Answer:
A. Potassium (K)
Explanation:
The trend of atomic radius goes:
As group number increases, radius decreases
As period number increases, radius increases
Answer:
francium
Explanation:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
How many grams of hydrogen (H2) form in this reaction, according to this balanced equation?
2A1. + 6HCl -> 2AlCl3 + 3h2
53.96 g 218.76 g 266.66 g ?
A. 101.86 grams
B. 6.06 grams
C. 2.02 grams
D. 539.38 grams
Answer:
B = 6.06 g
Explanation:
Chemical equation:
2Al + 6HCl → 2AlCl₃ + 3H₂
In given balance chemical equation there are 3 moles of hydrogen are formed.
Mass of hydrogen in gram:
Formula:
Number of moles = mass/molar mass
Mass = number of moles × molar mass
Molar mass of hydrogen = 1.008×2 = 2.016 g/mol
Mass = 2.016 g/mol× 3 mol
Mass = 6.05 g
It is almost equal to 6.06 g thus option B is correct.
Answer: 6.06
Explanation:
pleaseeee helpp its a HW question
will mark brainliest!!
A solid is that form of matter that possesses the following characteristics??
is 8 hcl and 2 h2 products, consumers or reactants
Answer:
8 hcl and h2 is reactants.
In general, how many valence electrons do transition metals have? (Valence are highest n, only s and p sublevel)
What ion is likely to form with transition metals? Speculate as to why you think some transition metals can form multiple ions?
Answer:
2 valence electrons.
Explanation:
Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is
n
s
2
(
n
−
1
)
d
, so those
n
s
2
electrons are the valence electrons
can someone go answer my qeastion please this is what it looks like
Answer:
C
Explanation: i hope this helps plz tell me if its wrong so i can fix it :)
how do you figure out which metals have a density greater than another metal?
ex:
chromium has a density of 7.2g/cm3. which two of the given metals in the table have a density greater than that of chromium?
table:
•aluminum: 10(volume): 27(mass)
•copper: 2.0(volume): 18(mass)
•iron: 2.0(volume): 16(mass)
•titanium: 10(volume): 45(mass)
•vanadium: 2.0(volume): 12(mass)
Answer:
Density = Mass/Volume
Explanation:
For the example the answers are Copper and Iron
In the case of chromium having a density of 7.2, anything greater than 7.2 is a higher density. 18/2=9 and 16/2=8. The copper and iron metals were the only ones that had a higher output than the density of chromium.
Which type is a metamorphic rock formed from shale?
Answer:
Slate
Slate is a foliated metamorphic rock that is formed through the metamorphism of shale. It is a low-grade metamorphic rock that splits into thin pieces.Explanation:
hi pargol hehscshHsshsvbssjksgsgsbssjgdbsnshed
Answer:
Hola
Explanation:
proton is not affected by a magnet true or false
Answer:
true
Explanation:
negatively charged electrons are affected by the magnetic field.
Answer:
false
Explanation:
It isn't affected because nothing makes it change and the number stays the same
Which element is the most reactive?
sodium
nickel
carbon
oxygen
Answer:
Sodium.Hope this helps please consider marking brainliest!!
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.
How many atoms are in a sample of 0.585 moles of krypton (Kr)?
Answer:There are 1.51 × 1024 atoms
Explanation:
What substance makes lemon juice vinegar and soda
Answer:
Sodium bicarbonate or baking soda
Explanation:
What do you think will happen to the speed of the molecules if a gas is heated?
Imagine a campfire on a cold day. At first, the temperature of each log is as cold as the air around it. A few hours after the fire has burned out, the temperature of the ashes will also be cold. But in between, when the fire is burning, the temperature of the logs and surrounding air is very hot. What is the source of this thermal energy? For the answer, begin by identifying the reactants and products for the overall chemical reaction of burning wood. Wood is mostly carbohydrates, the bulk of which is cellulose. Cellulose is made up of hundreds to thousands of glucose groups connectected by oxygen molecules. The chemical formula for cellulose is (C6H12O6)n, where n is the number of glucose groups. For more manageable models, carbohydrates will be modelled as glucose with a chemical formula of C6H12O6.
Answer:
See explanation
Explanation:
From the statement of the first law of thermodynamics, energy is neither created nor destroyed, but is transformed from one form to another.
Thermal energy is possessed by the hot air while the fire is burning. This thermal energy was obtained from the chemical energy stored in carbohydrates(cellulose) that is present in wood material. As the combustion proceeds, chemical energy stored in chemical bonds of the wood material converts into thermal energy (heat energy). The chemical reaction involved in the combustion of wood can be simplified as shown below; n represents the number of glucose units that combine to make up the cellulose present in the wood material.
nC6H12O6(s) + 6nO2(g) ===> 6nCO2(g) + 6nH2O(g)
n may even be as much as thousands of glucose units.
3. If the distance between two ions of the same charge is increased, what will happen to the energy of interaction between the ions? Why?
