What caused space technology to improve so quickly?
Answer:
“spinoff”
Explanation:
Here is just a sampling of the many “spinoff” technologies, as NASA refers to them, resulting from space research and development that we now use in everyday life.
I WILL DIE I HAVE A KNIFE IN MY HAND. ANSWER WITH EXPLANATION. If the sound is high pitched, then the wave's frequency would have a:
A.high frequency, short wavelength
B. high frequency, long wavelength
C. low frequency, long wavelength
D. low frequency, short wavelength
Answer:
A
Explanation:
High frequency, short wavelength
Use the drop-down menus after each statement to identify the dry climate region being described.
v climates feature hot summers and cold winters, dividing the climate into sharply contrasting
seasons.
v climates are characterized by very little rainfall, hot summers, and mild winters.
v climates have annual precipitation between 15 and 25 inches.
Semiarid climate regions have areas of grasslands, called
steppes.
Answer:
✔ semiarid
✔ desert
✔ semiarid
✔ steppes
.
Explanation:
The deserts and steppes comprise the regions that are characterized by dry climates. The dry climates are characterized by very little rainfall, hot summers, and mild winters. The correct option is B.
What is a dry climate?The areas which are very dry and where the water escapes and leaves the area drier than other places is known as the dry climate. Most dry climates have summers very hot, winters cool and warm and the air is very dry.
The main characteristic feature of the dry climate is the low and infrequent rainfall. Arid and semi desert areas have only about 35 cm rainfall per year.
Thus the correct option is B.
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In this reaction, how does the rate of forward reaction vary with the concentration of the product?
2H2S(g) ⇌ 2H2(g) + S2(g)
It increases with an increase in the concentration of S2(g).
It decreases with a decrease in the concentration of H2(g).
It increases with a decrease in the concentration of H2(g).
It decreases with an increase in the concentration of S2(g).
It decreases with increase in the concentration of H2(g).
Answer:
c d e
Explanation:
Answer:
C D E
Explanation:
#platogang
As shown by the periodic table, why do the elements potassium and sodium have similar chemical properties?
Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life periods
The number of hours required : 37.2 hours
Further explanationGiven
⁴²K (potassium -42)
Required
The number of hours
Solution
The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually, radioactive elements have an unstable atomic nucleus.
Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours
For three half-life periods :
[tex]\tt 3\times 12.4=37.2~hours[/tex]
PLEASE HELP !!
Use the diagram below to answer the following questions.
PLEASE HELP
E TE
Figure B
In Figure B, which region contains the noble gas family of elements?
ОА
OD
ОС
OB
Noble gas located in the region D
Further explanationNoble gas are located in group 18 in the periodic table consisting of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), have a stable electron configuration where the valence electrons are 8(full outer shell of electrons), so it is very hard to react because of its stability
If we look at the periodic system of the elements, the noble gases are on the far right, so that in Figure 8 it is located in area D
And the other region :
A : alkali elements(group 1),
B : alkaline earth elements(group 2)
C : halogen elements(group 17)
how many bonds can sodium form
it exists as atom or ion but not as sodium molecule. So there is no any sodium sodium bonding between two sodium atoms. Sodium combines with other element or group to form compounds of sodium like sodium chloride ,sodium carbonate ,sodium sulphate etc. Sodium has symbol Na and its atomic no. is 11 .
Answer:
[tex]\boxed{One\: Ionic\: Bond}[/tex]
Explanation:
For example, sodium, which is a metal, and chloride, a nonmetal, form an ionic bond to make NaCl.
Hope it helps!<3
An object is placed at 0 on a number line. It moves 3 units to the right, then 4 units to the left, and then 6 units to
the right. What is the displacement of the object?
1
5
7
13
Answer:
the answer will be five
Explanation:
i got this question on a test and i got it right
I was named after the man that developed the periodic table.
Einsteinium
Moscovium
Mendelevium
Lawrencium
Answer: Mendelevium
Explanation:
3. Which of the following is an example of a polyatomic ion?
a. NO
b. OP-
C. CI
d. Ca²+
Answer:D
Explanation:polyatomic means more then one and it have more then 1 positive ion
1. Suppose that there were two isotopes of Sodium.
28% of the naturally occurring sodium atoms had a
mass of 22, and 72% atoms had a mass of 23. What
would the average atomic weight of sodium be?
Answer: C. The university surveys 600 randomly selected students who attend the university. Correct
Explanation:
22.72 is the average atomic weight of sodium.
What are isotopes?Isotopes are different versions of a specific element.
1st isotopes of 22u = 28%
2nd isotopes of 23u = 72%
The average atomic weight of sodium be=
22 x 28 + 23 x72
=2272/100
=22.72
Hence, 22.72 is the average atomic weight of sodium.
