Answer:
The chemicals which are electrolytes include: Sodium chloride, chloric acid, nitric acid, potassium nitrate, hydrochloric acid, potassium nitrate, sulfuric acid, sodium hydroxide, magnesium hydroxide and sodium acetate.
Answer:
Sulfuric acid and potassium hydroxide.
Explanation:
These are the two compounds used in car batteries, hope this helps!
To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.(show how you arrived at your response)
Answer:
90 Minutes
Explanation:
Original concentration = 120 mg
Half life = 30 minutes
Minimum level = 15 mg
Basically, we are to calculate the time it would take to drop from 120 mg to 15 mg.
The half life of a substance is the time it takes for the original concentration of a substance to drop to half it's starting concentration.
First Half life:
Starting concentration = 120mg
Concentration after half life = 120 / 2 = 60 mg
Second Half life;
Starting concentration = 60 mg
Concentration after half life = 60 / 2 = 30 mg
Third Half life;
Starting concentration = 30 mg
Concentration after half life = 30 / 2 = 15 mg
We have reached the minimum 15 mg level. This means it took three half lives to get there.
Total time taken = No of Half lives * Half life duration = 3 * 30 mins = 90 Minutes
Build Carbon (6 red protons, 6 grey neutrons, 6 blue electrons) How many
neutrons could an isotope of carbon have?
A. 5
B. 6
C. 7
Answer:
B. 6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
a sample of methane gas at a pressure of 0.727 atm and a temperature of 26.9 occupies a volume of 726 ml. if the gas is allowed to expand at constant temperature until its pressure is 0.412 atm, the volume of the gas sample will be _ mL
Answer:
1280L
Explanation:
Given parameters:
Initial pressure = 0.727atm
Temperature = 26.9°C
Initial volume = 726mL = 0.726L
New pressure = 0.412atm
Unknown:
New volume of the gas sample = ?
Solution:
To solve this problem, we apply boyles law;
P1V1 = P2V2
P and V are pressure and temperature
1 and 2 are initial and new state
0.727 x 0.726 = 0.412 x V2
V2 = 1.28mL = 1280L
A 1.0 kg ball is thrown into the air and initial velocity of 30 mi./s how high into the air did the ball travel
Answer:
45.9m
Explanation:
Given parameters:
Mass of the ball = 1kg
Initial velocity = 30m/s
Unknown:
Height the ball will travel = ?
Solution:
At the maximum height, the final velocity of the ball will be 0;
Using ;
V² = U² - 2gh
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
h is the height
0² = 30² - (2 x 9.8 x h)
0 = 900 - 19.6h
h = 45.9m
Radiation can travel through A. liquids B. gases C. empty space D. all of these
Answer:
Liquids
Explanation:because animals like dolphins use sound radiation under water to hear each other
Answer:
D. all of these.
Explanation:
it can travel through solids, liquids, and gasses.
whats the unit for mass
Answer:
The unit for mass is the kilogram (Kg).
Explanation:
Hope this helped!! <3 good luckk!!
The temperature of the system is highest when it is a
A. gas
B. liquid
C. plasma
D. solid
Answer:
gas
Explanation:
its either gas or plasma but gas should be it bc liquid and solid are cold
3. If 12.5 grams of copper are reacted with excess chlorine gas, then 25.4 grams of
copper (II) chloride are produced. Calculate the theoretical yield and the percent
yield. Cu + Cl2 → CuCl2
Answer:
Percent yield = 99.6%
Theoretical yield = 25.5 g
Explanation:
Given data:
Mass of copper = 12.5 g
Mass of copper(II) chloride produced = 25.4 g
Theoretical yield = ?
Percent yield = ?
Solution:
Chemical equation:
Cu + Cl₂ → CuCl₂
Number of moles of copper:
Number of moles = mass/molar mass
Number of moles = 12.5 g / 63.5 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of copper and copper chloride.
Cu : CuCl₂
1 : 1
0.19 : 0.19
Mass of CuCl₂: Theoretical yield
Mass = number of moles × molar mass
Mass = 0.19 mol × 134.45 g/mol
Mass = 25.5 g
Percent yield:
Percent yield = (actual yield / theoretical yield )×100
Percent yield = ( 25.4 g/ 25.5 g) ×100
Percent yield = 99.6%
Enter a complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate. Express your answer as a complete ionic equation. Identify all of the phases in your answer.
