HELP!!! only answer if you have an answer for it!!! (will give brainliest)

1) In the reaction 2H2 + O2 → __H2O, what coefficient should be placed in front of H2O to balance the reaction?
a) 1
b) 2
c) 3
d) 4

2) In the reaction 4Al+3O2→_Al2O3, what coefficient should be placed in front of the Al2 to balance the reaction?
a) 1
b) 2
c) 3
d) 4

3) How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
a) The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen or carbon.
b) Only the oxygen needs to be balanced. There are equal numbers of hydrogen and carbon.
c) The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
d) Each element needs to be balanced.

4)How does the law of conservation of mass apply to this reaction: Al + 3HCl → H2 + AlCl3?
a) Only the hydrogen needs to be balanced. There are equal numbers of aluminum and chlorine.
b) The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
c) Hydrogen and chlorine need to be balanced. There is an equal amount of aluminum on each side.
d) The equation needs to be balanced. There are fewer hydrogen atoms in the equation than aluminum or chlorine.

Answer:

1.They can move in a variety of ways, including walking, running, jumping, crawling, climbing, swimming, gliding, and flying.

2.Can breathe thanks to our respiratory system and lungs.

3.All animals eat other living things to obtain food. Carnivores consume other animals, whilst herbivores consume vegetation. As omnivores, or animals that consume both plants and other animals, humans are. Feeding on decomposing plants and animals are decomposers like fungus and earthworms.

4.36,2 trillion cell units. Although not the final figure, this is a pretty strong beginning.

Answer: Purple

Explanation:

Mixing the color blue and red make the color purple ( fact: purple is the least used color in country flags )

Answer:

i cant see its rlly pixelated

All light being the same whether it comes from the sun a light bulb or

anywhere is False.

This is a type of kinetic energy which makes light to be visible to the eyes.

There are different sources of light which include:

Light from bulbs and Sun involve photons being emitted at different

intensities which is why the light from both sources are different. The

Sun has more intensity and a different source than the Light bulb.

Read more about Light energy here https://brainly.com/question/8181719

It helps frame the idea that citizen ship requires being actively involved in civic life.

Answer:

It helps frame the idea that citizenship requires being actively involved in civic life.

Explanation: I took the test :)

Answer:

C

Explanation: The dust bowl killed many crops resulting to low nutrients

Answer:

since the movie was unlisted, i'm unable to provide you with a proper answer? sorry

Explanation:

1) Archaea / Bacteria

2)  Protists

3) Fungus

4) Plant

5) Animal

Let us go option by option :

1) Genes are located in chromosomes. TRUE

Chromosomes are in cell nucleus. A chromosome contains hundreds and thousands of genes. A normal have 23 pairs of chromosomes, and a total of 46.

2) Chromosomes are the in nucleus.

TRUE

Chromosome is structure found in nucleus of the cell. It is made up of protein and DNA.

3) A single Chromosome can contain hundreds of genes.

TRUE

single Chromosome can contain hundreds of tgenes.

4) All of the above

TRUE

As all the statements above are true. The correct option is 4.

Answer:

all of them are true

Explanation:

this is because chromosomes contain genetic materials and it is present in the nucleus.
Therefore, the correct option is 4) all of these are true

no problem

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

Answer: 66.66   /   66.67   /   66 2/3 hydrogen 33.33   /   33 1/3 oxogen

for question e

in grams of course

Answer:

The answer for this question depends on the type of meniscus in the cylinder. If it is an upright meniscus like in water, the reading should be taken at the bottom of the meniscus. However if it is an inverted meniscus like in mercury, the reading should be taken at the top of the meniscus.

Answer:

A: By melting

Explanation:

When calcium carbonate is heated it decomposes into calcium oxide and carbon dioxide.

Answer:

Global Tempurature is rising

Sea level is rising

Explanation:

This is evidence of climate change. Depending on where you live it could be different like in florida there was a drought.

