What happens to the matter and rock when it melts beneath earth surface? How does the melting process eventually lead to igneous rock forming ?

If the plants in yellow light grow faster during her experiment, Lana should repeat the experiment to confirm the result. Option D.

In science, hypotheses are tested using experiments. Two hypotheses are usually formed during the course of experimentation:

The null hypothesis is set up to either be accepted is found to be true or rejected if found to be false. The alternate hypothesis is just there for guidance.

Hypotheses being found not to be true does not always mean that the reverse will be true.

Thus, if a complete opposite is obtained during testing, the next thing would be to repeat the experiment in order to be double sure there was not a mistake.

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Answer:

32 C

Explanation:

The conversion formula is:

( TempF  -32 ) X 5/9

So:

(88.7 - 32) x 5/9

56.7 x 5/9  =  31.5C

Significant digits will make you round you answer off to 32 C

Your final answer may have no more significant figures to the right of the decimal than the LEAST number of significant figures in any number in the problem.  Part of your equation subtracts 32 that has no significant digits to the right of the decimal.

Based on weather data, climate is measured. Since patterns over a length of time must be noted, a general term of 30 years is selected to anticipate the climate of an area.

The study of climatic evolution is known as climatology. This branch of science aids with people's comprehension of the atmospheric factors that influence weather patterns and temperature variations throughout time.

Meteorology is the study of weather, and a meteorologist is someone who conducts meteorological research. The area of atmospheric sciences known as meteorology places a strong emphasis on forecasting the weather. Moreover, it incorporates atmospheric physics and chemistry.

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Answer:

h20+co2= hco3

Explanation:

so that is not a single bond so it in gread 11 so I don't study it

The Safety Data Sheet (SDS) for regular bleach can be obtained from the manufacturer or supplier of the specific brand or product. It contains important information regarding the hazardous properties, handling, storage, and emergency procedures related to the bleach.

An SDS typically includes details such as the product's chemical composition, physical and chemical properties, potential hazards to health and the environment, precautionary measures for safe handling and storage, first-aid procedures, and information about proper disposal. It also provides guidance on personal protective equipment (PPE) to be used when handling the product and steps to take in case of accidental release or exposure.

The SDS serves as a crucial resource for understanding the potential risks associated with the use of regular bleach and helps ensure that appropriate safety measures are implemented. It is important to review and follow the information provided in the SDS to minimize the risk of accidents, injuries, or adverse health effects associated with the use of the product.

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The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

The law of conservation of mass states that in a chemical reaction the mass neither be created nor be destroyed.

for example :

CH₄   +    2O₂    ----->    CO₂   +   2H₂O

the mass of reactants is = 16 g + 64 g = 80 g

the mass of products is = 44 g + 36 g = 80 g

it is clear from the above that :

The mass of reactants = The mass of Products

Thus , The sentence best summarizes the law of conservation of mass is a) The total amount of mass does not change during a chemical reaction.

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A student was required to carry out an experiment in the lab to determine the enthalpy of solution of ammonium nitrate. A polystyrene cup was used because polystyrene is a heat insulator that would prevent heat loss to the surroundings. In that way, we can assume that heat loss is negligible in the endothermic reaction. The enthalpy of the solution is 29.6 kJ/mol.

A student was required to carry out an experiment in the lab to determine the enthalpy of solution of ammonium nitrate. The student was given a polystyrene cup, a measuring cylinder and a thermometer.

A. Why was a polystyrene cup and not a beaker used in the experiment?

Because polystyrene is a heat insulator that would prevent heat loss to the surroundings.

B. State one assumption that was made when performing the calculations for this reaction.

The heat loss to the surroundings is negligible.

C. Given that the initial temperature of the water was 27.3 °C and the final was 15.1 °C, state whether the reaction was endothermic or exothermic?

Since the final temperature was lower than the initial temperature, the reaction absorbed heat, which means it is endothermic.

