Answer:
im pretty sure its the second one
what is the molecular formula of water
Answer:
your very f,k,n, d,u,m,b
Explanation:
Answer:
H2o
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
Explain why BH3 is trigonal planar and NH3 is trigonal pyramidal.
Answer:o It is important to realise that mixing will be small unless there are electrons in the 4a1 LUMO, this is why NH3 is pyramidal while BH3 is planar! ... This mixing is very strong and stabilises the 3a1 MO substantially and hence NH3 is trigonal pyramidal and not planar.
Explanation:
In the process of cooking, making tea, or mixing paint, you combined substances. Sometimes, the act of mixing substances results in the formation of new substances.
If two substances mix and one or more new substances form, a chemical change has occurred. Which event do you think results in a chemical change?
A.
Oil and vinegar mix to make salad dressing.
B.
Copper and zinc mix to make brass.
C.
Salt and water mix to make salt water.
D.
Sugar and water mix to make sugar water.
Answer:
B.
Copper and zinc mix to make brass.
Explanation:
This is the only answer in which a new substance is created, the rest of the choices are just mixtures
Briefly outline an experiment that could be done to determine if flame color is dependent on temperature. What would you expect the results to show?
Answer:
Flame color is dependent on temperature.
Explanation:
Scientists have learned from various experiments which shows that red flames occurs when the temperature reaches to 980º up to 1,800º Fahrenheit. The colour of flames turn orange when the temperature reaches to 2,000º up to 2,200º Fahrenheit and when the temperature approaches 2,400º to 2,700º Fahrenheit, flames colour turns white.
in the cycle shown is mantle made of silicate rocks?why?
answer;
Yes,because the mantle under the crust is about 1800miles deep (2890km).It is composed mostly of SILICATE ROCKS in magnesium and iron.
or
Yes, because it is composed mostly of SILICATE ROCKS in magnesium and iron.
beginner hereee!
Answer: yes,because it is composed mostly of SILICATE ROCKS in magnesium and iron
Explanation:
The rocks that is present in Earth's mantle are mostly silicates due to the presence of high amount of silicon.
Silicates is a compound that is made up of a silicon and oxygen atoms. The mantle is made up of 44.8% oxygen, 21.5% silicon, and 22.8% magnesium by composition.
The most common compound that present is Silicon dioxide (SiO2) in the concentration of 48%, followed by Magnesium Oxide (MgO) at the concentration of 37.8%. Olivine, pyroxenes, spinel, and garnet are the types of rocks that is found in mantle.
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What 2 elements are in the same group?
Oxygen and Chlorine
Sodium and Chlorine
Hydrogen and Sodium
Calcium and Helium
Explanation:
hydrogen and sodium are in same froup
Determine the bond type formed between Hg and F
a
Covalent
b
Simple Ionic
c
Multivalent Ionic
Answer:
Multivalent Ionic
Explanation:
The type of bond formed between the atoms of two elements can easily be deduced from the magnitude of electronegativity difference between the two bonding atoms.
A summary of electronegativity differences and corresponding types of bonds are shown below as adapted from chemlibretexts, where Δχ is the difference in electronegativity ;
ionic if Δχ ≥ 2.0
polar if 2.0 > Δχ > 0.5
nonpolar if 0.5 > Δχ
To determine the type of bond between Hg and F. Hg has an electronegativity of 2 while F has an electronegativity of 4. the difference in electronegativity (Δχ) is 4 - 2 = 2
This corresponds to a multivalent ionic bond because mercurous ion is the
Hg2^2+ ion and this leads to the formation of Hg2X2 (mercury I fluoride).
It takes of heat to raise the temperature of Object A by , and to raise the temperature of Object B by . Suppose A and B are brought into contact. A is initially hotter. A is seen to cool down by . How would you calculate the rise in temperature of B? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Hi, the given question is incomplete, the complete question is:
It takes 4.37 J of heat to raise the temperature of Object A by 1°C, and 2.88 J to raise the temperature of Object B by 1°C. Suppose A and B are brought into contact. A is initially hotter. A is seen to cool down by 6.3°C . How would you calculate the rise in temperature of B?
Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Answer:
The correct answer is 9.56 degree C.
Explanation:
Based on the given information, the given object A is initially hotter than object B, and the direct contact between them permits the transfer of heat between them. Based on the law of conservation of energy, the energy cannot be created nor be destroyed. In the given case, the energy, which is lost from object A can only be gained by object B.
Let us consider that both the objects exhibits equal mass, now in order to determine the transfer of energy between them there is a need to multiply the heat capacity with the temperatures. Therefore,
Energy lost by object A = Energy gained by object B
Heat capacity of object A × Temperature lost by object A = Heat capacity of object B × Temperature gained by object B
4.37 J/°C × 6.3 °C = 2.88 J × Tb
Tb = (4.37 J/°C × 6.3° C) / 2.88 J
Tb = 9.56 °C
HELP PLEASE DUE SOON!!!
calculate the following the correct amount of significant figures 1.25+3.69277+125.993
Answer: 129.93577
Explanation:
There-
How do you think dolphins find food in dark water, especially if
what they are looking for does not make any noise? What other
sense might they use to "see” without using their eyesight?
Answer: Dolphins use the sense (sound) to find food in dark water.
Explanation: Echolocation allows dolphins to “see" by interpreting the echoes of sound waves that bounce off of objects near them in the water. To echolocate objects nearby, dolphins produce high-frequency clicks. ... This information is critical for dolphins to find food and navigate in dark or murky waters.
SiS2 is a _____ compound
Answer:
SiS2, silicone disulfide, is a linear, nonpolar compound.
What element am I?
1 valence electrons, 1 energy level
Group of answer choices
H
He
Li
Be
Answer:
H- hydrogen
Explanation: Hydrogen is in the first group meaning that it only has 1 valence electron and 1 energy level
in the formation of silicon carbide represented by the chemical equation SiO2+3C-->SiC+2CO,8.0 mole of each reactant are available for the reaction. What substance is the limiting reactant?
The limiting reactant : C
Further explanationLimiting reactant : the smaller ratio from mol and their reaction coefficient
Reaction
SiO₂+3C⇒SiC+2CO
Reactants : SiO₂ and C
mol ratio
SiO₂ :[tex]\tt \dfrac{8}{1}=8[/tex]
C :[tex]\tt \dfrac{8}{3}[/tex]
[tex]\tt \dfrac{8}{3}<8\rightarrow C~as~limiting~reactant[/tex]
why doesn't she want me
Answer:
Who knows...
Explanation:
:( :( :( :( :(
Determine the pressure change when a constant volume of gas at 1.00 atm is
heated from 293 Kelvin to 303 Kelvin
Hurry please
Answer:
P₂ = 1.03 atm
Explanation:
Given data:
Initial pressure = 1.00 atm
Initial temperature = 293 K
Final temperature = 303 K
Final pressure = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1.00 atm / 293 K = P₂/303 K
P₂ = 1.00 atm × 303 K / 293 K
P₂ = 303 atm. K /293 K
P₂ = 1.03 atm
When you are getting up for school in Texas, a student on the other side of earth is getting ready for bed what is the reason for this?
A) The moon revolves around earth
B) Earth rotates on its axis
C) The sun rotates on its axis
D) Earth revolves around the sun
Answer:
Its B
Explanation:
Which of the following is an example of a combustion reaction?
A) Mixing of an acid and base
B) Photosynthesis in plants
C) Lighting of a Matchstick
D) Reacting sodium and chlorine
Answer:
C) Lighting a matchstick
Explanation:
Mixing an acid and base will cause a neutralization reaction, a type of double displacement.
Photosynthesis is just a series of chemical reactions, but don't deal with the use of O2, but rather it's creation.
Reacting sodium and chlorine would make NaCl in a synthesis reaction.
Answer:
C) Lighting a matchstick
Explanation:
Based on atomicity , how molecules are categorized
Answer:
On the basis of atomicity, molecules can be classified as : Monoatomic-composed of 1 atom e.g. He, Ne, Ar (all noble gases are monoatomic) Diatomic-composed of 2 atoms e.g. H2 , N2 , O. Triatomic-composed of 3 atoms e.g. O
Thank you and please rate me as brainliest as it will help me to level up
pls help! no explanation needed
Which of these chemical equations describes an acid-base neutralization reaction?
1) 2Al(s) + 3H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + 3H₂(g)
2) SO₂(g) + H₂O(l) --> H₂SO₃(g)
3) LiOH(aq) + HNO₃(aq) --> LiNO₃(aq) + H₂O(l)
4) CaBr₂(aq) + H₂SO₄(aq) --> CaSO₄(s) + 2HBr(g)
Answer:
Option 3.
LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)
Explanation:
To know which option is correct, we must have an ideal of what is acid–base neutralization.
Neutralization is a reaction involving an acid and a base which produces salt and water only.
With the above information, we can easily detect the equation describing acid-base neutralization reaction by considering the products of each reaction to see the one that has water as part of the products.
From the question given above, only the 3rd equation gas water as part of the products i.e
LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)
Hence, equation 3 is an acid-base neutralization reaction
Electrolysis of water occurs according to the following equation...
