Answer:
The air in the room
Explanation:
The diffrent temp of the water compared to the room. The water was colder than the room.
If the half-life of Sulfate-12 is 18 years, how much of a 6 gram sample is left after 2 half-lives?
Answer:
The correct answer is - 1/4 0f 6 gram or 1.5 gram to be exact.
Explanation:
Given:
Half-life of sulfate-12 = 18 years
number of half-lives - 2
initial amount - 6 grams.
Solution:
The Half-life of an element or substance is the required time to decay the half amount of the initial amount of the element.
Remaining amount = initial amount * (1/2)^n
here n = number of half lives
then,
Remaining amount = 6* (1/2)^2
= 6/4
= 1.5 g.
Thus, the correct answer is = 1.5 g or 1/4 of 6 gram.
I need help with both of the questions fast plz!!!
Answer: SMALLEST is lithium
LARGEST is Fluorine
Explanation:
Q4. A grasshopper jumps at an angle of
30° to the horizontal with a take off
speed of 3m/s
1.
What is the height of its jump? (2)
II.
How long is it above the ground?
(2)
III.
What is the range of its jump? (2)
Answer:
i. The height of its jump is approximately 0.115 m
ii. The time of flight of its jump is approximately 0.306 seconds
iii. The range of its jump is approximately 0.795 m
Explanation:
The angle at which the grasshopper jumps, θ = 30°
The speed with which the grasshopper takes off, u = 3 m/s
i. The height of its jump 'h', is given by the following relation;
[tex]h = \dfrac{u^2 \times sin^2 \theta}{2 \times g}[/tex]
Where;
g = The acceleration due to gravity ≈ 9.81 m/s²
Therefore;
[tex]h \approx \dfrac{3^2 \times sin^2 (30^{\circ})}{2 \times 9.81} = \dfrac{25}{218} \approx 0.115[/tex]
The height of its jump, h ≈ 0.115 m
ii. The time of flight of its jump, 't', is given as follows;
[tex]The \ time \ of \ flight, \, t = \dfrac{2 \times u \times sin \theta}{ g}[/tex]
Therefore;
[tex]t \approx \dfrac{2 \times 3 \times sin (30 ^ {\circ})}{ 9.81} = \dfrac{100}{327} \approx 0.306[/tex]
The time of flight of its jump, t ≈ 0.306 seconds
iii. The range of the jump is given by the following projectile motion equation for the range as follows;
[tex]R = \dfrac{u^2 \times sin (2 \times \theta)}{ g}[/tex]
Therefore;
[tex]R \approx \dfrac{3^2 \times sin (2 \times 30^ {\circ})}{ 9.81} = \dfrac{41659} {52433} \approx 0.795[/tex]
The range of the jump, R ≈ 0.795 m.
Can someone help me please
Answer:
health issues and physical encounters
number of moles of sodium azide
Answer:
0.015382279644614 mole.
Answer:
yes this is the answer for that quaz
a. For the reaction 2H2 + 02→ 2H20, how many moles of water can be produced from 6.0 mol of oxygen? 2.0 mol b. 6.0 mol 12 mol d. 18 mol
Explanation:
from the equation 1 mole of O2 will give 2 moles of H2O then 6.0 moles of O2 will give x
6.0*2 moles/ 1 mole
= 12 moles
this implies that, 6.0 moles of O2 will give = 12 moles of water
Write a neutralization reaction to form the salt k2so4
H2SO4 + 2KCL ----------› K2SO4 + 2HCL
hope it helps you ♡♡
an atom has 19 protons and 20 neutrons. what is the atomic number with steps
Answer:
39
Explanation:
add em up
Which is most likely a physical change?
Answer:
Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Explanation:
Drag the tiles to the boxes to form correct pairs.
Match each chemical reaction with the type of reaction that best describes it.
Answer:
The way I just figured it out myself and made another acc to put the answer on :/
Explanation:
The temperature of a 95.4 g piece of copper decreases from 48°C to 25°C when the copper releases - 849 J of heat. What is the specific heat of copper?
What is Williamson's synthesis?
Answer:
The name of the reaction was coined after Alexander William Williamson developed it in 1850.Williamson Ether Synthesis is a reaction that uses deprotonated alcohol and an organohalide to form an ether. 1. Williamson Ether Synthesis usually takes place as an SN2 reaction of a primary alkyl halide with an alkoxide ion.
Explanation:
yeah
Why do nurses need to understand chemistry?
