Give the volume indicated. Be sure to include all significant figures.
Options:
3.22
3.2
3.3
3.35
___mL

Heat is released.

When a chemical change occurs, energy comes out of the atoms which causes heat.

Answer: Option (A) is the correct answer.

Explanation:

Chemical changes are defined as the change which tend to show difference in chemical composition of a substance.

For example, toxicity, reactivity, combustion etc are all chemical properties.

So, in the given situation formation of bubbles shows that a gas has been formed which is a chemical change.

A chemical change will always lead to the formation of a new compound and this change is irreversible in nature by any physical means.

On the other hand, a change which is unable to bring any difference in chemical composition of a substance is known as a physical change.

For example, change in shape, size, mass, volume etc are all physical properties.

Thus, we can conclude that a gas is formed is an indication that a chemical change has occurred.

Answer:

B is wrong

Explanation:

I took a test just now and got it wrong

The indicators of a chemical change are represented in this scenario is the formation of a gas.

A chemical change is a change in the substance's chemical properties and its physical properties. The chemical changes show that a chemical reaction occurred.

Thus, the correct option is C) formation of a gas.

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Answer:

Option =C each mouse in the study has brown ears.

Explanation:

Qualitative:

Qualitative properties are those that can be only observed but not measured in numerical values. These are observed through senses: touch, sight, smell, taste and hear.

For example:

Color, odor, brittleness, taste etc.

Quantitative:

Quantitative properties can be measured in numerical values.

For example:

Melting point, boiling point, conductivity, viscosity, density, hardness and solubility.

In short we can say that qualitative is a measure of quality while the quantitative is a measure of quantity.

Answer:

so measuring stuff is easier and simple

Explanation:

Answer:

If a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed.

If a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed.

Explanation:

So in shorter words its options 2 and 3

All four statements are appropriate hypotheses reflecting the distinctions between physical and chemical changes. Physical changes involve alterations in the state or form without changing the chemical identity, whereas chemical changes result in the creation of new substances.

When addressing the question regarding whether certain statements about physical and chemical changes are appropriate hypotheses, it's important to recognize that an appropriate hypothesis should be testable and based on scientific concepts. The statements provided can be evaluated based on our understanding of physical and chemical properties and changes.

These statements align with the fundamental distinctions between physical and chemical changes. A physical property change affects the form but not the chemical identity of a substance, whereas a chemical property change results in the formation of a new substance.

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Answer:

91.38 %

Explanation:

First we use the following formula to calculate the number of moles of HCl and NaOH contained in the solutions:

molar concentration = number of moles / solution volume

number of moles = molar concentration × solution volume

number of moles of HCl = 0.2050 × 100 = 20.5 mmoles

number of moles of NaOH = 0.1020 × 19.85 = 2.02 mmoles

reaction between NaOH and HCl:

NaOH + HCl → NaCl + H₂O

If 2.02 mmoles of NaOH were used for neutralization of HCl left from the reaction, which are 2.02 mmoles of HCl, it means that the HCl reacted with Mg(OH)₂:

20.5 - 2.02 = 18.48 mmoles of HCl

2 HCl + Mg(OH)₂ = MgCl₂ + 2 H₂O

From the chemical reaction we devise the following reasoning:

if       2 mmoles of HCl react with 1 mmole of Mg(OH)₂

then  18.48 mmoles HCl react with X mmoles of Mg(OH)₂

X = (18.48 × 1) / 2 = 9.24 mmoles of Mg(OH)₂

now the mass of Mg(OH)₂:

mass = number of moles × molecular weight

mass of Mg(OH)₂ = 9.24 × 58.3 = 538.7 mg = 0.5387 g

Now the percent by mass of magnesium hydroxide Mg(OH)₂ in the impure sample (purity):

purity = (mass of pure Mg(OH)₂ / mass of impure sample) × 100

purity = (0.5387 / 0.5895) × 100

purity = 91.38 %

To calculate the percent by mass of magnesium hydroxide in the sample, determine the number of moles, and multiply by 100 to get the percent.

To calculate the percent by mass of magnesium hydroxide in the sample, we need to determine the number of moles of HCl that reacted with the magnesium hydroxide. We can use the stoichiometry of the reaction to find the moles of magnesium hydroxide. Then, we can divide the mass of magnesium hydroxide by the mass of the sample and multiply by 100 to get the percent.

