Answer:
Mass number
Explanation:
How many grams of potassium chloride is produced with 2.5g of pure potassium
(K) react with chlorine gas? How many grams if you started with 1g of chlorine
gas?
Answer:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Explanation:
big brain ;)
What is the number of moles of atoms in 9.03 x 10 24 atoms?
Answer:
15
Explanation:
How much heat is produced by the combustion of 125 g of acetylene (C2H2)?
C2H2(g) +
202(8)
2C02(8) + H2O(1)
AH = -1301.1 kJ/mol
The amount of heat produced when 125 g of acetylene C₂H₂ combust in air is –6255.3 KJ
Balanced equationC₂H₂ + 5/2O₂ —> 2CO₂ + H₂O ΔH = –1301.1 KJ/mol
From the balanced equation above,
1 mole of C₂H₂ releases –1301.1 KJ of heat energy
But
1 mole of C₂H₂ = (2×12) + (1×2) = 26 g
Thus,
26 g of C₂H₂ releases –1301.1 KJ of heat energy
How to determine the heat released by 125 g of C₂H₂From the balanced equation above,
26 g of C₂H₂ releases –1301.1 KJ of heat energy
Therefore,
125 g of C₂H₂ will release = (125 × –1301.1) / 26 = –6255.3 KJ of heat energy
Thus, –6255.3 KJ of heat energy were produced from the reaction.
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Select the correct answer. A solution with 117 grams of lithium hydroxide and another with 141 grams of hydrogen bromide are combined. They react according to this equation: LiOH HBr → LiBr H2O. What is the theoretical yield of lithium bromide? Use the periodic table and polyatomic ion resource. A. 117 g B. 141 g C. 151 g D. 258 g E. 424 g.
The periodic table is the arrangement of the elements based on their atomic numbers. The theoretical yield of lithium bromide will be 151 gm.
What is a theoretical yield?A theoretical yield is the estimation of the number of moles of product formed in relation to the reactants consumed in a reaction.
The balanced chemical reaction can be shown as:
[tex]\rm LiOH + HBr \rightarrow LiBr + H_{2}O[/tex]
From the reaction, it can be seen that the moles of all the compounds and molecules are 1.
The molar mass of lithium hydroxide is calculated as:
6.94 + 15.999 + 1.008 = 23.947 gram per mol
The molar mass of hydrogen bromide is calculated as:
1.008 + 79.904 = 80.912 gram per mol
The moles of lithium hydroxide is calculated as:
[tex]117\;\rm g (\dfrac{1\;\rm mol}{23.947}) = 4.89\;\rm mol[/tex]
The moles of hydrogen bromide is calculated as:
[tex]141\;\rm g (\dfrac{1\;\rm mol}{80.91}) = 1.74\;\rm mol[/tex]
From this, it can be said that hydrogen bromide is a limiting reagent as it has fewer moles than LiOH.
The molar mass of lithium bromide is given as, 6.94 + 79.904 = 86.844 grams per mol
Mass of lithium bromide formed will be:
[tex]\rm 1.74\;\rm mol (\dfrac{86.84}{1\;\rm mol}) = 151\;\rm gm[/tex]
Therefore, the theoretical yield of lithium bromide is option C. 151 gm.
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What is a single celled organism able to do?
differentiate
grow to large sizes
make tissues
survive on its own
Answer:
he or she is right
make tissues is the answer
Explanation:
hope this helps :)
help! How can one calculate the wavelength of light?
A. λ = f/c
B. λ = c/f
C. λ = 1/fc
D. λ = cf
Answer:
the answer is B. wavelength= wavespeed/frequency
The number of joules needed to raise the temperature of 100 grams of water by 10°C is the same as the number of joules needed to raise the temperature of 1,000 grams of water by what? Hint: Look at ratios – you don't need to do the q = m•Cp•Δt calculation!
Answer:
1°C
Explanation:
We know that the heat required to raise the temperature is given by :
[tex]Q=mc\Delta T[/tex]
m is mass
c is specific heat
[tex]\Delta T[/tex] is the change in temperature
ATQ,
[tex]m_1c\Delta T_1=m_2c\Delta T_2\\\\m_1\Delta T_1=m_2\Delta T_2\\\\\dfrac{100}{1000}=\dfrac{\Delta T_2}{10^{\circ}}\\\\\Delta T_2=1^{\circ}C[/tex]
Hence, the required temperature is 1°C.
A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh? a. 73.30 g b. 274.49 g c. 640.51 g d. 1,626.89 g
Answer:
c. 640.51
Explanation:
Given: 2.54 cm = 1 inch weighed 3.88 ounces
1 g = 0.035273 ounces
? = 3.88 ounces
? = (3.88 x 1) / 0.035273
? = 109.999 = 110 g
110 g = 3.88 ounces
2.54 cm = 110 g
14.79 cm = ?
? = (14.79 x 110) / 2.54
? = 640.51 g
According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces
x = 3.88 ounces
x= (3.88 x 1) / 0.035273
x = 109.999 = 110 g
110 g = 3.88 ounces
Thus,2.54 cm = 110 g
14.79 cm = x
x= (14.79 x 110) / 2.54
x = 640.51 g
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A State of Matter with No fixed Shape and
No fixed Volume
I need help pls help me I’m stuck
Answer:
True
Explanation:
All living things are made from many cells
Answer:
[tex]\huge\boxed{True}[/tex]
Explanation:
All living things are composed of cells which are the basic building blocks of living things.
Cell => Tissue => Organ => Organ System => Organism
So, Cell is the "basic" unit of living organism without which living things cannot be mage or cannot function.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807Why is the center of the galaxy only visible in radio waves?
Answer:
its to far to be seen with a telescope and it would take over 10 billion light yrs to travel there
Explanation:
How is the burning candle similar to a living organism?
Answer:
it responds to fire because the fire is something called the stimulus which forces the wax on the candle to melt.
A student is studying a sample of carbon dioxide gas inside a small syringe. At constant temperature the syringe has a volume of 89. 6 ml at a pressure of 3. 00 atm. When the syringed is expanded to a volume of 215 ml, what is the new pressure inside the syringe?.
The new pressure inside the syringe will be 1.25 atm
Gas lawAt constant temperatures, the volume of a gas is inversely proportional to its pressure.
Thus: P1V1 = P2V2
In this case, P1 = 3.0 atm, V1 = 89.6 mL, V2 = 215 mL
P2 = P1V1/V2
= 3 x 89.6/215
= 1.25 atm
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c. What is the heat of reaction for the process described in (a)? Hint: Apply Hess's law using the data in (b)
During a chemical reaction, the quantity of heat can only be added or removed in aim to maintain all of the components involved at almost the same temperature. It can be described by Hess's law.
What is Hess's Law?The total enthalpy change for a reaction is the sum of all changes, according to Hess's Law of Constant Heat Summation. The fact that enthalpy is just a state function is demonstrated by this law.
Hess's law can be expressed as:
Δ[tex]H_{reaction}[/tex] = ∑nΔ[tex]H_{product}[/tex] - ∑nΔ[tex]H_{reactant}[/tex].
where, n indicates stoichiometric coefficients, ΔH indicates enthalpy of reaction( reactant and product)
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Answer: 176.18 kJ/mol
Explanation:
Can someone help me with this question?
Answer:
View the attached photo, i wrote it roughly but i hope you will understand. And more common bromine is Bromine-79.
Explanation:
Remember Atomic number is number of protons OR of electrons.
atomic mass is the number of protons and neutrons.
i got neutrons by subtracting mass number and atomic number.
Bromine-79 is more common because all bromine atoms have 35 protons, this isotope would have 44 neutrons.
PLS HURRYThe moon does not light up by itself. Instead, it reflects light from the sun. Question 10 options: True False
Answer:
awnser is true took the test
Explanation:
i took the test
What is the defenition of protons?
Answer:
It's basically a positive charged atom.
Explanation:
Identify the correct statement regarding the strength of chemical bonds.
1. Strong bonds occur with high temperature and weak bonds with low temperature.
2. If the bond energy between atoms is very weak then the bond between the atoms is strong.
3. Strong bonds form with large atoms and weak balunds with small atoms.
4. If the bond energy between atoms is very high then the bond between the atoms is strong.
Answer:
4
Explanation:
bond energy which is high means that a bond is strong and the molecule containing that bond is less reactive.
The three-carbon structure that forms the backbone of a triglyceride is called.
Glycerol is the three-carbon backbone of triglycerides, while fatty acids are longer chains of carbon molecules attached to the glycerol backbone.
The property of matter that resists changes in motion is called?
Answer:
Inertia.
Explanation:
Its inertia it slows down objects with out it we would fly away.
