Elements in the alkaline earth metal family of the periodic table
have
electronegativity values than elements in the
halogen family of the periodic table.

Answers

Answer 1

Answer:Lower

Explanation:

( just had the question on ck12.)

Answer 2

Elements in the alkaline earth metal family of the periodic table have lower electronegativity values than elements in the halogen family of the periodic table as they have less electrons in their valence shell.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Related Questions

calculate the mass in grams of two cubic inches (2.00 in³)" of gold. density of gold =19.3 g cm-.³​

Answers

Taking into account the definition of density,  the mass of two cubic inches (2.00 in³) of gold is 632.54 grams.

But first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words,  density is a scalar quantity referring to the amount of mass in a given volume of a substance, that is, it shows the relationship between the weight (mass) of a substance and the volume it occupies.

Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

In this case, you know that:

Density= 19.3 g/cm³ Volume= 2 in³= 32.7741 cm³ (being 1 in³= 16.3871 cm³)

Replacing in the definition of density:

[tex]19.3\frac{g}{cm^{3} } =\frac{mass}{32.7741 cm^{3} }[/tex]

Solving:

mass= 19.3 [tex]\frac{g}{cm^{3} }[/tex]× 32.7741 cm³

mass= 632.54 g

In summary, the mass of two cubic inches (2.00 in³) of gold is 632.54 grams.

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What would happen if there were no gravity anywhere in the universe?

Answers

Objects would no longer be drawn toward each other, because there would be no sloping surface for them to fall down. Instead, they would fly off in whatever direction gravity was keeping them from going.

Answer:

All items in the universe, humans, objects, and the planets, would be floating around. Everything would become weightless.

Hydrocarbons are molecules that consist entirely of carbon and hydrogen atoms and are classified by their bond structure.

a. True
b. False

Answers

Answer:

true

Explanation:

hydrogen and carbon make hydrocarbons

Select the correct answer.
What are the products in the following chemical reaction?
Pb(NO3)2 + KCl

Answers

Lead (II) chloride+ potassium nitrate
PbCI2+KNO3(B)

b. How does government funding affect scientific progress? (1 point)

Answers

Answer:

29 percent of federal R&D money goes to universities, 29 percent goes to industry, and another 29 percent goes to researchers who work directly for federal agencies. About 10 percent goes to federally funded labs operated by private contractors.

Answer:

Explanation:

Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.

15.3 Determine the mass of the following: 15.3.1. 2 mol calcium atoms
15.3.2. 0,3 mol nitrogen molecules
15.3.3. 0,5 mol table salt
15.3.4. 0,2 mol hydrochloric acid
15.3.5. 0,08 mol sodium carbonate (Na2CO3)
15.3.6. 0,25 mol ammonium sulphate (NH4)2SO4​

Answers

Answer:

htyiu

Explanation:

When a sample of iron ore of mass 2.016 g is treated with 50.0 mL of hydrochloric acid, the iron dissolves in the acid to form a solution of . The solution is diluted to 100.0 mL and the concentration of ions is determined by spectrometry to be . What is the mass percentage of iron in the ore

Answers

The mass percentage of iron in the ores is 0.05036 g Fe2+

Why is volume measured with different units?

Answers

Answer:

The volume of an object can be calculated by multiplying its length, width and height. Further, depending on the shape of the object, its volume changes.

Explanation:

Hope this helps


Where is groundwater stored?


Answers

Answer:

Answer Below! : )

Explanation:

Groundwater is stored in the tiny open spaces between rock and sand, soil, and gravel. How well loosely arranged rock (such as sand and gravel) holds water depends on the size of the rock particles.

Hope this helps! : )

Answer:

Underground  brainliest plz

Explanation:


A solution is prepared by diluting 6.0 mL of a 7.6 x 10-4 g/mL solution to a total volume
of 10.0 mL. Calculate the concentration of the dilute solution.

Answers

Answer:

4.56 X 10^ -4 g/mL

Explanation:

A solution is  prepared by diluting 6.0 mL of a 7.6 x 10-4 g/mL solution to a total volume of 10.0 mL. Calculate the concentration of the dilute solution.

