Part A
Look at the graphical display for the group 1 elements. What pattern do you observe about atomic radii as you move from
ydrogen at the top of the table to francium at the bottom?

in digital signals, codes are used while in analogue signals do not use signals.

Signals are defined as the instructions which are transferred to another source in other to deliver a message.

There are two types of signals which include the digital and analogue signals.

The digital signals uses codes which is a secret way of sending messages while analogue doesn't use codes.

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The molecular formula CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

Organic compounds are compounds that are obtained from organic materials.

The most common organic compound are the hydrocarbons,

The hydrocarbons includes the alkanes, alkenes, alkynes, etc.

The given compound CH₃CH(CH₃)₂ is the condensed formula for the hydrocarbon methylpropane.

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Answer:

green n yellow and white and black and white sq

If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].

Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.

Barium is a metal element and Nitrogen is a non-metal element, so they form an ionic compound. To make the formula of an ionic compound, first, we need to see the valence of the atoms, that is, how many electrons it can donate or it has to gain to have 8 electrons in the valence layer (octet rule).

Barium is in family 2, so it has two electrons in its valence layer, so it must donate these two electrons; Nitrogen is in family 15, so it has 5 electrons ins its valence layer and must gain 3 electrons.

Writing the ions they must form:

[tex]Ba^{+2}N^{-3}[/tex]

First came the cation (positive charge), then the anion (negative charge), and the charges must change between them, without the signal, and will inform how many atoms are necessary for which element:

[tex]Ba_3N_2[/tex]

Hence, If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].

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The mass of  2.75 ×   [tex]10^{-4}[/tex]moles NaOH will be 1.1 x  [tex]10^{-2}[/tex] grams

Recall that:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, the mole is  2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.

Mass =  2.75 ×  [tex]10^{-4}[/tex]x 40 = 1.1 x  [tex]10^{-2}[/tex] grams

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Answer:

Answer is option B or:

1.10 x 10–2 g NaOH

Explanation:

hope this helps! (edge)

Answer:

Ionic compounds do not exist in independent molecular form

-Lexi

A person who eats three servings of the cereal without milk will consume about 117 percent of calories.

This is defined as  a unit of energy and is commonly used in the body system.

One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.

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Answer:

0.5 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 2.00/4 = 0.5 M

Answer:

The periodic table

Explanation:

As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.

When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.

example. Find the molar mass of

H₂SO₄

Hydrogen (2) + sulphur (1) +oxygen (4)

= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)

=1(2) + 32(1)+16(4)

=2+32+64

=98

N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript

At STP 1 mole of gas occupies a volume of 22.4 liters. So 3.3moles of gas at STP7 will theoretically occupy 22.4*3.3-74 liters

Answer:

Y E S

Explanation:

Hibiscus tea has plenty of skin care qualities, from helping your natural levels of collagen and elastin to reducing breakouts to balancing oil production. Hibiscus is known for its rich level of antioxidants, including vitamin C and beta-carotene.

I hope this helps ✍(◔◡◔)

Answer:

Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.

Answer:

C

Explanation:

just did it

The molarity of the potassium acetate solution given the data is 1.584 M

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of CH₃COOK = 19.4 / 98

Mole of CH₃COOK = 0.198 mole

Molarity = mole / Volume

Molarity of CH₃COOK = 0.198 / 0.125

Molarity of CH₃COOK = 1.584 M

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Answer:

See below ~

Explanation:

The respective pairs are :

× Ribose ⇒ The sugar of RNA

× Double helix ⇒ Structures of DNA

× Watson & Crick ⇒ Proposed the double helix model

× Base pair ⇒ Adenine - Thymine pair

× Cytosine ⇒ The nucleotide pair of Guanine

Answer:

14

Explanation:

sun normal persentage is 14

Answer:Methane(CH4) and dioxygen(O2) are the reactants

Carbon dioxide(CO2) and water(H2O) are the products

Explanation:

Answer:

the answer to the qustion is 0.013089701 na

Explanation:

n/a

Answer:

A Dendrologist! They are the type of Scientist that studie trees.

The volume of CO2 prodiced when 12 mL of CH4 and 8 mL of C4H10 is burnt is 56 mL.

The equation of the combustion of C2H6, CH4, C4H10, and C3H8 gases are given below:

2 C2H6 + 7 O2 ---> 4 CO2 + 6 H20

C3H8 + 5 O2 ---> 3 CO2 + 4 H20

CH4 + 2 O2 ----> CO2 + 2 H2O

2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O

X moles of C2H6 will produce 2X moles of CO2

Y moles of C3H8 will produce 3Y moles of CO2

Thus;

X + Y = 20 mL

X =20 - Y ---(1)

2X + 3Y = 52 mL ---(2)

Solving for X by substituting in (2)

2 (20 - Y) + 3Y = 52

40 - 2Y + 3Y = 52

Y = 12 mL

Then X = 8 mL

Volume of CO2 produced when 12 mL of CH4 and 8 mL of C4H10 is burnt = (12 × 2 + 8 × 4) = 56 mL

Therefore, the volume of CO2 produced is 56 mL.

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Answer:

B

Explanation:

i just know

Answer:

B

Explanation:

Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)

Answer: 339.84 K

Explanation:

[tex]$$We are given: \\$\mathrm{n}=0.46$ moles \\$V=13.3 \mathrm{~L}$\\$\mathrm{P}=734 \mathrm{~mm} \mathrm{Hg}=0.965 \mathrm{~atm}$\\Putting these values in ideal gas equation we get:\\$0.965$ batm * $13.3 \mathrm{~L}=0.46 \mathrm{~mol} * 0.0821 \frac{\mathrm{atmL}}{\mathrm{molK}} * \mathrm{~T}$\\$\mathrm{T}=\frac{0.965 * 13.3}{0.46 * 0.0821} \mathrm{~K}$$$\mathrm{T}=339.84 \mathrm{~K}$$[/tex]

Answer:

um Im not sure what the heck that is

answer:

is Well-Known Member. For a 35" you should be in the 28-32 range on road.

Explanation:

your welcome make brainlist

Answer:

D.

Explanation:

This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.

The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.

Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.

The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.

When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.

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Answer:

660J/kg.°C

Explanation:

Using the fact that

∆E of metal + ∆E of water = 0

∆E of the metal = Q = m*c*(T2-T1)

Where

Q = heat lost or gained = ?

m = mass of metal in kg = 0.076kg

c = specific heat of the metal = ?

T1 = 96°C

T2=31°C

∆E of the water=Q= m*c*(T2-T1)

Where

Q = 0.120*4180*6.5 = 3260J

Therefore

3,260J + Q of the metal =0

3,260J + 0.076*C*(31.0–96.0)=0

3,260J - 4.94c = 0

3,260 = 4.94c

3,260/4.94 = c

660J/kg.°C = specific heat of the metal

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