D. Using the above information, calculate the enthalpy of the solution in kJ/mol when 16.0 g of ammonium nitrate dissolves in 100 cm³ of water. (Give answer to 3 significant figures)

The molar mass of ammonium nitrate is 80.04 g/mol. The moles corresponding to 16.0 g of ammonium nitrate are:

\(n = 16.0 g \times \frac{1mol}{80.04g} = 0.200 mol\)

We have 16.0 g of solute and 100 cm³ of water (100 g of water assuming density 1 g/cm³). The mass of the solution is:

\(m = 16.0 g + 100 g = 116 g\)

We can calculate the heat absorbed (Q) by the water using the following expression.

\(Q = c \times m \times \Delta T\)

where,

\(Q = \frac{4.184J}{g. \° C } \times 116 g \times (15.1 \° C - 27.3 \° C) \times \frac{1kJ}{1000J} = -5.92 kJ\)

According to the law of conservation of energy, the sum of the heat absorbed by the water (Qw) and the heat released by the solution (Qs) is zero.

\(Qw + Qs = 0\\Qs = -Qw = 5.92 kJ\)

Finally, we can calculate the enthalpy of the solution (ΔH) using the following expression.

\(\Delta H = \frac{Qs}{n} = \frac{5.92kJ}{0.200mol} = 29.6 kJ/mol\)

A student was required to carry out an experiment in the lab to determine the enthalpy of solution of ammonium nitrate. A polystyrene cup was used because polystyrene is a heat insulator that would prevent heat loss to the surroundings. In that way, we can assume that heat loss is negligible in the endothermic reaction. The enthalpy of the solution is 29.6 kJ/mol.

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Answer:

D. Phototropism

Explanation:

Plants, like every other living organism, responds to external stimulus. In this question, the stimulus is LIGHT from the sun entering through the window sill. The plant is responding positively to the light stimuli by growing towards the direction where the light is coming from. This exhibit is called PHOTOTROPISM.

Phototropism, comes from two words viz photo- meaning light and tropism- meaning movement. Hence, phototropism is the growth of an organism (plant in this case) in response to a light stimulus. The case described in this question is POSITIVE PHOTOTROPISM because the growth occurs towards the light source.

sure i can help

so u have to ask someone else

Answer: The calcium ion has a 2+ charge and the phosphate ion has a 3- charge.

Answer:

it would take 2 years

Explanation:

93/55=1.69--->1.70------>2

Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Answer:

True

Explanation:

The valence orbitals of boron are 2s2 2p1. We have to recall that all the valence orbitals whether full or empty are involved in the formation of molecular orbitals.

The number of molecular orbitals formed is equal to the number of atomic orbitals that are combined.

Since there are two valence orbitals and there is only one p orbital among the valence orbitals, it is true that only one p orbital is needed to form molecular orbitals in boron.

Answer:

Metalloids are a group of their own because they can have properties of both metals and non-metals.

Explanation:

Answer:

Their characteristics and behavior on different temperatures.

Explanation:

Metalloids weren't considered as metals although they have similar characteristics because metalloids have non metal characteristics too.

some act as either metal or non metal when reacted with elements

Answer:

Joule - J

Explanation:

As energy is defined via work, the SI unit of energy is the same as the unit of work – the joule (J).

Answer:

5

Explanation:

1km = 1,000m

5km = 5,000m = 1 light

25/5 = 5

Answer:D. a mixture consisting of two elements​​

Explanation:

The material in the container is a mixture consisting of two compounds. Therefore, option B is correct.

A mixture is a combination of two or more substances that are physically combined but not chemically bonded. In a mixture, the individual components retain their own properties and can be separated using physical means.

Mixtures can exist in various forms, such as solid mixtures (e.g., a mixture of sand and salt), liquid mixtures (e.g., a mixture of oil and water), or gaseous mixtures (e.g., a mixture of nitrogen and oxygen in the air). There are two types of mixtures, homogenous and heterogenous.

