Which of the following is a compound that contains 2 different elements?

A chlorine
B oxygen
C carbon dioxide
D magnesium

Answers

Answer 1
Chlorine is the correct answer so A

Related Questions

g Predict the hybridization about the central atom in the given structure. A molecule with atom Y single bonded with 3 X substituents. The Y atom has two lone pairs.

Answers

Answer:

sp3d

Explanation:

The Central atom Y is singly bonded to 3 X substituents and it has two lone pairs.

An example of compound that fits this description is BrF3.

The central atom used d orbitals for hybridization.

The 2 lone pair plus three single bond equals 5.

As the hybridization value is equal to 5 it gives rise to sp3d hybrid orbitals.

A sample initially contains 8.0 moles of a radioactive isotope. How much of the sample remains after four half-lives? Express your answer using two significant figures.

Answers

Answer:

0.50 mol

Explanation:

The half-life is the time required for the amount of a radioactive isotope to decay to half that amount.

Initially, there are 8.0 moles.

After 1 half-life, there remain 1/2 × 8.0 mol = 4.0 mol.After 2 half-lives, there remain 1/2 × 4.0 mol = 2.0 mol.After 3 half-lives, there remain 1/2 × 2.0 mol = 1.0 mol.After 4 half-lives, there remain 1/2 × 1.0 mol = 0.50 mol.

which statement best describes an example of selective breeding?​

Answers

Answer:

B people control how plants or animals reproduce to get desired traits

Explanation:

if you get it correct mark meh brainliest or however you say it so ppl know its correct

You are given 4.92 grams of H2O. How many moles is that?

Answers

Answer:

0.273 mol H₂O

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic TableUsing Dimensional Analysis

Explanation:

Step 1: Define

4.92 g H₂O

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

[tex]4.92 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O} )[/tex] = 0.27303 mol H₂O

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

0.27303 mol H₂O ≈ 0.273 mol H₂O

Which element has 6 valence electrons? The Periodic Table O A. Carbon (C) O B. Barium (Ba) O C. Selenium (Se) O D. Lithium (Li)​

Answers

Answer:

c) selenium

Explanation:

Selenium is present in group sixteen.

It has six valance electrons.

Its atomic number is 34.

Atomic mass of selenium is 78.96 amu.

Electronic configuration pf selenium:

Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

we can see there are six valance electrons are present in selenium (4s² 4p⁴).

Valance electrons are those electrons which are present in outer most  electronic shell.

Other options are incorrect because,

There are  4 valance electrons in carbon.

2 valance electrons of barium.

one valance electron of lithium.

what are some characteristics of the structure of DNA

Answers

Answer:

Explanation:

DNA is composed of two side-by-side chains (“strands”) of nucleotides twisted into the shape of a double helix. ...

The bases are attached to the 1′ carbon of each deoxyribose sugar in the backbone of each strand. ...

The association of A with T and G with C is through hydrogen bonds

Calculate the number of gold atom
present in 0.6g of 18 carat gold (24 carat
gold is taken as 100%
where and amu of
gold in 197
Teacher's Signature.

Answers

The number of gold atom : 1.204 x 10²¹

Further explanation

Given

0.6 g of 18 carat gold

mass number of gold = 197

24 carat as 100% gold

Required

The number of gold atom

Solution

Percentage of gold in 18 carat :

[tex]\tt \dfrac{18}{24}\times 100\%=75\%[/tex]

Mass of gold in 0.6 g of 18 carat :

[tex]\tt 75\%\times 0.6~g=0.45~g[/tex]

mol :

[tex]\tt mol=\dfrac{mass}{MW}=\dfrac{0.45}{197}=0.0023[/tex]

A mole is a number of particles(atoms, molecules, ions)  in a substance

1 mole = 6.02.10²³ particles  

So the number of gold atom :

[tex]\tt 0.0023\times 6.02\times 10^{23}=1.204\times 10^{21}[/tex]

How many grams of H2O are needed to produce 150. g of Mg(OH)2?

Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(aq) + 2NH3(g)

Answers

Answer:

About 92.67 grams of H2O are required

Explanation:

The easier way for some people is to work backwards.

Since we already have the amount of grams produced (for Mg(OH)2), we can just start from there.

In order to find the amount of grams of H2O needed we need to know the amount of moles actually used in the chemical reaction.

We can find this using the balanced chemical equation to convert from grams of Magnesium Hydroxide to moles of Magnesium Hydroxide to moles of Water and finally to grams of Water.

**58.319 g is the amu (molar mass) of Mg(OH)2

Step 1 ->  150 g Mg(OH)2 * [tex]\frac{1 mol Mg(OH)_{2} }{58.319 g Mg(OH)_{2} }[/tex]  = 2.572060563 moles

We can round that to 2.572 moles of Mg(OH)2 produced.

