Students set up an experiment to investigate whether or not a chemical
reaction has occurred when mixing an antacid tablet with water. The results
are listed in the table. Which is not evidence that a chemical reaction has
occurred? *
Answers
Answer:
open system
Explanation:
it needs to loose mass not gain mass
Related Questions
BRO THIS IS THE 3RD TIME IVE PUT THIS UP CAN SOMEONE HELP NO LINKS OR TROLLS
Answers
Answer:
1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)
Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+
(aq) + Cl- (aq)
Ag+ (aq) + Cl- (aq) -> AgCl (s)
2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)
3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3
(aq)
Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->
Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)
Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)
4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)
Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->
BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)
Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)
Explanation:
Sorry, I couldn't make the charges superscript. Don't know how.
On #2, no reaction occurs; everything stays aqueous.
What do the particles of water look like at A and B? A. B. C. D.
Answers
Answer:
Explanation:
Each particle, or corpuscle, of water is a regular icosahedron (20-sided geometrical solid). This is what water particles look like, according to Plato's description in the Timaeus. In the center is the water-particle Plato describes at 55b, with 6 scalene triangles making up each equilateral face of the icosahedron
1
Which of the following is a mixture?
A air
B copper
C oxygen
D steam
Answers
Answer:
A air
Explanation:
Air is a mixture but not compound. Its constituents can be separated. For example: oxygen, nitrogen etc. by physical process.
WILL DO ANY THING TO GET A HELPWhich type of wind occurs over a small area?
Question 3 options:
polar easterlies
the Coriolis effect
trade winds
sea breezes
Answers
Answer: Sea breezes
Explanation: Took the test
PLEASE HELP!!!! What is the molarity of a solution that contains 42.9g of calcium chloride in a 45.0L solution?
Answers
Hey I know this looks easy but
Can somebody plz help tell me where to put the organisms in the correct group (only if u know which ones) thanks :3
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD!
Answers
Answer:
Benthos: crabs, starfish, lobsters, stingrays,, algae
Plankton: diatom, tubeworms
Nekton: whales, sharks, turtles,
Explanation:
What is the change in energy of a gas at a pressure of 105 kPa, if 245 J of energy is added causing a change in volume from 25.3 L to 38.6 L?
Answers
Answer:
-1151.5 J
Explanation:
Given that:
The supplies energy = 245 L
The energy used in the expansion of gas = Pressure ×ΔV (change in volume)
At standard conditions;
Pressure = 105 × 10³ Pa
energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L
= 1396.5 J
Thus, the change in the energy of gas = 245 - 1396.5 J
= -1151.5 J
Hence, we can conclude that the gas has lost its own energy in the process of expansion.
Why is the death of a Star important for our life on Earth?
Answers
Explanation:
The reason why stars are so important is that they have helped humans navigate through Earth. When it was dark these stars would light up the sky giving people lightly. In addition, stars are very important because they make life on Earth. ... Earth would just be a rock with ice.
I NEED NOW PLEASE HELP How many grams of KF are need in order to produce 2.0 mol CaF?
Answers
how did the idea of triads influence the development of the periodic table , even though more than three elements share similar properties ?
A. It established element families
B. It established element groups numbered 1-18
C. It gave rise to the idea of the law of octave
D. It gave rise to the idea of periodicity
Answers
Johann Döbereiner identified triads of chemically related elements in 1829 and demonstrated how the properties of the middle element could be anticipated from the properties of the other two. Examples of such triads are lithium, sodium, and potassium.
How did the idea of triads influence the development of the periodic table?
Johann Dobereiner (1780–1849), a German scientist, organized diverse trios of three elements into triads in 1829.Lithium, sodium, and potassium made up one such trio.Triads were based on both chemical and physical characteristics. All known elements could fit on Mendeleev's periodic table, and it also made precise predictions about the presence and characteristics of yet-to-be-discovered elements. Mendeleev organized the elements in his first periodic table according to their masses and other chemical characteristics.Atoms' fundamental chemical structure was unknown at the time.Mendeleev increased the size of his periodic table to include every element at the time. The law of triads was discovered by German scientist Johann Döbereiner, who wrote: "If the elements with similar chemical properties are grouped in the groups of three, the atomic weight of the middle element will be deemed almost equivalent to the arithmetic mean of the two-terminal element's total." The arithmetic mean of the atomic masses of the first and third elements must be about equal to the atomic mass of the second element in order to form a Dobereiner trio.The atomic mass of nitrogen is equal to the arithmetic mean of the atomic masses of carbon and oxygen in this situation, which is 14.They so make up Dobereiner's trio.To learn more about periodic table refer
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Explain the role of a primary consumer and a secondary consumer in a food web.
Answers
Answer:
Explanation:
Secondary consumers are organisms that eat primary consumers for energy. Primary consumers are always herbivores, or organisms that only eat autotrophic plants.
Carnivores only eat other animals, and omnivores eat both plant and animal matter.
Where can most stars
be found in the H-R
diagram?
A. Main sequence
B. Supergiants
C. White Dwarfs
D. Red Giants
Answers
Answer:
main sequence
Explanation:
The main sequence is a band of stars which includes most of them like our sun
can anyone give me just the answers??
Answers
Answer:
11. Redox
12. Acid/Base
13. Precipitation
14. Combustion
15. Precipitation
explain how the alpha particle scattering experiment led to a change in the model of the atom from the plum pudding model?
Answers
Answer:
So originally, the plum pudding model by J.J Thomson is electrons (negatively charged) held in place by a proton (positively charged) cloud.
Alpha particles are positively charged made of 2 protons + 2 neutrons.
Rutherford's experiment where they beamed those positively charged alpha particles demonstrated that an atom was not a uniform cloud, instead the alpha particles that were deflected was the positively charged nucleus. The alpha particles would also pass through if it didn't hit the nucleus, or be slightly attracted to the negative charge on the electrons. But the overall idea is that Rutherford's experiment changed what the structure of the atom was by discovering that they have a positively charged nucleus due to the deflection of positively charged alpha particles.
water, soil, temperature, space
Answers
Answer:
wdym??
Explanation:
Answer:
wdym by water, soil, temperature, space?
How many grams of Mg would be needed to react with 6.0 moles HCl?
Answers
Answer:
72g
Explanation:
The balanced equation of the reaction between Magnesium (Mg) and hydrochloric acid (HCl):
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Based on this equation, 1 mole of Mg needs to react with 2 moles of HCl.
Hence, 6 moles of HCl will need to react with 6 × ½ = 3 moles of Mg.
Using the formula; mole = mass/molar mass
Molar mass of Mg = 24g/mol
3 = mass/24
mass = 72g.
A mass of 68.45 g of nickel (II) sulfate hydrate, NiSO4∙ nH2O, loses 28.40 g upon dehydration. What is the hydration number of this compound? (Find n.)
Answers
Answer:
n=4
Explanation:
n= (154.75×28.40)÷(68.45×18)
n=3.5
n=4(approximately)
Which gas variable has to do with the amount of collisions of gas particles has?
(I think it’s temperature but I’m not sure)
Pressure
Temperature
Amount
Volume
Answers
Derive Boyle's law.
i'll mark the brainliest for the answer
Answers
Answer:
According to Boyle's Law, an inverse relationship exists between pressure and volume. ... The relationship for Boyle's Law can be expressed as follows: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the values of the pressure and volume of the gas after change.
Hope that helps! :)
-Aphrodite
Explanation:
Which chemical reaction is the fastest?
A. Oven cleaner absorbs cooked grease overnight.
B. Cake rises as it cooks in the oven.
C. Drain cleaner fizzes up as it encounters blockages in a pipe.
D. Milk turns sour.
Answers
Answer:
C) drain cleaner fizzes up as it encounters blockages in a pipe
Explanation:
The image shows a diagram of a chloroplast, which captures light energy from thesun. In what type of cell would you expect to find these
organelles?
Answers
Answer: a plant cell
Explanation:
Gary wanted to find out if some food colourings contained a banned food dye.
He put a drop of each food colouring and the banned food dye onto some special paper.
He hung the paper in a beaker of water.
After 10 minutes, the banned food dye and some of the dyes from the food colourings had moved up the paper.
Gary’s results are shown below.
(a) Gary wrote the labels on the paper in pencil. Why should he not write them in ink?
Answers
Explanation:
njsnjsjiwnaibainaondodnodn9nsine8ni
A toy balloon is filled to 135 mL at a temperature of 22.5 °C (295.5 K). What temperature in Kelvin does it need to be heated to expand to 250 mL?
Answers
Answer:
T2 = 547.2K
Explanation:
Given:
V1 = 135 ml. V2 = 250 ml
T1 = 295.5K. T2 = ?
Using Charles's law and solving for T2,
V1/T1 = V2/T2
T2 = (V2/V1)T1
= (250 ml/135 ml)(295.5K)
= 547.2K (or 273.2°C)
How much pressure (in atm) would be found in 5.8 moles of an ideal gas at 358 K and volume of 3.9 L?
Answers
Answer:
pressure=force / volume
5.8÷3.9
=1.5 ml
The saturation point for a solution is 25.0 grams of solute per 500 grams of solvent. If you pour 50.0 grams of solute into 800. grams of solvent, how many grams of
solute are in solution?
Plz help me!!
Answers
Answer:
I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.
An unknown substance has the chemical formula: Fez(C204)3 A molecule of the unknown substance contains A 3 fluorine atoms, 2 calcium atoms, and 4 oxygen atoms. 2 iron atoms, 6 carbon atoms, and 12 oxygen atoms. , 2 iron atoms, 2 carbon atoms, and 12 osmium atoms. 1 fluorine atom, 2 europium atoms, 8 copper atoms .
Answers
Answer:
Explanation: It is an ionic compound Fe2(C2O4)3
The compound with the formula Fe₂(C₂O₄)₃ contains two iron atoms, 6 carbon atoms and 12 oxygen atoms. Thus option C is correct.
What is chemical formula?Chemical formula of a compound or molecule represent the identity of the compound by representing which atoms are present in how many numbers.
Chemical formula is significant in representing a compound and distinguish it from other compounds.The number of each atom are given as subscripts for the symbol of each atoms.
If any group of atoms such SO₄ group or CO₃ group repeats in the compound put them in brackets and their number is given outside.The compound Fe₂(C₂O₄)₃ contains 2 iron atoms because Fe is the symbol of iron.
C₂O₄ is oxalate group and it is 3 in number. Two carbon and 4 oxygens are there in one oxalate group. Thus there are total 6 carbons and 12 oxygens in 3 oxalate groups. Hence option C is correct.
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. Water is one of our most important resources. Only about 1% of the Earth's water is for human needs. Name four ways you can help conserve water. This is for science btw...
Answers
Answer:please see explanation for answers
Explanation:
Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.
Now, some of the ways we can conserve water include
1. Putting off taps while lathering the hands with soap
2.use of irrigation system to water crops and plants
3.. while brushing, make sure to turn off the tap or faucet
4. use a shower rather than a bath
how many teaspoons of jelly would be required to use 36 slices of bread?
Answers
Answer:
depends on how much jelly u like
The reaction O3 + NO → O2 + NO2 has Ea = 10.7 kJ/mole and ΔH = – 199.8 kJ/mole. What is the activation energy for the following reaction?
O2 + NO2 → O3 + NO
Answers
Answer:
Ea = 210.5kJ/mole
Explanation:
When the reaction:
O3 + NO → O2 + NO2
Occurs, requires 10.7kJ/mole and releases -199.8kJ/mole.
For the forward reaction:
O2 + NO2 → O3 + NO
The Ea is the sum of Ea of the forward reaction and - ΔH, that is:
Ea = Ea - (-ΔH)
Ea = 10.7kJ/mol - (-199.8kJ/mol)
Ea = 210.5kJ/mole
3.00 L of a gas is collected at 35.0°C and 705.0 mmHg. What is the volume at STP?
Group of answer choices
2.55 L
1.65 L
2.47 L
3.10 L
Answers
Answer:
2.47L
Explanation:
Using the combined gas law equation as follows:
P1V1/T1= P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 705mmHg
P2 = 760mmHg (STP)
V1 = 3.00L
V2 = ?
T1 = 35°C = 35 + 273 = 308K
T2 = 273K (STP)
Using P1V1/T1= P2V2/T2
705 × 3/308 = 760 × V2/273
2115/308 = 760V2/273
Cross multiply
308 × 760V2 = 2115 × 273
234,080V2 = 577,395
V2 = 577,395 ÷ 234,080
V2 = 2.47L