Which of the following pairs of groups of elements cannot form ionic bond? *


IA & VIIA
IA & VA
VIIA & VIIIA
IIA & VIA

Answers

Answer 1

Answer:

pq ning kamot oi

Explanation:

hahahsfdydn ebejkakbabaha


Related Questions

What would happen to a plant that did not perform cellular respiration in the light?

Answers

Answer:

Explanation:

Cellular respiration does not depend on light...  Some plants may go into a form of hibernation during winter when the amount of light during the day is less.  The reduction of plant growth and activity would reduce the need for the energy produced by cellular respiration.

What measures are being taken to minimize the threat of green iguana?


Answers

Answer:

use wire nettings

Explanation:

and cages

Which of the following equations is balanced?
a) HgO -> Hg + 02
b) 2Mg + C12 --> MgCl2
c) P4 + 402 - 2P205
d) 2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2
e) None of the above​

Answers

Answer:

a

Explanation:

a because a

Why do some animals defend their territory after they have mated
and reproduced?


a.They can gain more food for their offspring

b.they can provide a larger nest for their offspring.

c.They are naturally aggressive.

d.They are carrying out a mating dance.​

Answers

Answer:

i believe it is a

Explanation:

The reason is :a.They can gain more food for their offspring

Animals tend to protect their territory because they don't want  intruders to invade their territory.

Animals majorly protect their territory in order to protect their foods from been eating by intruders as this will enables their offerings to have enough foods to eat.

They as well guard  their territory in order to prevent intruders from invading the place they have prepare as their mating place.

Inconclusion  The reason why some animals defend  their territory after they have mated

and reproduced is :a.They can gain more food for their offspring

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The most valuable part of the carcass is the

Answers

Answer:

The rib and loin, because of their palatability and diversity in how they can be used--especially on the market.

Explanation:

how much heat is needed to warm 250g of water from 22°C to 98°C ?​

Answers

Answer:

79'420J

Explanation:

We know mass 250g and

∆T=98°C -22°C

=76°C

The specific heat capacity for water is 4,18Zj/g°C

THEREFORE

H=250g14,8j/C 76°C

=79'420J

Does pure water conduct electricity? if not, what can we do to make it conducting?​

Answers

Explanation:

Pure water does not conduct electricity. This is because pure water do not contain any salts. Pure water can conduct electricity when common salt is added to it, as salt solution is conducting in nature.

a student is trying to classify an unidentified, solid gray material as a metal or a non metal. which question will best help the student classify the material?

F. Is the material malleable or ductile?
G. Does the material feel hard to the touch?
H. Will the material float in water?
J. Does the material feel rough or smooth?

Answers

Answer:

i think the answer is f as metals are malleable and ductile

Answer:

F

Explanation: Most metals carry the trait that they are malleable and ductile.

2. Describe how a cold front affects weather.

Answers

Answer:

Cold fronts can produce dramatic changes in the weather.  

Explanation: They move fast, up to twice as fast as a warm front. As a cold front moves into an area, the heavier (more dense) cool air pushes under the lighter (less dense) warm air, causing it to rise up into the troposphere.

Answer:

the person above is correct

Explanation:

just to confirm it

hope th8s helps!

have a good day :)


1. Plants that perform photosynthesis convert sun (solar) energy to
food energy.

Answers

Answer:

true

Explanation:

one reason is because plants need sunlight and water because it is their source of food

Chemistry question please help

Answers

Answer:

a) the tendency to form hard, brittle crystals.

Explanation:

Metallic bonding occurs between metals; metals are excellent conductors of electricity, are malleable (can be hammered into thin sheets) and have luster (are shiny). Brittleness is indicative of an ionic bond or ionic compound.

A mixture of large, dispersed particles.

Answers

Answer:

Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium.

Answer:

Colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid, liquid, or gaseous medium.

Explanation:

I got the answer first


How are chemical equations balanced?

Answers

Use coefficients of products and reactants to balance the number of atoms of an element on both sides of a chemical equation.

DESPERATE WILL GIVE BRAINLIST AND THAKS
Which phrase describes how vestigial structures provide evidence that suggests a common ancestor and supports that life changes over time?

Question 3 options:

some animals exhibit similar structures, possibly due to a common ancestor


some animals exhibit similar stages of embryonic development


some animals exhibit structures that are no longer used for any purpose


some fossils exhibit similar biological proteins

Answers

Answer:

some animals exhibit structures that are no longer used for any purpose

Explanation:

Vestigial structures are defined as the the organs which are no longer used for any purpose.

Vestigial structures provide evidences of common ancestors as they shows how organisms changed or evolved in the use of these structures. for example: human appendix which is no longer functional in human body but as per Darwin's theory of evolution it was once used by our herbivorous ancestors to protect good bacteria in the gut.

Hence, the correct answer is "some animals exhibit structures that are no longer used for any purpose".

