Answer:
I would say C
Explanation:
The pH of a solution is 8.43. What is the hydronium ion H30* concentration?
What are economic challenges that governments must face? check all that apply. threats of war unemployment low production inflation low voter turnout
The economic challenges that government must face are unemployment, low production, and inflation.
What are economic challenges?Economic challenges are problems related to the production of goods and services to satisfy unlimited wants.
Thus, the correct options are 2. Unemployment.
3. low production.
4. inflation.
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Answer:
B,C,D
Explanation:
took the test
Global warming is an ongoing issue for debate. True or False? Question 2 options: True False
Answer:
(True) The answer to that is yes, global warming is a hotly debated topic.
Explanation:
As a matter of political controversy, global warming is often viewed from different political perspectives. Which is why it is still an issue. (In 1988, global warming became a topic of discussion.) A number of climate change-related phenomena are occurring due to climate change, including rising temperatures, droughts and wildfires, changing precipitation patterns, glaciers melting, and rising sea levels.
Hope this helps! :D
How much heat energy is required to raise the temperature of 15g of silver from 25°C to 55°C, assuming the specific heat of silver
is 0. 24 J/gºC?
30
108
15 J
115 J
Answer:
108 j
Explanation:
.24 j/g-C * 15 g * (55-25) =
Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are produced when 27.5g of sodium are added to water?
Answer:
.598 moles of H2
Explanation:
Find the balanced equation of the reaction
2Na + 2 H2 0 ====> 2 Na OH + H2
27.5 gm of Na is 27.5/ 22.989 =1.196 moles
from the equation, each mole of Na produces 1/2 mole of H2
1.196 moles * 1/2 = .598 moles of H2
The reaction given by
2Na+2H_2O—»2NaOH+H_2Moles of sodium:-
Given mass/Molar mass27.5/231.196molSo
2mol Na Produces 1 mol H_21 mol Na Produces 0.5mol H_21.196 mol Na Produces=0.5(1.196)=0.598mol H_2Hello people ~
What are the most key factors of solid-state reactions?
a) Size of the particles
b) Mechanical properties of solids
c) Thermodynamic and kinetic factors
d) Environmental factors
Answer:
A and C
Explanation:
Size of the particles
It's denoted to surface area which is key factor of solid state reaction,higher the size late the reaction occursThermodyanmic and kinetic factors
the reaction depends upon temprature and rest factors like light , humidity etc
Answer:
Option AOption CExplanation:
What are Solid State Reactions ?
The reactions that are performed in the absence of solvents either by melting/grinding the materials together at the beginning of the reaction or by adding heat to the reaction are known as solid-state reactions Solid-state reactions are preferred because they reduce the generation of chemical wastes and costFactors
They depend on thermodynamic and kinetic factors, as mentioned before, heat is addedSize of the particles is also important because the rate of the reaction depends on the sizeNatural factors such as pressure, temperature, presence of sunlight, etc.In general, explain the difference between dietary fiber carbohydrates and sugar carbohydrates?
Answer:
Made up of glucose but passes through the body without being digested
Explanation:
Fiber: Made up of glucose but passes through the body without being digested. Sugar Alcohols: Not made up of glucose, therefore, they don’t directly affect blood glucose levels and are only partially digested. Although fiber is a carbohydrate, your body doesn’t digest it the same way.
Which tool is used to measure an object’s mass?
A. Graduated cylinder
B. Meter stick
C. Digital thermometer
D. Electronic balance
How much heat is required, in calories, to raise the temperature of 57. 8 g of silver from 17. 0degrees C to 43. 5 degrees C, if the specific heat of silver= 0. 057 cal/g degrees C
For a typical human height of 2 meter what is the horizon distance on earth (r=6378) (b mars R=3,340
For a typical human height of 2m, horizon distance on earth and mars is 5km & 3.7km respectively.
How do we calculate the distance?Horizontal distance will be calculated as:
D = √h² + 2hr, where
h = height of the human = 2m
r = radius
First we calculate distance on earth where radius of earth is 6378km or 6378000mD = √(2)² + 2(2)6378000
D = 2√6378001 = 5051m = 5km
Now we calculate distance on mars where radius of mars is 3340km or 3340000mD = √(2)² + 2(2)3340000
D = 2√3340001 = 3674m = 3.7km
Hence required horizon distance on earth and mars is 5km & 3.7km respectively.
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How many moles of oxygen are necessary to generate 28 moles of water, according to the following equation: 2H2+O2→2H2O
The number of moles of oxygen required to generate 28 moles of water from the reaction is 14 moles
Balanced equation2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 moles of water were obtained from 1 mole of oxygen
How to determine the mole of oxygen neededFrom the balanced equation above,
2 moles of water were obtained from 1 mole of oxygen
Therefore,
28 moles of water will be obtained from = 28 / 2 = 14 moles of oxygen
Thus, 14 moles of oxygen are needed for the reaction
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How do I solve this?
Answer:
All of the answers are examples of combustion reactions
Explanation:
Carbon, hydrogen and oxygen are the main elements you want to look for in combustion, I think.
To determine the limiting reactant in a chemical reaction, one must know the:.
Answer:
The available amounts of each reactant
Explanation:
The limiting reactant is the reactant that will limit the equation.
For example, I have 2N2 and H2O. In this situation, H2O would be the limiting reactant since there is only one atom, while N2 has two atoms.
Think of it like you're making peanut butter and jelly. You have 50 cans of peanut butter and only 10 jelly. Which means you can only make sandwiches using 10 jars of jelly and 10 jars of peanut butter.
What is a neutralization reaction?
Answer:
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions
Explanation:hope this helps<33
what the similarities are between solid, liquid and gas particles of water.
how to get the atomic mass of hydrogen
Answer:
the atomic mass is 1.00784 u
Explanation:
to calculate the atomic mass you add up the mass of protons and neutrons.
help this is for my cousin lol
Answer:
For camouflage, to blend in with their surroundings.
Explanation:
The solid, golden brown fur coat of the lion acts as camouflage and helps it hide to catch its prey, in low-lying grasses of the African savanna.
How many outer atoms and lone pairs are present in a molecule with a trigonal pyramidal shape?.
Answer:
3 outer atoms and 1 lone pair
what is diffusion ,??
Diffusion is the net movement of anything generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential.
A person’s
mass
will be the same on Jupiter and Earth. A person’s
height
will be greater on Jupiter than on Earth.
Giardiasis is an intestinal parasite that can transmitted through person-to-person contact and infested swimming pools. This parasite is best classified as
nosocomial.
inherited.
contagious.
iatrogenic.
asymptomatic.
Answer:
I think it would be Contagious.
Explanation:
You get it from another person or from food and thats contagious.
Balance the equation below:
NO2(g) + H2O(l) + O2(g) → 4HNO3(aq)
HELP PLEASE!
Explanation:
This is an oxidation-reduction (redox) reaction:
4 NIV - 4 e- → 4 NV (oxidation)
2 O0 + 4 e- → 2 O-II (reduction)
NO2 is a reducing agent, O2 is an oxidizing agent.
What is the name and formula for the most common natural ore for copper?.
Answer:
Clalcopyrite is the most important and major source of copper material. It is widely spread copper-iron sulfide minerals with chemical formula (CuFeS^2)
The most common natural ore of copper is chalcopyrite with the chemical formula CuFeS₂.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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The effective temperature of a star is related to its..
solar system.
luminosity.
absolute magnitude.
color.
Answer:
color
Explanation:
The effective temperature is directly related to the color of the star: the higher the temperature, the bluer the light emitted by the star.
A sample of crushed rock is found to have 4. 81 x 10^21 atoms of gold, how many moles of gold are present in this sample?
A. 7. 99 x 10^-3 moles
B. 1. 57 x 10^-1 moles
C. 1. 25 x 10^3 moles
D. 2. 47 x 10^5 moles
Answer:
A
Explanation:
Recall that a mole of any substance contains 6.02 × 10²³ amounts of that substance.
In other words, a mole of gold atoms contains 6.02 × 10²³ gold atoms.
Hence, by dimensional analysis, we have that:
[tex]\displaystyle 4.81\times 10^{21} \text{ Au} \cdot \frac{1\text{ mol Au}}{6.02\times 10^{23} \text{ Au}} = 7.99\times 10^{-3} \text{ mol Au}[/tex]
Therefore, there is about 7.99 × 10⁻³ moles of gold present in the sample.
In conclusion, the answer is A.
Outline the laboratory procedure for preparing a specific volume of a dilute solution from a concentrated stock solution
The various steps of how to prepare a specific volume of a dilute solution from a concentrated stock solution is described below.
Preparation of a dilute solution from stock solutionA stock solution is the solution that contains the standard concentration of a chemical compound.
A diluted solution is the solution shoes concentration has been decrease through addition of a solvent like water.
To prepare a dilute solution from a stock solution the following is done:
the needed volume of the stock solution is calculated,the volume is added to a volumetric flask,water is then added into the volumetric flask till it reaches the calibration line.Learn more about stock solutions here:
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Are things on fire or is fire on things?
Answer:
It will depend on the situation to call it either way
Explanation:
Help please!
An Arrhenius acid increases the concentration of hydrogen ions when dissolved in solution.
True
False
Answer:
The answer is true
Explanation:
An Arrhenius acid is a substance that increases the concentration of hydrogen ions in solution when it is dissolved in water.
Answer:
false
Explanation:
Water can act as both an acid and a base in an ionization reaction to form H') and OH ions.
What is this phenomenon called?
O self-ionization
O neutralization
O acid dissociation
O base dissociation
Answer:
neutralization
Explanation:
Water is a very interesting compound.It has tendency to both donate and accept a pair of electronsWhen it accepts it forms H_3O+ to be lewis acid.When it donates it forms OH- to be Lewis baseSuppose all the NO2 molecules were synthesized into N2O4. Given the equation 2NO2 ⇄ N2O4, how many moles of N2O4 would be produced? 2. 34 moles of N2O4
The moles of N₂O₄ would be produced by given moles of NO₂ is 1 mole.
What is stoichiometry?Stoichiometry of any reaction gives idea about the amount of species present before and after the completion of reaction.
Given chemical reaction is:
2NO₂ ⇄ N₂O₄
From the stoichiometry of the reaction it is clear that, 2 moles of nitrogen dioxide will produces 1 mole of N₂O₄.
Hence the produced moles of N₂O₄ is 1 mole.
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