2H20 ->2H2+O2
If electrolysis is performed with 100% efficiency on 100 grams of water. How many grams of hydrogen gas will be produced?
a. 11 grams
b. 50 grams
c. 4 grams
d. 100 grams
Answer:
11.1g
Explanation:
Given parameters:
Mass of water = 100g
Unknown:
Mass of hydrogen gas = ?
Solution:
We need to write the balanced reaction equation first and solve from the known to the unknown;
2H₂O → 2H₂ + O₂
Now, find the number of moles of the given specie;
Number of moles of H₂O = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles = [tex]\frac{100}{18}[/tex] = 5.56mol
2 mole of water produced 2 mole of hydrogen gas;
5.56 mole of water will produce 5.56 mole of hydrogen gas
Mass of hydrogen gas = number of moles x molar mass
molar mass = 2(1) = 2g/mol
Mass of hydrogen gas = 2(5.56) = 11.1g
Help meee :( if u help me i give u my love ):)
Answer:
1) carbon dioxide
Explanation:
What are the six physical properties and 2 chemical properties of this image?
Please Help!!!
Answer:
physical - cloth
tree
brick
chair
lights
glass
chemical- fuel
fire
Explanation:
What parts of the eye are transparent and refract light? *
10 points
A. Retina and optic Nerve
B. Iris and pupil
C. Cornea and Lens
D. Lens and Optic Nerve
Answer:
Cornea
Lens
Retina
Explanation:
Brainliest?
Arrange the following elements from lowest to highest ionization energy: Be, Mg, Ca, Rb, Sr
a. Be, Mg, Ca, Rb, Sr
b. Rb, Sr, Ca, Be, Mg
c. Rb, Sr, Ca, Mg, Be
d. Be, Mg, Ca, Sr, Rb
Answer:
It's (C)
Explanation:
I did research trust me I seached up the ionization energy of all of them, Be, Mg, Ca, Rb, and Sr
Since ionization energy decreases down the group and and increases across the period, the order from lowest to highest ionization energy is; Rb, Sr, Ca, Mg, Be.
In the periodic table, certain trends vary across the period and down the group. Trends like ionization energy increase across the period but decreases down the group.
Looking at the elements mentioned, the correct arrangement in order of the lowest to highest ionization energy is; Rb, Sr, Ca, Mg, Be.
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0.22g of carbon dioxide are dissolved in 400 cm3 of pure water.
Calculate the concentration in mol/dm3 of the
solution produced.
Answer:
0.0125mol/dm³
Explanation:
Given parameters:
Mass of carbon dioxide = 0.22g
Volume of water = 400cm³
Unknown:
Concentration in mol/dm³ = ?
Solution:
Concentration is the amount of solute dissolved in a solvent.
The formula is expressed as;
Concentration = [tex]\frac{number of moles}{volume}[/tex]
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CO₂ = 12 + 3(16) = 44g/mol
Number of moles = [tex]\frac{0.22}{44}[/tex] = 0.0005mol
Now,
1000cm³ = 1dm³
400cm³ = [tex]\frac{400}{1000}[/tex] = 0.4dm³
Insert the parameters and solve;
Concentration = [tex]\frac{0.005}{0.4}[/tex] = 0.0125mol/dm³
40 Points Need help ASAP
Explain how fossil evidence is evidence of plate tectonics.
Answer:
Answer
Explanation:
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. ... This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.
Answer: Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.
Explanation: I hoped that helped plzz mark as brainliest !!
What type of heat transfer happens when warm air in
your living rises from the heater to the ceiling?
1. Radiation 2. Conduction 3. Convection
Answer:
the answer is radiation
The density of aluminum is 2.70 g/cm^3? How many aluminum atoms are in a block of aluminum
with a volume of 114.2 cm^3?
Answer:
68.77×10²³ atoms
Explanation:
Given data:
Density of Al = 2.70 g/cm³
Volume of Al block = 114.2 cm³
Number of atoms of Al = ?
Solution:
First of all we will determine the mass of Al.
D = m/v
2.70 g/cm³ = m/114.2 cm³
m = 2.70 g/cm³ × 114.2 cm³
m = 308.34 g
Now we will calculate the number of moles of Al.
Number of moles = mass/molar mass
Number of moles = 308.34 g/27 g/mol
Number of moles = 11.42 mol
Number of atoms of Al:
1 mole = 6.022×10²³ atoms
11.42 mol × 6.022×10²³ atoms/1 mol
68.77×10²³ atoms
Definition: This is a measure of the quantity of matter.
Example: Yours may be 65 kilograms. You measure it with an analytical balance.
Answer:
Mass
:)
Explanation:
Answer:
Mass
Explanation: