Combination (Synthesis) Reactions
pls help!

Answer:

12

Explanation:

2x6

Answer: 18 moles

Explanation:

 in order to find that u need to take the coefficents of each of the compounds.  that gives a ratio of 2:3.

now we find out how many each unit is: 2x = 12x = 6

now, we multiply it by 3 to find the number of moles of O23(6) = 18 mol O2.  

Answer: Disilicon hexabromide ( Si2Br6 )

Explanation: First name the prefix of the first element then the prefix of the second element and change bromine to -ide.

The chemical formula of the covalent compound with 2 silicon and 6 bromine atoms has been [tex]\rm \bold{Si_2Br_6}[/tex].

The chemical formula has been the representation of the chemical compound that has been consisting of the number of atoms of each element that are present in the compound.

The chemical formula has been written with the elemental symbol, having the number of atoms of each element in the subscript.

The given covalent compound has been consisted of:

2 Silicon atoms = [tex]\rm Si_2[/tex]

6 Bromine atoms = [tex]\rm Br_6[/tex]

The chemical formula of the compound has been = [tex]\rm Si_2Br_6[/tex].

The chemical formula of the covalent compound with 2 silicon and 6 bromine atoms has been [tex]\rm \bold{Si_2Br_6}[/tex].

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Answer: 5,242 J

Explanation:

Step by step:

The formula for this is Q=mcΔT

Find out your values and then plug-and-play.

Q= unknown (energy amt we need to find out)

m= 167g

c= 2.093 J/go°C

ΔT= -20.0° + 15° would give you  -5.0°

Plug into the equation for Q=(167g)(2.093 J/g°C)(15°C).

Solve and you get 5,242 J.

hope this helps!!

The heat required to change the temperature of 167 g of ice from -20.0 °C to -5.0 °C is approximately 5246.2 Joules.

To find the amount of heat required to change the temperature of an object, we use the formula:
q = mcΔT
where:
- q is the heat energy (in joules),
- m is the mass of the substance (in grams),
- c is the specific heat capacity of the substance (in J/g°C), and
- ΔT is the change in temperature (in °C).

Here, the mass of the ice (m) is 167 g, the specific heat capacity of ice (c) is 2.093 J/g°C, and the change in temperature (ΔT) is -5.0°C - (-20.0°C) = 15.0°C.

Substitute the values into the formula:
q = (167 g)(2.093 J/g°C)(15.0°C) = 5246.205 J
Therefore, the heat required is about 5246.2 Joules.

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Answer:

The valency is 1.

Explanation:

Answer & Explanation:

As the ball falls towards the ground, its gravitational potential energy is transformed into kinetic energy. The kinetic energy of an object is the energy it possesses due to its motion.

Answer:

all of em

Explanation:

Final answer:

When a fluid cools, the density increases as molecules move closer together due to a decrease in kinetic energy, causing the fluid to sink.

Explanation:

Density of the fluid increases as the temperature decreases and molecules move closer together due to a decrease in kinetic energy, causing the fluid to sink. This phenomenon is observed in various liquids, including water, where as the temperature drops, the density of the liquid increases.

Answer:

Ionic equations and net ionic equations are usually written only for reactions that occur in solution and are an attempt to show how the ions present are reacting. While ionic equations show all of the substances present in solution, a net ionic equation shows only those that are changed during the course of the reaction.

Explanation:

example: Mg + 2 HCl MgCl2 + H2

Determining if a rock is magnetic is an example of investigating an intensive property.

C. determining if a rock is magnetic

Explanation:

Intensive properties don't rely upon the measure of the substance present. A few instances of serious properties are shading, taste, and dissolving point. Partitioning one broad property by another broad property, by and large, gives a concentrated worth—for instance, mass (broad) isolated by volume (broad) gives thickness (escalated). The proportion between the two broad properties is a concentrated property. For instance, mass and volume are broad properties, however, their proportion (thickness) is a concentrated property of issue.

Intensive properties are independent of the amount of substance present. The example of investigating an intensive property given is 'determining if a rock is magnetic'. This is distinguished from extensive properties, like mass, length, and volume.

An intensive property is a property of a substance that does not depend on the amount of the substance present. They include properties like temperature, color, hardness, melting point, boiling point, pressure, molecular weight, and density. Among the examples provided, the one that involves an investigation of an intensive property is 'determining if a rock is magnetic'. Whether a rock is magnetic or not is independent of the amount of material you have.

This is contrasted with extensive properties, which do depend on the amount of the substance present. Examples of these would include mass, length, and volume—all options provided except determining if a rock is magnetic.

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Answer:

The mass of CH4 is 60, 29 grams.

Explanation:

We use the weight of the atoms C and H for calculate the molar mass:

Weight of CH4= weight C+ 4 x weight H= 12,01 g/mol +4 x 1,008g/mol=

Weight of CH4 =16, 042 g/mol

1molCH4-----16, 042grams

3,758 mol CH4--X= (3,758 mol CH4 x 16, 042 grams)/1 mol CH4=60,285836 grams

Answer:

radiation

Explanation:

Answer:

3, the mitochondria has a certain shape and number 3 has the same shape.

