According to the big bang theory, the universe—all of the stars, planets, and galaxies everywhere—began as a very small, dense mass. This mass expanded suddenly in an incredibly hot explosion-like event, and it has spent the last 13.7 billion years rapidly expanding and cooling.

In 1964, which of the following space technologies provided scientists with the best evidence that the universe was created in the big bang?
A.
a lunar module
B.
a Mars rover
C.
a radio telescope
D.
a weather satellite

Answer:

The mass of oxygen gas is 0.96 g.

Explanation:

Given data:

Mass of oxygen gas = ?

Volume of as = 320 mL (320mL × 1L /1000 mL = 0.32 L)

Temperature of gas = 17 °C

Pressure of gas = 2 atm

Solution:

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.

17+273 = 290 K

Now we will put the values in formula.

2 atm × 0.32 L = n × 0.0821 atm.L/ mol.K   × 290 K

0.64 atm.L =  n × 23.81 atm.L/ mol.

n = 0.64 atm.L / 23.81 atm.L/ mol.

n = 0.03 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.03 mol × 32 g/mol

Mass = 0.96 g

The mass of oxygen gas is 0.96 g.

The mass of oxygen will be "0.96 g".

Given:

Volume,

or,

           = 0.32 L

Temperature,

or,

           = 290 K  

Pressure,

General gas constant,

As we know the formula,

→ [tex]PV = nRT[/tex]

By substituting the values, we get

[tex]2\times 0.32=n\times 0.0821\times 290[/tex]

     [tex]0.64=n\times 23.81[/tex]

         [tex]n = \frac{0.64}{23.81}[/tex]

            [tex]= 0.03 \ mol[/tex]

hence,

→ Mass of oxygen = [tex]Number \ of \ moles\times Molar \ mass[/tex]      

                               = [tex]0.03\times 32[/tex]

                               = [tex]0.96 \ g[/tex]

Thus the above answer is right.

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Sulfur tetra flouride formula is SF4   so there are 3.07 moles of sulfur ATOMS in there.

Answer:

what

Explanation:

is this free points

Answer:

0.0199moles

Explanation:

The number of miles of a substance can be calculated using the formula:

Number of moles (n) = Mass (M) / Molar mass (MM)

In this question, the mass of Magnesium element (Mg) = 0.478 g while the atomic mass is 24

Therefore, number of moles of Magnesium is:

Moles = 0.478/24

Moles = 0.01992

Hence, 0.0199 moles of Magnesium are contained in 0.478 g of the element.

Answer: 41.97

Explanation:

Answer:

6.44 cups of ice

Explanation:

The ratio of the densities is simply the density of one divided by the density of the other: The density of ice to water is 0.92. Using the ratio, one can simply multiply the volume of the ice by 0.92, which is the conversion factor for the volume of ice to liquid water.

7 × 0.92 = 6.44

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Answer:

Melting point as a chemistry concept

The solid begins to go from a solid state to a liquid state — a process called melting. The temperature at which melting occurs is the melting point (mp) of the substance.

Answer:

Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.

Answer:

5=C, every action has an equal or opposite reaction,

6=B, since it has less air drag and more force exerted on it

7= You're correct

Answer:

sksksk

Explanation:

anna oop

Answer:

Try putting Dd okkkkkkkk

Answer:

70

Explanation:

density=mass/volume

therefore mass = density*volume

20*3.5=70

Answer:

pls complete your question

Answer:

CHEMIcal hiSToRY

Explanation:

Answer:

I think the first one is Active Transport.

Explanation:

The second one is passive transport

Answer:

A

Explanation:

Answer:

conduction (A) is the right answer

Answer:

In the nucleus.

Explanation:

Answer:

have the same number of protons

Explanation:

The number of protons in an atom determine what element it is. The number of electrons and neutrons can vary from atom to atom of the element, as long as all the atoms have the same number of protons.

Answer:

Nitrogen is a diatomic molecule in the VA family on the periodic table. Nitrogen has five valence electrons, so it needs three more valence electrons to complete its octet. A nitrogen atom can fill its octet by sharing three electrons with another nitrogen atom, forming three covalent bonds, a so-called triple bond.

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Answer:

Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell. Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.

The number of electrons in an atom's outermost valence shell governs its bonding behaviour. Elements whose atoms have the same number of valence electrons are grouped together in the Periodic Table. ... To form a covalent bond, one electron from the halogen and one electron from another atom form a shared pair.

The question is incomplete; the complete question is;

In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty with space with-

Protons orbiting a dense nucleus made of electrons and neutrons

Electrons orbiting a dense nucleus made of protons and neutrons

Neutrons and protons orbiting a cloud of electrons

Electrons and protons orbiting a cloud of neutrons

Answer:

Electrons orbiting a dense nucleus made of protons and neutrons

Explanation:

Rutherford established the nuclear theory of the atom by his famous experiment. In his experiment, alpha particles were used to bombard a thin gold foil and the movement of the particles was observed on a moveable zinc sulphide screen.

It was discovered from the experiment that the atom was mostly made up of empty space. The electrons orbit a dense nucleus comprising of protons and neutrons.

Answer:

Methane is an odorless, colorless, flammable gas. It is used primarily as fuel to make heat and light. It is also used to manufacture organic chemicals. Methane can be formed by the decay of natural materials and is common in landfills, marshes, septic systems and sewers

Explanation:

For the first question:

Use the formula: Density = Mass/Volume

Given in the question:

Mass - 1800 mg

Volume - 2 cm3

Calculation

Density = Mass/Volume

= 1800/2

= 900mg/cm3

Therefore, the density is 900mg/cm3.

Answer: D. Climate

Explanat

Answer:

Hello!!! Princess Sakura here ^^

Explanation:

The answer is Choice 3. the teacher will give you the most safe instructions according to how dangerous the blood might be.

Answer:

Should be Solute

Explanation:

I looked it up ;)

Answer:

c. Solute

Explanation:

Answer:

determination or brains

Explanation:

Answer:

Physical change is there is a difference in appearance, smell, etc.

Chemical change is there is change in the composition or the rearrangement of the atoms of one or more substances.