Answer:
The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.
hope this helps
Explanation:
Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
How many molecules are in 25.3g of C2H4O
Answer:
0.57 molecules
Explanation:
QUESTION 2
What is the pressure in atm of 0.742 mole of gas at 10.91 L and 291 K?
I
The pressure of this gas in atm is equal to 1.63 atm.
Given the following data:
Number of moles = 0.742 moleVolume = 10.91 LitersTemperature = 291 KIdeal gas constant, R = 0.0821 Latm/molKTo calculate the pressure of this gas, we would use the ideal gas law equation;
[tex]P=\frac{nRT}{V}[/tex]
Where;
P is the pressure.V is the volume.n is the number of moles of a gas.R is the ideal gas constant.T is the temperature.Substituting the given parameters into the formula, we have;
[tex]P=\frac{0.742 \times 0.0821 \times 291}{10.91} \\\\P = \frac{17.73}{10.91}[/tex]
Pressure, P = 1.63 atm.
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plz answer properly i need mt grades to be up
Answer: 7
Explanation:
the factor that governs the formula of an ionic compound such as ca3n2 is
Answer:
the charge or oxidation number on the cation and anion.
Explanation:
The factor that governs the formula of an ionic compound such as Ca3N2 is the charge or oxidation number on the cation and anion.
In the example, Ca has a +2 charge, N has a -3 charge
So we need 3 x ( +2) to balance 2 x (-3) and have an electrically neutral compound, so
+6 -6 =0
The factor that governs the formula of an ionic compound such as Ca₃N₂ is charge.
What are ionic compounds?Those compounds in which ionic bond is present between the cation and anion is known as ionic compound.
The most important factor that is essential for the formation of ionic compounds are charge i.e. positive charge and negative charge. In the given compound Ca₃N₂, Calcium (Ca) is present in the +2 oxidation state and Nitrogen is present in the -3 oxidation state. So due to attraction between these charges they make a ionic compound.
Hence charge is important factor.
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If 77.0 mL of nitrogen gas is collected over water at 50 °C and 763 mm Hg, what is the volume of dry nitrogen gas at STP? The vapor pressure of water at 50 °C is 92.5mm Hg.
The volume of the dry nitrogen gas at STP is 57.4 mL
From the question given above, the following data were obtained:
Initial volume (V₁) = 77 mL
Initial temperature (T₁) = 50 °C = 50 + 273 = 323 K
Initial pressure (P₁) = 763 – 92.5 = 670.5 mmHg
Final temperature (T₂) = STP = 273 K
Final pressure (P₂) = 760 mmHg
Final volume (V₂) =?The volume of the dry nitrogen can be obtained by using the combine gas equation as follow:
[tex] \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\ \\ \frac{670.5 \times 77}{323} = \frac{760 \times V_2}{273} \\ \\ cross \: multiply \\ \\ 323 \times 760 \times V_2 = 670.5 \times 77 \times 273 \\ \\ divide \: both \: side \: by \: 323 \times 760 \\ \\ V_2 = \: \frac{670.5 \times 77 \times 273 }{323 \times 760} \\ \\ V_2 = 57.4 \: ml[/tex]
Therefore, the volume of the dry nitrogen gas is 57.4 mL
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Melting point of 20 g of ice
Answer:
6680 J
Explanation:
LOTS OF POINTS Which statement about Fe is supported by the modern atomic theory but no John Dalton’s theory? Look at the pic provided for choices.
Answer:
https://brainly.com/question/19533453
Explanation:
This might be able to help you.
does apple pie need to be stored in the refrigerator?
Answer:
yes/no
Explanation:
I prefere it refrigerated because it lasts longer in my opinion. but some people keep it out
Answer:
yes.
Explanation:
It does unless you want warm soggy pie.
Which statement is correct about the changes in fauna’s during one of these five major events
Answer:
source Mass extinctions are episodes in which a large number of plant and animal species become extinct within a relatively short period of geologic time—from possibly a few thousand to a few million years. ... Permian Period — 252 million years ago. Devonian Period — 359 million years ago. Ordovician Period — 443 million years
BP: Nowadays, scientists are aware of five mass extinction events in the past, starting with the End-Ordovician Extinction 450 million years ago and up to the End-Cretaceous Extinction that killed off the dinosaurs 66 million years ago
In your own words- Mass extinctions area unit episodes during which an oversized variety of plant and animal species become extinct at intervals a comparatively short amount of earth science time—from probably some thousand to some million years. ... Permian period — 252 million years past. period — 359 million years past. geological period — 443 million years
BP: today, scientists area unit alert to 5 mass extinction events within the past, beginning with the End-Ordovician Extinction 450 million years past and up to the End-Cretaceous Extinction that killed off the dinosaurs sixty six million years past
Explanation:
source is where i got this information and the in your own words is it fully rewritten hope this helps and my aplogies for making this so lengthy!
Why do some experiments blow up?
Answer:
because of chemical reactions
Answer:
gases expand rapidly because their particles move at high speeds in all directions
How much heat is absorbed when 25 g of water increases by 45 K?
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the water sample, in grams.[tex]c[/tex] - Specific heat of water, in joules per kilogram-Kelvin.[tex]\Delta T[/tex] - Temperature change, in Kelvin.If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:
[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]
[tex]Q = 4709.25\,J[/tex]
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
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the distance between two successive peaks is called
Can anyone please answer questions 3 and 4
I’ll give the brainiest!
Answer:
1.Phenolphthalein
2.Method
a.Use the pipette and pipette filler to add 25 cm 3 of alkali to a clean conical flask.
b.Add a few drops of indicator and put the conical flask on a white tile.
c.Fill the burette with acid and note the starting volume.
d.Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
Explanation:
. Nếu dẫn 0,01 mol CO2 vào 50 ml dung dịch Ba(OH)2 0,1M thì sau phản ứng thuđược
A. BaCO3
B. Ba(HCO3)2
C. BaCO3 vàBa(HCO3)2
D. BaCO3 vàBa(OH)2
Que pasa si a una taza de arena le pongo espuma y lo agito por 10 minutos?
Answer:
Conversion of energy
Explanation:
Shaking the sand is a form of kinetic energy. The friction of the sand particles rubbing against each other converts the kinetic energy to heat energy. Some of the kinetic energy also converts into the energy of sound waves, which you can hear while you shake the sand.
in what area of the united states do the fewest people live
Answer:
The most populous state in the United States is California, which has 37,253,956 inhabitants. On the other hand, the least populated state is Wyoming with 493,782 inhabitants.
Answer: Alaska. Alaska is by far the least densely populated of the US states and has 1.3 persons per square mile.
Explanation:
Hope it helped .
If you have a 100g of Boron and you want to find out how
many molecules of Boron you have, you would need to...
Answer:
5.57 x 10^24 atoms
Explanation:
first, you are seeking the number of ATOMS of Boron.
Boron has an Atomic mass of 10.8 g/mol (see #5 on the periodic table)
100 gm of Boron would have 100 g /10.8 g/mol =9.26 moles
each mole has Avogadros number of atoms 6.02 x 10^23
9.26 moles has 9.26 x 6.02 x 10^23 atoms =5.57 x 10^24 atoms
Define the mass number of an atom
Answer:
The mass number of an atom, which is also called the atomic mass number, is the total number of protons and neutrons in an atom,
Explanation:
Hope this is helpful.
Which statement did Kepler’s investigations of the movement of the planets explain?
Gravity acts on all objects in the universe.
Jupiter has more moons than earth.
Earth is not the center of the universe.
The sun is more massive than earth.
Which of the following is considered quantitative data?
A. Appearance
B. Smell
C. Temperature
Answer:
Temperature
Explanation:
This is because quantitative data include numerical values for example 10 degrees Celsius. However the others are qualitative data because the research can be described but not with numbers like your appearance is very nice.
Hope this helps :P
Answer:
Quantitative data is the type of data whose value is measured in the form of numbers or counts, with a unique numerical value associated with each data set. Also known as numerical data, quantitative data further describes numeric variables (e.g. How many? How often? How much?)
Explanation:
so its temp
Does light travel faster than sound?
Answer:
and id say maybe
Explanation:
Light waves travel much faster than sound waves.
What is the correct term for plants releasing water from their leaves which then evaporates?
A.precipitation
B.transpiration
C.condensation
Answer:
Transpiration is the correct answer mark me brainliest
What part of the digestive tract that the food is broken into very small pieces?
mix the food with digestive juices that have acids and enzymes, breaking it into much smaller, digestible pieces
hope it helpsHow many atoms of nitrogen are in 1.5 moles of aspartame?
Answer:
459.11 g.
Explanation:
hope this helps
Please help me no links
if good answer you get brainliest
Answer:
plutonic rocks are formed when magma cools and solidifies underground This shows us if the rock is plutonic or volcanic. When magma cools underground, it cools super slow and when lava cools above ground, it cools faster. When magma and lava cool, mineral crystals start to form in the molten rock.
Explanation:
i hope this is correct
How many moles are present in 1.39 grams of carbon?
C
R. F. M (Relative Formula Mass) of C=12
12g of C=1 mole
1.39g of C=(1*1.39)/12
=0.1158 moles
make short notes on all the form of energy
Answer:
The forms of energy are:
Radiant energyMechanical energyThermal energyNuclear energyElectrical energyChemical energyThese are the six forms hope you can write short notes on them.
The positvie part of the atom found in the center of the atom
Write and balance chemical reactions for the following reactions and name the reaction type:
a. Solid sodium oxide reacts with water to form sodium hydroxide
b. Solid aluminum metal reacts with aqueous zinc chloride.
c. C3H8 (g) + O2 (g) --->
2. Describe the three main types of radioactive decay and their properties.
Answer: The reaction of 1 mol of C to form carbon monoxide in the reaction 2 C(s) + O2(g) ( 2 CO(g) releases 113 kJ of heat. How much heat will be released by the combustion of 100 g of C according the the above information? According to the balanced chemical equation;
Explanation:
Explain why ions have a charge on them.
Answer:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.