Answer:
The electrostatic attraction energy between ions of opposite charge is directly proportional to the charge on each ion (Q 1 and Q 2 in Equation 4.1. 1). Thus, more energy is released as the charge on the ions increases(assuming the internuclear distance does not increase substantially).
Alkanes are hydrocarbons that contain
a.
single covalent bonds only.
c.
carbon and oxygen only.
b.
single or double covalent bonds.
d.
carbon, hydrogen, and oxygen.
Please select the best answer from the choices provided
A
B
C
D
Please hurry!!!
Answer:
single or double covalent bonds
Explanation:
properties of proton
Answer:
Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.
Hope this helps☺️
A container of nitrogen gas has a volume of 34 mL at 95 mm Hg. What is the new pressure if the gas volume increases to 55 mL?
Answer:
The answer is 58.73 mmHgExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
So we have
[tex]P_2 = \frac{95 \times 34}{55} = \frac{3230}{55} \\ = 58.72727272...[/tex]
We have the final answer as
58.73 mmHgHope this helps you
Calculate the quantity of heat in joules required to completely vaporize 100 grams of H2O() at 100.°C and 1.0 atm.
The quantity of heat : 226,000 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Also can be formulated :Q = m. Hf
Hf = heat of fusion
Heat required for vaporize /evaporated can be calculated from
Q = m . Hv
m = mass, g
Hv = the heat of vaporization, for water = 2,260 J/g
So :
[tex]\tt Q=100\times 2,260=226,000 J[/tex]
What happens to the mass of substances that go through a chemical reaction?
Answer:
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
Explanation:
Which description refers to cumulus clouds?
are fluffy
form layers
are usually gray
cover most of the sky
Answer:
Are fluffy.
Explanation:
Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile. ... Cumulus clouds may appear by themselves, in lines, or in clusters.
Which structure represents an organ in a plant?
A : vascular system
B: stem
C: xylem
D: chloroplasts
Answer:
the answer is stem please mark me as brainlist
Give the brainliest
Classify the following metals by increasing order of melting temperature
a) Na Li K
Classify the following metals by increasing order of melting temperature
b) Al Mg Na
Explanation:
a. K Na Li
melting point decreases a
down the group since more shells are added down the group hence the the attractive force that the protons exert on the electrons decreases down the group and hence melting point also decreases down the group.
i.e Li,Na,K decreasing order.
And hence the increasing order will be:
K Na Li.
b. Na Mg Al
Effective nuclear charge increases across the period and hence melting point increases across the period since Al Mg and Na are in the same period hence the increasing order will be Na Mg Al.
Answer:
a. K,Na,Li
b. Na,Mg,Al
Explanation:
the first one Lithium because it has small atomic size hence their is greater attraction for the electrons in the energy level ,hence the heat required to break the bond is a lot hence high melting point
the second one Aluminium has a higher mpt than Mg and Na this is because as u go along the period the nuclear charge increases hence exerts higher attraction towards the electrons in the energy levels hence the bond formed is strong hence will require more heat to break.
What are the main components of a basic system? (NOT TALKING ABOUT COMPUTER SYSTEM)
Answer:
Every System has an IPO: Input, Process, Output. When you look at any system, in its simplest form, it has 3 components. It's what I'll call IPO: Input, Process, Output. Input – anything you do to activate the system or give the system to use.
Explanation:
define avagrados law
Whats some evidence that the universe is expanding
Answer:
Hubble's Law
Explanation:
search it!!
Answer:
More Stars are being made expaning the universe new galaxys are being made by stars,dust and dark matter.
What is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons?
A
1+
В.
2+
C.
1-
D
2-
The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.
What is net charge?Net charge is defined as when the number of electrons in an atom does not equal the number of protons, the atom is said to be unstable.
If the number of electrons are less than the number of protons, then they will have positive net charge.
If the number of electrons are more than the number of protons, then they will form negative net charge.
Electrons are defined as negatively charged subatomic particle which together with protons and neutrons forms atom.
Thus, the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.
To learn more about net charge, refer to the link below:
https://brainly.com/question/8233653
#SPJ5
Part A
Decrease the volume of the chamber by dragging the left side inward. What values changed when you decreased the
volume of the container?
Decreasing the volume of the chamber by dragging the left side inward will increase the pressure of the container.
What is pressure?Pressure is the amount of force applied perpendicular to the surface of an object per unit area. The symbol for it is "p" or P.
If the volume of a container is decreased, the gas molecules have less space in which to move around. As a result, they will strike the walls of the container more often, and the pressure increases.
Learn more about the pressure here:
https://brainly.com/question/22613963
#SPJ2
What would be an adaptation for living in the tundra
Answer: you would hace to adapt to the climate
Explanation:
Answer: Migration and hibernation are examples of behavioral adaptations used by animals in the Arctic tundra. The fact that many animals do not live year-round in the tundra means they leave or migrate for a length of time to warmer climates.