The balanced chemical equation for the reaction is:

Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(l)

Using the molar ratio from the balanced equation, we can calculate the number of moles of magnesium hydroxide:

2 moles of HCl react with 1 mole of Mg(OH)2

moles of Mg(OH)2 = moles of HCl * (1 mole of Mg(OH)2 / 2 moles of HCl)

Finally, we can calculate the percent by mass of magnesium hydroxide in the sample:

Percent by mass = (mass of magnesium hydroxide/mass of sample) * 100%

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Answer:

D. Using the new pesticide produces bigger tomatoes than using the

old pesticide.

Explanation:

This hypothesis is best to test for the effect of the new pesticide on the tomato plant.

A pesticide is chemical formulation used to kill pests of farm crops.

Pests prevents the healthy and proper growth of plants thereby resulting in poor yield on the farm.

For the farmer to ascertain the effect of the pesticide on his farm crop, he must compare the yield of his produce. Some tomato might grow well but would not bear good fruit. If the farmer focuses on the fruit produced, he would have derieved a good hypothesis in his experiment.

Answer:

D.

Explanation:

did test

Answer:

c-do background research.

Explanation:

The scientific methods exposes the way scientists carry out their investigation and how findings are reported and at times discarded. It is systematic way of studying perceived observations in the environment.

During the course of an investigation, scientists may seek to find out about the prevailing knowledge about a phenomena and the level of research that might have been done in that regard. It is proper for such a scientist to do a background research by searching for related journals and publications in that field.  

Answer:

Explanation:

The wavelenght of a electromagnetic radiation is related with it's energy.

The longer the wavelenght the lower the energy.

The ekectromagnetic radiation that have an energy larger than the visible light is Gamma Rays, x-rays and ultraviolet radition, so it have a shorter wavelenght.

And the Infrared Radiation has an energy smaller than the visible light, having a longer wavelenght.

According Gay-Lussac's law, if the temperature of has increases, the pressure of the gas increases.

Gay-Lussac's law states that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

When there is a constant volume, with increasing temperature, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.

Finally, if the temperature of has increases, the pressure of the gas increases.

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Gay-Lussac's law, or Amontons's law, explains that the pressure of a gas increases with its temperature if its volume remains constant. This is due to increased kinetic energy leading to stronger, more frequent collisions against container walls.

Gay-Lussac's law, also known as Amontons's law, asserts the relationship between pressure and temperature in a gas, holding volume constant.

If the temperature of a gas is increased, the pressure increases

as a result. This increase is due to the gas molecules having greater kinetic energy, leading to faster speeds and more forceful collisions against the container walls. These more frequent and powerful collisions raise the pressure.

Gay-Lussac's law, mathematically, can be written as P proportional to T or P = constant × T

, where P is pressure, T is temperature, and the gas volume is constant. Conversely, Charles's law explains that if we allow the volume to adjust (not held constant), the pressure may maintain constant even with increased temperature.

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Answer:

The answer to your question is: density = 7.92 g/ml

Explanation:

data

mass of iron = 28.5 g

volume of water = 45.5 ml

volume of the iron = 49.1 - 45.5 = 3.6 ml

Formula

density = mass / volume

density = 28.5 / 3.6 substitution

density = 7.92 g/ml

The density of iron is 7.92 g/mL.

To calculate the density of iron, we need to use the formula:

Density = Mass / Volume

Given that the mass of the iron shot is 28.5g, and the volume of water is the difference in the water level before and after adding the iron shot, which is (49.10 mL - 45.50 mL = 3.60 mL), we can substitute the values into the formula:

Density = 28.5g / 3.60 mL = 7.92 g/mL

Therefore, the density of iron is 7.92 g/mL.

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Answer:

Explanation:

Amino acids consist of an amine (-NH2) group and a carboxyl acid (-COOH) group. So they have elements such as Nitrogen (N), Hydrogen (H), Carbon (C) and Oxygen (O).

Amino acid composition:

The human body has 20 amino acids which are all important but there are only 9 that are essential for the human body.

Best of Luck!

D. Protons and neutrons.

Happy to help! Please mark as BRAINLIEST! Thanks

Answer:

protons and nuetrons

Explanation:

Answer:

C- smaller and contains most of the atom's mass.