Please help me find the final answer

Answers

Answer:

5. The mass of Na₂CO₃, that will produce 5 g of CO₂ is approximately 12.04 grams of Na₂CO₃

6. The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃ is 693.[tex]\overline{3168}[/tex] grams of N₂

Explanation:

5. The given equation for the formation of carbon dioxide (CO₂) from sodium bicarbonate (Na₂CO₃)  is presented as follows;

(Na₂CO₃) + 2HCl → 2NaCl + CO₂ + H₂O

One mole (105.99 g) of Na₂CO₃ produces 1 mole (44.01 g) of CO₂

The mass, 'x' g of Na₂CO₃, that will produce 5 g of CO₂ is given by the law of definite proportions as follows;

[tex]\dfrac{x \ g}{105.99 \ g} = \dfrac{5 \ g}{44.01 \ g}[/tex]

[tex]\therefore {x \ g} = \dfrac{5 \ g}{44.01 \ g} \times 105.99 \ g \approx 12.04 \ g[/tex]

The mass of Na₂CO₃, that will produce 5 g of CO₂, x ≈ 12.04 g

6. The chemical equation for the reaction is presented as follows;

N₂ + 3H₂ → 2NH₃

Therefore, one mole (28.01 g) of nitrogen gas, (N₂), reacts with three moles (3 × 2.02 g) of hydrogen gas (H₂) to produce 2 moles of ammonia (NH₃)

The mass 'x' grams of nitrogen gas (N₂) that will react completely with150 g of hydrogen (H₂) in the production of NH₃ is given as follows;

[tex]\dfrac{x \ g}{28 .01 \ g} = \dfrac{150 \ g}{3 \times 2.02 \ g} = \dfrac{150 \ g}{6.06 \ g}[/tex]

[tex]\therefore \ x \ g= \dfrac{150 \ g}{6.06 \ g} \times 28.01 \ g = 693.\overline {3168} \ g[/tex]

The mass of nitrogen gas (N₂) that will react completely with 150 g of hydrogen (H₂) in the production of NH₃, x = 693.[tex]\overline{3168}[/tex] grams

A double replacement reaction has two compounds as reactants.
True or false

Answers

Answer:

yes, A double replacement reaction has two compounds as reactants.

hence it's true.......

Answer:

it's true...

Explanation:

PLSSS HELP ANYONE ASAP!

Answers

B I hope it’s right I don’t really help a lot but yeah lol

CH4 and CO₂ are the chemical formulas for:

Answers

Answer:

CH4 = Methane

CO2 = Carbon dioxide

Hope this Helps!!Hope this Helps!!:)

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, the name of CH[tex]_4[/tex]  and CO[tex]_2[/tex]  are Methane and Carbon dioxide respectively.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.

chemical formula                                      Chemical name

CH[tex]_4[/tex]                                                           Methane

CO[tex]_2[/tex]                                                      Carbon dioxide

Therefore, the name of CH[tex]_4[/tex]  and CO[tex]_2[/tex]  are Methane and  Carbon dioxide respectively.

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HELP PLEASE❗️❗️‼️

An increase in temperature is an increase in.... ( there are two correct answers)
A.) Water molecules
B.) The melting point
C.) pressure
D.) Fun

Answers

C and B

Hope this helps!

what the steps of Cellular Respiration in the correct order?

Answers

Answer:

Cellular respiration uses energy in glucose to make ATP. Aerobic (''oxygen-using”) respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport. In glycolysis, glucose is split into two molecules of pyruvate. This results in a net gain of two ATP molecules.

2
What is neutralization reaction.
befine acidic salt with an xample.
What is Haber's process?
6. Write two major are or iron.​

Answers

Explanation:

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

I’ll really appreciate it if you help me out on this one .

Answers

Answer:

3) All the animals and plants in a desert

4) Species becoming extinct

Calculate the number of moles in 3.440 x 10^35 formula units of RbF. (Molar mass of RbF is 104.47g/mol).

Answers

3.293 moles of RbF ! Divide 3.440 X 10^35 by 104.47

How many moles of O are in 12.6 mol Fe(NO3)3?
The answer is 113.4, rounded is 113
Explanation: Just multiply 12.6 mol Fe(NO3)3 by 9 ( 9 is the number of O atoms in the equation)

Answers

Answer: There are 113 moles of O in 12.6 moles of [tex]Fe(NO_3)_3[/tex]

Explanation:

Given : moles of [tex]Fe(NO_3)_3[/tex] = 113.4

To find : moles of O = ?

1 mole of [tex]Fe(NO_3)_3[/tex] contains = 9 moles of O atoms

Thus 12.6 mole of [tex]Fe(NO_3)_3[/tex] contains = [tex]\frac{9}{1}\times 12.6=113.4[/tex] moles of O atoms

Thus there are 113 moles of O in 12.6 moles of [tex]Fe(NO_3)_3[/tex]

When 10 grams of water completely evaporate into water vapor, the volume of the water vapor is greater than the volume of the original liquid water, but the mass remains the same. Why does the mass stay the same? Which answer is correct?

A
The temperature of the liquid water and water vapor is the same.

The temperature of the liquid water and water vapor is the same.

B
The density of the liquid water is the same as the density of the water vapor.

The density of the liquid water is the same as the density of the water vapor.

C
The number of atoms in the water vapor is equal to the number of atoms in the liquid water.

The number of atoms in the water vapor is equal to the number of atoms in the liquid water.

D
The distance between the water molecules is the same in the liquid and the vapor.

The distance between the water molecules is the same in the liquid and the vapor.

Answers

Answer: I think the answer is B or C, its kind of hard.

As the number of atoms in the water vapor is equal to the number of atoms in the liquid water. Therefore, the mass of the water remains the same.

What is evaporation?

Evaporation is a process that usually happens on the surface of water or liquid and it involves the conversion of the liquid phase into the gaseous phase. This process involves a change in the state of matter of water or liquids.

When the water is completely evaporated into water vapor the density of the water vapor is less than the density of the liquid water as the vapors occupy a large volume in comparison to liquid water.

But the number of atoms in the water vapor is the same as the number of atoms in the liquid water. The mass of the water is due to the mass of the atoms.

Therefore, the mass of the water remains the same during the phase transition from liquid water to water vapors. Therefore, option (C) is correct.

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In 1774, Joseph Priestly discovered oxygen gas by heating mercury(II) oxide powder with focused sunlight through a lens. How many grams of HgO (216.59 g/mol) would be decomposed to produce 1.50 mol O2 ? A. 650. g HgO B. 325gHgO C. 162gHgO D. 3.00 g HgO

Answers

Answer:

A. 650 g

Explanation:

The equation of the reaction is given as;

2 HgO(s) --> 2Hg(s)  + O2(l)

From the reaction;

2 mol of HgO produces 1 mol of O2

x mol of HgO would produce 1.50 mol of O2

2 = 1

x = 1.5

Solving for x;

x = 1.5 * 2 / 1 = 3 mol

Converting to mass;

Mass = Number of moles * Molar mass

Mass = 3 mol  * 216.59 g/mol

Mass = 649.77 g ≈ 650. g

Correct option is ;

A. 650 g

What are two methods used to help identify the species of insect from the eggs on
human remains? Describe the methods.

Answers

Answer:

The two different methods to help identify the species of insects from the eggs on human remains are by using a small paint brush dipped in water and the other way is by using forceps.

Explanation:

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The insects have been defined as the most successful arthropods. There are far more species in the class Insecta than in any other group of animals. The insects are the only invertebrates with wings.

What are insects?

The insects play a very important role in the web of the life in every environment. Their jobs include pollinating flowering plants, since it is the source of food for insectivorous animals and it assist in the decomposition of plants and animals.

The two different methods which help to identify the species of the insects from the eggs on human remains are by using a small paint brush dipped in water and the other way is by using the forceps.

The study of insects and their life cycle are found to be important for the forensic entomologist. This is because it could set a timeline on when the crime is happened. The life cycle of a blowfly starts as an egg and then goes to be maggots.

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how many formula units of lead (IV) phosphate in 1.75g

Answers

1.05 x 10 to the 21 power formula units of lead (IV) phosphate

If each image represents one mole of the substance pictured, which contains the greatest
amount of substance?
A)molecules
B) atoms
C)formula units
D)none; all amounts are the same

Answers

I think it’s B) Molecules
I searched it up

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, all amounts are the same. The correct option is option D.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Calculating the amount of a chemical in grams from moles is among the most often chemistry computations. You will employ the mole ratio of reactants to reagents when balancing equations.

Therefore, all amounts are the same. The correct option is option D.

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HELP!!
need correct answer..

Directions: Write True if the statement is correct and False if the
statement is incorrect.

21. An ecosystem is where both biotic factor such as
plants, animals and other organisms and abiotic factor like weather
(temperature and humidity) and landscape (rocks, soil, etc.) work
together.
22. Intertidal zone are areas where salt water and fresh
water meets (brackish water).
23. Water in estuaries is less salty.
24. Organisms does not require energy to perform life
activities.
25. Intertidal zones are area where the presence of water
depends on the tides.
26. Producer are organisms that produce food from
sunlight and inorganic substances.
27. Food chain is a series of transfer of energy as the
algae can be eaten by small fish and small fish may be eaten by a
carnivorous fish.
28. Decomposers are organisms that eat food scraps and
left-overs.
29. Consumers are organisms that eat other organisms.
30. A food web is composed of different food chains.

Answer my question pls!!

spam/unhelpful/incorrect/not sure = REPORT!! ​

Answers

Answer:

21: True

22: False

23: True

24: False

25: False

26: True

27: True

28: False

30: True

Explanation: Hope this is helpful :)

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