I really need an answer please help

Answer: Oxygen

Explanation:

Producer organisms include plants and algae and refer to organisms that are able to produce their own food by synthesizing it from inorganic matter. This is what plants and algae are able to do through the process of photosynthesis.

During photosynthesis, these organisms produce food for themselves and in doing so produce oxygen as a by-product. This is what contributes mostly to the concentration of oxygen in the atmosphere.

Answer:

19.99

Explanation:

The steps are what I did, so no need to do it the exact same!

1. Add 4.50 and 3.4

4.50 + 3.4 = 7.9

2. Add 7.9 and 12.09

7.9 + 12.09 = 19.99

Hope this helps!

Answer:

The answer to this equation is 19.99. If you round the number, it is 20.

Explanation:

     4.50

     3.40 (0 as a place holder)

+   12.09

-------------------

     19.99 because . . .

4.5 + 3.4 = 7.9

7.9 + 12.09 = 19.99.

19.99 ≅ 20.00 or 20 (IF YOU NEED TO ROUND IT, IF NOT, IT IS JUST 19.99!!!)

Answer:

1.05 x 10²²atoms

Explanation:

Given parameters:

Mass of  Pb  = 3.6g

Unknown:

Number of atoms in Pb = ?

Solution:

Some very essential constants;

       1 mole of a substance contains 6.02 x 10²³atoms/mole

  Molar mass of Pb  = 207.2g/mol

First, we convert the mass to number of moles then to number of atoms.

   Number of moles  = [tex]\frac{mass(g)}{number of moles(g/mol)}[/tex]  

        3.6g x [tex]\frac{1}{207.2}[/tex]  x [tex]\frac{g}{g/mol}[/tex] x 6.02 x 10²³  x [tex]\frac{atoms}{mole}[/tex]   = 1.05 x 10²²atoms

Answer:

1. Digestive system.

2. Respiratory system

3. Nervous system

4. Immune system

Explanation:

When you go to the doctor for an illness, the doctor asks you how you feel. You describe all your symptoms. Then, the doctor makes hypotheses about which organ system is having problems.

1. Digestive system: stomach ache, gassy, no appetite.

2. Respiratory system: sneezing all the time, runny nose, trouble breathing, coughing.

3. Nervous system: having a very hard time remembering people's names, feeling sad and anxious.

4. Immune system: seem to be catching every disease that comes around, taking a long time to get a better

Answer:

2-Butanone

Explanation:

From the given information:

The presence of mercury as an acid catalyst brings about the addition of water to the triple bond which yields enol. Then, according to Markownikov's rule and after tautomerism has occurred, we have a methyl ketone ( 2- Butanone) as the product.

The answer regarding the transformation is addition and hydration.

Answer:

See explanation

Explanation:

Looking at the structure of the starting material, we can see that the carbocation intermediate is a tertiary carbocation.

The tertary carbocation is very stable.  Indeed, it is the most stable carbocation intermediate. As such, none of this other product is obtained due to this intermediate.

The mechanism of this reaction is shown in the image attached to this answer.

Answer:

Option D: Cations

Explanation:

Do you need only one answer .

Answer:

consumption, investment, government consumption, and gross investment, and net exports.

Explanation:

Answer:

Show diagram so we can see

Explanation:

Answer:

Mass = 14.0 g

Explanation:

Given data:

Mass of mercury nitrate = 22.17 g

Mass of mercury formed = ?

Solution:

Chemical equation:

Hg(NO₃)₂ + 2K    →    2KNO₃ + Hg

Number of moles of mercury nitrate:

Number of moles = mass/molar mass

Number of moles = 22.17 g / 324.6 g/mol

Number of moles = 0.07 mol

Now we will compare the moles of Hg(NO₃)₂ and mercury.

                Hg(NO₃)₂       :        Hg

                     1                :          1

                  0.07             :       0.07

Mass of mercury:

Mass = number of moles × molar mass

Mass = 0.07 mol × 200.6 g/mol

Mass = 14.0 g

Approximately 13.70 grams of mercury (Hg) will be formed in the reaction.

Calculating the molar masses of the reactants and products in the balanced chemical equation and using stoichiometry will give us the mercury mass.

[tex]Hg(NO_{3})_2[/tex] molar mass:

Mercury (Hg) weighs 200.59 g/mol.

Nitrogen (N) weighs 14.01 g/mol.

O (oxygen) weighs 16.00 g/mol.

Since[tex]Hg(NO_{3})_{2}[/tex]  has two nitrate ions ([tex]NO_{3}[/tex]), we double the molar mass of [tex]NO_{3}[/tex] (62.00 g/mol) by 2.

The molar mass of [tex]Hg(NO_{3})_2[/tex]  is 324.61 g/mol: 200.59 g/mol + 2(14.01 g/mol + 3(16.00 g/mol)) = 200.59 g/mol + 2(48.00 g/mol) = 200.59 + 2(62.01 g/mol) = 200.59 + 124.02 = 324.61.

From the balanced equation, Hg(NO3)2 and Hg have a 1:1 molar ratio. Hg(NO3)2 creates one mole of Hg.

Calculate [tex]Hg(NO_{3})_2[/tex]moles:

22.17 g [tex]Hg(NO_{3})_2[/tex]

22.17 g/324.61 g/mol = 0.0682 mol.

Hg forms 0.0682 mol due to the 1:1 molar ratio.

Hg mass:

Hg's mass is 0.0682 mol × 200.59 g/mol = 13.70 g.

The process will produce 13.70 grammes of mercury (Hg).

