Answer:
Alkali metals are among the most reactive metals. This is due in part to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. ... All these characteristics can be attributed to these elements' large atomic radii and weak metallic bonding.
Explanation:Because they have just one valence electron, group 1 elements are very reactive. As a result, they are found in nature only in combination with other elements. Alkali metals are all solids at room temperature. ... From the top to the bottom of group 1, the elements have heavier, more reactive atoms.
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Hydrogen bromide is a chemical compound. It’s formed from atoms of hydrogen and bromide, two
A
electrons.
B
elements.
C
neutrons.
D
nuclei.
Answer: The correct option is B. elements.
Explanation:
A chemical compound is defined as the specie which is formed by the combination of two or more elements. For example: Water, carbon dioxide, etc..
Elements is defined as the chemical specie which consists of only one type of atom. For example: Hydrogen, Oxygen, etc..
Now, when hydrogen element and bromine element combines, it leads to the formation of a heteronuclear chemical compound known as hydrogen bromide having chemical formula HBr.
Hence, the correct option is B. elements.
Hydrogen and bromine are two elements that form hydrogen bromide (HBr).
COMPOUND:
A compound is a chemical substance made up of chemical combination of two or more elements. According to this question, Hydrogen bromide is a chemical compound formed from atoms of hydrogen (H) and bromine (Br). These two atoms that make up hydrogen bromide are that of elements. Therefore, it can be said that hydrogen and bromine are two elements that form hydrogen bromide (HBr).Learn more at: https://brainly.com/question/13516179?referrer=searchResults
maintaining an internal body temperature is one of the key components to maintaining homeostasis
Answer:
maintaining an internal body temperature is one of the key components to maintaining homeostasis
It's true since homeostasis is the regulation of body temperature
What is the correct formula to determine density?
Answer:
density =mass/volume
Explanation:
p=m/v
p means raw
m means mass
v means volume.
The combustion of propane (C3H8) creates water and CO2. Looking at the
reaction below, which of the following would be the mole ratio between propane
and carbon dioxide? *
C3H8 +502->4H2O + 3C02
A)3 mole CO2 / 5 mole C3H8
B)3 mole C3H8/4 mole CO2
C)3 mole CO2 / 1 mole C3H8
D)3 mole C3H8 / 1 mole CO2
Answer:
C)3 mole CO2 / 1 mole C3H8
Explanation:
Will the composition of water molecules vary depending on their source?
Answer:
It does not matter where the sample of water came from or how it was prepared. Its composition, like that of every other compound, is fixed.
Which two structures are connected by the ear bones?
eardrum and stirrup
stirrup and auditory nerve
auditory nerve and cochlea
cochlea and eardrum
Answer:
I THINK it is A
Explanation:
Answer: it is the eardrum caus ei used it on my test and as well got it right
Explanation: because it just is
[tex]hut7utpojghuire\\kjionbenhrmhbnhknokgn\\bihkjihjgnhrk\\\\gnthnrt\\hgnth\\\alpha thtrnhjn4t also this is for fun to me[/tex]
Solid mercury (II) oxide produces liquid mercury and oxygen gas
Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds.
Which of the following is a true statement? The narrow bay formed by the movement of glaciers are fjords. Coral reefs and sandbars form lagoons. Glaciers affect the size of lagoons. Glacier movements can produce distributaries.
Answer:
A the first one
Explanation:
Answer:
The Answer is fjords
Explanation:
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How many grams of H2O are in 34.53 moles of H2O??
Answer:
m=621.54g
Explanation:
number of moles= mass of H2O/molar mass of H2O
n=m/mm
make mass the subject of the formula
m=n*mm
find molar mass of water
H2O=1(16)+2(1)
mm= 18.0g/mol. n=34.53mol
hence, m=34.53mol*18.0g/mol
m=621.54g
Which of the following describes light? (SELECT ALL THAT APPLY.)
A. Light passes through all objects.
B. Light is reflected off the surface of mirrors.
C. Light travels in a straight line.
D. Light waves behave in predictable ways.
Answer:
The light reflects twice before it finally exits the system. Draw a normal at the point of incidence to the first mirror; measure the angle of incidence (45 degrees); then draw a reflected ray at 45 degrees from the normal. Repeat the process for the second mirror.
Explanation:
Hope that helps!
Please help I’ll make brainlist
Explanation:
c realsed from the galaxie
Answer:
C
Explanation:
A P E X
What do you notice about the movement of the molecules of the two samples?
Explanation:
For sample A, I put the temperature to 93.2 C and sample B to 6.8 C. Once I dragged them together, I noticed that the numbers were going down the second I put them together! Sample A was getting colder and Sample B was getting warmer. As I let both the samples do their thing, I realized they weren't changing temperatures anymore. Both samples stopped at 50.0 C and have never changed temperatures since then.
10 points!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
B
Explanation:
i think the filtering would make it possible to separate the liquids....
Answer:
My friend is guessing so she says it's letter C
Explanation:
Sorry if she is wrong.
A compound is found to contain 25.24 % sulfur and 74.76 % fluorine by weight. To answer the questions, enter the elements in the order presented above. 1. What is the empirical formula for this compound
Answer:
[tex]SF_5[/tex]
Explanation:
Hello!
In this case, when determining empirical formulas by knowing the by-mass percent, we can first assume we have 25.24 g of sulfur and 74.76 g of fluorine, so we compute the moles:
[tex]n_S=25.24g*\frac{1mol}{32.07g} =0.787mol\\\\n_F=74.76g*\frac{1mol}{19.00g}= 3.935mol[/tex]
Now, we divide the moles of both S and F by the fewest moles, in this case, those of S in order to determine the subscripts in the empirical formula:
[tex]S=\frac{0.787}{0.797}=1 \\\\F=\frac{3.935}{0.797}=5[/tex]
Therefore, the empirical formula is:
[tex]SF_5[/tex]
Best regards!
MULTIPLE CHOICE QUESTION
If
you are warming yourself near the
campfire, you are experiencing heat
transfer from the fire, through:
Convection
Conduction
Radiation
Answer:
radiation
Explanation:
What are the horizontal rows called on the Periodic Table?
O group
period
family
Answer:
Periods :)
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Which element has the greatest average atomic mass?
Answer:
Tellurium
Explanation:
Edg 2021
what is bohr's model?
Answer:
In atomic physics, the Bohr model or Rutherford–Bohr model, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity.
Answer:
BOHR'S MODEL OF ATOM :
In order to overcome the objections raised against Rutherford's model of the atom, Neils Bohr put forward the following postulates about the model of an atom:
(i) Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom.(ii) While revolving in discrete orbits the electrons do not radiate energy.These orbits or shells are called energy levels. Energy levels in an atom are shown in Fig.
There orbis for shells are represented by the letters K,L,M,N... or the number n = 1,2,3,4...
ABOUT BOHR :
Neils Bohr (1885-1962) was born in Copenhagen on 7 October 1885. He was appointed professor of physics at Copenhagen University in 1916. He got the Nobel prize for his work on the structure of atom in 1922. Among Professor Bohr's numerous writings. three appearing
s books are:
(i) The Theory of Spectra and AtomicConstitution. (ii) Atomic Theory and.(iii) The Description of Nature————————————————Which of the following best describes a galvanic cell?
A. Abattery that requires energy to charge it
B. A battery containing an acid and a base
C. A battery containing a spontaneous redox reaction
D. A battery containing a nonspontaneous reaction
Answer:
Your answer is C
Explanation:
The option that best describes a galvanic cell is that a battery containing a spontaneous redox reaction. That is option C.
A Galvanic cell is simply defined as an electrochemical cell that uses the movement of electrons in a reduction-oxidation reaction to produce electrical energy for use.
A Galvanic cell is a battery and is made up of a conducting electrolyte solution and two halve cells which include:
one half-cell of metal A(anode) electrode andone half-cell of metal B(cathode) electrode.In the galvanic cell a spontaneous redox reaction occurs which involves the transfer of electrons from anode to cathode with the release of energy.
Therefore, the option that best describes a galvanic cell is that it is a battery containing a spontaneous redox reaction.
why is the difference between the result for an ideal gas and that calculated using the van der waals equation greater when the gas is confined to 5.00 L compared to 22.4 L
The question is incomplete, the complete question is;
In Sample Exercise 10.16, we found that one mole of Cl2 confined to 22.41 L at 0 °C deviated slightly from ideal behavior. Calculate the pressure exerted by 1.00 mol Cl2 confined to a smaller volume, 5.00 L, at 25 °C. (a) First use the ideal-gas equation and (b) then use the van der Waals equation for your calculation. (Values for the van der Waals constants are given in Table 10.3.) (c) Why is the difference between the result for an ideal gas and that calculated using the van der Waals equation greater when the gas is confined to 5.00 L compared to 22.4 L?
