Answer:
The correct option is;
B. 5,000 years old
Explanation:
The percentage amount of carbon-14 in the sample = 50%
The half life of carbon 14 = 5700
The half-life of a substance is the time it takes for a given sample of the substance to decay such that only half of the original quantity of the substance remains
The half-life of carbon 14 is around 5.730 years, which means it takes 5,730 years for a given quantity of carbon 14 to decompose and have 50% of the original quantity remaining
Therefore, given that only 50% of carbon 14 is remaining in the bone, the duration for the decomposition is approximately the half life of carbon 14, and the best option is that the age of the bone is approximately 5,000 years.
Silver is a white metal and is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm³. Silver does not react with water, but it does react with nitric acid. Silver tarnishes when exposed to air or light. Which is a physical property of silver?
Convert 0.05 Mm -> mm
Answer:
To convert any value in millimeters to millimeters, just multiply the value in millimeters by the conversion factor 1. So, 0.05 millimeter times 1 is equal to 0.05 millimeters.
Answer:
0.00005
Explanation:
What determines the number of valence electrons an atom has?
Answer:
You can find how many valence electrons an atom has by looking at what group the element is in. For example, oxygen is in group 6... so therefore, it has 6 valence electrons.
Please mark me as Brainliest, I need it to move onto the next level.
What advice should you give to a person exercising on a very hot day?
O A. Remember to wear lots of clothes so you can sweat off more weight!
O B. Take a lot of breaks, and remember to drink fluids!
O C. Don't drink anything, it will give you cramps.
O D. Go all out! A hot day is the best time to try for a personal best.
Answer:
B
Explanation:
You should drink lots of water and take breaks.
Answer:
B
Explanation:
Just answered it in gizmos
Which term describes the dashed line shown in the graph
Answer:
Where's the graph?
Explanation:
Brainliest will be given and anyone who can help me with my psychology exam I’ll give them 100 points
The scientific notation : A. 9.594 x 10⁻³
Further explanationScientific Notation consists of 2 parts
1. the first part: the first digit followed by the decimal point
2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point
Multiply scientific notation :
1. multiply coefficients
2. add the exponents.
3. converted to scientific notation.
3.120 x 10⁻⁷ x 3.075 x 10⁴ =
multiply coefficients[tex]\tt 3.120\times 3.075=9.594[/tex]
add the exponents.[tex]\tt 10^{-7}\times 10^4=10^{-7+4}=10^{-3}[/tex]
combine[tex]\tt 9.594\times 10^{-3}[/tex]
Help I going to fell I have to 11:59 help please
It’s amplify Science
These two arguments both answer the question Why
did Patient 23 feel sick during week 3?
Which of these arguments is more convincing?
Explain your thinking below.
Argument One: Patient 23 felt sick during week 3 because
he was infected with the C. jejuni bacteria. From "The Human
Microbiome" article, I know that “this kind of C. jejuni
infection can cause diarrhea, vomiting, and fever-all the
symptoms of food poisoning." These symptoms match the
doctor's note for Patient 23 for week 3. When Patient 23 felt
healthy during week 1, the C. jejuni bacteria was not present
in his gut microbiome. In week 3, when he felt sick, C. jejuni
was present. Therefore, C. jejuni is probably the cause of his
sickness.
Argument Two: Patient 23 felt sick during week 3 because
he was infected with the C. jejuni bacteria. C. jejuni is very bad
for you. He probably ate something spoiled. My sister got
food poisoning once.
Answer:
Explanation:I would put argument 2, because C.jejuni is bad r
What’s the biggest molecule
Answer:
PG5
Explanation:
Hope this helps and have a great day!
If you were to use 3.50 mL of 0.250 M copper(II) sulfate in an experiment similar to the one you just
completed, what volume of 0.250 M sodium hydroxide would you need so that neither was a limiting
reactant? Justify your answer.
A tube containing 8.00 mL of 0.250 M copper(II) sulfate (CuSOs) contains 2.00 x 10 mole of
coppen II) sulfate. How many grams of solid copper(II) sulfate would this be equivalent to? Show
your work using dimensional analysis.
6.
