Chemistry pick two answers

Answer:

2044

Explanation:

Answer:

Explanation:

If you have options, could you please tell me so I can further help you. If you just need an example then

Examples of pure substances include iron, steel, and water

Hope this helps (:

Answer

These are the following answers

A) zinc oxide

B) sugar dissolved in water

C) pond water

D) soil

Explanation:

Answer:

586 kpa(kilopascal/1000 pascals)

Explanation:

given 1.24 atm(standard atmosphere), and 66.7 psi(pound force per square inch).

To find the total pressure we should use dalton's law of partial pressures which is the sum of the pressures of each individual gas.

then we convert them to pascals and divide by 1000 to get the measurement in kilopascal.

knowing that 1 atmosphere is proportional to around 14.696 psi. We can multiply our given measure of atm by that and sum it by psi like so. 1.24×14.6959 = 18.22298.

Then,

18.22298+ 66.7 = 84.92298

psi.

Since 1 psi is proportional to around 6894.76 pascals. 1 psi will be 68.9476 kilopascal. 84.92298 * 6.89476 = 585.523336 ≈ 586

Answer:

double replacement

Explanation:

just did it

Answer:

Double replacement

Explanation:

Answer:

Styrofoam could be heavier than a rock depending on how much weight you put on it,

Water is heavier than a ping pong ball,

A gold ring is not heavier than a pencil,

Oil is heavier than water because of the combined mass.

A large log is heavier than a small rock.

Explanation:

Answer:

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

Explanation:      

Given:

Desired dose (D)= 1 mg

Dose in hand (H) = 10 mg

Quantity (Q) = 1 ml

Computation:

Volume(ml) of drug = [Desired medicine / medicine in hand] Quantity.

Volume(ml) of drug required = [1/10]1

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

Answer:

The answer is

Explanation:

The number of molecules can be found by using the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 2 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

As those microbes thrive, they will release large amounts of methane, another climate-warming greenhouse gas. ... By the year 2100, they estimated, thawing permafrost could release enough carbon dioxide and methane to raise the average global temperature by 0.13 to 0.27 degree C (0.23 to 0.49 degree F). pls mark me brainlest :(

Explanation:

Given that,

Mass number of Ge = 70

Then,

Atomic number of Ge = 32

No. of protons = 32

No. of electrons = 32

No. of neutrons,

→ 70 - 32 = 30

Answer:

30 is correct

Explanation:

70 - 32 = 30 mark as brainliest

The azimuthal quantum number and magnetic quantum number corresponds to the s orbital is zero. Hence, there is only one m value and thus contains one orbital only.

The quantum numbers are numbers used to describe the position of an electron within an orbital. The principal quantum number n indicates the main energy level. The azimuthal quantum number l indicates the shape and type of orbital which have values from 0 to n-1.

The magnetic quantum number m indicates the number of orbitals for a sublevel. m can have values from + l to -l. The fourth quantum number s is called spin quantum number. For an electron the spin quantum number can be +1/2 or -1/2.

The n value for the 6s sublevel is 6. The azimuthal quantum number , l for an s orbital  is zero. So its m quantum number has only one value that is zero. Hence, there is only one orbital in 6s sublevel.

Find more on quantum numbers:

https://brainly.com/question/16979660

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Answer:

The correct approach is "3.1×10⁻³ M".

Explanation:

As we know,

[tex]pH=-log[H_{3}O^+][/tex]

[tex]pH=2.5[/tex]

[tex][H_{3}O]^+= \ ?[/tex]

Now,

⇒ [tex]-log[H_{3}O]^+=2.5[/tex]

⇒ [tex][H_{3}O]^+=10^{-2.5}[/tex]

⇒             [tex]=3.1\times 10^{-3} \ M[/tex]

So that the needed molar concentration of HCL will be:

= [tex]3.1\times 10^{-3} \ M[/tex]

Answer:

Pure covalent

Explanation:

To know the type of bond between two atoms you must find the electronegativity difference of them:

If electronegativity difference is:

< 0.4: Pure covalent.

Between 0.4 and 1.8: Polar covalent.

> 1.8: Ionic.

The electronegativity of Zn is 1.65 and Ni is 1.91. Electronegativity difference is:

1.91 - 1.65 =  0.26

That means the type of bond is:

Answer:

317.6 mL

Explanation:

Step 1: Write the balanced neutralization equation

MgO + 2 HCl ⇒ MgCl₂ + H₂O

Step 2: Calculate the mass corresponding to 640.0 mg of MgO

The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:

0.6400 g × (1 mol/40.30 g) = 0.01588 mol

Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO

The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol

Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles

0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL

Answer:

D solid

Explanation:

Answer:

The liquid can be identified

Explanation:

Given that density is defined as mass per unit volume.

We have the following information regarding the unknown liquid;

Mass= 1.40 kg = 1400 g

Volume = 1378 cm^3 = 1378 ml

Density of unknown liquid = 1400/1378 = 1.012 g/ml this is approximately 1.0 g/ml

It is possible to identify the liquid, the liquid is ethanolamine

Answer: anhydrous CaCl 2 :0H 2 O

monohydrate CaCl 2 :1H 2 O

a di-hydrate CaCl 2 :2H 2 O

Explanation:

Answer:

92.65256 cm^3

Explanation:

To find this, we can simply multiply all three dimensions to get the answer in cubic centimeters, and we get the answer above. If you want to be more specific, we can go by the sigfig rule and the answer would be rounded to 93 cm^3.

Answer:

79.904 u for bromine

24.305 u

Not really sure what the 3rd question is asking

Explanation:

Gas Has A Volume Of 2.21 L At 287 K And 1.11 Atm. Calculate The Pressure When The Volume Is 1.03 L And The Temperature

Explanation:

Answer:

The correct answer is C. None of the above.

Explanation:

To determine how long the black bear will run, the distance it will travel must first be determined. Thus, the proposed calculation must be solved.

1.95 x 10 ^ 4

1.95 x 10 x 10 x 10 x 10

19.5 x 10 x 10 x 10

195 x 10 x 10

1950 x 10

19500

Thus, the bear will run 19,500 miles, so, running at 35 mph, it will take about 557 hours to run that distance (19,500 / 35).

Answer:

A.Br

Explanation:

Bromine is the only gas from the choices provided. It belongs to the group of halogens, group 7.

It has atomic number of 35 and it belongs to the p-block on the periodic table.

Only Bromine is the gas from the given choices. It is fuming liquid and when exposed, it becomes gaseous.

Answer: The answer is blue, white, yellow-white, orange.

Explanation: These are the two basic reasons for different star colors:

Temperature – cooler stars are red, warmer ones are orange through yellow and white. The hottest stars shine with blue light

Age – As a star ages it produces different chemicals which burn at different temperatures. We can use a star’s color to show its relative age

Answer:

OR D

Explanation:

D on edge 2020

Answer:

b. only weather includes information about the temperature

Answer:

B. 3.0 g/ml

Explanation:

density formula: mass/volume

15/5=3

Answer:

The rest of the food molecule is converted to other carbon molecules. The hawk cannot consume all the parts of the squirrel. It will feed as a carnivore on the fleshy part of its prey. The matter is converted to other carbon molecules

Explanation: