Answer:
man my brain like that to
Explanation:
Answer:
man my brain like that to
Explanation:
Which equation could be used to solve for the average speed of a car that travels 90m in 20 seconds?
Answer:
Vav=d/t
Explanation:
Because the question already gave d=90m and t=20s. Because the car is the thing that can not travel the same distances at the same times.So the equation is V[tex]\\_{av}[/tex]=[tex]\frac{d}{t} \\[/tex]
How do you know a substance has dissolved?
it might look like it has disappeared, but in fact it has just mixed with the water to make a transparent
Consider this reaction: 2HgO→2Hg+O2 .
Which of the following is the best explanation for why this reaction is a decomposition reaction?
Question 5 options:
Because it is balanced
Because oxygen is one of the reactants
Because there are two products
Because there is only one reactant
Answer:
becous thear are two products
Explanation:
The statement is "Because there is only on reactant."
What is reactant?Reactant are raw materials that react with one another and form products.
What is decomposition reaction?
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks into two or more product.
Hence the correct explanation about the reaction is "because there is only one reactant"
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What type of chemical reaction is taking place?
A. Synthesis
B. decomposition
C. single replacement
D. double replacement
double replacement
Explanation:
it's double replacement
What is the name for C2I3
Answer: The correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide.
Explanation:
[tex]C_2I_3[/tex] is a covalent compound because in this compound the sharing of electrons takes place between carbon and iodine.. Both the elements are non-metals. Hence, it will form covalent bond.
The naming of covalent compound is given by:
The less electronegative element is written first.
The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.
If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.
Hence, the correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide..
11. Everybody loves Mr Brown
Answer:
NO I DON'T ✌✌✌✌✌✌✌✌✌
How many atoms are in .938 moles of CO2?
Answer: 1.695x10^24 atoms
Explanation: 0.938 moles CO2 = 0.938xavogadro number molecules CO2, so number of atoms = 3x0.938x6.02214076x10^23 = 1.695x10^24
if Fe(NO3)3 is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion g
The given question is incomplete. the complete question is : If 5.15 g[tex]Fe(NO_3)_3[/tex] is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion.
Answer: The molar concentartion of nitrate ion is 0.195.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
Given : 5.15 g of [tex]Fe(NO_3)_3[/tex] is dissolved
Volume of solution = 323 ml
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n= moles of solute
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{5.15g}{242g/mol}=0.021moles[/tex]
[tex]V_s[/tex] = volume of solution = 323 ml
[tex]Molarity=\frac{0.021\times 1000}{323}=0.065M[/tex]
As 1 M of [tex]Fe(NO_3)_3[/tex] gives 3 M of [tex]NO_3^-[/tex] ions.
Thus 0.065 M of [tex]Fe(NO_3)_3[/tex] gives = [tex]\frac{3}{1}\times 0.065=0.195M[/tex] of [tex]NO_3^-[/tex] ions.
The molar concentartion of nitrate ion is 0.195.
Identify the ionic compound that can form between potassium as the metal and nitrogen as the nonmetal.
help!!
Answer:
[tex]6K _{(s)} + N _{2(g)} = = > \:2K _{3} N _{(s)} [/tex]
Potassium nitride
Find the volume, in Liters, of 2.5 x 1024 molecules of chlorine gas at STP.
Answer:
V = 93.0 L
Explanation:
Hello!
In this case, when computing the PVT properties for an ideal gas, we need to use the following equation:
[tex]PV=nRT[/tex]
In such a way, for 2.5 x 10²⁴ molecules of chlorine at STP (273.15 K and 1.00 atm) we first need the moles based on the Avogadro's number:
[tex]n = 2.5x10^{24}molec*\frac{1mol}{6.022x10^{23}molec} = 4.15mol[/tex]
Now, we solve for volume on the ideal gas equation to obtain:
[tex]V=\frac{nRT}{P}[/tex]
So we plug in and get:
[tex]V=\frac{4.15mol**0.08206\frac{atm*L}{mol*K}*273.15K}{1.00atm}\\\\V=93.0L[/tex]
Best regards!
Water in the atmosphere is a gas. When the air cools, water may condense into clouds. Then it may become a liquid or a solid and fall back to the surface of the Earth.
Water that falls from clouds is called
A.
precipitation.
B.
evaporation.
C.
groundwater.
D.
the water cycle.