Answer:
See explanation
Explanation:
Since we have
For 5.00 L using Ideal gas law;
PV= nRT
P = nRT/V
P = 1 * 0.082 * 298 K/5.00
P= 4.887 atm
Using Van der walls equation;
[P + an^2/v^2] * [V - nb] = nRT
P = (nRT/ [V - nb]) - (an^2/v^2)
P= 1 * 0.082 * 298/5 - (1 * 0.0562) - (6.49(1^2)/5^2)
P = (24.436/4.9438) - 0.2596
P= 4.683 atm
For 22.4 L
P = nRT/V
P = 1 * 0.082 * 298 K/22.4
P= 1.0909 atm
Using Van der Walls equation;
[P + an^2/v^2] * [V - nb] = nRT
P = (nRT/ [V - nb]) - (an^2/v^2)
P= 1 * 0.082 * 298/22.4 - (1 * 0.0562) - (6.49(1^2)/22.4^2)
P= (24.436/ 22.3438) - 0.0129
P= 1.081 atm
According to Boyle's law, pressure is inversely proportional to volume. Increase in volume leads to decrease in pressure. Therefore the pressure calculated both by the ideal gas equation and Van der Waals equation at 5.00 L is greater than that calculated using both methods at 22.4 L
How many protons, neutrons, and electrons does k^1+ have
Answer:
protons 19
nuetorns 20
electrons 19
metling point 63.65 C
Explanation:
what element is this
Answer:
neon
Explanation:
there are 10 protons
what happen when we put a waterproof paper in hot water and what happens in cold water?
Answer:
When you heat up water, the water molecules start moving around faster and faster. ... So hot water is less dense than cold water. When you put the two together with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and creating purple water.
Explanation:
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What is the systematic name of the following compound?
Li2S
Answer:
the systematic name is called Lithium sulfide.
An inorganic substance composed of the elements lithium (Li) and sulfur (S) is known as lithium sulfide [tex](Li_2S)[/tex].
It is a substance that solidifies in the shape of a crystal. Lithium ions in lithium sulfide have a positive charge, while sulfide ions have a negative charge. The chemical lithium sulfide is important in many industries. It is often employed in the synthesis of various lithium compounds, the manufacture of lithium batteries, and the manufacture of ceramics. Due to their high energy density, lithium batteries are often employed in portable electronics and electric vehicles.
Lithium sulfide is an ionic compound that has a high melting point in terms of physical characteristics. Although it is insoluble in water, many organic solvents can help dissolve it.
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Kichi made a table to identify where she might find acids and bases in her house based on their common uses. Substance ammonium hydroxide sulfuric acid citric acid potassium hydroxide Location cleaning cabinet cosmetics bag refrigerator flashlight What error did Kichi make?
Ammonium hydroxide would be found in the pantry because it is found in vinegar.
Sulfuric acid would be found in the garage because it is used in car batteries,
Citric acid would be found in the garage because it is used to clean rust from metal.
Potassium hydroxide would be found in the kitchen cabinet because it is used in oven cleaner.
Answer:
Kichi made the an error in the 2nd row which is Sulfuric acid.
Sulfuric acid would be found in the garage because it is used in car batteries
Explanation:
Ammonium hydroxide (NH4OH) is used in household cleaners.
Sulfuric acid (H2SO4) is used in industrial chemicals and car batteries.
Citric acid (H3C6H5O7) is in lemons, limes, and oranges.
Potassium hydroxide is used in batteries.
Kichi made a mistake while locating sulfuric acid which is an acid and is used car batteries ,hence it should be found in garage rather than in cosmetics bag.
What is an acid?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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Equilibrium occurs in what type of reactions?
A. Catalytic
B. Irreversible
C. Reversible
D. Combustion
Answer:
B. Irreversible
Explanation:
Answer: C Reversible
Explanation:
Founder's Education Quiz
Match the correct atom to its electronic configuration. please help!!thanks
Neon is the tenth element with a total of 10 electrons. So, the correct atom is neon.
Is this structure named correctly???
Pls answer me fast guys!!
Answer:
No; According to the IUPAC , it should be
3-bromopentan-2-olmagnesium nitrate is a strong electrolyte. Write the transformation that occurs when solid magnesium nitrate
The question is incomplete, the complete question is;
The compound magnesium nitrate is a strong electrolyte. Write the reaction when magnesium nitrate is put into water:
Answer:
Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)
Explanation:
When we say that a compound is a strong electrolyte, we mean that that the compound dissociates completely in solution to form its ions.
This means that all strong electrolytes attain 100% dissociation of the solid in water according to its stoichiometric equation.
For magnesium nitrate, the reaction equation is;
Mg(NO3)2(s)--------->Mg^2+(aq) + 2NO3^-(aq)
if an atom with a mass number of 27 has 14 neutrons,it is an isotope of which element
Answer:
the number of neutrons in above isotope = A - Z = 27 - 13 = 14. Note: The molar mass of aluminium, which is average of atomic masses of all isotopes = 26.981538 g/mol, since 13Al27 is the major isotope.
Explanation:
Answer:
Aluminum
Explanation
mass number = number of protons + number of neutrons
Number of protons = mass number - number of neutrons
No of protons = 27-14 = 13
Aluminum contains 13 protons