can you please help ​

Answer:

Explanation:

The atomic number is the number of protons inside the nucleus of an atom. ... 1.1% carbon 13 with 7 neutrons and a mass of 13.00335 u (measured), and a ... The value given is the mass number of the most stable isotope of that element. ... That's because the chemistry of helium is more like neon (Ne), argon (Ar), etc.

Answer:

5.92E-4 or 5.92x10^-4

Explanation:

Answer:

D

Explanation:

A is a compound

B is purified water

C is a substance made by two substances

Hope this helps

Answer:

[tex]V=0.001\ m^3[/tex]

Explanation:

Mass, m = 1 kg

The density of water, d = 1000 kg/m³

We need to find the volume of water. The formula for the density of an object is equal to mass divided by volume. Its formula is :

d = m/V

V is the volume of water

[tex]V=\dfrac{m}{d}\\\\V=\dfrac{1\ kg}{1000\ kg/m^3}\\\\=0.001\ m^3[/tex]

So, the volume of water is [tex]0.001\ m^3[/tex].

Answer:

Volume of water has a mass of 1 kg  is explained below in details.

Explanation:

One liter of h2O has a volume of approximately specifically one kilogram when estimated at its maximum frequency, which happens at about 4 °C. It observes, therefore, that thousand of a liter, recognized as one milliliter (1 mL), of h2O has a volume of about 1 g; 1000 liters of h2O has a volume of about 1000 kg (1 tonne).

The answer is B

HF, because both fluorine and hydrogen are capable of forming only one covalent bond.

The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond. The correct option is option B.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Covalent  bond is weaker than ionic bond.

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron.

The formula for a compound made from fluorine and hydrogen is HF, because both fluorine and hydrogen are capable of forming only one covalent bond.

Therefore, the correct option is option B.

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Answer:

I believe it's j, convergent plate boundaries

The type of plate boundary that forms snowy mountains are convergent plate boundaries. option J is correct.

The convergent plate boundaries are which consist of two plates that move toward each other which results in the process called collision of two plates with each other.

The snowy mountains are full of snow which melts due to the change in temperature and leads to the formation of different plates and boundaries and the collision of two continental plates leads to the formation of this.

Therefore, option J is correct, the type of plate boundary that forms snowy mountains are convergent plate boundaries.

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Answer:

6O₂

General Formulas and Concepts:

Chemistry/Biology

Explanation:

Most of the equation comes from the Photosynthesis Equation. Plants take in water and carbon dioxide and sunlight (energy) to produce glucose and oxygen. When we balance the equation and predict reaction. we should get   6O₂ as our answer.

We will use dimensional analysis to solve this.

We will need to know Avogadro's number, which is 6.02 × 10²³.

4.5 mol × [tex]\frac{6.02 * 10^{23} molecules}{1 mol}[/tex] = 2.71 × 10²⁴ molecules.

There are 2.71 × 10²⁴ molecules in 4.5 moles of Ca(OH).

Answer: Sugar

Explanation: Because after photosynthesis (Carbon dioxide, water, and sunlight) react, they make two products. Glucose (A sugar) and Oxygen.

Answer:

12.208 L

Explanation:

We'll begin by calculating the number of mole in 25 g of Na. This can be obtained as follow:

Mass of Na = 25 g

Molar mass of Na = 23 g/mol

Mole of Na =?

Mole = mass /Molar mass

Mole of Na = 25/23

Mole of Na = 1.09 moles

Next, we shall determine the number of mole of Cl2 required to react with 1.09 moles of Na. This can be obtained as follow:

2Na + Cl2 –> 2NaCl

From the balanced equation above,

2 moles of Na reacted with 1 mole of Cl2.

Therefore, 1.09 moles of Na will react with = (1.09 × 1)/2 = 0.545 mole of Cl2.

Thus, 0.545 mole of Cl2 is needed for the reaction.

Finally, we shall determine the volume of Cl2 required for the react as follow:

Recall: 1 mole of any gas occupy 22.4 L at STP.

1 mole of Cl2 occupied 22.4 L at STP.

Therefore, 0.545 mole of Cl2 of Cl2 will occupy = 0.545 × 22.4 = 12.208 L at STP.

Therefore, 12.208 L of Cl2 is needed for the reaction.

Answer:

One is a fluid and one is not.

Explanation:

Fluid is a common state of certain substances, or a type of matter. Liquid is one of the three phases or state of matter. Fluids flow and has some viscosity (thickness). Liquids also flows and it has volume, but no definite shape. A non fluid is a substance that is not a liquid.

Answer:

one is limited and one isn't

Answer:

3 times ....

group 2

Explanation:

Explanation:

This explanation is the opposite of true testing - a term known as falsifiability. Falsifiability, when it relates to science, refers to how it should be possible to prove a hypothesis or theory wrong. Thus, the point of testing for falsifiability is to test in which condition is the theory wrong.  

A term that might relate to the phrase ‘true testing’ used in the question would be testability. Which refers to the practice of testing a hypothesis or theory to see whether it is true or false.  

True testing has been the scientific method that uses various steps to conclude the findings. "True testing means that a serious effort is made to create experiments that support your hypothesis." Thus, option B is correct.

True testing has been defined as the assessment scientific method that is involved in solving the question and issue by formulating the hypothesis and then researching the possible observations and solution that concludes and proves the findings.

It falsifies or proves the hypotheses right or wrong based on the experimental design setup. It does not falsify each possible explanation, nor is always fully correct. It also is not conducted to support the manufacturing and support it financially.

Therefore, option B. True testing experiments to sustain the hypothesis.

