Gold is classified as what type of element?

Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

Answer:

82.04g

Explanation:

To solve this problem, you need to find the molar mass of HCl, which is the sum of the molar mass of H plus the molar mass of Cl. The molar mass of H is 1.008g/mol while the molar mass of Cl is 35.45g/mol. Thusly the molar mass of HCl is 36.458g/mol. You have 2.25 moles of HCl, so multiply the number of moles by the molar mass to get the mass in g. In this case it is 2.25mol * 36.458g/mol = 82.04g.

If I helped, a brainliest would be greatly appreciated!

Answer:

i needed that lol

thank you

Explanation:

Answer:   B. Magnesium, strontium, radium, barium

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.

Magnesium (Mg) , Strontium (Sr) , Radium (Ra) and Barium (Ba) are elements which belong to Group 2. They have 12, 38, 88 and 56 electrons respectively and contain 2 valence electrons each and need one electron to complete their octet.

The chemical reactivity of elements is governed by the valence electrons present in the element and thus they are alike in physical and chemical properties.

Answer:

The number of moles represented by 21.7 L is 0.96875 moles

Explanation:

The volume occupied by one mole of a gas which consists of (approximately) 6.022 × 10²³ elementary at STP is 22.4 L. The volume is known as the molar volume of gas

Therefore, the number of moles, 'n', present in 21.7 L of gas at STP is given as follows;

The number of moles represented by 22.4 L = 1 mole

∴ The number of moles represented by 21.7 L = 1 mole/22.4 L × 21.7 L = 0.96875 moles

The number of moles represented by 21.7 L = 0.96875 moles.

Answer:

each compound or molecule is indicated in subscript next to the compound by an abbreviation in parentheses. For example, a compound in the gas state would be indicated by (g), solid (s), liquid (l), and aqueous (aq).

Explanation:

Answer:

Here is every answer for analog and digital (in order)

Analog:

Digital (in order):

Explanation:

I did mine in bullet points, hopefully this helped!

Analog:

Signal Shape: Smooth and continuous

Numerical Values for Signal Estimations: Analog signals speak to one ceaseless variable as the result of another ceaseless time-based variable.

Amount of Information that can be transmitted: analog circuits can conduct as it were reasonably low-speed information communications.

Energy necessities: light, sound, temperature, position, and pressure Privacy and security : not encrypted

Clarity of Signal: clamor influences clarity and quality, commotion is amplified,

Digital:

Signal shape: stepping, square, and discrete

Numerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement

Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly.

Energy requirements: voltage, accoustic pressure.

Privacy and security: encrypted

Clarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is high

Analog signal could be a continuous signal which speaks to physical estimations.

Digital signals are discrete time signals created by computerized balance.

Example :Human voice in discuss, analog electronic gadgets. Computers, CDs, DVDs, and other advanced electronic gadgets.

Answer:

Formula and structure: The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol. It is an ionic compound consisting of the calcium cation (Ca2+) and two chlorine anions (Cl-). The bivalent calcium metal forms an ionic bond with two chlorine atoms, as shown below.

Based on the ionic nature of calcium chloride,  the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.

Ionic compounds are compounds which are composed of ions.

Calcium chloride is an ionic compound composed of the ions, calcium ions and chloride ions.

The chemical formula of calcium chloride is CaCl2, and its molar mass is 110.983 g/mol.

The symbol for  calcium ion is Ca²⁺

The symbol for chloride ion is Cl⁻.

Therefore, the chemical symbols of the particles found in the calcium chloride crystal is Ca²⁺ and Cl⁻.

Learn more about ionic compounds at: https://brainly.com/question/11638999

Answer:

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.

Explanation:

Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.

The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

To learn more about exercise, refer to the link below:

https://brainly.com/question/13128077

#SPJ2

Answer:

C

Explanation:

Answer:

D)

Explanation:

On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate. When this happens, the ocean plate sinks into the mantle.

Answer:

Lungs.

Explanation:

They bring the blood throughout the body, to help it function properly

Answer:

8.43 x 1024 moles of I

Explanation:

Answer: The percent by mass concentration is 33.3 %

Explanation:

Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.

mass of solute = 50 g

mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]

Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]

Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %

Answer:

10

Explanation:

Answer:

Thermal Energy

Explanation:

The thermal energy of an object increases as the temperature increases, causing atoms and molecules to move faster. When the temperature decreases, the thermal energy decreases, causing atoms and molecules to move slower. Another term for thermal energy is heat energy.

