How do elements differ going from left to right across a period on the periodic table?

please choose one
They become more valuable.

They become lighter.

They become more radioactive.

Their atomic number increases.

Answer:

The reactant in an enzyme-catalyzed reaction is called a substrate.

Explanation:

Answer:

The bracelet is made of gold.

Explanation:

The bracelet displaces the water by [tex]11.7cm^3-9.2cm^3 = 2.5cm^3[/tex] and thus has a volume of [tex]2.5cm^3[/tex]. If the bracelet has a mass of 45g, we know that the density of the bracelet is then [tex]\frac{45g}{2.5cm^3}[/tex], which can be simplified to [tex]18\frac{g}{cm^3}[/tex]. This is closer to the density of gold, so it can be assumed that the bracelet is made of gold.

Petroleum is used to make plastics,Petroleum is used to make petrochemicals,Petroleum is found in sedimentary rock these properties are true of petroleum.

Petroleum is used to make plastics,Petroleum is used to make petrochemicals,Petroleum is found in sedimentary rock these properties are true of petroleum.

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Answer:

Covalent blood

Explanation:

A covalent bond is the force of attraction that holds together two atoms that share a pair of valence electrons. The shared electrons are attracted to the nuclei of both atoms. This forms a molecule consisting of two or more atoms. Covalent bonds form only between atoms of nonmetals.

Answer:

There are three nuclei and one lone pair, so the molecular geometry is trigonal pyramidal.

Explanation:

Explanation:

Not all waves actually require a physical medium through which to travel. This fact allows us to put all waves into two broad categories:

Mechanical Wave - A wave that requires a physical medium through which to travel. Example - sound waves. Sound waves can not travel through a vacuum (empty space).

Electromagnetic Waves - Do not require a physical medium through which to travel. Electromagnetic waves can travel through a vacuum. Examples: Radio waves, visible light, x-rays, etc.

Answer:

A

Explanation:

We can use the heat transfer equation:

[tex]\displaystyle q = mC\Delta T[/tex]

Therefore:
[tex]\displaystyle \begin{aligned} q_\text{sol} & = m_\text{sol}C_\text{sol}\Delta T \\ \\ & = (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(22.6\text{ $^\circ$C}-55.0\text{ $^\circ$ C}) \\ \\ &= (200.\text{ g})\left(\frac{4.184\text{ J}}{\text{g - $^\circ$C}}\right)(-32.4\text{ $^\circ$C}) \\ \\ & \approx -27112 \text{ J} \end{aligned}[/tex]

In conclusion, the answer is A.

Note: Assuming that the reaction took place in the water, the heat released by the reaction should be positive instead of negative. Because the temperature of the water decreased, the reaction is endothermic. Hence, the water lost heat (what we calculated above) while the reaction absorbed heat. The heat released (or, rather, absorbed) by the reaction is thus +27,112 J. However, for the purposes of this question, A is the best choice.

An ice cube is placed on a kitchen counter then heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.

Heat flow is a process in which heat is transfered from hot body to the cold body.

So, when we place an ice cube to the counter of the kitchen and here ice is a colder body and counter is a warmer body so transfer of heat takes place from counter to the ice cube. As a result of which movement of particles of counter gets slow and of ice increases.

Hence in the given situation heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.

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Answer:

D

Explanation:

Edge 2022

The freezing point of a solution in which 2.5 grams of NaCl is added t0 230 ml of water is :  - 0.69°C

First step : Calculate the molality of NaCl

molality =  ( 2.5 grams / 58.44 g/mol ) / ( 230 * 10⁻³ kg/ml )

              = 0.186  mol/kg

Next step : Calculate freezing point depression temperature

T = 2 * 0.186 * kf

where : kf = 1.86°c.kg/mole

Hence; T = 2 * 0.186 * 1.86 = 0.69°C

Freezing point of the solution

Freezing temperature of solvent - freezing point depression temperature

                                               0°C  -  0.69°C = - 0.69°C

Hence the Freezing temperature of the solution is  - 0.69°C

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[tex]\tt \dfrac{2}{50}\times x=1.8\\\\x=\dfrac{1.8\times 50}{2}=45~apple~seeds[/tex]

Answer:

Correct option is D)

Explanation:

Crystallization is the process that is used to separate a pure solid in the form of its crystals from a solution.

Copper sulphate, salt, and potash alum can be purified by this method. In this process, the solution of the substance is heated and then cooled to form crystals.

Answer:

Independent of initial concentrations

Explanation:

Initial concentrations do not affect equilibrium constant because equilibrium constant is found from equilibrium concentrations.

Answer:

269.5k is equivalent to -3.65 c

Explanation:

1 Kelvin = 1 - 273.15 = -272.15 Celsius

269.5 Kelvin = 269.5 - 273.15 = -3.65 Celsius

hope it helped :)

269.5 K

269.5 K in C°

formula= 0K − 273.15 = -273.1°C

= -3.65 °C.

Answer:

It wouldn't be 9am in New York because San Francisco is 3 hours behind of New York

Explanation:

Answer:

1800

Explanation:

2000 - 40(5) = 1800

[tex] \frac{no {}^{2} }{1} = \frac{nmgo}{2} [/tex]

[tex]nmgo = no {}^{2} \times 2 = 7.2 \times 2 = 14.4[/tex]

Note that n stands for the number of moles.

Answer:

Jellyfish :)

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Answer:

Gold is dense, soft, shiny, and most malleable of all the metals known. Gold is a transition metal that is attacked by chlorine, fluorine, and cyanide. Gold is the 79th element in the periodic table. it has 79 protons in its nucleus and 79 outter electrons.

Explanation:

please consider as brainlest if i helped you

Answer:

The answer should be A. It cannot be broken down into another substance. :)

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The concentration of hydrochloric acid with a volume of 25mL titrated with 34.55 mL of 0.1020 M sodium hydroxide is 0.141M.

The concentration of an acid in a titration procedure can be calculated using the following expression:

CaVa = CbVb

Where;

Ca × 25 = 0.102 × 34.55

25Ca = 3.52

Ca = 0.141M

Therefore, the concentration of hydrochloric acid with a volume of 25mL titrated with 34.55 mL of 0.1020 M sodium hydroxide is 0.141M.

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Explanation:

Answer:

Chemical Reaction

Explanation:

because one is a base and the other is an acid. Baking soda is a basic compound called sodium bicarbonate.

Answer:

The pressure of the balloon is 0.98 atm

Explanation:

Using the equation P1V1 = P2V2, you can solve for the value of V2, which is 0.98 atm.

(P1V1)/P2 = V2

Plug in the numbers:

(6.5*1.5)/10.00

=0.975 atm

=.98 atm

The names of the alkanes are all shown below;

An alkane is a hydrocarbon that contains only hydrogen and carbon in which all the carbon to carbon bonds are saturated.

The names of the alkanes are all shown below;

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Answer:

please give a photo of it

Answer:

i have no idea. let's say location because it has to be somewhere.

Explanation:

I

Answer:

60 mL

Explanation:

200 mL =  0.2 L

We know that:

Molarity  =  Moles / Liters

So:

4.20 M = moles / 0.2 L

moles = 4.20 x 0.2 = 0.84

Then:

14.0 M = 0.84 moles / Liters

Liters = 0.84 moles / 14.0 M = 0.06 L

Since they want the answer in mL, convert 0.06 to get 60 mL

Percentage volume is the ratio of the mass of solute to the volume of the solution. The 510 ml volume of butanol should be combined with 30.0 mL ethanol.

Volume percent is the percentage ratio of the volume of the solute to the volume of solution multiplied by 100. It is given as,

[tex]\rm Percent \; volume = \rm \dfrac{ \text{volume of solute}}{\text{volume of solution}}\times 100 \%[/tex]

Given,

Percent volume = 5.88%

Volume of solute = 30.0 mL

Substituting values in the equation above:

[tex]\begin{aligned} \rm Percent \; volume &= \rm \dfrac{ \text{volume of solute}}{\text{volume of solution}}\times 100 \%\\\\5.88 &=\rm \dfrac{30}{V} \times 100\%\\\\&= 510.20\end{aligned}[/tex]

Therefore, 510 ml is the volume of butanol that should be added to the solution.

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Answer:

d) basic ions contain some H+ ions got it right

Explanation:

i got it right

Answer:

I think that A or C is the correct answer

Answer:

HCl is a strong acid, HC2H2O2 is a weak acid.

Explanation:

strong acid: completely dissociates in water

weak acid: partially dissociates in water

Answer:

Mass of iron = 59.375 gm

Explanation:

Calories ( or joules) are added to the water by the hot steel so at the endpoint they are BOTH at 40 C

 The water gains:

     4.18  j/g-C  * 50 * (40-30 C) = 2090 j

The steel gave up 2090 j going from 120 to 40 C

2090 = .44 j/g-C  * m * (120-40)    solve fro m = 59.375 gm