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Which substance is correctly identified as a homogeneous or heterogeneous mixture?
A. salad -- heterogeneous
B. milk --- heterogeneous
C. river water --- homogeneous
D. beach sand --- homogeneous
Answer:
A
Explanation:
A salad with lettuce, cheese, seeds, tomatoes, broccoli, and other vegetables is an example of a heterogeneous mixture.
Milk is not mixed with anything so that is incorrect
River water is mixed in with dirt and minerals so this one is incorrect
Beach sand is incorrect because you can see colored particles.
Please help me!!!!!!!it is about elements on the periodic table. Please help!!!!!
Answer:
a\c enables the protons so therefore we duplicate the neutrons making for the first one 80 squared then subtracted by 201 and then do that for all
Displacement can be added to get the total
a) velocity
b) distance
c) speed
d) acceleration
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a. 5.14 * 10^24 molecules H2O
b. 2.86 * 10^23 molecules H2O
c. 6.02 * 10^23 molecules H2O
d. 5.14 * 10^23 molecules H2O
Answer:
[tex]\boxed {\boxed {\sf A. \ About \ 5.14 *10^{24} \ molecules \ H_2O}}[/tex]
Explanation:
To convert from moles to units, we must use Avogadro's Number: 6.022 * 10²³
This tells us the number of units (molecules of water in this problem) in 1 mole of a substance (water). We can use it as a ratio or fraction.
[tex]\frac{6.022 *10^{23} \ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
Now, we can multiply this fraction by the moles of water (8.54) given.
[tex]8.54 \ mol \ H_2O*\frac{6.022 *10^{23}\ molecules \ H_2O}{1 \ mol \ H_2 O}[/tex]
When we multiply, the moles of water will cancel out.
[tex]8.54 *\frac{6.022 \ molecules \ H_2O}{1 \ }[/tex]
Since the fraction has a 1 as a denominator, we can remove it. The problem will be a simple multiplication problem.
[tex]8.54*6.022 \ molecules \ H_2O[/tex]
[tex]5.142788*10^{24} \ molecules \ H_2O[/tex]
The original measurement of 8.54 has 3 significant figures (8, 5, and 4). Therefore, we must round our answer to 3 sig figs, which is the hundredth place in this case.
The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]5.14 *10^{24} \ molecules \ H_2 O[/tex]
There are about 5.14*10²⁴ molecules of water in 8.54 moles.
Answer:
5.14 x 10^24 molecules of H2O.
Explanation:
just took the test
Please help me choose the correct statement
14. HCOOH is an example of
A. alcohols.
B. aldehydes.
C. carboxylic acids.
D. ethers.
E. ketones.
Answer:
carboxylic acid is the answer
Explanation:
Plz mark brainliest
HELP IN 8TH GRADE ADV SCIENCE
Answer:
protons: 36
neutrons: 48
electrons: 36
Do I use molar mass when the problem gives me grams? (Yes or No), Right answer gets brainliest.
(Stoichiometry Review)
Answer:
yes
Explanation:
yes because the molar mass is an intensive property of the substance, that does not depend on the size of the sample. In the International System of Units (SI), the base unit of molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
Answer:
Yes, if your calculating from grams to moles.
separation methods for coconut oil and water
Answer:
[tex]\huge\mathtt{{\colorbox{silver}{ANSWER~~~↴}}}[/tex]
we use a separating funnel to separate oil from water , we are using funnel because both water and oil both are immiscible liquids.
the process of separation of oil from water is called filtration ✔️
no copied answer :)
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An element in group 3 that is a good conductor of electricity.
Answer:
Well for me I think
Explanation:
it's Aliminium
Answer:
Aluminum is good in heat and conductor
Genetics is the study of
What is the name given to the group 0 elements
Answer:
the noble gases
If 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L, the concentration of the resulting solution is A0.025 M B 0.050 M C 0.10 M D 0.50 M E 1.0 M M
Answer: The concentration of the resulting solution is 0.025 M
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated [tex]NaOH[/tex] solution = 1.0 M
[tex]V_1[/tex] = volume of concentrated [tex]NaOH[/tex] solution = 50 ml
[tex]M_2[/tex] = molarity of diluted [tex]NaOH[/tex] solution = ?
[tex]V_2[/tex] = volume of diluted [tex]NaOH[/tex] solution = 2.0 L = 2000 ml (1L=1000ml)
Putting in the values we get:
[tex]1.0\times 50=M_2\times 2000[/tex]
[tex]M_2=0.025M[/tex]
Therefore, concentration of the resulting solution is 0.025 M
The concentration of the resulting solution if 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L is 0.025M
HOW TO CALCULATE FINAL CONCENTRATION:
The concentration of a solution can be calculated by using the following formula:C1V1 = C2V2
Where;
C1 = initial concentration (M)C2 = final concentration (M)V1 = initial volume (L)V2 = final volume (L)According to this question;
C1 = 1.0MV1 = 50mLC2 = ?V2 = 2000mL = 2L1 × 50 = C2 × 200050 = 2000C2C2 = 50 ÷ 2000C2 = 0.025MTherefore, the concentration of the resulting solution if 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L is 0.025M.Learn more at: https://brainly.com/question/17329736?referrer=searchResults
How many atoms of the element with atomic number 11 are in the reactants of the given formula?
