Answer:
The answer is D) Magnesium
Explanation:
Because smog is a mixture
sea water is a mixture
air is an element
And salt solvent
It can only be D
Which of the following is a fossil fuel?
A. oil
B. Copper
C. aluminum
D. Cattle
Answer: oil
The answer is A, oil. Oil is one of the most popular fossil fuels. You probably did not know the answer was fossil fuels. The answer is oil.
Hope this helps you!
A sample of 4.0 mol of neon gas at a pressure of 2.5 atm is injected into a container at
25°C. What is the volume of the container?
Answer:
The volume of container is 39.14 L.
Explanation:
Given data:
Number of moles of neon = 4.0 mol
Pressure of gas = 2.5 atm
Temperature of gas = 25°C
Volume of container = ?
Solution:
we will use general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
Now we will put the values in formula.
2.5 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K × 298 K
V = 97.86 atm.L /2.5 atm
V = 39.14 L
The volume of container is 39.14 L.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
7.2 / 2.4 = 3 half-lives
(1/2)3 = 0.125 (the amount remaining after 3 half-lives)
100.0 g x 0.125 = 12.5 g remaining
A cylinder container can hold 2.45L of water. It’s radius is 4.00 cm. What is the volume of it in cubic centimeters?
Answer:
boiiiiiiiiiii
Explanation:
What is the volume of 3.0 grams of lead?
Answer:
it should be 0.01
Explanation:
Recall all the models you described in task 1. Think about the results each model would predict for Rutherford's experiment. Which atomic models does Rutherford's experimental evidence support? Explain why these models are compatible with the experimental results.
The question is incomplete; the complete question is:
Recall all the atomic models you described in task 1. think about the results...
Recall all the atomic models you described in task 1. think about the results each model would predict for rutherford’s gold foil experiment. which atomic models does rutherford’s experimental evidence support? explain why these models are compatible with the experimental results.
the models in task 1 were dalton's, thomson's, rutherford's, and bohr's.
Answer:
Bohr's
Explanation:
Rutherford's theory laid the foundation upon which Bohr's model is founded. Rutherford established the fact that at the center of the atom, there is a nucleus whose radius is smaller than the radius of the atom. This nucleus is positively charged and most of the mass of the atom is concentrated there. Electrons move round this nucleus in orbits.
The experimental evidences of the Bohr's model shows that Rutherford's model was fundamentally correct. However, Bohr's model introduced the idea of quantization of the energy of electrons in an atom. The model went further to explain the spectra lines of the hydrogen atom.
Ionic compounds can conduct electricity in
Answer:
Solution and the liquid state
Explanation:
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One particular snake, say a rattle snake or a cobra, doesn't always look the same. Describe three different ways a rattle snake or a cobra, or another snake of your choosing might appear depending on where it is and what it's doing. What makes the appearance of the snake different in each situation? How you would know in spite of the differences that it is a snake of a particular type?
Explanation:
Both cobras and rattlesnakes are dangerous snakes. Both snakes deliver fatal bites to humans. but their venoms are of different type.
Cobras are long slender snakes, they usua grow between 4 and 6 feet, although they are other species which grow up to 18 to 24 feet. a Cobra can be identified with its most common features 1.hood behind their heads.
While a rattle snakes gives a warning sign when approaching this sound is known as rattle.
A bond between a nonmetal and a nonmetal is called a(n)
bond.
A. hydrogen
B. metallic
C. covalent
D. ionic
Answer:
answer: B
Explanation:
becaucse it is B
A bond between a nonmetal and a nonmetal is called a covalent bond. The correct answer is option C.
Covalent bonding occurs when two nonmetal atoms share one or more pairs of electrons in order to achieve a stable electron configuration.
This type of bond is characterized by the sharing of electrons between the atoms, rather than the transfer of electrons as in ionic bonding.
An example of a covalent bond between two nonmetals: The bond between two oxygen atoms in an [tex]\rm O_2[/tex] molecule. In this molecule, the two oxygen atoms share two pairs of electrons to form a stable covalent bond.
Therefore, option C. Covalent bond is a bond between a nonmetal and a nonmetal.
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All matter has a distinct melting and boiling point that we can use to describe it. Look at these thermometers. They show the temperatures at which each type of matter change from solid to liquid to gas. Use these thermometers to answer the questions on this worksheet.Preview the document
Answer:
Química orgánica
Explanation:
Which factors are needed for organisms to live earth
Answer: sunlight, water, air, habitat, and food.
Explanation: we are all living organisms and we all have our five basic necessities for survival; sunlight, water, air, habitat, and food.
Which is one precaution to take when working with heat and fire?
Do not use during experiments.
Keep flammables away.
Avoid touching face and eyes.
Do not mix chemicals unless told to do so.
why is the heating loop in the electric kettle at the bottom of the kettle?
Answer:
The heating element is near the bottom of the kettle because of the way it heats up the water. The water is heated through the flow of electricity meeting resistance in the form of the element.
Explanation:
A bar of metal with a volume of 12.0 cm^3 has a mass of 136 g. What us the density of this metal?
Answer:
The answer is 11.33 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 136 g
volume = 12 cm³
We have
[tex]density = \frac{136}{12} = \frac{34}{3} \\ = 11.333333...[/tex]
We have the final answer as
11.33 g/cm³Hope this helps you
A scientist heats a 300-g sample of iron from 30°C to 50°C. How much heat did the iron absorb.
The specific heat capacity of iron is 0.45 J/gºC.
Оа
Oь
Ос
Od
3,000)
2,700)
202,500)
2,500)
Answer:
d
Explanation:educated guess
Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 2196
oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?
Answer:
homogeneous mixture
Explanation:
The correct classification for air is a homogeneous mixture.
What is a Mixture?Material is referred to as a mixture when two or more chemicals combine without undergoing a chemical reaction.
Heterogeneous and homogeneous mixtures are the two types of mixtures.
While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components.
A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.
Mixtures are composed of two or more different substances that have not been chemically mixed. The following is a list of mixture properties.
Each of the components in a mixture retains its unique features.
Component separation is simple to carry out.
The component's relative weights vary.
The classification for air is 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases.
This classification for air has the properties of a homogeneous mixture.
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What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s
Answer:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?1,5625J
Who uses petroleum and for what purpose?
Answer:
today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.
Explanation:
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Which rule or principle does this violate?
A. Aufbau Principle
B. Pauli Exclusion Principle
C. Hunds rule
Answer:
Hunds rule is violated here.
Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.
Which element will be more reactive - Mg (magnesium) OR Se (Selenium)? *
Answer:
magnesium
Explanation:
magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive
1. What are physical and chemical properties of metals, nonmetals, and metalloids?
will someone help me, marked as brainiest
Answer:
C
Explanation:
Answer:
c.metal
Explanation: metal is able to carry heat
In 1897, Joseph Thomson discovered that atoms contained electrons. He proposed a change in the atomic theory of that time, and the theory was modified because of his discovery. Since Thomson's discovery, atomic theory has been further modified. What is the best explanation for why scientific theories are modified?
Answer:
because it is a theory
Explanation:
The best explanation for why scientific theories are modified is simply because it is a theory. Theories are created as a set of suppositions that help humanity understand something that would otherwise be unexplainable. Since they are not proven through scientific facts but instead are more of ideas that help further our understanding of a phenomenon, they tend to be modified as new ideas are introduced and others are proven to be false/wrong.
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What do phytoplankton do for the carbon cycle? Choose all that apply.
A. They take in oxygen for photosynthesis.
B. They take in carbon dioxide for photosynthesis.
C. When they die, the carbon left in them can be sequestered (stored) in the ocean bottom.
D. They are food for many animals, including some whales.
Answer:
B is the answer
Explanation:
Curiosity is important in the progress of science because it
A. aids in the interpretation of data.
B. encourages new experimentation.
C. ensures the inclusion of different viewpoints.
D. allows a scientist to learn from others.
Answer:
B
Explanation:
because it makes you want to know what happens in an experiment
Answer:
B. encourages new experimentation.
Explanation:
right on EDGE 2021
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Which part of scientific design occurs when an experiment is conducted by more than one scientist to determine the validity of results?
A. replication
B. research
C. trials
D. variables
Answer: c
Explanation:
i think the answer is c
Which of the following is a physical blend of two or more substances with uniform composition? Select all that apply.
A. Homogeneous mixture
B. Heterogeneous mixture
C. Solution
D. Pure substance
Answer:
homogeneous mixture
Explanation:
A homogeneous mixture and Solution are the physical blend of two or more substances with uniform composition. Thus, options A and C are true.
What do you mean by Mixture?“Mixture is an act of combining two or more chemical substances that are not chemically linked.”
Types of mixtures –
There are two main types of mixture.
Homogeneous Mixture –
A Homogeneous Mixture is a mixture in which composition is uniform throughout the mixture, and it appears like a single substance.
Example – Air is a homogeneous mixture of gas etc.
Heterogeneous mixture –
A Heterogeneous mixture is a mixture in which composition is not uniform throughout the mixture.
Example – Vegetable soup is a heterogeneous mixture etc.
Solution –
A Solution is a homogeneous mixture of two or more solutes dissolved in a solvent.
Example – Solution of sugar in water etc.
Thus, a homogeneous mixture and solution are the physical blends of two or more substances with uniform composition. Thus, options A and C are true.
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how is dissolving different from melting
Answer:
Melting: one substance is involved and the liquid and solid are the same material.
To melt something heat is essential.
Dissolving: involves two materials;the resulting solution is a mixture of two substances.
The dissolved substance is still present in the solution even though it cannot be seen.
Explanation:
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Calculate the density of a piece of mass of metal. The rectangular piece of solid metal has the measures of 2.0 cm 3.0 cm in 2.0 is the unidentified
metal has a mass of 40
Answer:
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
Explanation:
volume = length × breath × height
let's take it as,
length = 2.0cm
breath = 3.0 cm
height = 2.0 cm
mass = 40 kg or g (since you didn't state the unit of the mass)
volume = ?
volume = length × breath × height
volume = (2 × 3 × 2)cm
volume = 12 cm³
Density = mass /volume
40kg or g/12cm³
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
which object would require the most amount of energy, or force, to set it to motion?
a. school bus
b. refrigerator
c. microwave
d. houseplant