Compared to the entire atom, the nucleus of the atom is:

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Answer:

Thermal Conductivity

Explanation:

The dependent variable is what is being measured in the experiment and it's affected by the independent variable. Thermal conductivity is the best answer, because you are trying to find out which wire is a better conductor of thermal conductivity. Basically, which one conducts more heat? The copper does, because when its put into the hot water it melted more of the wax than the steel wire did.

Answer: Thermal conductivity of wire

Explanation:

The hypothesis of the experiment is to find the thermal conductivity of the the wires. The independent variable in the experiment is the type of wire used.

There are two types of wire used in the experiment one is copper and other one is steel. Rest all the variables are control variable.

At the end of the experiment the thermal conductivity was determined. This is the dependent variable of the experiment.

Hence, the correct answer is option D

Answer:

independent variable is unpopped corn the dependent is al kinds of brands of popcorn.

Explanation:

Answer:

Explanation:

"Nathaniel's favorite food is microwave popcorn. He loves microwave popcorn so much he can't stand to see unpopped kernals in the bottom of the bag. Nathaniel thinks to himself when this happens, "Thos ...?"

The net force is the force that determines the direction of the object's movement based on the overall influence of all forces present.

Net force is the type of force that an object will move towards. When the net force is present, it indicates the overall force that influences the object's motion. For example, in a scenario where forces are equal but opposite, resulting in a balanced state, the net force is zero.

Answer:

15.35 g of (NH₄)₃PO₄

Explanation:

First we need to look at the chemical reaction:

3 NH₃ + H₃PO₄ → (NH₄)₃PO₄

Now we calculate the number of moles of ammonia (NH₃):

number of moles = mass / molecular wight

number of moles = 5.24 / 17 = 0.308 moles of NH₃

Now from the chemical reaction we devise the following reasoning:

if         3 moles of NH₃ are produce 1 mole of (NH₄)₃PO₄

then   0.308 moles of NH₃ are produce X moles of (NH₄)₃PO₄

X = (0.308 × 1) / 3 = 0.103 moles of (NH₄)₃PO₄

mass = number of moles × molecular wight

mass = 0.103 × 149 = 15.35 g of (NH₄)₃PO₄

Answer:

The answer to your question is:

a) The gold cube is larger.

b) lenght = 1.67 cm

Explanation:

Data

Platinum    density  21.45 g/cm3          100 gram cube

Gold           density  19.3 g/cm3            100 gram cube

Formula

            density = mass / volume

a) Calculate volume

            volume = mass / density

Platinum    volume = 100 / 21.45 = 4.66 cm3

Gold           volume = 100 / 19.3 = 5.18 cm3

b)  Volume = lenght³

    4.66 cm³ = lenght³

    lenght = ∛4.66

    lenght = 1.67 cm

A 100-gram cube of gold would be larger than a 100-gram cube of platinum because gold has a lower density than platinum. The length of each side of a 100-gram cube of platinum would be approximately 1.67 cm.

Answer:

a) Which is larger, a 100-gram cube of platinum or a 100-gram cube of gold?
The gold cube would be larger. This is because gold has a lower density than platinum, meaning that a certain mass of gold will occupy a larger volume than the same mass of platinum.

b) What is the length of each side of a 100 gram cube of platinum?
To answer this, you would first calculate the volume of the cube using the density and mass. The formula to do this is mass/density = volume. So, 100 grams / 21.45 g/cm³ = approximately 4.66 cm³. Now, because it is a cube and all sides are equal, take the cube root of this volume to get the length of each side. The cube root of 4.66 cm³ is about 1.67 cm. Thus, each side of the 100 gram platinum cube would be approximately 1.67 cm.

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Answer:no, i dont think so

Explanation: Solubility is the property of a solid, liquid or gaseous chemical substance called solute to dissolve in a solid, liquid or gaseous solvent. however it depends on the physical and chemical properties of the solute and solvent as well as on temperature, pressure and presence of other chemicals

sauce: wikipedia XD

Answer:

The volume of a salt crystal with the mentioned dimensions is V= 107.44 x 10^-8.

Explanation:

To solve this problem we multiply the length of the sides of the crystal. To calculate this product you have to calculate:

1) (5.44 x 2.5 x 9,9). and

2) (10^-2 x 10^-3 x 10^-3). Here we have the product of powers of equal base so we should sum the exponents.