(7.6 X10^-4  gm/m L) x( 6.0 m L ) = 45.6 X 10^-4 g

this is dissolved )in 10 m L=45.6 X 10^-4  g/ 10

4.56 X 10^ -4 g/mL

check

6/10 =0.6

4.56/7.6 = o.,6

Materials Visible Uniform Not Visible Non- Uniform State of Matter 1. Sugar and water 2. Oil and water 3. Vinegar and water 4. Salt and pepper 5. leaf and water​

Answers

Answer:

1. Uniform, non visible

2. Visible, non uniform

3. Uniform, non visible

4. Visible, non uniform

5. Visible, non uniform

Explanation:

A heterogeneous mixture is simply any mixture that is not uniform in composition — it's a non-uniform mixture of smaller constituent parts. By contrast, a mixture that is uniform in composition is a homogenous mixture

visible state of matter is when you can easily difference two components of a mixture

non visible is when the state of the matter in the substance is not visible to the eye, it can't be differentiated

Electronegativity is a chemical property which describes how well an atom can attract an electron to itself. Values for electronegativity run from 0 to 4. The difference in electronegativity (ΔEN) is used to predict whether a bond between atoms will be ionic or covalent. It can also be used to predict if the resulting molecule will be polar or nonpolar.

If a bond was made between the two atoms shown below, would the bond be (1) covalent, i.e. ΔEN = ≤ 0.4, (2) polar covalent i.e. ΔEN > 0.4 and ≤2.0, or (3) ionic, i.e. ΔEN > 2.0? Enter 1 for covalent, 2 for polar covalent, 3 for ionic.

protactinium, francium

Answers

#protactinium

It lies in 7th period having Z=91

The outer electronic configuration is 6d^17s^2

d-block element(transition)

So it will form polar covalent bond (2)

#Francium

Z=87

Outer electronic configuration 7s^1

s-block element

It will form ionic bond (3)

Which has more calories: table sugar or aspartame?

Answers

Answer:

Aspartame produces 4 kilocalories of energy per gram when metabolized, sucrose (table sugar) produces 3.9 kilocalories. However, aspartame is approximately 200 times sweeter than sucrose, so it is consumed in much smaller doses.

Explanation:

Answer is Aspartame.

Aluminium sulphate is organic or inorganic compound​

Answers

Answer:

Aluminium sulphate is an inorganic compound.

The ancient Egyptians planted crops and raised
animals for food as early as?
100 AD.
2000 BCE.
5200 BCE.
2560 BCE.

Answers

2560 BC) , some Egyptologists have claimed that the ancient Egyptians used an approximation of π as 22/7 from as early as the Old Kingdom.

Two carbon atoms (Group 14) bond with two hydrogen atoms (Group 1) to form acetylene (C2H2). How would each carbon atom in acetylene bond?(1 point)

Each carbon atom would share one pair of electrons with the other carbon atom and three pairs with each hydrogen atom.

Each carbon atom would share one pair of electrons with the other carbon atom and two pairs with each hydrogen atom.

Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.

Each carbon atom would share one pair of electrons with hydrogen and one pair with the other carbon atom.

Answers

In acetylene each carbon atom share one pair of electrons with hydrogen atom and three pairs with the other carbon atom.

Carbon atom has four electrons its outermost shell it means that it needs four electrons to become stable. In acetylene, two carbon atoms covalently bonded three pairs of electron with each other and the one remaining pair is covalently bonded with two hydrogen atoms.

In this way the carbon as well as hydrogen atoms get stability so we can conclude that in acetylene each carbon atom share one pair of electrons with hydrogen atom and three pairs with the other carbon atom.

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In C2H2, each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.

Acetylene has the molecular formula C2H2. We must recall that carbon is a member of group 14 and it is always tetravalent in all its compounds. Hydrogen is always univalent in its compounds except in hydrides.

Since carbon is always tetravalent and hydrogen is univalent,each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom in C2H2.