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Answer:

Evaporation is very important in the cooling of surfaces. If we put a drop of methylated spirit on our hand the methylated spirit will soon evaporate and our hand feels cold. The molecules of methylated spirit get the energy they need from our hand, leaving the molecules of the hand with less energy and so colder.

The ethylated sprit starts to evaporate from our hand. Evaporation is an endothermic process thus, absorbs the heat energy from our hand make the surface cool.

An endothermic process is the one which absorbs energy from the surroundings to proceed. Thus, an endothermic process make the surroundings cool and make the reaction system hot.

The process which evolves heat energy is called an exothermic process. An exothermic reaction make the surroundings hot sometimes leads to explosion.

Evaporation is the process of conversion of a liquid substance into vapor form. This process needs energy to intake. Hence during evaporation, the heat energy is absorbed from the surroundings make there cool. This is just happening on our hand when sprit evaporates.

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Answer:

Valence electrons are the electrons in the outermost energy level of an atom — in the energy level that is farthest away from the nucleus. Being able to determine the number of valence electrons in a particular atom gives you a big clue as to how that atom will react.

Explanation:

The volume of copper (II) sulfate in a container is equivalent to 0.650L.

Volume is the three-dimensional measure of space that comprises a length, a width and a height. It is measured in units of cubic centimeters (cm³) in metric, cubic inches or cubic feet in English measurement.

According to this question, a container seems to have about 650 mL of copper(II) sulfate solution in volume. The volume can be converted to litres as follows:

1 millilitre = 0.001 litre

650 millilitres = 0.650 litres

Therefore, 0.650L is the volume of copper II sulfate in litres.

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Answer:

mass and the square of the magnitude of velocity.

Explanation:

Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

Answer:

A cold front is moving to the north and west before a warm front moves through.

Explanation:

The blue line indicated a cold front and the red line indicates a warm front. Both lines are moving up (north) and to the left (west) on the globe. Key words are north and west, which indicates the direction of which the fronts are moving even if it is unclear of which front is before the other.

Answer:

option B = 0.410 g

Explanation:

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Answer:

Your body releases heat. Your jacket helps your body preserve that heat by shielding the heat from going out in the cold.

In this first-order the decomposition reaction, the H2O2 concentration will drop from 6.80 M to 2 M in roughly 191.1 seconds.

The first-order rate equation can be used to calculate how long it will take for the hydrogen peroxide (H2O2) concentration to reach 2 M:

ln([H2O2]t/[H2O2]0) = -kt

Where:

The amount of H2O2 present at time t is known as [H2O2]t.H2O2 is initially present at a concentration of zero, and k is the rate constant.

To find t, we can rewrite the equation as follows:

t = -[ln([H2O2]t/[H2O2]0)] / k

Plugging in the given values:

[H2O2]t = 2 M

[H2O2]0 = 6.80 M

\(k = 6.40 \times 10^{(-3)} s^{(-1)\)

t = -[ln(2/6.80)] / (6.40 x 10^(-3))

Now, we can calculate the time:

t ≈ -[ln(0.2941)] / (6.40 x 10^(-3))

t ≈ -(−1.2231) / (6.40 x 10^(-3))

t ≈ 191.1 seconds

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Answer: The formula for nitrous acid is HNO2, not nitric acid (HNO3).

a. To find the number of moles of HNO2, we need to divide the number of atoms by Avogadro's number (6.022 x 10^23 atoms per mole):

moles = 8.8 x 10^22 atoms / 6.022 x 10^23 atoms/mol

moles = 0.146 mol HNO2

b. To find the mass of HNO2, we need to multiply the number of moles by the molar mass. The molar mass of HNO2 is:

1(1.008) + 1(14.01) + 2(15.99) = 63.01 g/mol

mass = 0.146 mol x 63.01 g/mol

mass = 9.20 g HNO2

Explanation: