Answer:
1.false
2.neutron
3.neutron
Answer:
1. false
2. zero
3. isotopes
hope it helps
If you mix sand and water in a container the sand will sink to the bottom. explain why
Answer:
Sand is heavier than water and cannot float in water, so it will sink to the bottom.
grass → rabbit → fox
Explain why energy is lost by the rabbits in the middle step of this food chain.
Answer:
It is used by the organism itself for respiration.
3. What of the following determines an atom's identity?
A. Protons
B. Neutrons
C. Electrons
D. Nucleus
Answer:
protons
Explanation:
the number of protons in a nucleus are equal to the number of atoms in an element.
Protons determines an atom's identity. Therefore, the correct option is option A among alt the options.
Three essential elements make up an atom: protons, neutrons, and electrons. The nucleus, or central portion of the atom, contains protons, which are positively charged particles. Along with protons, neutrons, which have no charge, are found in the nucleus. On the other hand, electrons are negatively charged particles that move in regions called energy levels or shells around the nucleus. An atom's atomic number and designation as an element are determined by the quantity of protons in it. The usual size of an atom is between 0.1 and 0.5 nanometers; one nanometer is equal to one billionth of a metre.
Therefore, the correct option is option A.
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what is combination reaction give two examples
Nitrogen oxide emissions combine with water vapor, producing nitric acid
a
Chemical Change
b
Physical Change
Answer:
chemical change
I hope it's helps you
Write electronic configuration of first 30 elements in their sub shell
Answer:
Helium (He) 1s2
Lithium (Li) [He] 2s1
Beryllium (Be) [He] 2s2
Boron (B) [He] 2s2 2p1
Explanation:
please mark me brainleast
ANSWER QUICK PLEASE!!!! 25 POINTS
Acrylonitrile and ethyl acetate have the same boiling point: 77.2ºC. In one to two sentences, explain what outcome you would expect if a mixture of these two substances were distilled.
The two substances can never be separated by distillation because distillation depends on difference in boiling point.
Distillation is a separation method that depends on difference in boiling point between two substances.
Usually, the substance having a lower boiling point is collected first as the temperature is gradually raised. The substance having a higher boiling point then follows.
However, since the two substances have the same boiling point, they can not be separated by distillation because they will be converted to vapor simultaneously thereby making separation impossible.
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give any two reasons that hydrogen is kept in group 1 in Modern Periodic Table
Answer:
Hydrogen is usually classified as a group 1 element since it has one valence electron, just like group 1 metals.
Explanation:
What is the density of an object that has a mass of 5.8g and a volume of 2.1 mL?
Answer:
[tex]\boxed {\boxed {\sf 2.8 \ g/mL}}[/tex]
Explanation:
Density is an object's mass per unit volume. The formula for calculating density is:
[tex]\rho= \frac{m}{v}[/tex]
The mass of the object is 5.8 grams and the volume is 2.1 milliliters.
m= 5.8 g v= 2.1 mLSubstitute the variables into the formula.
[tex]\rho = \frac{5.8 \ g}{2.1 \ mL}[/tex]
Divide.
[tex]\rho = 2.761904762 \ g/mL[/tex]
The original values of mass and volume (5.8 and 2.1) have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 7 in the tenth place up to an 8.
[tex]\rho \approx 2.8 \ g/mL[/tex]
The density of the object is approximately 2.8 grams per milliliter.
The number of bonds in nitrogen molecule is:
Answer:
3 is the answer.
Explanation:
Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
Answer:
3
Explanation:
What are the missing coefficients for the chemical equation
[ ] Ca + [ ] O2 → [ ] CaO
Answer:
[tex]{ \sf{[ 2] Ca_{(s)} + [1 ] O_{2(g)} → [ 2] CaO _{(s)}}}[/tex]
what happens to the food dye in hot water?
Answer:
The food coloring mixes through the hot water faster than it mixes with the cold water. The reason for this is because in hot water, the water molecules have more energy and are moving faster than the molecules of cold water. This makes it way more easier for the dye to get mixed throughout the hot water.
Explanation:
Cuales son los elementos (de la tabla periodica) que contienen los seres inertes (minerales)
Osea por ejemplo las piedras, el agua, la tierra, cuales son los elementos del universo que conforman cosas no-vivas?
Carbonic acid weathering limestone
a
Chemical Change
b
Physical Change
equal volumes, 50.0 ml of 0.54897 M solution of HCl and 0.9573 M NaOH solutions having an initial temperature of 18.5 degree Celsius react in a coffee cup calorimeter. The resultant solution records a temperature of 22.9 degree Celsius. since the solutions are mostly water, the solutions are assumed to have a density of 1.0g/ml and a specific heat of 4.184 j/g degree Celsius. The heat capacity of the calorimeter is 1.0*10^1 j/degree Celsius.
a) calculate the heat gained or released by the solution at a constant pressure in j.
b)calculate the q reaction in kj
c) which reagent is limiting
D) calculate delta Hrxn (kj/mol)
Answer:
a) calculate the heat gained or released by the solution at a constant pressure in j.
A hot chunk of metal at 120 degrees Celsius is put into water at 20 degrees Celsius.
What will happen to the temperatures of the materials?
A. metal and water will both end up at 140 °C
B. metal and water will both end up at 60 °C
C. metal temperature will decrease to 20 °C
D. water temperature will increase to 120 °C
i believe the answer is B: both wind up at 60°C
but it's also reasonable to assume, given enough time, they wind up at 20°C because the water would heat up to cool the metal then slowly release the heat to the air untill they both reach 20°C
if it were me I'd answer B, apologies if I'm wrong
Which variable do you change during an experiment? This is often associated with the IF part of the hypothesis.
Constant Variable
Control Variable
Independent Variable
Dependent Variable
d
Answer:
Independant variable
Explanation:
Say you were doing a lab, you wanted to know if fertilizer actually helped a plant grow. The growth of a plant, in this situation, depends on whether you use fertilizer or not. You are changing if you use it or not, so it is the independent variable.
How many moles of hydrogen are produced when 6.28 mol of oxygen form?
Answer:
3.14 is the answer
Explanation:
hope it may help you
what is the density of a rock that has a volume of 56 ml and a mass of 170 g?
Answer: The density of the rock is 3.03
Explanation:
Density formula:
P = mass/volume
= 170/56
= 3.03
Note: cannot measure density, so there is no sign beside it.
Would you categorize temperature as an Intensive or extensive property explain plz !!!
Extensive properties depend on the amount of matter in a sample, While Intensive properties do not depend on the amount of matter in a substance.
~Could someone plz help me? Giving brainliest
Answer:
its D
Explanation:
A and C are ruled out because an opnion of scientist doesnt make the a law and B is not always true
!!DUE TODAY, NEED HELP ASAP!!
A student measured the masses of some aluminum and copper cylinders of different volumes. The data is displayed below:
Aluminum: Copper:
Volume (mL)
Mass (g)
Volume (mL)
Mass (g)
3.7
9.99
1.8
16.02
6
16.2
2.3
20.47
8.5
22.99
3.5
31.15
10.74
29
4.2
37.38
15
40.5
5.8
51.62
On graph paper graph the data above on ONE graph. Use the graph paper so the longer side is your y-axis.
Use up the majority of the graph paper. Do not make a small graph!
Use a ruler/straight edge so you graph is neat.
You will need to plot the points for each substance and create a double line graph. When connecting your points for each substance, continue the lines past the plotted points.
Be sure to include a key to identify the substances.
Make your X-axis volume(mL) and your Y-axis mass(g)
Look at the numbers for both substances when creating your scales. You will most likely have a different scale for mass and volume. What is the lowest number? What is the highest number? What does it make sense to go by?
Calculate the density of each metal.
Aluminum:_________________________ Copper:________________________
What happens to the mass of the copper at the volume increases from 6 to 8mL?
Which sample is more dense? How does the graph show you this?
Answer: The data are not arranged in a useful pattern. I arranged them as best I could and made a graph in Excel for demonstration.
Explanation: The data are plotted with mass on the x axis and volume on the y. Add a key to identify the top line as CU and the bottom as Al.
The density of Cu is 8.9 g/ml and 2.70 for Al.
The mass of copper increases by 17.8 grams going from 6 to 8 ml. (8.9 g/ml)*(2 ml) = 17.8 grams.
Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.
Please help pleaseeeeee
Answer:
C
Explanation:
It can already be seperated because the mixture hasn't disolved into the water yet.
4. Complete the reaction : Copper Sulphate (Cuso.) + Iron (Fe)-> + Copper ( Cu) ,1. Zinc Sulphate ( ZnSO2) ,
2.Magnesium Sulphate (MgSO) 3. Ferrous Sulphate ( FeSOA),4. None of these
Copper Sulphate (CuSO₄) + Iron (Fe) → __Ferrous Sulphate ( FeSO₂)__ + Copper ( Cu)
Since we know the reactants and one of the products, we can work backward to discover what the other reactant may be.
As it is in the question, we can map the reactants and product:
Reactants Product
Copper Copper
Sulphate _____
Iron _____
This indicates that the product is a combination of Iron and Sulphate. Since Sulphate is of Valency two and Iron would want to match this valency, the likely product is Iron (II) Sulphate, commonly known as Ferrous Sulphate.
PLEASE HELP!!
___ are the most organized state of matter
a.) Solids
b.) liquids
c.) gases
Answer:
solids
Explanation:
liquids spill away and gases are well,,,gases
difference between Ammonia and ammonium..
plz do not scam
a current of 1.5 a is flowing through a 4 resistor.
Answer:
than what can i do lol
4. Which of the following are not able to
travel through empty space?
A. gamma rays
C. sound waves
B. ultraviolet waves
D. light waves
Answer:
C.Sound waves.
Hope it helps you.What is the control in the experiment?
Answer:
C. the amount of drug x given to mice
A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used to
separate the two liquids? (1 point)
heating the liquids and letting one boil away first
passing the liquids through a filter to collect one of them
collecting one of the liquids with a spoon
waiting for the two liquids to separate
Answer:
Heating the liquids and letting one boil away first :)
Explanation:
Heating the liquids and letting one boil away first will be used to separate the two liquids.
Two liquids that quickly form a solution when combined are called miscible liquids.To Separate them, The best decision from the option is to heat the liquids and let one boil away first.
This is a separating method or techniqe called Distillation where two miscible liquids example water and ethanol are separated by Distillation due to the difference in boiling point. The liquid with the lower boiling point boils first and evaporates or trapped in another tube flask while the other with higher boiling point remains .
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