Answer:
Mass = 19.0 g
Explanation:
Given data:
Mass of limestone react = ?
Mass of lime produced = 11.2 g
Solution:
Balanced chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of lime:
Number of moles = mass / molar mass
Molar mass of lime 56.1 g/mol
Number of moles = 11.2 g/ 56.1 g/mol
Number of moles = 0.19 mol
Now we will compare the moles of CaO and CaCO₃
CaO : CaCO₃
1 : 1
0.19 : 0.19
Mass of limestone react:
Mass = number of moles × molar mass
Mass = 0.19 mol × 100.1 g/mol
Mass = 19.0 g
How does an atom end up with an octet, if it loses all of the electrons in its valence shell
Answer:
When atoms have fewer than eight electrons, they have an inclination to react and type a lot of stable compounds.
Thus, associate atom continues to create bonds till associate octet of electrons is formed. this can be called octet rule by Lewis.
why is radioactive decay considered an exponential process
Answer:
It breaks down in mathematically exponential way.
Explanation:
For example if you have 100 grams, after the first decay, its 50. Then 25. Then 12.5, and so on. Rather than, say, 5 grams being subtracted every cycle, it is dilated by the factor of a fraction, making it exponential.
Which statement about ionic bonds is true?
A. ionic bonds form between two nonmetals sharing electrons
B. ionic bonds are very strong attractions because of electromagnetic attractions between a metal and a nonmetal
C. all ionic compounds end in "-ate" or"-ite"
D. type 1 ionic bonds require Roman numerals
what are the orbitals present in the fifth principal energy level
Answer:
what are the orbitals present in the fifth principal energy level
Explanation:
Answer: the fifth principal energy level has the s, p, d, and f orbitals so the answer is letter d
Explanation:
What determines the ratio of ions in an ionic compound?
O A. The charges on the ions
O B. The electronegativity of each atom
O C. The number of bonds formed
D. The period the atoms are in
Answer:
i belive the answer is A if it's not i am very sorry
Tropical fossils in now cold places is evidence for climate change.
True
False
Answer:
True
Explanation:
Finding tropical fossils in now-cold places is evidence for climate change. This indicates that the site at which the fossils were found once had a tropical climate.
The molar mass of a substance is 92.010g. The substance is 30.4% nitrogen and 69.9% oxygen. What is the empirical formula and the molecular formula of the substance
Answer:
Empirical formula = NO₂
Molecular formula = N₂O₄
Explanation:
Percentage mass of Nitrogen = 30.4 %
Percentage mass of Oxygen = 60.9 %
Mole ratio of the elements:
Nitrogen = 30.4/14 = 2.17
Oxygen = 69.9/16 = 4.37
Dividing by the smallest ratio to obtain a simple ratio
Nitrogen: 2.17/2.17 = 1
Oxygen; 4.37/2.17 = 2
Therefore, the simplest mole ratio is 1:2
Empirical formula = NO₂
Molecular formula = n(empirical formula), therefore, molecular mass = n *(empirical mass)
92.010 = n(14 + 32)
92.010 = 46n
n = 92.010/46
n = 2
Therefore, molecular formula = 2(NO₂)
Molecular formula = N₂O₄
Help me with this please
An object with a mass of 7 kg accelerates 5 m/s2 when an unknown force is 1 point
applied to it. What is the unknown force? F=ma
Answer:
the unknown force is 35kg/m/s²
When atoms share electrons, the electrical attraction of an atom for the shared electrons is called the atom's
write the number 874.591 correct to 2 decimal places
Answer:
874.59
Explanation:
The number after 9 is 1
1 is lower than 5 so we leave the previous number the same
The number 874.591 correct to 2 decimal places is 874.59.
What is a decimal number?A decimal is a fraction written in a special shape. as opposed to writing 1/2, for example, you could express the fraction because the decimal 0.5, where the 0 is inside the one vicinity and the 5 is within the tenths vicinity. Decimal comes from the Latin phrase decimus, meaning tenth, from the root phrase decem, or 10.
What are the types of decimals?terminating Decimal Numbers, non-terminating Decimal Numbers, recurring Decimal Numbers, non-recurring Decimal Numbers.Learn more about decimals here: https://brainly.com/question/703656
#SPJ2
Which of the following terms means that metals can be pulled into thin strands or wires? [like copper]
A. polar
B. alloy
C. ductile
D. malleable
Answer:
D
Explanation:
plz mark brainliest answer if it helps
Answer:
C
Explanation:
Can someone please help !!
Answer: the sugar ge hotter??
Explanation:
Why is electrical conductivity a resourceful property of metals like copper, silver, and aluminum?
Answer:
The electrical conductivity of metals come from the fact that their outer electrons have been delocalised (meaning that the elections are not locked into atoms but can move freely throughout the metal ) .