Explanation:

Answer: It is number 3

Explanation: I am doing the test right now

Have a good day/night! :)

The flow of ocean currents is most directly affected by winds, with the Coriolis Effect also playing a significant role. Other factors like seawater density, affected by temperature and salinity, as well as geographical features and the conservation of potential vorticity, also influence current patterns.

The factor that most directly affects the flow of ocean currents is the wind. Surface ocean currents are primarily driven by prevailing winds, which are influenced by global weather patterns and the Earth's rotation, an effect known as the Coriolis Effect. These currents are responsible for transporting heat from tropical regions towards higher latitudes and affect regional weather cycles.

Moreover, the density of seawater, determined by temperature and salinity, influences the movement of deep ocean currents, known as thermohaline circulation. Changes in the water's density, such as from melting ice caps and warming surface waters, can disrupt this circulation and impact climate and weather patterns globally, which is part of the larger Global Conveyor Belt system.

Another aspect is the geographical configuration of coastlines and the seafloor, which can lead to the creation of unique patterns such as gyres and eddies. These physical features can redirect the flow of currents and lead to the convergence or divergence of water masses.

Moreover, the vorticity of water, which is a measure of the local rotation at a certain point in the fluid, can influence ocean currents through mechanisms like the conservation of potential vorticity and the interplay with underwater landscapes.

Overall, while winds are the primary driver of surface currents, the interplay of multiple factors such as the Earth's rotation, temperature, salinity, geological features, and vorticity all contribute to the complex flow patterns of ocean currents.

The correct answer is B differences in temperature is the factor that MOST directly affects the flow of ocean currents.

The temperature variations are the most fundamental factor that sets the ocean in motion, creating density differences and driving the circulation patterns that we see as ocean currents.

The other option is incorrect:

Option A is wrong because Differences in pressure: While pressure differences can influence currents, they are often a result of temperature variations.

Option C is wrong because  Earth's revolution round the Sun: Earth's revolution does have some influence on tides and ocean movements, but its effect on overall current flow is less direct.

Option D is wrong because The Moon's revolution round Earth: the Moon's gravity plays a major role in tides, but its influence on overall current flow is less significant compared to temperature variations.

The complete question is

Which factor MOST directly affects the flow of ocean currents?

A) differences in pressure

B) differences in temperature

C) Earth's revolution round the Sun

D) The Moon's revolution round Earth

Answer:

D. Their speed

All forms of electromagnetic radiation, regardless of their differences in frequencies and wavelengths, share the common quality of having the same speed in a vacuum, which is approximately 3.00 x 10^8 meters per second.

All forms of electromagnetic radiation, regardless of their different frequencies or wavelengths, share one common quality: their speed in a vacuum. When traveling through a vacuum, all electromagnetic waves move at the constant speed of about 299,792 kilometres per second (or equivalently, about 186,282 miles p/s), commonly approximated as 3.00 x 10^8 meters per second. This trait applies to all kinds of electromagnetic radiation, including visible light, X-rays, microwaves, and radio waves.

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Answer:

binary fission

Explanation:

A. The kinetic energy of gas particles is higher in hot food than in cold food.

Explanation:

The smell of a hot food moves faster than the smell of a cold food because the kinetic energy of gas particles is higher in hot food than in cold food.

Let us establish that the smell of the food perceived are gases from the food.

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Final answer:

The smell of hot food moves faster than cold food because A. The kinetic energy of gas particles is higher in hot food than in cold food. As temperature increases, particles move faster, spreading the smell more quickly.

Explanation:

The smell of hot food moves faster than the smell of cold food because of the kinetic energy of gas particles. As the temperature of a substance increases, so does the kinetic energy of its particles. Higher kinetic energy results in particles moving faster, which facilitates quicker dispersion of the smell.

Therefore, the correct answer to this question is A. The kinetic energy of gas particles is higher in hot food than in cold food. The kinetic-molecular theory explains that an increase in temperature leads to a greater average kinetic energy of the particles. As a result, the particles in the gas move more rapidly and the scent of hot food diffuses more quickly than that of cold food.

Answer: Ba(CN)2 + (NH4)2SO4 => BaSO4 + 2 NH4CN

Explanation: The reaction will produce BaSO4 Barium sulfate and NH4CN Ammonium cyanide.

Answer:

It is less

Explanation:

At low temperatures and pressures, the volume of a real gas is generally smaller compared to the volume of an ideal gas under the same conditions.

This is due to the fact that real gases exhibit intermolecular interactions, such as attractive forces between the gas molecules. These interactions cause the gas particles to be closer together and occupy a smaller volume compared to an ideal gas, which assumes no intermolecular forces and occupies a larger volume.

