HELPPP PLZZ I need help

12 answers
Question:

HELPPP PLZZ I need help

[tex]HELPPP PLZZ I need help[/tex]


Answers

x=2

Step-by-step explanation:

5x-1=3x+3

2x-1=3

2x=4

x=2

x = 2

Step-by-step explanation:

We can say that both the triangles are congruent by the "if two angles of given triangles are congruent then the triangles are congruent" theorem, so we can set both equations equal to each other:

5x - 1 = 3(x + 1)

=> 5x - 1 = 3x + 3

=> 2x - 1 = 3

=> 2x = 4

=> x = 4/2

=> x = 2

Hope this helps!

225=300x
225=300t
This is the answer, I think.

1 Precipitation

2 Groundwater

3 True

1: precipitation

2:I think ground water

3:true

27) Partial pressure of oxygen: 57.8 kPa

29) Final volume: 80 mL

30) Final volume: 8987 L

31) Due to property of water of being polar, ice floats on water

Explanation:

27)

In a mixture of gases, the total pressure of the mixture is the sum of the partial pressures:

[tex]p_T = p_1 + p_2 + ... + p_N[/tex]

In this problem, the mixture contains 3 gases (helium, carbon dioxide and oxygen). We know that the total pressure is

[tex]p_T=201.4 kPa[/tex]

We also know the partial pressures of helium and carbon dioxide:

[tex]P_{He}=125.4 kPa\\P_{CO_2}=18.2 kPa[/tex]

The total pressure can be written as

[tex]p_T=p_{He}+p_{CO_2}+p_{O_2}[/tex]

where [tex]p_{O_2}[/tex] is the partial pressure of oxygen. Therefore, we find

[tex]p_{O_2}=p_T-p_{He}-p_{CO_2}=201.4-125.4-18.2=57.8 kPa[/tex]

29)

Assuming that the pressure of the gas is constant, we can apply Charle's law, which states that:

"For an ideal gas at constant pressure, the volume of the gas is proportional to its absolute temperature"

Mathematically,

[tex]\frac{V}{T}=const.[/tex]

where

V is the volume of the gas

T is the Kelvin temperature

We can re-write it as

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

Here we have:

[tex]V_1 = 42 mL[/tex] (initial volume)

[tex]T_1=-89^{\circ}C+273=184 K[/tex] is the initial temperature

[tex]T_2=77^{\circ}C+273=350 K[/tex] is the final temperature

Solving for V2, we find the final volume:

[tex]V_2=\frac{V_1 T_2}{T_1}=\frac{(42)(350)}{184}=80 mL[/tex]

30)

For this problem, we can use the equation of state for ideal gases, which can be written as

[tex]\frac{p_1 V_1}{T_1}=\frac{p_2 V_2}{T_2}[/tex]

where in this problem:

[tex]p_1 = 102.3 kPa[/tex] is the initial pressure

[tex]V_1=1975 L[/tex] is the initial volume

[tex]T_1=25^{\circ}C+273=298 K[/tex] is the initial temperature

[tex]p_2=21.5 kPa[/tex] is the final pressure

[tex]T_2=12^{\circ}C+273=285 K[/tex] is the final temperature

And solving for V2, we find the final volume of the balloon:

[tex]V_2=\frac{p_1 V_1 T_2}{p_2 T_1}=\frac{(102.3)(1975)(285)}{(21.5)(298)}=8987 L[/tex]

31)

A molecule of water consists of two atoms hydrogen bond with an atom of oxygen ([tex]H_2 O[/tex]) in a covalent bond.

While the molecul of water is overall neutral, due to the higher electronegativity of the oxygen atom, electrons are slightly shifted towards the oxygen atom; as a result, there is a slightly positive charge on the hydrogen side, and a slightly negative charge on the oxygen side (so, the molecules is said to be polar).

As a consequence, molecules of water attract each other, forming the so-called "hydrogen bonds".

One direct consequence of the polarity of water is that ice floats on liquid water.

Normally, for every substance on Earth, the solid state is more dense than the liquid state. However, this is not true for water, because ice is less dense than liquid water.

This is due to the polarity of water. In fact, when the temperature of water is decreased to freezing point and water becomes ice, the hydrogen bondings "force" the molecules to arrange in a lattice structure, so that the molecules become more spaced when they turn into solid state. As a result, ice occupies more volume than water, and therefore it is less dense, being able to float on water.

Learn more about ideal gases:

#LearnwithBrainly

4

Step-by-step explanation:

2*4=8

8/2=4

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D=m/v

Step by Step Explanation

Density = mass divided by volume

I can't understand pls tell briefly

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

[tex]Agroup of 80 students was asked to share how they get to school most of the time. the following circ[/tex]

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

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