find the molarity of 4.9 g of h2so4 in 400 ml solution

Explanation:

Evolution is a biological process. It is how living things change over time and how new species develop.

Answer: It’s B

Explanation:

From the Dalton's law of partial pressures, the pressure of the hydrogen gas is 91.83 kPa.

In a mixture of gases, the total pressure is the sum of the pressures of the individual gases in the mixture according to the Dalton's law of partial pressures.

In this case, the partial pressure of the hydrogen gas is Phydrogen, the partial pressure of water is Pwater and the total pressure is PT.

Hence;

Phydrogen = PT - Pwater

95 - 3.17 = 91.83 kPa

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Answer:

the first question's answer is 10.7g and the follow up question is 47.7g.

Explanation:

it makes you drag the object onto the scale and then displays it on the green rectangle.

Answer:

A certain portion of the land will be set aside as wildlife habitat

Answer:

frequency

Explanation:

because a wave is equally a frequency

Answer: The butterfly effect

Explanation:

Answer:

acceleration

learnt this in 8th grade

acceleration

Newton's second law : F = m.a

F proportional to m and a

F > than a >

Answer:

esterification reaction ...........

The type of reaction that occurs between  calcium hydroxide and nitric acid is a neutralization reaction.

The term neutralization reaction refers to a reaction that occurs between an acid and a base that leas to the formation of salt and water only. The type of reaction that occurs between  calcium hydroxide and nitric acid is a neutralization reaction.

The reason why zinc will react with lead nitrate and not calcium chloride is because lead is less than zinc in the electrochemical series hence it can be displaced from solution.

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Answer:

2.2 moles H2O

Explanation:

[tex]35g O_2 \mbox{ \cdot }\frac{1mol}{32g/mol} \mbox{ \cdot }\frac{2mol H_2O}{1mol O_2}= 2.1875[/tex], which rounds to about 2.2

Answer:

chemical reaction

Explanation:

Reduction is the transfer of electrons between species in a chemical reaction where there is a process of gaining electrons or a decrease in the oxidation state by an element. A reduction chemical reaction involves increasing electrons associated with a single atom or a group of atom

Answer:

I didn't draw this but I think they're asking you to draw this

Explanation:

One mole Hydrogen need 1/2mol O_2 .

Moles of Hydrogen

Moles of O_2

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Let's get to the reaction first ~

[tex] \qquad \qquad \rm 2H_2 + O_2 \rightarrow 2H_2O[/tex]

Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.

So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.

Number of Hydrogen gas molecules is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{30}{2} [/tex]

[tex]\qquad \sf  \dashrightarrow \: 15[/tex]

Number of Oxygen gas molecules needed is :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{15}{2} [/tex]

Number of Oxygen atoms needed :

[tex]\qquad \sf  \dashrightarrow \: \dfrac{15}{2} \times 2[/tex]

[tex]\qquad \sf  \dashrightarrow \: {15} \: atoms[/tex]

One atom of Oxygen weight 16 u, so 15 atoms weight ~

[tex]\qquad \sf  \dashrightarrow \: {15} \times 16[/tex]

[tex]\qquad \sf  \dashrightarrow \: 240 \: u[/tex]

So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.

Answer:

.0987 moles

Explanation:

Ideal gas law     PV = n RT       R = .082057 L-atm/mol-K

7 ( .347) = n (.082057) (300)       n = .0987 moles

[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]

[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]

[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]

[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]

[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]

A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.

Balanced chemical equation:

[tex]2 HCl + Mg(OH)_2[/tex] → [tex]2 H_2O + MgCl_2[/tex]

[tex]3 Ca(ClO)_2[/tex] → [tex]2 CaCl_2[/tex] + [tex]Ca(ClO_3)_2[/tex]

[tex]2 KBr + Ca(NO_3)_2[/tex] →[tex]2 KNO_3 + CaBr_2[/tex]

[tex]2Al +6HCl[/tex] → [tex]2AlCl_3 +3H_2[/tex]

[tex]2C_2H_6+7O_2[/tex] → [tex]4CO_2+6H_2O.[/tex]

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David runs a 100-m dash while pushing a stroller with a force of 25N.  The work done by David is 2500 Nm.

Force is a power that changes the motion of the object.

The displacement is 100 m

The force is 25 N

Work done = force x displacement

25 x 100 = 2500 Nm

Thus, the work done by David is 2500 Nm.

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Answer:

95F

Explanation:

First we convert these temperatures into °C:

77°F = 25°C

95°F = 35°C

280K = 6.85°C

300K = 26.85°C

When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.

Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.

HCl(acid)+C₄H₈ (butene)⇒ addition reaction

name of the product: 2-cloro butane

A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.

So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

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Answer:

The calculated volume of the gas (in mL) at 20.0c and 740.mmHg when volume of gas collected at temperature of  11.0° C and pressure of 710 mmHg measures 0.148L is 78. 1 mL

Explanation:

The combined gas law combines the three gas laws, Boyle's law, Charles's law and Gay- Lussac's law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.

P V ÷ T = K

P1 × V1 ÷ T1 = P2× V2 ÷ T2

Parameters :

P1 = Initial pressure = 710.0 mmHg

V1 = 0. 148 L , converting it to mL = 0.148L × 1000 = 148 mL

T1 = Initial temperature = 11° C

P2 = Final pressure = 740 mmHg

V2 = Final volume in mL

T2 = Final temperature = 20° C

Calculations:

V2 = P1 × V1 × T2 ÷ P2 × T1

V2 = 710 × 148 × 11 ÷ 740 × 20

V2 = 1155880 ÷ 14800

V2 = 78.1 mL

Therefore, the calculated volume is 78.1 mL

Answer: Tree and Grass are the two correct answers here

Explanation:  Producers are photosynthesizing organisms. They are any kind of green plant that make their food by taking sunlight and using the energy to make sugar.

Answer:

Tree, grass

Explanation:

Producers make their own food. Trees and grass can make their own food using sunlight (photosynthesis). Monkey is consumer (eats other things like bananas- made by plants - for survival). Mold (like fungus) eat dead stuff and thus are decomposers (not producers).

Answer:

C

Explanation:

Increasing temp causes increased molecule movment in sample 2

[tex]2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO}[/tex]

According to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.

They are the different sets of organs that make up the body, collaborating in each case with the fulfillment of some specific type of functions.

This simultaneous and juxtaposed set of systems involves various organs, ducts, tissues and various glands, all coordinated by endocrine substances and nerve impulses, so as to operate more or less autonomously as the case may be.

Therefore, we can conclude that according to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.

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Answer:

pH = 6.91

Explanation:

Recall that at 25 °C, we have the relationship:

[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]

Therefore, the pH of a solution with a pOH of 7.09 is:

[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]

The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).

In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.

Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.

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The error in the student's reasoning happened as they get confused between the beta minus decay and beta plus decay.

A neutron is converted into a proton in beta minus, increasing the atomic number of the atom.

In the given question beta minus decay is not occur as atomic number of the daughter nuclei does not increases. Rather than this in the given decay atomic mass of the daughter nuclei is less than the parent nuclei means plus beta decay is happened there.

Hence the error is in predicting the correct particle with charge.

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