope this helps :)
The turkey weighing 15 lb will thaw faster as it has lesser mass, and required less time.
Thawing has been the process of warming up the substance for converting freezed to a soft liquid and solid. The time required for thawing has been proportional to the energy required to change the substance state.
The turkey has been given of weight 15 lb and 25 lb. The more the weight, there has been more energy has been required for thawing.
Thus, 15 lb turkey will thaw faster as compared to the 25 lb turkey.
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what is the fnction of a cell membrance
Answer:
Maybe to hold the whole parts of the cell
Which two statements are true? A. Each particle of a compound consists of a single type of atom. B. All particles of a compound have the same chemical formula. C. The atoms in a particle of a compound are held together by chemical bonds. D. Different kinds of matter in a compound can be separated by physical means.
Answer: A and C
Explanation: For example, the compound HCl (hydrogen chloride) is comprised for 2 different types of atoms: one hydrogen and one Chlorine. In order to fuse these two elements together to form a compound, they must bond in one of three ways- ionic, covalent or metallic
The two statements that are true are as follows:
All particles of a compound have the same chemical formula.The atoms in a particle of a compound are held together by chemical bonds.Thus, the correct options for this question are A and C.
What is a Chemical compound?A chemical compound may be defined as a type of chemical substance that is mainly composed of many similar molecules that contain atoms of more than one chemical element. These atoms are typically held together by chemical bonds.
If you take the example of NaOH where you will find three elements such as sodium, oxygen, and hydrogen. Each of these chemical elements is held together by chemical bonds in order to form sodium hydroxide.
The atoms of sodium hydroxide would not change their chemical formula when it is present as a chemical compound.
Therefore, the correct options for this question are A and C.
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The Lewis dot model of a molecule (Phosphorous Chloride) is shown.
A. The electronegativity difference between phosphorous and chlorine is greater than 1.7.
B. Each chlorine has three non-bonded pairs and one bonded pair of electrons.
C.Phosphorous has three non-bonded pairs and one bonded pair of electrons.
D.Phosphorous has three valence electrons in the outermost energy level.
Answer:
B
Explanation:
Each chlorine atom has 7 valence electrons. One from each of the Chlorine atoms bonded with one Phosphorous atom, leaving the rest of the pairs, 3 pairs each adding up to six, unbonded
The Lewis dot model of a molecule ( Phosphorous Chloride ) is each chlorine has three non-bonded pairs and one bonded pair of electrons. Therefore, option B is correct.
What is lewis model ?Lewis' model demonstrated that, as long as the opportunity cost of labor to the capitalist sector is low, low wages and poverty will continue to exist in a labor surplus economy.
The Richard Lewis model of cultural diversity proposes that all cultures can be divided into three categories: linear-active, multi-active, and reactive. The Lewis model is a triangle made up of these three distinctly different cultural groupings.
The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
Thus, option B is correct.
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The arrow and
blue colored
blocks indicate
the
elements.
NO LINK
Answer:
The arrow and blue colored blocks indicate the transition metal elements
Explanation:
B.
"The arrow and blue colored blocks in periodic table indicate transition elements. "
What is transition elements?
The type of elements in which the last electrons enter into d-orbital can be referred to as transition elements. They can be placed in the middle of the periodic table. they are indicated with blue color in the periodic table so that it is easy to identify transition element in periodic table. Transition elements can show colored property because it shows d-d transition.
The electronic configuration of transition elements can be shown as:
(n-1)[tex]d^{1-10}[/tex]n[tex]s^{1-2}[/tex].
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Can you guys help me answer this ?
Answer:
the picture is kinda blurry
Explanation:
compare how the water particles in the pot are behaving to how the water particles in the steam above the pot are behaving.
Answer: If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapor as it gets warmer.
The water particles in a pot of boiling water are behaving very differently from the water particles in the steam above the pot.
The water particles in the pot are tightly packed together. They are constantly moving, but they are not free to move around as much as the water particles in the steam.
The water particles in the steam are much farther apart. They are also moving much faster than the water particles in the pot. This is because the steam has been heated to the boiling point, which means that the water molecules have enough energy to escape from the liquid state and become a gas.
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Describe how cooking marshmallows over a campfire could demonstrate all three forms of heat transfer.
EFFECTS Of The
HUMAN INTERVATION OF THE
CARBON CYCLE.
Explanation:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... This extra carbon dioxide is lowering the ocean's pH, through a process called ocean acidification.
A fuel was burned for 5 min, increasing the temperature of 10.0 g of water with a density of 1.00 g/ml by 9.0 oC. The fuel released _____ ca
The fuel released 90 calories of heat.
Let suppose that water experiments an entirely sensible heating. Hence, the heat released by the fuel is equal to the heat absorbed by the water because of principle of energy conservation. The heat released by the fuel is expressed by the following formula:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the sample, in grams.[tex]c[/tex] - Specific heat of water, in calories per gram-degree Celsius.[tex]\Delta T[/tex] - Temperature change, in degrees Celsius.If we know that [tex]m = 10\,g[/tex], [tex]c = 1\,\frac{cal}{g\cdot ^{\circ}C}[/tex] and [tex]\Delta T = 9\,^{\circ}C[/tex], then the heat released by the fuel is:
[tex]Q = (10\,g)\cdot \left(1\,\frac{cal}{g\cdot ^{\circ}C} \right)\cdot (9\,^{\circ}C)[/tex]
The fuel released 90 calories of heat.
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help me plEaseeeeee im so confused
Answer:
I believe it the last one it make the most sense
Which products are the result of a neutralization reaction? (1 point)
A)hydrogen and hydroxide
B)water and a salt
C)a titrant and an analyte
D)an acid and a base
Answer:
B) water and salt is the result of neutralization reaction
Water and salts are the product of a neutralization reaction.
NEUTRALIZATION REACTION:
Neutralization reaction is a type of reaction between an acid and a base to form a salt and water. In a neutralization reaction, the hydrogen ion (H+) and hydroxyl ion (OH-) are released from the acid and base respectively and are combined to form water. An example is the reaction between hydrochloric acid (HCl) as an acid and sodium hydroxide (NaOH) as a base to form sodium chloride (NaCl) as salt and water (H2O). Therefore, water and salts are the product of a neutralization reaction.Learn more at: https://brainly.com/question/20038776?referrer=searchResults
what is the volume of 2.00 moles of chlorine (Cl2) at STP, to the nearest tenth of a liter? STOICHIOMETRY 1mole=22.4L