Answer:
A precipitation is answer
curicun, named for marie curie, has approximately 25 different isotopes that emit an alpha particle when their nuclei decay. if curium-247, the most abundant nuclide, emit and alpha particle, what daughter nuclide is formed?
A. Californium-251
B. Plutonium-243
C. Californium-249
D. Plutonium-251
Answer:
Option B. Plutonium-243
Explanation:
To know the the correct answer to the question, we shall write the balanced equation for the reaction showing curium-247 (²⁴⁷Cm) emitting alpha particle. This is illustrated below:
²⁴⁷₉₆Cm —> ᵐₙX + ⁴₂He
Next, we shall determine m, n and X. This can be obtained as follow:
247 = m + 4
Collect like terms
247 – 4 = m
243 = m
Thus, m is 243
96 = n + 2
Collect like terms
96 – 2 = n
94 = n
Thus, n is 94
m = 243
n = 94
ᵐₙX => ²⁴³₉₄X => ²⁴³₉₄Pu
Thus, the equation is:
²⁴⁷₉₆Cm —> ²⁴³₉₄Pu + ⁴₂He
From the illustrations above, the daughter nuclei formed is Plutonium-243 (²⁴³₉₄Pu)
Answer:
Plutonium-243
Explanation:
Which one of these is NOT one of the characteristics of living things?
A.All living things reproduce.
B.All living things are composed of one or more cells.
C.All living things grow develop and have life spans.
D.All living things provides heat and light on Earth.
Answer:
D. All living things provides heat and light on Earth.
Explanation:
its the sun that does that
Answer:
option d.
Explanation:
all living things provides heat and light on Earth.
Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?
a It transfers thermal energy to deeper layers of the ocean.
b It becomes less dense and rises to the surface.
c It transfers thermal energy to the area, warming the equatorial waters.
d It becomes more dense and sinks to the ocean bottom.
Answer:
c
Explanation:
The ocean water transfers thermal energy to the area, warming the equatorial waters. Therefore, the correct option is option C.
What is thermal energy?In physics and engineering, the phrase "thermal energy" is thrown around in a lot of different situations. It can relate to a variety of distinct physical notions. They include radiation and a body of matter's inherent energy, also known as enthalpy.
Through means besides just thermodynamic work or the movement of matter, including such conduction, radiation, or friction, heat is energy that is moved into or out of a thermodynamic system. Heat is not a property of any single system or something that is "contained" within it; rather, it is a quantity that is transmitted across systems. Internal energy and enthalpy, on the other hand, are characteristics of a single system. The ocean water transfers thermal energy to the area, warming the equatorial waters.
Therefore, the correct option is option C.
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Match the word with the definition. Write the correct letter in the space
provided. Reminder
that your answers should be blue.
A. Proton
B. Periodic Table
C. Atom
D. Chemical Symbol
E. Group
F. Atomic Number
G. Atomic Mass
H. Period
1. Electron
J. Neutron
K. Nucleus
1. Average mass of all the isotopes of that element
2. Series of elements arranged in rows on the periodic table
3 Smallest particle that still can be considered an element
4. Subatomic particle with no charge
5. An abbreviation of an element's name, usually one or two letters
6. Subatomic particles with a positive charge
7.
A small region in the center of an atom
8.
Arrangement of elements showing repeating pattern of their
properties
9. Series of elements arranged in columns on the periodic table
10.
Subatomic particles with a negative charge
11.
Number of protons in the nucleus of an atom
Answer:
this may be wrong and if it is im sorry
A=6
B=8
C=3
D=5
E=9
F=11
G=1
H=2
I=10
J=4
K=7
if an atom with a mass number of 27 has 14 neutrons,it is an isotope of which element
Answer:
the number of neutrons in above isotope = A - Z = 27 - 13 = 14. Note: The molar mass of aluminium, which is average of atomic masses of all isotopes = 26.981538 g/mol, since 13Al27 is the major isotope.
Explanation:
Answer:
Aluminum
Explanation
mass number = number of protons + number of neutrons
Number of protons = mass number - number of neutrons
No of protons = 27-14 = 13
Aluminum contains 13 protons
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and
copper. Which of the following could NOT be a mole ratio in this chemical
reaction?
