Answer: The reactivity of group 7 decreases as we move down the group because:
Explanation:
The elements of group 7 that is fluorine to iodine. The halogens are non metals and they react with metals to gain electrons. The metals loose electrons and the non metal gains it.
As we move down the group the atomic radius gets bigger( more electron and more proton) and as a result the outer shells move further away from the nucleus.
There is more distance between the negatively charged electrons and positively charged nucleus.
Therefore the force of attraction between the shells and nucleus is lesser or weaker.
This makes attracting an extra electron from metals very difficult which results in weaker reaction.
Consequently, the reactivity decreases as we move down the group 7
what is the best example of energy is transferred object to object
electric energy to heat and light energy
Can somebody help me with the last 2. Will mark brainliest
ANAGRAM: Rearrange the scrambled letters to form the correct word. Refer to the meaning of each word as your clue.Your answers should be in CAPITAL LETTERS ONLY
1. _ _ _ _
2. _ _ _ _ _
3. _ _ _ _ _ _ _
4. _ _ _ _ _ _ _ _
What is a "siege machine"?
Answer:
A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification.
Explanation:
What is one difference between Group 2 and Group 15 of the Periodic Table of Elements?
Answer:
Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)
Explanation:
ASAP question also in pic will get Brainiest
What is the force of an egg that is thrown at a brick wall if the egg has a mass of .03 kg and an acceleration of 50 m/s/s
Use the formula F=ma ( dont forget the units )
Answer:
F=ma
=(0.3kg) (50m/s/s)
F =15 kg per m/s/s
HELPPP ASAPPPPP I WILL GIVE BRAINLIEST
Ocean currents contribute to global climates and occur due to differences in temperature, salinity, and density. WHY do you THINK these differences can cause currents to form?
Answer:
Its changes over time.
Explanation:
I think because each ocean current has a different temperature.
Answer:
Thermohaline circulation. This is a process driven by density differences in water due to temperature (thermo) and salinity variations in different parts of the ocean. Currents driven by thermohaline circulation occur at both deep and shallow ocean levels and move much slower than tidal or surface currents.
21) What is the volume (inL) of 3470 g of liquid glycerol, which has a density of 1.26 g/?
Answer:
V = 2.75 L
Explanation:
Given that,
Mass of liquid glycerol, m = 3470 g
The density of liquid glycerol, d = 1.26 g/cm³
We need to find the volume of liquid glycerol.
We know that,
Density=mass/volume
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{3470\ g}{1.26\ g/cm^3}\\\\V=2753.96\ cm^3[/tex]
We know that, 1 cm³ = 0.001 L
V = 2.75 L
So, the volume of liquid glycerol is 2.75 L.
write down the needed and important water in our life?
Answer:
Because 60 percent of our body weight is made up of water. Our bodies use water in all the cells, organs, and tissues, to help regulate body temperature and maintain other bodily functions.
Explanation:
Our bodies is made out of 60% water and even if the percentage goes down 1% we could faint. 5% and we could die. We wash off with water to clean ourselves. We use water to cook like boiling pasta. Water is a necessity not just humans need it but plants need it to grow and germinate. Hope this helps sorry it took so long. I had a fight with autocorrect.
3. Which of the following items is representative of a homogeneous
mixture?
2 points
A. spaghetti & meatballs
B. cheeseburger
C. white bread dough
D. smoothie
E. Both A and B
O F. Both C and D
4. Which of the following is a chemical property of matter?
Answer: F. both c and d
Explanation:
homogeneous mixture is of same kind/phase. so the most appropriate answer we can take is smoothie and white bread dough :)
HELP ASAP when SrCl2 + Li3PO4 --> Sr3(PO4)2 + Licl is correctly blnced, the coefficient in front of the Licl will be a
O 1
o 2
03
06
A sealed container of liquid develops some vapor pressure. Which of the following would reduce the vapor pressure?
increase the temperature
add more liquid to the container
decrease the temperature
Answer:
Decrease the temperature
Explanation:
If you increase the temperature the vapor pressure will increase. Adding more liquid to the container is completely irrelevant.
Decreasing the temperature would reduce the vapor pressure of a sealed container of liquid. Therefore, option (C) is correct.
Vapour pressure is the pressure that the vapour phase puts on the liquid phase when the two phases are in balance. At higher temperatures, the molecules of the liquid have more energy and are more likely to move into the vapour phase. This makes the vapour pressure go up.
But when the temperature goes down, the average energy of the molecules in the liquid goes down, which slows the rate of evaporation. This means that fewer molecules are moving from the liquid phase to the vapour phase. As a result, the vapour pressure is lower.
Putting more liquid in the bottle wouldn't change the vapour pressure directly. The temperature and the type of liquid, not the amount, are what decide the vapor pressure.
Learn more about Vapor Pressure, here:
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What is the density of iron if 5.0ml has a mass of 39.5g?
Answer: p = m/Vp = 39.5 g/5.0 cm3p = 7.9 g/cm3 4.
Select the correct answer. Which notation is used to represent gamma decay?
Answer:
B.
Explanation:
Consider the properties of ionic and covalent compounds. Why do you think ionic compounds form crystals and covalent compounds form molecules?
Where are the electrons found in the atom
Answer:
Explanation:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
How many molecules are in the substance formula of 2C6H1206 (use coefficients)
Please help ASAP.
Answer: The number of formula units present in 2 moles of [tex]C_6H_{12}O_6[/tex] are [tex]1.2044\times 10^{24}[/tex]
Explanation:
Formula units are defined as the number of molecules or atoms present in 1 mole of a compound or element respectively.
According to mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of formula units
Here, 2 represents the number of moles of [tex]C_6H_{12}O_6[/tex]
We are given:
Moles of [tex]C_6H_{12}O_6[/tex] (glucose) = 2 moles
Number of formula units of [tex]C_6H_{12}O_6=(2\times 6.022\times 10^{23})=1.2044\times 10^{24}[/tex]
Hence, the number of formula units present in 2 moles of [tex]C_6H_{12}O_6[/tex] are [tex]1.2044\times 10^{24}[/tex]
how many molecules are in 1kg of water
Answer:
334.2× 10²³ molecules
Explanation:
Given data:
Mass of water = 1 Kg ( 1000 g )
Number of molecules = ?
Solution:
Number of moles of water:
Number of moles = mass/ molar mass
Number of moles = 1000 g/ 18 g/mol
Number of moles = 55.5 mol
1 mole contain 6.022× 10²³ molecules
55.5 mol×6.022× 10²³ molecules
334.2× 10²³ molecules
Please help with Chemistry! Very urgent! I’ll give you 40 points
Answer: 3. No displacement, zinc is most reactive.
4. Calcium Chloride, Calcium is most reactive.
5. No displacement, Copper is most reactive
6. No displacement, Calcium is most reactive
7. Hydrogen Oxide, Hydrogen is most reactive
8. Carbon oxide, Carbon is most reactive
9. No displacement, Aluminum is most reactive
10. Potassium Kryptide + Lead, no displacement, Potassium is most reactive.
i need help solving this!!!
Please help!
Magnesium Sulphate can be made from magnesium and dilute sulfuric acid. Mg + H2SO4 -> MgSO4 + H2. calculate the mass of magnesium sulfate that would be obtained from 4G of magnesium.
Answer:
20 g of MgSO₄.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Mg + H₂SO₄ —> MgSO₄ + H₂
Next, we shall determine the mass of Mg that reacted and the mass of MgSO₄ produced from the balanced equation. This is illustrated below:
Molar mass of Mg = 24 g/mol
Mass of Mg from the balanced equation = 1 × 24 = 24 g
Molar mass of MgSO₄ = 24 + 32 + (16×4)
= 24 + 32 + 64
= 120 g/mol
Mass of MgSO₄ from the balanced equation = 1 × 120 = 120 g
SUMMARY:
From the balanced equation above,
24 g of Mg reacted to produce 120 g of MgSO₄.
Finally, we shall determine the mass of MgSO₄ produced by the reaction of 4 g of Mg. This can be obtained as follow:
From the balanced equation above,
24 g of Mg reacted to produce 120 g of MgSO₄.
Therefore, 4 g of Mg will react to produce = (4 × 120)/24 = 20 g of MgSO₄.
Thus, 20 g of MgSO₄ is obtained from the reaction.
Help , thank you !!
Answer:
radioactive
nonmetal
hydrogen
liquid
rarely (since they have a full valence electron shell)
inner transition
HELPP ME !!!! DUE NOW!!!!!!
Match each element to the number of electrons in its valence shell.
Match Term Definition
Chlorine (Cl) A) Seven
Neon (Ne) B) Eight
Phosphorus (P) C) Six
Sulfur (S) D) Five
Answer:
the answer is
a
b
d
c
Explanation:
hopeit help
The correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixChlorine has an atomic number of 17 and its electronic configuration is given by:[tex][Cl]=1s^22s^22p^63s^23p^5[/tex]
Number of valence electrons in chlorine is 7.Neon has an atomic number of 10 and its electronic configuration is given by:[tex][Ne]=1s^22s^22p^6[/tex]
Number of valence electrons in neon is 8.Phosphorus has an atomic number of 15 and its electronic configuration is given by:[tex][P]=1s^22s^22p^63s^23p^3[/tex]
Number of valence electrons in phosphorus is 5Sulfur has an atomic number of 16 and its electronic configuration is given by:[tex][S]=1s^22s^22p^63s^23p^4[/tex]
Number of valence electrons in sulfur is 6.So, from this, we can conclude that the correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixLearn more about the valence electrons here:
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John rings a doorbell.
Did John apply a force to ring the doorbell? Explain how you
know and which type of force he applied.
HELP PLEASEE
Answer:
Yes
Explanation:
Remember, Newton's third law of motion; which says in part that "Every action has an equal and opposite reaction."
Hence, in this case, the fact that the doorbell rang out implies that there was another force that was exerted on it; which is, John's finger pressing the doorbell.
In other words, when John uses his fingers to press the doorbell button he applies a force (a mechanical force), and that force results in an opposite reaction; the ringing of the doorbell.
When delivering a presentation, pay attention to _____ and _____.
posture and eye contact
volume and the introduction
content and source citations
believability and confidence
Answer:
I think the last one
Explanation:
The reason for that is because when you go up to present something you always want to try to hav believability and confidence.
Answer:
believability and confidence
Explanation:
the ____ particles of an atom which are called electrons
Answer:
Subatomic particles
Explanation:
I hope it helped
Photosynthesis is the process in which plants use sunlight to convert water and carbon dioxide into glucose and oxygen. Which of these statements explains why photosynthesis is a chemical change?
A New substances are formed with properties that are different from the original substances.
B New substances are formed but their properties are the same as the original substances.
C No new substance is formed but some of the properties change.
D No new substance is formed and the change is easily reversible. Which of the following images shows a chemical change?
Photosynthesis is a chemical change as:
A. New substances are formed with properties that are different from the original substances.
What is a Chemical Change?A chemical change happens when one chemical substance is transformed into one or more different substances. A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.
Thus, correct option is A which proves that photosynthesis is a chemical change.
Find more information about Chemical change here: brainly.com/question/453535
Atomic Radius: Complete the following:
#of Atomic A) Which element has the smaller atomic radius?
Element
Protons Radius
B) Why do you think this element has a smaller radius? (how
Be
4
153
does the number of protons affect atomic radius?)
F
147
lonization Energy: Complete the following:
Atomic
Element
1st lonization A) Which element has the smaller 1st ionization energy?
Radius Energy B) Why do you think this element has a smaller 1st ionization
He
energy? (how does atomic radius affect 1st ionization energy?)
Kr
Electronegativity: Complete the following:
# of
Element
Electroneg- A) Which element has the larger electronegativity?
Protons ativity
B) Why do you think this element has a larger electronegativity?
(how does # of protons affect electronegativity?)
Ga
Answer:
2 A): Fluorine
B): more protons, more force attraction less atomic radius
3A): Helium
B):it has small atomic radius
4 th question is not visible.....
how to find how many atoms are in grams.
Explanation:
To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro's number: 6.02 x 10^23.
what pair of elements will react more violently
a chlorine and lithium
b chlorine amd potassium
c iodine and lithium
d iodine and potassium
Answer:
chlorine and potassium
Explanation:
Answer:
Chlorine and potassium