2 NaCl + H2SO4 → 2 HCl + Na2SO4
The number of Na atoms in the reactants = 2
Further explanationEvery chemical reaction involves compounds that can act as reactants or products
The reactants will react to produce products
The reactants are usually written on the left side of the reaction, while the products on the right side of the reaction
Reaction
2 NaCl + H₂SO₄ → 2 HCl + Na₂SO₄
The element with atomic number 11 = Na(Natrium)
The number of atoms of the element that reacts or is produced can be seen from the reaction coefficient and the number of atoms in the compound
Na in NaCl = 1 atom
From equation, cofficient for NaCl = 2, so number of atoms of Na=2 x 1 = 2
EXPLAIN What is one way that the thermal energy of a system can be changed?
Answer:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Explanation:
BTW I GOT THE ANSWER FROM KRISTINA
The thermal energy of a system is the amount of heat energy in it.
One way to change thermal energy is by alter the system by introducing a new object to the system.
The thermal energy of a system is calculated using:
[tex]E = \frac 12 mc\theta[/tex]
Assume the mass of the system remains unchanged.
When an object is introduced to the system, the thermal energy becomes:
[tex]E_2 = \frac 12 mc(\theta + \alpha)[/tex]
Where:
[tex]\alpha \ne 0[/tex] --- the temperature of the object.
Expand:
[tex]E_2 = \frac 12 mc(\theta) + \frac 12 mc (\alpha)[/tex]
Substitute: [tex]E = \frac 12 mc\theta[/tex]
[tex]E_2 = E + \frac 12 mc (\alpha)[/tex]
This means that the thermal energy of the system will change by the thermal energy of the object that is being introduced to the system.
Hence, one way the thermal energy can be changed is to introduce a new object (or matter).
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serup is which solution
Answer:
dilute solution . . . . . . .
Explanation:
. .
Answer:
dilute soloution
Explanation:
dilute soloution as it dissolves
An object has a density of 1.4 g/cm . It is slowly lowered into a graduated cylinder whose water level was 65 mL. When the object is completely submerged the water level rises to 90 mL. What is the mass of the object?
Answer:
Explanation:
Weight
A measure of the force of gravity on an object
Mass
The measurement of how much matter an object contains
Volume
The amount of space that matter occupies
Density
The physical property that relates the mass and volume of an object or material
Unlike weight, mass doesn't change with location, even when the force of gravity on an object changes
Why do scientists prefer to describe its matter by its mass rather than its weight?
International System of Units
What system of units do scientists use to measure the properties of matter?
Liter, milliliter, cubic centimeter
3 common units of volume
Volume= length•width•height
Volume formula
Sand and feathers have different densities
Why does a kg of sand take up much less space than a kg of feathers?
Density=mass/volume
Density formula
Objects with densities greater than water will sink and objects with densities less than water will float. The density of wood is less than water (1 g/cm3) and the density of iron is greater than water (1 g/cm3)
If you drop a block of iron and block of wood into water, the iron sinks and the wood floats. What can you conclude about the density of iron and wood compared to the density of water?
V=2,400 cm3
A box has a length of 25 cm, a width of 8 cm, and a height of 12 cm. What is its volume?
D= 13.5 g/cm3
A sample of metal has a mass of 94.5 g and a volume of 7 cm3. What is its density?
Mass= density•volume
Mass formula
M= 234.26 g
Corn oil has a density of 6.89 g/cm3. What is the mass of 34.0 cm3 of corn oil?
Yes. No. The pull of gravity is different on the moon.
A solid has a mass of 180. Would the solid have a mass of 180 g on the moon? Would it have the same weight on Earth as on the moon? Explain.
No, because only the mass and volume will change
Will every solid with the same dimensions have the same density?
Grams and kilograms
Common units for mass
Grams per cubic centimeter or grams per cubic milliliter
Common units for density
V= 20 ml
D= 0.75 g/cm3
George put 25 ml of water into a graduated cylinder. After adding a solid object, the water level in the cylinder rose to 45 ml. What is the volume of the object? The object George is examining has a mass of 15 grams. What is the density of the object?
The nervous system involves actions that control
Answer:
The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.
Explanation:
mark as brainly plz and thanks
Answer: voluntary actions.
Explanation:The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.