Which of these metals is the least reactive?
in
caldum
sodium
potassium​

Answers

Answer 1

Answer:

Calcium

Explanation:

It is because sodium and potassium are highly reactive metal i.e. Group 1 but calcium is Group 2 element. So, calcium is least reactive.


Related Questions

3. How many moles of H20 are in 15.2 grams of pure ice?

Answers

Answer:

18.01528 grams.

Explanation:

Ther are 0.84 moles of [tex]H_{2}O[/tex] in 15.2 g of pure ice.

The molar mass of [tex]H_{2}O[/tex] is 18g.

To calculate the number of moles of a substance in a given mass of the sample, we divide the given mass by the molar mass of the sample,

Number of moles = given mass / molar mass

It is given that we have 15.2g of pure ice. Then the number of moles of [tex]H_{2}O[/tex] will be:

n = 15.2/18

n = 0.84 moles.

Learn more about molar mass:

https://brainly.com/question/1855861

Which best explains why the atomic theory is a scientific one?
A. The theory was written by a famous scientist and has been around
for a very long time.
B. The theory describes what atoms are and has not changed over
time.
C. The theory explains many observations and is supported by a
large amount of evidence.
D. The theory represents a guess by many different scientists about
how atoms work.

Answers

Answer:

C

Explanation:

Answer:

it will option c it is perfect

PLS HELPP!!!
i’ll mark brainliest + 15 points!!


If 2.5 grams of calcium bromide reacted with excess lithium oxide, how many grams of bromide product would be formed?

Answers

ok so this could be totally wrong because i just learned how to do this in chem but i got 2.2g. i included i picture of my work

Shonda’s car gets an average of LaTeX: 27 miles per gallon. Gas costs $LaTeX: 2.25 per gallon and she drives LaTeX: 892 miles to get from Baltimore, MD to Orlando, FL. What are the conversion factors she could use to calculate the cost of gas to get from Baltimore to Orlando? How much will she spend on gas?

Answers

The conversion factors she could use to calculate the cost of gas : 33.037 gallon from Baltimore to Orlando

She will spend $74.33 on gas

Further explanation

Given

Shonda’s car : 27 miles per gallon

Gas cost = $ 2.25/gallon

Distance Baltimore to Orlando = 892 miles

Required

Cost of gas

Solution

Total gallon needed to get from Baltimore to Orlando :

892 miles : 27 miles/gallon = 33.037 gallon

Cost of gas :

33.037 gallon x $2.25/gallon = $74.33

(AKS 2e) Group 2 metals bond with nonmetals or polyatomic ions. What question

would a student need to know to form a compound with Group 2 metals? (DOK 2)

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements lose electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Answers

Answer:

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Explanation:

Metals are electropositive in nature. This means that they loose electrons. Thus, metals form ionic bonds by loosing electrons to non metals.

Elements of group 2 have a valency of 2 while those of group 17 has a valency of 1 so the ratio in which group 2 elements bond with elements of group 17 is 1:2. Hence the answer.

Atoms combine in whole-numbcher ratios.​

Answers

Ummm is there a picture u needed to attach orrrrrm

Why is calcium carbonate preferred over lumps of calcium carbonate for synthesis of calcium chloride

Answers

Answer:

it reacts to limestone better and is a bit more firmer and mostly preferred over because of how fast it can react towards chemicals

Physical is to chemical as size is to ???

Answers

Answer:

Physical is to chemical as size is to length

Explanation:

That's for if your looking for the synonym of size. (i dont really know what your asking, but if your looking for the opposite of size than its length.)

properties changes if the size of an object changes?

A.mass
B.volume
C.weight
D.all of the above

Answers

Answer:

D

Explanation:

The answer should be D, when the size of an object changes it changes how much mass it has how heavy it is (weight), and how much space it takes up (volume).

List the 3 particles of an atom (w/their symbol & charge)

Answers

Proton p      +1

Neutron n       0

Electron e-      -1

These two finches share a common ancestor from South America. What is the most likely way that one ancestral finch species will develop into two distinct species?




A The ancestral species was genetically engineered to become two new species

B Groups of the ancestral species became isolated and adapted to different environments.

C. Two individual birds acquired many spontaneous mutations.
D. The ancestral species mated with other species and the offspring resulted in two new species.

Answers

Answer:

The correct answer is - B. Groups of the ancestral species became isolated and adapted to different environments.

Explanation:

Two finches Warbler Finch and Woodpecker Finch are two distinct finches are finches from the Galapagos Islands. Both of these finches have a common ancestor from South America.

The most likely explanation of developing two distinct species from an ancestral finch is by bein isolated and developed or adapted according to the challenges and environmental conditions and ultimately become different species after several generations.

What is the ability for a substance to flow

Answers

The ability for a substance to flow is fluidity.

Which substances show flowing?

Only liquid and gaseous substances have the ability to flow from one point to other as they have weak intermolecular force in it.

Fluidity is the quantity which gives idea about the ability of that substance to flow. At normal conditions at room temperature, any substance has the tendency to distort its shape in order to flow or take the shape of the container it is enclosed in.

Hence the ability for a substance to flow is fluidity.

To know more about fluidity, visit the below link:

https://brainly.in/question/466917

#SPJ2

HELP!!! DUE TONIGHT!!
10 PTS!!
the answers are given already but my teacher wants me to show work...pls help!!!

Answers

Answer:

K I will attempt

Explanation:

a)

[tex]O_2_{(g)}+ 2H_2_{(g)} => 2H_2O_{(l)}\\[/tex]

b)

1 : 2 : 2 (I don't know if this is what the question wants but it is what I would answer)

c)

Hydrogen because it requires 2 moles of H2 to react with 1 mole of O2

d)

24 moles of water. Look at stoichiometric coefficient. 2:2 means 24 moles you get 24 moles

e)

Oxygen. 2 < 5/2. Remember, 1 mole of O2 requires 2 moles of H2. But 5/2 is still greater than 2

f)

First, let's find out how many moles of water we can get. Since O2 is the limiting reactant, and O2:H2O ratio is 1:2, we will get 4 moles of H2O. Then, we can multiply 4 by Avogadro's number which is [tex]6.022*10^{23}[/tex] to get the number of molecules. We get: 2.41 * 10^24 molecules of water.

Answer:

I'ma just take the point thank you very much

mention the three colours of Zanzibar .

Answers

Answer:

horizontal tricolor with three equal-sized stripes of blue, black and green.

Explanation:

hope this is what u want

Answer: ↓

Black and Vivid Cerulean,

About The Photos: This second Photo is the flag from the 2000's I believe, and the first Photo shows the 1964 flag.

In which type of reaction is ATP the driving force?
O
A. anabolism only
o
B. catabolism only
O
C. both anabolism and catabolism
D. neither anabolism nor catabolism

HELP PLEASE!!

Answers

The answer you’re looking for is
C.

- I hope this helps, I got it right. Enjoy the rest of your day/night, please make me brainliest!
the answer is C. good luck! :)

ehat is the name of the hydrate Ba(OH)2 8 H2O​

Answers

Answer: Barium hydroxide octahydrate

Explanation:

Please help me with this question please!!!
Look at the picture provided and answer the question

>>Select one only.
Q:An aromatic hydrocarbon is represented by which structural formula?
>>Choose one answer from the picture below that answers the question above
A
B
C
D

Answers

Answer:

A

Explanation:

I looked up aromatic hydrocarbon and this one looks like a replica of benzene

HURRY ANSWER NOW AND I GIVE BRAINLY!!! HURYYY
1. A student left a sealed jar of water outside her home. Water can be a solid, liquid, or gas. When she put it outside, the water was a solid. Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?

Answers

When the student left the jar outside, the molecules were moving around each other. Later, the molecules were moving away from each other.

Answer:

A. "before the student left, the molecules we're moving in place. After, the molecules we're moving around each other.

Explanation:

Hope this helps. Please mark as brainliest if it did. :)

How can people conserve water at home?

rinsing dishes with cold water instead of warm water
washing dishes only when the dishwasher is full
bathing pets with a hose instead of a bucket
eating fish bought from the store

Answers

Answer:

washing dishes only when the dishwasher is full

Explanation:

Out of the following options, the best way to conserve water is:

B. washing dishes only when the dishwasher is full

Ways to conserve water:

Conserving water is important because it keeps water pure and clean while protecting the environment.

