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4 years ago

The story of space exploration began with unmanned exploration, moved into a period of manned exploration, and now appears

Chemistry

2 answers:

shusha [124]4 years ago

7 0

appears to be moving back toward unmanned exploration in the form of deep-space satellite exploration.

katovenus [111]4 years ago

6 0

Answer:

appears to be moving back toward unmanned exploration in the form of deep-space satellite exploration.

Explanation:

NASA moved from unmanned probing of space in its initial stage of space exploration to manned space exploration and moon landing and now has gone back to unmanned exploration into deeper space. Deep space is not completely known yet, and the exploration take year and are probably very dangerous for manned exploration for now.

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How many grams of beryllium chloride will be consumed if 987.5 g of magnesium chloride is produced?

Savatey [412]

The number Beryllium chloride consumed is calculated as follows

write equation for reaction

that is BeCl2 + Mg -----> MgCl2 +Be

find the moles of MgCl2 produced

moles =mass/molar mass of MgCl2

= 987.5g/95 = 10.39 moles
by use of mole ratio between BeCl2 to Mgcl2 which 1:1 therefore the moles of BeCl2 is also 10.39moles

mass of BeCl2 = moles x molar mass

that is 10.39 x80 = 831.2

8 0

3 years ago

Which of the following compounds is likely to have a pH above 7?

Shkiper50 [21]

Answer:

koh

Explanation:

kOh has a ph level of 10.89

3 0

4 years ago

A 26-week-old baby was brought to the pediatric clinic because of increasing lethargy and cyanosis. The infant has been in good

Elena-2011 [213]

Answer:

what i think is that,hemoglobin is what makes the blood red and the methemoglobin is what

Explanation:

3 0

3 years ago

A home solar energy storage unit uses 4.75 ✕ 102 L of water for storing energy. On a sunny day, the water absorbed 2.75 ✕ 104 kJ

Sav [38]

Answer : The water's temperature change will be, $13.85^oC$

Explanation : Given,

Density of water = 0.998 g/mL

Volume of water = $4.75\times 10^2L=4.75\times 10^5mL$

(conversion used : 1 L = 1000 mL)

Specific heat of water = $4.184J/g^oC$

Heat absorbed = $2.75\times 10^4kJ=2.75\times 10^7J$

(conversion used : 1 kJ = 1000 J)

First we have to determine the mass of water.

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}$

$\text{Mass of water}=(0.998g/mL)\times (4.75\times 10^5mL)=474050g$

Now we have to calculate the change in temperature of water.

Formula used :

$Q=m\times C_w\times \Delta T$

where,

Q = heat absorbed by water

m = mass of water

$C_w$ = specific heat of water

$\Delta T$ = change in temperature

Now put all the given value in the above formula, we get:

$2.75\times 10^7J=474050g\times 4.184J/g^oC\times \Delta T$

$\Delta T=13.85^oC$

Therefore, the water's temperature change will be, $13.85^oC$

8 0

4 years ago

What the reaction rates chart means

Zina [86]

Reaction rates are usually expressed as the concentration of reactant consumed or the concentration of product formed per unit time. ... The graph shows the change in the number of A and B molecules in the reaction as a function of time over a 1 min period (bottom)

7 0

4 years ago