Can someone help me PLEASE?!!! will mark brainliest and also the rest!!!
can someone write them in their OWN words?!!! PLEASE!!! (this is for Science)
THANK YOU SOOO MUCH FOR WHO EVER HELPS ME!!! REALLY APRICIATE!
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Answer:its b

Explanation:

jusut bcss

Answer:

mixture

Explanation:

there was leftover components meaning there was something mixed into the liquid

Answer:

Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.

The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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The incorrect part of the chemical equation is the coefficient for the oxygen gas reactant.

        2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

        2 C2H10 (should be C2H6) + 10 O2 → 8 CO2 + 10 H2O

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Answer:

salt

Explanation:

the metal cation will form an ionic compound with the conjugate base of the acid to form a salt

Answer:

53.6 g

Explanation:

Step 1: Write the balanced equation

2 Zn + Pb(SO₄)₂ ⇒ 2 ZnSO₄ + Pb

Step 2: Calculate the moles of ZnSO₄ produced from 0.332 moles of Zn

The molar ratio of Zn to ZnSO₄ is 2:2. The moles of ZnSO₄ produced are 2/2 × 0.0332 mol = 0.0332 mol.

Step 3: Calculate the mass corresponding to 0.332 moles of ZnSO₄

The molar mass of ZnSO₄ is 161.44 g/mol.

0.332 mol × 161.44 g/mol = 53.6 g

Answer:

Copper

Explanation:

Because copper conducts a lot of electricity, and gets the most electrons

390 g KNO₃

Atomic Structure

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

2.3 × 10²⁴ formula units KNO₃

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of K - 39.10 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g.mol

Molar Mass of KNO₃ - 39.10 + 14.01 + 3(16.00) = 101.11 g/mol

Step 3: Convert

\(2.3 \cdot 10^{24} \ formula \ units \ KNO_3(\frac{1 \ mol \ KNO_3}{6.022 \cdot 10^{23} \ formula \ units \ KNO_3} )(\frac{101.11 \ g \ KNO_3}{1 \ mol \ KNO_3} )\) = 386.172 g KNO₃

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

386.172 g KNO₃ ≈ 390 g KNO₃

The compound that acts as the precipitate in this reaction is Pbl₂, or lead(II) iodide.

In the given reaction equation:

KI + Pb(NO3)2 → KNO3 + Pbl₂

The precipitate formed is Pbl₂, which is lead(II) iodide. In the reaction, potassium iodide (KI) reacts with lead(II) nitrate (Pb(NO3)2) to form potassium nitrate (KNO3) and lead(II) iodide (Pbl₂).

Lead(II) iodide is insoluble in water, as mentioned in the statement. When the two chemicals are mixed, lead(II) iodide is formed as a solid precipitate, which appears as a golden substance, as described.

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Detergent enzymes are better because they help limit phosphate pollutants in the environment. Option 3.

Phosphates are a common ingredient in traditional laundry detergents, but they can have harmful effects on the environment.

When phosphate-containing detergents are used, the phosphates can end up in waterways and cause excessive algae growth, leading to decreased oxygen levels in the water and harm to aquatic life.

Enzyme-based detergents can be a more environmentally friendly option as they do not contain phosphates, reducing the amount of phosphate pollution released into the environment.

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Answer:

it's a I took the test

Explanation

Answer:

A) The new substance will need more energy to form its chemical bonds than the old substance will release.

Explanation:

Answer:

an inference is an educated answer based on a piece of information you have been given

Explanation:

e.g. they had pigtails in their long blonde hair.

from this we can infer that I am speaking about a girl

Answer:

The heat and pressure can rearrange the minerals in the rocks

Sulphur  is a main-group nonmetal element in period number 3 of the periodic table.

Elements can be classified as metals, non-metals, or metalloids. Metals are excellent conductors of heat and electricity, and are malleable (can be swaged into sheets) and ductile (can be stretched into wires). Most metals are solid at room temperature and have a characteristic silvery luster (except mercury, which is liquid). Nonmetals are (usually) poor thermal and electrical conductors and are not malleable or ductile. Many of the elemental nonmetals are gases at room temperature, others are liquids, and others are solids. Semimetals are intermediate in their properties. Their physical properties are similar to non-metals, but some can be made conductive under certain circumstances. These semiconductors are very important in computers and other electronic devices.

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The reason why a separate dropper is used for each stock solution in reagent bottle is so as to prevent contamination of the reagents.

This is referred to as a short glass or plastic tube fitted with a rubber bulb which are found in reagents and is used to measure liquids by drops in the laboratory.

It is best for a separate dropper to be used for each stock solution in reagent bottle so as to prevent contamination of the reagents. This helps to ensure that the experiments which are performed are very accurate which is therefore the reason why it was chosen as the correct choice.

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The concept Charles's law is used here to determine the new temperature. The absolute scale of temperature is also developed by the scientist Charles. The new temperature is

According to Charles's law, At constant pressure, the volume of a given mass of gas is directly proportional to the temperature on Kelvin scale. Mathematically the law can be expressed as V = constant × temperature.

Here Charles's law for 2 gases is:

V₁ / T₁ = V₂ / T₂

T₂ = V₂T₁ / V₁

15 × 27 / 2.8 = 144 .6 C

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Answer:

full moon

Explanation:

....ur welcome..............

Answer:

full moon

Explanation:

Answer:

C: matter is made of parts that very small

The ideas utilized in this issue are the frequency of simple harmonic motion, Hooke's law, and Newton's second law of motion. First, apply Hooke's law and Newton's second law of motion to determine the spring constant. Utilizing the frequency in terms of the spring constant, determine the frequency.

Newton's second law of motion

Newton's second law of motion states that "the net force acting on an object is equal to the product of that object's mass and its rate of acceleration."

The expression of net force is: -

F = ma

Here,

m = mass

a = acceleration

Hooke’s Law

"The force required to compress or extend the spring is precisely proportionate to the displacement distance," according to Hooke's law.

The magnitude of spring force is: -

F = kx

Where,

k = spring constant

x = displacement

Frequency of SHM: -

The simple harmonic motion is a periodic motion whose expression for frequency is:

f = 1/2π (k / m)0.5

STEP 1. The spring exerts a force on a driver:

f = kx

f = k (0.005m)                                 -------------- (i)

According to Newton’s Law:

F = ma

F = mg

F = 68 * 9.8

F = 666.4N                                       --------------- (ii)

From (i) and (ii)

k (0.005) = 666.4

k = 133280 N/m

The car is suspended vertically from the spring in this instance, as explained. Gravitational acceleration is hence the acceleration that causes the motion.

N/m is the spring constant's SI unit.

STEP 2. The expression for frequency is:

f = 1/2π (k / m)0.5       ----------------- (iii)

Here,

m = total mass (1500+68 = 1568Kg)

k = 133280 N/m

Putting these values in eq. (iii)

f = 1.467 Hz = 1.5 Hz

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Answer:

5

35 divided by 7 = 5

Explanation:

Hope this helps!!

Liyah

For this section:

(d) To determine which acid would be completely dissociated when dissolved in water, consider the strength of the acid and its ability to ionize completely. Strong acids are those that ionize completely in water, while weak acids only partially dissociate.

Among the given options:

(H O)₂SO is sulfuric acid (H₂SO₄), which is a strong acid and completely dissociates in water.

(H O)IO₃ is iodic acid (HIO₃), which is also a strong acid and completely dissociates in water.

(H O)₂SO₂ is not a known acid and cannot be evaluated for dissociation.

HCO₂H is formic acid (HCOOH), which is a weak acid and only partially dissociates in water.

Therefore, the acids that would be completely dissociated when dissolved in water are (H O)₂SO and (H O)IO₃.

(e) To estimate the pH of the given solutions formed by titration, compare the moles of the acid and base used in the reaction.

(i) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous HCl, the reaction between a strong acid (HCl) and a strong base (NaOH) forms a neutral salt (NaCl) and water. The resulting solution would have a pH of 7, indicating neutrality.

(ii) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous acetic acid, consider the ionization of acetic acid and the formation of its conjugate base. The pKa of acetic acid is given as 4.76.

Since the volumes and concentrations of the acid and base are equal, we have a 1:1 mole ratio between them. This means that half of the acetic acid will be neutralized, and the remaining half will be in the form of the conjugate base (acetate ion, CH₃COO-). The resulting solution will be a buffer solution with a pH close to the pKa of acetic acid, which is 4.76.

(f) To predict the products formed from mixing the given reagents, we need to consider the reactions and the possible chemical reactions that occur.

(i) 3I₂ + PBr₃: This reaction involves the combination of iodine (I₂) with phosphorus tribromide (PBr₃). The balanced equation is:

3I₂ + 2PBr₃ → 6IBr + P₂

(ii) 4LiH + GaCl₃: This reaction involves the combination of lithium hydride (LiH) with gallium trichloride (GaCl₃). The balanced equation is:

4LiH + GaCl₃ → 4LiCl + GaH₃

(iii) NH₃ + BCl₃: This reaction involves the combination of ammonia (NH₃) with boron trichloride (BCl₃). The balanced equation is:

NH₃ + BCl₃ → NH₃BCl₃

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Answer:

1 mole of Fe is 55.85 g per mole

Explanation:

hope it helps

The moles of hydrogen that are needed to make 30 moles of Fe is 45 moles.

Moles is a measurement unit. It is the quantity amount of substance.

The balanced equation is

Fe2O3 + 3H2 ---> 2Fe + 3H2O

Given the moles of iron is 30

To find the moles of hydrogen is?

According to the given balanced equation, the ratio of moles of hydrogen and iron is 3 : 2

To produce 30 moles of Fe

30 x 3 / 2 = 45 moles.

Thus, the number of moles of hydrogen is 45 moles.

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Your question is incomplete. Your most probably complete question is given below:

One way to change iron are, Fe2O3, into metallic iron is to heat it together with hydrogen:

Fe2O3 + 3H2 ---> 2Fe + 3H2O

Answer:

One way to synthesize alkenes is by dehydration of alcohols, a process in which alcohols undergo E1 or E2 mechanisms to lose water and form a double bond. The dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as sulfuric or phosphoric acid, at high tempera (sorry if this is wrong )

Answer

HCl+NaOH=NaCl+H2O (NaCl+H20)=the product

is a double substitution reaction

so the product ,one of them will be or Nacl or Water(H2O)

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas.

The combined gas law is expressed as:

(P1V1)/T1 = (P2V2)/T2

where P1 and T1 are the initial pressure and temperature, respectively, and P2 and T2 are the final pressure and temperature, respectively. V1 and V2 represent the volume of the gas, which is assumed to be constant in this problem.

We can rearrange the equation to solve for P2:

P2 = (P1 x T2) / T1

Plugging in the given values:

P1 = 0.29 atm

T1 = -94 °C = 179 K (converted to Kelvin by adding 273.15)

T2 = 177 °C = 450 K

V1 = V2 (assumed to be constant)

P2 = (0.29 atm x 450 K) / 179 K

P2 = 0.72 atm (rounded to two significant figures)

Therefore, the pressure will be approximately 0.72 atm when the temperature is increased to 177 °C.

The amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To calculate the amount of copper in moles in a pure copper sheet, we need to use the molar mass of copper and the given mass of the sheet.

The molar mass of copper (Cu) is approximately 63.55 g/mol. This value represents the mass of one mole of copper atoms.

Given that the mass of the pure copper sheet is 27.5 g, we can calculate the number of moles using the following formula:

moles = mass / molar mass

Substituting the values:

moles = 27.5 g / 63.55 g/mol

moles ≈ 0.433 mol

Therefore, the amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To arrive at this result, we divided the given mass of the sheet (27.5 g) by the molar mass of copper (63.55 g/mol). This calculation allows us to convert the mass of the sheet into the corresponding number of moles of copper.

The result tells us that the 27.5 g pure copper sheet contains approximately 0.433 moles of copper atoms. This conversion to moles is useful in various chemical calculations and allows for easier comparison and analysis of quantities on a molecular scale.

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Answer:

32 K is approx. -241.15° C