Answer:

C₄H₆

Explanation:

A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.

To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:

54g/mol / 12g/mol = 4.5

As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:

12g/mol*4 = 48g/mol

And the hydrogens necessaries to suply the molecular mass are:

54 - 48 = 6 hydrogens

That means molecular formula is:

Answer:

D The atom gains an electron in an oxidation-reduction reaction.

Answer:

I think hydrogen because Hydrogen combined with one atom with oxygen and in hydrogen peroxide. It has two atoms of hydrogen and 2 atoms of oxygen. Therfore it should be a compound.

Answer:

An allotrope is one way that atoms can be arranged in a solid. An isotope is one way that protons and neutrons can form the same atomic element.

Answer: 9. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

10. The reasons for the differences in the surface temperature of terrestrial planets are due to their distance from the sun and the composition of their atmosphere.

11. 93.48 million miles

12. Iron core

Explanation: Hope this helped!! :)

Answer:

A: 9.033 × 10^(23) kg

Explanation:

According to avogadro's number, we know that;

1 mole = 6.022 × 10^(23) kg

Thus;

1½(1.5) mole of O2 will produce;

(1.5 × 6.022 × 10^(23))/1 = 9.033 × 10^(23) kg

Looking at the options, the correct one is Option A.

Answer:

1. Graphite rod (cathode)

2. Positive terminal

3. Solid zinc layer (anode)

4. Paste (reduction takes place here)

5. Negative terminal

Explanation:

This was the only thing i could find on it. hope this helps.

Answer:

Explanation:

• Label all parts.

1. Cathode or Graphite Rod

2. Positive terminal  

3. Anode or Solid Zinc layer  

4. Electrolyte Paste (reduction takes place here)

5. Negative Terminal (maybe this could also be the Zinc casing)  

• Label the cathode and the anode, including the charges on each.

The anode is the zinc layer is negatively charged and the cathode is the graphite rod is positively charged.  

• Show the flow of electrons.

The zinc casing is oxidized and the electrons flow along the zinc layer, into the negative terminal, and then out the negative terminal. The electrons move from the wire to the graphite rod. Then from the rod the electrons move to the paste, then the past goes through reduction. The anode gets a negative charge as electrons are released, and the cathode gets a positive charge as the electrons, which are negatively charged, are consumed.

• Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.

Alkaline dry cells use spontaneous oxidation-reduction reactions to convert chemical energy to electrical energy. According to the lesson ‘’Half-reactions are combined in a small casing, but still separated into half-cells.’’

Answer:

Your answer is B

Boron

Good luck

Explanation:

Answer: A reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.

Explanation:

When acid and base chemically combine together to form sat and water then it is know as neutralization reaction.

An acidic substance gives hydrogen ions [tex](H^{+})[/tex] on dissociation and a basic substance gives hydroxide ions [tex](OH^{-})[/tex] on dissociation.

For example, [tex]H^{+} + OH^{-} \rightarrow H_{2}O[/tex] is a neutralization reaction where an acid and base are mixed together to form water.

No salt is formed as because here the reactants are not present as compounds.

In a hydrolysis reaction, water molecule(s) is added to the reactant molecules.

For example, [tex]CH_{3}COOCH_{3} + H_2O \rightarrow CH_{3}COOH + CH_{3}OH[/tex]

Oxidation is the process of addition of oxygen to a molecule and removal of hydrogen.

Reduction is the process of addition of hydrogen in a compound and the removal of oxygen atom.

Therefore, we can conclude that reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.

Answer:

2H+(aq) + CaCO3(s) → Ca2+(aq) + H2O(l) +. CO2(g). [ 2]. Award [1] for correct reactants and products. Award [1] if the ... Exercises. 1 Reaction gives off a gas: change in volume could be measured.

Answer:

27J/Kmol

Explanation:

Heat = number of moles times the Moeller heat capacity chimes the change in temperature.

^ Q = nC△T

^ C = Q/ n△T = +53J / (1mol) (299.5K - 297.5K)

^ = 26.5 (rounded to 27)

Answer:

ph=2

Explanation:

Most of the matter making up earth is composed of compounds. I think