Lewis Dot Structure for Helium
(He)

Complete Question:

This diagram shows a marble with a mass of 3.8 grams (g) that was placed into 10 milliliters (mL) of water. Using the formula V M D = , what is the density of the marble?

(See attachment for full diagram)

Answer:

1.27 g/cm³

Explanation:

First, find the volume of rock:

Volume of rock = volume of water after rock was placed - volume of water before rock was placed

Volume of rock = 13 - 10 = 3ml

Density of rock = grams of rock per 1 cm³

Note: 1 ml = 1 cm³

Let x represent amount of rock per 1 cm³

Thus,

3.8g = 3 cm³

x = 1 cm³

Cross multiply

1*3.8 = 3*x

3.8 = 3x

3.8/3 = 3x/3

1.27 = x

Density of rock = 1.27 g/cm³

Answer:tbh idek i have a diff one

Explanation:

Answer:

Explanation:its catbony

The most abundant gas making up Earth’s atmosphere is nitrogen and 21% of of Earth’s atmosphere is comprised of oxygen.

An atmosphere meaning  'vapour, steam', and  is a layer of gas or layers of gases that envelop a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.

A stellar atmosphere is the outer region of a star, which includes the layers above the opaque photosphere; stars of low temperature might have outer atmospheres containing compound molecules.

The layered composition of the atmosphere minimises the harmful effects of sunlight, ultraviolet radiation, the solar wind, and cosmic rays to protect organisms from genetic damage. The current composition of the atmosphere of the Earth is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms.

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Data analysis is a process of inspecting, cleansing, transforming and modeling data with the goal of discovering useful information, informing conclusions and supporting decision-making

Answer:

An amide may be produced by reacting an acid chloride with ammonia.

Answer:

ammonia

Explanation:

An amide may be produced by reacting an acid chloride with ammonia. An amide may be produced by reacting an acid chloride with ammonia.

Answer: The sun is closer to the Earth is the summer and farther in the winter causing it to be hotter than it is colder in the summer and vise versa for the other question.

Explanation: I learned it ;)

Explanation:

The earth is tipped on its axis, 23.5 degrees in respect to the sun. In the summer time, the northern hemisphere has slightly more hours of daylight because of this, becoming more extreme as one goes north. If you go far enough north, there is 24 hours of sunlight in high summer.

So the average temperature is higher, because there is sunlight is present for more hours and the earth is warmed on balance.

At the same time, the south pole is in shadow, so the southern hemisphere has winter in June.

Six months later, the 23.5 degree tilt has the north pole facing away from the sun, and with fewer daylight hours, the temperature cools progressively. Meanwhile, the southern hemisphere is having it’s summer in December.

Answer:

an equal number of atoms

Explanation:

One mole of a substance contains the Avogadro's number of elementary entities (Atoms, molecules,  ion, etc).

Hence, one mole of calcium and one  mole of neon will contain exactly the same number of atoms which is 6.02 *10^23 atoms. This is known as the Avogadro's number.

Comparing 1 mole of Neon to 1 mole of calcium, both substances contains  

6.0221 x 10²³  atoms.

The atomic number of neon is 10 and the atomic number of calcium is 20.

The atomic number of an atom is the number of proton of an atom.

1 mole of Neon can be represented as follows

Ne

1 mole of Calcium  can be represented as follows:

Ca

Avogadro's number, or Avogadro's constant, is the number of particles found in one mole of a substance.

This experimentally determined value is approximately 6.0221 x 10²³ particles per mole.

This means 1 mole of any substance contain 6.0221 x 10²³  atoms.

Comparing 1 mole of Neon to 1 mole of calcium, both substances contains  

6.0221 x 10²³  atoms.

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Answer:

No, it is not.

Explanation:

Answer:

b or d

Explanation:

Answer:

Explanation:

During α-decay, an atomic nucleus emits an alpha particle. ... Note that the sum of the subscripts (atomic numbers or charges) is the same on each side of the equation. Also, the sum of the superscripts (masses) is the same on each side of the equation.Jul 29, 2014

Answer:

df

Explanation:

fawfe

Answer:

yes it is

hope it helps you

Answer : b. mixture

Element and compound are included in pure substance where the composition is the same in each part

Elements are made up of 1 type of atom, while the compounds of 2 or more types of atoms , both can be represented in the form of chemical symbols

A mixture is a combination of substances. The properties of a substance in the mixture component are unchanged

The mixture can be a homogeneous mixture or a heterogeneous mixture

Solution including into Homogeneous mixture, while suspension into a heterogeneous mixture

So a term that could refer to heterogeneous matter : b. mixture

Answer : 58.44 g

The reaction

[tex]\tt Na+Cl\Rightarrow NaCl[/tex]

mole ratio :

Na : Cl : NaCl = 1 : 1 : 1

Molar mass of Na : 22,989769 g/mol = 22.99 g/mol

Molar mass of Cl : 35,453 g/mol= 35.45 g/mol

Molar mass of NaCl : 58,44 g/mol

Let's check the mol for reactant (Na and Cl) and product(NaCl)

[tex]\tt mol=\dfrac{22.99}{22.99}=1[/tex]

[tex]\tt mol=\dfrac{35.45}{35.45}=1[/tex]

Then the reactants are completed reacting because it matches the mole ratio, which is 1: 1

so that the mole of the product can be determined from the mol Na or Cl, which is 1

[tex]\tt =\dfrac{mol~NaCl}{mol~Na}\times MW~NaCl\\\\=\dfrac{1}{1}\times 58.44\\\\=\boxed{\bold{58.44~g}}[/tex]

Answer:

flammable

that's the first thing that popped in my head

Another term for the ability to burn is combustibility. Combustibility refers to the ability of a substance to ignite and burn in the presence of oxygen.

Combustibility is a property that varies among different materials.When a substance is combustible, it means that it can undergo a chemical reaction called combustion, which involves the combination of the substance with oxygen to produce heat, light, and often smoke or flame. Combustion is a rapid oxidation process that releases energy in the form of heat and light.

Examples of combustible materials include wood, paper, gasoline, and natural gas. These substances have the ability to burn when exposed to a spark, flame, or heat source.

It is important to note that not all materials are combustible. Some materials, such as metals, may be non-combustible and do not easily catch fire.

It also allows us to take appropriate precautions when handling and storing combustible substances to prevent accidents and fires.

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Answer:

A) Paired

Explanation:

hdhwmenrnbdbd

Answer: it’s A

Explanation:

Answer:

I not understand your questions

Answer:

i think is A.

Explanation:

Answer:

the number of neutrons for silicon is 14

Answer:

It produces carbon dioxide when an Alka-Seltzer tablet dissolves in water. In the bath, the carbon dioxide dissolves and then emerges as a gas from the solution.

This carbon dioxide gas has mass, but it escapes from the container and diffuses into the atmosphere because it is a gas.

The mass loss from the container is directly calculated by the analytical balance.

2. Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons.

3. Electrons

4. Titanium- Ti

5. a. e and p = 35, n = 45

b. e and p = 46, n = 60

c. e and p = 55, n = 78

6. Barium - atomic number = 56 and mass = 138

Hope it helps :)

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Answer:

i believe this is ur answer-138

Explanation:

hope this helps :)

Answer:

A-cycles of the moon

Explanation:

The people of Ancient Greece, Rome and China counted their year based on a 12 moon cycle ( that is, about 354 days). A 13th cycle of the moon is included so that the lunar year remains in step with the seasons of the year.

Today, the Gregorian calendar is mostly used around the world. This calendar was

actually adapted from an earlier lunar version. Ancient civilizations used the phases of the moon to help identify the seasons.

The major difference between the lunar calendar and the solar calendar is the kind of celestial body that is used to determine time.

Answer:

False

Explanation:

Temperature is a measure of the average kinetic energy of the particles of a substance.

Answer:

C the number and placement of the electrons

Explanation:

Elements react with one another because they want to achieve a full valence shell of electrons. The noble gases already have a full valence shell of electrons, so they are unlikely to react with other elements.

Answer:

nitrogen has an ionization energy of 1400 kJ/mol while carbon has an energy of 1086 kJ/mol. Therefore as expected, nitrogen has higher energy than carbon.

Answer : The correct option is (C) each picture represents an isotope of lithium because they each have 3 protons.

Explanation :

Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.

As in the given picture, the number of protons are same but number of neutrons are different.

As we know that atomic number is either equal to number of protons or electrons for neutral atom.

The number of protons in the given picture are 3.

So, the element will be lithium with atomic number 3 and all are the isotopes of lithium.

Hence, the correct option is (C) each picture represents an isotope of lithium because they each have 3 protons.

Answer:

its a

Explanation:ok

Answer: D. Are the first to receive energy from a plant.

Explanation: Paying attention to the trophic level in which the food chain occurs is key. Producers are the ones that receive energy directly from the sun. They also make their own food using photosynthesis. A decomposer is the one who breaks down dead matter into chemical nutrients. Therefore, Primary consumers are the first to receive energy from a plant.

I hope this helped!

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