I'm not sure what to do here...

Answer:

48.176 ×10²³ chloride ions

Explanation:

Given data:

Number of chloride ions = ?

Number of moles of CaCl₂= 4 mol

Solution:

One mole of CaCl₂ contain 2 moles of chloride ions.

CaCl₂      →     Ca²⁺ + 2Cl⁻

4 moles of CaCl₂ contain,

4 ×2 = 8 moles of chloride ions

Number of chloride ions:

1 mole = 6.022×10²³ ions

8 mol × 6.022×10²³ ions/ 1 mol

48.176 ×10²³ ions

Answer:

Os

Explanation:

Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

Among all the given options, uranium (U) is an inner transition metal. Inner transition metal are the metals that belongs to f block of periodic table as their last electron goes into f subshell.

Therefore, the correct option is option A.

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Answer:

ORANGE WAIT NO IM COLOR BLIND

Explanation:

Answer:

3

Explanation:

Step 1: RxN

Rb + P → Rb₃P

Step 2: Balance RxN

We will need 3 Rb's on both sides.

3Rb + P → Rb₃P

Ionization Trend: First ionization energy will increase left to right across a period and increase bottom to top of a family (column).

A) Sr, Be, Mg are all in column 2 of the periodic table. Based on the first ionization rule above, from increasing to decreasing energy, the order is: Be, Mg, Sr

B) Bi, Cs, Ba are all in the same row of the periodic table. Based on the first ionization rule above, from increasing to decreasing energy, the order is: Bi, Ba, Cs

C) Same rule as above. Order is: Na, Al, S

The elements in increasing order of ionization energy will be:

a) Be, Mg, Sr

b) Bi, Ba, Cs

c) Na, Al, S

Ionization Trend: First ionization energy will increase left to right across a period and decrease bottom to top of a family (column).

A) Sr, Be, Mg are all in column 2 of the periodic table. Based on the first ionization rule above, from increasing to decreasing energy, the order is: Be, Mg, Sr

B) Bi, Cs, Ba are all in the same row of the periodic table. Based on the first ionization rule above, from increasing to decreasing energy, the order is: Bi, Ba, Cs

C) Similarly, Order is: Na, Al, S

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The speed of the yacht : 100 km/h

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration  

the speed of vo = v = constant

acceleration = a = 0  

Δx = vt or x = xo + vt  

An equation of constant velocity motion  

[tex]\large {\boxed {\bold {x = v \times \: t}}}[/tex]

x = distance = m  

v = speed = m / s  

t = time = seconds  

A yacht sailed at a steady speed for 0.5 hours, and traveled 50 kilometers

so the velocity/speed:

[tex]\tt v=\dfrac{x}{t}\\\\v=\dfrac{50~km}{0.5~h}=\boxed{\bold{100~km/h}}[/tex]

Answer:

Between oxygen and selenium, oxygen is more electronegative because of more ionisation energy and small size

Explanation:

Answer:

We can either increase the frequency of the light source or decrease the wavelength of the light source in the simulation

Explanation:

When light approaches or strike a metal surface, we can observe electrons coming out the metal surface. So, when a light wave hits a metal surface, it becomes protons; thus, we can either increase the frequency of the light source or decrease the wavelength of the light source in the simulation.

Thus, a higher energy photon will strike the electron, and the electrons tend to gain energy from the photons.

Answer:

Explanation:The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation. It involves formulating hypotheses, via induction, based on such observations; experimental and measurement-based testing of deductions drawn from the hypotheses; and refinement (or elimination) of the hypotheses based on the experimental findings. These are principles of the scientific method, as distinguished from a definitive series of steps applicable to all scientific enterprises.[1][2][3]

Though diverse models for the scientific method are available, there is in general a continuous process that includes observations about the natural world. People are naturally inquisitive, so they often come up with questions about things they see or hear, and they often develop ideas or hypotheses about why things are the way they are. The best hypotheses lead to predictions that can be tested in various ways. The most conclusive testing of hypotheses comes from reasoning based on carefully controlled experimental data. Depending on how well additional tests match the predictions, the original hypothesis may require refinement, alteration, expansion or even rejection. If a particular hypothesis becomes very well supported, a general theory may be develope

Answer:

No

Explanation:

Fortunately, in this scenario, you are not out of luck. Each of these components has a unique trait that would allow you to easily separate them. For starters, you can separate all of the Iron with a strong magnet since iron has a magnetic field while sand and salt do not. Next, you can separate the salt and sand by adding water since salt will dissolve in the water leaving only the sand which is not soluble. Once the sand is removed you would simply need to distill the water/salt mixture which would separate the salt from the water. Now you have all three components separated and can get your wish.

Answer:

The answer is the second picture.

Explanation:

When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.

Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.

Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.

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Answer:

awsdxcvawsd

Explanation:

Answer:If you change the number of neutrons in an atom, you get an isotope of the same element. The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element.

