Answer:
B. Slightly acidic
Explanation:
pH can be defined as a measure of the negative logarithmic concentration of hydrogen ion (H+) in an aqueous solution.
Basically, the pH scale is used to measure the level of acidity or basicity of an aqueous solution based on a scale of 0 to 14.
An acidic solution has a pH lower than 7 (0 - 6), a basic solution has a pH higher than 7 (7 - 14) and a neutral solution has a pH of exactly 7.
In this scenario, a student was assigned to take water samples from a lake near his home he measured the Ph of one of the water samples to be 6.0. Therefore, this sample of water can be said to be slightly acidic its pH is slightly below 7.
21.7 mol Rn =
Rn atoms
You have convert please help❤️
Answer:
130.68 × 10²³ atoms
Explanation:
Given data:
Number of moles of Rn = 21.7 mol
Number of atoms = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
21.7 mol × 6.022 × 10²³ atoms / 1mol
130.68 × 10²³ atoms
What is a simulation? Why are simulations helpful to scientists?
Answer:
A simulation is an imitation. Simulations are helpful to scientists because they allow scientists to study occurrences more closely.
Explanation:
Explanation:
A simulation is a way of imitating a process or change in the real world to predict what will happen or explain what did happen and why, these days simulations are often run on computer,scientists use simulations to answer questions see how complex system works test ideas and make predictions, hope it helps^^
btw I'm no expert, I did research^^
Identify the atomic number and atomic mass: Hydrogen: 1 proton, 0 neutrons, 1 electron
Answer:
Atomic Number: 1
Atomic Mass: 1
Explanation:
Atomic number = # of protons
Atomic mass = # of protons + # of neutrons
What is the most obvious sign of bias in a historical text?
A.
incorrect information and lack of reference sources
B.
strong language, expressing either like or dislike
C.
repetition of the same information over and over
D.
talking only about a single historical event
Answer:
the answer is b,the answer has to be even though I'm not very sure about it
Choose the mole ratio below that is INCORRECT based on the given balanced equation:
2 C2H5OH + 7 O2 --> 4 CO2 + 6 H2O
O 2 moles C2H5OH = 4 moles CO2
O 7 moles O2 = 2 moles C2H5OH
O 4 moles CO2 = 4 moles O2
O 6 moles H2O = 7 moles O2
Answer:
4 moles CO₂ = 4 moles O₂
Explanation:
The reaction equation is given as;
2C₂H₅OH + 7O₂ → 4CO₂ + 6H₂O
The incorrect mole ratio from the relationships shown is;
4 moles CO₂ = 4 moles O₂
Number of moles of CO₂ = 4
Number of moles of O₂ = 7
So, the right expression is;
4 moles CO₂ = 7 moles O₂
On a hot day, you sit on the edge of a pool and dip your feet into the water, causing changes to occur that are related to the physical and thermal properties of your feet and of the water. Select the statements that accurately describe what is happening, in terms of the heat and temperature of the objects and substances. There may be more than one accurate statement.
A.
Cold from the water reduces the temperature of your feet.
B.
Heat from your feet raises the temperature of the water.
C.
Your feet transfer heat into the surrounding water, reducing the temperature of your feet.
D.
Cold from the water moves into your warm feet.
Pwease halp, If a decrease in temperature accompanies a reaction, what occurred?
Energy was released.
Energy was destroyed.
Energy was created.
Energy was absorbed.
Answer: energy was released.
Explanation: i took the quiz.
When an atom is unstable, what will happen?
Answer: Unstable atoms will lose neutrons and protons as they attempt to become stable, atoms the binding energy is not strong enough to hold the nucleus together
Explanation:
What mass of citric acid (molar mass = 192.14g/mol) would be needed to make 0.10 L of 5.00 M citric acid solution ?
Answer:
Mass = 96.07 g
Explanation:
Given data:
Mass of citric acid = ?
Molar mass of citric acid = 192.14 g/mol
Volume of citric acid solution = 0.10 L
Molarity of solution = 5.00 M
Solution:
First of all we will calculate the number of moles from molarity formula. Then we will determine the mass from moles formula.
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
5.00 M = n/0.10 L
n = 5.00 mol/L× 0.10 L
n =0.5 mol
Mass of citric acid:
Number of moles = mass/molar mass
0.5 mol = mass/ 192.14 g/mol
Mass = 0.5 mol × 192.14 g/mol
Mass = 96.07 g
Some elements can make ions when what event occurs? Question 8 options: The gain of an electron The loss of a neutron The gain of a neutron The gain of a proton
Answer:
The gain of an electron.
Explanation:
Ions are made when an atom does no longer have an equal number of protons and electrons.
This would theoretically mean that in order for an atom to become an ion, it would have to either gain or lose an electron or a proton.
However, protons are located in the nucleus, so the energy required to add or remove a proton is immensely higher than the energy required to add or remove an electron.Write an explanation on how filtration works, using the words: soluble and unsoluble.
Answer:
If a substance does not dissolve in a solvent, we say that it is insoluble. For example, sand does not dissolve in water – it is insoluble.
Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered:
the sand stays behind in the filter paper (it becomes the residue)
the water passes through the filter paper (it becomes the filtrate)
The slideshow shows how filtration works
Explanation:
1st
A beaker containing a mixture of insoluble solid and liquid. There is filter paper in a filter funnel above another beaker.
2nd
The mixture of insoluble solid and liquid is poured into the filter funnel.
3rd
The liquid particles are small enough to pass through the filter paper as a filtrate. The solid particles are too large to pass through the filter paper and stay behind as a residue.
Answer:
Filtration is the action or process of filtering something. Filtration is the method used for separating an insoluble solid from a liquid. Ex - oil and water
I am really sorry but I don't know how to include the word solube!!!
A mixture is a combination of
I give Brainly
I need the answer now plz
two or more pure substances in
which each pure substance retains
its individual chemical properties.
A mixture is physically, not
chemically, combined.
Example: salt and sugar
combined together in a bowl
I need 2 more examples
Answer:
Sand and water
Oil and sand
Explanation:
A mixture, has rightly stated in this question, is a substance composed of two or more substances combined physically rather than chemically. In a mixture, each constituent retains its chemical properties i.e. the chemical properties of none of the substances in a mixture is altered. This serves as the basis for the physical separation of a mixture.
One example of mixture has been given in this question i.e salt and sugar combined together in a bowl. This represent a mixture because the sugar is not chemically combined to the salt, hence, each can easily be separated. This is the same for any other mixtire. More examples include:
Sand and water
Oil and sand
Salt and water (salt solution)
Petroleum or crude oil
What kind of energy makes your hair frizzy
Answer:
electricity
Explanation:
static hair occurs when your hair builds up an electric charge
Mass is a(n)
property.
O a. electrical
Oc. chemical
Ob. physical
O d. natural
Answer:
d. natural I think is the right answer
Explanation:
I think thats the right answer
formula for salt
I will mark u brain list
Answer:
The formula for salt is NaCl or Sodium chloride
What is the problem with a series circuit? *
A. They do not work
B. 1 goes out, they all go out
C. They are hard to create.
Answer:
I believe it is B
Explanation:
Given the unbalanced combustion equation: C3H8 + O2 → CO2 + H2O, how many moles of carbon dioxide are produced when 64.0 g of oxygen is reacted with excess propane?
Moles of Carbon dioxide : 1.2
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction(balanced)
C₃H₈ + 5O₂=> 3CO₂ + 4H₂O
mol of O₂ :
[tex]\tt \dfrac{64}{32}=2[/tex]
mol of CO₂ :
[tex]\tt \dfrac{3}{5}\times 2=1.2[/tex]
Molecules of a gas _____.
move slowly and are far apart
move fast and are far apart
move slowly and are close together
move fast and are close together
Answer:
Explanation:
Move fast and are far apart is the correct answer
wjat is 0.06m to cm
Answer:
6 cm
Explanation:
Which has a higher melting point KF or NaF
1. You are pushing a heavy shopping cart full of water bottles with a constant force. The shopping cart has
mass of 250 kg and it is accelerating down the aisle at 0.20 m/s? How much force are you exerting?
Answer:
F = 50 N
Explanation:
Given data:
Mass of car = 250 Kg
Acceleration of car = 0.20 m/s²
Force required = ?
Solution:
Formula:
F = m×a
F = applied force
m = mass
a = acceleration
Now we will put the values in formula.
F = 250 Kg × 0.20 m/s²
F = 50 Kg.m/s²
Kg.m/s² = N
F = 50 N
Please help me I need an answer ASAP
are the answers correct ?
Answer:
yeh they are all correct .
When Jeremy returned home after vacation, he noticed that his new plant had not grown. His mother, a florist, told him that it was because the plant was not getting enough sunlight. He moved his plant closer to the window to get more sunlight. How can Jeremy best support the idea that his plant needs more sunlight? Ask his mother to make the plant better. Wait and see what happens to the plant. Remove the plant from direct sunlight after a week. Ask his science teacher at school what she thinks could be the reason.
Answer:
Wait and see what happens to the plant.
Explanation:
The best course of action for Jeremy would be to wait and see what happens to the plant after moving it closer to the window to get more sunglight.
If the plant grows after observing it for some times, he can conclude that light has been a major hindrance to the growth and more sunlight would benefit the plant. If the observation is otherwise, then Jeremy can conclude that the lack of growth observed is not due to light.
Answer:
remove the plant from direct sunlight after a week
Explanation:
Please need the answers from 1/9 help me please
Answer:
1. Dune
2. Glaciers
3. Loess
4. Glacial drift
5. Glaciers deposit their sediment when they melt. They drop and leave behind whatever was once frozen in their ice. It's usually a mixture of particles and rocks of all sizes, called glacial till.
6. Large plants like shrubs and trees break the wind. Compare and contrast how wind and glaciers abrade rocks. Both move rock materials past each other. The materials moved by wind are very small, wheres they are glaciers they can abrade a large rock.
7. A mass movement can either be slow or rapid. The slow downward movement of materials in a slope is called creep. This happens when the soil loosens up because of water and burrowing animals. In contrast to this, the rapid movement of large materials in a slope is called landslide.
8. Check brain.ly
9. Check Slader
Explanation:
What is the Delta.Hf for this reaction? 16CO2(g) + 18H2O(g) Right arrow. 2C8H18(l) + 25O2(g)
Answer: The Hrxn for the reaction C(s) + O2(g) -> CO2(g) is the same as the Hf for CO2(g).
The Hf for Br2(l) is 0 kJ/mol by definition
The Hrxn for the reaction 1.5H2(g) + 0.5N2(g) -> NH3(g) is the same as the Hf for NH3(g).
Explanation:
Answer:
10,148
Explanation:
Air is a natural resource .
Ture
False
Which of the following refers to all of the organisms in a particular area?
O population
O ecosystem
O community
O organelles
On a hot day, Ava got herself a carbonated beverage. She knew from her science class that carbonated drinks had carbon dioxide in them.
She noticed that bubbles started to form and rise upwards only after she unscrewed the cap. She then opened another bottle that was much colder and she noticed fewer bubbles had formed. Explain what Ava observed. PLS ANSWER, I NEED HELP !!
Explanation:
Using a derivative of the combined gas law we can explain what is happening in both instances.
Assuming that the volume is constant which is predicated on the bottle shape and structure, the pressure of a given mass of gas varies directly with the absolute temperature.
As temperature increases, the pressure also increases and vice versa.
The first bottle at a higher temperature has a higher pressure of gas. The second bottle at a lesser temperature has a reduced pressure inside.Sound _____.
travels in transverse waves
requires a medium to travel through
travels most slowly through solids
speeds up when temperature is increased
is changed into electrical impulses by the cochlea
Answer:
Sounds travels in transverse waves requires a medium to travel through
Answer:
The answer is A
Explanation:
just got it correct on a quiz