Chemistry High School
Answers
Answer 1
D I have a good feeling about d
Related Questions
State the trend in chemical reactivity as we go down the group for Group I elements Account for
this trend using the electronic structures of the elements.
Answers
Answer: The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
Because both tin and carbon are members of Group 4A(14), they form structurally similar compounds. However, tin exhibits a greater variety of structures because it forms several ionic species. Predict the shape and ideal bond angle, including any deviations, for SnCl3−.
Answers
Answer:
See Explanation
Explanation:
Elements in group fourteen are mostly known to form compounds in which there are four electron domains leading to a tetrahedral electron domain geometry.
However, the presence of lone pairs affects the shape of the molecule. SnCl3− has four electron domains, three of them are bond pairs while one is a lone pair. The shape of the molecule is based on a tetrahedron, however the observed geometry is trigonal pyramidal due to the presence of the lone pair. Its bond angle is now less than the predicted 109 degrees.
Convert 4.00 atm to mmHg
Group of answer choices
404 mmHg
2430 mmHg
.746 mmHg
3040 mmHg
Answers
Answer:
3040 mmHg
Explanation:
Here
we have to convert 4.00 atm to mmHg
As we know that
The number of atm in 1 mmHg is 0.0013157895567935
Now there is 4.00 atm So, in mmHg it would be
And, according to this, the working is given below:
= 4 ÷ 0.0013157895567935
= 3,039.99
= 3040 mmHg
Hence, the last option is correct
And, the same is relevant and considered too
A liquid changes color as it cools and becomes solid. How can you confirm
the type of change that took place?
A. Determining that the mass of the solid and liquid are different
would confirm that a chemical change took place.
B. Identifying the solid and liquid as the same substance would
confirm that a physical change took place.
O c. The color change and the formation of a solid confirm that a
chemical change took place.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Answers
Answer: Hello, There! your answer is Below.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
Hope this helps you!!!
Have a great day!!!
When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.
What are physical changes?
Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.
The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.
Therefore, option D. solid from liquid shows a physical change.
Learn more about physical change here:
https://brainly.com/question/17931044
#SPJ2
What is the mass number and atomic number of Ca0
Answers
Answer:
56.0774g/mol
Explanation:
hope you like it ☺️
There is 1 mole of propane (C3H8) for every 3 moles CO2. How many moles of CO2 would there be if you started with 2 moles of propane instead of 1?
Answers
Answer:
[tex]1 \: mole \: of \: propane \: reacts \: with \: 3 \: moles \: of \: carbondioxide \\ 2 \: moles \: of \: propane \: react \: with \: \frac{2 \times 3}{1} moles \\ = 6 \: moles \: of \: carbondioxide[/tex]
A chemist sets up a chemical reaction but finds that none of the reactant molecules have the required activation energy. What is the result
Answers
Answer:
No reaction is observed
Explanation:
The activation energy is the minimum energy that reactants must have in order to cross the energy barrier and become converted into products.
When reactant molecules do not possess the required activation energy, collision between the reactant molecules becomes purely elastic and no reaction occurs.
Hence, colliding reactant molecules are only converted into product molecules when they possess the required activation energy.
. How many grams of Na2SO4 are required to make 2700 mL of a 2.0 M solution?
Answers
Answer:
Explanation:
From the net ionic equation
Ba2+(aq) + SO42-(aq) ==> BaSO4(s) we see that 1 mole Ba2+ reacts with 1 mole SO42- to -> 1 mol BaSO4
Find moles of Ba2+ used: 0.250 moles/L x 0.0323 L = 0.008075 moles Ba2+
Find moles SO42- present: 0.008075 moles Ba2+ x 1 mol SO42-/1 mol Ba2+ = 0.008075 mol SO42-
Find mass of Na2SO4 present: 0.008075 mol SO42- x 1 mol Na2SO4/1 mol SO42- x 142.04 Na2SO4/mole = 1.14698 g = 1.15 g Na2SO4 (to 3 significant figures)
Answer: Approx 2kg of salt are required.
Explanation: If 4.5 ⋅ L of a 3.0 ⋅ m o l ⋅ L − 1 solution are required, this is a molar quantity of 4.5 ⋅ L × 3.0 ⋅ m o l ⋅ L − 1 = 13.5 ⋅ m o l . Now, we simply multiply this molar quantity by a molar mass to get the mass: 13.5 ⋅ m o l × 142.04 ⋅ g ⋅ m o l − 1 = ? ? ⋅ g
Which of the following elements has the largest atomic number?
cobalt, Co
O titanium, Ti
scandium, SC
nickel, Ni
Answers
Answer:
O titanium, Ti
Explanation:
De quelle atome dérive le néon svp
Answers
Answer:
sorry
Explanation:
sorry I don't know language
how many teaspoons of jelly would be required to use 36 slices of bread?
Answers
Answer:
depends on how much jelly u like
A sample compound with a molar mass of 34.00g/mol is found to consist of 0.44g H and 6.92g O. Calculate both empirical and molecular formulas.
Answers
Answer:
E.F= OH
M.F=[tex]O_{2} H_{2}[/tex]
Explanation:
Empirical Formula
Step 1: Calculate mols of each element
0.44gH(1 mol H/ 1.008g H)= 0.4365 mol H
*note leave extra sig figs for calculations
6.92gO(1 mol O/ 16 g O)=0.4325 mol O
Step 2: Identify which is the smallest mol
*in this case 0.4365 mol H> 0.4325 mol O so we will use 0.4325 mol O
Step 3: Divide above calculations by the smallest mol
0.4325 mol O/0.4325= 1
0.4365 mol H/0.4325= 1.009 *rounds to 1
Step 4: use calculations as subscripts
Oxygen = 1 so the subscript will 1 (O)
Hydrogen = 1 so the subscript will 1 (H)
making E.F= OH
Molecular Formula:
Step 1: identify molecular mass and mass from the E.F
the molecular mass is given 34.00g/mol
the mass of the E.F is
(oxygen mass from periodic table)+(hydrogen mass from periodic table)
16+1.008= 17.008
Step 2:Divide the molecular mass by the mass given by the emipirical formula.
[tex]\frac{34.00}{17.008}= 1.999[/tex] round to 2
Step 3:Multiply the empirical formula (the subscripts) by this number to get the molecular formula. ANSWER: M.F=2(OH)- [tex]O_{2} H_{2}[/tex]
The photos below show four pairs of objects.
Person and dog
Person and Earth
Person and building
Person and ball
Which pair of objects is experiencing the greatest gravitational force?
A. The person and the ball
B. The person and Earth
C. The person and the dog
D. The person and the building
Answers
Answer:
person and earth since they are closer to the core ? maybe
How many moles are in 100 grams of gold?
Answers
Answer:
0.01 mole
Explanation:
A certain metal M forms a soluble sulfate salt M2SO4. Suppose the left half cell of a galvanic cell apparatus is filled with a 50.0mM solution of M2SO4 and the right half cell with a 5.00M solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 20.0°C.
Which electrode will be positive?
Left
Right
Answers
Answer:
Right
Explanation:
The given parameters are;
The soluble sulfate formed by the metal, M = M₂SO₄
In the galvanic cell formed by the metal M, we have;
The concentration of M₂SO₄ in the left half cell = 50.0 mM = 0.05 M
The concentration of M₂SO₄ in the right half cell = 5.00 M
In the galvanic cell, the metal 'M' will be dissolved into the solution with lower concentration as M²⁺ which is the left half cell, making the cell negative and the solution more concentrated
In the right half cell, the metal 'M²⁺' in the solution will be plated unto the electrode making the solution less concentrated and the electrode in the right half cell will be the positive electrode
Therefore;
The electrode which will be positive is the electrode in the right half cell.
CH4 + O2 → CO2 + H2O
How many molecules of water can be formed by the combustion of 130 g of methane?
