Count the following atoms​
NEED ANSWER ASAP ​

Answer:

Nitrogen has 7 protons and 7 electrons and 7 neutrons.

Explanation:

The atomic number of an element is the number of electrons and protons they have. The atomic mass - the atomic number of an element equals the number of nuetrons. The atomic mass of nitrogen is 14 and the atomic number is 7 therefore we have to subract, 14-7=7.

strong salt solution

normal salt wouldnt work becaue unlinke slugs they have a waterproof skin

Answer:  123×10−7m.

Explanation:

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Here's the procedure to Crack an egg ~

Step 1 ~

Step 2 ~

Step 3 ~

Answer:

You can block me I don't care ;-; Ive actually been wanting to be blocked because I don't want my account on brainly anymore but they cant understand that I used my school email for this account and my school email doesnt reseave emails not from the school and I cant change the email to a different one so I cant reset my password so I cant delete my account..

Explanation:

Methane is found under the ground or under marine sediments  as natural gas which is mined along with crude oil.

Methane is an alkane and has the formula CH4. It is most commonly used as fuel. Methane is the gas that has been renowned as being responsible for explosion in coal mines.

Methane is found under the ground as natural gas which is mined along with crude oil. Large deposit of natural gas is found in many countries in Asia, Africa and the middle east.

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This problem is describing the combustion experiment where by the heat of combustion of 1.66 g of liquid C6H14 can be calculated via calorimetry. The calorimeter (C=11.2kJ/°C) contains 2750. grams of water with a temperature rise of 3.54 °C, it means we can calculate the total heat released by the combustion of this hydrocarbon via:

[tex]Q_{combustion}=-(Q_{calorimeter}+Q_{water})[/tex]

Because the heat of combustion is released to the water and the calorimeter. Next, we break down each heat and subsequently plug in the given values:

[tex]Q_{combustion}=-(11200\frac{J}{\°C}*3.54\°C +2750.g*4.184\frac{J}{g\°C}*3.54\°C )\\\\Q_{combustion}=-80,379J=-80.4kJ[/tex]

After that, we calculate the moles of C6H14 by considering the given mass and its molar mass (86.18 g/mol):

[tex]n=1.66g*\frac{1mol}{86.18g} =0.01926mol[/tex]

And finally, we divide the total heat of combistion by the moles to get the heat of combustion:

[tex]\Delta H_{comb}=\frac{-80.4kJ}{0.01926mol} =4,174\frac{kJ}{mol}[/tex]

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The physical adaptation among the option that increases an organisms

chances of finding a suitable habitat is the long legs of wading birds

An adaptation is a characteristic that helps an animal survive in its habitat.

Any animal who successfully survives on land or water must have behavioural

and physical trait or attributes or adaptation that assist it to achieve those

goals.

This physical adaptation might be body growth, body covering during

weather change, body functioning or even body parts.

The physical adaptation among the option that increases an organisms

chances of finding a suitable habitat is the long legs of wading birds.

The long legs of wading birds assist them to find a suitable habitat. The long

legs can move through shallow water without wetting their feathers.

There long leg give them better eye sight to search for food and suitable

habitats.

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Answer:

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.

Answer:

first

Explanation:

0. 10 mol L-1 HF and 0. 10 mol L-1 CH3COONa a solution that is 0 is a good buffer system. so, option A is correct.

When acids or bases are introduced, a buffer system is a solution that resists changing in pH. Acidic solutions have pH values under seven and significant hydrogen ion ( H+ ) concentrations. Basic solutions have pH values higher than seven and high quantities of hydroxide ions ( OH- ).

The carbonate, carbonic acid buffer, the phosphate buffer, and the buffering of plasma proteins make up the body's chemical buffer system.

Plasma proteins, phosphate, bicarbonate, and carbonic acid buffers are among the buffer systems active in blood plasma. By excreting hydrogen ions and producing bicarbonate, which helps keep blood plasma pH within a normal range, the kidneys contribute to the regulation of acid-base balance.

Thus, option A is correct.

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Answer:

A positive ion

Explanation:

when an atom losses an ion it become positive while when an atom gains an atom it becomes negative

Answer:

C. They deliver pollen from the stamens of plants to the ovaries of other plants

Explanation:

hope this helps :)

Answer:

nucleus

Explanation:

The nucleus contains the majority of an atom's mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom's volume

Answer:

V1/n1 = V2 /n2

0.236/0.306 = V2/ 4.40

V2 = 3.39 L

Answer:

B. hydrochloric acid and lithium hydroxide

Explanation:

Answer:

thank you!

the answer is B) hydrochloric acid and lithium hydroxide.

Explanation:

have a rest of your day.

Answer: condensation, exothermic reaction, freezing

Explanation: Edge

The heating curve could describe processes such as boiling, condensation and freezing.

A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperature.

Which processes could the heating curve be describing?

The heating curve could describe processes such as boiling, condensation and freezing.