Learn more about molar mass, here:

https://brainly.com/question/12127540

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Answer:

d) Sugar and water​

Explanation:

The sugar and water solution will have a clear and transparent outlook.

When we look at a solution of a mixture of sugar and water, it a homogenous one.

A homogenous solution have their solution in one phase.

The solute is sugar and the solvent is water.

The solution obtained is colorless therefore, light will pass through without any obstruction.

The other solutions will be translucent or opaque

Answer:

[tex]m=0.15mg[/tex]

Explanation:

Hello!

In this case, since the concentration of the fluoride ion in the vitamin drug product is:

[tex]0.25\frac{mg}{mL}[/tex]

Now, since the used volume of product was 0.6 mL, the following grams are going to be present:

[tex]m=0.25\frac{mg}{mL}*0.6mL \\\\m=0.15mg[/tex]

Best regards!

Answer:

A

Explanation:

Answer:

Beryllium

Explanation:

From the information given: Beryllium has the ability to form a monoatomic divalent metal cation. The atomic number (Z) is 4 and the mass number is 9. The atomic element of (Z-1) is Li and that of (Z-2) is He. The elements they are referring to that share the same similar biological importance within Beryllium are Magnesium and Calcium because they are in the same group.

The atomic radii of He = 140

The atomic radii of Li = 182; &

The atomic radii of Be = 153 pm

Answer:

32.1 g

Explanation:

Step 1: Write the balanced combustion reaction

C₄H₁₀ + 6.5 O₂ ⇒ 4 CO₂ + 5 H₂O

Step 2: Calculate the moles corresponding to 97.4 g of CO₂

The molar mass of CO₂ is 44.01 g/mol.

97.4 g × 1 mol/44.01 g = 2.21 mol

Step 3: Calculate the moles of butane that produced 2.21 moles of carbon dioxide

The molar ratio of C₄H₁₀ to CO₂ is 1:4. The moles of C₄H₁₀ required are 1/4 × 2.21 mol = 0.553 mol

Step 4: Calculate the mass corresponding to 0.553 moles of C₄H₁₀

The molar mass of C₄H₁₀ is 58.12 g/mol.

0.553 mol × 58.12 g/mol = 32.1 g

Answer:

The options are

A. a hypothesis

B. a theory

C. a research question

D. a scientific explanation

The answer is A. a hypothesis

Explanation:

A hypothesis is referred to as a brief explanation on the occurrence of an event.

In the example above using of warm water on plants was inferred to make it grow faster as hot water increases the metabolism.

Answer:

Option A

Explanation:

The choice A accurately specifies and illustrates the orbital diagram of a Nitrogen atom with 7 electrons.

Based on the number of electrons in a Nitrogen atom, there are two energy levels, the s and p sub-levels:  

        Nitrogen  = 2, 5

The first energy level, S will take up two electrons with opposite spin.

The second energy level will have 5 electrons in an S and P orbital.

Configuration 1 is correct because, it satisfies the premise that half and fully filled orbitals are also stable.

Answer:

0.18mol

Explanation:

Given parameters:

Mass of CaCl₂  = 20g

Unknown:

Number of moles = ?

Solution:

To solve this problem;

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

Molar mass of CaCl₂ = 40 + 2(35.5) = 111g/mol

     Number of moles  = [tex]\frac{20}{111}[/tex] = 0.18mol

Answer/Explanation: Oxygen becomes liquid at -183°C.

Liquid nitrogen has a lower boiling point at −196 °C (77 K) than oxygen's −183 °C (90 K), and vessels containing liquid nitrogen can condense oxygen from air.

Answer:

2KOH(aq) + NiSO₂(aq) → K₂SO₄(aq) + NiOH₂(s)

Explanation:

This reaction is an example of a double-replacement reaction where the cations of two compounds exchange with its anions. In the reaction:

KOH(aq) + NiSO₄(aq)

There are produced K₂SO₄ and NiOH₂ salts (The last one is insoluble, its state is (s) but K₂SO₄ is very soluble, its state is (aq). The unbalanced reaction is:

KOH(aq) + NiSO₄(aq) → K₂SO₄(aq) + NiOH₂(s)

To balance the potassiums:

And now, the reaction is balanced

Answer:

as no. of protons is equals to the no. of electrons so, it is a neutral atom.

but, as Atomic No. = Mass No. - No. of neutrons

Atomic No. = No. of protons = 18

so, Mass No. = Atomic No. + No. of Neutrons= 18 + 20 = 38

so, correct option is C.

Explanation:

Answer:

48 kg

Explanation:

1 kilogram = 2.2 pounds

Answer:

a.

can be made up of a combination of different elements.

Answer:

[tex]C_2H_3O[/tex]

Explanation:

Hello!

In this case, since the percent composition analysis provide the by-mass percent of each atom in the molecule, we can assume we have 52 g of carbon, 13 g of hydrogen and 35 g of oxygen, so we are able to compute the moles based on their atomic masses:

[tex]n_C=\frac{52g}{12.01g/mol} =4.33\\\\n_H=\frac{13g}{2.02g/mol}=6.44\\\\n_O=\frac{35g}{16.00g/mol}=2.19[/tex]

Now we divide all the moles by those of oxygen as the fewest ones in order to obtain their subscripts in the empirical formula:

[tex]C=\frac{4.33}{2.19} =2.0\\\\H=\frac{6.44}{2.19} =3.0\\\\O=\frac{2.19}{2.19} =1[/tex]

Thus, the empirical formula is:

[tex]C_2H_3O[/tex]

Best regards!

Answer:

c2h6o

Explanation: