Answer:
b
Explanation:
exothermic... heat is released
What is the formula for copper sulfate with 2 waters adhering to each molecule?
Answer:
CuSO₄·2H₂O <=> Copper(II) Sulfate Dihydrate
Explanation:
CuSO₄ <=> Copper(II) Sulfate Anhydrate
CuSO₄·2H₂O <=> Copper(II) Sulfate Dihydrate
Explain why solids and liquids are difficult to compress
whereas gases can easily be compressed.
Answer:
Because they take up a certain amount of volume because there is no space in-between the particles, a gases can be compressed because there is alot of space in-between each particle
Explanation:
If I mix two chemicals in a test tube and notice after a few seconds that there are ice crystals forming on the outside of the test tube, I am witnessing a(n) *
Answer:
endothermic reaction
Explanation:
It simply means that you are witnessing an endothermic reaction.
An endothermic reaction is one that absorbs heat energy from its surrounding, thereby leaving the reaction vessel with a lower temperature as compared to before the reaction.
It is as opposed to exothermic reactions which are reactions that give off energy in the form of heat to the surrounding, thereby leaving a reaction vessel warmer than before the reaction.
In this case, the formation of ice crystals outside the test tube means that heat energy has been absorbed by the reaction which leaves the vessel a temperature cold enough to activate the formation of ice.
Determine when to put on disposable gloves for work in the lab. Select one: After cleaning all the glassware for the experiment Before entering the laboratory room After setting up all the glassware but before handling chemicals Before handling any glassware or chemicals for the experiment
Answer: Disposable gloves should be put on before handling any glassware or chemicals for the experiment for work in the lab.
Explanation:
Disposable gloves are helpful in protecting skin of a person from coming in direct contact with chemicals.
As a result, it is important to wear disposable gloves before handling any glassware or chemicals for carrying out an experiment.
Thus, we can conclude that disposable gloves should be put on before handling any glassware or chemicals for the experiment for work in the lab.
Which of the following best describes a pair of elements that will form an ionic bond
Answer:
One of the elements must be a metal and another be a non metal.
One of the elements must lose electrons and the other must gain electrons.
Given the structural formula: This compound is classified as an
Answer:
A.) aldehyde is the answer
From the given structural formula, the compound is ethanamide and thus, belongs to the group of amides. Thus, the correct option is B.
Amide is a functional group of organic compounds having an acyl group (R-C=O) linked to amine group (-NR¹R² where R¹ and R² are hydrogen atoms or alkyl groups). The amide functional group is given as -CON= (not double bond with N, but two distinct single bonds).
Amides can be classified into the following types depending on the moiety attached to nitrogen other than the carbonyl carbon:
1. Primary amides - amide in which the nitrogen atoms is attached to two hydrogen atoms
2. Secondary amides - in which the nitrogen atom is attached to one hydrogen and one alkyl group.
3. Tertiary amides - in which the nitrogen atom is attached to two alkyl groups.
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Which of the following statements is true?
a. ΔHfus = ΔHsolid
b. ΔHfus = –ΔHsolid
c. Hfus is always negative.
d. ΔHsolid is always positive.
Answer:
c. Hfus is always negative.
Explanation:
Because energy is released when fusing solids
What causes the reaction rate to decrease as the reaction progresses?
A. The concentration of the reactants decreases.
B. The reaction's activation energy decreases.
C. The rate constant of the reaction decreases.
D. The temperature of the reaction decreases.
Answer:
a
Explanation:
The concentration of the reactants decreases which causes the reaction rate to decrease as the reaction progresses and the correct option is option A.
What is Rate of a Reaction?
The rate of reaction refers to the speed at which the products are formed from the reactants in a chemical reaction.
The rate or speed of reaction can be defined as the change in the concentration of any one of the reactants or products per unit time.
Rate of reaction is affected by a change in concentration.
The chemical reaction rate increases with the increase in concentration and decreases with the decrease in the concentration of reactants.
Therefore, The concentration of the reactants decreases which causes the reaction rate to decrease as the reaction progresses and the correct option is option A.
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Tenisha solved the equation below by graphing a system of equations. help!!!!!
Answer:
(1.0, 1.4)
Explanation:
Graph the two equations [tex]\log_3 5x[/tex] and [tex]\log_5 (2x+8)[/tex]. The point of intersection is the solution to the system of equations.
Graph on Desmos:
[tex]\log_3 5x\implies \text{Red},\\\log_5 (2x+8)\implies \text{Blue}[/tex]
Which of the following is the balanced chemical equation that represents the chemical reaction of hydrogen and oxygen to produce water
Answer:
The following equation describes the burning of hydrogen gas to form liquid water. 2H2(g) + O2(g) → 2H2O(l ) Chemical equations give the following information about chemical reactions.