⇒(10^-2 x 10^-3 x 10^-3) = 10^(-2 + -3 + -3) ⇒ (10^-2 x 10^-3 x 10^-3) = 10^-8.

Finally,

V= (5.44 x 10^-2)x (2.3 x 10^-3) x (7.9 x 10^-3) ⇒ V= 107.44 x 10^-8 m.

An IV of distilled (pure) water can be dangerous because it disrupts the body's osmotic balance, causing cells to swell and potentially burst due to water moving into them from the bloodstream, leading to cell damage or death. Additionally, it can dilute blood electrolytes, resulting in a life-threatening condition called hyponatremia, with symptoms like nausea, confusion, seizures, and even coma or death.

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Answer:

The Kelvin temperature scale reflects the relationship between temperature and average kinetic energy.

Explanation:

The Kelvin temperature of a substance is directly equal to the average kinetic energy of the particles of a substance.

Answer:

Is a direct relation among them

Explanation:

As you increase the kinetic energy of the molecules, the temperature will increase, if the molecules have more energy, will move faster.

Check the graphic.

When the particles absorb some energy from the surroundings, it will start to save it, until the element do not want to be in a compound or in a certain state of matter, it will be independent

Hope this info is useful.

Answer:

The answer to your question is below: 8 electron in its outer most shell.

Explanation:

Argon like noble gases are stable elements that means that they do not react with other elements. They have eight electrons in their outermost shell; Elements are stable when they reach 8 electronsin their outer most shell, some elements reach 8 electrons receiving from others (nonmetals) and others donate electrons ( metals).

Answer:

The pressure of air is 204848.75 pascal.

Explanation:

Given data:

Moles of air = 0.355 mole

Volume of air = 5.68 L

Temperature = 394 K

Solution:

We will solve this problem by using ideal gas equation i.e.

PV = nRT

R is the ideal gas constant = 0.0821 L. atm / mol.K

Now we will put the values in equation,

PV = nRT

P = nRT / V

P = (0.335 mol × 0.0821  L. atm / mol.K × 394 K ) / 5.68 L

P = 11.483 L . atm / 5.68 L

P = 2.0217 atm

Now we will convert the atm into pascal.

1 atm = 101325 pa

2.0217 × 101325 =  204848.75 pa

Answer:

The problem can be solved using Ideal gas Equation  

PV = nRT

P = Pressure in atm (can be converted to pascals)

V = Volume in Liters

N stands number of moles  

R is the gas constant 0.08206 L atm [tex]K^{-1} mol^{-1}[/tex]

T is the temperature in kelvin

[tex]$P=\frac{n R T}{V}=\frac{0.355 \mathrm{mol} \times 0.08206 \mathrm{LatmK}^{-1} \mathrm{mol}^{-1} \times 394 \mathrm{K}}{5.68 \mathrm{L}} $$P=2.021 \mathrm{atm} $[/tex]

We know 1 atm = 101.325 kilo pascals = 101325 pascals

[tex]$2.021 {atm} \times \frac{101325 \text { ascals }}{1 \text { atm }}=204750 \text { Pascals } $$=2.05 \times 10^{5} \text { Pascals (Answer) } $[/tex]

CORRECT Answer:

A molecule is sent through the plasmodesmata of a plant cell.

Explanation: K12 test.

I got it wrong because the other person who answered this question answered wrong so he/she made me get it wrong. :( :( :( :( :( :(

Multicellularity depends on intercellular communication. The membrane-lined channels known as plasmodesmata (PD) connect the cytoplasm of neighboring cells in plants, enabling direct molecular exchange. Thus, option A is correct.

When it comes to intercellular trafficking, communication, and signaling for plant development and defense.

These pathways, referred to as plasmodesmata, enable chemicals to move freely between cells, allowing plants to grow regularly and form tissues and organs.

Plasmodesmata—intercellular pores that connect adjacent plant cells and permit membrane and cytoplasmic continuity—are crucial.

Therefore, A molecule is sent through the plasmodesmata of a plant cell.

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Answer:

See below.

Explanation:

It becomes and ion  with 2 positive charges:

For example:   Mg - 2e --->  Mg2+.

Answer:

According to Mr. Newton, an object will only accelerate if there is “net force” acting upon it. A net force is the sum of all forces acting on an object. A net force is capable of accelerating a mass.

Explanation: