What kind of elements are on the left side of the zig-zag line on the periodic table? ​

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:  

50 milliliters of acetone solution

Explanation:

If a solution is 40% by volume of acetone, then we have  40 mL of acetone in a 100 mL solution. So if we have 20 mL of acetone, we get: 100 mL solution 40 mL ( CH3) 2CO⋅

20mL (CH3) 2CO  =50mL solution

The volume percent of 40% indicates that 40 ml of acetone is present in 100 ml solution. Then, 20 ml acetone can be made into 50 ml solution.

Volume percentage is a common term used to express the concentration of a solution. Volume percentage of a solution is the ratio of the volume of the solute to the volume of the solvent multiplied by 100.

The volume percentage of the solution measures how much volume of the solute is present in 100 ml of the solution. Thus a 50% by volume solution is 50 ml solute in 100 ml solution.

Given that volume percentage of acetone = 40%.

that is 40 ml of acetone is present in 100 ml of the solution.

Therefore, the volume of the solution containing 20 ml of acetone is :

(20 × 100)/40 = 50 ml.

Therefore, 50 ml of  40% by volume o solution can be made by 20 ml of acetone.

Find more on volume percentage:

https://brainly.com/question/28998211

#SPJ7

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: To efficiently communicate with others

Explanation:

this was the right on answer for me might be different for others

The main need or want the wave technology shown meets to see objects surrounding more clearly.

It is a floating device that operates in the same direction as the waves. With the use of the technology, energy may be captured even from relatively small waves. The device that is moved by waves activates a hydraulic system that can power a generator. The tube segment contains all the generation equipment and systems.

Early mechanization (1770s to 1830s), steam power and railroads (1830s to 1880s), electrical and heavy engineering (1880s to 1930s), Fordist mass production (1930s to 1970s), and information and communication are the five waves that have so far slammed into our society (1970s to 2010s).

Wave energy, also known as wave power, is the energy that ocean surface waves carry and absorb. The energy is then put to use in a variety of productive ways.

Thus, The main need or want the wave technology shown meets to see objects surrounding more clearly.

To learn more about the wave technology, follow the link;

https://brainly.com/question/23345080

#SPJ5

Answer:

it is converted to kinetic energy

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:

See explanation

Explanation:

The valence shell electron pair repulsion theory states that; the number of electron pairs present on the valence shell of the central atom in a molecule is the final determinant of shape of the molecule.

Based on this theory, the electron domain geometry of a molecule having 4 outer atoms and 1 lone pairs on the central atom should be based on a trigonal bipyramid. The molecular geometry of this molecule is see saw with a bond angle of <90 degrees(axial) and <120 degrees(equatorial).

Answer:

alkali metals

alkali earth metals

transition metals

non metals

noble gases

halogens

rare earth metals

Explanation:

Answer:

Your answer is B

Boron

Good luck

Explanation:

Answer:

As known matter is anything that occupies space and has mass.

Answer:

Density = mass / volume.

If this is an ideal gas then 1mol will take up 22.4L of volume (fact about ideal gases you should remember)

Since you have 1mol then you know the volume of the gas that you have (22.4L)

Now, just convert 1mol of CO to grams.The ptable tells you that the mass of 1 mol of C is 12g and the mass of 1 mol of O is 16g. So the mass of 1 mol of CO is......... :):)

Now you have the mass and the volume, so just divide :) enjoy

Answer:

0.38

Explanation:

The formula for finding density is mass/volume. So the equation becomes 6.39/16.5 which gives you 0.38

Answer: H2O

Explanation: pure H2O does not contain ions which could

Transfer charge. Other substances in water solution forms ions.

Answer:

14.7 g of chromium

Explanation:

Answer:

A.

Explanation:

The 2 - butene is an alkene with the formula C4H8, which can be used as the polybutene monomer or co-polymer. It is a compressed liquefied gas colorless, highly flammable characteristic odor. Prolonged exposure to this gas can cause frostbite causing a lowering of consciousness. Its formula is C4H8 and it is made up of 4 carbon atoms.

The best structure that describes 2-butene is that of Option A.

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:

Q = 2997.69 J

Explanation:

Given that,

The mass of ice, m = 15.6 grams

The temperature increases from -8.76 degrees Celsius to 85.9 degrees Celsius.

The specifc heat of ice is 2.03 J/g°C

We need to find the amount of energy required. The formula for energy required is given by :

[tex]Q=mc\Delta T\\\\=15.6\times 2.03\times (85.9-(-8.76))\\\\=2997.69\ J[/tex]

So, the required heat is equal to 2997.69 J.

Answer:

There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)

Explanation:

Hope it helps u

FOLLOW MY ACCOUNT PLS PLS

Answer:

[tex]C=2.45\frac{J}{g\°C}[/tex]

Explanation:

Hello there!

In this case, since the thermodynamic definition of heat in terms of mass, specific heat and temperatures is given by:

[tex]Q=mC(T_2-T_1)[/tex]

We are to calculate the specific heat of the ethanol as shown below:

[tex]C=\frac{Q}{m(T_2-T_1)}[/tex]

Thus, by plugging it the given data we can obtain:

[tex]C=\frac{4650J}{250.0g(29.6-22.00\°C)} \\\\C=2.45\frac{J}{g\°C}[/tex]

Regards!

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:

B: Parent rock breaks into smaller pieces.

Explanation:

Weathering the first step in  the process of soil formation. The process of breaking up off the parent rocks into simple forms, is termed as weathering. The formation of soil is a very gradual and slow process. It takes millions of years for the rocks to become soil. The dead and decaying matter of plants and animals are also included in the rocks. Water, sun, climatic conditions and rain are some of the factors that effect weathering.

Answer:

32

Explanation:

I found it

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:

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:

Lungs.

Explanation:

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

Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.

Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.

Friction can be described as a force that is dependent on external factors.  Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.

Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.

The force of friction acts in the opposite direction to the direction of an object's motion.

Learn more about friction, here:

https://brainly.com/question/13000653

#SPJ2

Answer:

ph=2

Explanation:

Answer:

28.93 g/mol

Explanation:

This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]

We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.

Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.

[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]

The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.

[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]

[tex]{\frac{M2}{131} } = (0.47)^2[/tex]

[tex]{\frac{M2}{131} } = 0.22[/tex]

M2= 0.22 x 131

M2= 28.93 g/mol