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Answer:

it's B it's B It's B BBBBBBBBBBBBBBB

Answer:

d

Explanation:

(d) Liquid O2 conforms to the shape of its container but has a fixed volume; it contains relatively densely packed molecules. (c) Gaseous O2 fills ...

Missing: ice ‎| Must include: ice

use the formula p1v1= p2v2

for 1

300×300=500×x

x=180ml

Answer:

80000 grams

Explanation:

kilo  means 1000

80 x 1000 = 80, 000

Answer:

Explanation:

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

mass = Density × volume

From the question we have

mass = 5 × 200

We have the final answer as

Hope this helps you

Answer: rotation

Explanation:

orbitttttttttttt

Explanation:

There are 48.72 g  Fluorine ions

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison

%F in CaF₂ :

[tex]\tt \%F=\dfrac{2.Ar~F}{MW~CaF_2}\times 100\%\\\\\%F=\dfrac{2.19}{78}\times 100\5=48.72\%[/tex]

mass of Fluorine :

[tex]\tt 48.72\%\times 200=97.44~g[/tex]

So mass Fluorine ions(2 ions F in CaF₂⇒Ca²⁺+2F⁻) :

[tex]\tt =\dfrac{97.44}{2}=48.72~g[/tex]

Answer:

The name of the two parts found on the left side of the equation is reactants.

Explanation:

Chemical reaction is the way one substance reacts against another. That is, a chemical reaction is that chemical process in which two or more substances, by the action of an energy factor, are converted into other substances. The new substance (s) that are formed usually present a totally different appearance from that of the starting substances.

In a chemical reaction there are the substances that react, that is, the reactants, and the substances produced, called products.

A chemical reaction is represented by a chemical equation. The formulas of the reactants are written on the left, and those of the products on the right, both separated by an arrow indicating the direction of the reaction.

Reactants ⇒ Products

Then, the name of the two parts found on the left side of the equation is reactants.

Answer:

C)0.0998kg

explanation:

1 POUND=0.453592...kg

Answer:

the color change

Decomposition reaction D. 2H20⇒ 2H2 + O2

Every chemical reaction involves a compound consisting of reactants and products  

Reactants are compounds that react and form new compounds called products

There are several forms of reactions that can occur, including single replacement, double replacement, synthesis, decomposition, etc.

A. 2C2H6 + 702 ⇒ 4CO2 + 6H20

Combustion : reaction of Hydrocarbon and Oxygen

B. AgNO3 + LiCl → AgCl + LINO3

Double replacement : there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

C. Ca + MgS → CaS + Mg

Single replacement :one element replaces the other elements of a compound to produce new elements and compounds

D. 2H20⇒ 2H2 + O2

Decomposition : One compound breaks down into 2 components

Decomposition, often known as rot, is the breakdown of dead organic matter into more basic organic or inorganic components such as carbon dioxide, water, simple sugars, and mineral salts. Here among the given options, the decomposition reaction is 2H₂O→ 2H₂ + O₂. The correct option is D.

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium chlorate (KClO₃) is a typical technique used in laboratories to generate oxygen gas.

Soft drink carbonic acid breaks down to release carbon dioxide gas. As water breaks down, gases like hydrogen and oxygen are released. Food digestion is a response to breakdown.

Thus the correct option is D.

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Answer:

Intake

Explanation:

It is the very first thing you do.

Figure 4: Four-Stroke Cycle In the first stroke, also known as the Intake Stroke or Induction, the piston travels from the top dead centre (TDC) to the bottom dead centre (BDC) with the intake valve open and exhaust valve closed. This creates a vacuum due to the increase in volume in the combustion chamber.

The stroke cycle is used in the operating cycle of gasoline or petroleum engines. The first stroke in the 4 stroke cycle is intake. Hence, option A is correct.

An internal combustion (IC) engine is referred to as having four strokes  when the piston is rotating the crankshaft. A stroke refers to the whole journey of the piston along the cylinder, in either direction.

In gasoline/petrol engines, a four-stroke cycle is used. The four strokes are intake (1), compression (2), power (3), and exhaust (4). The intake port is on the right's blue side, and the exhaust port is on the left's brown side.

The piston head is surrounded by a thin sleeve called the cylinder wall, which provides a space for the combustion of fuel and the production of mechanical energy. Therefore, the first stroke of a 4 stroke cycle is intake.

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Answer: More than one atom of the same type chemically joined together

Explanation:

An atom is the smallest unit of any matter which may or may not have independent existence. Example: Argon (Ar) is an element which exist as Ar atom only.

Molecule is the smallest unit of any matter which always have independent existence. For example: Hydrogen (H) is an element which can exist in nature as [tex]H_2[/tex] molecule only.

Atoms of different elements chemically joined together is called as a compound. Example: [tex]H_2O[/tex] is a compound formed by chemical combination of hydrogen (H) and oxygen (O) atom.

Answer:

Yes, that is correct!

Explanation:

Answer:

Yes

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Answer:

If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, ... If I contain 3.0 moles of gas in a container with a volume of 60. liters and at a ... Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ... volume of 5.00 Lat 25.0C. Calculate the partial pressure of each gas and the ...

Explanation:

The % yield of Ca(OH)₂ : 62.98%

Percent yield is the compare of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

CaO + H₂O ⇒ Ca(OH)₂

mass CaO= 4.2 g

mol CaO(MW=56,0774 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075[/tex]

mol Ca(OH)₂ based on mol CaO

mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075

mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical

[tex]\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g[/tex]

% yield :

[tex]\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%[/tex]