A. Chemistry helps them understand how germs transmit disease.
B. Chemistry helps them keep accurate health records.
C. Chemistry helps them understand how medicines work.
D. Chemistry helps them learn the parts of the body.
Option D. Chemistry helps them learn the parts of the body is the reason need to understand chemistry.
Why do nurses need to understand chemistry?
Chemistry exists as the branch of science that contracts with the properties, composition, and arrangement of elements and compounds, how they can vary, and the energy that exists released or absorbed when they change.
Nurses must utilize organic chemistry to determine how the bodies of their patients metabolized glucose, and how the body responds to it. On a more complex level, nurses must cause conclusions based on their knowledge of organic chemistry to help protect the lives of their patients.
Hence, Option D. Chemistry helps them learn the parts of the body is the reason need to understand chemistry.
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A solution contains 35.00 g of sodium chloride in 100. G of water at 45.0C. How could this solution be described
Answer:
It is unsaturated
Explanation:
A solution is said to be unsaturated when it contains less solute than it can normally hold at a given temperature.
The solubility of NaCl remains fairly independent of temperature hence the line for the solubility of NaCl remains fairly flat in the solubility curve.
The solubility of NaCl is about 36 g of NaCl in 100g of water. Hence a solution that contains 35.00 g of sodium chloride in 100 g of water at 45.0C is unsaturated.
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C 3 H 8 (g)+5 O 2 (g) 3 CO 2 (g)+4 H 2 O(l)
3.60d * m ^ 3 carbon dioxide is produced when a sample of propane is burned in 7.25d * m ^ 3 oxygen.
Calculate the volume of unreacted oxygen. Give your answer in cm^ 3
Answer:
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C3H8 (g)+5O2 (g) -> 3CO2 (g) + 4H2O(l)
Explanation:
From the balanced chemical equation, it is clear that:
1mol. of propane reacts with 5 mol. of O2 and forms 3 mol. of CO2.
In terms of volume, the above equation can be rewritten as:
1.0L. of propane reacts with 5.0L O2 and forms 3.0L of CO2.
Since,
[tex]1dm^{3} =1.0L[/tex]
3.60dm^3 of CO2 is formed from how many dm^3 of O2?
[tex]=>3.60dm^3 CO2 * \frac{5.0L O2}{3.0L CO2}\\=6.0dm^3 O2 \\=6.0L O2[/tex]
The volume of unreacted oxygen is:
[tex]7.25dm^3 -6.0dm^3\\=1.25dm^3[/tex]
The volume of unreacted oxygen is 1.25L or 1250cm^3.
Since,
1dm^3=1000cm^3.
Which term best describes Cl in the following reaction? (HELP ASAP)
2NH3 + (OCl)– → N2H4 + H2O + Cl–
A)
Reducing agent
B)
Oxidized
C)
Reduced
D)
Electrolyte
i'm thinking reduced maybe but not sure
Answer:
Yes it is reduced because ocl is the reducing agent
What is a likely result of an increase in average global temperatures on Earth?
A. More predictable weather
B. Rising sea levels
C. Fewer rainstorms and blizzards
D. Falling sea levels
Answer:
A.
Explanation:
Warmer temperatures can also lead to a chain reaction of other changes around the world. That's because increasing air temperature also affects the oceans, weather patterns, snow and ice, and plants and animals. The warmer it gets, the more severe the impacts on people and the environment will be.
Las levaduras son microorganismos usados en la industria alimentaria en diversos procesos, uno de ellos es la fermentación del azúcar para producir alcohol, tal como se representa en el esquema. LEVADURA + AZÚCAR + CALOR ⇒ Dióxido de carbono + alcohol ¿Por qué este proceso se considera una reacción química? *
Porque solamente hay un aumento de temperatura.
Porque el azúcar cambia de estado.
Porque el azúcar se transforma en otra sustancia.
Porque el alcohol se evapora rápidamente.
Respuesta:
Porque el azúcar se transforma en otra sustancia.
Explicación:
Consideremos el cambio representado en el siguiente esquema.
LEVADURA + AZÚCAR + CALOR ⇒ Dióxido de carbono + alcohol
¿Por qué este proceso se considera una reacción química?
Porque solamente hay un aumento de temperatura. NO. El aumento de temperatura no indica una reacción química. Porque el azúcar cambia de estado. NO. El azúcar no cambia de estado. Porque el azúcar se transforma en otra sustancia. SI. En una reacción química, unas sustancias (reactivos) se transforman en otras (productos). Porque el alcohol se evapora rápidamente. NO. La evaporación es un cambio físico.Why do you think there was a rush to mass-produce penicillin around the time of World War II?
