Which measurement shows the correct degree of precision for this ruler?
a. 1.5 cm
b. 1 cm
c. 1.55 cm

Answer:

1.0 is Answer

Explanation:

May be this is helpful!

That would be B: 33%, but please correct me if I'm wrong ^^

Answer:

that would be b:33 i believe pls dont blame met

Answer:

a.cocentration es la respuesta

Answer:

True

Explanation:

Those bases which are soluble in water are called alkalis

Answer:

A. Each amino acid has an amino group and a carboxyl group.

Answer:a

Explanation:

Answer:

:)

Explanation:

They are all properties of Matter. weight and formula wouldn't make sense.

Answer:

Joules first law is a law that expresses the relatioship between heat that is generated and the current flowing heat thats through a conductor. The second law says that internal energy is independent of volume and pressure, depending only on temperature!

Explanation:

Answer: The elements of the cyanoacrylate are different as compared to the main cyanoacrylate.

Explanation:

The cyanoacrylate is a adhesive water based substance. It is used for developing fingerprints by fuming method. It is the acrylic monomer which has property to develop into a plastic form after application another of its composition is the acrylic resin which imparts adhesiveness to the cyanoacrylate.

Answer:

Hrishikesh. bshjsjbd. jwjjja

Answer:

Yes it does because the atoms/molecules are moving faster than they are in a cold substance.

Explanation:

Answer:

Cold Front. A side view of a cold front (A, top) and how it is represented on a weather map (B, bottom). ...

Warm Front. ...

Stationary Front. ...

Occluded Front.

The concentration of this acid in moles per litre : 17.41

Given

99.5% acetic acid

density=ρ=1.05 g/ml

Required

the concentration (mol/L)

Solution

99.5% dan density 1.05 g/ml (MW acetic acid = 60 g/mol)

[tex]\tt 99.5\%\times 1.05\dfrac{g}{ml}\times \dfrac{1000~ml}{L}=1044.75~g/L\\\\\dfrac{1044.75~g/L}{60~g/mol}=17.41~mol/L[/tex]

Given :

A gas with a volume of 2 L at 25°C is placed into a container that is 4 L.

To Find :

The new temperature of the gas.

Solution :

Since, their is no information regarding pressure. We will assume that pressure is constant.

Now, we know when at constant pressure, volume is directly proportional to volume.

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\\dfrac{2}{4} = \dfrac{25 + 273 }{x}\\\\x = 2 \times ( 25 + 273 )\\\\x = 596\ K[/tex]

Therefore, the new temperature of the gas is 596 - 273 K = 323  K.

Answer:

202.5 K

Explanation:

Answer:

fossil evidence

fit of South America and Africa

Explanation: can i have brainlist please

Answer:

1.63 mols

Explanation:

to convert mols to formula unit, or formula unit to mols, u need the avagadros number which is 6.022*10^23 and the number of mols/formula units

so since the given is formula units, u just have to divide the number by 6.022*10^23 to get the amount of mols

9.82*10^23 / (6.022*10^23) = 1.63 mols

*be careful for sig figs

Answer:

d = 5.23 g/cm³

Explanation:

Given data:

Volume of metal chips = 3.29 cm³

Mass of metal chips and paper = 18.43 g

Mass of paper = 1.2140 g

Density of metal = ?

Solution:

Mass of metal = combined mass - mass of paper

Mass of metal = 18.43 g - 1.2140 g

mass of metal = 17.22 g

Density:

d = mass/ volume

d = 17.22 g/ 3.29 cm³

d = 5.23 g/cm³

Answer:

c

Explanation:

solid to gas directly

Answer:

The correct answer would be C

Explanation:

Plz correct me if wrong

The condition in which sugar is most likely to dissolve fastest in a cup of water is when sugar crystals with stirring at 15°C. Therefore, option C is correct.

Dissolution is the process by which a solute dissolves in a solvent to form a homogeneous mixture called a solution. The conditions required for dissolution are:

Thus, option C is correct.

Learn more about dissolution, here:

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Answer:

four elements

Explanation:

He = 1s²

Be = 1s² 2s²

C = 1s² 2s² 2p²

Mg = 1s² 2s² 2p⁶ 3s²

Si = 1s² 2s² 2p⁶ 3s² 3p²

Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

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

He, Be, Mg, Ca these four elements have 2 valence electrons.

While Si and C have four valance electrons.

The total number of the elements above with 2 valence electron is four.

The electronic configurations of the elements are given:

He = 1s²

Be = 1s² 2s²

C = 1s² 2s² 2p²

Mg = 1s² 2s² 2p⁶ 3s²

Si = 1s² 2s² 2p⁶ 3s² 3p²

Ca = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

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

Learn more:

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Answer: 1.5 x 10 24

Explanation:

One mole of NaCl contains 6.022 x 1023 NaCl formula units

In 2.5 moles of NaCl there will be basically 5 moles of ions as per the given data.

A material created by joining two or more distinct elements chemically in science.

A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion.

Chemical connections that are challenging to break are created when the elements interact with one another.

2.5 mol of NaCl contains 5 moles of ions. This is due to the fact that 1 mol of NaCl contains 2 mol of ions, so you must multiply the molecular weight of the molecule by two to obtain the number of ions.

Thus, the answer is 5 moles.

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Answer:

The element you would have is Carbon-14.

Explanation:

Carbon-14 has 6 protons and 8 neutrons. To find the atomic mass, you add the protons to the neutrons, so the atomic mass of Carbon-14 is 14.

#teamtrees #WAP (Water And Plant)

Moles of Aluminum needed : 0.8

Given

1.2 moles H₂

Required

moles of aluminum

Solution

The reaction coefficient in a chemical equation shows the mole ratio of the components of the compounds involved in the reaction (reactants and products)

Reaction(balanced equation)

2Al + 6 HCl = 2AlCl₃ + 3H₂

From the equation, mol ratio of Al : H₂ = 2 : 3, so mol Al :

= 2/3 x mol H₂

= 2/3 x 1.2

= 0.8 moles

Answer:

%composition of B₂ = 4.3%

%composition of Br₆ = 95.7%

Explanation:

Given data:

Percent composition of B₂Br₆ = ?

Solution:

Total mass of B₂Br₆ = 10.8×2 + 79.9×6 = 501 g/mol

%composition of B₂ = ( 21.6 g/ 501 g ) × 100

%composition of B₂ = 0.043 × 100

%composition of B₂ = 4.3%

%composition of Br₆ = ( 479.4 g/ 501 g ) × 100

%composition of Br₆ = 0.957 × 100

%composition of Br₆ = 95.7%

Answer:

M₂ = 0.34 M

Explanation:

Given data:

Molarity of NaOH =M₁ =  0.200 M

Volume of HF =V₂=  18.25 mL

Volume of NaOH added = V₁ = 31.20 mL

Molarity of HF solution = M₂ = ?

Solution:

M₁V₁  =  M₂V₂

by putting values,

0.200 M × 31.20 mL = M₂ × 18.25 mL

M₂ = 0.200 M × 31.20 mL /  18.25 mL

M₂ = 6.24 M.mL / 18.25 mL

M₂ = 0.34 M

Answer:

The way you can know which compound in a solution is a solvent is by usually just determining which substance is a solute and which is a solvent. The solute is when it is dissolved and it takes on the characteristics of the solvent.

Explanation:

Hope this helps!

Answer:

Molarity = 0.28 M

Explanation:

Given data:

Mass of NH₄NO₃ = 18.9 g

Volume of solution = 855 mL (855mL × 1 L/1000 mL = 0.855 L)

Molarity of solution = ?

Solution:

Number of moles of NH₄NO₃:

Number of moles = mass/molar mass

Number of moles = 18.9 g/ 80.043 g/mol

Number of moles = 0.24 mol

Molarity:

Molarity = number of moles of solute  / volume in L

Molarity = 0.24 mol /0.855 L

Molarity = 0.28 M

Answer:

0.28

Explanation:

:D