Answers
Answer:
9.8 × 10²⁴ molecules H₂O
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Organic
Naming carbons
Stoichiometry
Analyzing reaction rxnUsing Dimensional Analysis
Explanation:
Step 1: Define
[RxN - Unbalanced] CH₄ + O₂ → CO₂ + H₂O
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 130 g CH₄
Step 2: Identify Conversions
Avogadro's Number
[RxN] 1 mol CH₄ → 2 mol H₂O
[PT] Molar Mass of C: 12.01 g/mol
[PT] Molar Mass of H: 1.01 g/mol
Molar Mass of CH₄: 12.01 + 4(1.01) = 16.05 g/mol
Step 3: Stoichiometry
[DA] Set up conversion: [tex]\displaystyle 130 \ g \ CH_4(\frac{1 \ mol \ CH_4}{16.05 \ g \ CH_4})(\frac{2 \ mol \ H_2O}{1 \ mol \ CH_4})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 9.75526 \cdot 10^{24} \ molecules \ H_2O[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
9.75526 × 10²⁴ molecules H₂O ≈ 9.8 × 10²⁴ molecules H₂O
Hydrogen chloride gas reacts with water to produce an acidic solution. The equation for
the reaction is shown.
HCI + H2O → CI + H2O
Which statement describes what happens during the reaction?
A The chloride ion is formed by accepting an electron from the water.
B The hydrogen chloride loses an electron to form the chloride ion.
C The water accepts a proton from the hydrogen chloride.
D The water donates a proton to the hydrogen chloride.
neid.
Answers
Answer:
C The water accepts a proton from the hydrogen chloride.
Explanation:
The equation given in this question where hydrogen chloride reacts with water is as follows:
HCI + H2O → CI- + H3O+
From this equation, hydrogen chloride (HCl) loses or donates hydrogen ion (H+) or proton to water (H2O), which accepts it to become hydronium ion. Hence, in a nutshell, water (H2O) accepts a proton (H+) from the hydrogen chloride (HCl) in this reaction.
A sample of Cd(OH)2 is added to pure water and allowed to come to equilibrium at 25ºC. The concentration of Cd +2 = 1.7 x 10 -5M at equilibrium. Calculate Ksp.
Answers
Answer:
[tex]Ksp=2.0x10^{-14}[/tex]
Explanation:
Hello there!
In this case, given the solubilization of cadmium (II) hydroxide:
[tex]Cd(OH)_2(s)\rightleftharpoons Cd^{2+}(aq)+2OH^-(aq)[/tex]
The solubility product can be set up as follows:
[tex]Ksp=[Cd^{2+}][OH^-]^2[/tex]
Now, since we know the concentration of cadmium (II) ions at equilibrium and the mole ratio of these ions to the hydroxide ions is 1:2, we infer that the concentration of the latter at equilibrium is 3.5x10⁻⁵ M. In such a way, the resulting Ksp turns out to be:
[tex]Ksp=(1.7x10^{-5})(3.4x10^{-5})^2\\\\Ksp=2.0x10^{-14}[/tex]
Regards!
11. Write each step of uranium-240 undergoing first an alpha decay then two rounds of beta decay.
Pls HURRY HELPPP MEEEE
Answers
lanation:
ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
210
84
Po
⟶
4
2
He
+
206
82
Pb
or
210
84
Po
⟶
4
2
α
+
206
82
Pb
What kind of label is one that is affixed to a chemical container and displays the chemical name, potential hazards, precautions, supplier information, and written and graphic hazard warnings
Answers
Answer:
Manufacturer's label
Explanation:
In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, natural resources and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act.
The Environmental Protection Agency (EPA) is the governmental agency set up to ensure that various industries, factories and people comply with laws and regulations concerning the environment i.e it is an agency established to oversee and enforce environmental compliance by the people.
According to EPA, it's mandatory that companies that are into the production of toxic and potentially hazardous chemicals affix a label to the container of their products.
