Material
Appearance of the material,
including its color and state
baking soda
baking powder
Salt
sugar
flour
vinegar
cooking oil

195 g×

1 mol

Ni(OH)

2

92.71

g Ni(OH)

2

×

6.022×

10

23

formula units

mol

=1.27×

10

24

formula units of Ni(OH)

2

Since there are  

5

atoms—one  

Ni

atom, two atoms of  

O

and two atoms of  

H

—in each formula unit of  

Ni(OH)

2

,

we multiply the number of formula units calculated above by  

5

:

1.27×

10

24

formula units of Ni(OH)

2

×

5 atoms

formula unit of Ni(OH)

2

=6.33× 10^ 24  total atoms  

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms

Explanation:

Given:

The 195 grams of nickel(II) hydroxide,[tex]Ni(OH)_2[/tex] .

To find:

The total number of atoms in 105 grams of nickel(II) hydroxide.

Solution:

The mass of nickel(II) hydroxide = 195 g

The molar mass of nickel(II) hydroxide = 92.708 g/mol

The moles of nickel(II) hydroxide:

[tex]=\frac{195 g}{92.708 g/mol}=2.10 mol[/tex]

According to the mole concept:

1 mole =[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex]

The number of molecules of nickel(II) hydroxide =

[tex]N=2.10 mol\times 6.022\times 10^{23} mol^{-1} =1.26\times 10^{24} molecules[/tex]

In 1 molecule of nickel(II) hydroxide there is 1 nickel atom, then in N molecules of nickel(II) hydroxide:

[tex]=1\times 1.26\times 10^{24} atom=1.26\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 oxygen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 hydrogen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

The total number of atoms:

[tex]=1.26\times 10^{24} atoms+2.52\times 10^{24} atoms+2.52\times 10^{24} atoms=6.30\times 10^{24} atoms[/tex]

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms.

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Answer:

which statements

Explanation:

Answer:

The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

Explanation:

I just took the assignment.

Explanation:

Label A: oceanic - oceanic

Label B: oceanic - continental

Label C: continental - continental

Answer:

Oceanic-continental convergence---- letter B.  

Oceanic-oceanic convergence ---- letter A.

Continental-continental convergence ---- letter C

plz mark brainliest

Answer: Sediment is important because it often enriches the soil with nutrients. Areas rich in sediments are often also rich in biodiversity. Sedimentary soil is usually better for farming. Deltas and river banks, where much sediment is deposited, are often the most fertile agricultural areas in a region.

Answer:

bubbled

Explanation:

its simple they bubbled

signs of chemical reactions are change of

odor

bubbles

solid turns liquid

liquid turns solid

change of color

Answer:

3.4

Explanation:

Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: 2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)

At a certain temperature, a chemist finds that a 9.5L reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition:

compound amount

HNO₃ 15.5g

NO 16.6g

NO₂ 22.5g

H₂O 189.0g

Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.

Step 1: Write the balanced equation.

2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)

Step 2: Calculate the molar concentration of the species at equilibrium

We will use the following expression.

M = mass of solute / molar mass of solute × liters of solution

[HNO₃] = 15.5g / 63.01 g/mol × 9.5 L = 0.026 M

[NO] = 16.6g  / 30.01 g/mol × 9.5 L = 0.058 M

[NO₂] = 22.5g  / 46.01 g/mol × 9.5 L = 0.051 M

We do not calculate the molarity of water because it is a pure liquid and will not be included in the equilibrium constant.

Step 3: Calculate the equilibrium constant (Kc)

Kc = [NO₂]³/[HNO₃]²×[NO]

Kc = 0.051³/0.026²×0.058

Kc = 3.4

Answer:

22.5mL is the volume of the water

Explanation:

When the graduated cylinder is  in the 25.0mL mark, the mass of this volume is 22.4g. To convert this mass to volume we need to use density, as follows:

22.4g × (1mL / 0.99704g) = 22.5mL is the volume of the water.

That means the cylinder is uncalibrated in 2.5mL when the cylinder is in the 25.0mL mark

Answer:

Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.

Explanation:

The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.

The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.

As evident in the case above;

Ultimately, an ionic bond is formed between the Mg and O atoms.

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it is never greater than the atomic number.

OR,

Thank you ☺️☺️

Answer:

268.3 m/sec

Explanation:

Answer:

B. 8

Explanation:

Answer:

8.54 * 10^15 J

Explanation:

For Co-59

Protons- 27

Neutrons- 32

total calculated mass of protons = 27 * 1.00783 amu = 27.211 amu

total calculated mass of neutrons = 32 * 1.00866 amu =37.320 amu

Total calculated mass of nucleons = 27.211 amu + 37.320 amu = 64.531 amu

Mass defect = 64.531 amu - 58.933198 amu = 5.5978 amu

Binding energy = E=(Δm)c^2

Δm= mass defect

c=  speed of light

E=  5.5978 amu (3.0 *10^8)^2

E= 5.03 * 10^17 J

Binding energy per nucleon = Binding energy/ total number of nucleons

= 5.03 * 10^17 J/ 59 = 8.54 * 10^15 J

Answer:

Frogs have three circuits for their circulation, unlike humans who only have two. Like humans, however, frogs have a systemic circuit, which pumps oxygenated blood throughout the body. The pulmonary circuit moves blood to the lungs to pick up oxygen.

Explanation:

Answer:

A

Explanation:

Answer:

B. The hot water mixes all through the vial

Explanation:

The hot water is able to mix all through the vial because when water is heated, it's molecule are loosed. They are able to speed up and spread, occupying a larger volume. Hot water is less dense than room-temperature water and the hot water can float on room-temperature water.

Answer:

Pressures and temperatures

Explanation:

In deciding the new substances that develop in a metamorphic stone, pressures and temperatures are major factors. Under various conditions of pressure and temperature, various minerals form.

Metamorphic rocks are classified that, extreme heat and strain, have altered shape. Metamorphic derives from the terms meta and morph in german. Meta means alteration and morph means shape. So, to alter shape, we get metamorphosed significance.

Answer:

chemical reactions

Explanation:

Answer:

chemical reactions

Explanation:

Chemical reactions like weathering can cause rock and earth movement, plants grow from rain which is weathering, snow is weathering and cold winters is freezing water. I don't see how flowing water can contribute to weathering because in rivers, creeks, etc, always flowing. So if flowing water is always moving, it's not caused by weathering.

I EDITED MY ANSWER:

Physical weathering is caused by purely mechanical changes to the rock, while chemical weathering is caused by chemical reactions. The answer is chemical reactions

Explanation:

So what do you wanna know? The definition?

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below.

Answer:

Control group

Answer:

7.35 to 7.45

Explanation:

According to healthline.com, the average pH of blood is 7.35 to 7.45.

Answer:

110.91 g of CaCl2

Explanation:

11.9 grams of CaCl₂ is required to make 1 Liter of 0.1M solution.

We first need to calculate the molecular weight of calcium chloride CaCl₂.

The atomic weight of Ca = 40.01

and the atomic weight of Cl₂ = 2×35.45 = 70.90

So, the molecular weight of CaCl₂ = 40.01 + 70.90 = 110.91

This means that 110.91 g of CaCl₂ mixed with enough water will produce 1Liter of 1M solution.

Now, to calculate the amount of CaCl₂ required to make 1 Liter of 0.1M solution we use:

grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter

= 0.1 × 110.91 × 1000 ÷ 1000

= 11.09 grams

So, 11.09 grams of CaCl₂ will be used.

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Answer:

batteries

Explanation:

bc they're powered by energy

Answer:

DE

Explanation:

BC has a constant speed of 0, and DE does not have a consistent slope, therefore the speed is changing

The speed is defined as the rate of change of distance with respect to time.

In interval DE , speed of the object is changing.

Since, speed is defined as the rate of change of distance with respect to time.

   [tex]v=\frac{dx}{dt}[/tex]  , where x represent distance.

Slope of given graph represent distance, In interval BC slope is constant.

In interval, DE slope is always changing at each point.

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Answer:

[tex]Cl^-[/tex]

Explanation:

Hello.

In this case, when chlorine gets ionized by gaining one electron it goes:

[tex]Cl^-[/tex]

Whose electron configuration is the same as argon:

[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]

Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.

Best regards.

Answer:

electron geometry

Tetrahedral for N F 3

Arrangement of bonding and non-bonding electron domains

molecular geometry

Trigonal pyramidal for N F 3

Arrangement of only the atoms in a molecule

Explanation:

According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.

The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.

NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.

The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.

Electron geometry

Tetrahedral for NF₃

Arrangement of bonding and non-bonding electron domains

Molecular geometry

Trigonal pyramidal for NF₃

Arrangement of only the atoms in a molecule

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Answer:

Option A. 250 mL

Explanation:

From the question given above, the following data were obtained:

Molarity of NaCl = 3 M

Mass of NaCl = 43.83 g

Volume of water =..?

Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:

Mass of NaCl = 43.83 g

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mole of NaCl =?

Mole = mass/molar mass

Mole of NaCl = 43.83/58.5

Mole of NaCl = 0.749 mole

Next, we shall determine the volume of water required to prepare the solution as follow:

Mole of NaCl = 0.749 mole

Molarity of NaCl = 3 M

Volume of water =..?

Molarity = mole /Volume

3 = 0.749 /volume

Cross multiply

3 × volume = 0.749

Divide both side by 3

Volume = 0.749/3

Volume = 0.25 L

Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:

Recall:

1 L = 1000 mL

Therefore,

0.25 L = 0.25 L × 1000 mL / 1 L

0.25 L = 250 mL

Therefore, 0.25 L is equivalent to 250 mL.

Thus, the volume of water needed to prepare the solution is 250 mL