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1. The formula of the precipitate formed is Ba₂SO₄(s)

2. The molarity of the Ba(NO₃)₂ solution is 0.188 M

1. Determination of the formula of the precipitate formed.

Na₂SO₄(aq) + Ba(NO₃)₂(aq) —>

2Na⁺(aq) + SO₄²¯(aq) + Ba²⁺(aq) + 2NO₃¯(aq) —> Ba₂SO₄(s) + 2Na⁺(aq) + 2NO₃¯(aq)

Cancel the spectator ions (i.e Na⁺ and NO₃¯) to obtain the net ionic equation

SO₄²¯(aq) + Ba²⁺(aq) —> Ba₂SO₄(s)

Therefore, the formula of the precipitate formed is Ba₂SO₄(s)

2. Determination of the molarity of Ba(NO₃)₂

Molar mass of Ba₂SO₄ = (2×137) + 32 + (4×16) = 370 g/mol

Mass of Ba₂SO₄ = 3.046 g

Mole = mass /molar mass

Mole of Ba₂SO₄ = 3.046 / 370

Na₂SO₄(aq) + Ba(NO₃)₂(aq) —> Ba₂SO₄(s) + 2NaNO₃(aq)

From the balanced equation above,

1 mole of Ba(NO₃)₂ reacted to produce 1 mole Ba₂SO₄.

Therefore,

0.008 mole of Ba(NO₃)₂ will also react to produce 0.008 mole of Ba₂SO₄

Thus, 0.008 mole of Ba(NO₃)₂ is required for the reaction.

Mole of Ba(NO₃)₂ = 0.008 mole

Volume = 42.53 mL = 42.53 / 1000 = 0.04253 L

Molarity = mole / Volume

Molarity of Ba(NO₃)₂ = 0.008 / 0.04253

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Answer:

A

Explanation:

collision theory is a theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another

Answer: it definitely did help me a lot but sometimes it doesn’t make me happy like i will get stressed but it passes.

Explanation:

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The balanced chemical equation for given reaction is ~

There are quite a few ways to add moisture into the air without a humidifier

A few things that can help add moisture are hanging your clothing to dry. hang drying your damp clothes will add moisture to the air over time as it evaporates and it will make your house smell like fresh clothes.

Another thing is a bath,  allow the water to cool off and leave the bathroom door open, the steam will add moisture to the air as the water cools.

This might seem silly but putting bowls or vases of water out on the windowsill on a sunny day mill moistens the air as it evaporates.

You can also get houseplants, moisture evaporates from the leaves and stems of plants. transpiration can help increase the humidity in your home.

not sure if this is the answer you were looking for but if so im glad i could help. have a great day!

Answer:

the answer is c or a am I right☺

Answer:

Molarity NaOH = 0.85M (2 sig figs)

Explanation:

48.0ml(0.220M H₂SO₄) + 25ml(Xmolar NaOH)H₂SO₄ + 2NaOH => Na₂SO₄ + 2H₂O

2(molarity x volume) H₂SO₄ = (molarity x volume) NaOH

2(0.220M x 48.0ml) = 25.0ml x Molarity NaOH

Molarity NaOH = 2(0.220M x 48.0ml)/25.0ml = 0.8448M ≅ 0.85M (2 sig figs)

Answer:

38.9%

Explanation:

below, determine the mass percent of Fe3+ in a 0.6450 g sample of iron ore, if 22.40 mL of a 0.1000 M stannous chloride, SnCl2(aq), solution is required to completely react with the Fe3+ present in the ore sample. The chemical equation for the reaction is

2 Fe3+ (aq) + Sn2+ (aq) →2Fe2+ (aq) + Snº+(aq).

O 19.40%

O 6.196%

O 38.79%

O 9.697%

 2 Fe3+ (aq) + Sn2+ (aq) →2Fe2+ (aq) + Snº+(aq).ole of Sn2+

for every mole of Sn2+, tere are 2 moles of Fe3+

so there are 0.00224 X 2= 0.00448 moles Fe3+

iron atomic mass is 56

56 X 0.00448 = 0.251 gm Fe3+

so the mass % of the Fe3+ in the 0.645 gm iron ore sample is

(0.251/0.645) X 100 = 38.9%

Baking soda is a salt of sodium and bicarbonate ions. In a soda test, the breath will raise the temperature as it contains water vapor and decomposes the soda.

The baking soda is also called sodium bicarbonate, and the test uses sodium bicarbonate as a reactant. It is also a leavening agent that is used in the preparation of food.

Breath contains some amount of water vapor that alters the test by diluting it and resulting in the clouding of the test. The water vapor decomposes the baking soda and alters the test results.

Therefore, breath contains water vapor.

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Answer:

Chlorophyll makes plants green.

Enzymes are responsible for dictating what chemical changes happen and when, so thus they control the life process of the cells in our bodies.

The cell wall is what gives a plant cell it's distinct shape (animal cells don't have cell walls btw).

Intracellular fluid, or cytosol, is the fluids stored in the Intracellular compartment.

The cell membrane is the barrier between everything inside the cell, and everything else outside of it. It protects the contents of the cell from harm and releases toxins and other waste from it. The cell membrane is basically like the gate keeper of the cell.

Explanation:

Hope this helps, I tried :)