Please help This is for my chemistry class and I need to get it done but I’m lost and need answers

Answer:

https://brainly.com/question/19533453

Explanation:

This might be able to help you.

Answer:

459.11 g.

Explanation:

hope this helps

Answer:

1.Phenolphthalein

2.Method

a.Use the pipette and pipette filler to add 25 cm 3 of alkali to a clean conical flask.

b.Add a few drops of indicator and put the conical flask on a white tile.

c.Fill the burette with acid and note the starting volume.

d.Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.

Explanation:

Answer:

The forms of energy are:

These are the six forms hope you can write short notes on them.

Answer:

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

The volume of the dry nitrogen gas at STP is 57.4 mL

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

Initial volume (V₁) = 77 mL

Initial temperature (T₁) = 50 °C = 50 + 273 = 323 K

Initial pressure (P₁) = 763 – 92.5 = 670.5 mmHg

Final temperature (T₂) = STP = 273 K

Final pressure (P₂) = 760 mmHg

The volume of the dry nitrogen can be obtained by using the combine gas equation as follow:

[tex] \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\ \\ \frac{670.5 \times 77}{323} = \frac{760 \times V_2}{273} \\ \\ cross \: multiply \\ \\ 323 \times 760 \times V_2 = 670.5 \times 77 \times 273 \\ \\ divide \: both \: side \: by \: 323 \times 760 \\ \\ V_2 = \: \frac{670.5 \times 77 \times 273 }{323 \times 760} \\ \\ V_2 = 57.4 \: ml[/tex]

Therefore, the volume of the dry nitrogen gas is 57.4 mL

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Answer:

plutonic rocks are formed when magma cools and solidifies underground This shows us if the rock is plutonic or volcanic. When magma cools underground, it cools super slow and when lava cools above ground, it cools faster. When magma and lava cool, mineral crystals start to form in the molten rock.

Explanation:

i hope this is correct

Answer:

and id say maybe

Explanation:

Light waves travel much faster than sound waves.

mix the food with digestive juices that have acids and enzymes, breaking it into much smaller, digestible pieces

Answer:

The mass number of an atom, which is also called the atomic mass number,  is the total number of protons and neutrons in an atom,

Explanation:

Hope this is helpful.

The pressure of this gas in atm is equal to 1.63 atm.

Given the following data:

To calculate the pressure of this gas, we would use the ideal gas law equation;

[tex]P=\frac{nRT}{V}[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]P=\frac{0.742 \times 0.0821 \times 291}{10.91} \\\\P = \frac{17.73}{10.91}[/tex]

Pressure, P = 1.63 atm.

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Answer: The reaction of 1 mol of C to form carbon monoxide in the reaction 2 C(s) + O2(g) ( 2 CO(g) releases 113 kJ of heat. How much heat will be released by the combustion of 100 g of C according the the above information? According to the balanced chemical equation;

Explanation:

4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.

Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:

[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)

Where:

If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:

[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]

[tex]Q = 4709.25\,J[/tex]

4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.

We kindly invite to check this question on sensible heat: https://brainly.com/question/11325154

Answer: 7

Explanation:

Answer:

6680 J

Explanation:

Answer:

source Mass extinctions are episodes in which a large number of plant and animal species become extinct within a relatively short period of geologic time—from possibly a few thousand to a few million years. ... Permian Period — 252 million years ago. Devonian Period — 359 million years ago. Ordovician Period — 443 million years

BP: Nowadays, scientists are aware of five mass extinction events in the past, starting with the End-Ordovician Extinction 450 million years ago and up to the End-Cretaceous Extinction that killed off the dinosaurs 66 million years ago

In your own words- Mass extinctions area unit episodes during which an oversized variety of plant and animal species become extinct at intervals a comparatively short amount of earth science time—from probably some thousand to some million years. ... Permian period — 252 million years past. period — 359 million years past. geological period — 443 million years

BP: today, scientists area unit alert to 5 mass extinction events within the past, beginning with the End-Ordovician Extinction 450 million years past and up to the End-Cretaceous Extinction that killed off the dinosaurs sixty six million years past

Explanation:

source is where i got this information and the in your own words is it fully rewritten hope this helps and my aplogies for making this so lengthy!

The quantity of the product that was formed was 5g

From the question,

We are to determine the quantity of product formed. That is, the actual yield.

Using the formula

[tex]Percentage \ yield =\frac{Actual \ yield}{Theoretical\ yield} \times 100\%[/tex]

From the given information

Theoretical yield = 10g

Percentage yield = 50%

Putting the parameters into the formula, we get

[tex]50\% = \frac{Actual\ yield}{10} \times 100\%[/tex]

Then,

[tex]50\% = Actual\ yield \times 10\%[/tex]

∴ Actual yield = [tex]\frac{50\%}{10\%}[/tex]

Actual yield = 5g

Hence, the quantity of the product that was formed was 5g

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Answer:

5.57 x 10^24 atoms

Explanation:

first, you are seeking the number of ATOMS of Boron.

Boron has an Atomic mass of 10.8 g/mol (see #5 on the periodic table)

100 gm of Boron would have 100 g /10.8 g/mol =9.26 moles

each mole has Avogadros number of atoms 6.02 x 10^23

9.26 moles has 9.26 x 6.02 x 10^23 atoms =5.57 x 10^24 atoms

Answer:

Transpiration is the correct answer mark me brainliest

Answer:

Conversion of energy

Explanation:

Shaking the sand is a form of kinetic energy. The friction of the sand particles rubbing against each other converts the kinetic energy to heat energy. Some of the kinetic energy also converts into the energy of sound waves, which you can hear while you shake the sand.

C

R. F. M (Relative Formula Mass) of C=12

12g of C=1 mole

1.39g of C=(1*1.39)/12

=0.1158 moles

Answer:

0.57 molecules

Explanation:

Answer:

Temperature

Explanation:

This is because quantitative data include numerical values for example 10 degrees Celsius. However the others are qualitative data because the research can be described but not with numbers like your appearance is very nice.

Hope this helps :P

Answer:

Quantitative data is the type of data whose value is measured in the form of numbers or counts, with a unique numerical value associated with each data set. Also known as numerical data, quantitative data further describes numeric variables (e.g. How many? How often? How much?)

Explanation:

so its temp

Answer:

yes/no

Explanation:

I prefere it refrigerated because it lasts longer in my opinion. but some people keep it out

Answer:

yes.

Explanation:

It does unless you want warm soggy pie.

Answer:

The most populous state in the United States is California, which has 37,253,956 inhabitants. On the other hand, the least populated state is Wyoming with 493,782 inhabitants.

Answer: Alaska. Alaska is by far the least densely populated of the US states and has 1.3 persons per square mile.

Explanation:

Hope it helped .

Answer:

because of chemical reactions

Answer:

gases expand rapidly because their particles move at high speeds in all directions