Can someone please help me answer these 2 questions

Answer:

alleles

Explanation:

Answer:

Molecules must collide in order to react. In order to effectively initiate a reaction, collisions must be sufficiently energetic ( kinetic energy ) to break chemical bonds; this energy is known as the activation energy.

Explanation:

Hope this helps!

Answer:

Explanation: When solutions of potassium iodide and lead nitrate are combined?

The lead nitrate solution contains particles (ions) of lead, and the potassium iodide solution contains particles of iodide. When the solutions mix, the lead particles and iodide particles combine and create two new compounds, a yellow solid called lead iodide and a white solid called potassium nitrate. Chemical Equation Balancer Pb(NO3)2 + KI = KNO3 + PbI2. Potassium iodide and lead(II) nitrate are combined and undergo a double replacement reaction. Potassium iodide reacts with lead(II) nitrate and produces lead(II) iodide and potassium nitrate. Potassium nitrate is water soluble. The reaction is an example of a metathesis reaction, which involves the exchange of ions between the Pb(NO3)2 and KI. The Pb+2 ends up going after the I- resulting in the formation of PbI2, and the K+ ends up combining with the NO3- forming KNO3. NO3- All nitrates are soluble. ... (Many acid phosphates are soluble.)

The net ionic equation for the reaction that occurs when solutions of lead(II) nitrate and potassium iodide are combined in a test tube is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

Solutions of lead(II) nitrate and potassium iodide were combined in a test tube. This is a double displacement reaction. The complete ionic equation is:

Pb²⁺(aq) + 2 NO₃⁻(aq) + 2 K⁺(aq) + 2 I⁻(aq) ⇒ 2 K⁺(aq) + 2 NO₃⁻(aq) + PbI₂(s)

Spectator ions are those that appear both in the reactants and in the products. They do not participate in the reaction, so they do not appear in the net ionic equation. The net ionic equation is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

The net ionic equation for the reaction that occurs when solutions of lead(II) nitrate and potassium iodide are combined in a test tube is:

Pb²⁺(aq) + 2 I⁻(aq) ⇒ PbI₂(s)

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Answer:

Visible Light

Explanation:

Answer:

I believe that the answer is visible light

Answer:

[tex]322014\ \text{J}[/tex]

Explanation:

m = Mass of water = 1 kg

c = Specific heat of water = [tex]4182\ \text{J/kg}^{\circ}\text{C}[/tex]

[tex]\Delta T[/tex] = Change in temperature = [tex](99-22)^{\circ}\text{C}[/tex]

Heat or energy required in the system is

[tex]Q=mc\Delta T\\\Rightarrow Q=1\times 4182\times (99-22)\\\Rightarrow Q=322014\ \text{J}[/tex]

The energy required is [tex]322014\ \text{J}[/tex]

Unit of energy is Joule

[tex]mc\Delta T=\text{kg}\times \dfrac{\text{J}}{\text{kg}^{\circ}\text{C}}\times\ ^{\circ}\text{C}=\text{J}[/tex]

As heat is being absorbed by the water it is endothermic in nature.

There are two kinds of motion that earth possess, one is rotation and other is revolution. Therefore,  earth does not stay in one place throughout the year. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars.

The motion of the earth around its axis is known as rotation. Revolution refers to the motion of the earth about the sun in a fixed route or orbit. The earth's axis, which is an invisible line, forms a 6612° angle with its planet's orbit.

No, the earth does not remain stationary throughout the year. The Earth revolves around the sun. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars, therefore it is neither too hot nor too cold.

Therefore,  earth does not stay in one place throughout the year. The earth revolves and spins around the sun. The Earth is situated between Venus and Mars.

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Answer:

2.499 mol HCl

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

1.505 × 10²⁴ atoms HCl (Hydrochloric acid)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[tex]1.505 \cdot 10^{24} \ atoms \ HCl(\frac{1 \ mol \ HCl}{6.022 \cdot 10^{23} \ atoms \ HCl} )[/tex] = 2.49917 mol HCl

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

2.49917 mol HCl ≈ 2.499 mol HCl

Answer:

D

Explanation:

Bases have a bitter taste, slippery when touched and they can form hydronium ions. (they can conduct electricity.)

Answer:

D

Explanation:

Answer: yellow

When you mix solutions of lead (II) nitrate and potassium iodide. The precipitate is yellow in colour and the compound is lead (II) Iodide. Pb (NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq). Yes, it is a double displacement reaction.

Explanation:  The lead nitrate solution contains particles (ions) of lead, and the potassium iodide solution contains particles of iodide. When the solutions mix, the lead particles and iodide particles combine and create two new compounds, a yellow solid called lead iodide and a white solid called potassium nitrate. When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed along with lead iodide.  When lead nitrate is mix with potassium iodine, a precipitation reaction occurs and yellow precipitate of lead iodide is formed.

Answer:

Explanation:

I think 480. It should be able to give off more than it has and some of that energy is transferred.

Answer:

B

Explanation:

Two quick google searches later I grace you with the google has bestowed upon me

Answer:

I would say 3 but I not exactly sure

Answer:

i can help i think depends on the question! :)

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question we have

[tex]volume = \frac{26.4}{1.59} \\ = 16.60377...[/tex]

We have the final answer as

Hope this helps you

Answer:

lose

Explanation:

its lose because if its positive, assume the electron is a person who has already eaten, theyre full and dont want more, therefore they would want to lose the weight, so its lose.

The answer is  C.) Evidence

Answer:

i think your answer is carbon because it has 6 neutrons and electron is also 6

Answer:

A. water evaporating. it must be there.

Answer:

Using glucose to provide energy for the body

Explanation:

Answer:

The answer is alpha, beta, and gamma

Explanation:

I took this quiz, and that answer was correct.

(Good luck on primavera my G)

Answer: the covalent atomic radius is half the internuclear distance in a molecule with two identical.

Explanation:

Answer: the eukaryotic cell

Explanation: Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall.

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.

Explanation:

Answer:

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.v

Explanation:

Answer:

D

Explanation:

WOOOOOO

The statement which best compares DNA and RNA with regard to the process of protein production is that RNA leaves the nucleus during the process and DNA remains in the nucleus.

DNA is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Answer:

The answer is B!

Explanation:

if they are lower this means that they have been on the ground longer there for older

The statement that is true about fossils is that fossils  found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

They are the types of rocks which are formed as a result of accumulation of minerals or organic particles at the surface of the earth.Sedimentation is the name given to a collective process which cause the particles to settle.

The study of sedimentary rocks is useful in civil engineering and as important sources of coal, fossil fuels and ores.The color of sedimentary rock is often determined by iron content and sometimes due to the presence of organic matter.

They are classified based on origin in to 4 types which are clastic, biochemical ,chemical and other sedimentary rocks.While based on composition they are classified as siliciclastic,carbonate ,evaporite,organic rich,siliceous ,iron-rich and phosphatic sedimentary rocks.

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