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Is a compound a mixture or a pure substance

Answers

Answer:

A compound is a pure substance.

a compound is a pure substance

Three rocks are rolling down a hill at the same speed. Rock 1 has a mass of 1 kg1 kg; rock 2 has a mass of 1.5 kg1.5 kg, and rock 3 has a mass of 3 kg3 kg. Which rock has the most kinetic energy?

Answers

Answer: The first one has the most kinetic energy. Why? traveling with the slowest speed comes with the faster stop withholding more energy in the stone

Explanation:

What are the law of 10 in energy Transfer

Answers

Answer:

When the energy is passed on from one trophic level to another, only 10 percent of the energy is passed on to the next trophic level.

Explanation:

Please for real help me, show work !

Answers

Answer:

27)

a. Silver nitrate

b. Lead chromate

c. Anhydrous magnesium acetate

d. Copper nitrate

28) a. KNo3

What physical and chemical properties would an antique dealer use to determine the substance that makes up a
piece of jewelry?

Answers

Answer:

Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties. Properties that describe how a substance changes identity to produce a new substance are chemical properties. ... Physical and chemical properties can be used to classify a substance as ionic or molecular.

Sometimes people have to cry out all their tears, to make room for a heart full of smiles.​

Answers

True. I am always sad but my heart is always happy cuz it knows there are good things ahead

Please answer question (e)

Answers

Answer:

here is no question (e).............

MASTERING CONCEPTS
31. List three examples of substances. Explain why each
is a substance.

Answers

Answer:

vc

Explanation:

cvcv

How many mL of 1.76 M sodium hydroxide solution (strong base) must be added to 0.75
Macetic acid to make 683 mLa pH 49 buffer? (pka of acetic acid is 4.76)

Answers

Answer: Special care is required to prepare a solution of sodium hydroxide or NaOH in water because considerable heat is liberated by the exothermic reaction. The solution may splatter or boil. Here is how to make a sodium hydroxide solution safely, along with recipes for several common concentrations of NaOH solution.

Explanation:

Hope this helps!

The water in a fishery became polluted when toxic waste was dumped into its pond, causing the fish population to substantially decline. The percents of fish that survived are recorded in the table.
Day 1 2 3 4 5
% Survival 79 55 38 31 19


a) What is the order of the reaction live fish ------> dead fish?

b) What is the rate constant?

c) If the fish continue to die at this rate, how many fish will be alive after 10 days?

Answers

In the pond, the percentage of fish left after ten days is 4%.

Given that;

N(t) = Noe^-kt

Where;

N(t) = percentage of fish at time t

No = Initial percentage of fish

k = rate constant

t = time taken

Given that we had 100% fish population at the beginning, we can see that this reaction is first order.

The rate constant is obtained from;

When t = 5

19 = 100e^-5k

19/100 =e^-5k

0.19 = e^-5k

ln 0.19 = -5k

k = ln (0.19)/-5

k = 0.33

In ten days;

N(10) = 100e^-0.33(10)

N(10) = 4%

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Calculate the moles of calcium oxalate formed from 5 grams of potassium oxalate (molar mass 184.24 g/mol) the mole mole ratio from the balanced equation is 2.1 potassium oxalate to calcium oxalate

Answers

5 g of potassium oxalate react to produce 0.03 moles of calcium oxalate.

Calcium oxalate (CaC₂O₄) is obtained by the reaction of 5 g of potassium oxalate (K₂C₂O₄).

We can calculate the moles of CaC₂O₄ obtained considering the following relationships.

The molar mass of K₂C₂O₄ is 184.24 g/mol.The mole ratio of K₂C₂O₄ to CaC₂O₄ is 2:1.

[tex]5 g K_2C_2O_4 \times \frac{1molK_2C_2O_4}{184.24gK_2C_2O_4} \times \frac{1molCaC_2O_4}{2molK_2C_2O_4} = 0.03molCaC_2O_4[/tex]

5 g of potassium oxalate react to produce 0.03 moles of calcium oxalate.

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Phản ứng phân hủy dinitơ pentaoxide N2O5 là một phản ứng bậc 1 có giá trị hằng số tốc độ
K = 5,1.10-4
s
-1
tại 45oC.
2N2O5(k) → 4NO2(k) + O2(k)
a. Biết nồng độ ban đầu của N2O5 là 0,25M, hỏi sau 3,2 phút nồng độ của nó là bao nhiêu?
b. Sau bao lâu nồng độ N2O5 giảm từ 0,25M thành 0,15M?
c. Sau bao lâu chuyển hóa hết 62% N2O5?

Answers

When converted to a household measurement, 9 kilograms is approximately equal to a

22. What is the mass in grams of each of the following?
a. 3.011 x 1023 atoms F
b. 1.50 x 1023 atoms Mg
c. 4.50 x 1012 atoms Cl
d. 8.42 x 1018 atoms Br
e. 25 atoms W
f. 1 atom Au

Answers

The mass in grams of 3.011 x 10²³ atoms of F is 9.5 g.

The mass in grams of  1.50 x 10²³ atoms of Mg is 5.98 g.

The mass in grams of  4.50 x 10¹² atoms of Cl is 2.65 x 10⁻¹⁰ g.

The mass in grams of  8.42 x 10¹⁸ atoms of Br is 1.12 x 10⁻³ g.

The mass in grams of  25 atoms of W is 3.1 x 10⁻²¹ g.

The mass in grams of  1 atom of Au is 3.27 x 10⁻²² g.

What is the mass in grams of 3.011 x 10²³ atoms F?

The mass in grams of 3.011 x 10²³ atoms of F is calculated as follows;

6.023 x 10²³ atoms = 19 g of F

3.011 x 10²³ atoms F  = ?

= (3.011 x 10²³ x 19 g)/(6.023 x 10²³)

= 9.5 g

The mass in grams of  1.50 x 10²³ atoms of Mg is calculated as follows;

6.023 x 10²³ atoms = 24g of Mg

1.5 x 10²³ atoms F  = ?

= (1.5 x 10²³ x 24 g)/(6.023 x 10²³)

= 5.98 g

The mass in grams of  4.50 x 10¹² atoms of Cl is calculated as follows;

6.023 x 10²³ atoms = 35.5 g of Cl

4.5 x 10²³ atoms Cl  = ?

= (4.5 x 10¹² x 35.5 g)/(6.023 x 10²³)

= 2.65 x 10⁻¹⁰ g

The mass in grams of  8.42 x 10¹⁸ atoms of Br is calculated as follows;

6.023 x 10²³ atoms = 80 g of Br

8.42 x 10¹⁸ atoms Br = ?

= (8.42 x 10¹⁸  x 80 g)/(6.023 x 10²³)

= 1.12 x 10⁻³ g

The mass in grams of  25 atoms of W is calculated as follows;

6.023 x 10²³ atoms = 74 g of W

25 atoms W = ?

= (25  x 74 g)/(6.023 x 10²³)

= 3.1 x 10⁻²¹ g

The mass in grams of  1 atom of Au is calculated as follows;

6.023 x 10²³ atoms = 197 g of Au

1 atom of Au = ?

= (1  x 197 g)/(6.023 x 10²³)

= 3.27 x 10⁻²² g

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What is the sum of the atomic numbers of each element present in the reactants of the given formula?


2 NH3 + H2SO4 → (NH4)2SO4

Answers

Answer:

25

Explanation: They all add up to 25 Atoms

The atomic number of nitrogen is 7 and that of oxygen is 8. Atomic number of hydrogen is one and the atomic number of sulphur is 16. Then, the sum of  atomic numbers of each element present in the reactants of the given formula is 32.

What is atomic number ?

The atomic number of an atom is the number of electrons in its neutral state. This number is equal to the number of protons also. The modern periodic table classify all elements based on their atomic numbers.

The sum of number of protons and neutrons of an element is called its mass number. For the given formula, the elements present are H, O, N and S.

atomic number of H = 1

atomic numebr of N = 7

atomic number of O =8

atomic number of S = 16.

Then ,sum of atomic number s= 1 + 7 + 8 + 16 = 32.

Therefore, the sum of the atomic numbers of each element present in the reactants of the given formula is 32.

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