Answer:
penicillin could protect mice against infection from deadly Streptococci.
Explanation:
Answer:
In 1940, Florey carried out vital experiments, showing that penicillin could protect mice against infection from deadly Streptococci.
the main group elements on the periodic table are only in which orbitals?
Answer: Abstract. The main group elements are classified as belonging to the s- and p-blocks in the periodic table. They range from gases such as fluorine and oxygen through nonmetals (e.g., boron, phosphorus, and sulfur) and semimetals (metalloids; e.g., germanium) to very reactive metals such as sodium and potassium.
Explanation:
I'll give brainliest. My group has been struggling to answer this. We just need a solid answer with work to pick up our grades at least.
How many grams of Al(OH)3 are produced from 3.00 g of AlCl3 with excess of NaOH?
Explanation:
here u go the Answer with the working:)
how many types of kinetic energies are there? is it 4 or 5 types?
Which of the following would eat a dead rabbit?
A)
carnivore
B)
scavenger
C)
herbivore
D)
omnivore
Answer:
Scavenger
Explanation:
Because scavengers feed on dead of decaying meat
Differentiate between compounds and mixtures using the particle model of
matter.
Answer:
compounds are substance which can be formed by chemically combining two or more elements.
mixtures are substance that are formed by physically mixing two or more substances
This chemical reaction follows the law of conservation of mass. CaO(s) + CO2(g) - CaCO3(s) How much CaCO, will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one place after the decimal point.
4.3 grams 2.2 grams 1.1 grams 3.9 grams
please answer quick!
Answer:
the answer is 1.1grams is the currect ans
According to the law of conservation of mass, 1.1 grams of calcium carbonate are formed if 2.2 grams of CaO are used for this reaction.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.If 56 g CaO gives 46.2 g calcium carbonate then 2.2 g CaO will give 2.2×46.2/56=1.1 g.
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Determine whether each statement describes an electromagnetic wave, a mechanical wave, or both types of wave.
The question is incomplete, the complete question is;
Which statement describes a difference between electromagnetic and mechanical waves?
A. Mechanical waves cannot be longitudinal, but electromagnetic waves can.
B. Electromagnetic waves cannot move particles, but mechanical waves can.
C. Electromagnetic waves do not require a medium, but mechanical waves do.
D. Mechanical waves do not transfer energy, but electromagnetic waves do.
Answer:
Electromagnetic waves do not require a medium, but mechanical waves do.
Explanation:
A wave is defined as a disturbance along a medium which transfers energy. Waves may be classified as mechanical waves or electromagnetic waves based on their medium of propagation.
A mechanical wave requires a material medium for propagation. An example of a mechanical wave is sound waves. Sound waves are propagated in air.
Electromagnetic waves do not require a material medium for propagation. They can travel through space. An example of electromagnetic waves is light waves.
Explain if the combination of iron and copper sulfate is an example of a chemical reaction. Use evidence and scientific reasoning to support your answer.
Describe the redox reaction Check all that apply
2Al(s) + 3ZnCl2(g) - 3Zn(s) + 2AlCl3(aq)
Aluminum atoms transfer electrons to chlorine atoms.
Zinc is reduced
Zinc is the reducing agent
The oxidation number of chlorine does not change,
Aluminum is oxidized
Answer:
Zinc is reduced, The oxidation number of chlorine does not change, and Aluminum is oxidized.
Explanation:
A car reaches 80 km/hr, then suddenly crashed into a concrete wall. Without a seat
belt, the crash test dummy slams into the car's dashboard because
A the crash test dummy's kinetic energy drops to zero
B the dashboard is pushed backwards into the crash test dummy
C the crash test dummy continues its motion until acted upon by an unbalanced
force
D Gravity is pulling the crash test dummy in the direction the car is moving
Answer:
C
Explanation:
inertia
inertia is the reluctance of an object at rest or moving to change its state of rest or motion
because the car was moving, the dummy moves with the speed of the car..so when the crash happened the dummy continued to move..it was feeling reluctant to come to rest so was moving
Which of these reactions shows simple chemical decomposition?
I2 + 2NaCl → 2Nal + Cl2
NaF + HCl → HF + NaCl
H2 + I2 → 2HI
2NaCl → 2Na + Cl2
Answer:
last option is the correct answer
Explanation:
you can see that the chemical NaCl is decomposed or broken into its components Na and Cl.
all other equations have formation of a new compound by reaction of 2 elements or compound
