For a science project, Janet performs four experiments that are supposed to show a chemical reaction. She displays her results in a table. A 4-column table with 4 rows. The first column titled experiment has entries 1, 2, 3, 4. The second column titled substances has entries water + heat, vinegar + baking soda, cabbage juice + lemon juice, liquid A + liquid B. The third column titled evidence of reaction has entries gas formation, gas formation, color change, precipitate formation. The fourth column titled Chemical Reaction ? has entries yes, yes, yes, yes. In the column titled "Chemical reaction?,” which experiment’s data should be changed to "No”? Experiment 1 Experiment 2 Experiment 3 Experiment 4

Answers

Answer 1

Answer: D

Explanation:


Related Questions

True or False: The solute is ALWAYS a solid and the solvent is ALWAYS a liquid

Answers

Answer:

false

Explanation:

Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid or a solid. ... Note that in each case, the solute particles are uniformly distributed among the solvent particles.

How do ethical concerns affect scientific research? a. scientists should set aside ethical concerns when doing research. b, scitentists should not let their own ethics interfere with their research. c. scientists must not hurt people or animals d.scientists should not let other peoples' ethics limit their research.

Answers

Answer:

C

Explanation:

I think that this answer Is more personal but they should try to limite animal cruelty in their research.

Answer:

C

Explanation:

Using your knowledge of symbols, determine which compound listed must contain both copper and oxygen.

1. malachite, Cu 2CO 3(OH) 2
2. calcite, CaCO 3
3. glucose, C 6H 12O 6
4. chalcopyrite, CuFeS 2

Answers

Answer:

Malachite

Explanation:

Malachite is the only listed compound that must contain copper and oxygen.

Copper and oxygen are both elements found on the periodic table. They have the following symbols;

         Copper  = Cu

         Oxygen  = O

From the given choices, only option 1 has the symbol Cu and O.

So only malachite contains both copper and oxygen.

which statement is correct for all elements in the same group

They have the same number of electrons in the highest occupied energy level
They have the same chemical reactivity
They have the same number of occupied energy levels
They have the same number of neutrons

Answers

They have the same number of electrons in the highest occupied energy level. :)

A man was 200 meter away from work if it took him 133 seconds to get to work
What was his speed?


HELP MEHHHHH

Answers

It’s most likely 1.5307 because The equation for speed is distance divided by time which would mean equation is 200÷133 and the answer to that is 1.5307

Hope too late but knowing my timing I probably am

in what aspects is a metalliod similar to metals and similar to non metals​

Answers

Answer:

Explanation:Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.

Most of the energy absorbed by a plant is _____.

Answers

Answer:

sunlight

Explanation: i go to school

Answer:

light/sunlight

Explanation:

Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose, a type of sugar.

Hope this helped!

Examine the diagram of a cell.



Which organelle is marked with an X?

lysosome
nucleus
chloroplast
vacuole

Answers

Answer:

chloroplast

Explanation:

i took the test

Antioxidants are
oxidizing agents found in foods.
reducing agents found in foods.
fat-soluble.
water soluble.

Answers

Antioxidants are: reducing agents found in foods.
Antioxidants reduce the amount of Free Radicals in our body by stabilizing them or deactivating them.


How many total atoms found in 2AClCl3

Answers

Answer: 4 atoms.

Explanation:

Shameeka is studying for an exam. She took the notes below about calcium and chlorine, which are known to form ionic bonds. Calcium, which is a metal, donates 2 electrons to chlorine. The individual calcium atoms become ions with a negative 2 charge. The bond between calcium and chlorine makes the atoms stable. Calcium and chlorine attract each other. Which best describes Shameeka’s error? ive got 2 hours so you dont need to rush

Answers

Calcium has a charge of positive 2 not negative

Answer:

Calcium has a charge of positive 2 not negative

Explanation:

Through which of the following loose soil materials does water infiltrate fastest?
A. pebbles
B. sand
C. silt
D. clay

Answers

Explanation:

I think pebbles because the pebbles can be different sizes and have bigger gaps in between them so the water will go through quicker.

hope this helps srry if wrong

The answer is A) Pebbles

You are required to make 250 cm3 of a solution of
sodium hydroxide which has a concentration of
0.1 mol dm-3. What mass of sodium hydroxide would
you need to weigh out?
A 0.1 g
B 1.0 g
C 4.0 g
D 25.0 g​

Answers

Answer:

b) 1.0g

Explanation:

C=m

MV

where Cis concentration

m is mass of substance

M is molar mass

V is volume of substance

To find m

CMV=m

but M = 23+16+1

= 40

0.1×40×0.25=m

1.0=m

6. Which specific processes in the rock cycle occur beneath the Earth's surface?
Support your answer.

Answers

Answer:

Under the earth's surface, rocks melt, metamorphize, and crystalize.

Explanation:

Metamorphic and Igneous rocks are basically dependant on the heat/pressure of the environment under the surface :) Melting, metamorphosing and crystallization all occur under earth's surface.

The specific processes in the rock cycle that occur beneath the Earth surface are :

Melting crystallizationmetamorphization

Under the Earth surface the specific rock cycle processes that leads to the formation of the different types of rocks includes;  Melting, metamorphization and rock crystallization.

Metamorphic rocks are formed from other rocks ( sedimentary and igneous rocks)  due to the change in temperature and this process is metamorphization. while igneous rocks are formed from molten rocks caused by the melting process. Sedimentary rocks are formed by the deposition of sediments from weathering of existing rocks this is the  crystallization process.

Hence the specific process in the rock cycle that occur beneath the Earth's surface are : Melting, metamorphosing and crystallization.

Learn more : https://brainly.com/question/22340852

Can somebody please help with this question?

Answers

Most of the mass of an atom is located in the (nucleus), and most of the volume is taken up by the (electron clouds).

The ones in the parenthesis are your answers.

Hope this helps!

The acceleration due to gravity on Earth’s moon is about 1.6m/s2. An astronaut with full survival pack has a mass of 100kg. He lifts a large boulder (rock) having a mass of 50kg. Losing his balance, and letting go of the boulder, the explorer trips and falls off a ledge that is 2m above the moon’s surface. Assuming that both the astronaut and the rock are the same distance from the surface of the moon, which object will hit the ground first:the astronaut or the rock? Explain your answer.

Answers

Answer:

Astronaut

Explanation:

Astronaut.He is 100kgs

Shabnam put something in a vessel of water and heated it on a gas stove for 30 minutes. That thing looked the SAME even after 30 minutes of heating. What could she have put into the vessel? A) a steel spoon B) a wax candle C) a handful of sugar D) a piece of chocolate

Answers

Answer: She could have put a steel spoon into the vessel. The correct option is A.

Explanation:

When a candle wax is passed through heat, it is capable of melting within 10- 15 minutes of boiling. Therefore it is not capable of looking the same after 30 mins of heating.

When sugar is put into water it dissolves. When heated it has the ability to crystallize out after water is evaporated but doesn't retain its shape.

A piece of chocolate will melt the instance it comes in contact with any form of heat.

A steel spoon is an alloy metal which is not capable of melting by boiling in water for just 30 minutes. A steel is an alloy of Iron and carbon which melts when superheated at the temperature of 1510 degrees.

plzzzzzz help me ?????
8. Well-aerated soils have the _______________ smell of good soil.

Answers

Answer:

Pore spaces filled with water

There are 5.0g of I-131 left after 40 days. How many grams were in the original sample if the half-life is 8 days?

Answers

5.0=mo(1/2) ^ 5
5.0=mo (.031)
about 160/161.29

160 grams of I-131 were in the original sample if the half-life is 8 days.

What do you mean by half life?

In a chemical reaction, the time taken for the concentration of that substance to become half of its initial value is called half-life. This term is used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay .

The amount left N after n half lives of a radioactive element with original amount N₀ is given as:

N= N₀ (1/2)ⁿ

Given, half life of Iodine-131 is 8 days

n= 40/8= 5

5= N₀ (1/2)⁵

N= 32 * 5

= 160 grams

Hence, the original amount amount of  I-131 will be 160 grams.

To know more about half life, refer

https://brainly.com/question/1160651

#SPJ2

Earth's land areas, oceans and atmosphere maintain fairly constant average temperatures. What is the best explanation for these constant average temperatures? (8.10 A) Earth's Northern and Southern hemispheres have opposite seasons. Earth's Northern and Southern hemispheres have opposite seasons. Earth is tilted and rotates daily on its axis. Earth is tilted and rotates daily on its axis. The continuous motion of air and water distributes the sun's energy. The continuous motion of air and water distributes the sun's energy. Global weather systems generally move from west to east.

Answers

Answer:

The continuous motion of air and water distributes the sun's energy.

Explanation:

The continuous motion air and water helps to distribute the sun's energy throughout the earth, and thus maintain fairly constant average temperatures.

The equatorial regions of the earth receives more heat than regions of higher latitudes. By means of convection air currents, whereby hotter and lighter air from the equatorial regions is circulated for colder and denser air from the regions of higher latitudes, heat is distributed between these regions.

Also, the heat of surface waters at the equatorial regions is circulated in convection currents as seas and oceans move around, to other regions of the earth in order to maintain a fairly constant average temperature.

Answer:

the continuous motion of air and water distributes the suns energy.

Explanation:

When heated, calcium carbonate decomposes according to the equation given below:

CaCO3 --> CaO + CO2
If 3.0 moles of CaCO3 are decomposed, how many grams of CO2 will be produced?


44.0 g
88.0 g
132 g
3.00 g

Answers

Answer:

132g

Explanation:

The reaction equation is given as:

          CaCO₃  →  CaO  + CO₂

Given;

 Number of moles of CaCO₃  = 3 moles

Unknown:

Mass of CO₂ produced  = ?

Solution:

From the balanced reaction equation;

          1 mole of CaCO₃ will produce 1 mole of CO₂;

         3 mole of CaCO₃ will then produce 3 moles of CO₂

To find the mass of CO₂;

  Mass of CO₂ = number of moles x molar mass

      Molar mass of CO₂  = 12 + 2(16) = 44g/mol

 Mass of CO₂ = 3 x 44  = 132g

what color does red represent in the periodic table ​

Answers

Answer:

Gas

Explanation:

Legend primordial element element by radioactive decay Atomic number color: red=gas

Name:
R = 0.0821 Latm
PV = nRT
P1 V1\ n1 T1 =P2 V2/ n2 T2
1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature
of 28.5 °C?
2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has
cooled?

Answers

Answer:

1. V = 1.47L

Explanation:

1) Using PV = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latmk mol)

n = number of moles

T = temperature (K)

To get number of moles, we say mole = mass/molar mass

Molar Mass of C2H2 = 12(2) + 1(2)

= 24 + 2 = 26g/mol

mole = 3.86/26

mole = 0.148mol

T (K) = 28.5°C + 273.15

T(K) = 301.65K

PV = nRT

2.5 × V = 0.148 × 0.0821 × 301.65

2.5V = 3.665

V = 3.665/2.5

V = 1.466

V = 1.47L

R =

PV = nRT

P1 V1\ n1 T1 =P2 V2/ n2 T2

1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature

of 28.5 °C?

2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has

cooled?

ILL GIVE BRAINLIST Mrs. Kucalaba downloaded some science music from the Internet onto her iPhone. She listened to the science music while she was building a deck in her mom’s yard.


Which energy transformation explains how Mrs. Kucalaba was able to listen to music on her iPhone while building a deck in her mom’s yard?

Question 19 options:

Light energy was transformed to chemical energy


Chemical energy was transformed to sound energy


Sound energy was transformed to chemical energy


Chemical energy was transformed to heat energy

Answers

Chemical to sound, pls give brainliest!

Help me plzz I don’t get this question

Answers

Answer: this ones old do you still need help on this one?

Explanation:

what is Very small and located on ER or located
floating on its own in the cytoplasm, it is
responsible for making proteins for repair and
growth.

Answers

These are ribosomes definately

Which property of an atom or element will determine how it reacts with other elements or atoms?

O valence electrons
O protons
O neutrons
O electrons

Answers

Answer:

valence electrons

Explanation:

This is because the valence electrons determine if an atom of an element can bond with other elements.

What is the mass of 2.1 moles of Ca(OH)2?

Answers

74.093 grams!!!!!!!!!!!!!!!!!!!
74.093 grams is the answer for your question

A block of wood has the mass of 180 grams.it is 10 cm long,6 cm wide and 4 cm thick.what is it’s density?

Answers

Answer:

0.75 g/cm³

Explanation:

Given data:

Mass of wooden block =  180 g

Length of block = 10 cm

Width of block = 6 cm

Height or thickness = 4 cm

Density of block = ?

Solution:

Volume of block = height × length × width

Volume of block = 4 cm × 10 cm× 6 cm

Volume of block = 240 cm³

Density of block:

density = mass/ volume

d = 180 g/ 240 cm³

d = 0.75 g/cm³

plz help me its the last question
If an atom of Thulium, Tm, has a mass of 172 and ejects an alpha particle, what is the new mass and atomic number? What element does this atom belong to now?

Answers

Answer:

¹⁶⁸₇₉Au

Explanation:

The symbol of the atom is given as;

          ¹⁷²₈₁Tl

If undergoes a nuclear reaction and it ejects an alpha particle;

 An alpha particle is the same as an helium atom

      ¹⁷²₈₁Tl  →  ₂⁴H   +     ₐᵇK

K is the hypothetical symbol of the new atom

b is the new mass number

a is the new atomic number;

 Conserving mass number;

        172  = 4 + b

        b  = 172  - 4  = 168

Conserving atomic number;

        81  = 2 + a

        81 - 2  = a

         a  = 79

The new compound is gold with a symbol of;

       ¹⁶⁸₇₉Au

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