Answer: [tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]Hg_2(NO_3)_2(aq)+2NaCl(aq)\rightarrow Hg_2Cl_2(s)+2NaNO_3(aq)[/tex]
The complete ionic equation will be :
[tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
what is one example of a electromagnetic wave
Answer:
Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Answer:
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Explanation:
If the object floats in water, is its density lower or higher?
Answer:
Its has a lower density. Think about it, a ship in the water is long because if it wasn't it would have a higher density and sink. The ship needs to diperse its weight across the water to make it less dense.
Explanation:
Your welcome! Have a great day!
How many moles and atoms are there in 60 grams of Calcium?
Answer:
The moles present in 60 g of calcium are 1.5 moles.
Answer:
In 60 grams there are 1,5 mols
Explanation:
ILL GIVE YOU BRAIN LIEST IF YOU KNOW THE ANSWERS
Answer:B & C
tell me if im wrong
Answer:
Q 3 c it will reduce rate of photosynthesis in plants that live in the bottom of the lake
Q4 d the atom are in same group
This is right answer because these two elements are Lithium and neon Lithium is present in first group and Neon in last or group 18
Explanation:
A student performed an investigation to determine if the rate of photosynthesis in elodea is affected by a higher than normal concentration of carbon dioxide gas in the water in which the plant is growing. After increasing the concentration of carbon dioxide in water, the student illuminated the plant with a light and collected the bubbles of oxygen gas that were given off from the cut end of the submerged plant. In this investigation, what would be the best indicator of the rate of photosynthesis? a a change in the color of the plant b an increase in the length of the elodea plant over a period of 12 hours c the amount of light that is transmitted through the water d the amount of oxygen collected over a period of 12 hours
Answer:
D. the amount of oxygen collected over a period of 12 hours
Explanation:
Photosynthesis is a metabolic reaction performed by the cells of plant. In this reaction, light is used as an energy source to combine carbon dioxide (CO2) and water (H2O) to produce glucose and oxygen gas (O2) as products. In every chemical reaction including photosynthesis, an increase in concentration of reactants will increase the rate of the reaction, which is evident in the amount of products formed.
According to this question where a student is performing an investigation to determine the relationship between a higher than normal concentration of carbon dioxide gas and the rate of photosynthesis. After increasing the concentration of carbon dioxide in water, the student illuminated the plant with a light and collected the bubbles of oxygen gas that were given off from the cut end of the submerged plant.
Based on the above explanation, the best indicator of the rate of photosynthesis in this investigation will be THE AMOUNT OF OXYGEN COLLECTED OVER A PERIOD OF 12 HOURS.
WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS FASTEST AND CORRECT BUT ANY ANSWERS TO JUST GET POINTS WILL GET REPORTED AND DELETED
Which is an example of condensation? *
5 points
A) water boiling in a pot
B) water being absorbed by plants
C) salt being removed from water
D) moisture on a mirror after a hot shower
Answer:
a
Explanation:
Answer:
D
Explanation:
A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a____. it for science class
The following diagram shows the bonds that make up potassium acetate.
Answer:
6
Explanation:
ye
Which of the following correctly shows the relationship, in terms of number of particles, of the three substances?
A. 1 mole of water < 1 mole of helium < 1 mole of aluminum
B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
C. 1 mole of aluminum < 1 mole of helium < 1 mole of water
D. 1 mole of helium < 1 mole of aluminum < 1 mole of water
The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.
What is a particle?
A particle is a small part of matter.
The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.
The relationship of a number of particles of the substance can be calculated by Avogadro's law
Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
Learn more about particles
https://brainly.com/question/1685421
what is the mass in grams of a sample of 7.3 x 10^23 molecules of (iodine heptafluoride) IF7
320 g IF₇
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 TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.3 × 10²³ molecules IF₇
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of I - 126.90 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 7.3 \cdot 10^{23} \ molecules \ IF_7(\frac{1 \ mol \ IF_7}{6.022 \cdot 10^{23} \ molecules \ IF_7})(\frac{259.9 \ g \ IF_7}{1 \ mol \ IF_7})[/tex]Multiply/Divide: [tex]\displaystyle 315.056 \ g \ IF_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
315.056 g IF₇ ≈ 320 g IF₇
Please help outttt:(
Explanation:
1)
2Fe+3Cl2 →2FeCl3
2)
CH4+2O2 → CO2 +2H2O
3)
SnO2+2H2 →2H2O +Sn
4)
2KOH + H2SO4 → K2SO4+2H2O
help me please just w number 2&3
Answer:
2.No. because in an open system, gas will blow up & so, if it's measured, it won't have the equal amount of the reactant. But, if you arrange this reaction in a closed system, then it will be the same.