At low temperatures, the kinetic energy of gas particles decreases, and the intermolecular forces become more significant. This leads to a reduction in the overall volume of the gas as the particles are more closely packed.

Therefore, at low temperatures and pressure, the volume of real gas is smaller than ideal gas.

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Answer: fastest through steel

Explanation:

Sound waves travel fastest through solids, basically the one with the most density.

So fastest through steel

Then Al

Then water

Then ethanol

Then air

Answer:

The electrochemical series is an arrangement of metals in such order that any metal in the list is displaced from its compounds by any metal above it, but displaces any metal below it. The higher up the list a metal is, the greater its activity. Knowing a metal’s placement on this chart can help you understand the activity of the metal, especially in regard to its ability to displace hydrogen in acids. Any items on the list far above hydrogen will do a good job at displacing it, those near it won’t do such a good job, and those below it won’t displace it from acids at all.

Explanation:

I got this answer straight from Penn foster.

Electrochemical series has been the arrangement of metals based on reactivity. It has been important in understanding the reactivity of metals.

Electrochemical series has been the arrangement of the metals in the order of decreasing order of the reactivity. The arrangement has been mediated in the metals arranged above are more reactive and able to displace the lower metals in the series.

The electrochemical series has been important for understanding metals as for the reaction, the compound formed and most reactive compound has been determined easily.

Thus, electrochemical series has been the arrangement of metals based on reactivity. It has been important in understanding the reactivity of metals.

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Answer:

The volumes of 1 mol of CO2 and 1 mol of N2, gases are the same.

Explanation:

1 mole of a gas occupy 22.4L at stp. This is true for all gases. So,

1mol of CO2 = 22.4L

1mole of N2 = 22.4L

From the above illustration, 1mole of CO2 and 1mole N2 have the same volume at stp

Answer: The volumes of 1 mol of CO2 and 1 mol of N, gases are the same.

Explanation:

Answer:

v = 10 cm³

Explanation:

Given data:

Mass of sample = 80 g

Density of sample = 8 g/cm³

Volume of sample = ?

Solution:

We will calculate the volume by rearranging the density formula,

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

d =m/v

d = density

m =mass

v = m/d

Now we will put the values in formula,

v = 80 g / 8 g/cm³

v = 10 cm³

Explanation:

Using the periodic table, to predict the chloride that is ionic or not, we should first understand how ionic compounds are formed.

Ionic compounds are formed between  a highly electronegative element and less electronegative one.

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Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined  Temperature decreases, molecular motion increases, volume decreases, and shape becomes less defined Temperature increases, molecular motion decreases, volume decreases, and shape becomes less defined Temperature decreases, molecular motion increases, volume increases, and shape becomes more defined

Answer:

Explanation:

Final answer:

When water vapor condenses into liquid water, A) Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined compared to the gas.

Explanation:

The correct statement to describe when a sample of water vapor condenses into liquid water is A) Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined. When water vapor cools down, the molecules lose kinetic energy and move less vigorously, which allows them to come closer together and form liquid water, a process known as condensation. This is also associated with a decrease in volume since the molecules are now more closely packed than they were in the gaseous state. Additionally, the shape becomes more defined because liquids have a definite volume but no definite shape, conforming to the shape of their container, unlike gases that fill the entire space available to them.

Hey There !:

Molar mass of H₂O = 18.01 g/mol

Therefore:

1 mol H₂O ----------------- 18.01 g/mol

9.00 moles ---------------- ( mass of H₂O )

mass of H₂O = 9.00 x 18.01 / 1

mass of H₂O = 162.09 / 1

mass of H₂O = 162.09 grams

I hope that it helps !

Answer:

One distinguishing feature between physical and chemical changes is that a physical change can be reverse or turn back to its original form, but chemical change cannot be return to its form because the material change.

Explanation:

Explanation:

In the given figure we need to find the total resistance and total voltage .

We know that :

So, in this circuit : R1=12 ohm

R2=8 ohm

R3=10 ohm

Ammeter reading = 10A

so, they are in series therefore ,

Total R = R1 + R2 +R3

R=12 +10+8=30 ohm

To find voltage we have : V=IR

                                          V =10 x 30=300Volts

Answer:

The total resistance in this circuit is 30 ohms.

The battery voltmeter should read 300 volts.

Explanation:

I got it right. hope this helps !! :DD

Explanation:

Energy

It is ability to do work .

There are so many forms of energy .

out of which mechanical energy is also one of the form .

Mechanical energy

It is the energy possessed by the body by virtue of its motion and state .

It is of two types :

Kinetic energy

It is the energy possessed by the body by virtue of its motion .

Its expression is :

K.E=1/2mv²

Here in above question it is given that :

mass = 2Kg

V=10m/sec

K.E will be = 1/2 x 2 x 10 x 10

K.E=100 J

Answer:

Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.

Explanation:

What is Crossing over?

How can crossing over lead to the expression of new traits?

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