Turn off the faucet while brushing your teeth.Only run the washing machine and dishwasher when you have a full load.Use a low-flow showerhead and faucet aerators.Fix leaks.Take a Shower of 5 Minutes or Less. Install a Water-saving Toilet Flush System.

Thus, option B is correct.

Find more information about Water here:

brainly.com/question/5060579

which substance will experience the greatest temperature change if 100J of energy is used to warm it? 100g of moist air, 100g of water or 100g of ice​

Answers

Sensible temperature change will be greatest for 100

Which of the 3 sub particles of an atom, weighs the LEAST?

Answers

Answer:

Electron, as it carries a negative charge

Explanation:

plz help me with this :)

Answers

Answer:

they are randomly moving

Explanation:

Answer:

B

Explanation:

Red shift indicates that stars are moving further away.

Please help!!
It’s due today

Answers

Answer:

There is nothing with data to help us complete this chart

THIS IS BAD. THIS IS REALLY BAD

Explain how to identify a starting position on a line.

Answers

Displacement is defined as the distance, in any direction, of an object relative to the position of another object. Physicists use the concept of a position vector as a graphical tool to visualize displacements. A position vector expresses the positionof an object from the origin of a coordinate system

Answer:

Pick a reference point on the line to be the zero position. Determine the direction and measure the distance from zero in standard units.

Explanation:

What is the answer for number 2?

Answers

Answer:

It has mass but no charge.

Explanation:

The question asks to describe ONE of the subatomic particles that could be found at location X in the model, so you should think of protons and neutrons. Now all of the answers do NOT describe a proton, but the first answer describes a neutron. Neutrons have mass but no charge. Why? The neutron has two down quarks and one up quark, down quarks, have a charge of -1/3, and up quarks have a charge of +2/3. Doing the math, you'd see that (-1/3)2+2/3 is equal to a neutral charge. So a neutron WILL have a mass, but will NOT have a charge, as they are used to hold the nucleus together.

Answer:

the last one

Explanation:

Which of the following halogens has the weakest attraction for electrons?


I


F


Br


Cl

Answers

Answer:

I

Explanation:

Among the halogens given in this problem, iodine has the lowest attraction for electrons.

This property is known as electronegativity.

Electronegativity is expressed as the relative tendency with which the atoms of the element attracts valence electrons in a chemical bond.

As you go down the periodic group the electronegativity decreases. The most electronegative element on the periodic table is fluorine. Down the group, iodine is the least electronegativeThis is due to the large size of its atom.

What are two uses of sulfur?​

Answers

Answer:

It's used in the vulcanisation of black rubber, as a fungicide and in black gunpowder and a production of sulfuric acid.

Explanation:

Explain in a short sentence how you can tell if a reaction is a combustion reaction.

Answers

The reactants react with oxygen and there is energy formed.

To Identify a mineral, there are tests that are used including:

Answers

Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.

USE LETTERS FOR ANSWERS, NO NEED TO EXPLAIN
a) Substitute symbols and formulas for words.
b) Predict the products. If no reaction occurs, write “NR” after the --> sign. c) Include abbreviations for the physical state.
d) Write out and balance the equation.

6. Mercury is poured into an aqueous solution of zinc nitrate.

7. Solutions of potassium iodide and lead (II) nitrate are mixed. The resulting lead compound is a precipitate.


thank you! :)

Answers

Answer:

Ok:

Explanation:

6a) [tex]Hg + Zn(NO_3)_2\\[/tex]

b) NR

c) [tex]Hg_{(l)} + Zn(NO_3)_2 {(aq)}=> NR[/tex]

d) Welp, no reaction so i don't know.

7a) [tex]KI + Pb(NO_3)_2[/tex]

b) [tex]PbI_2 + KNO_3[/tex]

c) All are aqeuous except for PbI2 which is solid

d) [tex]2KI _{(aq)}+ Pb(NO_3)_2_{(aq)} => PbI_2_{(s)} + 2KNO_3_{(aq)}[/tex]

Check if that is ok or if my work has any issues :).

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