3.2SiO2+4Cl2= 2SiCl4+O2
Explanation:
The element fluorine has an atomic number of
a. 10
b. 9
c. 19
d. 28
Answer:
B.9
Explanation:
Are the activities exothermic or endothermic?
Answer:
The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.
And last no reaction shows that heat is required so last reaction is endothermic reaction.
Explanation:
And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction
How many moles are in 8.63 x 103 atoms of Li?
1.43 × 10⁻²⁰ mol Li
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
8.63 × 10³ atoms Li
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})[/tex]Multiply/Divide: [tex]\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li
What do the red arrows represent
Answer:
There are three forces acting on the skateboard. One of these forces is the weight of the rider. Another is the force of gravity on the board itself. The third is the force of the ground pushing up on the skateboard.
Cynthia has 200kg of magnesium. Calculate how much MgCl2 she can make.
Mg + Cl2 = MgCl2
Answer:
784.4kg
Explanation:
Given parameters:
Mass of Mg = 200kg
Unknown:
Mass of MgCl₂ = ?
Solution:
The reaction equation is given as:
Mg + Cl₂ → MgCl₂
Find the number of moles of the given specie;
Number of moles of Mg = [tex]\frac{mass}{molar mass}[/tex] = [tex]\frac{200000}{24.3}[/tex] = 8230.5mole
So;
1 mole of Mg will produce 1 mole of MgCl₂
8230.5mole of Mg will produce 8230.5mole of MgCl₂
Mass of MgCl₂ = number of moles x molar mass
Molar mass of MgCl₂ = 24.3 + 2(35.5) = 95.3g/mol
Mass of MgCl₂ = 8230.5mole x 95.3g/mol = 784.4kg
What is the frequency of light with a wavelength of 3.2 x 10^-16 m?
Answer:
f = 0.94 ×10²⁴ Hz
Explanation:
Given data:
Frequency of light = ?
Wavelength of light = 3.2 ×10⁻¹⁶ m
Solution:
Formula:
Speed of light = wavelength × frequency
c = λ × f
c = speed of wave = 3×10⁸ m/s
by putting values,
3×10⁸ m/s = f × 3.2 ×10⁻¹⁶ m
f = 3×10⁸ m/s / 3.2 ×10⁻¹⁶ m
f = 0.94 ×10²⁴ s⁻¹
f = 0.94 ×10²⁴ Hz (Hz = s⁻¹)
Consider the following reaction:
10 KCIO3 + 3 P4 → 3 P4010 + 10 KCI
Given 30 moles of P4 and 86 moles of KCIO3, which would act as the limiting reactant?
Answer: [tex]KClO_3[/tex] is the limiting reactant in the given reaction.
Explanation:
Limiting reagent is defined as the chemical specie which gets totally consumed in the reaction and the formation of product is dependent on this reagent.
We are given:
Moles of [tex]P_4[/tex] = 30 moles
Moles of [tex]KClO_3[/tex] = 86 moles
The given chemical equation follows:
[tex]10KCIO_3+3P_4\rightarrow 3P_4O_{10}+10KCI[/tex]
By Stoichiometry of the reaction:
If 10 moles of [tex]KClO_3[/tex] reacts with 3 moles of [tex]P_4[/tex]
Then, 86 moles of [tex]KClO_3[/tex] will react with = [tex]\frac{3}{10}\times 86=25.8moles[/tex] of [tex]P_4[/tex]
As, given amount of [tex]P_4[/tex] is more than the required amount. So, it is considered as an excess reagent.
Therefore, [tex]KClO_3[/tex] is considered as a limiting reactant because it limits the formation of product.
Making Sense
1. School bus drivers are extra careful when they cross railroad tracks. They stop before they cross railroad tracks to be sure that there is no
train coming. Yet, trains typically move more slowly through towns than cars do. If trains usually move more slowly than cars, why can
they do more damage if they hit something in their path?
=
2
11
B
1
GO
III
un
III
X2
Saved January 15, 2021 07:35:00 PM
Answer: I think that trains move faster then cars! Buttt, The trains are much stronger and bigger, then cars or trucks. Even if they move slowly they can still crush something smaller then them.
Explanation: ( didnt really understand the question, but i tried)
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.