Hence, a manufacturer's label is a kind of label affixed to a chemical container by the manufacturers to display the chemical name, potential hazards, precautions, supplier information, and written and graphic hazard warnings for better understanding and proper use by the end users.
The manufacturers label is the one, which is affixed to a chemical container and displays the chemical name, precautions, potential hazards, supplier information, and graphic and written hazard warnings.
•According to the Hazard Communication Standard or HCS, the labels refer to an appropriate group pf printed, written, or graphic informational elements concerning a hazardous chemical, which are affixed to, attached or printed to the immediate container of a hazardous chemical.
•The HCS needs the chemical manufacturers to ensure that each container of hazardous chemicals leaving the workplace is tagged, labelled, or marked with the product identifier, hazard statement, signal word, precautionary statements, and pictograms. Such labels are termed as the manufacturer's label.
Thus, it the manufacturer's label, which is affixed to a chemical container and displays the chemical name, precautions, potential hazards, supplier information, and graphic and written hazard warnings.
To know more about:
https://brainly.com/question/5016331
The Sun’s Influence on Atmosphere and Oceans
Note-taking Guide
Directions: Complete the note-taking guide using the words in the word bank below. To enter your answers, click on the blanks and type.
weather hurricanes poles convection currents warming salt
global conveyor belt surface currents dense equator
Loop Current salinity climate heat cooling wind
The Sun is the main energy source on Earth. Approximately
50%
of the
solar energy hitting Earth is absorbed by land and oceans.
This absorbed energy changes into
which can be transferred to
the atmosphere. As the air in the atmosphere then gets heated, it becomes
less
and rises.
Cool, dense air from other places flows in to replace this warm air, which we
feel as
.
This cool air eventually heats and starts to rise again. This continual process
of air closest to Earth’s surface warming, rising, cooling, and then sinking
creates
in the atmosphere.
Atmospheric winds that blow over the ocean surface create
that carry water around the globe.
Unequal heating of the oceans and differences in
also
create currents.
The Sun warms water at the
more than it does at the
high latitude Polar regions.
At the
, some water freezes. The water that doesn’t freeze
contains more
, making it denser.
As this cold, dense water sinks, the warm water from the equator moves
toward the poles to replace it.
This constant movement creates a deep ocean current called the
.
The global conveyor belt transfers heat from one part of the world to the
other, thus affecting the
and
in all parts
of the world.
Surface and deep ocean currents continually transfer warm and cold waters
around the globe.
As these waters warm or cool the air above it, winds blow the air over land,
it up or
it down.
The
in the Gulf of Mexico is an ocean current
that creates a warm layer of water in the gulf. This results in the growth of
several
that affect the Gulf Coast.
Answers
Answer:
bestie this is like 6th grade stuff
Explanation:
Graded Assignment
SCI010: Environmental Science Unit 2 Lesson 20: Unit Test
(8 points)
Score
2. What is an environmental sphere or earth system sphere? Name the earth's five major environmental spheres
and state the defining characteristics of each. Give one example of a way in which two or more earth system
spheres interact.
Answer:
Answers
Answer:
Geosphere, biosphere, cryosphere, hydrosphere, and atmosphere
Explanation:
The environmental sphere refers to all physical entities other than products and corresponding flows. . Geosphere, biosphere, cryosphere, hydrosphere, and atmosphere are the five major environmental spheres. Geosphere consist of the rocks, minerals, and landforms of the surface and interior. Biosphere includes all living organisms present on earth surface. cryosphere refers to the solid water part of the earth. Hydrosphere refers to the water bodies such as river, lakes, sea and ocean etc and the atmosphere is the gaseous region of earth which is composed of many gases.
electronic configurations and charges of the ions
in lithium fluoride?
Answers
Answer:
Explanation:
The electronic configuration of a lithium atom is 2.1 and that of a fluorine atom is 2.7
an atom of lithium donates an electron to an atom of fluorine to form an ionic compound. The transfer of the electron gives the lithium ion a net charge of +1, and the fluorine ion a net charge of -1.
8. Which of the following is not considered to be a unicellular organism? O A. Flea O B. Euglena C. Amoeba O D. Paramecium
Answers
I think it is C. Amoeba
Assess It!
#2
Which image best
represents the location of
the Sun in the Milky Way
galaxy?
Answers
Option C is the correct answer. The Orion Arm, also known as the Orion Spur, is a short, incomplete arm between the Sagittarius and Perseus arms that is close to where our Sun is positioned.
What kind of star is our Sun, and where in the Milky Way galaxy is it situated?
Response and justification Our sun is situated on one of the spiral galaxies, known as the Orion Arm, in the Milky Way galaxy. When compared to the other stars in the cosmos, the sun is regarded as a little staror yellow dwarf.
What is the Milky Way's large Sun?
Around the Milky Way's nucleus, the star is located approximately 9,500 light-years from Earth. UY Scuti is a hypergiant star that may be found in the constellation Scutum.
Which phrase best sums up the Sun and Milky Way?
The Milky Way galaxy, which has an uneven form, has the Sun as a dwarf star towards its edge. The Milky Way is a disc-shaped galaxy, and the Sun is a big star located close to its center.
To know more about the milky way visit:
https://brainly.com/question/13956361
#SPJ1
What is the change in energy of a gas at a pressure of 105 kPa, if 245 J of energy is added causing a change in volume from 25.3 L to 38.6 L?
Answers
Answer:
-1151.5 J
Explanation:
Given that:
The supplies energy = 245 L
The energy used in the expansion of gas = Pressure ×ΔV (change in volume)
At standard conditions;
Pressure = 105 × 10³ Pa
energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L
= 1396.5 J
Thus, the change in the energy of gas = 245 - 1396.5 J
= -1151.5 J
Hence, we can conclude that the gas has lost its own energy in the process of expansion.
The Soil conservation method in which mountain slope is cut into step is..
Answers
Answer:
Terracing.
Explanation:
Soil formation occurs as a result of the the decay or the remains of plants and animals which are used up.
Weathering can be defined as the physical and chemical breakdown of rock into smaller pieces called sediment. Weathering can be classified into two categories namely;
I. Physical weathering : it is the process of breaking rocks into pieces without affecting its chemical composition e.g temperature, abrasion and frost action.
II. Chemical weathering : it is the process of breaking rocks into pieces by chemical action which leads to changes in its chemical composition e.g carbonation, hydration, plant acid and oxidation.
Soil conservation can be defined as the use of various techniques so as to prevent the loss of the top most later of the soil and protecting it from degradation. Thus, the fertility of the soil is maintained.
The soil conservation method in which mountain slope is cut into step is terracing.
Answer:
Terracing
Explanation:
The Soil conservation method in which mountain slope is cut into step is Terracing.
Which product is made from nonmetallic mineral resources?
a. Stainless steel
b. iron nails
c. Copper wires
d. concrete
Answers
Answer:
Concrete
Explanation:
How does the energy in chemical bonds affect the energy in a chemical reaction?
Answers
Answer:
Is by comparing the energy absorbed when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. Chemical reactions that release energy are called exothermic
HNO3(s) → H+(aq) + NO3(aq)
Which statement about this equation is FALSE?
A. It shows the dissociation of nitric acid.
B. It is a decomposition reaction.
C. It forms anions and cations.
D. The resulting solution does not conduct electricity.
Answers
Answer:
D. The resulting solution does not conduct electricity.
Explanation:
Hello there!
In this case, for the given chemical reaction we can say that:
A. it is true because the nitric acid ionizes into hydrogen and nitrate ions
B. it is a decomposition reaction because the acid is partitioned into the composing ions.
C. it is ionized to hydrogen cations and nitrate anions.
D. this is incorrect because nitric acid is a strong electrolyte able to conduct the electricity.
Regards!
