A hypothetical element has two main isotopes with mass numbers of 59 and 62. If 73.00% of the isotopes have a mass number of 59 amu, what atomic weight should be listed on the periodic table for this element? Answer in units of amu.
since 73% of the isotope is given, take 100%-73% to get the remaining % of the isotopes which is going to be 27%.
hence,
atomic weight= (73×59) + (27×62)
=4307+1302
=5609 amu
A 0.2027 gram sample of finely powdered limestone (mainly CaCO₃) was dissolved in 50 mL of 0.1035 M HCl. The solution was heated to expel CO₂ produced by the reaction. The remaining HCl was then titrated with 0.1018M of NaOH and it required 16.62 mL. Calculate the percentage of CaCO₃ in the limestone sample? CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
Answer:
Explanation:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
100 gm + 2000 mL of M HCl
Amount of HCl remaining = .1018 M of 16.62 mL
= .1018 x 16.62 mL of M HCl
= 1.69 mL of M HCl
Initial HCl taken = 50 mL of .1035 M HCl
= 5.175 mL of M HCl
HCl reacted = 5.175 - 1.69 mL of M HCl
= 3.485 mL of M HCl
2000 mL of M HCl reacts with 100 gm of CaCO₃
3.485 mL of M HCl will react with .174 grams of CaCO₃
percentage of calcium carbonate = .174 x 100 / .2027
= 85.84 %
describe the purpose of using a chemical equation.
Answer:
The purpose of using a chemical equation is to keep track of elements and the number of atoms of each of the elements on each side of the equation. ... They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out.
Answer:
:0
Explanation:
Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.
Can an Atom be broken down into a smaller substance? Yes or No Explain.
Answer:
Yes
Explanation:
A atom is made out of 3 elements, protons which are positive charges, electrons which are negative charges that swirl around the atom, and a neutron with a neutral charge. The nucleus of the atom is basically the center of the atom.
What are two properties of most nonmetals
Answer: Summary of Common Properties
High ionization energies.High electronegativities.Poor thermal conductors.Poor electrical conductors.Brittle solids—not malleable or ductile.Little or no metallic luster.Gain electrons easily.Dull, not metallic-shiny, although they may be colorful.Explanation:
May I please have brainiest?
Answer:
The two properties of most non metals are high ionization energy and poor electrical conductivity. The correct option among all the options that are given in the question is option "1". In general it is known that nonmetals are very poor conductors of heat and electricity. The nonmetals that are solid are normally very brittle and has very little or no metallic luster at all. Nonmetals are highly reactive and show variety of chemical properties. It can also be pointed out that the nonmetals gain electrons very easily.
brainliest pleaseee :)
Classify the following reactions and complete the given below
A) NaCl + AgNO3 - NaNO3 + AgCl
Answer:
chemical equation balance.
Explanation:
if you need more explanation , comment.
Choose all the answers that apply. lonic compounds ___.
A. do not dissolve in water
B. have high melting points
C. have low melting points
D.dissolve easily in water
E. conduct electricity when melted
(science class not chemistry)
Answer:
E conduct electricity when melted
Explanation:
They can not produce electricity until dissolved/ melted in water
What’s science in science
Answer:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)
Explanation:
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences
Match each description to a type of radiation Drag each item to the appropriate bin.
Answer:
Explanation:
Beta radiations:
mass 1/200 , charge -1, medium penetration
Beta radiations are result from the beta decay in which electron is ejected.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
Properties of alpha radiation:
mass 4 amu, charge +2, least penetration
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
Gamma radiations:
mass 0, charge 0, deepest penetration
Gamma radiations are high energy radiations having no mass.
These radiations are travel at the speed of light.
Gamma radiations can penetrate into the many materials.
These radiations are also used to treat the cancer.
Lead is used for the protection against gamma radiations because of its high molecular density.
The lead apron are used by the person when treated with gamma radiations.
Answer question number 3
Assume that the pendulum clock shown in the photograph is a closed
system
Which statement describes evidence that the pendulum's energy is conserved
even as it eventually stops moving?
A. Energy must be added to the pendulum to keep it from slowing
down
B. Some of the clock's matter is transformed into new energy
C. The amount of each type of energy in the system can be
measured
D. All its mechanical energy is transformed into other forms of
energy
Answer:
Explanation:
d
Answer:
D. All it’s mechanical energy is transformed into other forms of energy.
Explanation:
I got it right
Which types of reactions would result in the formation of precipitate?
Answer:
Double Displacement Reaction
Explanation:
A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.
#8- please help i suck at this, ill mark brainliest
Answer:
A. Synthesis
B. Combustion
C. Single-replacement
D. Decomposition
Explanation:
A: Synthesis. Two reactants are combined to form, or synthesize, one product.
B: Combustion. This is the general reaction for combustion. When something combusts, oxygen must be present. Carbon dioxide and water must also be produced.
C: Single-replacement. The oxygen from Fe₂O₃ is moved to K to form K₂O. Only one thing is being moved, or replaced.
D: Decomposition. You have one compound that breaks into, or decomposes, into two products.
Explain why the several different types of microscopes are all necessary.
Answer:
some zoom in farther
Explanation:
some microscopes zoom in farther than others so we can see even smaller things
Can someone please help me
Why are atoms neutral?
A They have neutrons in the nucleus
B. They have the same number of protons and electrons
They tend to have 8 valence electrons
D
None of the above
Answer:
B. They have the same number of protons and electrons
Explanation:
Protons have a charge of +1, electrons have a charge of -1, and neutrons have no charge, making them neutral. When there are the same number of protons as there are electrons, the charges balance out, leaving you with a neutral atom.
What will the coefficients be for the following balanced equation? (a) N2 + (b) H2 → (c) NH3
Answer:
his reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.
N
+
H
→
N
H
3
We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to
N
2
+
H
2
→
N
H
3
Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.
We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.
N
2
+
3
H
2
→
2
N
H
3
This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.
I hope this was helpful.
Explanation:
Answer:
1N2 + 3H2 →2NH3
Explanation:
Plato answer
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
Sign out
Parts of mixture
a / can not be separated
b/ have new properties after they are mixed
C/ form achemicl combination of two or more atoms
Answer:
B- Have new properties after they are mixed
I hope this helps
This illustration is an example of a
The illustration is an example of surface waves.
The ___ has many functions; one is to regulate growth.
Growth hormon somatotropin
Which of the following elements has the largest electronegativity? A) Bismuth B) Nitrogen C) Potassium D) Arsenic
PLZ HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Reactivity
Explanation:
Luster. Ductile, and Malleabillity are all physical.
Order the masses from smallest to largest
Can someone please tell me if this right.
Answer:
1. 7.86 × 10⁴ g
2. 7.86 × 10⁴ kg
3. 1.989 × 10¹³ mg
4. 1.989 × 10²⁸ kg
5. 1.989 × 10³³ g
Explanation:
The easiest way to make sure you have the right answer is to convert all units to the same unit.
A. 1.989 × 10¹³ mg = 1.989 × 10¹⁰ g
B. 7.86 × 10⁴ g
C. 1.989 × 10³³ g
D. 7.86 × 10⁴ kg = 7.86 × 10⁷ g
E. 1.989 × 10²⁸ kg = 1.989 × 10³¹
The correct order is B < D < A < E < C
Joe bought a roll of gray duct tape containing 5400 inches. If there are 5280 feet in a mile, how
many miles long is Joe's roll of duct tape?
Answer:
STANDARD: 0.085 mi, 450 ft, or 150 yds
METRIC: 0.137 km, 137.16 m, or 13716 cm
Explanation:
An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
pls help ill mark you as brainliest
Answer:
Explanation:
Synthesis- D
Combustion- C
Decomposition- A
Single Displacement- C
Double Displacement- B
You are standing at position X. Choose the diagram that shows your position when you perceive a sound lower than the actual pitch of the siren.
Answer:
The answer is the second picture.
Explanation:
When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
What is pitch of a sound?
The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.
Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.
Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
Learn more about pitch of sound here: https://brainly.com/question/61859
#SPJ2
#7- pls help me ill mark you brainliest and ill give you 5 stars <3
Answer:
I think it is synthesis
Answer:
The answer is Synthesis
Explanation:
The two objects combine to make a bigger object
3. Two boxes need to be moved. Box A is 10 kg. Box B is 3 kg. Which box will 1 point
require more force to move?
BOXA
BOX
Answer:
box A
Explanation:
10 is bigger than 3 since 10 is bigger it has more force in it