Explanation:
your car tire is filled with air at a pressure of 2.18 atm and have a volume of 10.0L. After riding around for a couple month,your tire pressure goes down to 1.85 atm. what is new volume of your tire
Answer:
The new volume of the car tire is approximately 11.784 litres
Explanation:
The initial pressure of the air in the car tire, P₁ = 2.18 atm
The volume occupied by the air in the tire, V₁ = 10.0 L
The new pressure of the air in the tire, P₂ = 1.85 atm.
According to Boyle's Law, we have;
P₁·V₁ = P₂·V₂
Where;
P₁ = The initial pressure of the car tire = 2.18 atm
V₁ - The initial volume of the tire = 10.0 L
P₂ = The new pressure of the tire = 1.85 atm
V₂ = The new volume of the car tire = The required volume
Therefore;
[tex]V_2 = \dfrac{P_1 \cdot V_1}{P_2}[/tex]
Plugging in the values gives;
[tex]V_2 = \dfrac{2.18 \ atm \times 10.0 \ L}{1.85 \ atm} = \dfrac{436}{37} \ L \approx 11.784 \, L[/tex]
The new volume of the car tire, V₂ ≈ 11.784 L.
WHAT IS EXOTHERMIC EXPLAIN
please ।
।।।
Answer:
Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.Explanation:
I hope this helps u have a nice day ☘Answer:
An EXOTHERMIC reaction is when energy is released.
Convert 50 gr of water into moles and into molecules of H2O.
Use mathematics to prove that the 5.50 grams of salicylic acid (C7H6O3) used in this experiment is equal to 0.04 mol.
Answer:
Please find the answer to the question below
Explanation:
In chemistry, the following mathematical formula is used to calculate the number of moles contained by a substance:
mole = mass of substance (g)/molar mass of substance (g/mol)
Molar mass of salicylic acid (C7H6O3) = 12(7) + 1(6) + 16(3)
= 84 + 6 + 48
= 138g/mol
Mass = 5.50grams
mole = 5.5/138
mole = 0.039
Approximately, the number of moles of 5.5grams of salicylic acid is 0.04moles. This is in accordance with the mole value (0.04) given in this question.
What is the volume of 0.24 mol oxygen (O2) gas at 345 K and a pressure of
0.75 atm?
(The universal gas constant is 0.0821 L'atm/mol K.)
A. 89 L
B. 9.1 L
C. 0.11 L
O D. 5.12
Answer:D
Explanation:
It’s the right answer
The concept ideal gas equation is used here to determine the volume of the gas. The volume of 0.24 mol oxygen gas at 345 K and a pressure of 0.75 atm is 9.1 L . The correct option is B.
What is ideal gas equation?The combination of Boyle's law, Charles's law and Avogadro's law leads to an equation which gives the combined effect of temperature and pressure on the volume of a gas. This equation is called the ideal gas equation.
The ideal gas law is also called the general gas equation.
The ideal gas equation is given as:
PV = nRT
n = Number of moles
P = Pressure
V = Volume
R = Gas constant
T = Temperature
Volume = nRT / P
V = 0.24 × 0.0821 × 345 / 0.75
V = 9.06 L ≈ 9.1 L
Thus the correct option is B.
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one use for an electromagnet?
Answer:
It is used in induction of electric current through electromagnetic induction.
which does not increases the speed of a reaction
Explanation:
this is my answer correct me if I'm wrong
If the reactants don't have enough energy,a reaction won't occur even if the reactants do collide at the reactive site . Notice that at the lower temperature ,very few of the reactant of kinetic energy needed to provide the activation energy.
Does water inside a vacuum boil at a higher or lower temperature than it does under normal pressures?
Answer:
lower temperature
Explanation:
When we boil water at vacuum, it boils at a lower temperature than the normal temperature
Boiling is defined as a physical phenomenon where bubbles are formed and they turn into vapor when the liquid is brought into heat.
The pressure is also decreased when water is heated under vacuum. The atmospheric pressure is reduced as the pressure is removed when water water boils at vacuum.
Thus, water inside vacuum boils at a lower temperature than it does under the normal pressure.
What effects do catalysts have on chemical reactions?
1.Catalysts slow down chemical reactions
2.Catalysts reverse chemical reactions
3.Catalysts speed up chemical reactions
4.all of the above
Answer:
3
Explanation:
7.296 x 10^2 / 9.6 x 10^-9
Answer:
7.6x10^-8
Explanation:
When your body is warmed by the sun during the winter, this process is said to be
a. exothermic.
b. endothermic.
c. isothermic.
d. none of the above
Answer:
B. Endothermic
Explanation:
Your body is absorbing the heat.
If 15.0 mL of phosphoric acid completely neutralizes 38.5 mL of 0.150 mol/L calcium hydroxide, what is the concentration of the phosphoric acid?