A)1 mole Fe / 2 mole Cu
B)1 mole Fe(NO3)2 / 2 mole Cu
C)2 mole Cu(NO3)2 / 2 mole Fe
D)1 mole Fe(NO3)2 / 1 mole Fe
Answer:
C)2 mole Cu(NO3)2 / 2 mole Fe
Explanation:
I'm pretty sure.
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and copper. The following could NOT be a mole ratio in this chemical reaction is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
To determine which of the given mole ratios could NOT be part of the chemical reaction between iron and copper(1) nitrate, we need to write the balanced chemical equation for the reaction and then compare it to the given ratios.
The balanced chemical equation for the reaction is:
Fe + Cu(NO₃)₂ → Fe(NO₃)₂ + Cu
A) 1 mole Fe / 2 mole Cu
This mole ratio is consistent with the balanced chemical equation, where 1 mole of Fe reacts with 2 moles of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. So, this ratio could be part of the chemical reaction.
B) 1 mole Fe(NO₃)₂ / 2 mole Cu
This mole ratio is also consistent with the balanced chemical equation, where 1 mole of Fe(NO₃)₂ is produced by reacting 2 moles of Cu(NO₃)₂. So, this ratio could be part of the chemical reaction.
C) 2 mole Cu(NO₃)₂ / 2 mole Fe
This mole ratio is consistent with the balanced chemical equation, where 2 moles of Cu(NO₃)₂ react to produce 2 moles of Fe(NO₃)₂. So, this ratio could be part of the chemical reaction.
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
This mole ratio implies that 1 mole of Fe(NO₃)₂ is produced by reacting with 1 mole of Fe, which is not consistent with the balanced chemical equation. The equation shows that 1 mole of Fe reacts with 1 mole of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. Therefore, this ratio could NOT be part of the chemical reaction.
So, the correct answer is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
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g Determine the oxidation state for each of the elements below. ... The oxidation state of ... phosphorus ... in ... phosphorous tribromide PBr3 ... is ... . The oxidation state of nitrogen in nitrogen gas N2 is . The oxidation state of arsenic in arsenic acid H3AsO4 is .
Answer:
- P in PBr3 is +3.
- N in N2 is 0.
- As in H3AsO4 is +5.
Explanation:
Hello!
In this case, since the determination of the oxidation states is performed by using the well-known charge balances, we can proceed as shown below:
- P in PBr3: Here, bromide ions have an oxidation state of -1, so we follow:
[tex]P^xBr_3^-\\\\x-3=0\\\\x=+3[/tex]
Thus, the oxidation state is +3.
- N in N2: Here, since nitrogen is bonding with nitrogen and it is neutral, we infer its oxidation state is 0.
- As in H3AsO4: Here, oxygen is -2 and hydrogen +1, so we follow:
[tex]H_3^+As^xO_4^{-2}\\\\3+x-8=0\\\\x=8-3\\\\x=5[/tex]
Thus, the oxidation state is +5.
Best regards!
A student is trying to determine the density of a piece of metal. She uses a balance and finds that the mass of the piece of metal is 15.36 g. To determine the volume of the metal she fills a graduated cylinder to 30.0 mL and then drops the piece of metal into the graduated cylinder. The final volume of the metal 34.1 mL. What is the density of the piece of metal
Answer:
3.746 g/mL
Explanation:
Mass of metal = 15.36 g
Initial Volume = 30.0 mL
Final Volume = 34.1 mL
Volume of metal = Final Volume - Initial Volume = 34.1 mL - 30.0 mL
Volume of metal = 4.1 mL
Density = ?
The relationship between the values is given as;
Density = Mass of metal / Volume of metal
Inserting the values;
Density = 15.36 / 4.1 = 3.746 g/mL
The density of the piece of metal is 3.746 g/ml.
How to find the density of any metal?Given the mass of metal is 15.36 g
The initial volume of a cylinder is 30.0 ml
The final volume after putting metal in it is 34.1ml
Step 1- To find the volume:
The volume of metal = Final Volume – Initial Volume 30.0 mL
Volume of metal = 34.1 – 30.0 = 4.1 ml
Volume of metal = 4.1 mL
Step 2- Find the Density:
Density = Mass of metal is divided by the Volume of metal
[tex]\bold{Density = \dfrac{15.36 }{4.1} =3.746 g/ml}[/tex]
Thus, the density is 3.746 g/ml.
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A sample of hydrate sodium carbonate has a mass of 71.5 g. after heating, the anhydrous sodium carbonate has a mass of 26.5 grams. Calculate the % water.
