Chemistry Middle School

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Answers

Answer 1

Answer:

B

Explanation:

KRN2OANDNAKKANSOEMWNENOWKANSJW No explaining needed lol

Answer 2

Answer:

I think B may be right answer

Related Questions

The accepted value for R is 0.08206 L·atm/K·mol or 8.314 L·kPa/K·mol, depending on the unit of pressure used. (Your answer may differ slightly due to rounding.)



How close was your calculation?

Answers

Answer:

09.Yl/K.2.Pa/La

Explanation:

(a) The ideal gas constant in Liters, atmosphere, per kelvin per mole is  0.08206 L·atm/K·mol .

(b) The ideal gas constant in Liters, kilopascal, per kelvin per mole is  8.314 L·kPa/K·mol

Ideal gas constant in L.atm/K.mol

The ideal gas constant in Liters, atmosphere, per kelvin per mole is determined as follows;

PV = nRT

R = PV/nT

At standard condition;

P = pressure = 1 atmV = Volume = 22.4 L n = 1 mole of gasT = temperature = 273 K

R = (1 x 22.4) / (273 x 1)

R = 0.08205 L·atm/K·mol

Ideal gas constant in L·kPa/K·mol,

R = PV/nT

At standard condition;

P = pressure = 101.325 kPaV = Volume = 22.4 L n = 1 mole of gasT = temperature = 273 K

R = (101.325 x 22.4) / (273 x 1)

R = 8.314 L·kPa/K·mol

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Which statement describes the moment magnitude scale?

It measures only small earthquakes.
It collects data using a seismograph.
It shows only the strength of seismic waves that were produced.
It determines the amount of damage caused by an earthquake.

Answers

Answer:

It shows only the strength of seismic waves that were produced.

Explanation:

Answer:

B).  It collects data using a seismograph.

Explanation:

I thought it was it was choice 3 as well but i took the quiz and it turns out to be B

An aluminum atom can lose 3 electrons in order to have a full outer energy level. What charge does the resulting aluminum ion have?

Answers

Answer:+3

Explanation: remember negative goes with positive and vise versa

Answer:
+3

Explanation:

A chemist mixed two substances together: a colorless liquid with a strong smell and a white solid with no smell. The substances’ repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right.

Is the ending substance the same substance as the colorless liquid? What happened to the atoms of the starting substances when the ending substances formed? Be sure to explain your answers to both of these questions.

Answers

Answer:

The ending substance is the same as the colorless liquid.

Explanation:

which molecules from food and air end up in the cells in the body? choose all the apply- NEED URGENT 10 points!

Answers

There is a detailed explanation. But you have not provided the options to choose and apply.
Hope this detailed explanation helps!

Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.

In every chemical reaction that produce energy,
react with
A. 1 glucose, 6 oxygen
B. 6 glucose, 6 oxygen
C. 1 glucose, 3 oxygen
D. 3 oxygen ,3 glucose

Answers

Answer:

D

Explanation:

Hope you get it right

I’m guessing it’s D hopefully it’s right

How is a Mixture different from a Compound
30 points

Answers

Answer:

A substance that is comprised of more than one kind of atom reinforced together. Blend: A mix of at least two components or mixes that have not responded to bond together; each part in the combination holds its own properties.

Explanation:

Compound: A substance that is made up of more than one type of atom bonded together.

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties

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help me on science

Answers

Think about what you do daily and answer the questions

What part do the stamen and the ovule play in plant reproduction?
Question 7 options:

The stamen is the female reproductive part of the plant and it produces pollen.

The stamen holds the ovule and stigma together and produces pollen for fertilization.

When the stamen receives pollen from the plant, it is able to produce seeds and fruit.

When the stamen produces pollen, the ovule receives pollen to produce seeds and fruit.

Answers

Answer:

D. When the stamen produces pollen, the ovule receives pollen to produce seeds and fruit.

Explanation:

The stamen is the male reproductive organ of a plant and the ovule is a female reproductive part of a plant. (So we can rule out the first answer choice because stamen is in male plants not female plants).

The stamen produces pollen which sticks to pollinators such as bees when they land on the male plant. (So we can rule out the third one because pollen is produced by stamen and not received).

When the pollinators travel to female plants, the pollen gets deposited into the ovule which then produces seeds and fruit. (So we can rule out the second one because pollen is transported from one plant to the other by pollinators, not by the plants themselves).

Hope this is correct and helps!

I would appreciate it if you could give brainliest :)

The flowering plants reproduce sexually through a process known as the pollination. When the stamen produces pollen, the ovule receives pollen to produce seeds and fruit. The correct option is D.

What is pollination?

The process of transfer of pollen grains from the male anther of a flower to the female stigma is defined as the pollination. It can occur either within a flower or between the flowers of the same plant or flowers of different plants.

The male sex organ of a flower is stamen and the female part is pistil. The anther of the stamen contains pollen which consist of the male gametes. The movement of pollen to the stigma causes reproduction.

The innermost part of a flower is called the carpel. It contains ovary where eggs or ovules are located. The pollen from anther enter the ovary and fertilize an ovule in order to develop a seed.

Thus the correct option is D.

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The force needed to make an object with a mass of 5kg accelerate at 10 m/sec2 = Question 5 options:
500 Newtons 50 Newtons
100 Newtons 10 Newtons

Answers

Explanation:

Here, mass = 5kg acceleration = 10m/s^2

according to the question ;F = m×a ( from 2nd law of motion)F = 5kg × 10m/s^2F = 50kgm/s^2 or NEWTON

SO THE FORCE NEEDED IS 50 NEWTON

I HOPE THAT THIS ANSWER HELPS YOU

I need help this is due tomorrow

Answers

Answer:

it's spring tide.

Explanation:

The smallest tidal ranges are less than 1 m (3 feet). The highest tides, called spring tides, are formed when the earth, sun and moon are lined up in a row. This happens every two weeks during a new moon or full moon. Smaller tides, called neap tides, are formed when the earth, sun and moon form a right angle.

Hope it will help :)❤

During which phase change will two grams of water

release 668 joules of heat energy?

A. melting

B.

freezing

C.

vaporization

D. condensation

Answers

D would be the best answer is this situation so yeah thank me later

During the phase change of 2 grams water to solid-state, there has been the release of energy, and the process will be freezing. Thus option B is correct.

The release of the amount of heat by the sample has been able to change the state of the matter from the loosely bounded to the combat state.

The melting has been the process of conversion of solid-state to a liquid state. In the process, there has been the absorption of the energy for the rupture of the bond.

The freezing has been the conversion of liquid state to solid-state. The process requires a little amount of energy for the conversion.

The vaporization requires the absorption of energy and converts the liquid state to the vapor state.

The condensation has been the process of conversion of the vapor to the gaseous state. The process releases energy in large amounts.

Thus, during the phase change of 2 grams water to solid-state, there has been the release of energy, and the process will be freezing. Thus option B is correct.

For more information about the phase change, refer to the link:

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One property of metalloids not shared with metals or nonmetals is that metalloids are _________.

Answers

Brittle and usually not malleable or ductile. They are composed of a sea of electrons. They conduct better than non metals , but worse than metals.

One property of metalloids not shared with metals or nonmetals is that

metalloids are they are shiny like metals and brittle like non-metals.

Metalloids are elements which have some intermediate similarities to

metals and non metals. They are neither good or bad conductors of heat

and electricity and they exist as solids at room temperature.

Examples of metalloids include boron. silicon, germanium etc and they are

brittle and shiny elements which gives them a distinctive physical

appearance.

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1. Which force below is an attractive force that pulls objects together?
inertia
friction
air resistance
gravity



Please help .

Answers

Fraction that’s my eheissooakiss
The answer is gravity. Gravity is a attractive force that holds the solar system together. Everything and everyone that has mass has gravity, however, only massive objects such as the sun and Earth have noticeable gravity.

Help please giving brainliest

Answers

Answer:

i think protons and neutrons

Explanation:

im not sure tho

Answer:

Atomic mass is calculated by adding the masses of protons and neutrons in a given atom of an element.

Explanation:

For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.

Atomic mass is (just slightly less than) the sum of the masses of protons and neutrons in a given atom of an element.

hope this helps and is correct! :)

Question 4 options:
_____________ use an element's symbol and show valence electrons

Answers

Answer:

Lewis dot symbol is the answer.

Notice the populations decrease as you go from the bottom of the food chain to the top. Why do you think this is so?

Answers

Exactly what the person above me said
Populations decrease at a higher level of the food chain because they require more energy from the other organisms

All moving objects have what kind of energy?

Answers

Answer:

Kinetic energy. All moving things have kinetic energy, even very large things like planets, and very small ones like atoms.

Internal energy. All objects have internal energy.

Elastic potential energy. Some objects can change shape reversibly. ...

Gravitational potential energy. ...

Electrical energy. ...

Magnetic energy. ...

Explanation:

Jaden has a mass of 45 kilograms on Earth. Jupiter has more gravity than the Earth. On Jupiter, Jaden's mass will be _____.

45 kilograms
more than 45 kilograms
less than 45 kilograms

Answers

Answer: 45

Explanation: The mass of the object remains same everywhere.It does not change in any of the location. Hence, Jaden's mass will be 45 kg on Jupiter.

Using the formula in the photo the Answer would be 113.7 kilograms

Carbon monoxide (CO) _____.

is an element
is made of two oxygen atoms and two carbon atoms
increases in volume when compressed
is a compound made of oxygen and carbon

Answers

Answer:

the last one

Explanation:

All of the other ones are false

Answer:

is a compound made of oxygen and carbon

Explanation:

Which of the following is a compound?
A Water
B Oxygen
C Chlorine
D Aluminum

Answers

Explanation:

A compound is made out of 2 or more elements.

Oxygen (O2), Chlorine (Cl2) and Aluminium (Al) are all elements.

Water (H2O) is made out of hydrogen and oxygen, therefore water is a compound. (A)

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A that is water.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Water is a compound among all the given options. Water exits in three states solid (ice), liquid (water) and vapour.

Therefore, the correct option is option A.

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The measurement of electrical power is called _____.

a. horsepower
b. light
c. watts
d. shock

Answers

Answer:

c. watts

Explanation:

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Answer:

watts

Explanation:

hope this helps !

~jolisaevita

At 1:00 P.M., the air temperature was 78°F, and air pressure was 30.0 inches of mercury with partly cloudy skies. By 4:00 P.M., the temperature dropped to 62°F, and the pressure dropped to 29.5 inches of mercury. Which best predicts the weather for later that afternoon? pls help im about to get killed by my teacher giving out brainiest to fastest answer THAT GOES WITH DA QUESTIONNN

Answers

The 4:00 time because later that afternoon would be later in the day
I suppose it would be rain shower :)

While traveling along a highway a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile’s acceleration?

Answers

Answer:

-0.75 [tex]m/s^{2}[/tex]

Explanation:

a = [tex]\frac{v2-v1}{t}[/tex] = [tex]\frac{15 m/s - 24m/s}{12s}[/tex] = -0.75 [tex]m/s^{2}[/tex]

Hope this helps!!

-0.75
Because (final velocity -initial velocity)/time

what is the texture of oxygen

Answers

Oxygen is colorless odorless and tasteless so it has no texture
there is no texture .

Please help me with this question!
Am I right?

Answers

You are right!! Good job!!!

science help please 20 points

Answers

Answer:

1. Earth

2. Sun

3. Sun

4. Earth

5. Earth

6.Sun

7. Earth

Explanation:

I'm a lil sus of 3 and 6 but I'm pretty sure it's right.

Earth sun sun earth sun earth sun sun

ehehe can someone help me answer plz Students collected weather data every two hours between 9 A.M. and 3 P.M., as shown in the table.

*picture*

Based on this data, what type of weather should the students predict for later in the afternoon?


windy with precipitation


calm with clearing skies


hot and dry


freezing rain and snow

Answers

Windy with precipitation because it shows that the wind speeds keep increasing
Windy with precipitation, the wind speeds are increasing.

If two objects have different temperatures, heat will flow from the warmer object to the cooler one until _________________________.
A. one reaches a temperature of zero
B. one runs out of energy
C. they reach the same or equal temperature
D. one is absorbed into the other

Answers

c , they reach the same or equal temperature z
C, the heat will flow to the cooler one until they reach equilibrium

Make a list of 7 observations about what happens in the night vs. day.

Answers

Answer:

At night animals like owls and bats will go out and hunt.

When its nighttime It will get cooler out because the sun is on the other side of the earth.

During the day most animals are awake.

Answer:

Night:

1. All the stars (except the Sun) are in the sky

2. The sky is usually black

3. It's usually colder at this time

Day:

4. The sky is usually blue in the morning

5. The clouds are only visible in the day

Both:

6. It can rain at either time

7. The sun and moon are both usually glowing

Explanation:

Other Questions
The graph shows the cost, C, of sending m text messages. What is the cost per message?A. $0.05 per message B. $0.25 per message C. $0.15 per message D. $0.10 per message Darron is taking college classes while in high school. The classes cost $200 plus $35 for every credit hour. y = total cost of classes x = credit hours taken Which equation matches this linear function? which of the following is found in a plant cell but not in an animal cell 1. Verify that the functionsatisfies the threehypotheses of Rolle'sTheorem on the giveninterval. Then find allnumbers c that satisfies theconclusion of Rolle'sThe orem.y=-x^3+ 4x^2 3 ; [0, 4] I am confused ;-; pls help At a certain distance from the center of the Earth, a 0.4-kg object has a weight of 2.0 N. (a) Find this distance. (b) If the object is released at this location and allowed to fall toward the Earth, what is its initial acceleration The Native American cultures shared which of the following characteristics with the Egyptians Many plants tend to wilt on a hot, sunny day. The most likely cause of this wilting is Why is it important to cooperate with other countries on environmental issues?a.Environmental issues are not always localized.b.Other countries have no environmental issues.c.Other countries have more environmental issues.d.None of the above A person is standing on a raft; theircombined mass is 233 kg. What is thevolume of water displaced by the raft?[?] m3Pwater = 1,000 kg/m3 Bo Karah can run a race in 4 hours 33 minutes if he runs at 7 m/s. How long will it take in hours and minutes ifhe runs at 11 m/s? Give your answer to the nearest minute. where will u end up if u take 3 right turns and one left tunr?? According to the graph, what condition is best for enzyme activity?O A. A temperature above 30CB. A temperature of 0CC. A temperature of 25CD. A temperature below 20C List five questions that you have about inauguration as it is taking place. Awnser pls......................................... 100 POINT GIVEAWAY!!! just answer this, who painted the mona lisa Please HELP (due after 20 mins)Order from least to greatest:-2, 3.5, 2.25, -3.5, 1 Rainer bought 1.5 pounds of lunch meat at the store for $10.98. What was the unit rate (price) of the lunch meat? here is 93 points but answer this please If x = 4, what is the value of x3 + x - 5? In the future, regular travel between the planets in our solar system will become possible.Suppose spacecraft can only travel along the following routes: Earth - Mercury, Pluto - Venus,Earth - Pluto, Pluto - Mercury, Mercury - Venus, Uranus - Neptune, Neptune - Saturn,Saturn - Jupiter, Jupiter - Mars, and Mars - Uranus. Can a traveler get from Earth to Mars?