Someone pls help me I will make you brain

Answer: 7

Explanation:

protons + neutrons = atomic mass number

The two observations you would make about the atoms are

These observations were made by Ernest Rutherford in his model of the atom established in 1911, when he performed his gold foil experiment and observed the scattering angle of the alpha particles which led him to conclude that the mass of the atom was concentrated at the center.

Also, that most of the alpha particles also went through the gold foil suggested that the atom was made up basically of empty space.

So,

The two observations you would make about the atoms are

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Answer:

density is mass more mass more density and same as volume

Answer:

Baking soda is sodium bicarbonate, which requires acid and a liquid to become activated and help baked goods rise. Conversely, baking powder includes sodium bicarbonate, as well as an acid. It only needs a liquid to become activated. Substituting one for the other is possible with careful adjustments. Baking soda is strong. In fact, it is about 3-4x stronger than baking powder. More baking soda in a recipe doesn't necessarily mean more lift.

Explanation:

Explanation:

baking soda contains one ingredient, sodium bicarbonate. however, baking powder contains sodium bicarbonate , monocalcium phosphate and either sodium acid prophetess or sodium aluminum sulfate

Answer:

There's No Answer Im Sorry

We can use the formula M₁V₁ = M₂V₂ the total volume of water that will yield 0.800 M HCl. We can then subtract that from the initial volume to get how much water needs to be added.

Since M₁V₁ = M₂V₂    (starting mole× starting volume = end mole × end volume)

⇒  (5 mol)(20 mL) = (0.80 mol) V₂

         100 mol/mL = 0.8 mol × V₂

⇒                      V₂ = 100 mol/mL ÷ 0.8 mol

                             = 125 m

Since we began with 20.0 mL of water,

water needed to add = 125 mL - 20 mL = 105 mL

Block B  will need to  absorb more energy as it has higher specific heat value.

Specific heat is defined as the amount of heat required  to raise the temperature of one gram of a substance  by one degree Celsius rise. Units of specific heat  are calories or joules  per gram per degree Celsius.

Specific heat capacity  varies with temperature often  and is different for each state of matter. While the substance which undergoes phase transition then it's specific heat is technically infinite.

Specific heat of a gas is significantly higher when it is allowed to expand  as it is heated .It may also be referred to as a ratio  between the specific heat capacities of two substances at a given temperature.It is calculated by the formula ,Q=mcT

For copper, it is 100×0.385×473=18210.5 J

For aluminium ,it is 100×0.90×473=42570 J

As  the specific heat of aluminium is higher it will absorb more energy.

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Explanation:

1. Attachment

Electron dot structure of H2S (hydrogen sulfide)

2. Attachment

Electron dot structure of F2 (Fluorine).

Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.

Answer:

As per Dalton's law of Partial pressure,

The total pressure of a mixture of gases is equal to sum of partial pressure of individual components of the mixture.

So,P=P_H+P_N+P_WP=P  

H

​

+P  

N

​

+P  

W

​

\implies 864\ mm=220\ mm+410\ mm+P_W\implies⟹864 mm=220 mm+410 mm+P  

W

​

⟹ P_W=864-630=234P  

W

​

=864−630=234 mm of Hg.

Explanation:

"The partial pressure of water vapor is 234 mm Hg."

What is partial pressure?

The force that a gas exerts is known as partial pressure. The total pressure of a mixture of gases is equal to the sum of their partial pressures.

Partial pressure can be calculated by using the formula: [tex]P_{Total} =P_{N} +P_{H} +P_{H}[/tex]

Puts the value of given data in above equation.

[tex]Px_{W} =864-410-220\\\\= 234 mm Hg[/tex]

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A

Explanation:

sodium is a chemical element with the symbol and the atomic number is 11

Answer:

cutting of an apple is both physical and chemical change

because cutting a apple, the size and shape of the apple changes. it will be a chemical change because after cutting an apple, the color apple changes when left open

Answer:

Refer to the attachment

Answer:

covalent bonds

Explanation:

ionic transfer of e^- ions formed (charges)

ionic=non-metal+ metal

ex: F+Ca

covalent sharing e^- no true charges

covalent= non-metal+ non-metal

ex: F+P

( my notes)

Answer: Well, when you decrease the temperature in a gas the volume will decrease as well as the pressure. Since, heating a gas or liquid increases the temperature/pressure. Therefore, it'd increase the volume but since the temperature is decreasing the volume of the gas does too.

ANSWER : I AND III

HOPE IT HELPED

Answer:

Potassium Hydroxide Solution =

or

Potassium Hydroxide =

Since we know the products and one of the reactions, we can work backward to discover what the other reactant may be.

As it is in the question, we can map the reactants and product:

Reactants                   Product

Ammonium                 Ammonia

Sulfate                         Sulfate

________                   Potassium

________                    Water

Since the reaction will yield Potassium and water, the likely reactant is Potassium Hydroxide (KOH). This is because we know that Ammonium lost a Hydrogen atom that could combine with the Hydroxide radical to form water.

This becomes clear when we consider the net ionic equation:

Ammonium sulphate + Potassium Hydroxide → potassium sulfate + ammonia + water

if we write this a balanced chemical equation:

(NH₄)₂SO₄   +  2KOH  →  K₂SO₄ + 2NH₃ + 2H₂O

if we write the reaction as an ionic equation

2NH₄⁺ + SO₄⁻ + 2K⁺ + 2OH⁻ → 2K⁺ + SO₄⁻ + 2NH₃ + 2H₂O

if we remove the ions that appear on both the reactant and product side (spectator ions)

Answer:

A) FeO

Explanation:

Options:

A) FeO

B) FeO2

C) Fe2O

D) Fe7O2

The correct answer is A) FeO.

(Hope this helps can I pls have brainlist (crown)☺️)

The empirical formula of a compound that contains only iron and oxygen and is 22.27% oxygen is FeO. The correct option is A.

The simplest whole number ratio of atoms in a chemical molecule is its empirical formula. The empirical formula is the chemical formula that gives the number of atoms of the chemical formula that is given in the chemical reaction.

For example, the C₆H₁₂O₆ is the formula of glucose. The simplest formula is CH₂O. This will be the simplest ratio of this compound. The first one, this C₆H₁₂O₆ is the molecular formula.

It only contains the element one quantity.  The empirical formula that contains oxygen and iron will be FeO. The empirical formulas is calculated by dividing the simplest formula.

Thus, the correct option is A) FeO.

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The question is incomplete. Your most probably complete question is given below:

A) FeO

B) FeO2

C) Fe2O

D) Fe7O2

Answer: When a convergent boundary occurs between two oceanic plates, one of those plates will subduct beneath the other. Normally the older plate will subduct because of its higher density. The subducting plate is heated as it is forced deeper into the mantle, and at a depth of about 100 miles (150 km) the plate begins to melt.

Explanation:

answer:

the reason is to ensure more solute is dissolving as it cools down. it is important to do it slowly because water will be sucked into buchner flask by a partial vaccum through the rubber tubing and be able to arrange molecules.

Answer:

That would be a community.

Explanation:

A field of many different species of wildflowers is considered to be a community.

It is called biological community meaning an interacting  group of various species sharing a common location.Factors which determine overall structure of community  are number of species, abundance of each species,interaction among the species and community's ability to return to normal after a natural calamity.

Change of communities over a period of  time is called as ecological succession.Each species in a community has its own characteristic niche . The niche includes all the interactions of the species with other members of the community.An ecosystem comprises of biological community together with its physical environment.

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Answer:

wood burning and cookies baking

Explanation:

took the test <333

Answer:

Wood burning and cookies baking

Explanation:

Answer:

i have no clue

Explanation:

umm cause i have no clue sorry lol but good luck

Answer:

when you heat the blend, you form iron sulfide, a compound

Depending on the ratio, you could form Fe4S3 or fool's gold

Explanation:When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S. Therefore, heating of mixture of iron and sulphur powder is a chemical change forming a compoundf

Answer:

it releases energy that is used for power

Explanation:

Answer: It releases energy that is used for power.

Explanation: https://www.investopedia.com/terms/h/hydrocarbon.asp

Answer:

I think its B but im not too sure