Answer:
62.9%
Explanation:
Step 1: Given data
Mass of hydrate sodium carbonate (mNa₂CO₃.xH₂O): 71.5 gMass of anhydrous sodium carbonate (mNa₂CO₃): 26.5 gStep 2: Calculate the mass lost of water
We will use the following expression.
mH₂O = mNa₂CO₃.xH₂O - mNa₂CO₃
mH₂O = 71.5 g - 26.5 g = 45.0 g
Step 3: Calculate the percent of water in the hydrate sodium carbonate
We will use the following expression.
%H₂O = mH₂O / mNa₂CO₃.xH₂O × 100%
%H₂O = 45.0 g / 71.5 g × 100%
%H₂O = 62.9%
What are the rows of the periodic table called?
Answer:
"The elements are arranged in seven horizontal rows,called periods or series,and 18 vertical columns,called Groups."
Explanation:
Risk*
Which chemical equation is balanced?
a. 2LiOH + CO2 → Li2CO3 + H2O
b. LiOH + CO2 → Li2CO3 + H2O
c. LiOH + 3CO2 → 2Li2CO3 + H2O
d. 4LiOH + CO2 → Li2CO3 + 2H20
The balance chemical equation is 2LiOH + CO2 → Li2CO3 + H2O. Therefore, option A is correct.
What is balance chemical equation ?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal. As a result, during the chemical process, the number of atoms in each element remains constant. The chemical equation must be balanced as a result.
The chemical equation is said to be balanced if there are no inequalities. Every element in this illustration now has the same amount of atoms on the reactant and product sides.
Thus, option A is correct.
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Use the following reaction:
6 NaCl + Ba3(PO4)2 → 2 Na3PO4 + 3 BaCl2
How much barium chloride is produced (in g) when 1500 g of sodium chloride react with excess barium phosphate?
Round your answer to a whole number, do not write the units.
Mass of Barium chloride produced : 2666.56 g
Further explanationGiven
Reaction
6 NaCl + Ba3(PO4)2 → 2 Na3PO4 + 3 BaCl2
1500 g of sodium chloride
Required
Barium chloride produced
Solution
mol NaCl (MW= 58.5 g/mol) :
mol = mass : MW
mol = 1500 g : 58.5 g/mol
mol = 25.64
mol Barium chloride-BaCl2 based on mol NaCl(as a limiting reactant)
From the equation, mol ratio NaCl : BaCl2 = 6 : 3, so mol BaCl2 :
[tex]\tt \dfrac{3}{6}\times 25.64=12.82[/tex]
mass BaCl2(MW=208 g/mol) :
mass = mol x MW
mass = 12.82 x 208
mass = 2666.56 g
What element corresponds to period 5, group 2
Answer:
Strontium is the second element placed in the 5th period
Hope this will help you if not so advance sorry :)
Johnson, Taniya
A student travels on a trail by bicycle 20 miles in 2 hours. What is the average speed of the student?
Answer:
i think its 10 miles per hour
What is the direct democracy? Does it work well with a large or small population
Answer:
In a direct democracy, which is also called pure democracy the decisions are not taken by representatives. All decisions are voted on by the people. When a budget or law needs to be passed, then the idea goes to the people. Large governments rarely make decisions this way
Explanation:
I don't think direct democracy works well unless the population is homogenous and agree on major issues
8. As the temperature of a mixture increases, one part of the mixture may 2 points
melt while the other parts remain solid. *
True
Or
False
Answer:
It's false
Explanation:
Mixtures are always combinations of the same compounds that are at different states.
at the molecular level what form of energy do the molecules have?
Answer:
kinetic energy I think so
The form of energy molecules have at the molecular level is Kinetic energy.
Kinetic energy is defined as the energy possessed by a body as a result of its motion or movement.
Molecules interact with one another through various movements that occur
within them. This happens to aid the formation of new substances in the
ecosystem. The three states of matter exhibit varying degree of movement
within its molecules.
The energy is usually in the form of chemical energy also and is the reason
why kinetic energy is the most suitable choice.
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MULTIPLE CHOICE QUESTION
If
you are warming yourself near the
campfire, you are experiencing heat
transfer from the fire, through:
Convection
Conduction
Radiation
Answer:
radiation
Explanation:
What is public participation? Why is it
necessary for environmental conservation
Answer:
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