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2 years ago

Physical Science pre-Test 2020-2021

Chemistry

1 answer:

poizon [28]2 years ago

4 0

Answer:

exothermic I think

Explanation:

IM TWKIGN THE TEST

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How do producers and consumers get energy from the sun?

Marysya12 [62]

Answer: In photosynthesis, producers combine carbon dioxide, water, and sunlight to produce oxygen and sugar (their food). Other organisms get energy by eating producers. ... It cannot directly use the Sun's energy to make food. As a consumer, it has to eat— or, consume— other organisms for energy.

Explanation: Thats how both producers and consumers get energy

6 0

3 years ago

7. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density

BaLLatris [955]

Answer:

$d=1.6\ g/cm^3$

Explanation:

Given that,

The dimension of a square chunk of plastic is 5 cm × 5 cm × 5 cm

Mass, m = 200 g

We need to find its density

Density = mass/volume

It will form a cube. It volume = side³

So,

$d=\dfrac{200\ g}{5^3\ cm^3}\\\\d=1.6\ g/cm^3$

Hence density is $1.6\ g/cm^3$

5 0

3 years ago

Individual measurements introduce errors that may be large or small depending on the quality of the tools and processes used. Sc

kirill [66]

Answer:

B. accepted value x 0.1

Explanation:

in the equation provided

$Percentage Error=\frac{Error}{AcceptedValue} X100$

Maximum allowed value of percentage error = 10%

put this value in the equation in stead of percentage error we get,

$10 = \frac{error}{AcceptedValue} X100\\ \frac{10}{100} =\frac{error}{AcceptedValue}\\.1=\frac{error}{AcceptedValue}\\error = .1 X Accepted Value$

so maximum error = .1 x accepted value

10 % percentage error means the experimental value has 10 % error compared to accepted value.so error will be 10 % of the accepted value

or .1 times of accepted value

8 0

3 years ago

A block of metal has a volume of 14.0in3 and weighs 5.26lb .

natulia [17]

Mass of block, m = 5.26 lb
1 lb = 453.592 g
5.26 lb = 2385.896 g
V = 14 in3
1 in = 2.5 cm
1 in3 = 15.625 cm3
14 in3 = 218.75 cm3

Density = mass/volume
= 2358.896 / 218.75
= 10.783 g/cm3

6 0

3 years ago

Read 2 more answers

HELP!!!<br> OPTIONS:<br> gas,<br> liquid,<br> solid

erica [24]

Answer:

Melting: solid liquid, Freezing: liquid to solid, Evaporation: liquid to gas.

Explanation:

mark me the brainliest

3 0

3 years ago