Answer:
yeah we cant see it
Explanation:
A radioactive substance has a half life of 2.5 days. How much of 25.0 z is left after 10 days?
1.563 g
Further explanationGiven
A half life of 2.5 days ⇒ t1/2 = 2.5 days
initial sample ⇒ 25 g
duration of decay ⇒ 10 days
Required
sample left after 10 days
Analysis
Use decay Formula :
[tex]\tt Nt=No.\dfrac{1}{2}^{T/t1/2}[/tex]
Solution
[tex]\tt Nt=25.\dfrac{1}{2}^{10/2.5}\\\\Nt=25.\dfrac{1}{2}^4\\\\Nt=\boxed{\bold{1.563~g}}[/tex]
Paraphrase
Substance left after 10 days = 1.563 g
What is the density of laughing gas (N2O) at STP?
Help please
Answer:
1.977 g/L
Nitrous oxide
Names
Molar mass 44.013 g/mol
Appearance colourless gas
Density 1.977 g/L (gas)
Melting point −90.86 °C (−131.55 °F; 182.29 K)
MgO + HBr → MgBr2 + H2O
Answer:
MgO + 2HBr → MgBr2 + H2O
Explanation:
What is the condensation point and freezing point of neon in KELVIN.
Answer:
-415.5°F (-248.6°C)
Explanation:
Answer: The melting point/condensation point of neon is 24.53888889. Of course, I'm sure you can round that. The freezing point would be 521.74. All of this is in Kelvin
What Group would this element be in?
In what eon did single-celled organisms appear?
Mass = 35g
Density = 5 g/cm3
∙What is the Volume?
Answer:
7cm3
.........
Which element cannot participate in hydrogen bonding?
Carbon dioxide
Explanation:
because when hydrogen mixes with oxygen carbon dioxide is canceled out
Part A Read each sentence. Write the letter of the correct answer on the line.
1. Which of the following would result in a chemical change?
A boiling water
C tearing paper
B burning wood
D melting wax
If the statement is true, select True. If it is false, select False.
In a physical change, some of the physical properties of the substance may be altered and the chemical composition remains the same.
True
False
Answer:
True
Explanation:
Yes this statement is true.
In a physical change, some of the physical properties of the substance may be altered and the chemical composition remains the same.
Isomers are molecules with the same molecular formula, but different structural formulae.
How many isomers are there in C7H16?
A.6
B.7
C.8
D.9
Answer:
D 9 is the answer
Explanation:
Hope it helps you
Please mark as brainliest answerWhoever answers the question first and right will get brainly
Answer:
to question two When plant roots grow downwards, it is an example of positive geotropism, because they are growing towards the stimulus, the soil. However, when plant shoots grow upwards, it is an example of negative geotropism as they grow away from the stimulus, the soil.Feb 21, 2018
Explanation:
QUESTION 10
Which of the following is not a characteristic of ionic compounds?
A. Contains metals and non metals
B. Ions form a crystal structure
C. Conducts electricity in the solid state
D. High melting point
Answer: C. Conducts electricity in the solid state
Explanation:
0.190 moles cesium chloride converted to grams
Answer:
31.9881055
Explanation:
0.190*168.35=31.9881055
Which is an example of potential energy?
Question 7 options:
A fox chasing a mouse
A bowling ball rolling towards the pins
A car sitting at the top of a hill
A kite flying in the air
If you have 23mg of water, at what temperature will it Boil?
Answer:
i believe it is in the 200
Explanation:
Why does an ionic bond transfer electrons instead of sharing?
When there is a whole transfer of valence electron between the atoms is called an ionic bond. In this type of bond construction, the atoms get contrarily charged.
The ionic bonds are formed due to electronegativity. According to Pauling, the capability of an atom to draw electrons towards itself is called electronegativity.
When there is a huge contrast in electronegativity between the atoms, the electrons are completely transferred between the atoms.
The atom that relinquishes an electron are called a cation and is positive whereas the atom that acquires an electron are called anions and are negatively charged.
Therefore, due to electronegativity, ionic bonds are formed.
To learn more about ionic bonds follow the link:
https://brainly.com/question/14484184
How much electronic waste does Orlando produce ?
Answer:
20 to 50 million
Explanation:
Consider the compound Al(OH)3. What type of solid does it form?
Answer: crystal lattice
Explanation:
Answer:
A and the next question is c
Explanation:
Edge 2020
Which is larger potassium or bromine
Answer:
potassium.
Explanation:
located at start of period 3, will have larger radius
Answer:
bromine
Explanation:
The ampere is a unit of
A. magnetism.
B. electric current.
C. electric charge.
D. temperature.
Answer: B
Explanation:
The reason its B because Ampere, unit of electric current in the International System of Units (SI), used by both scientists and technologists.
An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit. The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes.
Please Mark Me Brainliest!
Why is oxygen spelt o2
Answer:
it's a diatomic molecule–which is why it is O₂.
Explanation:
Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements. Only a handful of elements on the periodic table are diatomic such as nitrogen, hydrogen, fluorine, chlorine, bromine, and iodine.
Which component is soluble in water
Answer:
salt
Explanation:
2 The polar structure of water allows it to act as a solvent for many substances. Which of the
following statements best explains why water is considered polar?
F The unequal sharing of electrons results in the water molecule having a slightly negative
charge near its oxygen atoms and a slightly positive charge near its hydrogen atom.
G The equal sharing of electrons by the hydrogen and oxygen atoms form weak bonds that are
easily broken during dissociation.
H The unequal sharing of electrons results in the water molecule having a slightly positive
charge near its oxygen atoms and a slightly negative charge near its hydrogen atom.
The equal sharing of electrons by the hydrogen and oxygen atoms create a molecule that is
neutrally charged.
Heated gaseous atoms of elements emit light in unique colored patterns as electrons drop from
excited energy states to ground energy states. Heated hydrogen atoms have only four colored
lines, red, green, blue and violet. What prediction did Niels Bohr make about electrons based on
this information?
Answer:
b
Explanation:
Pls someone help ASAP
Answer:
i answed it in before
Explanation:
Similarities between sliding and fluid friction
What constitutes a solar system?
Contrast the three types of intermolecular forces.
Answer: The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds.
Hope this helps............ Stay safe and have a Merry Christmas!!!!!!! :D
Which word doesn't belong?
period, group, family, eighteen
Answer:
eighteen
Explanation: