Answer:
4.5 times 10 = 45
Explanation:
"Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."
Vinegar and milk forming solid clumps of solid (curds) is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answer:
Formation of precipitate
Answer:
all of them are correct on EDGE
Explanation:
i just took the assignment
Which of the following pairs of elements would most likely combine to form a salt?
Ne and F
Ca and Cs
C And cl
Mg and cl
help help help help help help help help help help please!!! worth 20 points please helppppp!!!!
Explanation:
here
Al is 2
so is 6
and more you can do it
which was an important part of dalton's atomic model
In a lava lamp, a waxy substance rises and falls repeatedly. What causes the waxy substance to rise? Check all that apply. The waxy substance is cold. The waxy substance is warm. The waxy substance is less dense than the surrounding liquid. The waxy substance is more dense than the surrounding liquid. Convection is occurring.
Answer:
The waxy substance is warm.
The waxy substance is less dense than the surrounding liquid.
Convection is occurring.
Explanation:
Convection involves heat transfer by the actual movement of the particles of a substance.
When the wax is heated, the waxy substance becomes warm and rises in the lamp. The warm waxy substance is less dense than the surrounding liquid, this process of rising and falling is as a result of convection occurring in the lava lamp.
Answer:
The person above (or below) me is correct, the answer is:
B.) The waxy substance is warm.
C.) The waxy substance is less dense than the surrounding liquid.
E.) Convection is occurring.
Explanation:
I did the assignment on Edge, 2022.
(See the attachment below.)
Hope this helped, good luck on your quiz! <3
What are some different types of stimuli?
Answer:
Mechanical, thermal,chemical
Explanation:
Answer:
chemical, temperature, pressure, and light
Explanation:
What are the products in a chemical reaction?
A. The chemical formula of the substances
B. The new substances that are produced
C. The substances that interact
D. What is left over after the reaction
Which term refers to the sum of the kinetic energy of all the particles in an object?A.Potential energyB.Thermal energyC.TemperatureD.Heat
plzz hurry
Answer:
It’s the other answer, thermal energy
Explanation:
I hope y’all get a good grade
Thermal energy refers to the sum of the kinetic energy of all the particles in an object. Hence, the correct option is B.
Thermal energy is a form of internal energy associated with the random motion and vibrations of atoms and molecules within a substance. It is directly related to the temperature of the object, as the temperature is a measure of the average kinetic energy of the particles. The higher the temperature, the greater the thermal energy of the object.
Potential energy (A) refers to the energy that an object possesses due to its position or state, such as gravitational potential energy or elastic potential energy.
Temperature (C) is a measure of the average kinetic energy of the particles in a substance and is not the sum of the kinetic energy of all the particles. However, it is related to thermal energy as it provides information about the average kinetic energy.
Heat (D) refers to the transfer of thermal energy from one object to another due to a temperature difference. It is not the sum of the kinetic energy of the particles in an object but rather the energy transfer between objects with different temperatures.
Learn more about Thermal energy from the link given below.
https://brainly.com/question/3022807
#SPJ2
what two subatomic particles have to be different in order to have an ion?
A)Protons and electrons
B)Protons and neutrons
C)Neutrons and electrons
Answer:
A)Protons and electrons
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
when an atom lose or gain the electron ions are formed and number of protons and electrons no longer remain the same.
For example:
An atom of sodium when lose one electron it form positive ion. The number of electrons became 10 and number of protons remain 11.
Na → Na⁺ + 1e⁻
Help!!
What shape would SeH2 have? Draw the molecule.
Also, if you are good with this kind of thing, please answer my other questions too!
Copper sulfate, when it is dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the steel wool disappears, a brownish solid forms, and the color of the solution changes from blue to green.
Choose one answer that gives the best evidence that a chemical reaction took place.
A. The color change from blue to green happens in nature.
B. The disappearance of the steel wool shows that a new substance has formed.
C. The solid precipitate is a waste product in the reaction.
D. Energy is lost in this reaction like all other reactions.
Which answer did you choose? Explain your reasoning.
Answer:
A. The color change from blue to green happens in nature.
Explanation:
The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.
In this reaction, color changes is quite an effective tool Chemical changes usually involves the formation of a new product from the chemical reaction. Also, the steps are not easily reversible.For this reaction, color change is the most appropriate signal for a chemical change.The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.
Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.
Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
Learn more: https://brainly.com/question/8646601
When a drawing of a circle made in the center of a piece of paper with a black marker gets wet, the marker bleeds, and as the water moves through the paper the ink separates into several colors.
What method of separation does this describe?
evaporation
distillation
filtration
chromatography
Answer:
D) Chromatography
Explanation:
Answer: It is D. chromatography.
Step-by-step explanation:
when water or dye passes through a medium and changes color then that means it must be chromatography.
____causes movement of an object,whereas____is the work done ✔️ on an object in given amount of time
Answer:
the first answer is force and the second one is power
Explanation:
Force is what causes movement
Answer:
force & power
Explanation:
SCIENCEEEE!!!! HELPPPPP MEEEE OUTTTT!!!!
The following reaction is a
reaction.
Answer:
??
Explanation:
How many significant figures are in the number 4.02 x 10^-9 ?
Answer:
3 sig figs
Explanation:
True or False:
C + 02 - CO2
In the chemical reaction above, the coefficient of oxygen is 2.
False
True
Check it
skip
Answer:
true the coefficient of oxygen is 2
Answer:
Explanation:
True
This app is for helping people so please help me with these 2 questions
Answer:
1. The organism becomes ill or may die.
2. Pathogens.
Explanation:
(1) When an organism fails to maintain homeostasis, the organism typically becomes ill, and they will die if homeostasis cannot be re-achieved.
(2) A pathogen is a virus that can cause diseases.
Can someone help me pls
two hydrogens atoms and one oxygen atom together are?
Answer:
h20 water is the answer
Imagine you have a radioactive sample containing both virtualium and decayed atoms of virtualium. After analysis you find it contains 10 atoms of virtualium and 40 decayed atoms . How old is your sample? Hint you must use the half life of virtualium determined earlier. BTW the half life of virtualium is 12
Answer:
COULD WE PLEASE GET THIS ANSWER?????
Explanation:
What 2 things define the state of matter?
Answer: gas are well separated with no regular arrangement.
liquid are close together with no regular arrangement.
solid are tightly packed, usually in a regular pattern.
its just gas liquid and solid pls make me brainliest
Explanation:
0.50g of a volatile liquid was introduced
into a globe sf 1000ml capacity. The globe
was heated to 91°C, so that all the liquid
vapourised exerted
a pressure of 190 mmHg.
Calculate the molecular mass of the lliquid.
Answer:
59.52g/mol
Explanation:
This question can be answered using the formula;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latm/molK)
T = temperature (K)
From the information provided:
P = 190mmHg = 190/760 = 0.25atm
V = 1000ml = 1000/1000 = 1L
n = number of moles = ?
T = 91°C = 91 + 273.15 = 364.15K
PV = nRT
0.25 × 1 = n × 0.0821 × 364.15
0.25 = 29.8967n
n = 0.25/29.8967
n = 0.0084mol
Mole = mass/molar mass
Molar mass = mass/mole
Molar mass = 0.50/0.0084
Molar mass = 59.5238
Hence, the molecular mass of the liquid is 59.52g/mol
If the concentration of Sn2+ in the cathode compartment is 1.10 M and the cell generates an emf of 0.22 V , what is the concentration of Pb2+ in the anode compartment?
Answer:
[Pb] = 1.1*10^-8
Explanation:
The Eo values of the half cell reaction of the following are
Pb2+ + 2e- ==> Pb . . .Eo = -0.13 V
Sn2+ + 2e- ==> Sn . . .Eo = -0.14 V
Sn+2 is at cathode(reduction)compartment and Pb+2 is at anode(oxidation) compartment.
the overall reaction will be
Pb ==> Pb2+ + 2e- (oxidation) Eo = +0.13 V
Sn2+ + 2e- ==> Sn (reduction) Eo = -0.14 V
----------------------------------------------------------------------
Pb + Sn2+ ==> Pb2+ + Sn Eo cell = -0.01 V
Qcell = [Pb+2] / [Sn+2] ( pure Sn , Pb do not appear in Q
Ecell = Eo -0.059/n* logQ
0.22 = -0.0.1 - 0.059/2 logQ
0.23 = -0.0295logQ
LogQ= -7.796
Q = 10^-7.796≈ 1/10^8
[Pb+2] / [Sn+2] = 1/10^8
[Pb] = 1.1*10^-8
GUYS I NEED HELP WITH THIS ASSIGNMENT MY LAST ASSIGNMENT FOR THE DAY
1. What are the reactants? What are the products? Use the reaction below (2pts)
Na + Cl2 → NaCl
2. Why do chemical reactions need to be balanced? (2pt)
3. In order to balance the following reaction, I need to add more Chlorine atoms to the product side. Would the highlighted answer be a correct way of adding more Chlorine atoms? Why or why not? (2pt)
Balanced: Na + Cl2 → NaCl2
4. Given the following reactions, what does the coefficient 2 represent for 2KI? (2pt)
Cl2 + 2 KI → 2 KCl + I2
Answer:
the reactants are na and cl2 the products is the combination nacl --the law of conservation of matter keeps reactions balanced. No you would not be adding more atoms that is what the first combo is. The coefficient 2 stands for 2 atoms of KL
Explanation:
BRAINLIEST IF RIGHT
A group of students observe their teacher modeling how a river carries sediments downstream to eventually create a delta. Which of the following scientific questions can best be answered by this model?
A.
What is the cause and effect relationship between weathering and cementation?
B.
How does chemical weathering of rocks in a river create a delta?
C.
What is the cause and effect relationship between erosion and deposition?
D.
How does a river weather rocks into sediments?
Answer:
C What is the cause and effect relationship between erosion and deposition?
Explanation:
i hope this help
A group of students conducted an experiment to find out what happens to the force of magnetism between two magnets as the distance between them increases. They used the equipment you see in the illustration. They
placed spacers between the magnet in the cup and the magnet on the post to increase the distance between them. They used washers as units to measure how much force it took to pull the two magnets apart.
Answer:
40
Explanation:
Porque yo creo que asi ) :
50mL of ethanol (density=0.79 g/mL) is dissolved by 400 mL of water. What is the concentration of ethanol in this solution?
The concentration of ethanol in this solution : 2.14 M
Further explanationMolarity is a way to express the density of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\tt \large{\boxed{\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
Ethanol(C₂H₅OH) MW =46,06844 g/mol[
mass of solute (Ethanol)[tex]\tt 50\times 0.79=39.5~g[/tex]
mol of Ethanol[tex]\tt \dfrac{39.5}{46.06844}=0.8574[/tex]
molarity[tex]\tt \dfrac{0.8574}{0.4}=2.14~M[/tex]
The moon has less gravity than we have here on Earth TRUE OR FALSE
Explanation:
obviously true the gravity of moon is 1/6th of the Earth
What happens to rock during subduction please help I will give you Brainlyest
Answer: Here is the answer!! :)
Explanation:
A subduction zone is a region of the earth's crust where one tectonic plate moves under another tectonic plate; oceanic crust gets recycled back into the mantle and continental crust gets created by the formation of arc magmas. ... This water lowers the melting point of mantle rock, initiating melting.
Here is a graph to understand it better!:)