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

They absorb nitrates from the soil into their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll. When a plant or animal dies, decomposers like fungi and bacteria turn the nitrogen back into ammonium so it can reenter the nitrogen cycle.

Answer
I'm Thinking it's the amount of force Applied to the Bicycle

Explanation:

For Example, Let's say I was Riding a Bicycle and I Applied Full force My Bicycle Would Probably slowdown in fact I know it would because I've Rode on a bicycle before and as soon as I applied force it slowed down A bit.

I Hope This Helped Have a Nice Day!

Answer:yes

Explanation:

Yea

I suppose the last option to be correct.

Answer:

The cell dividing rapidly and creating a cancerous tumor

Explanation:

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

Answer: nucleus  

Explanation:

Answer:

those are right

Explanation:

Answer:

There could be several possible reasons for a small gap between rails on a railway track, such as:

1. Expansion joints: Railways are designed to allow the tracks to expand and contract with changes in temperature. To accommodate this expansion, small gaps are left between the rail ends and filled with expansion joints or plates.

2. Wear and tear: Over time, the rails may experience wear and tear due to heavy loads, weather conditions, and other factors. As a result, small gaps can appear between the rails.

3. Maintenance: During maintenance activities, rail tracks may be adjusted or replaced, which could lead to small gaps between the rails.

4. Environmental factors: Environmental factors such as soil shifts, earthquakes or other natural disasters can also affect the alignment of the rails, leading to small gaps.

These are some of the possible reasons for a small gap between the rails on a railway track.

Answer:

The small gap left between the rails in a railway track is intentional and serves a specific purpose. This gap is known as the rail joint, and it allows for the expansion and contraction of the rails due to changes in temperature. When the temperature changes, the metal rails will expand or contract, and if they were joined together tightly, they could buckle or become deformed, which could be dangerous for trains passing over them. The rail joint allows the rails to move slightly and prevent damage to the track.

Additionally, the rail joint also allows for maintenance and repairs of the track. If there were no gap between the rails, it would be challenging to replace a damaged rail or perform routine maintenance, such as tightening bolts or lubricating joints. With the rail joint, maintenance personnel can easily access and work on the track.

Overall, the small gap left between the rails in a railway track is intentional and serves a crucial function in ensuring the safety and reliability of the track.

Answer:

Linear molecule with two domains

Explanation:

A molecule with two domains will have a total of one bonded atom and one lone pair on the central atom, or two bonded atoms and zero lone pairs on the central atom.

Answer:

Some ideas which could be causing it to malfunction is an increase in temperature of the titan.

What is Boiling point?

This is defined as the constant temperature at which a liquid starts changing into gas.

Liquid oxygen has a high boiling point which means the Titan will have to be hotter for it to vapourize. This may have led to an increase in the production of oxygen gas and reduction in liquid oxygen production.

Explanation:

you welcome

As the water level inside the reactor vessels went low enough to expose at least the top core regions, a chemical reaction between water and the metal cladding of the fuel rods in the reactor cores is most likely what produced the hydrogen gas.

The escaping hydrogen self ignited, resulting in an explosion and flames. The explosive mixture of hydrogen and oxygen that spontaneously ignited inside the HP feed pipes was what caused the initial explosions.

But, hydrogen has serious safety hazards of its own. It is very combustible and has an ignition energy 20 times lower than that of gasoline or natural gas. Cell phones have the ability to ignite it.

To know more about fuel rods visit:-

brainly.com/question/29824258

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To prepare 250 mL of a D10/NS solution using D10W and a vial of NaCl 4 mEq/mL, you would need 9.6 mL of NaCl. Normal saline (NS) contains 154 mEq/L of sodium chloride (NaCl). To prepare 250 mL of NS, you would need 250 mL * (154 mEq/L) = 38500 mEq of NaCl. Since the vial of NaCl contains 4 mEq/mL, you would need 38500 mEq / (4 mEq/mL) = 9625 mL = 9.6 mL of NaCl. So the correct answer is b. 9.6ml.