Answer:
The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
B- A piece of metal is placed in Water and produces sparks and gas.
what do uh mean by ionic or electrovalent bond ?
thankyou ~
This is a type of bond present in electrovalent compounds.
What is Electrovalent Bond?This is a type of bond that exist in electrovalent or ionic compounds. It is formed as a result of combination between a positive cation and a negative anion. This results in the transfer of electron from the cation to the anion. This type of bond in which there's a complete transfer of electrons between both parties occurs easily as a result of the electronegative difference between the combining atoms. Compounds that show this type of bonding are combination between group 1 or 2 elements with group 16 or 17 elements.
Compound formed through this bond are strong, mostly dissolves in polar solvents due to their polar charges and also conducts electricity.
Learn more on electrovalent bonds here;
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can someone please answer this question for me? i will mark brainliest and it would also be really appreciated! :)
During an experiment water was heated in a container covered with a glass lid. The following observations were recorded.
Observation 1: Water droplets form on the inside of the glass lid.
Observation 2: Bubbles rise as the water starts boiling.
Based on the observation, justify the type of change (physical or chemical) that took place. (4 points)
Based on the observations, the change is physical.
This is because the matter is still the same composition after the change, while a chemical change would change the composition.
Based on the observations, both physical and chemical changes have occurred during the experiment.
Observation 1: Water droplets form on the inside of the glass lid. This is a physical change.
Observation 2: Bubbles rise as the water starts boiling. This is a chemical change.
A physical change is a transformation in a substance's state, shape, or form that does not alter its chemical composition or create new substances. During a physical change, the original substance remains the same, and no chemical bonds are broken or formed.
A chemical change, also known as a chemical reaction, involves the conversion of one or more substances into new substances with different chemical compositions. Evidence of a chemical change includes the production of gas, formation of a precipitate, release or absorption of heat or light, and changes in color and odor.
In observation 1, the water vapor in the air comes into contact with the cooler glass surface of the lid and condenses back into liquid water. Condensation is a physical change where a gas changes into a liquid.
Observation 2- Boiling is the process of converting liquid water into water vapor (gas) by absorbing heat energy. The heat causes water molecules to gain energy and transform into gas, forming bubbles that rise to the surface. This change involves the breaking of intermolecular forces between water molecules and is a chemical change.
Learn more about Physical and Chemical change, here:
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#SPJ3
Heather ran 100 meters in 20 seconds. What is her speed? Just type the number, no labels.
What is the general formula for cycloalkenes.
Food deteriorates more slowly in a refrigerator because?
Answer:
as temperature increases it speeds up chemical reactions and that accelerates the spoiling process of food. Keeping food in a cold place (a fridge) slows down those processes.
Need help soon as possible
Answer:
The oeriodic table have 8 groups
No eh I cant do this omg
Answer:
you can do it
Explanation:
Classify the following reaction:
CaO(s) + H₂O(l) → Ca(OH)₂(s)
A) synthesis (or combination)
B) decomposition
C) combustion
D) single displacement (replacement)
E) double displacement (replacement)
Answer:
D) I think is single displacement (replacement)
Can someone help with this, i’m getting lost in the steps. Like I start off right (i think) then it just gets confusing.
Answer:
28.12 kg
Explanation:
Here we are given that the density of copper is 8.92 g/ cm³ .
[tex]\sf \longrightarrow \rho_{(copper)}= 8.92 g/cm^3\\ [/tex]
And we are interested in finding out the mass of the given block . The dimensions of the block is 0.052m × 311mm × 19.5 cm .
Firstly find out the volume in cm³ as the density is in cm³ .[tex]\sf \longrightarrow Volume_{cuboid}= length * breadth * height \\ [/tex]
1cm = 0.01 m 1cm = 10mm[tex]\sf \longrightarrow Volume = (0.052)(100) * (311\div 10) *(19.5) cm^3 \\ [/tex]
[tex]\sf \longrightarrow Volume = 5.2 * 31.1 * 19.5 cm^3 \\ [/tex]
[tex]\sf \longrightarrow Volume = 3153.54 cm^3\\ [/tex]
Now we may use Unitary Method to find out the mass of the block as ,
Mass of 1cm³ of copper is 8.92 g .
Mass of 3153.54 cm³ of copper will be 8.92*3153.54 g = 28129.57 g
And we know that 1kg = 1000g , so[tex]\sf \longrightarrow \underline{\boxed{\bf Mass_{Cu}= 28.12 \ kg }} \\ [/tex]
In order for rollercoaster to work, why does the hill the cart climbs need to be higher than the top of the loop?
Answer:
"At the top of the first and tallest hill, your potential energy is at its highest it will ever be on this ride. As you begin to descend, your potential energy decreases until it's all gone at the bottom of the hill." The shorter the hill the roller coaster climbs, the greater its kinetic energy.
How is steal wool and oxygen making iron oxide a chemical reaction? Why?
Answer:
When iron wool combusts, it reacts with oxygen from the air to form iron oxide. Iron oxide is a solid, so the oxygen atoms from the air add to the mass on the balance. The balance tips as the iron wool reacts with the oxygen to form solid iron oxide. from.
Explanation:
The bell rings at the end of
class and you jump up to head
for the door. When you stand
up, you feel
light-headed.
What happens in your body? What systems are involved ?
Muscular and nervous system involved
Based on the volcanic mountain range shown on the map, describe the motion of
the plates and identify the type of plate boundary in this region.
Answer:
convergent boundary subduction zone
Explanation:
Answer:
The motion of the plates would be considered a convergent boundary which is where old crust goes under the new crust and is reheated overtime. This could also be known as a convection current. This is when the mantle is heated up and rises to the top an when it cools off, it goes back down and then that cycle repeats itself overtime.
Explanation:
Plato
I need an answer now please asap and you will me marked brainiest please it's missing I need it now.
Answer:
alll of them are possible, besides the last one
Explanation:
All of them are correct compounds besides the last one. The last one isn’t a correct compound because the second element does not exist
#NaO_2
ImpossibleNa has valency 1 so O can never have 2 as subscript.Correct compound=Na_2O
#MgCl_2
PossibleValency of Mg is 2 and Cl is 1 so yes#CaF
ImpossibleCa has valency 2 not 1#NaBr
PossibleNa has valency 1 and Br has 1#KHe
ImpossibleHelium is a noble gas so can't form compounds
What is the molar mass of Al(BrO2)
Answer:
The molar mass is 138.8843 g/mol
Help!
Which statement about common descent is correct?
A Few species on Earth descended from a common ancestor; most life occurred independently.Few species on Earth descended from a common ancestor; most life occurred independently.
B All life on Earth descended from a common ancestor.
C Some species on Earth descended from a common ancestor; other species do not share any lineage.
D Most species on Earth descended from a common ancestor; some species do not share any lineage.
Answer:
All life on Earth descended from a common ancestor
Determine the element symbol, mass number, and charge for an atom or ion that has a 51 neutrons, 38 protons, and 36 electrons.
Answer:
Strontium
Explanation:
To find the element, we need to know the atomic number. There is this rule in chemistry that says that the number of protons and the atomic number are the same. Since we know that there are 38 protons, the atomic number is also 38, leading us to Strontium. Sr -- element symbol.
The mass number is located below the element symbol on a periodic table. The mass number or the atomic mass for Strontium is 87.62 u.
Since there are an uneven amount of protons and electrons, let's subtract the number of electrons from the number of protons to find the difference. 38-36 = 2. (Also, protons are positive and electrons are negative, meaning there are more + than - in the ionic charge). Which means, the atom has a +2 ionic charge.
Match these items.
1 .
water droplets
necessary organisms in nitrogen cycle
2 .
denitrification
release of nitrogen from nitrogen compounds
3 .
bacteria and plants
process of using oxygen to obtain energy from carbon-containing food
4 .
respiration
forms as water vapor condenses
5 .
people and animals
use plants for food
Hi, im really confused can someone help
Answer:
Point - C
Explanation:
Ethylamine has a molar mass = 45.08 g/mol
While, HBr has molar mass = 80.91 g/mol
This means ethylamine will travel more distance than HBr in given time.
So, the white solid (Ethylammonium bromide) will form at point C.
Why Point C?
Point C is the only point which is farthest from ethylamine and closest to HBr. This point depicts that ethylamine has travelled more distance than HBr.
If 550 mL of a 3.50 M KCl solution are set aside and alowed to evaporate unti the
volume of the solution is 275 ml, what will the molarity of the solution be?
1) list givens and convert if necessary
C₁ = 3.50 mol/L
V₁ = 0.550 L
C₂ = ?
V₂ = 0.275 L
2) rearrange formula
[tex]C_{1}V_{1}=C_{2}V_{2}\\\\C_{2}=\frac{C_{1}V_{1}}{V_{2}}[/tex]
3) solve
[tex]C_{2}=\frac{(3.50\ mol/L)(0.550\ L)}{(0.275\ L)}[/tex]
C₂ = 7.00 mol/L
Mary has blue eyes (bb) and David has brown eyes (Bb), if David and Mary have four children
what will their eye color be? Will all of their children have the same eye color? Why or why not.
Answer:
If they all had the same eye color it would probably be hazel, but If they did not then it would either be blue or brown.
Explanation:
Hope this helps
[tex]\bold{Choose \: the \: correct \: Answer :D\: }[/tex]
Answer:
Option B is correct.
Explanation:
Distance refers to the distance traveled by a body.
Hope it will help you.
2. An elements has the atomic number of 12. A mass
number 24. Find a number of neutrons.
b. number of Elections.
a number of Protons.
serbec
Answer a) 12 neutrons
b) 12 electrons
a) 12 protons
Explanation:
The atomic number is the number of protons in an atom and is also the number of electrons
therefore, the number of protons and electrons = 12
the mass number of an element is = # of protons + # of neutrons
if we rearrange it to find # of neutrons,
# of neutrons = mass number - # of protons
so, 24 - 12 = 12 neutrons
How many moles of Sulfur (S) are equal to 1.806 x 10^24 atoms Sulfur?
a) 1.000 mole S
b) 3.000 mole S
c) 1.100 x 10^48 mole S
Answer:
b) 3.000 mol S
Explanation:
using Avogadro's constant
1 mol = 6.02 × 10^23 atoms
we need to find the number of moles for 1.806 × 10^24
x = 1.806 × 10^24
putting it together we now have:
1 mol = 6.02 × 10^23 atoms
x = 1.806 × 10^24
cross multiply
6.02 × 10^23 x = 1.806 × 10^24
divide both sides by 6.02 × 10^23
x = (1.806 × 10^24) ÷ (6.02 × 10^23) = 3 mol
14. Through which of the following mediums is the velocity of a sound wave the greatest?
A. Air
B. Water
C. Steel
D. Lead
Option C is the right answer
The medium through which the velocity of a sound wave is greatest is: C. steel.
What is a sound wave?A sound wave can be defined as a form of mechanical wave that requires a medium for its propagation and it creates a disturbance in the medium. Thus, a sound wave needs a medium to travel and it creates a disturbance when it travels through any medium.
The parameters of sound wave.Some examples of the parameters of a sound wave include the following:
FrequencyWavelengthAmplitudeVelocityGenerally, the velocity of a sound wave is greatest in a solid medium such as steel than in liquid or gaseous medium.
Read more on sound wave here: https://brainly.com/question/19250621
In cold climates, rocks are broken into pieces by the action of water. This process that breaks down rocks and helps form soil can best be explained as
Oleaching of minerals from the rock.
decomposition due to the action of ice crystals.
chemical weathering due to water reacting with calcite.
mechanical weathering due to alternate freezing and thawing.
Answer:
The answer is chemical weathering due to water reacting with calcite
Explanation:
The causes of chemical weathering include the action of water, oxyen, carbon dioxide, living organisms, and acid rain.
how many moles of KCIO3 must be consumed to create 4.5 moles of KCI
Answer:
4.5
Explanation:
2KClO3 ===> 2KCl + 302
Let the number of moles of KClO3 = x
2KClO3 ===> 2KCl + 302
Since the balance numbers are the same for both chemicals KClO3 and KCl whatever you need to get for KCl will be the same as for the KCl
x = 4.5
A sample of argon has a volume of 1.20 L at STP. If the temperature is increased to 26.0°C and the pressure is lowered to 0.800 atm, what will the new volume be, in L?
Key words:-
Pressure=PVolume=VTemperature=TNow
P1=1atmP_2=0.800atmV1=1.2LV2=LT1=273KT2=26°C=299KApply combined gas law
[tex]\\ \tt\hookrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{1(1.2)}{273}=\dfrac{(0.800)V_2}{299}[/tex]
[tex]\\ \tt\hookrightarrow 0.004=0.002V_2[/tex]
[tex]\\ \tt\hookrightarrow V_2=2L[/tex](Approx)
4. How many feet are in 3.45 km?
Answer:
11318 feet and 10.771 inches
Explanation:
there is 3280.84 in one Km
just do 3280.84x3.45
Please help me with this one true or false
Answer:
41. False
42. True
43. False
44. False
45. True
46 - 48. Unsure (I don't take Biology, sorry.)
Explanation:
41.
FeS and HCl are the reactants of the chemical equation. Hence, false.
42.
It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.
43.
Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.
44.
Fluorescence is actually the emittance of light by any substance due to radiation. Hence, false.
45.
Yes, the image produced by a plane mirror is laterally inverted. Hence, true.