A leaky faucet can waste 3,000 gallons of water per year. Which of the following is correct to convert the water wasted to liters/month? [1 gallon = 3.8 liters]
O Divide 3,000 by 3.8
O Multiply 3,000 by 12
Answer:The amount of water wasted per month will be 946.4 liters per month.Since 1 gallon = 3.8 litersTherefore, 3000 gallons will be:= 3000 × 3.8= 11356.24 gallons12 months = 1 yearThen, you'll divide the total gallons gotten by 12. This will be:= 11355.24 / 12= 946.4 liters per month.In conclusion, 946.4 liters per month is wasted.4 Liters per monthStep-by-step explanation:First you multiply 3,000 gal by 3.8 since 1 gal = 3.8 L which comes out to 11356.24 and then you divide that by 12 since theres 12 months in a year and you're trying to get liters wasted per month :)Hope this helps!
Explanation:
A sample of sodium hydroxide (naoh) has a mass of 160.0 g. the molar mass of naoh is 40.00 g/mol. how many moles of naoh does this sample contain? 4.000 moles 40.00 moles 160.0 moles 6,400 moles
The number of moles the sample of sodium hydroxide (NaOH) will contain is 4 moles.
How we calculate moles?Moles of any substance will be calculated by using the below formula:
n = W/M, where
W = given mass
M = molar mass
Given mass of NaOH = 160 g
Given molar mass of NaOH = 40 g/mole
On putting these values on the above equation, we get
n = 160 / 40 = 4 moles
Hence, required moles is 4 moles.
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Answer:
A). 4.000
Explanation:
Poopy fart fart
Question 2
5 pts
Which of the following is an example of conduction?
An old fashioned radiator
heat from a fire
touching a stove and burning your hand
Batteries
touching a hot stove and burning your hand
Which type of bond will form between two chlorine atoms?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond
Answer:
D. a nonpolar covalent bond
Answer:
D a nonpolar covalent bond
Explanation:
edge 2020
Consider the chemical equation in equilibrium. A(g) 2B(g) Double headed arrow. C(g) D(g) heat What will happen to the equilibrium of this reaction if the temperature is increased? It will shift to the left because heat is released. It will shift to the left because heat is absorbed. It will shift to the right because heat is released. It will shift to the right because heat is absorbed.
If the temperature is increased then reaction will shift to the left because heat is absorbed.
What is equilibrium state?Equilibrium of any reaction is that state in which concentration of reactant and concentration of product will be constant.
Given chemical reaction is:
A(g) + 2B(g) ⇄ C(g) + D(g)
From the equilibrium state reaction will move only that side which will contribute to maintain the stable state. In the forward reaction heat is released as mention in the question. So, when the temperature of reaction is increased then it shifts towards the left side by absorbing the heat and maintain the stability.
Hence, option (2) is correct, i.e. It will shift to the left because heat is absorbed.
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Answer:
B. It will shift to the left because heat is absorbed.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
The two basic properties of all matter are ______ and ______.
options for first blank
a. length B. volume
options for second blank
a. density B. mass
Answer:A-density and B-mass is the answer.
Explanation:
Answer:
1.) Density
2.) Mass
Explanation:
hello people ~
What happens when lead nitrate reacts with potassium iodide?
(a) They will not react
(b) Large amount of hydrogen release
(c) Yellow ppt of lead iodide and potassium nitrate will be produced
(d) Evolution of gas will occur
Answer:
Option C
Explanation:
The reaction is given by
[tex]\\ \rm\rightarrowtail {Pb(NO_3)_2\atop Lead\:nitrate}+{KI\atop Potassium\:iodide}\longrightarrow {KNO_3\atop Potassium\:nitrate}+{PbI_2\atop Lead\:Iodide}[/tex]
This is a double Displacement reaction
BER:
Which of the following predictions about global climate change is directly related to an increase in the burning of fossil
fuels?
a. increased extreme weather
b. decreased food supply
c. global warming
d. falling sea levels
oo
what is the atomic mass number ?
Answer:
Total number of protons and neutrons in an atom
Explanation:
PLEASE HELP! I will give brainliest!
4. You have knowledge of the outermost electron states of the atoms, trends in the periodic table, and the patterns of chemical properties. Use that knowledge to predict the products of each of the following equations. Then explain how you made your predictions. Be sure to balance the equations. (4 points)
a. ___NaBr + ___Ca → _______ + _______
b. ___Mg + ___O2 → _______
The reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
What is the electrochemical series?The electrochemical series has to do with the arrangement of atoms in order of reactivity. The metals that are up in the series are more reactive than the metals that are below.
In this case, the reactions are completed as folows;
2NaBr + Ca -----> CaBr2 + Na
2Mg + O2 ----> 2MgO
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