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Answer:

considered as element

Helium He

Answer:

weight = Mass × gravity

P= m × g

P=mg

Weight (P) = ? , Mass (m) = 2 kg , gravity (g) = 9.8 m/s²

P= mg

p = 2 × 9.8

P= 19.6 kg.m/s²

P= 19.6 N

I hope I helped you^_^

Explanation:

Force=mass *acceleration

F=300*5

f

F=1500N

Answer:

There are various substances found in nature, which are classified as an element, compound, and mixtures. Elements are pure substances, which are found in the simplest form, compounds are formed by the combining of two or more atoms of the same or different elements. Mixtures are categorized into homogenous and heterogenous, which are based on the composition of the mixture.

Explanation:

The homogenous mixtures are defined as the mixtures in which substances or components are evenly distributed and cannot be distinguished by each other. For example, detergent, air, and water. Alloys are also considered homogenous mixtures because the elements are mixed in some particular ratio. For instance, brass and steel are such types of homogenous alloys. In brass, the solid solution of copper and zinc are mixed in a specific ratio (2:1). However, the different instruments have different ratios of brass. The brass is classified as a homogenous mixture. In contrast, heterogeneous mixtures are those in which the composition of substances is not uniform. For example, oil and water.

Answer:

3 ZnBr2(aq) + 2Al (s) ====>2AlBr3 (aq) + 3 Zn(s),

Answer:

1)Mixture is the combination of substance

2)There are two types of mixture such as heterogeneous mixture and homogeneous mixture

3)foreg=Salt solution ,sedimentation

Pure substance

1)Pure substances are also called elements

2)They are made up of small atoms

3)for eg= oxygen,Venadium ,Iron,Oxygen

Hey there! Here is the answer:

B.) decrease; increase

Here's why:

As you move from left to right across a period on the periodic table the size of an atom will decrease. As you move from top to bottom down a group on the periodic table the size of an atom will increase.

I really hope this answer helps you out! :)

Answer:

c

Explanation:

took test on usa testprep

When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.

A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in  emission of light.

When a potential  is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.

The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.

The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.

Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.

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Answer:

hydrocarbons contain both Hydrogen and Carbon while organic compounds

are compounds in which  one or more atoms of Carbon are  covalently linked

with  other elements

Explanation:

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Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.

The question is incomplete; the complete question is;

Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.

(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)

The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is [tex]9.32 * 10^9 Kg[/tex].

From the question, we know that;

Daily consumption of water per person = 150 gallons.

Population of the city = 100,000 people

Total daily city consumption =[tex]100,000 *  150 gallons = 15 * 10^6 gallons[/tex]

Annual water consumption = [tex]15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons[/tex]

1 gallon = 3.785 L = 3.785 kg

[tex]5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg[/tex]

Since sodium fluoride accounts for 45% by mass of water

Mass of sodium fluoride= [tex]0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg[/tex]

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Answer:

150 mL of 1.50 M HCL

Explanation:

So the equation you need to solve this equation is:

M1*V1=M2*V2 --> M1= Molarity of the acid you are diluting V1= Volume of the solution you need to dilute. M2=The molarity of thee solution you have made. V2=Volume of the solution you have made

M1= 1.50 M HCL

V1= Unknown

M2=0.450 M HCL

V2= 500 mL

Simple algebra says that V1= (1.5*500)/.450 = 150 mL of 1.50 M HCL

Answer:

what is the question????

Answer:

Basic oxides are oxides that show basic properties in opposition to acidic oxides and that either react with water to form a base; or react with an acid to form a salt and water which are called neutralization reactions.

Explanation:

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Explanation:

A basic oxide is an oxide that shows basic properties in opposition to acidic oxides and that either ⁕reacts with water to form a base; or ⁕reacts with an acid to form a salt.

Answer:

The correct choice is option b. ethanol < Mg(NO3)2 < NaCl

Explanation:

Ethanol = 0.100 m

Mg(NO3)2 = 0.15 m

NaCl = 0.18 m

The molar concentration of NaCl is the highest, which is why its boiling point will be the highest, too.

Answer:

III and V

Explanation:

Both of them are evenly spread homogenous mixtures.

The images that would be considered pure substances are III and V. Thus, the correct option for this question is A.

A pure substance may be defined as a type of substance or matter that has a constant composition and properties that are constant throughout the sample.

It is scientifically found that a pure substance is typically made up of only one kind of particle and has a fixed or constant structure. According to the given diagram, images III and V signify the even distribution of the same type of atoms of molecules within the substances.

Apart from physical properties, pure substances also shares identical chemical properties as well.

Therefore, the images that would be considered pure substances are III and V. Thus, the correct option for this question is A.

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Answer:

yes it is true they apply necessary safety measures

Answer: Label the test tubes, wear chemical protective gloves, tie long hair back

Explanation:

Just got it wrong

Answer:

the number of protons is called the atomic number

hope it helps you buddy

Answer: number of protons in an atom

Explanation:

Answer:

202.76 inches

Explanation:

1 meter = 39.37 inches

5.15 × 39.37 = 202.7559,when rounded it's 202.76

Answer:

d

Explanation:

solids the modicual are tightly packed

liquid, more room to move around  aka not so tightly packed

gas, can move where ever it wants  aka not paked at all

Answer:

5.029 × 100

Explanation:

Answer:

Gas pressure is caused when gas particles hit the walls of their container. The more often the particles hit the walls, and the faster they are moving when they do this, the higher the pressure. This is why the pressure in a tyre or balloon goes up when more air is pumped in.

Total distance=60m+40m=100m

Total Time=6+4=10s

#a

[tex]\boxed{\sf Speed=\dfrac{Distance}{Time}}[/tex]

[tex]\\ \sf\longmapsto Speed=\dfrac{100}{10}[/tex]

[tex]\\ \sf\longmapsto 10m/s[/tex]

#b

Displacement=AC=60m

[tex]\\ \sf\longmapsto Velocity=\dfrac{Displacement}{Time}[/tex]

[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{10}[/tex]

[tex]\\ \sf\longmapsto 6m/s[/tex]

#C

Distance=60m

time=5s

[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{5}=12m/s[/tex]

#d

The velocity of A to C is greater than Velocity from C to A

Answer: Three liquids that could fill a bowl with clear liquid in your kitchen could be alcohol, dish soap, juice (without pectin or pulp), sports drinks, and water (carbonated, coconut, flavored, or plain).

Answer:

yes

Explanation:

Hello! here is a paragraph you can use, that I type up to explain, make sure to not copy word for word of what I said. :)

What I use to wash up is soap. Soap has a certain ph level and includes acids and alkaline that enables water to mix and create soap foam to clean.  Soap can come in many shapes and sizes, and can be either liquid, solid, or even foamy. I think soap works because when you use friction between your wet hands and the soap bar, you are rubbing the substances of the soap that clean your hands to clean your hands. I think the friction of the rubbing creates a layer of soap that can be used to clean, and when you increase friction the more change of the soap.

Have a great day,

I hope this helps!