Explanation:

Answer:

Physical property

Explanation:

If it is right then please rate my answer. also, brainlest would not hurt if it is the brainlest answer.....

Answer:

In 2H2SO4, the number of hydrogen atoms is (1,2,4,8) the number of sulfur atoms is (1,2,4,8) and the number of oxygen atoms is (1,2,4,8)

Explanation:

I've done this problem before, but I did it a month or so back so I'm not 100% sure but I'm pretty sure this is the correct answer. Hope this helps!

Answer:2 hydrogen atoms 1 sulfur atom 4 oxygen atom

hope I helped!

Answer:

sorry it's so tiny

Explanation:

Answer:

you need to put a choice if you want help add the possible answers

Explanation:

Answer: I looked at the periodic table and the element that lines up between the two is F which is Fluorine.

Explanation: I hope this helps!

The element in period 2 of group 17 is fluorine.

Fluorine is the most chemically reactive and electronegative of all the elements. It is a single-valent toxic gaseous halogen that is pale yellow-green in color. Even with the noble gases krypton, xenon, and radon, fluorine easily combines with the majority of other elements to generate new compounds.

Glass, metals, and even water, as well as other materials, burn with a brilliant flame in a jet of fluorine gas because it is so reactive. The fluoride ion F- is the most frequent form of fluorine in aqueous solutions. Fluorides are substances that contain fluoride along with a positively charged partner.

Fluorine is indirectly utilized in the manufacturing of uranium, low friction polymers like teflon, and halons like freon. Fluorochlorohydrocarbons are widely utilized in refrigeration and air conditioning.

Therefore, the name of the element is fluorine.

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Answer:

Digesting a sandwich because it cant be reversed.

The speed of a wave can be calculated using this formula:

v = f x λ

Where:

v is the wave speed in metres per second, m/s

f is the frequency in hertz, Hz

λ (lambda) is the wavelength in metres, m

Calculation:

Given:

f = 20 Hz

λ = 100m

Using the equation:

v = f x λ

v = 20 x 100

v = 2000 m/s

Therfore, the speed of the wave is 2000 m/s

A sound wave has a wavelength of 100 m and a frequency of 20 Hz. The wave's speed is 2× 10^3 m/s.

assuming frequency = 20 Hz and wavelength = 100 m

utilized concept: v= = 20×100 = 2×10³ m/s

The frequency in physics is the quantity of waves passing a fixed location in a unit of time. It also indicates how many cycles or vibrations a body in periodic motion experiences in a given unit of time.

A sort of energy created by vibrations is sound. The molecules of the air surrounding an item vibrate as a result.. These molecules vibrate because they collide with nearby molecules, which also vibrate as a result.

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Answer:

the answer is B

Explanation:

because its asking you the frequent summertime storms

hope it helps you

Answer:

b is your answer i'm sure of it :)

Explanation:

have great day :)

Answer: ik im late but I got b

Explanation:

A homogeneous mixture can be described as the solute uniformly dissolving in a solvent to make a solution. Therefore, option (B) is correct.

A mixture can be described as a combination of two or more substances that are not chemically combined with each other. Mixtures can be categorized into two kinds homogeneous mixtures and heterogeneous mixtures.

A homogeneous mixture can be defined as one whose whole composition is uniform throughout the entire mixture. It can be the type of mixture where the entire composition is constant throughout that make up the mixture and is distributed uniformly.

A homogeneous mixture can be described as a gaseous, liquid, or solid mixture that has equal proportions of its components throughout the sample. In a homogeneous mixture, there is only one phase of matter observed.

Some examples of Homogeneous Mixtures are Air Rainwater, Vinegar, Dishwashing detergent, Steel, Sugar water, a Cup of Coffee, etc.

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Answer:

Boiling water

Explanation:

The water evaporates from the pot

Answer:

Answer:

Explanation:

Beta radiations:

mass 1/200 , charge -1, medium penetration

Beta radiations are result from the beta decay in which electron is ejected.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminum is used to block the beta radiation

Properties of alpha radiation:

mass 4 amu, charge +2, least penetration

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Gamma radiations:

mass 0, charge 0, deepest penetration

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Answer:

C. 5 grams

Explanation:

The ratio is 2:1, which means everything on the right (B) will be half of the left (A). Since 10 is on the left, and half of 10 is 5, C is the answer

Answer:

A force is described as any influence that causes an object to undergo a change. Distance refers to how far an object travels over a period of time. The greater the force that is applied on an object the further distance that object will travel.

Answer:7

Explanation:

Answer:

its c

Explanation:

Answer:

sodium

Explanation:

Answer:

Ionic compounds are named with the cation first and the anion last. The same convention is used when writing their chemical formulas.

Explanation:

Distinguishing Between Pure Substances and Mixtures

Pure substances can be either elements or compounds. Mixtures can be either homogeneous or heterogeneous. ... Gasoline is thus a blend of different compounds, so it is a mixture.