And , the electrical conductivity of a metal is determined by the ease of movement of the electrons past the atoms under the influence of an electric field.
help me with science for brainiest:)
Answer:
The answer is C. Plasma
How many atoms are in 4.9 moles of Sodium (Na)?
a
112.7 atoms
b
6.022 X 10 ^ 23 atoms
c
2.95 X 10 ^ 24 atoms
d
8.14 X 10 ^ -24 atoms
Answer:
C.) 2.95 x 10^24
Explanation:
make a ratio
1 mole = molar mass x 6.023 x 10^23
# moles = x
1 mole= 22.9 x 6.023 x 10^23
4.9 moles= x
cross multiply
then divide
= 2.95 x 10^24
True or False Each layer has different properties
HELPPP
Answer:True
Explanation:
There is 5 different type of layers i think
Answer:
true I'm pretty sure sry if I get it wrong
What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass number of 39
Answer:
NO OF NEUTRON =MASS NO -ATOMIC NO
=39-19
=20
bcz atomic no is equal to no of electrons
mark as brainliest
What is happening in this diagram?
4 iterations of the following structure: 2 carbons double bonded to each other, each bonded to H above, the left C bonded to H below and the right to R below. The chain begins with an I and a dot. A curved arrow points from the dot to the space before the first structure above; curved arrows point left and right from the double bonds to the spaces before and after the structures. Arrow points to a long chain of carbons, I at the beginning of the chain. The carbons are all bonded to H above, and alternate bonding to H and R below.
Polymers are forming large monomers.
Monomers are forming large polymers.
Polymers are breaking down into monomers.
Monomers are breaking down into polymers.
ANSWER:
Monomers are forming large polymers.
Answer:
It’s B: Monomers are forming large polymers
Explanation:
Answer:
B. Monomers are forming large polymers.
Explanation:
Lead (IV) oxide
With ionic and polyatomic compounds
Answer: [tex]PbO_2[/tex]
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here element lead is having an oxidation state of +4 called as [tex]Pb^{4+}[/tex] cation and [tex]O^{2-}[/tex] is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]PbO_2[/tex]
. Which of the following statement is false?
D. Metalloids are conductors.
B. The least reactive elements are on the right side of the periodic table.
C. Metals are most reactive on the left hand side of the periodic table.
A. Most metals are solids.
Answer:
B
Explanation:
Answer: hey im here, whats up?
Explanation:
Given that a particular photon has a frequency of 2.2 x 10'7 Hz, calculate the photon's energy. Submit your answer in
scientific notation, rounded to two significant figures.
The energy of the photon is
X10
Answer:
E = 15×10⁻²⁹ J
Explanation:
Given data:
Frequency of photon = 2.2× 10⁷ Hz
Energy of photon = ?
Solution:
Formula:
E = h.f
h = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 2.2× 10⁷ s⁻¹
E = 14.586 ×10⁻²⁹ J
E = 15×10⁻²⁹ J
The energy of photon is 15×10⁻²⁹ J.
what are unicellular organism?
Answer:
Single celled organism
Explanation:
They fall under two categories:
Eukaryotes and prokaryotes.
Eukaryotes: Evolved from prokaryotes, they are larger and more complex. Unlike prokaryotes, they have a nucleus. Can be single celled or multicellular.
Prokaryotes: Oldest cell type, small and simple. They do not have a nucleus. Open unit with no compartments.
Atoms are neutral because the number of
A
protons equals the number of neutrons
B
protons equals the number of electrons
C
neutrons is greater than the number of protons
D
neutrons is greater than the number of electrons
Answer:
I'm pretty sure it's b sorry if I get it wrong
How many moles would there be in 20.0 g of sodium chloride?
Answer:
20.0/1 x 1mole/58.44=0.34
(Atomic mass of salt)
Been a minute since I've done this, but this is how I remember doing it, soo..hope this helps!
We have seasons because
Answer:
Earth's axis is tilted at an angle of about 23.4 degrees and different parts of Earth receive more solar energy than others. Earth's orbit around the Sun is elliptical. Because of Earth's axial tilt (obliquity), our planet orbits the Sun on a slant which means different areas of Earth point toward or away from the Sun at different times of the year.
Explanation:
does anyone know what convection,conduction,radiation??
Answer:
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
Why will carbon and hydrogen share electrons equally?
Explanation:
Carbon has four electrons in its outermost shell and needs four more to fill it.These elements share the electrons equally among the carbons and the hydrogen atoms, creating a nonpolar covalent molecule. Figure 1. Whether a molecule is polar or nonpolar depends both on bond type and molecular shape.
Protons-29
Neutrons
35
electrons-29
Atomic Mass-64
Answer:
atomic mass=Protons+Neutrons=29+35=64
Explanation:
please complete question.
How many grams of hydrogen are produced from the reaction of 8.50 moles of zinc with an excess of hydrochloric acid?
Zn+2HCl = ZnCl2+H2
Answer:
17.136 g H2
Explanation:
First we need to convert moles of Zinc to moles of Hydrogen in order to find out how many moles of hydrogen are produced.
When we look at our balanced equation, we can see that for every mole of Zn reacting, there is 1 mol of H2 produced. (imagine a 1 in front of the elements that have no numbers in front of them)
8.5 mol Zn * [tex]\frac{1 mol H_{2} }{1 mol Zn}[/tex] = 8.5 mol H2
Now we will convert from moles of Hydrogen to grams
The atomic mass of H2 is 2(1.008) g/1 mol... so we will use this to convert to the number of grams of Hydrogen produced..
8.5 mol H2 * [tex]\frac{2(1.008)grams H2}{1 mol H2}[/tex] = 17.136 g H2
