Explanation:
Answer:
[tex]C_{36}[/tex][tex]H_{32}[/tex][tex]Cl_{4}[/tex][tex]N_{6}[/tex][tex]O_{4}[/tex]
How many grams of water are produced from 0.198 grams of nitric acid?
2HNO3+Mg(OH2) = Mg(NO3)2+2H2O
Answer:
2+2H2O.We already learn it
Which of the following equations is correctly balanced? UO2(s)+4HF(l)→UF4(s)+H2O(l) NCl3(g)+3H2O(l)→NH3(g)+HClO(aq) 4NH3(g)+3O2(g)→2N2(g)+3H2O(g) 4PH3(g)+8O2(g)→P4O10(s)+6H2O(g)
Answer:
4PH3(g)+8O2(g)→P4O10(s)+6H2O(g)
Which of the following IS NOT an ionic compound?
A) C2H5OH
B) KCI
C) Mg3N2
D) MnO2
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answer:
1. D) Sr
2. B) Cadmium
3. A)Ca2+
4. B) Small nonmetal atoms
5. C) Sb has a lower ionization energy and a lower electronegativity than I.
6. B) It tends to be more negative across a period.
7. B) The ionization energy increases because the ratio of the protons to electrons increases.
8. D) Ar
9. D) Cl
10. A) Energy needed to add an electron to a neutral atom in the gas phase.
Explanation:
I usually explain things but there are too many things to go over so let me know if u need a further explanation!
Two plastic containers are washed in a dishwasher. One keeps its shape and the other becomes deformed.
Identify and compare the property of the plastic containers demonstrated in this example.
Describe the structure of the polymers that affect this property.
Enter your answer in the space below
PLEASE HELP ASAP!!!
Answer:
Polymers are used in everything from nylon stockings to commercial aircraft to artificial heart valves, and they have a key role in addressing international competitiveness and other national issues.
Polymer Science and Engineering explores the universe of polymers, describing their properties and wide-ranging potential, and presents the state of the science, with a hard look at downward trends in research support. Leading experts offer findings, recommendations, and research directions. Lively vignettes provide snapshots of polymers in everyday applications.
The volume includes an overview of the use of polymers in such fields as medicine and biotechnology, information and communication, housing and construction, energy and transportation, national defense, and environmental protection. The committee looks at the various classes of polymers—plastics, fibers, composites, and other materials, as well as polymers used as membranes and coatings—and how their composition and specific methods of processing result in unparalleled usefulness.
To calculate acceleration you must know both the objects velocity and _______________ 1pt
Answer:
i think its speed
Explanation:
Answer:
Velocety and mass
Explanation:
If the arrows below indicate the path of a beam of light, which diagram shows an example of reflection?
Answer: bot sure
Explanation:
Describe the paper
chromatography in short.
Answer:
Paper chromatography, in analytical chemistry, technique for separating dissolved chemical substances by taking advantage of their different rates of migration across sheets of paper. It is an inexpensive but powerful analytical tool that requires very small quantities of material.
Explanation:
Hope it is helpful....
An element has an average atomic mass of 1.008 amu. It consists of two isotopes , one having a mass of 1.007 amu, and one having a mass of 2.014 amu. The isotope that is most abundant is:
Answer:
The most abundant isotope is 1.007 amu.
Explanation:
Given data:
Average atomic mass = 1.008 amu
Mass of first isotope = 1.007 amu
Mass of 2nd isotope = 2.014 amu
Most abundant isotope = ?
Solution:
First of all we will set the fraction for both isotopes
X for the isotopes having mass 2.014 amu
1-x for isotopes having mass 1.007 amu
The average atomic mass is 1.008 amu
we will use the following equation,
2.014x + 1.007 (1-x) = 1.008
2.014x + 1.007 - 1.007 x = 1.008
2.014x - 1.007x = 1.008 - 1.007
1.007 x = 0.001
x= 0.001/ 1.007
x= 0.0009
0.0009 × 100 = 0.09 %
0.09 % is abundance of isotope having mass 2.014 amu because we solve the fraction x.
now we will calculate the abundance of second isotope.
(1-x)
1-0.0009 = 0.9991
0.9991 × 100= 99.91%
Shape, color, texture, size, are examples of
A. Physical properties
B. Elements
C. Chemical properties
D. Matter
For a reaction, AH = 198 kJ. For which value of TA Sis the reaction spontaneous?
Answer:
ah+j
Explanation:
Which of following is 3942.25 rounded to 3 significant figures?
What are groups on the periodic table? How many are there?
Explanation:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups.
Iwhich
of the following is an ionic compound?
a. HCl(aq)
b. KClaa
C. C103(g)
d. NCl3
Answer:
KCl is an Ionic compound
Explanation:
Given the reaction below:
N2 (9)
+
(g) + N205 (9)
What is the oxidizing agent of the reaction?
The oxidizing agent of the reaction : O₂
Further explanationGiven
Reaction
N₂ + O₂ ⇒ N₂O₅
Required
The oxidizing agent
Solution
The balanced equation :
2N₂ + 5O₂ ⇒ 2N₂O₅
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
In the redoxs reaction, it is also known :
The reducing agents : a substance that experience oxidation
The oxidizing agent : a substance that is reduced
2N₂ → 2N₂O₅ (oxidation of N)
0 to +5
5O₂ → 2N₂O₅ (reduction of O)
0 to -2
So N₂ reducing agent, O₂ an oxidizing agent.
How many atoms are in a 158.69 g sample of nickel?
1.6283 × 10²⁴ atoms Ni
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Use Dimensional AnalysisExplanation:Step 1: Define
158.69 g Ni
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ni - 58.69 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 158.69 \ g \ Ni(\frac{1 \ mol \ Ni}{58.69 \ g \ Ni})(\frac{6.022 \cdot 10^{23} \ atoms \ Ni}{1 \ mol \ Ni})[/tex]Multiply/Divide: [tex]\displaystyle 1.62827 \cdot 10^{24} \ atoms \ Ni[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
1.62827 × 10²⁴ atoms Ni ≈ 1.6283 × 10²⁴ atoms Ni
In continuing to think about the rock cycle, we know the phases can take thousands, even millions of years to occur. Which stage in the cycle can happen in mere hours or days?
a. Lithification and Erosion
b. Heat and pressure
C. Compaction and weathering
d. Cooling & Crystallization
Answer:
d. Cooling & Crystallization
Explanation:
One of the stages of the rock cycle that can take place under mere hours or days is cooling and crystallization.
Cooling and crystallization of lava on the earth surface is a very rapid and fast process.
When magma from within the earth reaches the surface, it becomes lava. Due to the nature of the surface, it cools rapidly and very fast to form very fine grained igneous rocks.
1. Look up bromine on the periodic table. What is the most common isotope of bromine?
Answer:
The most common isotope is Bromine-79.
Explanation:
What is the density of an object that has a mass of 45g and a volume of 9mL?
ASAP!!
Answer:
312140 LB/CU FT
Explanation:
MULTIPLY
Which of these elements has the highest first ionization energy
A) oxygen
B) beryllium
C) fluorine
D) carbon
E) boron
Which graph above shows an object’s acceleration? 1pt
a or b
and why did you choose the graph
Answer:
A. because the graph is moving uo
Calculate the energy of light with a frequency of 5.21 x 104 Hz
Answer:
3.45*10^-29
Explanation:
E=hv
h is Planck's constant and v is the frequency (which was given to us)
E=6.626*10^-34 * 5.21*10^4
E=3.452146*10^-29
How does the theory of plate tectonics explain the movement of the continents and changes to Earth’s surface such as volcanic eruption, earthquakes and mountain building?
PLS HELP!! it’s science how do waves travel through gas
By 'waves' do you mean sound waves? If so sound waves need to travel through things like solids, liquids and yup gases. When the waves travel they are vibrating the molecules in the matter. By doing this he molecules in solids are packed very tightly.
If extinction is a normal part of ecosystems, and mass extinctions have happened before, why should humans be concerned about the rising extinction rate? What do current extinctions tell us about our impact on modern environments?
Answer:
we're terrible at keeping the earth clean and we know that lol
Explanation:
idrk
Humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
What is extinction?Extinction is the final phase of a sort of creature or a taxon—typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to have been the moment of extinction.
Determining this point is challenging because a species' dynamic value may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a duration of apparent absence. If extinction is a normal part of ecosystems, and mass extinctions have happened before, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
Therefore, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
To know more about extinction, here:
https://brainly.com/question/11872946
#SPJ7
what is one of the most common elements in living things.
What happens to the energy when you heat the iron? Why is this happening?
Answer:
When iron is heated in air it reacts with oxygen to form the compound iron oxide. Iron is a solid and oxygen is a gas. 5 Draw diagrams to show how the atoms are arranged in iron, oxygen and iron oxide in the circles below their names. Use different colours for the iron atoms and the oxygen atoms.
Explanation:
Why will a car exhaust pipe will rust much faster if the car is in
constant use.
Answer:
"The two main reasons are water and heat. Water vapour condenses in your exhaust when it cools. ... Water is also constantly splashed on it when driving in the rain or on wet roads. But the reason it rusts faster than other exposed parts is due to heat."
Explanation:
Brainliest?
A 2.8-kg pile of aluminum (rho = 2.70 g/cm3) cans is melted, then cooled into a solid cube. What is the volume of the cube?
Answer:
Explanation:
mass of aluminum 2.8 kg = 2.8 x 1000 = 2800 g
ρ = density of aluminum given = 2.7 g / cm³
density = mass / volume
volume = mass / density
= 2800 / 2.7
= 1037 cm³
So volume of cube required = 1037 cm³.
Tablets taken by patients suffering from anaemia contain 0.2g of iron sulfate (FeSO4). Calculate the relative formula mass of iron sulfate. Give your answer to the nearest whole number.
Answer:
152g
Explanation:
The compound given here is iron sulfate and it is represented as;
FeSO₄
The relative formula mass of the compound is determine by the addition of its component atomic masses and them expressed in grams
Atomic mass of Fe = 55.845
S = 32.065
O = 15.994
So;
Relative formula mass = 55.845 + 32.065 + 4(15.994) = 151.886g
Therefore, solution is 152g
Answer: 152
Explanation: