Answer:
Flavors and fragrances
During which change of state would the volume of a substance increase the most?
O deposition
O melting
O vaporization
O sublimation
If potassium is a soft reactive metal at room temperature, name one other element you would expect to also be a soft reactive metal at room temperature? How do you know?
Explanation:
Lithium
Sodium
group one elements are highly reactive
Which best describes the geologic time scale? (choose the best answer from below)
It explains why events happen throughout Earth’s history.
It presents the correct sequence of events in Earth’s history.
It is used to determine the absolute dates in years for different periods.
It was created by scientists who studied index fossils and climate change.
Answer: B) It presents the correct sequence of events in Earth’s history.
Explanation: edge 2021
2. Which element below would be the best choice when creating a covalent molecule with an
Oxygen atom?
A. Na
B. Mg
C. Ne
D. O
Answer:
The chemical elements most likely to form covalent bonds are those that share electrons, such as carbon, as opposed to those that take them from another element to form an ionic bond. In general, they are nonmetals with similar electronegativities.
Explanation:
Answer:a
Explanation:
Pls answer ill give brainliest question in pic
C is the correct answer
Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature increases in altitude within the stratosphere because of the ozone layer.
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Please remember to revise this and make it in your own words if you want! I hope this helps you. -Doodle
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How many moles of water are produced if 5.43 mol PbO2 are consumed
Answer:
Then it can be easily concluded that 10.86 moles of water will be produced.
Answer:
10.9
Explanation:
trust i js did the assignment
If Beryllium were to lose a proton, it would become a(n)
Answer:
an anion
Explanation:
since it lost a proton..it now has 3 protons and four electrons and possesses a minus charge since it is no longer neutrally charged..this minus charge makes it an anion
2. Give a "water-wise" alternative to each
activity below.
(a) hosing off a driveway to
clean it
(b) watering outdoor plants with a hose
(c) letting the tap run to get cold water
i’m feeling good today you’ll get 30 points for the questions
Answer:
1. sweep it instead
2.use a wateringcan with a percise nossole to water your plants efectivly 3.keep a jug of water in your frisge
Explanation:
(reply with the answer or get reported) Please help and thanks
PLEASE HELP!
mass number - atomic number =
Answer:
Number of neutrons
Explanation:
The mass number represents the number of protons and neutrons combined and the atomic number only represents the number of protons.
mass number - atomic number = number of neutrons
Answer:
mass number - atomic number = number of neutrons
Explanation:
The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. The mass number minus the atomic number represent the number of neutrons.
For the reaction, Cl2 + 2KBr --> 2KCl + Br2, how many moles of potassium chloride, KCl, are produced from 102g of potassium bromide, KBr (MM: 119.002 g/mol)?(answer has 3 decimal places)
Solution :
From the balanced chemical equation, we can say that 1 moles of KBr will produce 1 moles of KCl .
Moles of KBr in 102 g of potassium bromide.
n = 102/119.002
n = 0.86 mole.
So, number of miles of KCl produced are also 0.86 mole.
Mass of KCl produced :
[tex]m = 0.86 \times Molar \ mass \ of \ KCl\\\\m = 0.86 \times 74.5 \ gram \\\\m = 64.07\ gram[/tex]
Hence, this is the required solution.
how many molecules are in 3cacl2
Answer:
The molar mass and molecular weight of 3CaCl2 is 332.952.
If the half-life of substance Z is 2.5 years, how long would it
take for 48 grams of substance Z to decay such that only 3
grams remain?
It takes 10 years for the substance z to decay from 48g to 3g
Half life of z = 2.5 years
Final amount of Z = 3 g
Initial amount of Z = 48 g
According to the question, it takes 2.5 years for substance Z to reduce to half.
So,
In 2.5 years, the amount of z = 48/2 = 24 grams
In next 2.5 years, the amount of z = 24/2=12g
In next 2.5 years, the amount of z = 12/2=6g
In next 2.5 years, the amount of z = 6/2=3g
To reduce the amount from 48g to 3g, total years = 2.5 + 2.5 + 2.5 + 2.5
= 10 years
Therefore, it takes 10 years for the substance z to decay from 48g to 3g
a. For the reaction 2H2 + 02→ 2H20, how many moles of water can be produced from 6.0 mol of oxygen? 2.0 mol b. 6.0 mol 12 mol d. 18 mol
Explanation:
from the equation 1 mole of O2 will give 2 moles of H2O then 6.0 moles of O2 will give x
6.0*2 moles/ 1 mole
= 12 moles
this implies that, 6.0 moles of O2 will give = 12 moles of water
what is a reaction that uses a catalyst?
One of the most commonly known catalysed reaction is that of Hydrogen Peroxide turning into Water
In this reaction, we can use Potassium Permanganate (KMnO₄) or Palladium (Pd) as a catalyst.
These catalysts helps Hydrogen Peroxide turn into water and oxygen
Catalyst: Substances that change the rate of a chemical reaction and themselves remain chemically unchanged after the reaction are called catalysts.
Example:- In the process of manufacturing of ammonia Fe is used as Catalyst.
[tex]N _{2} (g)+ 3H _{2} (g) \huge \rightarrow {}^{Fe}\rightarrow \small{3NH _{3}(g)}[/tex]
Note:- there is only one arrow. I was unable to put iron over the arrow ..
Hope This Helps You ❤️You have learned how to take steps that are exactly 1m long. You take 12 steps north, then 15 steps north, 35 steps south, 11 steps south, then 16 steps north. What distance have you walked? What is your total displacement?
Answer:
you have walked 69 steps but your current location is -13
the food we eat can be classified into three groups called
Calculate the number of atoms in 13.2 mole copper
In the given question, [tex]7.949 \times 10^{24}[/tex] atoms are present in 13.2 mole of copper.
A mole is defined as the amount of a substance that contains exactly [tex]6.022\times 10^{23}[/tex] 'elementary entities' of the given substance.
The number of atoms in 13.2 moles of copper (Cu) can be calculated using Avogadro's number.
To calculate the number of atoms in 13.2 moles of copper, we can multiply the number of moles by Avogadro's number:
Number of atoms = [tex]\rm 13.2\ moles\ \times[/tex] [tex]6.022\times 10^{23}[/tex] atoms/mole
Number of atoms = [tex]7.949 \times 10^{24}[/tex] atoms
Therefore, in 13.2 moles of copper, there are approximately [tex]7.949 \times 10^{24}[/tex] atoms.
Learn more about Mole here:
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Which of the following reactions is balanced?
A)
Sn2+ + 2Fe3+ → Sn4+ + 2Fe2+
B)
Sn2+ + 2Fe3+ → Sn4+ + Fe2+
C)
Sn2+ + Fe3+ → Sn4+ + Fe2+
D)
2Sn2+ + Fe3+ → 2Sn4+ + Fe2+
Answer:
A
Sn2+ + 2Fe3+ > Sn4+ + Fe2+
A déliquescent salt of a divalent metal
Answer:
CaCl2
Explanation:
In which direction does the electric field point a position directly south of a positive charge?
Answer: Outward
Explanation: :The direction of electric field is radially outward for a positive charge and radially inward for a negative charge. Thus, for the electric field points toward south at a position directly south of a positive charge.
Hydrogen peroxide (H2O2) decomposes into water (H2O) and oxygen gas (O2). Hydrogen peroxide is a liquid that is stored in dark-colored bottles in a cool location. Which of these is the MOST likely reason for storing hydrogen peroxide in
this way?
A. Hydrogen peroxide forms crystals when warmed.
B. Exposure to light allows bacteria to grow in hydrogen peroxide.
C. Exposure to light promotes the formation of hydrogen gas (H2) instead of oxygen gas.
D. Hydrogen peroxide breaks down quickly when exposed to light.
Answer:
D
Explanation:
the H2O2 under go reduction to remove O2 and then forms water
A. Acid rainfall will cause a decrease in oceanic surface temperatures.
O B. Increased atmospheric carbon dioxide will cause increased ocean surface temperatures.
O C. Any measurable increase in ocean surface temperatures must be caused by human activites.
OD. Saturation of nitrogen in the atmosphere will cause a wide range of ocean surface temperatures.
(PLEASE HELP ME)
Answer:
Increased atmospheric carbon dioxide will cause increased ocean surface temperatures.
Explanation:
Greenhouse gases of which CO2 is a typical example are known to cause a gradual and steady increase in the surface temperature of the earth by trapping infrared rays close to the surface of the earth.
As the surface temperature of the earth rises, the surface temperature of the oceans rises also leading to the tendency towards hurricanes.
Hurricanes are violent storms which are known to form near the equator over warm ocean waters.
Hence, increased atmospheric carbon dioxide will cause increased ocean surface temperature which in turn increases the chances of the occurrence of hurricanes.
The table shows data from an experiment designed to find a solution that is both an acid and a strong electrolyte. Based on the data, which solution is the best acidic electrolyte.
Solution 1, 2, 3, or 4? Thank you!!!
Answer:
Solution 4 is the best acidic electrolyte
Explanation:
An acidic medium such as a solution has a pH that is less than 7. The acidity of the medium increases with decrease in the pH value. Acidic solutions turn blue litmus solution red. They produce hydrogen ions as positive ions solution as well as a negatively-charged ion.
An electrolyte is a solution which allows electric current to pass through it and in the process is decomposed by the electric current. Electrolytes are able to allow current flow through them because they are composed of negatively and positively-charged molecules known as ions which are responsible for carrying electrical charges. A good electrolyte will be a solution which conducts electricity freely.
Based on the data in the table, the solution that is both acidic and has high electrical conductivity is solution 4. Solution 4 turns blue litmus solution red indicating that it is acidic. Also, it has a low pH of 2.0 indicating that it is very strongly acidic.
Therefore, solution 4 is the correct option.
i need helpppppppp!!!!!
Answer:
Sorry I want to help but I dont know the answer
63) How many moles of CaBr
2
are in 5.0 grams of CaBr
2
2.
4.0 x 101 mol
2.5 x 10-2 mol
4.2 x 10-2 mol
1.0 x 10'mol
Answer:
I think it will be the answer
2.5 x 10-2 mol
I hope it help you
Is there any evidence that the particles in a solid and liquid move? Provide examples.
Answer:
maybe not solid but a liquid yes
Answer:
yes
Explanation:
the molecules move
9. What is the total number of grams of NaOH (formula mass = 40.) needed to make 1.0 liter of a 0.20 M solution?
(1) 20. g (2) 2.0 g (3) 80. g (4) 8.0 g
Answer:
8 gram
Explanation:
in case of NaOH, normality=molarity
so normality=molarity×acidity or basicity(in case of NaOH it's 1)
then
weight of NaOH required = volume in ml × equivalent weight × normality / 1000
so
1000× 40× 0.2/1000
=8 gram
The total mass of sodium hydroxide (NaOH) needed to make the solution is 8 g (Option 4)
How to determine the mole of NaOH Volume = 1 L Molarity = 0.2 MMole of NaOH =?Molarity = mole / Volume
0.2 = mole of NaOH / 1
Mole of NaOH = 0.2 mole
How to determine the mass of NaOH Mole of NaOH = 0.2 mole Molar mass of NaOH = 40 g/mol Mass of NaOH =?Mass = mole × molar mass
Mass of NaOH = 0.2 × 40
Mass of NaOH = 8 g
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How many grams of manganese (III) iodide (Mn13) will be needed to make 1.3 grams of hydrogen iodide (HI)? g MnI3
Answer:
I dont know
Explanation:
I need it to
11. In the diagram below, what will allow more solute to be dissolved in the
solvent?