How many moles of sodium hydroxide would be needed for a complete reaction with 4.80 x 10- mole
-
11
Answer:
a. volume of NaOH needed = 0.07 L or 7.0 mL since mole ratio of CuSO₄ to NaOH is 1 : 2
b. mass of copper (ii) sulfate = 0.32 g
c. Number of moles of NaOH needed, Y = 9.6 * 10⁻¹¹ moles of NaOH
Explanation:
The equation of the reaction is as follows:
CuSO₄ (aq) + 2NaOH(aq) —> Na₂SO₄ (aq) + Cu(OH)₂(s)
Number of moles of CuSO₄ in 3.50 mL of 0.250 M solution
number of moles = molarity * volume
number of moles = 0.250 M * 3.50 mL * 1L/1000 mL = 0.000875 moles
since mole ratio of CuSO₄ to NaOH is 1 : 2,
number of moles of NaOH required = 2 * 0.000875 = 0.00175moles
volume of NaOH required = number of moles/molarity
volume = 0.00175/0.250
volume = 0.07 L or 7.0 mL
b. number of moles = molarity * volume
number of moles = mass/molar mass
molar mass of CuSO₄ = 160 g/mol
number of moles = 0.250 mol/L * 8.00 mL * 1 L/1000 mL
number of moles = 2.00 * 10⁻² moles
2.00 * 10⁻² moles = mass/160 g/mol
mass = 2.00 * 10⁻² moles * 160 g/mol
mass = 0.32 g
c. Mole ratio of CuSO₄ to NaOH is 1 : 2
let number of moles of NaOH be Y
1 mole of CuSO₄/2 moles of NaOH= 4.8 * 10⁻¹¹ moles of CuSO₄/ Y
Y = 2 moles of NaOH * 4.8 * 10⁻¹¹ moles of / 1 moles of CuSO₄
Y = 9.6 * 10⁻¹¹ moles of NaOH
The smallest of the -2 ions?
Answer:
Ionic radius increases down the group, therefore Li+ ion has the smallest ionicsize out of the three ions.
tpt Cell theory has three parts: The cell is the basic unit of life in all living things, all cells come from existing cells, and
Answer:
All cells come from cells.
Explanation:
Basically meaning that the cells just infinitely reproduce themselves.
5. View the image below and answer the question.
Answer:
where is the question?
how many moles are in 28.65 grams
Answer:
There are 0.24952533574875027 moles for 28.65 grams.
Explanation:
1 gram = 0.0087094358027487 mole
Which chemical formula shows a covalent compound?
NaCl
HBr
MgO
CO2
Answer:
CO2
Explanation:
A covalent compound is a compound between 2 nonmetals. For this reason, NaCl and MgO can be eliminated since both contain metals. While neither H nor Br are metals, in HBr H is acting as a metal. CO2 is the only choice containing both nonmetals, with both elements acting like nonmetals as well.
Bobby claimed that because bubbles are formed when boiling water it must be a chemical change. He argued that a gas is being created, which is a sign of a chemical change. Evan disagreed, saying that that it did not change into a different substance and was thus a physical change. Who do you agree with? Explain your reasoning
Answer:
I disagree with Evan's explanation for chemical change with regards to formation of bubbles.
Explanation:
Chemical change usually affects the chemical composition, whereas physical change only affects the appearance of the substance and is easily reversible.
The bubbling water is just going through change of phase, but its overall chemical composition isn't altered, Hence, it is a physical change, and not chemical.
I hope this was easy to understand.
In a home, what would cause air to cool and sink? and what would make that cooler air actually rise again?
Identify arrows pointing to structures containing sigma bonds.
Answer:
Identify arrows pointing to bonding electrons.
✔ a, b, d
Identify arrows pointing to nonbonding electrons.
✔ c
Identify arrows pointing to structures containing sigma bonds.
✔ a, b, d
Identify arrows pointing to structures containing pi bonds.
✔ a
Explanation:
Answer:
1) option c 2) c 3) option b 4) a
Explanation:
How many liters are in 17.5 g of potassium sulfate?
Answer:
66.24 liters
Explanation:
Solar cells can be used to power calculators and cars, and to heat buildings. T or F
Answer:
True
Explanation:
PLEASEEE HELP SCIENCE A cold front forms when cold, dense air moves under warm, less dense air, as shown in the
following illustration. Cooler weather usually follows a cold front. Cold fronts often bring other weather
changes.
A football field is 100 m long. If it takes a player to run the field 30 seconds what is
their speed
Answer:
The answer is 3.33 m/sExplanation:
The speed of an object can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
where
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{100}{30} = \frac{10}{3} \\ = 3.333333...[/tex]
We have the final answer as
3.33 m/sHope this helps you
Which statement best compares pure substances to mixtures?
Pure substances contain small amounts of impurities. Mixtures contain large amounts of
impurities.
Pure substances must be made of two chemical materials. Mixtures can be made of only one
chemical material.
Pure substances are either compounds or elements. Mixtures are homogeneous or
heterogeneous combinations.
Pure substances are liquids dissolved in liquids or gases dissolved in gases. Mixtures are
gases dissolved in liquids or solids dissolved in liquids.
Answer:
pure substances contain small amount of impurities . mixture contain large amounts of impurities
Pure substances are either elements or compounds while mixtures are homogeneous or heterogeneous combinations.
What is Pure substance and mixture?Elements are pure substances as they cannot be broken down into simple substances by any chemical or physical methods as they have only one type of atom in the whole composition.
A pure substance is composed of two or more elements that are chemically combined in a definite proportion. That type of pure substance is called a compound. Water is a pure compound made up of a combination of oxygen and hydrogen.
A mixture is composed of two or more different types of substances which are physically combined. A mixture can separate back into its original components. These types of impure substances are also referred to as mixtures.
A mixture can be either homogeneous or heterogeneous. Cement is a calcium compound solid it is considered a homogeneous mixture while famous gaseous heterogeneous mixes such as cologne and perfume.
Therefore, statement (C) best compares pure substances to mixtures.
Learn more about pure substances and mixtures, here:
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Which of the following statements concerning the
melting of ice, which occurs in segment BC, is true?
rections: Use the graph below to answer any questions
t follow
OA. The particle motion decreases.
Heating/Cooling Curve for Water
o
B. The particle motion is unaffected.
o
C. The temperature increases throughout the
phase chang
D
E
100-
Temperature
O D. The temperature stays the same until all the
ice has melted.
B
00+
C
А
Energy Added as Heat
Answer you need an right amout of fecal matter
h
Explanation:f ///////////////////////////////////////////c/v
Answer:
D
Explanation:
what is the voltmeter reading this time?
What do you think the study of chemistry might be about?
Answer:
Think about it. Chemistry is the study of matter.
Explanation:
Anything that has mass and takes up space, and the changes that matter will have when it is in different environments or conditions. Chemistry is used everyday with the development of plastics, wood burning, prescriptions, cosmetics, etc. Everything you touch is made of an element. there's 5 branches of chemistry including Biochemistry, organic chemistry and physical chemistry. -(you find the others).
Chemistry studies our surroundings on a molecular level through atoms and molecules with chemical reactions and understanding the specific properties. There are patterns on the periodic table you should check out.
good luck and have fun!
Answer:
chemistry is the study of structure of substance and what happens to them in different conditions
HELP!!
How is the Earth's interior characterized? and provide a real-world example
Answer:
FREE POINT!!!!!!!!
Explanation:
How am i cool to you
Answer:you are a fantastic person! i love your avatar. And...this gave me extra points so thank you!
Arrange K, Li, and Cs in order of increasing atomic size please
Answer:
Li,K,Cs
Explanation:
Nitrogen boils at -195°C, because it is normally a gas at room temperature. At -250°C, it is a: solid, liquid, gas
Answer:
i think its liquid because they is liquid nitrogen and the gas but i think its liquid
1. A peep with volume 180 cm is placed in a vacuum pump with a pressure of 0.9 atm. If the
pressure is dropped by the pump to 0.030 atm, what will the new volume of the peep be?
P
V
T
Initial
0.9atm
180cm3
Final
0.030atm
Effect
Answer:
V₂ = 5400 cm³
Explanation:
Given data:
Initial volume = 180 cm³
Initial pressure = 0.9 atm
Final pressure = 0.03 atm
Final volume = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
0.9 atm × 180 cm³ = 0.030 atm × V₂
V₂ = 162 atm.cm³ / 0.030 atm
V₂ = 5400 cm³