Answer:
Let me give it a try.
H3PO4 + Ca(OH)2 = Ca3(PO4)2 + H2O
Balancing this reaction
2H3PO4 + 3Ca(OH)2 == Ca3(PO4)2 + 6H2O.
Moles= Molarity x Volume
Volume = 38.5ml = 0.0385L
Moles of Ca hydroxide = 0.150m/L x 0.0385L
(Notice the units canceling out...leaving moles).
=0.005775moles of Ca(OH)2.
From balanced reaction...
3moles of Ca(OH)2 completely reacts with 2moles of H3PO4
0.005775moles of Ca(OH)2 would completely react with....
= 0.005775 x 2/(3)
=0.00385moles of H3PO4.
Now we're looking for its Concentration in Mol/L
Molarity=Moles of solute/Volume of solution(in L)
Volume of solution assuming no other additions to the reaction = 15ml + 38.5ml =53.5ml =0.0535L
Molarity = 0.00385/0.0535
=0.072Mol/L.
If this is wrong
then Simply Try The formula for Mixing of solutions
C1V1 = C2V2
0.15 x 38.5 = C2 x (15+38.5)
C2 = 0.11M/L.
An example of a product made from a synthetic material is
Question 5 options:
A)
a PET plastic water bottle.
B)
knitted wool socks.
C)
a cotton t-shirt.
D)
a pine 2×4 board.
Hi there! A simple answer and explanation is below :)
Answer:
A) PET plastic water bottle
Explanation:
Plastic goes through a manufacturing process before being used to make bottles for liquids like milk, soda, motor oil, and shampoo, as well as dry items like pharmaceuticals and nutritional supplements. Plastic is made up of a variety of organic polymers, including polyethylene and ethylene, in its unprocessed condition. In a soft state, plastic can be molded into the desired shape and then cast into a solid stat
When a scientist sorts a draw containing different colour socks what skill is she using?
Answer:
sorting/classifying
Explanation:
.
Beryllium (Be) and fluorine (F) combine to make the compound BeF2. What is the chemical name for this compound?
A.
beryllium fluoride
B.
beryllium fluorine
C.
beryllide fluoride
D.
beryllide fluorine
Answer:
The answer you're looking for is A
Explanation:
A is the answer
Explanation:
What is the change in temperature, if a 70.0 gram sample of nickel absorbs 1756 J of energy? Nickel has a specific heat of 0.440 J/g °C.
Answer:
[tex]\Delta T=57.01^{\circ} C[/tex]
Explanation:
Given that,
The mass of nickel, m = 70 g
Energy absorbed, Q = 1756 J
The specific heat of Nickel, c = 0.440 J/g °C
We know that,
The heat absorbed is given by :
[tex]Q=mc\Delta T\\\\\Delta T=\dfrac{Q}{mc}\\\\\Delta T=\dfrac{1756}{70\times 0.44}\\\\=57.01^{\circ} C[/tex]
So, the change in temperature is equal to [tex]57.01^{\circ} C[/tex].
Which sequence of steps describes the life cycle of a lake?
A. Runoff fills a depression - sediments build up - water becomes
increasingly shallow
B. Runoff fills a depression - sediments are eroded - water becomes deeper
C. Runoff fills a depression - sediments build up
- water rises continuously
D. Runoff fills a depression - sediments are eroded - water spreads over a wider area
Answer:
The actual sequence of steps which describe the life cycle of a lake is given below:
C. Runoff fills a depression - sediments build up
- water rises continuously
Explanation:
This is because, the water which builds up as a result of the runoff water accumulating on the depression helps towards building up. When it must have accumulated greatly, it ends up forming a lake.
if five elements have atomic numbers 2,3,6,9 which two numbers are the most reactive??
Explanation:
[tex]element \: with \: 2 \: atomic \: number \\ \\ is \: stable \: because \: it \: has \: already \: \\ \\ completed \: its \: orbit \: \\ \\ but \: atomic \: number \: with \: 3 \: and \: 9 \\ \\ will \: have \: to \: become \: stable \: \\ \\ after \: giving \: one \: electron \\ \\ so \: \: element \: with \: 3 \: and \: 9 \: atomic \: number \\ \\ is \: most \: reactive[/tex]
What does a vacuole mean
Answer:
a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.
or
a small cavity or space in tissue, especially in nervous tissue as the result of disease.
How is the height of grasses in grasslands related to precipitation?
Short and tall grasses prefer very low amounts of precipitation
o Shorter grasses grow in areas that receive more precipitation
o Taller grasses grow in areas that receive more precipitation
o Short and tall grasses prefer the high amounts of precipitation
Answer:
It just does
Explanation:
Answer:
Tallgrass Praries have more Rainfall
Explanation:
