A reaction between colorless substances can produce a colored precipitate by formation of new ionic compound.
What is an ionic compound?An ionic compound is a compound that is made up of two elements, one metal and the other non metal, which are held together by an ionic bonding.
When reaction occurs between two colourless substances, colored precipitate results by formation of new ionic compound.
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Drag each tile to the correct location.
Classify the reactions as endothermic or exothermic.
The reaction between
ammonium nitrate and
water absorbs heat
from the surrounding
environment.
Three drops of concentrated
sulfuric acid added to 100
milliliters of water in a beaker
makes the beaker hot.
Ammonium chloride dissolved
in a beaker of water makes the
beaker cold.
Uranium atoms are split to
produce nuclear energy.
Water separates into
hydrogen and oxygen
when an electric current
is run through it.
Methane and oxygen are
combined to produce
methanol and heat.
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Post Test: Chemical Reactions
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First and fifth reaction shows endothermic reaction while the rest of it shows exothermic reaction.
What reaction shows exothermic and endothermic reaction?The reaction between ammonium nitrate and water is an example of endothermic reaction because it absorbs heat from the surrounding environment.
Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot because exothermic reaction occur.
Ammonium chloride dissolved in a beaker of water makes the beaker cold which shows that it is exothermic reaction because heat leaves the solution.
Uranium atoms are split to produce nuclear energy is an example of exothermic reaction.
Water separates into hydrogen and oxygen when an electric current is run through it that shows endothermic reaction.
Methane and oxygen are combined to produce methanol and heat is an example of exothermic reaction.
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2. Metals react with water and release hydrogen gas. Explain why non-metals do not release hydrogen gas when reacted with water.
Answer:
Its because non-metals are unable to break the bond between the H and O ion and cannot reduce hydrogen by donating electrons
hydrochloride acid +_________ zinc chloride +hydrogen
Answer:
Hydrochloride acid + Zinc = Zinc Chloride + Hydrogen
Explanation:
When Hydrochloride acid and Zinc react, it results in the formation of Zinc chloride and hydrogen.
Hope I helped
What temperature, in Kelvin, does a 1.00 gram sample of Ne in a 2.50 L container need to be adjusted to in order to bring the pressure to 1.00 atm? Report your answer to the nearest Kelvin. (Moodle is looking for a number only, no units.)
The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
How to calculate temperature?The temperature of a given gas can be calculated using the ideal gas law equation:
PV = nRT
Where;
P = pressure = 1.00 atm
V = volume =2.50 L
R = gas law constant = 0.0821 Latm/molK
Mass =1.00 gram
The molar mass of Ne= 20.1797 u
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{1.00}{20.1797}[/tex]
Moles = 0.049mol
T = temperature=?
Putting the value in the equation:
PV = nRT
1.00 atm × 2.50 L = 0.049mol × 0.0821 × T
T = 621.44K
Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
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How to convert °c 40 to °f
Answer:
104 f
Explanation:
multiply 40 by 1.8 and then add 32
You might also want to challenge other commonly accepted green ideas or the impact of the various green activities . For example , what is the relative impact of these green measures ? What mass of carbon do these various common activities use up ?
1. Washing clothes at 300 degrees instead of 400 .
2. Shutting your computer down every night .
3. Using low - energy light bulbs instead of regular light bulbs ..
4. Switching off television instead of leaving it on standby .
5. Boiling only 1 cup of water at a time , instead of a whole kettle .
2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.
0.467 mol NaCl are needed to
create a 0.875 m solution using 534
g of water. How many grams of
sodium chloride are required to
make the solution?
The mass, in grams, of sodium chloride needed would be 27.29 grams.
Number of molesThe number of moles of a substance is mathematically given as:
Mole = mass/molar mass.
Thus, mass = mole x molar mass.
In this case, 0.467 moles of NaCl is needed. The mass of 0.467 moles of NaCl can then be calculated as:
Mass = 0.467 x 58.44 = 27.29 grams.
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Practice question 1 How many moles are in 5.64e25 atoms of iron (Fe)?
1 mole is equal to 6.0220 x 1023 atoms of any element.
what are the benefits of organic farming
How many molecules of SF6
are in 25.0 g SF6?
[ ? ]×10⁰²] molecules SF6
SF₆
Molar mass: 146.06 g/mol
mole = 25 : 146.06 = 0.171
molecules:
=0.171 x 6.02 x 10²³
=1.03 x 10²³
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
O the neutron and the electron
O the proton and the electron
O the proton and the neutron
O the neutron and the atom
Answer:
the pro on and the electron
how many atoms of of titanium are present in a sample containing 0.375 moles Ti
2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.
What are moles?A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
To find the number atoms we need to multiply by 6.02214076 × 10^{23}.
0.375 moles x 6.02214076 × [tex]10^{23}[/tex]
2.258302785 x [tex]10^{23}[/tex]
Hence, 2.258302785 x [tex]10^{23}[/tex] atoms of titanium are present in a sample containing 0.375 moles of Ti.
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If a gas occupies 1532.7 mL at standard temperature, what volume does it occupy at 49.4 ºC if the pressure remains constant?
a. 1810
b. 1300
c. 276
d. 3.80e5
Answer:
a. 1810mL
Explanation:
When conditions for a gas change under constant pressure (and the number of molecules doesn't change), it follows Charles' Law:
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex] where the temperatures must be measured in Kelvin
To convert from Celsius to Kelvin, add 273, or use the equation: [tex]T_C+273=T_K[/tex]
For this problem, one must also recall that standard temperature is 0°C (or 273K).
So, [tex]T_1 = 273[K][/tex], and [tex]T_2 = (49.4+273)[K]=322.4[K][/tex].
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K])}=\dfrac{V_2}{(322.4[K])}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K\!\!\!\!\!{-}])}(322.4[K\!\!\!\!\!{-}] )=\dfrac{V_2}{(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})[/tex]
[tex]1810.04571428[mL]=V_2[/tex]
Adjusting for significant figures, this gives [tex]V_2=1810[mL][/tex]
explain the bonding nature in NaCl with diagram
Explanation:
NaCl is the compound that we want to know the Bonding structure of
in chemistry when a metal (Na) combines with a non metal (Cl) it is know as an ionic compounds
the type of bonding in ionic compounds is an ionic bond
Can someone help me please
Answer:
4) x = 4Explanation:
Using Intersecting Chords Theorem,
AB × CB = BE × BD
( 4x + 2) × 8 = 9 × ( 4x ) 32x + 16 = 36x16 = 36x -32x (Subtract)16 = 4x (Divide both sides by 4)x = 16/ 4 (Divide)x = 4--------------------------What does a standard enthalpy change mean?
Standard enthalpy change refers to a change in the amount of energy in a reaction that occurs under standard conditions.
What is standard enthalpy change?It is a property that measures the change in the amount of energy in a reaction involving the formation of substances from pure elements.
Such a reaction must happen under standard conditions which include 1-atmosphere pressure and 298.15 K temperature.
It is designated by ΔH°.
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What happens is the PH changes
The changes in different properties such as concentration etc will change if the pH experiences a change.
What is pH?
This is referred to the power of hydrogen and is a measure of the degree of acidity or alkalinity of a substance.
When pH changes, the concentration as well as other properties in this context.
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what is the simplest formula of a compound with 4.433g phosphorus and 5.717g oxygen?
Answer:
empirical formula is the simplest formula of a compound with 4.433g phosphorus and 5.717g ooxygen.
How many calories are in a
banana containing 410 kJ of
energy?
[? ] cal
Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 0.0042 Kilo Joules.
97619.04 Calories of energy will be present in 410 KJ.
Therefore, Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
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15. What will be the volume of a given mass of oxygen at 250C if it occupies 100cm3 at 150C.? (Pressure remain constant)
Answer:
V₂ = 167 cm₃
Explanation:
Because you are only dealing with volume and temperature, you can use Charles' Law to find the missing value. This formula looks like this:
V₁ / T₁ = V₂ / T₂
In this formula, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You have been given values for all of the variables except for final volume. Therefore, by plugging these values into the formula, you can simplify to find your answer.
V₁ = 100 cm³ T₁ = 150 °C
V₂ = ? T₂ = 250 °C
V₁ / T₁ = V₂ / T₂ <---- Charles' Law formula
(100 cm³) / (150 °C) = V₂ / (250 °C) <---- Insert values
(0.667) = V₂ / (250 °C) <---- Simplify left side
(0.667) x (250 °C) = V₂ <---- Rearrange
167 = V₂ <---- Simplify left side
The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of an hydrogen oxygen sodium carbon helium
a. hydrogen
b. oxygen
c. sodium
d. carbon
e. helium
Answer: a. hydrogen
This is a fact.
Carbon is the reference taken to assign the atomic mass unit
One twelfth of the mass of unbound carbon-12 is taken as 1amuThe unit for the atomic mass constant is Dalton (Da)This unit is standard when doing calculations in chemistry and physics1amu = 1.6605x10⁻¹⁹gThis was also derived from the law of definite proportionsThis standard has been set by the International Union of Pure and Applied Chemistry (IUPAC)The IUPAC is responsible for assigning various standards such as the nomenclature of various compounds, and updating the periodic table of elements.According to the IUPAC carbon is the reference taken to assign the atomic mass unitLearn more about atomic mass units here:
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An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?
o The potential energy and kinetic energy remain the same.
o The potential energy decreases as kinetic energy increases.
o The kinetic energy decreases as potential energy increases.
o The kinetic energy remains at zero, but potential energy increases.
The kinetic energy decreases as potential energy increases. Hence, option C is correct.
What is potential energy?Potential energy is stored energy that depends upon the relative position of various parts of a system.
As the target is fired high on the wall, the change in the energy that is observed as the arrow moves toward the target is kinetic energy starts to decrease as the arrow reaches nearer to the target and the potential energy is observed to increase.
So, in short, the energy transformation is from kinetic energy from a moving arrow to potential energy when the arrow hits the target.
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In desperate need of help!!!!!!!
Answer:
The answer will be false.
Explanation:
because it is not balanced.
A 10.0 ml portion of 0.010 m hcl is diluted by adding it to100.0 ml of water. what is the ph of the solution
From the calculation, the pH of the solution after dilution is 3.
What is the pH?The pH is the hydrogen ion concentration of the solution. Now we know that;
C1 = 0.010 m
V1 = 10.0 ml
V2 = 10.0 ml + 100.0 ml = 110 ml
C2 = ?
C1V1 = C2V2
C2 = C1V1 /V2
C2 = 0.010 m * 10.0 ml / 110 ml
C2 = 0.00091 M
pH = -log[0.00091 M]
pH = 3
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if the temperature of this equilibrium was increased, what would happen to the equilibrium yield of chlorine?
Answer:
the temperature of the system decreases
A solution is 0.225M Na2SO4. What is the molarity of the sodium ion in solution
The molarity of the sodium ion in the solution is 0.450 M.
How do we determine the molarity of sodium ions in a solution?The molarity of the sodium ion in a solution can be determined by the dissociation of the given solution Na2SO4(sodium sulfate).
The dissociation of Na2SO4 is computed as follows:
1 mole of Na2SO4 dissociates to give 2 moles of sodium cations and 1 mole of sulfate anion.i.e.
[tex]\mathbf{Na_2SO_4 \to 2Na^{+} + SO_4^{2-}}[/tex]
The molarity for sodium-ion [Na+] is:
= 2 × 0.225 M
= 0.450 M
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6.0 mol NaOH reacts with
9.0 mol H3PO4 according to
the equation below:
3NaOH + H3PO4 → 3H₂O + Na3PO4
How many moles of Na3PO4 form from
9.0 mol H3PO4?
[?] mol Na3PO4
Round your answer to the tenths place.
Taking into account the reaction stoichiometry, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.
Reaction stoichiometryIn first place, the balanced reaction is:
3 NaOH + H₃PO₄ → 3 H₂O + Na₃PO₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
NaOH: 3 moles H₃PO₄: 1 mole H₂O: 3 molesNa₃PO₄: 1 moleLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of H₃PO₄ reacts with 3 moles of NaOH, 9 moles of H₃PO₄ reacts with how many moles of NaOH?
[tex]moles of NaOH=\frac{9 moles of H_{3} PO_{4} x3 moles of NaOH}{1 mole of H_{3} PO_{4}}[/tex]
moles of NaOH= 27 moles
But 27 moles of NaOH are not available, 6 moles are available. Since you have less moles than you need to react with 9 moles of H₃PO₄, NaOH will be the limiting reagent.
Moles of Na₃PO₄ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 3 moles of NaOH form 1 mole of Na₃PO₄, 6 moles of NaOH form how many moles of Na₃PO₄?
[tex]moles of Na_{3}P O_{4} =\frac{6 moles of NaOHx1 mole of Na_{3}P O_{4} }{3 moles of NaOH}[/tex]
moles of Na₃PO₄= 2 moles
Then, 2 moles of Na₃PO₄ can be produced when 6.0 mol NaOH reacts with 9.0 mol H₃PO₄.
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Answer:
The first one is 2 but the second one is 9
Explanation:
What is the complete ionic equation for NaOH(aq) + HCl(aq) → H₂O()) + NaCl(aq)?
Answer:
OH-(aq)+H+(aq)->H2O(l)
Answer is shown in photo.
Explanation :
APEX
Atoms and the chemical bonds that connect them cannot be observed with your eyes, so it is necessary to use a
a. microscope
b. theory
c. model
d. both (b) and (c)
Answer: d. both (b) and (c)
Explanation:
Atoms are too small to be seen on microscopes, so we model them based on theories.
How does separating CHEMICALS through DISTILLATION harm the environment ?
Explain in your own words
Explanation:
Distillation is the separation of mixture of two liquids which differ in boiling point. Through Distillation vapour that is formed spread thoroughly in our environment