Step 2 -> Now we can convert from moles of Mg(OH)2 to moles of H2O

We will do this using the balanced chemical equation

2.572 moles Mg(OH)2 *[tex]\frac{ 6 moles H2O}{3 moles Mg(OH)2}[/tex] = 5.144 moles of H2O required

Step 3 -> Now we will convert from moles of H2O (water) to grams

**Using the amu (molecular mass)

The molecular mass of water is about 18.015 grams

5.144 moles * [tex]\frac{18.015 grams H_{2}O }{1 mol H_{2}O}[/tex] = 92.66916 grams of H2O

So, about 92.67 grams of H2O are required

please help me I will give a brainleist to anyone who answers​

Answers

Answer:

4

Explanation:

What is the mass percentage of JUST water in the hydrate CuSO4 ∙5H2O? The molar mass for the whole compound is 249.71 g/mol.

Answers

answer: 29x90=103

Kjjjj

every spring has an equilibrium position. which statement describe a spring at its equilibrium postion? Check all that apply.

Answers

Answer:

The elastic potential energy is zero.

The net force acting on the spring is zero.

have a great day <333

Isabel and Ruth scored a total of twenty-two points in their last basketball game scored two more points than Isabelle.How many points did Isabel score?
A:2x-2=22; x=12
B:x+2=22; x=20
C:2x+2=22; x=10
D:2x+2=22; x=12

Answers

isabel is represented as x

ruth is represented as x+2

so the equation would be

x+(x+2)=22

the (x+2) is ruth. so to check if its right solve it. 2x+2=22

-2 -2

2x+20

__ ___

2 2

x=10

so now you know that isabel scored 10 goals since she was x. to figure out ruth just add 2.

PLSSSSSSSSS HELP!!!!!!!! FIRST TO AWNSER GETS BRAINLIEST!!!!!!!!


Research four illnesses that afflict humans. Each illness should be caused by a pathogenic organism of a different type:
an illness caused by a bacterium
an illness caused by a virus
an illness caused by a fungus
an illness caused by a protist

Answers

Answer:

measles are caused by virus

strep throat is caused by bacterium

aspergillosis caused by fungus

malaria caused by protist

hope this helps!

Explanation:

measles are caused by a virus

7,5,3,6,9
what three numbers add up to 12​

Answers

Explanation:

3+3+6=12 is the three numbers adding up to 12

HELP PLS THIS IS DUE IN 5 MINUTES!!

Answers

Answer:

it is a soft and very cold molocules but at the touch of a hand it will melt because of how compact the molocules are

Explanation:

gallium can only stay a solid under 85.59°F so is someone had is in there had is would end up like ice cream

How is a warm front formation diffrent from occlued front formation​

Answers

Answer:  Two cold air masses surround a warm air mass during a warm front, but a cold air mass moves against a warm air mass during an occluded front.

what's the importance of anatomy for pharmacy students​

Answers

All health professionals, including pharmacists, must be able to relate form to function..a grounding in anatmony is an essential foundation on which to underpin other knowledge relevant to clinical practice.

All Health professionals, including pharmacists, must be able to relate form to function: a grounding in anatomy is an essential foundation on which to underpin other knowledge relevant to clinical practice, as well as other basic sciences studied as part of the Master's in Pharmacy (MPharm) Degree programme

19. H2O, CO2, CaCl2, and Na2CO3 (the numbers are subscripts) are all examples of that tell which atoms and how much of each atom is needed to make a molecule of a substance.

A.chemical formulas
B.types of atoms
C.elements​

Answers

Answer:

A. Chemical formulas

Explanation:

Hello!

In this case, since chemical formulas are written or drawn representations of what atoms and how much of them are present in a molecule, which is composed by two or more different atoms, we can infer that molecules such as H2O (water), CO2 (carbon dioxide), CaCl2 (calcium chloride) and Na2CO3 (sodium carbonate) are given as a. Chemical formulas, because we can see there are two hydrogens and one oxygen in water, one carbon and two oxygens in carbon dioxide, one calcium and two chlorines in calcium chloride and two sodiums, one carbon and three oxygens in sodium carbonate.

Best regards!

Answer the question pls answer this and it’s due in 4 minutes!!. Help

Answers

Answer:

the first one is gas and the second one is liquid

Which factor affects a solute's solubility rather than its rate of solution?
OA. Nature of the solvent
O B. Size of solute particles
OC. Amount of solute particles
O D. Shaking of the solvent

Answers

Answer: A

Explanation:

I took the test it was A

PLEASE HELP
Answer the following about this chemical equation: Na + MgF2 ---> NaF + Mg

What are the reactants?
What are the products?
Is the equation balanced?

Answers

Answer:

The reactants are the first two before the arrow and the products are the last two after the arrow, it is not balanced it would look like this if it was balanced:

2Na+MgF2–>2NaF+2Mg

What occurs in electroplating?

Deposition of a metal layer on a material

Deposition of a salt layer on a metal

Decomposition of a salt layer

Decomposition of a metal layer

Answers

I think it’s the first one. Electroplating means you put on a layer of metal on something.

what is photosynthesis​

Answers

Answer:

the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

Explanation: You can put this in your own words. How? Well, try to find the most important stuff in your own words and write it down.

The air in a 4.50 L tank has a pressure of 1.40 atm . What is the final pressure, in atmospheres, when the air is placed in tanks that have the following volumes, if there is no change in temperature and amount of gas?

a. 1.00 L
b. 2500. mL
c. 750. mL
d. 8.00 L

Answers

Answer:

a. 6.30 atm.

b. 2.52 atm.

c. 8.40 atm

d. 0.788 atm

Explanation:

Hello!

In this case, since the Boyle's law was proposed in order to understand how the volume and pressure are related via an inversely proportional relationship:

[tex]P_2V_2=P_1V_1[/tex]

In order to compute the final pressure we use:

[tex]P_2=\frac{P_1V_1}{V_2}[/tex]

Therefore we proceed by using same volume units as follows:

a.

[tex]P_2=\frac{4.50L*1.40atm}{1.00L}=6.3atm[/tex]

b.

[tex]P_2=\frac{4.50L*1.40atm}{2.5L}=2.52atm[/tex]

c.

[tex]P_2=\frac{4.50L*1.40atm}{0.750L}=8.4atm[/tex]

d.

[tex]P_2=\frac{4.50L*1.40atm}{8.00L}=0.788atm[/tex]

Best regards!

Describe how you could feel weightless on Earth.

Answers

Gravity is a force that acts between the Earth's mass and the mass of other objects that surround it. ... Astronauts merely feel weightless because there is no external contact force pushing or pulling upon their body. They are in a state of free fall.

Question 54
Which one of the following substances is classified as a molecular element?
a.KCI
b.12
c. NO
d.CO
e. C6H12O6

Answers

I really hope and think it’s E

I2 is classified as a molecular element.

A molecular element is a molecule that is composed of two or more atoms of the same type that are chemically joined together.

The substance that fits this description is I2. It consists of two iodine atoms joined together.

Hence, I2 is classified as a molecular element.

Learn more; https://brainly.com/question/19922822

Select the correct answer.
In this course, you will be learning about which of the following topics:
A. Advantages and challenges of Childcare
B. Organizational Skills
C. Home Safety
D. All of the above

Answers

D?

Explanation:

considering they're all similar options I'd assume D, but there isn't any context

I assume D not really sure but there was no background info sooo...

A chemist measures the mass of an unknown substance. The mass is 2.53 g. Which statement best describes the chemist measurement

a : it’s is a qualitative inference
b : it is a quantitative inference
c : it is a qualitative observation
d : it is quantitative observation

Answers

Answer:

D) it is quantitative observation

The chemist measurement is a quantitative inference and the correct option is option B.

What is the difference between quantitative and qualitative measurement?

Quantitative means measuring a quantity - putting a value to something.

For example, The rate of a reaction can be measured by measuring the time it takes for a change to happen, such as the time taken for a piece of magnesium ribbon to dissolve in acids of different concentrations.

Qualitative means without determining a value.

This is usually done by making a comparison, e.g. the magnesium dissolves more quickly in this acid than in that one, or making observations like lithium compounds produce a red flame colour while sodium compounds produce a yellow one.

Therefore, the chemist measurement is a quantitative inference and the correct option is option B.

Learn more about Quantitative and Qualitative measurement, here:

https://brainly.com/question/30366950

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How was the periodic law rearranged to become the periodic table, and what is its purpose?

Answers

Answer:

At earlier times elements were arrangrd on the basis of their atomic masses to study their properties easily but there were various problems like isotopes needs different position in perodic table.

After discovery of atomic number modern periodic table was created on the basis of atomic number (number of proton) that is unique for each element and varies regularly. So study of a group of elements is much easier than each element seperately that is why modern periodic table was formed.

Explanation:

What is the maximum amount of ammonia that can be produced when 0.35 mol Nz reacts with 0.90 mol Hz?

Answers

Answer:

0.6 moles NH₃

Explanation:

The reaction that takes place is:

N₂ + 3H₂ → 2NH₃

First we determine the limiting reactant:

0.35 mol N₂ would react completely with (3*0.35) 1.05 moles of H₂. There are not as many H₂ moles, so H₂ is the limiting reactant.

Then we convert H₂ moles (the limiting reactant) to NH₃ moles, keeping in mind the stoichiometry of the reaction:

0.90 mol H₂ * [tex]\frac{2molNH_3}{3molH_2}[/tex]= 0.6 moles NH₃

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