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Answer:

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions. Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

Explanation:

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Answer: a double - replacement reaction

Explanation:

I just got it right on Apex

Answer:

the last one it increases number of collisions by speeding up the particle motion

Explanation:

the more thermal energy something it has the faster particles move

Answer:

nope homogeneous

Explanation:

hope this helps :)

Answer:

SOLUTIONS are homogeneous mixtures. A solution is a mixture of two or more substances in a single phase.

Answer:

1. gas

2. false

Explanation:

Answer:

Lead

Explanation:

As you move down the periodic table, the elements get larger and gain additional electron shells, increasing the radius.  In order, they are on the table as Chlorine, Selenium, Lead.

Answer: A

Explanation: 0.00624 x 10^8

All you have to do is move the . 8 units left

This gives you 624000.0

Answer:

15

Explanation:

Answer:

50 km/h

Explanation:

Since in half an hour it has gone 25km, double that (25 x 2) and you get your answer in km/h. Therefore, the train is going 50km/h.  

Option C - Electrons are outside the nucleus and and have a negative charge is the correct alternative.

We have electrons.

We have to determine their role inside the atom.

An electron is one of the subatomic particles within an atom. It is negatively charged particle whose magnitude is 1.6 x 10⁻¹⁹ C.

According to the question -

The role of electrons inside the atom is as follows -

Hence, Option C is the correct alternative.

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Answer:

From 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.

Explanation:

Given data:

Mass of H₂SO₄ = 4.9 g

Mass of K₂SO₄ formed = ?

Solution:

Chemical reaction:

H₂SO₄ + 2KOH    →    K₂SO₄ + 2H₂O

Number of moles of H₂SO₄:

Number of moles = mass/ molar mass

Number of moles = 4.9 g/ 98.1 g/mol

Number of moles = 0.05 mol

Now we will compare the moles of  H₂SO₄ with  K₂SO₄ .

                       H₂SO₄         :             K₂SO₄

                            1             :                  1

                       0.05           :             0.05

Mass of K₂SO₄:

Mass = number of moles × molar mass

Mass = 0.05 mol × 174.3 g/mol

Mass = 8.715 g

Thus, from 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.

Answer:

a molecule is defined as an element or compound consisting of two or more atoms held together by chemical bonds

i hope this helps :)

Explanation:

Answer:

opposite

Explanation:

Newtons law explains that for every action force there is an equal and opposite reaction.

Answer:

D.Magnesium

Explanation:

Cause imma nerd

Answer:

graduated cylinder and a scale can be used to measure the volume of a substance. hope this is helpful

Explanation:

Answer: A

Explanation:

Answer:

A.Seafloor spreading

Explanation:

Answer:

Through a series of chemical reactions and tectonic activity, carbon takes between 100-200 million years to move between rocks, soil, ocean, and atmosphere in the slow carbon cycle. ... The acid dissolves rocks—a process called chemical weathering—and releases calcium, magnesium, potassium, or sodium ions.

Answer:

Loses

Explanation:

liquid changes into solid, heat is released. The energy released upon freezing, known as the enthalpy of fusion, is a latent heat, and is exactly the same as the energy required to melt the same amount of the solid.

Answer:

Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings.

Explanation:

Answer:

Option C: Warm temperatures will replace cold temperatures.

Explanation:

In a weather map, a warm front is depicted with a red line and red semi circles while a cold front is depicted with a blue line and blue triangles.

Now, we are told that the map shows a blue line with triangles approaching a red line with semi-circles. This means that the cold front is approaching the warm front.

Now a warm front is simply defined as the transition zone where warm air mass gradually replaces a cold air.

Thus, it means the weather map depicts the fact that warm temperature is replacing cold temperature.

Thus; Option C is correct.

Answer: 1: A cold front moved into the area. 2: It would actually be A. A significant drop in temperature will occur across the area. 3: Movement of large air masses. 4: “A Strong Cold Front Threatens the Region”. 5: a meeting of two air masses with major differences in temperature and moisture.

Hope you got 100 because of this!

Answer:

Combustibility is a measure of how easily a substance bursts into flame, through fire or combustion. This is an important property to consider when a substance is used for construction or is being stored. It is also important in processes that produce combustible substances as by product

Answer:

Correct distribution of your weight and shifting of your center of gravity are crucial for the mantling technique to...

Bring your foot as high as you can, preferably planting down the heel.

Free up your arms so that you can rotate your hand and push down with your palm.

Remember to chalk up.

Answer:

+1 Because there are 82 protons.

Explanation:

Answer:

please upload a clearer picture

Answer:

1 Rain falling down

Answer:

It contains more water vapor than cold air

According to the process of conduction which take place from hot to cold end warm saturated air has more water vapor than cold air.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

As per the concept of conduction, warm hair has more water vapor than cold air, thus the correct option is that warm, saturated air has  more water vapor than cold air.

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Answer:

NaF

Explanation:

Answer: the answer is Naf

Explanation
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Answer:

C. Both 1 and 2 are correct.

The combination of beads should the student use for  the model :2 green, 3 blue and 12 yellow

In the chemical formula of a compound there are numbers:

1. The number indicates the number of atoms written after the element symbol

2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.

3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations

To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule

In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O

So the combination of beads

2 green(for Al), 3 blue(for S) and 12 yellow(for O)

Answer:

2 blue, 3 yellow, and 12 green

Explanation:

Answer:

the answer 32/43

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other, the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So,  

The direct rule of three is the rule applied in this case as follows: If the change in water level is 0.05 inches per hour, what is the change in water level after 24 hours?

change in water level=1.2 inches

To pass a decimal number to a fraction, you must:

Put the decimal number in a fraction above a 1. That is, the decimal number is the numerator, 1 the denominator.

Find an equivalent fraction. That fraction will carry in the denominator a 1, an

Finally, the change in the water level of the pond after 24 hours is 1.2 inches or what is the same  inches